6ES7157-0AG83-0XA0 - SIEMENS - Datasheet.Directory

Configuration for Communication

SIMATIC Field Automation with PROFIBUS in the

Process Industry

SIMATIC Field Automation

Foreword, Contents

Part 1: System Overview

Fundamentals 1

Components of Field Automation 2

SIMATIC Description of Components 3

Field Automation with Catalog Data 4

PROFIBUS in the

Process Industry

Part 2: Configuration

and Startup

System Overview Installation Guidelines 5

Hardware Configuration (example) 6

Software Configuration (example) 7

Appendices

References A

Glossary, Index

04/2005 Edition

SIMATIC Field Automation

Safety This manual contains instructions to be observed to ensure your personal

instructions safety and to avoid damage of property. The instructions are emphasized with a

warning triangle and are represented as follows, according to the degree of danger:

Danger

Failure to observe the appropriate precautions will result in death, serious injury or con-

siderable damage.

Warning

Failure to observe the appropriate precautions can result in death, serious injury or con-

siderable damage.

Caution

Failure to observe the appropriate precautions can result in slight injury or damage.

Note

This is important information relating to the product, handling of the product, or part of

the documentation to which particular attention must be paid.

Qualified Startup and operation of equipment may only be carried out by qualified

personnel personnel. In the context of the safety instructions of the manual, qualified

personnel are persons authorized to place the equipment, systems and circuits in opera-

tion according to the safety standards, to ground them and mark them.

Normal use Observe the following:

Warning

These products may only be used for the applications intended in the catalog and in the

technical description, and only in association with non-Siemens devices and compo-

nents recommended or approved by Siemens.

Perfect and reliable operation of the product requires proper transportation and storage,

setting up and installation as well as careful operation and maintenance.

Trademarks SIMATIC®, SITRANS® und SINEC® are registered trademarks of SIEMENS AG.

HART® is a registered trademark of the HART Communication Foundation.

Other designations in this publication may be trademarks whose utilization by third par-

ties for their own purposes may infringe the holders' rights.

SIMATIC Field Automation

Foreword

Purpose of this The first part of this system overview provides you with essential

system overview information about the versatile applications of PROFIBUS and SIMATIC

in the process industry. It presents SIMATIC PROFIBUS modules and net-

work structures that are suitable for the special communication tasks in the

process industry.

The second part presents you with information about the mechanical and elec-

trical structure and about the hardware and software configuration of the

PROFIBUS network.

The system overview is intended primarily for those who want to obtain a

quick overview of this complex subject or require a prompt answer to a spe-

cific question. It should, however, be remembered that the legal and standardi-

zation definitions are subject to continuous changes and adaptations to new

technologies. The information contained in this brochure therefore corresponds

to the state of the art at the time of publication

Required basic To understand the manual, you require general knowledge in the field of

knowledge automation technology. In addition, you should have some knowledge of

the STEP 7 and SIMATIC PDM basic software.

Scope This system overview includes the following systems and modules:

• PROFIBUS PA with the modules DP/PA link and DP/PA coupler.

• PROFIBUS DP RS485-IS with the system ET 200iSP and the

RS 485-IS coupler.

• HART Communication with the analog input and output modules of the

ET 200 M and ET 200iSP.

• SIMATIC PDM – the configuration and parameterization system for

PROFIBUS field devices and field devices with HART communication.

04.2005 Contents

SIMATIC Field Automation

Table of Contents

Part 1 System Overview

1 FUNDAMENTALS 1—1

1.1 PROFIBUS in the SIMATIC Automation System 1—2

1.2 PROFIBUS as the Universal Fieldbus 1—6

1.2.1 PROFIBUS DP 1—6

1.2.2 PROFIBUS PA 1—8

1.3 PROFIBUS Components 1—8

1.3.1 Transition from PROFIBUS DP to PROFIBUS PA 1—8

1.3.2 PROFIBUS PA configuration with SIMATIC S7 1—10

1.3.3 Transition from PROFIBUS DP RS485 to RS485-IS 1—11

1.3.4 Overview of PROFIBUS applications 1—13

1.4 HART Functions 1—14

1.5 Configuration of the PROFIBUS Network 1—14

2 FIELD AUTOMATION COMPONENTS 2–1

2.1 Introduction 2–2

2.2 Hardware Components 2–2

2.2.1 PROFIBUS PA 2–2

2.2.2 HART modules of the ET 200M 2–3

2.2.3 ET 200iSP 2–5

2.2.4 RS 485-IS coupler 2–7

2.3 Configuring the Field Systems 2–9

3 DESCRIPTION OF THE COMPONENTS 3–1

3.1 Hardware 3–2

3.1.1 DP/PA coupler 3–2

3.1.2 DP/PA link 3–3

3.1.3 HART modules of the ET 200M 3–4

3.1.3.1 Two-channel analog input module 3–4

3.1.4 ET 200iSP 3–5

3.1.5 RS 485-IS coupler 3–7

3.2 Software / Configuration 3–8

3.2.1 Configuration / quantity framework 3–8

3.2.2 Addressing of PROFIBUS PA field devices 3–9

3.2.3 Parameter assignment / device profiles 3–11

3.2.4 DMF and EDD descriptions 3–14

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SIMATIC Field Automation

3.2.5 Driver function blocks for field automation 3–15

4 CATALOG DATA 4–1

4.1 Ordering Data 4–2

4.2 Cross-References to Detailed Catalogs 4–2

4.3 Positioning in the Information Environment 4–3

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Fundamentals

This chapter contains:

1.1 PROFIBUS in the SIMATIC Automation System 1—2

1.2 PROFIBUS as the Universal Fieldbus 1—6

1.2.1 PROFIBUS DP 1—6

1.2.2 PROFIBUS PA 1—8

1.3 PROFIBUS Components 1—8

1.3.1 Transition from PROFIBUS DP to PROFIBUS PA 1—8

1.3.2 PROFIBUS PA configuration with SIMATIC S7 1—10

1.3.3 Transition from PROFIBUS DP RS485 to RS485-IS 1—11

1.3.4 Overview of PROFIBUS applications 1—13

1.4 HART Functions 1—14

1.5 Configuration of the PROFIBUS Network 1—14

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1.1 PROFIBUS in the SIMATIC Automation System

General The leading international fieldbus technology PROFIBUS is used in SIMATIC

systems as standard communication in order to permit an open and future-

oriented solution.

The PCS 7 system is given priority in this overview because the entire per-

formance range of the fieldbus components can be used conveniently in PCS 7.

SIMATIC PCS7 is the Siemens distributed control system (DCS) for the proc-

ess and manufacturing industries.

Components The SIMATIC family comprises the following main components

• PCS 7 process control system for DCS-based solutions

• SIMATIC S7 automation system for PLC/SCADA-based solutions in

connection with SIMATIC HMI

• SIMATIC HMI – the operator control and monitoring systems (such as

operator stations and operator terminals based on WinCC)

• SIMATIC NET – the communications basis comprising PROFIBUS and

PROFINET

• PROFIBUS DP – the fieldbus system for distributed IO based on ET200M

with S7-300 IO and PROFIBUS DP compatible field devices

• PROFIBUS PA – the expansion of the PROFIBUS DP fieldbus system to

include the optimized transmission system for the supply of process de-

vices via the bus.

• SIMATIC Industrial Software (e.g. engineering system STEP 7 with

SIMATIC Manager for SIMATIC S7 and PCS 7)

Requirements In order to use the field engineering package, at least the following releases

of the selected engineering software must be available:

Device /software package Software release

SIMATIC STEP7 from V 5.3 SP1

SIMATIC STEP7 and

SIMATIC PDM

STEP7 from V 5.3 SP1

PDM from V 5.2 SP1

PCS7 (contains STEP7 + PDM) from V 6.1

COM PROFIBUS and

SIMATIC PDM

COM PROFIBUS from V 5.0

PDM from V 5.2 SP1

Table 1-1: Basic requirements for the field engineering package

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Conformity Activities serving the interaction of components in the overall SIMATIC

system are available in various conformity classes. They offer different de-

grees of convenience and functionality in configuring and operation.

The control system functionality of the PCS 7 system with its special control-

related activities and tools for selected components offers a maximum of sys-

tem performance and convenience for the user.

Positioning in Field automation is positioned at the lowest level of the automation system.

the system

• PROFIBUS PA forms the communications channel between control level,

automation system and field device over great distances with minimum

overhead.

• HART modules provide the information channel for the HART protocol

between control level and field devices with HART protocol.

• SIMATIC PDM is a user-friendly configuring and parameter assignment

system for field devices with PROFIBUS PA connection or the HART

protocol.

Figures 1-1 and 1-2 show examples of the positioning within an automation

system.

Fig. 1-1 Positioning of the new field device systems in the IOs of the

SIMATIC automation system

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Fig. 1-2 Positioning of the PROFIBUS PA fieldbus system and HART I/O

modules in the SIMATIC S7/PCS 7 automation system

PROFIBUS PROFIBUS is a multi-master bus system. PROFIBUS is the field

bus intended for SIMATIC PCS 7 in medium-sized to large installations.

Up to 126 bus nodes can be connected to a PROFIBUS. It can operate at

transmission rates of 9.6 kbit/s to 12 Mbit/s and, if optical transmission tech-

nology is used, it can cover network ranges of up to 15 km at 1.5 Mbit/s.

PROFIBUS DP

The exchange of data between automation system and distributed I/O as well

as intelligent field devices is nowadays carried out via fieldbus systems with

low installation overhead. The standardized PROFIBUS DP is used for

SIMATIC S7 and PCS 7. PROFIBUS DP is a MASTER/SLAVE bus system.

The master function is performed by an automation system (master class 1) or

by one or more personal computers (master class 2). The automation system

(master class 1) has full access to the process signals of all bus nodes assigned

to it via cyclic message frames. By means of the personal computer (master

class 2), data can be exchanged as required with all connected bus nodes by

means of acyclic message frames for the configuration, commissioning, opera-

tion monitoring and maintenance. The distributed IO ET 200 and also individ-

ual field devices are connected via PROFIBUS DP. Depending on the stan-

dard, up to 126 bus nodes can also be connected to a PROFIBUS DP.

PROFIBUS can operate at transmission rates of 9.6 kbit/s to 12 Mbit/s and

can have a network size of up 15 km.

PROFIBUS DP is based on the international standards IEC 61158 and IEC

61784 and can be executed with the following transmission technologies:

RS485 Simple and cost-effective transmission technology on the ba-

sis of a shielded two-core cable.

RS485-IS Intrinsically safe electrical transmission technology with a

shielded two-wire cable and a transmission rate of 1.5 Mbit/s

for hazardous areas up to Zone 1 (gas) or Zone 21 (dust).

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FOC Optical transmission technology with glass or plastic fiber-

optic cables over distances of up to 15 km.

PROFIBUS PA PROFIBUS PA is the extension of PROFIBUS DP to include the optimized

transmission system for field devices while retaining the communications

function of PROFIBUS DP. With the selected transmission system, field de-

vices, even in hazardous areas, can be connected to the automation system

over great distances and powered via PROFIBUS PA. With a relatively low

transmission rate of 31.25 kbit/s, the typical communication time of a trans-

ducer is only about 10 ms. This enables practically all typical applications in

the process industry to be implemented with fast cycle times and in widely dis-

tributed systems. PROFIBUS PA is the communications-compatible extension

of PROFIBUS DP.

PROFIBUS PA

PROFIBUS DP communication

optimized transmission technology for field devices

HART - HART (highway addressable remote transducer) is a serial transmission

communication method, with which additional data such as measuring range, attenuation, etc.,

can be transmitted to connected sensors or actuators over a 4 mA to 20 mA

current loop. In the course of time, this technology has developed with the

support of the HART Communication Foundation (HCF) into a vendor-

independent standard. The HART field devices described with the standard-

ized electronic device description (EDD) are integrated into the SIMATIC

PDM engineering tool via the HCF catalog.

Utilization of the HART protocol becomes possible with the two HART ana-

log modules offered by SIEMENS. This extends considerably beyond the op-

tion of incorporating a handheld terminal in the current loop.

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1.2 PROFIBUS as the Universal Fieldbus

General PROFIBUS (Process Fieldbus) is a bus system standardized according to

the international standards IEC 61158 and IEC 61784 and has been used suc-

cessfully for several years in manufacturing and process automation (chemi-

cals and process engineering).

The possible applications of the fieldbus system are determined essentially by

the transmission technologies available. Apart from the general requirements,

such as high security of transmission, long range and distance and high trans-

mission speed, the operation in hazardous areas and the transmission of data

and energy through a shared cable must also be possible for use in process

automation. Several transmission methods are therefore available in the

PROFIBUS system:

• RS485 transmission for universal application in discrete industry

• RS485-IS transmission in hazardous areas

• MBP transmission for use in process automation

• Fiber optic cables for greater range and immunity to interference

The following sub-topics describe, in addition to the technical properties of

PROFIBUS PA, the integrating function of PROFIBUS PA in the automation

of chemical and process engineering processes. PROFIBUS PA is a communi-

cations-compatible extension of PROFIBUS DP into the field. Using the se-

lected MBP (Manchester Coded, Bus Powered) transmission technology,

transducers and actuators can communicate with the central programmable

controller and also be supplied by it, even in hazardous areas and over large

distances.

For more detailed information, please see the References in section 5.3.

Fig. 1-3 illustrates the integrated PROFIBUS system with its various transmis-

sion technologies.

Fiber: Glass Multi Mode

Optics: Glass Single Mode

PCF / Plastic Fiber

MBP: Manchester Bus Pwd

MBP-LP: Low Power

MBP-IS: Intrinsic safety

pplication

Profiles I

Communication

Technologies

Transmission

Technologies

RS485: NRZ

RS485-IS: Intrinsic safety

PROFIBUS DP

IEC 61158/61784

DP-

0...V2

Common Application Profiles (optional):

PROFIsafe, Time Stamp, Redundancy, etc.

Descriptions (DMF, EDD)

Tools

(

DTM

Confi

urators

)

Fig. 1-3 PROFIBUS system structure

1.2.1 PROFIBUS DP

Introduction PROFIBUS DP is the most widely used fieldbus system in the world.

The technical characteristics of PROFIBUS DP allow operation in almost all

areas of industrial automation. Notable features are, in addition to the simple

installation (two-wire cable), the extremely high transmission rate (up to

12 Mbit/s), the versatile network configurations (linear, star, ring) and optional

04.2005 1 Fundamentals

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redundancy with a fiber-optic double ring. PROFIBUS DP is a master/slave

bus system with which the master function is assumed by a programmable

controller (master class 1) or a personal computer (master class 2). Master

class 1, in which the automation functions (closed-loop and open-loop control)

also take place, has full access to the field devices via cyclic and acyclic mes-

sage frames. Master class 2 can, if required, exchange data via acyclic frames

with master class 1 (upload/download, read master diagnosis) and exchange

data with the field devices (read measured value, read slave diagnosis, write

parameters).

Technical data:

• Transmission system: RS485, RS485-IS, FOC (multimode or single-mode

glass fiber, PCF, plastic fiber)

• Topology: linear, star, ring

• Medium: twisted pair cable, FOC optional

• Number of bus nodes: max. 126 (max. 32 per segment)

• Number of segments: max. 10

• Network size: max. 2000 m at 1.5 Mbit/s with 9 repeaters (optically up to

15 km)

• Transmission rate: max. 12 Mbit/s

• Use in intrinsically safe area by means of RS485-IS transmission technol-

ogy

• Redundancy: with optical link modules (OLMs) and fiber-optic double

ring

• Redundancy with DP slaves, e.g. two redundant Profibus interface mod-

ules IM 152-1 in one ET 200iSP

• Operation of redundant DP/PA links on S7-H system

• Use of components of the SCALANCE system for integrating PROFIBUS

into end-to-end networks

Modern field devices such as transducers, actuators and drives have, in addi-

tion to the measured value or manipulated variable, many parameters which

must be changed during startup and, to some extent also during operation in

order to utilize the "intelligence" of these field devices such as preventive

maintenance or optimization of the interface to the sensor. On account of the

different time-related demands for data access of the master, PROFIBUS DP

offers cyclic and acyclic services.

All output values (control commands) are written to the field devices and all

input values (measured values) are read out of the field devices in one cycle.

Subsequently, an acyclic data interchange can take place with a particular field

device. Settings of the field devices can be read or parameters can be modified.

With the facility for supplementing each transmission cycle with precisely one

single acyclic message frame, short, deterministic cycle times are ensured as

the basis for software control in the programmable controller/automation sys-

tem.

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1.2.2 PROFIBUS PA

Introduction PROFIBUS PA is the extension of PROFIBUS DP to include the optimized

transmission system for field devices (for example, for powering the field de-

vices via the data cable and utilization in a hazardous environment up to Zone

0) while retaining the communications functions of PROFIBUS DP. This was

achieved by adopting the PROFIBUS DP protocol for PROFIBUS PA.

The choice of the internationally standardized transmission system MBP which

is defined in IEC 61158-2 alongside other connection technologies ensures the

future-oriented field installation with PROFIBUS PA. MBP is a transmission

technology with “Manchester Coding” and supply over the bus - “Bus Power-

ing”.

PROFIBUS PA is more than a two-wire line connecting the field devices

(transducers and actuators). The following sub-topics describe, in addition to

the technical properties of PROFIBUS PA, the integrating function of

PROFIBUS PA in the automation of chemical and industrial processes.

With its physical extension PROFIBUS PA, the PROFIBUS technology facili-

tates a complete solution for the process industry, i.e.:

• Networking of transducers, valves, actuators via a serial bus system

(two-wire line),

• with field device powering via the data cable, as well as

• for applications in hazardous areas ("intrinsically safe" type of protection

EEx[i])

Signal conversion Conversion of the PROFIBUS DP transmission system from RS485 (coding

with asynchronous NRZ code) to MBP (bit coding with synchronous Man-

chester code) for PROFIBUS PA takes place via the "DP/PA coupler" or

"DP/PA link" described in Chapter 3

Application PROFIBUS PA is designed for use in the intrinscially safe and non-

intrinsically safe areas.

1.3 PROFIBUS Components

1.3.1 Transition from PROFIBUS DP to PROFIBUS PA

Two network components, DP/PA coupler and DP/PA link, are available for

the transition of the transmission system from PROFIBUS DP (RS485) to

PROFIBUS PA (MBP). Their use is governed by the automation requirements.

DP/PA coupler The DP/PA coupler has the following tasks:

• Conversion of the data format from asynchronous (11 bits/character) to

synchronous (8 bits/character) and, associated with this, conversion of the

transmission rate from 45.45 kbit/s to 31.25 kbit/s. The DP/PA coupler

acts “like a wire”; it is not configured and cannot be detected by the bus

nodes.

• Powering of the field devices

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• Limiting of the supply current by barriers (for hazardous applications)

Two variants of the DP/PA coupler are available: a non-Ex variant with supply

for up to 31 field devices, and a certified Ex variant for operation in Zones 1

and 2 with powering of up to 9 field devices that can be installed in Zone 0.

Note:

The maximum usable number of field devices is governed by the current con-

sumption of the individual field devices (typ. 12 mA) and the maximum cur-

rents at the coupler outputs (110 mA for Ex-, 1000 mA for non-Ex variants).

The actual current consumption of all field devices on the segment, the voltage

drop that this causes in the line, and the minimum supply voltage required at

the coupler can result in a further limitation of the number of field devices or

the line length.

DP/PA ink The DP/PA link comprises up to 5 DP/PA couplers (Ex variants/

non-Ex variants) that are connected via a header module to PROFIBUS DP.

The header module is a slave on the higher-level PROFIBUS DP (12 Mbit/s

max.) and a master for the subordinate PA segments. These PA segments form

one logical bus. The maximum number of bus nodes in each PA master system

is restricted to 64. The total of all field devices on a DP/PA link is limited to

31. A restriction to 9 field devices on the Ex-coupler is a result of the maxi-

mum current carrying capacity. The maximum length of the frames for con-

figuration data, parameterization data, diagnostics data and for I/O data is 244

bytes in each case.

The DP/PA link is employed in the case of high demands on cycle time and

large quantity frameworks.

PROFIBUS DP

up to 12 MBit/s

DP/PA link

(modular expansion,

central module with

a max. of 5 couplers

)

PROFIBUS DP

45.45 kbit/s

DP/PA

coupler

PROFIBUS PA

31.25 kbit/s

24 V

Non-Ex version:

I < 400 mA,

max. 30 field devices

24 V

Non-Ex: max. 31 field devices per DP/PA link

Ex: max. 31 field devices per DP/PA link

24 V

Ex version:

I < 100 mA

max. 10 field devices

PROFIBUS PA

31.25 kbit/s

Fig. 1-4 Network components: DP/PA coupler and link module for

PROFIBUS DP/PA

Potential savings The comparison between conventional, that is, parallel cabling of the field

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devices and the PROFIBUS PA fieldbus system highlights the enormous po-

tential savings in configuring, hardware overhead, installation and plant docu-

mentation.

Terminal blocks

PROFIBUS-PA

Switchroom

24 V

Distributor

Separation EExi,

power supply

Terminal block

Distr. Distr.

PROFIBUS-DP

24 V

Switchroom

Fig. 1-5 Block diagram: comparison between parallel cabling and serial

cabling (fieldbus)

The cost savings when using PROFIBUS PA result primarily from the discard-

ing of terminal blocks, supply isolators and field distributors as well as reduced

space requirement in the switch room. Consequently, the costs of documenta-

tion and testing of field cabling with PROFIBUS PA are reduced to a mini-

mum (“a few two-wire lines”).

Clearly, fieldbus structures with PROFIBUS PA have considerably lower fault

potential than conventional cabling. If a fault should occur, it can be very

quickly located and corrected on account of the simple structure and detailed

diagnostics.

1.3.2 PROFIBUS PA configuration with SIMATIC S7

In conjunction with SIMATIC S7 and the SIMATIC PCS 7 control system, the

DP/PA coupler is used for smaller quantity frameworks or low time-related

demands, and the DP/PA link for large quantity frameworks and high time-

related demands. The DP/PA link permits configuration with up to 5 lower-

level PA lines with short cycle times (approximately 100 ms for 10 field de-

vices). This data is transferred to the SIMATIC PCS 7 control system via

PROFIBUS DP at up to 12 Mbit/s without significant loss of time (approxi-

mately 0.5 ms per link, maximum 123 links).

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Fig. 1-6 Applications of the DP/PA coupler and link module for

PROFIBUS DP/PA

Quantity framework Theoretically, as many as 7872 PA devices can be connected to one

SIMATIC S7:

• Interface module IM157 for implementing the bus transmission rates

− Slave on the PROFIBUS DP (one address), master on PROFIBUS PA

− Up to 64 PA devices

− The configuration frame and the useful data frames of the DP/PA link

are in each case derived from the frame contents of the lower-level

PA field devices. The maximum length of the frames for configura-

tion data, parameterization data, diagnostics data and for I/O data is

244 bytes in each case.

• DP/PA coupler for a PROFIBUS PA segment

− Integrated power supply - (Ex-option: Class 1, Div. 1, ZONE 0)

− Integrated terminating resistor

− Up to 31 (9 Ex) PA devices

• Total number of devices per PROFIBUS master system

− Up to 123 DP slaves

− DP/PA connection in one DP slave

-> 123 x 64 = max. 7872 PA devices

1.3.3 Transition from PROFIBUS DP RS485 to RS485-IS

In order to be able to use distributed IO devices in the Ex-area Zone 1,

PROFIBUS DP must be designed to be intrinsically safe. The RS 485-IS cou-

pler converts PROFIBUS DP to PROFIBUS RS485-IS intrinsically safe (type

of protection: intrinsic safety Ex i). The RS 485-IS coupler acts like a safety

barrier. IS stands for “intrinsic safety”.

The RS 485-IS coupler also enables devices, such as operating panels which

can only be operated in Zone 2, to be connected to PROFIBUS RS485-IS.

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On the intrinsically safe PROFIBUS, the hot swapping of PROFIBUS connec-

tors is possible under hazardous conditions. Likewise, the hot swapping of

modules of the ET 200iSP is possible.

RS 485-IS coupler Only field devices with certification for PROFIBUS RS485-IS interface or ET

200iS with PROFIBUS DP-Ex i interface can be connected to the RS 485-IS

coupler:

• max. 31 bus nodes (RS485-IS field devices)

with PROFIBUS RS485-IS interface

• max. 16 bus nodes (ET 200iS stations)

with PROFIBUS DP Ex i interface.

RS 485-IS couplers have a repeater functionality in order to amplify data sig-

nals on bus cables and to couple bus segments.

Repeaters are used where:

− the maximum number of nodes permitted in the hazardous area is ex-

ceeded,

− the maximum line length in one segment of the hazardous area is ex-

ceeded,

− a PROFIBUS RS485-IS segment is coupled with a PROFIBUS DP

Ex i segment.

RS 485-IS

coupler

maste

Safe area EX Zone

Segment 1 Segment 2

SSS SS

PROFIBUS DP RS485-IS

fro m

acc. to PROFIBUS-guideline 2.262

S slaves up to 16/32 devices

Fig. 1-7 Structure of an RS485-IS segment

All devices connected to the PROFIBUS RS485-IS must comply with the

PROFIBUS interface guideline 2.262. This defines maximum safety values,

taking into account the PTB Report “Volume 113, Issue 2/2003”. If these limit

values are observed, no ignitable sparks are created in the bus system.

• Max. input voltage between signal lines: Ui = 4.2 V

• Max. input current on signal lines: Ii = 4.8 A

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• The voltage sources have a linear characteristic

• Maximum L/R ratio of the cable: L’/R’ = 15 μH/Ω

• For the relevant voltage (< 10 V) the cable capacity does not represent any

additional danger. Nevertheless, for functional reasons the cable capacity

for the bus cable is restricted to C' < 40 nF/km.

• No concentrated inductances are permissible at the RS485-IS. The capaci-

ties at the RS485-IS should be geared toward a standard RS485 installa-

tion for PROFIBUS.

• Maximal safety values of the RS485-IS

− The maximum safety values Uo and Io for each device can be calcu-

lated as follows for a maximum number of bus nodes N=32:

− Max. output voltage between signal lines:

Uo = Ui = 4.2 V

− Max. output current on signal lines:

Io = Ii/N = 4.8/32 = 0.15 A

− Definition: The maximum output voltage of a device for the RS485-IS

is defined with Io ≤ 149 mA. The remaining total current of 32 mA is

reserved for two external active bus terminations.

1.3.4 Overview of PROFIBUS applications

Various transmission methods are available in the PROFIBUS system: This

makes it possible to connect field devices over great distances to the central

automation device/system while observing the time constraints:

Connect.

layer

Application Max. segment length

@ baud rate

RS485 Distributed IO

Intelligent drives

Intelligent field

devices

1200m @ <93.75 kbit/s

1000m @ 187.5 kbit/s

400m @ 500 kbit/s

200m @ 1.5 kbit/s

100m @ 12 Mbit/s

RS485-IS Distributed Ex-IO 1200m @ <93.75 kbit/s

1000m @ 187.5 kbit/s

400m @ 500 kbit/s

200m @ 1.5 Mbit/s

PROFIBUS

Glass fiber Fast transmission

Long distances

EMC stability

> 10000m @ 12 Mbit/

PROFIBUS

MBP

(Mancheste

r Coded

Bus

Powered)

Process devices

Power supply via the

bus

Ex-applications

1900m @ 31.25 kbit/s

Table 1-2: Overview of PROFIBUS applications

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1.4 HART Functions

Introduction HART (highway addressable remote transducer) is a serial transmission

method with which additional data can be transferred via a 4 mA to 20 mA

current loop. The HART protocol describes the physical form of the transmis-

sion, transaction procedures, message structure, data formats and many com-

mands. Furthermore, HART users can define their own commands.

HART signal The HART signal is a digital communication modulated onto the normal

analog signal. Sine waves of 1200 Hz and 2200 Hz represent the HART signal

and are modulated onto the analog signal (4 – 20 mA). Since the signal has a

mean value of 0, the analog signal is not affected. The HART signal can be

easily filtered out with a filter, and the original analog signal is then available

again. In addition, the HART signal can be evaluated:

• HART signal with a frequency of 2200 Hz signifies a logical “0”

• HART signal with a frequency of 1200 Hz signifies a logical “1”

• The signal sequences are transferred alternately as the command (C) and

response (R).

Application criteria/ HART modules are characterized by the following application criteria and

characteristics characteristics:

• The vendor-independent HART Communication Foundation (HCF) has

developed this transmission technology as a standard.

• Several million HART devices are in operation worldwide.

• They are pin-compatible with conventional analog modules.

• Additional communication facilities via the current loop.

• The low power requirement with HART favors its application in hazard-

ous areas.

The utilization of HART in the ET 200 distributed IO system is possible with

HART analog modules.

1.5 Configuration of the PROFIBUS Network

Tools In a SIMATIC project, field devices and distributed IO components are

configured for communication with the PROFIBUS master using the STEP 7

HW-Config configuration tool and parameterized with SIMATIC PDM.

Configuration The hierarchical structure of networks and communication components

including the process devices is set out in graphic form. The modules are

automatically assigned addresses which can be adapted where required. The

devices to be configured are contained in the catalogs of STEP7 HW-Config.

Non-Siemens devices can additionally be integrated using the device master

file (GSD) or electronic device description (EDD).

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Parameterization Using the SIMATIC PDM process device manager, the device-specific data

and functions of the configured devices are set. The SIMATIC PDM process

device manager is used as an integrated tool in STEP 7 or as a standalone tool

under Windows 2000/XP.

Parameters are set for units of measurement, limit values, default values and

value ranges for the cyclic communication and interrupt and diagnostics mes-

sages for the acyclic communication. A further parameterization function is the

setting of bus parameters of the communication modules.

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Field Automation Components

This chapter contains:

2.1 Introduction 2–2

2.2 Hardware Components 2–2

2.2.1 PROFIBUS PA 2–2

2.2.2 HART modules of the ET 200M 2–3

2.2.3 ET 200iSP 2–5

2.2.4 RS 485-IS coupler 2–7

2.3 Configuring the Field Systems 2–9

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2.1 Introduction

This chapter provides you with an overview of the field automation compo-

nents. Detailed descriptions of the individual components can be found in the

corresponding manuals which are referred to in the appropriate sections. These

descriptions concern the following components:

Hardware:

• PROFIBUS PA

− PROFIBUS DP/PA coupler

− PROFIBUS DP/PA link

• HART modules of the ET 200M

− Analog input module SM331, AI 2 x 0/4...20mA HART Ex(i)

− Analog output module SM332, AO 2 x 0/4...20 mA HART Ex(i)

• ET 200iSP with the components

− Interface module IM152-1

− 4 AI HART, for 2-wire connection

− 4 AI HART, for 4-wire connection

− 4 AO HART

• RS 485-IS coupler

Software:

• STEP 7 (HW-Config)

• PCS 7 driver library

• SIMATIC PDM field device parameterization tool

• COM PROFIBUS

2.2 Hardware Components

2.2.1 PROFIBUS PA

Applications DP/PA bus communication can be used in S7 and PCS 7.

You can connect all field devices certified for PROFIBUS PA. The modules

are of modular S7-300 design.

DP/PA coupler DP/PA coupler is available in the following variants:

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• DP/PA coupler EEx [i]: 6ES7 157-0AD82-0XA0

• DP/PA coupler: 6ES7 157-0AC82-0XA0

The DP/PA coupler has the following features:

• Type of protection: [EEx ia] II C (6ES7 157-0AD82-0XA0 only)

• Intrinsic safety (6ES7 157-0AD82-0XA0 only)

• Electrical isolation between PROFIBUS DP and PROFIBUS PA

• Diagnostics via LEDs

• Baud rate on PROFIBUS DP 45.45 kBd

• Baud rate on PROFIBUS PA 31.25 kBd

Detailed information can be found in /502/

DP/PA link The DP/PA link is available in the following variants:

• DP/PA link interface module IM 157 (6ES7 157-0AA00-0XA0) with:

− DP/PA coupler EEx [i]: 6ES7 157-0AD82-0XA0

− DP/PA coupler: 6ES7 157-0AC82-0XA0

The DP/PA link has the following features:

• Type of protection: [EEx ia] II C (6ES7 157-0AD82-0XA0 only)

• Intrinsic safety (6ES7 157-0AD82-0XA0 only)

• Electrical isolation between PROFIBUS DP and PROFIBUS PA

• Baud rate on PROFIBUS DP 12 Mbit/s max.

• Baud rate on PROFIBUS PA 31.25 kBd

• Diagnostics via LEDs

• Max. number of DP/PA couplers per DP/PA link: 5

• Implementation of the IM 157 as DPV1 slave

• Master Class 2 connections to slaves on secondary bus, regardless of

transfers

Detailed information can be found in /502/

2.2.2 HART modules of the ET 200M

Application The HART analog modules are primarily intended for use in SIMATIC

S7 and PCS 7. You can connect all field devices certified for digital communi-

cations with the HART protocol. However, you can also connect field devices

with “conventional” 0/4 – 20 mA systems without the HART protocol. The

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modules are of modular S7-300 design. With PCS 7, the HART modules oper-

ate within the ET 200M distributed IO. Detailed information on the ET 200M

distributed I/O device can be found in /140/.

Analog input Analog input module SM 331; AI 2 x HART(6ES7 331-7TB00-0AB0)

module has the following characteristics:

• Inputs in 2 channel groups

• Adjustable measured value resolution per channel (depending on the set

integration time)

• Deactivation facility for measurement mode selection of the channels

− Two-wire connection of transducers

− Four-wire connection of transducers

− Channels can be deactivated

• Current signal selectable for each channel

− 0 ... 20 mA (without HART function)

− 4 ... 20 mA (with/without HART function)

• Parameterizable diagnostics

• Parameterizable diagnostic alarm

• Two channels with limit monitoring

• Parameterizable limit alarm

• Channels electrically isolated from each other

• Open circuit monitoring

• Channels electrically isolated from CPU and L+ load voltage

Analog output Analog output module SM 332; AO 2 x HART(6ES7332-5TB00-0AB0)

module has the following characteristics:

• Two current outputs in two channel groups

• 12 bit resolution (+sign)

• Output mode selectable for each channel

− Current with HART

− Current without use of HART

− Channel deactivated

• Choice of any output range per channel

− 0 ... 20 mA (without HART function)

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− 4 ... 20 mA

• Diagnosis and diagnostic alarm parameterizable

− Diagnostic alarm

− Group diagnostics

− Channels electrically isolated from each other

− Channels electrically isolated from CPU and L+ load voltage

− Read-back capability of analog outputs

Detailed information can be found in /503/

2.2.3 ET 200iSP

Application The distributed IO device ET 200iSP is a bit-modular DP slave with IP 30

protection. Each ET 200iSP consists of a power supply module, an interface

module and a maximum of 32 electronic modules. The ET 200iSP can be used

in hazardous areas. Intrinsically safe encoders, actuators and HART field de-

vices can be connected.

Approval ET 200iSP node* Inputs and outputs

Zone 1, Zone 21 Zone 0, Zone 20 CENELEC

Zone 2, Zone 22 Zone 0, Zone 20

* in connection with an appropriate enclosure

Detailed information can be found in /601/

Interface module The interface module IM152-1 (6ES7 152-1AA00-0AB0)

has the following properties:

• Connects the ET 200iSP to the PROFIBUS RS485-IS

• Prepares the data for the equipped electronic modules

• The PROFIBUS address can be set by means of switches

• Switching off the 24 V DC supply voltage at the terminal module TM-PS-

A also switches off the interface module IM 152

• The maximum address size is 244 bytes for inputs and 244 bytes for out-

puts

• Can be operated as DPV0-, S7 DP and DPV1 slave

• Slot for the SIMATIC Micro Memory Card (MMC)

• Firmware is updated via PROFIBUS DP or MMC

• Backup of electronic module parameters:

• The parameters/data are stored in the MMC of the IM 152.

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• After switching on the voltage supply of the ET 200iSP, the IM 152 dis-

tributes the saved parameters/data to the electronic modules (e.g. replace-

ment values for the output modules).

• The PROFIBUS DP is then released and the automation system is put into

operation by the DP master.

• Only when the ET 200iSP is exchanging data with the DP master will the

current data of the DP master be replaced during output of the replacement

values (of the MMC).

• Redundancy of the IM 152

Analog module The analog input module 4 AI I 2WIRE HART (6ES7 134-7TD00-0AB0)

4 AI I 2WIRE HART has the following properties:

• 4 inputs for the connection of HART field devices,

2-wire transducers (standard applications)

• Input range parameterizable: HART, 4 to 20 mA

• Resolution 12 bits + sign

• Power supply of the transducers

• Feed current max. 23 mA (per channel)

• Short-circuit-proof

• Electrical isolation

− between channels and backplane bus

− not between the channels

− between channels and power bus

• Limit value interrupt parameterizable

• Diagnostic alarm parameterizable

• Diagnostics functions via LEDs, readable

• Open circuit monitoring

Analog module The analog input module 4 AI I 4WIRE HART (6ES7 134-7TD50-0AB0)

4 AI I 4WIRE HART has the following properties:

• 4 inputs for the connection of HART field devices,

4-wire transducers (standard applications)

• Input range parameterizable: HART, 0 to 20 mA, 4 to 20 mA

• Resolution 12 bits + sign

• No power supply to the transducers

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• Short-circuit proof – yes

• Electrical isolation

− between channels and backplane bus

− not between the channels

− between channels and power bus

• Limit value interrupt parameterizable

• Diagnostic alarm parameterizable

• Diagnostics functions via LEDs, readable

• Open circuit monitoring

Analog module The analog output module 4 AO I HART (6ES7 135-7TD00-0AB0)

4 AO I HART has the following properties:

• 4 outputs for current output

• Output ranges (parameterizable):

− HART

− 4 to 20mA

− 0 to 20mA

• 14 bit resolution

• Electrical isolation

− between channels and backplane bus

− not between the channels

− between channels and power bus

• Diagnostic alarm parameterizable

• Diagnostics functions via LEDs, readable

• Short-circuit and open-circuit monitoring

• Substitute values can be connected and parameterized

2.2.4 RS 485-IS coupler

Application For the transition of the transmission technology from PROFIBUS DP

(RS485) to the intrinsically safe PROFIBUS DP (RS485-IS), the isolating

transformer SIMATIC RS 485-IS coupler is available. This enables the use of

intrinsically safe DP devices (e.g. ET 200iSP) as far as Zone 1. It is installed in

Zone 2.

Detailed information can be found in /602/

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RS 485-IS coupler The RS 485-IS coupler (6ES7 972-0AC80-0XA0)

has the following properties:

• Intrinsic safety for subordinate PROFIBUS RS485-IS

• Transmission speed of 9.6 kbit/s to 1.5 Mbit/s

• On each RS 485-IS coupler, up to 31/16 DP bus nodes can be operated

• Integrated bus termination for PROFIBUS RS485-IS

• Repeater function in hazardous area possible with two RS 485-IS couplers

(same behavior as RS485 repeater)

• Repeater-functionality, max. 5 segments in a row

• Certification according to ATEX 100a

• Diagnostics via LEDs

• Transmission rate on PROFIBUS DP and PROFIBUS RS485-IS

9.6; 19.2; 45.45; 93.75; 187.5; 500; 1500 Kbaud

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2.3 Configuring the Field Systems

Introduction Extensive and convenient software tools are available for configuring the

field automation components. Integration takes place according to standard

rules, irrespectively of whether it is a standard I/O module or a module with

HART functionality or a DP slave or PA slave. The principle of integration is

uniform. The capabilities of the new components are described in more detail

in the following sections.

COM PROFIBUS The COM PROFIBUS program package is a testing, diagnostics and

parameterization software package for PROFIBUS DP. You require COM

PROFIBUS to configure the bus structure. COM PROFIBUS is also well

suited to the linking of field devices to non-Siemens (non-SIMATIC) DP mas-

ters. To this end, COM PROFIBUS is used to create a GSD file which is

loaded into the non-SIMATIC system. Further information and instructions

can be found in /501/.

In the S7/PCS7 system, the configuration of the PROFIBUS is generally per-

formed with STEP7 HW-Config.

Field device blocks Field device blocks are needed to transfer process data between the I/Os for

process data processing. These field device blocks implement the interface to

the hardware, including verification functionality.

Detailed information on parameter assignment for blocks can be found in

/258/, Chapter 5.

A detailed description of all field device blocks can be found in /260/.

Hardware Hardware configuring within the STEP 7 program package of the S7/PCS 7

configuring automation system is a convenient configuring tool for creating the hardware

structures within your projects. You can use it for configuring and assigning

parameters to modules of a centralized configurations as well as of DP/PA de-

vices in a distributed configurations.

"Configuring" means:

• The arrangement of racks, modules, interface modules and devices.

During configuring, the addresses in the I/O area of the S7-400 are automati-

cally assigned to the individual modules.

“Parameterization” means:

• The setting of parameters for parameterizable modules for centralized con-

figurations and for a network.

• The setting of bus parameters, DP master and DP/PA slave parameters for

a PROFIBUS DP or DP/PA network.

Detailed information can be found in /231/

SIMATIC PDM SIMATIC PDM is a software package for configuring, parameterization,

commissioning and maintenance of devices (e.g. transducers, field devices for

the PROFIBUS PA packages and HART analog modules) and for configuring

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networks. SIMATIC PDM contains a process monitoring feature for process

values, interrupts and status information of the device.

SIMATIC PDM is an open tool for device integration. More than 1000 devices

have already been integrated by more than 100 device manufacturers. The ba-

sis for the device integration is the EDDL (electronic device description lan-

guage). The EDD (electronic device description) is created by the device

manufacturer or a service provider. It is supplied by the device manufacturer

on a data medium together with the device, made available on the Internet or

integrated into device catalogs of EDD applications.

The catalog of the HART devices of the HART Communication Foundation

(HCF) is integrated in PDM. Fig. 2-1 shows the integration of non-Siemens

devices by means of SIMATIC PDM.

DMF

EDD

Download from

manufacturer

PDM DMF

Device Master File

EDD

Electronic Device

Description

Fig. 2-1 Integration of any field devices in SIMATIC PDM

SIMATIC PDM has also been released for operation under Windows 2000,

Windows Me and Windows XP.

With the option “Integration in STEP 7/PCS 7” SIMATIC PDM is based on

the software package SIMATIC STEP 7 or SIMATIC PCS 7 and is integrated

permanently in the existing installation as an option package. This option addi-

tionally allows the configuration of PROFIBUS DP/PA networks and devices

with the aid of STEP 7 HW-Config.

The following networks are supported:

• PROFIBUS DP network

• PROFIBUS PA network

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• HART modem

• HART interface network

• HART multiplexer network

• SIPART-DR network

• SIREC network

• MODBUS network

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Description of the Components

This chapter contains:

3.1 Hardware 3–2

3.1.1 DP/PA coupler 3–2

3.1.2 DP/PA link 3–3

3.1.3 HART modules of the ET 200M 3–4

3.1.3.1 Two-channel analog input module 3–4

3.1.4 ET 200iSP 3–5

3.1.5 RS 485-IS coupler 3–7

3.2 Software / Configuration 3–8

3.2.1 Configuration / quantity framework 3–8

3.2.2 Addressing of PROFIBUS PA field devices 3–9

3.2.3 Parameter assignment / device profiles 3–11

3.2.4 DMF and EDD descriptions 3–14

3.2.5 Driver function blocks for field automation 3–15

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3.1 Hardware

3.1.1 DP/PA coupler

Variants Two variants of the DP/PA coupler are available: a non-Ex variant with up to

1000 mA output current for the PA bus, and an Ex variant with up to 110 mA

output current. The PA bus cable of the Ex variant can be used in hazardous

areas. The DP/PA coupler itself must be installed outside the hazardous area.

Mechanical design The mechanical design is characterized by the following points:

• Modular S7-300 design on a flat rail with swivel-mounting and screw fix-

ing.

• Arrangement of all indicators and connecting elements on the front side of

the module.

• Recessed arrangement of all plug-in connectors, covered by means of the

front doors.

• Housing with degree of protection IP 20.

• Cooling by convection.

• Horizontal installation.

• For shielding purposes, the S7 300 rail serves as the functional ground

reference point. Each module has an upper and lower shield contact spring

at the rear to provide the electrical connection to the mounting rail when

the module has been secured. Furthermore, the modules are equipped with

additional shielding plates.

• Adequate EMC is ensured through the use of plastic housings and fiber

optic elements for the status indications.

• The maximum overall mounting depth is 130 mm, height 125 mm. The

width of the DP/PA coupler is 80 mm.

• The mounting rail is supplied in various widths for cabinet installation,

and in 2m lengths (standard S7-300 rail).

• Installation clearance of 40 mm above and below the module is necessary

for module handling, on account of the swivel-mounting system and se-

curing by means of a screwdriver. Cable ducts must be fitted outside these

clearances.

Connection system The connection system is characterized by the following points:

• The 24 V DC supply voltage is connected with 4-pole screw terminals.

• The PROFIBUS DP interface is connected with a 9-pin sub D connector.

Strain relief and shielding are provided by this sub D male connector.

• With the non-intrinsically safe variant, the PROFIBUS PA interface is

connected via four screw terminals. The user can terminate the PA cable

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or loop it through, as required. The terminating resistor is selectable and

integrated in the housing.

• With the intrinsically safe variant, the PROFIBUS PA interface is con-

nected via two screw terminals. The intrinsically safe DP/PA coupler is

always situated at the end of the PA cable. The terminating resistor inte-

grated in the housing is always active. With the intrinsically safe variant,

this means that the PROFIBUS PA must not be looped through.

• In both versions, the shield contact of the PA cable also serves for strain

relief.

A more detailed description of the module can be found in the DP/PA coupler

Manual /502/.

3.1.2 DP/PA link

Variants The DP/PA link is formed from the IM 157 interface module and one or more

DP/PA couplers (Ex or non-Ex variants). All components of the DP/PA link

are interconnected via S7-300 standard bus connectors.

By combining the IM 157 with Ex or non-Ex variants of the DP/PA coupler,

Ex or non-Ex variants of the DP/PA link are also possible. This modular sys-

tem can be expanded to up to 5 PA lines.

Fig. 3-1 The DP/PA link with IM 157 interface module and a DP/PA cou-

pler

Mechanical design The mechanical design is characterized by the following points:

• Modular S7-300 design on a shallow rail with swivel-mounting and screw

fixing.

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• The maximum overall mounting depth is 130 mm, height 125 mm. The

width of the IM 157 is 40 mm. The overall width of the DP/PA link de-

pends on the number of DP/PA couplers used.

• The remaining mechanical design data is the same as for the DP/PA cou-

pler.

Connection system The connection system is characterized by the following points:

• The 24 V DC supply voltage is connected with 4-pole screw terminals.

• The PROFIBUS DP interface is connected only to the IM 157 with a 9-pin

sub D connector. The PROFIBUS DP interfaces of the DP/PA couplers

used in the DP/PA link have no function. Strain relief and shielding are

provided by this sub D male connector.

• With the non-intrinsically safe variant, the PROFIBUS PA interface is

connected via four screw terminals. The user can terminate the PA cable

or loop it through, as required. The terminating resistor is selectable and

integrated in the housing.

• With the intrinsically safe variant, the PROFIBUS PA interface is con-

nected via two screw terminals. The intrinsically safe DP/PA coupler is

always situated at the end of the PA cable. The terminating resistor inte-

grated in the housing is always active.

• In both versions, the shield contact of the PA cable also serves for strain

relief.

A more detailed description of the module can be found in the DP/PA coupler

Manual /502/.

3.1.3 HART modules of the ET 200M

3.1.3.1 Two-channel analog input module

Mechanical design The mechanical design is characterized by the following points:

• Modular S7-300 design on a shallow rail with swivel-mounting and screw

fixing.

• For operation in a distributed configuration in the ET 200M with the IM

153-2 interface module. Detailed information on the ET 200M distributed

IO device and interface module can be found in /140/.

• Arrangement of all indicators and connectors at the front of the module.

• Recessed arrangement of all plug-in connectors, covered by means of the

front doors.

• Housing with degree of protection IP 20.

• Cooling by convection.

• Horizontal installation.

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• For shielding purposes, the S7 300 rail serves as the functional ground

reference point. Each module has an upper and lower shield contact spring

at the rear to provide the electrical connection to the mounting rail when

the module has been secured.. Furthermore, the modules are equipped

with additional shielding plates.

• Adequate EMC is ensured through the use of plastic housings and fiber

optic elements for the status indications.

• The maximum overall mounting depth is 130 mm, height 125 mm. The

width of the module is 40 mm.

• The mounting rail is supplied in various widths for cabinet installation,

and in 2m lengths (standard S7-300 rail).

• Installation clearance of 40 mm above and below the module is necessary

for module handling, on account of the swivel-mounting system and se-

curing by means of a screwdriver. Cable ducts must be fitted outside these

clearances.

Connection system The connection system is characterized by the following points:

• The 24 V DC supply voltage is connected at the 20-pin front connector by

means of screw terminals.

• The 0/4 to 20 mA process signals are connected at the 20-pin front con-

nector by means of screw terminals.

• Strain relief at the front connector.

• Shielding depends on the conductor cross-section, by means of shield con-

tact elements to be ordered separately.

• Hot swapping of the module is possible with an active backplane bus.

A more detailed description of the module can be found in the Manual /503/.

3.1.4 ET 200iSP

Mechanical design The mechanical design is characterized by the following points:

• The distributed IO device ET 200iSP is a bit-modular and intrinsically

safe DP slave with IP 30 protection.

• Rugged construction according to SIMATIC standard thanks to mounting

on a 300 rail system.

• In conjunction with an appropriate housing it can be used in hazardous ar-

eas with a gaseous or dusty atmosphere.

• The I/O device ET 200iSP principally comprises various passive terminal

modules, into which the power supply module, the interface module and a

maximum of 32 electronics modules are plugged.

• It can be operated at temperatures between -20°C and +70°C

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Fig. 3-2 ET 200iSP – mechanical design

Connection system The connection system is characterized by the following points:

• The ET 200iSP is connected to the PROFIBUS RS485-IS by means of a

connector on the terminal module TM-IM/EM

• Screw terminals or spring terminals – use of the most favorable connec-

tion technology

• Integral power bus – reduced wiring overhead

• Intrinsically safe inputs and outputs according to EEx ia IIC.

• Intrinsically safe encoders, actuators and HART field devices as far as

Zone 0 / 20 can be connected

• “Hot-swapping”, i.e. pulling and inserting modules during live operation

and under Ex conditions, is possible

• All digital outputs of a module can be switched off by means of an intrin-

sically safe switching signal

A more detailed description of the modules can be found in the ET 200iSP

distributed IO device manual /601/.

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3.1.5 RS 485-IS coupler

Mechanical design The mechanical design is characterized by the following points:

• The RS 485-IS coupler is an open resource. This means that it may only

be set up in housings, cabinets or electrical operating rooms which are

only accessible by means of keys or tools. Access to the housings, cabi-

nets or electrical operating rooms should only be granted to persons with

the necessary approval or instructions.

• The RS 485-IS can be mounted vertically or horizontally. If mounted ver-

tically, the maximum ambient temperature is +40°C.

• The RS 485-IS coupler is mounted on a DIN rail for the S7 design. To en-

sure trouble-free installation, the module should be mounted with a clear-

ance of 40 mm above and below.

• The RS 485-IS coupler does not transmit any signals on the S7 backplane

bus.

• Further notes on the installation of S7-design modules can be found in the

Installation Manual for Automation System S7-300, Setup (6ES7398-

8FA10-8AA0) /603/.

Figure 3-3 RS 485-IS coupler

Connection system The connection system is characterized by the following points:

• The 24 V DC supply voltage is connected with a 4-pole screw terminal, of

grounded or non-grounded design.

• PROFIBUS DP and internal logic circuits are non-isolated.

• PROFIBUS DP RS485 and RS485-IS are electrically isolated from the 24

V supply.

• PROFIBUS DP RS485 and RS485-IS are electrically isolated from each

other.

A more detailed description of the module can be found in the manual.

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3.2 Software / Configuration

3.2.1 Configuration / quantity framework

DP/PA coupler

Fig. 3-4 Schematic representation for the determining of cycle times on the

PROFIBUS PA using a coupler module

Within the bus cycle time, each field device exchanges the most important in-

put and output data with the master. Additionally, the master accesses a par-

ticular field device, for example, to write parameter assignment data or to read

diagnostic parameters. The number of field devices on the PROFIBUS PA

segment governs the bus cycle time, i.e. the time base in which the process

values are exchanged with the field devices. The bus cycle time is obtained by

adding the cyclic messages to all field devices, and the acyclic message to a

particular field device. In the example:

3 x 10 ms + 2x15 ms + 20 ms = 80 ms.

Note:

The value of 10 ms within the bus cycle time applies to field devices which

exchange a measured value or manipulated value with its corresponding status,

i.e. 5 bytes of useful data per cycle, with the programmable controller/system.

Examples of these field devices are pressure, temperature, level transducers,

valves and actuators. Complex field devices, for example those providing sev-

eral measured variables simultaneously (such as flow transducers), require ad-

ditional transfer time. With average field instrumentation, the number of these

complex field devices is relatively low and their influence on the overall bus

cycle time is negligible.

04.2005 3 Description of the Components

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3–9

DP/PA link

Fig. 3-5 Schematic representation of the determining of cycle times on the

PROFIBUS PA using a DP/PA link module

With the DP/PA link in operation, all cyclic frames and one acyclic frames are

relayed via PROFIBUS DP to the programmable controller / system within the

cycle of the PROFIBUS PA line, in one message frame each. On account of

the high data transmission rate of up to 12 Mbit/s, the delay in data transmis-

sion is insignificant (only about 1 ms even with 31 field devices per DP/PA

link). The DP/PA link (for SIMATIC PCS 7) has the same time response as the

DP/PA coupler, up to the maximum number of connectable field devices (31

field devices per DP/PA link. Decisive advantages are obtained with structures

in which the field devices are distributed over several DP/PA links. At a

transmission rate of 12 Mbit/s on the higher-level PROFIBUS DP, the delays

are only in the 1 ms range; the cycle time thus remains almost independent of

the number of field devices. With ten non-complex field devices per DP/PA

link, the cycle time is approximately 100 ms, and with 30 non-complex field

devices per DP/PA link it is approximately 300 ms, if the communication is

exclusively cyclic. The cycle times are extended by the duration of all acyclic

message frames.

3.2.2 Addressing of PROFIBUS PA field devices

DP/PA coupler When applying the DP/PA coupler, the field devices are addressed directly

from the programmable controller/system; the DP/PA coupler is transparent

and does not need to be configured in the HW-Config.

04.2005 3 Description of the Components

SIMATIC Field Automation

3–10

DP/PA coupler (see Fig. 3-6, left half): The DP/PA couplers are not apparent

to the programmable controller/system (bus node 1) so that the field devices

(nodes 2, 3 and 4) – as seen from addressing – are connected to the same

PROFIBUS segment. In this case the field devices are treated as single slaves.

PROFIBUS DP

45.45 kbit/s

DP/PA

coupler

PROFIBUS PA

31.25 kbit/s

24 V

PROFIBUS DP

up to 12 Mbit/s

DP/PA link

24 V

2 3

24 V

Slave

Master

PROFIBUS PA

31.25 kbit/s

2 3

Bild 3-6 Addressing of field devices within an automation system on

PROFIBUS PA

DP/PA link The DP/PA link is a slave on PROFIBUS DP and a master on PROFIBUS PA.

The programmable controller/system addresses the field devices via the DP/PA

link, that is, indirectly. The DP/PA link must be configured in the HW-Config.

The couplers used on the link, however, are not.

DP/PA link (see Fig. 3-6, right half): each DP/PA link (nodes 2 and 3 on

PROFIBUS DP) is a node (slave) on the higher-level PROFIBUS DP and

therefore appears to the programmable controller/system with only one node

address each. In addition, each DP/PA link (node 1 on PROFIBUS PA) is the

master for the field devices connected to it (nodes 2 and 3 or 2 on PROFIBUS

PA).

Thus the DP/PA link acts as a "decoupler", allowing the SIMATIC PCS 7 con-

trol system an extremely large addressing volume (theoretically 64 nodes per

PA master system, with 123 slaves on the DP bus, i.e. theoretically 7872 field

devices per SIMATIC S7-400). In practice this is limited by the maximum

number of measured values to be processed in the user program of the S7-400

CPU.

Summary In Table 3-1 shows the relationship between project scope and time response -

using a DP/PA coupler and link modules with different configurations. It can

be seen that where two or more link modules are used with the same number of

field devices, the loading on the DP line corresponds approximately to the

loading of only one link module.

04.2005 3 Description of the Components

SIMATIC Field Automation

3–11

Cycle times on shared DP bus [ms] No. of field

devices on

PA couplers

PA coupler

without link

PA coupler

with link

10 100 100

30 300 300

60 600 300

90 900 300

Table 3-1: Quantity framework and cycle times PROFIBUS PA

Assumptions:

max. 30 devices per coupler, 10 ms/device, no acyclic communication

HART HART analog modules are used within the ET 200 M distributed I/O

system. Support of communication with HART devices via HART analog

module, inserted centrally in an S7-300, is not provided. Addressing takes

place accordingly. Further information can be found in /140/.

3.2.3 Parameter assignment / device profiles

Introduction In order to allow uniform device responses, device profile definitions exist

(Section 5.3). The basic configuration is explained in more detail below.

PROFIBUS PA

Measuring range

Filter time

Alarm/warning limits

Alarm summary

TAG

Vendor-specific

parameters

DP services

cyclic and

acyclic

DP services

acyclic

DP services

acyclic

PA profile

(e.g. for

pressure

transmitters)

Status

Measured value

Fig. 3-7 Schematic representation of a device profile for the PA profile on

PROFIBUS PA

Parameter groups The parameters in a field device can be classified in three groups:

1. Process parameters: measured or manipulated value and corresponding

status.

2. Operating parameters: measuring range, filter time, interrupt parameters

(message, interrupt and warning limits), standard parameters (measuring

point identifiers, TAG).

04.2005 3 Description of the Components

SIMATIC Field Automation

3–12

3. Manufacturer-specific parameters, such as special diagnostic information.

1st group The parameters of the first group are read or written cyclically or acyclically

by the programmable controller/system. The measured value and status

parameters are present in all measuring field devices, and the manipulated

variable and status parameters are in all actuating field devices and are coded

uniformly (for example, measured/manipulated value in 4-byte IEEE format).

2nd group The parameters of the second group can be read and written acyclically by

the programmable controller as required. Some of these parameters are

exchanged with the field devices via the function blocks in the programmable

controller/system, to allow access of the HMI system (for example,

visualization of alarm violation).

The parameters, i.e. the associated field device functions of the first and

second groups, are defined in the PA profile of the PI guidelines (PROFIBUS

International) for PROFIBUS PA. Some of these field device functions are

mandatory and some optional. Where optional functions are implemented in

the field device, they must comply with the description according to the PA

profile.

3rd group The parameters of the third group are manufacturer-specific. Acyclic

access usually takes place with a personal computer for diagnostic and

maintenance purposes. In exceptional cases, certain parameters are also read or

written from this group by the programmable controller/system.

Interoperability Programmable controllers/systems and PCs of different manufacturers can

read/write the parameters defined in the PA profile from all field devices via

PROFIBUS PA, thus affecting the field device functions defined in the PA

profile.

The term "interoperability" is understood to mean the interaction between

components (control systems and field devices in this case) of different

manufacturers on an open bus system, on the basis of a vendor-independent

definition of the device and communications functions.

04.2005 3 Description of the Components

SIMATIC Field Automation

3–13

Fig. 3-8 Schematic representation of the interoperability of field devices on

the basis of the device profile on PROFIBUS PA

The interoperability of the PROFIBUS allows the user to operate field devices

from different manufacturers on one controller. The basis for this are the de-

vice descriptions DMF and EDD.

When configuring the bus with the engineering system, the communication pa-

rameters for the PROFIBUS master are generated from the DMF. These de-

termine the properties and the scope of functions of the cyclic master-slave

communication.

On the basis of the EDD supplied by the device manufacturer, the specific de-

vice parameters of the acyclic communication can be defined (e.g. for parame-

ter assignment, diagnostics or measured value monitoring) with the aid of a

suitable engineering tool, such as SIMATIC PDM.

Detailed information on the individual special device profile definitions can be

found in Section 5.3.

Interoperability The PROFIBUS master recognizes the manufacturer and PA profile of the

devices connected to PROFIBUS from their DMF identification numbers. By

means of a vendor-independent “PA profile”, PROFIBUS devices of one pro-

file family can simply be replaced by comparable devices from another manu-

facturer.

Universal PA profiles such as these are available for

• Devices for counting

• Devices for measuring pressures, flows or levels

• Positioners

• Analyzers

• Digital input/output devices

• Multi-variable devices

Fig. 3-9 Schematic representation of the exchangeability of field devices on

the basis of the device profile on PROFIBUS PA

04.2005 3 Description of the Components

SIMATIC Field Automation

3–14

HART module

fast cyclic reading

by S7-400,

0/4 - 20 mA

slow acyclic read/ w

by SIPROM or

HART-handheld,

digital

common

practice

universal

device

specific

Measured value

Vendor

TAG

Measuring range

Filter time

larm/warnin

limits

Vendor-specific

parameters

Fig. 3-10 Schematic representation of a device profile for HART

communications

Parameter groups The parameters in a HART field device can be classified in three groups:

1. Universal: measured or manipulated value, manufacturer name and meas-

uring point tag (TAG).

2. Common practice: Measuring range, filter time, interrupt parameters

(message, interrupt and warning limits).

3. Device-specific, e.g. special diagnostic information.

All three parameter groups are recorded by means of slow, acyclic reading us-

ing SIMATIC PDM or a HART handheld terminal.

The measured value is mapped by a 4...20 mA signal. The A/D or D/A con-

version takes place on the HART analog module. This process value is proc-

essed by means of fast cyclic reading/writing by the automation terminal. In

exceptional cases, certain parameter groups are also written or read acyclically

by the programmable controller/system.

3.2.4 DMF and EDD descriptions

What is the DMF? The DMF stands for device master file

This file contains the device master data, with which a configuration of the

PROFIBUS PA field devices is possible in the SIMATIC S7 automation sys-

tem and in the PCS 7 process control system.

The DMF is an ASCII text file, in which the general and device-specific com-

munication features of a PROFIBUS device are described with the aid of

obligatory and optional key words. Manufacturer and profile identification

numbers increase configuration security and simplify the interoperability of the

devices. The DMF describes all the major parameters for the cyclic communi-

cation.

Each manufacturer of PROFIBUS PA field devices supplies a device master

file with their devices. These are to be read into the engineering station and

updated in the COM PROFIBUS or STEP7 program package in the HW-

04.2005 3 Description of the Components

SIMATIC Field Automation

3–15

Config program section. Further information on this topic can be found in

/231/

What is the EDD? The electronic device description (EDD) is a universal, standardized device

and parameter description for PROFIBUS PA and HART-compatible field de-

vices. SIMATIC PDM is supplied with device data from the contents of the

device description.

For tasks based on acyclic communication, such as

• Engineering,

• Commissioning,

• Diagnostics,

• Measured value monitoring,

• Asset management or

• Documentation,

the EDD, which is created by the device manufacturer using the powerful elec-

tronic device description language EDDL, supplies the necessary device in-

formation. The EDD can be used for both simple and complex devices.

Together with powerful SIMATIC PDM process device manager it standard-

izes the user interface and user prompting. It is easy to generate and requires

no special knowledge. When generating the EDD, existing EDDs, profile de-

scriptions and text libraries can also be integrated.

3.2.5 Driver function blocks for field automation

Introduction In order to transfer process data between the I/Os and the user program, field

device blocks are needed. These field device blocks provide the interface to the

hardware, including verification functionality.

Detailed information on parameter assignment for blocks can be found in

/258/, Chapter 5.

Block types are integrated in PCS7 in the form of block libraries. You can also

create your own block types as required. The following reference manuals are

available:

• Basic Blocks Library /258/

• Technological Blocks Library /259/

• Field Device Blocks Library /260/

The existing set of block types can be extended if necessary. We recommend

the use of the basic blocks and reference manual /258/, in which the block con-

cept is described in detail (Chapter 2).

Field device blocks The scope of blocks used in the SIMATIC PCS 7 automation system is very

extensive and varied. We therefore refer you at this point to the document: Li-

brary of Field Device Blocks /260/.

SIMATIC Feldautomatisierung 4–1

Catalog Data

This chapter contains

4.1 Ordering Data 4–2

4.2 Cross-References to Detailed Catalogs 4–2

4.3 Positioning in the Information Environment 4–3

04.2005 4 Catalog Data

SIMATIC Field Automation

4–2

4.1 Ordering Data

Ordering data Order number

Drivers (Basic Blocks Library) 6ES7 863 - 2DA00 - 0XX0

PA drivers (field device blocks library) 6ES7 863 - 5DA00 - 0XX0

SIMATIC PDM, BASIC V6.0 (4 TAGS) 6ES7 658 - 3AX06 - 0YA5

SIMATIC PDM, INTEGRATION IN

STEP 7/PCS 7

6ES7 658 - 3BX06 - 2YB5

SIMATIC PDM, option packages according to

engineering and plant structure

6ES7 658 - 3BX06 -

DP/PA coupler, intrinsically safe version 6ES7 157 - 0AD82 - 0XA0

DP/PA coupler, non-intrinsically safe version 6ES7 157 - 0AC82 - 0XA0

DP/PA link (IM 157) 6ES7 157 - 0AA82 - 0XA0

Analog input ET200M SM 331 AI 2 x HART 6ES7 331 - 7TB00 - 0AB0

Analog output ET200M SM 332 AO 2 x HART 6ES7 332 - 5TB00 - 0AB0

RS 485-IS coupler 6ES7 972 - 0AC80 - 0XA0

ET 200iSP interface module IM152-1 6ES7 152 - 1AA00 - 0AB0

Analog input ET200iSP 4 AI I 2WIRE HART 6ES7 134 - 7TD00 - 0AB0

Analog input ET200iSP 4 AI I 4WIRE HART 6ES7 134 - 7TD50 - 0AB0

Analog input ET200iSP 4 AO I HART 6ES7 135 - 7TD00 - 0AB0

4.2 Cross-References to Detailed Catalogs

Catalog Catalog content Order No.

ST 50 SIMATIC automation systems

SIMATIC S5/505

Available as PDF download:

http://www2.automation.sieme

ns.com/simatic/ftp/st50/

html_00/st5098_d.pdf

ST 70 SIMATIC S7

Products for Totally Integrated Automation and

Micro Automation

E86060-K4670-A111-A9

ST 80 SIMATIC HMI

Operator control and monitoring systems

E86060-K4680-A101-B3

IK PI Industrial Communication

for Automation and Drives

E86060-K6710-A101-B4

FI 01 Field devices for process automation E86060-K6201-A101-A6

FS10 Sensor Technology

Factory Automation Sensors

E86060-K8310-A101-A1

PC-based Automation E86060-K4670-B111-B2

KT 10.1

SITOP power – power supplies,

LOGO!Power

E86060-K2410-A101-A5

KT 10.2 System cabling

SIMATIC TOP connect

E86060-K2410-A201-A3

ST PCS 7 SIMATIC

Process control system SIMATIC PCS 7

E86060-W4678-A111-A8

ST PCS 7.A Add-ons for the SIMATIC PCS 7

process control system

E86060-K4678-A121-A4

CA 01 Components for automation E86060-D4001-A100-C3

The latest catalogs are available on the Internet:

http://www.automation.siemens.com/order_formular/html_00/resoform.asp

04.2005 4 Catalog Data

SIMATIC Field Automation

4–3

4.3 Positioning in the Information Environment

To support your configuration, there is extensive user documentation intended

for selective utilization. The following explanations are designed to facilitate

utilization of the user documentation.

Title Table of Contents

Process Control System

PCS 7

Configuration Manual

This description provides an overview of components and functionality

of the SIMATIC process control system 7, and contains the system

topics of interest for operating a control system.

A5E00164233-02; A5E00058932-04

Programming with

STEP 7

Manual

The STEP 7 Manual explains the basic utilization and functions of the

STEP 7 programming software.

A5E00261252-01

System software for

S7-300/400

System and standard

functions

Reference Manual

The S7-CPUs contain the system and standard functions integrated in

the operating system which you can use in programming. The manual

provides an overview of the functions and organization blocks

available as a basis with S7, as well as detailed interface descriptions in

the form of reference information, for utilization in your user program.

A5E00261259-01

CFC for S7

Manual

The manual for the CFC configuring tool (in the PCS 7 engineering

package) provides an overview and instructions for the procedure in

creating an overall software structure from prepared blocks.

When working with the software, you can use the online help which

answers your detailed questions on utilizing the CFC editor.

A5E00177296-01

SFC for S7

Manual

The manual of the SFC I&C package provides the information needed

for configuring sequence controllers.

When working with the software, you can use the online help which

answers your detailed questions on utilizing SFC.

A5E00177374-01

Reference manuals of the

block libraries

The "Basic blocks", "Field device blocks" and "Technological blocks"

manuals contain detailed information on the blocks of the libraries.

Blocks: A5E00180694-02

Driver blocks: A5E00180696-02

Library: A5E00180680-02

WinCC

Basic documentation

Manual

The manual provides information you require for configuring and

working with the HMI system and includes descriptions of the hard-

ware, software and process control.

A5E00221788

Bus links

DP/PA link and Y-link

Device Manual

This manual describes the hardware of the PROFIBUS link DP/PA in

detail. It allows you to put bus links into operation.

A5E00193840-14

Automation systems

S7-300, ET200M

Ex IO modules

Reference Manual

Chapter 4 of the reference manual describes the HART analog mod-

ules. It enables you to put the modules into operation.

A5E00172006-07

Distributed IO device

ET 200M

Manual

This manual describes the design of the distributed IO device ET200M.

It contains the description of the module IM 153-2 that is requires for

the use of the HART modules.

EWA-4NEB780600601-06

Distributed IO device

ET 200iSP

Manual

This manual contains instructions on configuring, installing, wiring,

commissioning, diagnosing and maintaining the ET 200iSP, including

the associated HART analog modules.

A5E00247482-02

Profibus RS485-IS User

and Installation Guideline

2.262 (PI)

These guidelines describe the configuration of RS485-IS networks in

hazardous areas.

http://www.profibus.com/

04.2005 4 Catalog Data

SIMATIC Field Automation

4–4

SIMATIC PDM

Process Device Manager

Manual

This manual gives you a complete overview of programming with

SIMATIC PDM. It supports you with the installation and commission-

ing of the software. It explains the procedures for configuring net-

works, commissioning and runtime functions.

The manual is aimed at those who work in field technology for the con-

figuration, commissioning and operation of plants.

A5E00210345-01

The latest versions of the manuals are available on the Internet at:

http://www2.automation.siemens.com/simatic/portal/html_00/techdoku.htm

SIMATIC Feldautomatisierung

Part 2 Configuring and Startup

5 INSTALLATION GUIDELINES 5–1

5.1 Introduction 5–2

5.2 Mechanical and Electrical Installation 5–5

5.2.1 Installing the cables 5–5

5.2.2 Cable routes within buildings and outside buildings 5–5

5.2.3 Cable specifications and cable recommendation PROFIBUS DP 5–7

5.2.4 Cable specifications and cable recommendation PROFIBUS PA 5–9

5.2.5 Shielding concept 5–9

5.2.6 Grounding and equipotential bonding 5–11

5.2.7 Lightning protection 5–11

5.2.8 Connectors 5–12

5.2.9 Installation materials and tools 5–13

5.3 PI (Profibus International) Guidelines and other References 5–16

6 HARDWARE CONFIGURING (PROJECT EXAMPLE) 6–1

6.1 Configuring a Station 6–3

6.1.1 Creating a station and starting the hardware configuration 6–4

6.1.2 Configuring the station 6–5

6.1.3 Loading the hardware configuration into a CPU 6–6

6.2 Distributed I/O PROFIBUS DP/PA 6–7

6.2.1 Inserting a DP slave in a station 6–7

6.2.1.1 Device data (Device master file) 6–7

6.2.1.2 Using a SITRANS P via a DP/PA coupler 6–7

6.2.1.3 Using an ET 200iSP with a HART module 6–8

6.3 Station Diagnostics 6–9

6.4 SITRANS P Parameter Assignment with SIMATIC PDM 6–10

7 SOFTWARE CONFIGURING (PROJECT EXAMPLE) 7–1

7.1 Project Example: Control Loop (CFC) 7–2

8 REFERENCE LITERATURE 1

9 INDEX 1

10 GLOSSARY 1

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5–1

Installation Guidelines

This chapter contains:

5.1 Introduction 5–2

5.2 Mechanical and Electrical Installation 5–5

5.2.1 Installing the cables 5–5

5.2.2 Cable routes within buildings and outside buildings 5–5

5.2.3 Cable specifications and cable recommendation PROFIBUS DP 5–7

5.2.4 Cable specifications and cable recommendation PROFIBUS PA 5–9

5.2.5 Shielding concept 5–9

5.2.6 Grounding and equipotential bonding 5–11

5.2.7 Lightning protection 5–11

5.2.8 Connectors 5–12

5.2.9 Installation materials and tools 5–13

5.3 PI (Profibus International) Guidelines and other References 5–16

04.2005 5 Installation Guidelines

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5–2

5.1 Introduction

General The characteristic feature of a bus system is that many

stations can communicate with each other with a low cabling overhead.

Another important criterion is the possibility of expanding existing plant

sections without having to modify available structures. This criterion is met by

PROFIBUS PA.

The versatile system configuration of PROFIBUS PA allows optimal

adaptation of the field cabling to the local circumstances of the industrial plant.

Fehler!

SIMATIC S7-400

Star

T splitter

Termin.

resistor

Line

DP/PA link

Ex-area Zone 1

Non-Ex area

PROFIBUS PA backbone (EEx e)

Ex Hub-i

Ex Hub-iPlus

Subsequent

system expansion

via T splitter

PROFIBUS DP

PROFIBUS PA

DP/P

coupler

Non-Ex

1000 m

Fig. 5-1 Topology of PROFIBUS PA

Connection system The field devices are connected to the bus line using T splitters and hubs

(connection box).

In practice, a distinction is made between the following arrangements:

• Bus line from DP/PA coupler or DP/PA Link to the field devices and star-

configuration cabling on-site.

• Connection of field devices with T splitters and hubs along the bus line.

04.2005 5 Installation Guidelines

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5–3

• Use of Ex hubs for connecting intrsinsically-safe devices to the non-

intrinsically-safe DP/PA coupler in order to increase the number of

devices on the PA bus in the Ex area.

Star / field distributor

(e.g. for 3 field devices)

T branch

Fig. 5-2 Connection diagram for field devices on PROFIBUS PA

Number of field- By means of the DP/PA coupler or DP/PA link, up to 9 field devices

devices can be powered on a PROFIBUS PA segment (shielded two-wire cable) in

the Ex area and up to 31 field devices in the non-Ex area.

By using Ex hubs, the number of field devices in the Ex area can be increased

to a maximum of 31 on a non-Ex PA segment.

Cable lengths The following cable lengths can be achieved regardless of the distribution

and number of PROFIBUS PA devices /605/:

• Ex version: 920m

• Non-Ex version: 560m

Depending on the distribution and number of PROFIBUS PA devices and their

actual power consumption, the PROFIBUS standard permits the following

maximum lengths:

• Non-Ex and Ex[ib] (Ex hubs) version:

Total length per segment max. 1900 m.

Number of bus nodes Length of spur line

1 – 12 120 m

13 – 14 90 m

15 – 18 60 m

19 – 24 30 m

• Ex[ia] version: Total length per segment max. 1000 m.

Number of bus nodes Length of spur line

1 – 24 30 m (FISCO)

Power requirements Every field device on the PROFIBUS PA draws a static quiescent current of

typically 12 mA

04.2005 5 Installation Guidelines

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5–4

from the DP/PA coupler or DP/PA link via the data cable. In practice the

current consumption is between 10 and 30 mA, depending on the field device.

Field devices with lower power consumption such as pressure, temperature or

level transducers utilize this quiescent current as their own power supply. The

total quiescent currents of all stations is limited to 110 mA in the Ex area and

1000 mA in the non-Ex area.

PROFIBUS DP

SIMATIC S7-400

PROFIBUS PA

31.25 kbit/s Ω

100

F 1

Two-core, shielded

cable, total

length max. 1,900 m

< 100 mA

(Type of protection: [EEx ib],

explosion group: IIC)

≥ 10 mA ≥ 10 mA

≥ 10 mA

≥

10 mA

24 V

Supply of field devices:

Ex area: max. 10

Non-Ex area: max. 30

Spur line

max. 30 m

DP/PA link

Fig. 5-3 PROFIBUS PA supplying the field devices

Transmission type- Data is transmitted by modulating the quiescent current with

current signals of +/- 9 mA. The design of the Ex version of the DP/PA cou-

pler or DP/PA link in accordance with [EEx ia] IIC allows the use of field de-

vices in Zone 0 (5% of all applications in the Ex area) and Zones 1 and 2 (both

accounting for 95% of all applications in the Ex area).

Installation site The DP/PA coupler and DP/PA link are referred to as "associated apparatus"

with an intrinsically-safe circuit (PROFIBUS PA) that is installed outside the

Ex area.

Installation Simple and rugged installation:

• Two-wire line with shield

• Connection by means of terminals, no soldering

• Field devices can be replaced during operation

Hub technology Thanks to the electrical isolation of intrinsically-safe and non-intrinsically-safe

PROFIBUS PA,

the Ex hub makes it possible to also operate non-intrinsically-safe devices via

the non-intrinsically-safe DP/PA coupler in the DP/PA Link and thus to work

with higher supply voltages and currents (1000 mA). This greatly increases the

number of devices that can be connected per bus segment in the Ex area.

You can find more information on Ex hub technology in the Catalog ST PCS

7.A Add Ons for the SIMATIC PCS 7 Process Control System.

04.2005 5 Installation Guidelines

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5–5

5.2 Mechanical and Electrical Installation

5.2.1 Installing the cables

Installation When installing the cables, ensure that they are not twisted, kinked,

stretched, or crushed!

Applying the shields Shielded cables (braided shield) are recommended for the bus cable.

This recommendation also applies to any supply cables from external power

supplies to PROFIBUS devices (such as repeaters).

Double-shielded cables are particularly suitable for environments subject to

electromagnetic interference. To ensure optimal protection, the outer shield

(braided shield) and the inner shield (foil shield) at both cable ends must make

large-area contact to ground with a grounding clamp.

Where bus cables are inserted into electronics cabinets, the outer shield is

additionally given large-area contact to a shield bus to improve the diverting of

radio-frequency interference. The cable insulation should be stripped over the

width of the clamp by means of a cable knife without damaging the braided

shield. The shield bus must have good electrical connection with the cabinet

ground (screw-fitting with a toothed lockwasher).

For industrial areas subject to extreme electromagnetic interference

(converters), laying of the cable within a steel pipe or sheet-steel duct is

mandatory. The pipe or duct must have multiple grounding at various points. A

fiber optic bus can be used as an alternative.

Securing the cables Bus cables must be mechanically secured at a distance of ≤ 1 meter from

the terminal of the connected device (by means of a cable tie or clamp, for

example). The device terminals generally serve only to divert the interference

currents (shield contact) and cannot counteract vertical or horizontal tensile

forces.

Equipotential bonding Where circulating currents via the shield are expected to be higher than

permitted by the cable manufacturer, an additional equipotential bonding

conductor (≥ 10 mm2 copper) should be laid to the bus cable, parallel if

possible.

Note:

Particular attention must be paid to VDE 0165 Section 5.3.3. for operation in

Ex zones. It specifies that in Ex zones and with more than one ground point,

equipotential bonding is mandatory.

5.2.2 Cable routes within buildings and outside buildings

Installing the cables Shielded bus cables must be laid at a distance of at least 200 mm from

supply and high-voltage cables of more than 60 volts. With severe interference

sources (welding transformer, switched motors, etc.), the distance must be

increased to at least 500 mm.

Installation next to telecommunications cables should be avoided because

mutual interference cannot be ruled out. Installation next to signal cables for

measurement and control with signal voltages of ≤ 60 volts is possible without

problems.

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Routing on cable racks and through channels is permissible. Adequate

grounding must be ensured. Even short spur cable racks or steel conduits must

be grounded.

Protection against Where there is risk of mechanical damage (friction, walkways) special

damage protection must be provided (closed sheet metal duct or conduit).

If no cable racks, channels or ducts are available, the cable must be installed in

a conduit. This must be marked accordingly to prevent other cables from being

drawn in later. At expansion joints of the building, the conduit may be

interrupted for a maximum of 500 mm provided the cables cannot be damaged

by falling parts. At specially protected locations (electronics rooms), the cables

may be installed without conduit. The subsequent pulling-in of bus cables into

an occupied conduit is not permissible on account of the risk of mechanical

damage.

Storage and During storage, transportion and laying, ensure that both ends of the bus

transportation cable are sealed with caps or insulating tape. This prevents the ingress of

moisture and dirt.

Laying of cables In the ground, a cable must be laid in conduits or duct blocks. With direct

in the ground laying, the cable must be covered with an additional protective layer of sand

to protect it against damage. The manufacturer's specifications relating to the

suitability of the particular cable for burying in the ground must be observed.

Some manufacturers assign a particular color to the cable to facilitate

identification (for example, gray cable within buildings and black cable outside

buildings and in the ground).

For protection against the effects of lightning strikes, a 70 mm2 copper cable or

40 x 5 mm steel strip must be laid about 0.5 m above a cable routed

underground (covered with sand or in a PVC conduit).

Permissible bending radius Particularly with fiber-optic cables, the bending

radius must not be lower than the minimum value specified by the

manufacturer. For example, the bending radius applying to the SIMATIC NET

PROFIBUS plastic fiber cable is ≥ 35 mm, and ≥ 150 mm for the

corresponding glass fiber cable. The corresponding tensile strengths must also

not be exceeded (10 N and 500 N respectively for the cables mentioned

above).

The following guide value applies for copper cables with a plastic sheath:

Laying radius = 12 x cable diameter.

Maximum tensile stress (guide value) is 100 N.

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5.2.3 Cable specifications and cable recommendation PROFIBUS DP

Cable specification

Cable type Twisted-pairs 1 * 2 or 2 * 2 or 1 * 4 (star

quad), shielded

Impedance nom. 120 Ω, min. 100 Ω, max. 130 Ω, f >

100 kHz

Cable capacitancet typ. < 60 pF/m

Core cross-section min. 0.22 mm2, corresponds approx. to

AWG 24

Signal attenuation max. 9 dB1 over entire length of cable

section corresponding to 1200 m

100 kbit/s [RS 422A] or approx.

0.75 dB/100m f = 100 kHz

Shielding Apart from good HF characteristics, ensure

that the shield can be correctly connected.

Wrapped shield foil is not suitable. If

possible, use aluminum foil and copper braid

or at least copper braid.

Table 5-1: Cable specification

Cable recommendation The search for suitable cables with the above specifications was unexpectedly

difficult. The RS485 signal standard was originally created for transmitting on

telephone cables with 120 Ω impedance. These are frequently used without

shielding. Where they are shielded, it is usually static which explains the types

with aluminum foil and contact wire. However, the advent of ISDN networks

resulted in a general need for telephone cables with HF shielding.

Two-wire data transmission right up to the highest frequency ranges has

developed greatly in recent years in the form of LANs (local area networks). In

newer buildings, LAN-capable universal cables are pre-installed in the

infrastructure. Unfortunately, the excellent cables developed for this purpose

can hardly be used for PROFIBUS because the impedance of this network

cable is a standard 100 Ω. Although this value is precisely at the limit of the

PROFIBUS specification, the negative tolerance range of -10 % to -15 % can

cause unacceptable reflections with a terminating resistance of 120 Ω. The

table below includes only cables with an impedance complying with the

specifications.

1The PROFIBUS standard specifies 6 dB here, adopted from the quoted standards including CCITT V.11. The max.

cable length of 1000 m mentioned therein is assumed to have a max. signal attenuation of 6 dB between transmitter and

receiver. The specified test set-up with a twisted telephone cable of 0.51 mm diameter copper and 100 Ω terminating

resistance already results in a resistive attenuation of 8.6 dB.

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Cable list The data in this list have been taken from the data sheets.

The list is only intended to provide an overview and therefore does not

represent the full range of cables.

Manufacturer/sale Cable type Impedance Cable type

(standard

designation)

Capacitance

in operation

1kHz

Attenuation Shielding Remarks

Siemens AG SIMATIC

NET

6XV1 830-

0EH10

150Ω ± 15Ω

3 ... 20 MHz

02YSY (ST) CY

1 x 2x 0.64/2.55-

150 KF 40 FR VI

approx. 28

nF/km

<4 dB/km

bei 38.4 KHz

Al.-clad

foil +

Cu braid

Bus cable

Standard with

PVC sheath

Siemens AG SIMATIC

NET

6XV1 830-

3FH10

150Ω ± 15Ω

3 ... 20 MHz

02YSY (ST)

CY2Y

1 x 2 x 0.64/2.55-

150 KF 40 SW

approx. 28

nF/km

<4 dB/km

bei 38.4 KHz

Al.-clad

foil +

Cu braid

Bus cable

Buried cable

Siemens AG SIMATIC

NET

6XV1 830-

0GH10

150Ω ± 15Ω

3 ... 20 MHz

02YSY (ST) CY

1 × 2 × 0.64/2.55-

150 KF 40 FR VI

approx. 28

nF/km

<4 dB/km

bei 38.4 KHz

Al.-clad

foil +

Cu braid

Bus cable with

PE sheath (food

& beverages)

Siemens AG SIMATIC

NET

6XV1 830-

3EH10

150Ω ± 15Ω

3 ... 20 MHz

02YY (ST) C11Y

1 x 2 x 0.64/2.55-

150 LI KF 40 FR

petrol

approx. 28

nF/km

<4 dB/km

bei 38.4 KHz

Al.-clad

foil +

Cu braid

Bus cable for

use as trailing

cable

Siemens AG SIMATIC

NET

6XV1 830-

3GH10

150Ω ± 15Ω

3 ... 20 MHz

02Y (ST) CY

1 x 2 x 0.65/2.56-

150 LI petrol FR

approx. 28

nF/km

<4 dB/km

bei 38.4 KHz

Al.-clad

foil +

Cu braid

Bus cable for

festoons

Table 5-2: List of copper cables

Manufacturer/sales Cable type Fiber type Cable type

(standard

designation)

Material

attenuation

Operating

temperature

Remarks

Siemens AG 6XV1 873-

Multimode

graded-index

fiber 50/125

AT-W(ZN)YY

2x1G50/125

at 850nm

≤ 2.7dB/km

at 1300nm

≤ 0.7dB/km

–25 ºC to +80 ºC

FO standard cable for use

indoors and out

Siemens AG 6XV1 820-

5AH10

Multimode

graded-index

fiber 62.5/125

AT-VYY

2G62.5/125

3.1B200 +

0.8F600 F

at 850nm

≤ 3.5dB/km

at 1300nm

≤ 0.8dB/km

–20 ºC to +60 ºC

Fiber optic cable for use

indoors and out

Siemens AG 6XV1820-

6AH10

Multimode

graded-index

fiber 50/125

AT-

W(ZN)Y(ZN)11

Y 2G50/125

at 850nm

≤ 2.7dB/km

at 1300nm

≤ 0.7dB/km

–25 ºC to +80 ºC

Cables for use in trailing

cables for high mechanical

stress

Siemens AG 6XV1820-

7AH10

Multimode

graded-index

fiber 62.5/125

T-VHH

2G62.5/125

3.2B200+0.9F6

00 F TB3 OR

FRNC

at 850nm

≤ 3.5dB/km

at 1300nm

≤ 1.0dB/km

–20 ºC to +60 ºC

Tread-resistant, halogen-free

and non-inflammable cable

for use indoors

Siemens AG 6XV1873-

3GTٱٱ

Multimode

graded-index

fiber 50/125

AT-

WQ(ZN)Y(ZN)

B2Y 2G50/125

at 850nm

≤ 2.7dB/km

at 1300nm

≤ 0.7dB/km

–25 ºC to +70 ºC

Longitudinal and lateral

water-tight cable for use

outdoors with non-metallic

protection against rodents, for

direct routing also

underground

Table 5-3: Fiber optic cable list

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5.2.4 Cable specifications and cable recommendation PROFIBUS PA

Cable specification According to EN 61158-2, a two-core cable is prescribed for fieldbuses.

The electrical data are not specified although they govern the achievable

characteristics of the fieldbus (possible distances, number of stations,

electromagnetic compatibility). In the standard (Annex C, not for

standardization, for information only) a distinction is made between four cable

types.

Installations according to the FISCO model are not subject to any safety

restrictions if defined limit values are observed. Operation outside these limit

values is generally excluded but requires consideration of individual cases.

The cores of all fieldbus cables must be clearly selectable (for example, with

color coding or ring marking). Cables with intrinsically safe circuits must be

marked according to DIN 57 165/VDE 0165, Section 6.1.3.14 (for example,

with a light-blue sheath).

Where multi-pair cables are used in the hazardous area, the special installation

conditions of DIN 57 165 / VDE 0165 (Chapter 6) /8/ must be observed.

Cable recommendation The reference cable (Type A) must be used for conformance tests.

For the new installations of plants, the cables used must meet the minimum re-

quirements of Type A or B. With multi-pair cables (Type B), two or more

fieldbuses (31.25 kbit/s) may be operated in one cable. Other circuits on the

same cable must be avoided.

Cables of Type C and D must only be used in retrofit applications (use of

already installed cables) with a greatly reduced network size. In these cases,

allowance should be made for the fact that the interference immunity of

transmission often does not meet the requirements described in the standard.

Cable list The data in this list have been taken from the data sheets.

The list is only intended to provide an overview and therefore does not

represent the full range of cables.

Manufacturer/

sale

Cable type Impedance Cable type

(standard

designation)

Capacitance

in operation

Attenuation Shielding Remarks

Siemens AG SIMATIC

NET

6XV1 830-

5EH10

100Ω ± 20Ω

02 Y SY CY

1 x 2 x

1.0/2.55-100

BL OE FR

<28 nF/km <3 dB/km

38.4 KHz

Cu braid

Siemens AG SIMATIC

NET

6XV1

830-5FH10

100Ω ± 20Ω

02 Y SY CY

1 x 2 x

1.0/2.55-100

BL OE FR

<28 nF/km <3 dB/km

38.4 KHz

Cu braid

Table 5-4: List of copper cables

5.2.5 Shielding concept

To shield or not to shield EN 50170 Vol. 2 allows the user to decide whether to employ shielded

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cables. Unshielded cables are permissible in an interference-free environment.

On the other hand, there is the following argument for always using shielded

cables:

• An "interference-free" area exists, if at all, only in the interior of shielding

cabinets. However, as soon as relays and switching contactors are installed

in them, the protection is lost.

Shielding rules For optimum electromagnetic compatibility of systems, it is very important

that the system components and, in particular, the cables are shielded, and that

these shields form a sheath that is as electrically seamless as possible.

To quote the "Grounding, shielding" Section of the DIN standard: "When a

shielded bus cable is used, it is recommended that the shield be connected to

protective grounds with low inductance at both ends, to achieve the best

possible EMC. Separate potentials (e.g. in a refinery) are an exception; as a

rule, only single-ended grounding is permitted in these cases.

Note:

In systems without equipotential bonding, circulating currents at line

frequency can damage the bus cable in unfavorable cases (by exceeding the

permissible shield current). In these systems, therefore, the cable shield should

be directly connected to the building ground at one end only.

The connection between the shield and protective ground (unit housing, for

example) should preferably be made via the metal housing and the screw-type

connection of the sub D connectors. Where this type of shielding is not

possible, grounding can be achieved via pin 1 of the connector."

It should be noted, however, that the connection via pin 1 does not meet the

"low-inductance" condition. With a view to EMC, it is better to expose the

cable shield at a suitable point and ground it to the (metal) structure of the

cabinet with the shortest possible cable connection (for example, with a shield

clamp in front of the connector).

Shield connection By far the most important location for connecting the shield ground is at

the point where the bus cable enters the control cabinet. Longer external cables

are frequently routed via terminals here. For the shield connection to meet the

"low-inductance" requirement, the following must be observed:

Note:

The cable shield must make contact over its circumference and have a large-

area connection to the grounded structure (for example, ground bus, terminal

rail).

Here are the most common mistakes resulting in non low-inductance

grounding:

• Connection via a sheath wire or contact wire.

• Connection via a short length of stranded conductor (a few cm), soldered

on or crimped on ("pigtail method").

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• Opening up or unsplicing the cable shield and clamping it directly in a

ground clamp. If the resultant ground wire is not longer than about 2 cm,

this method is conditionally permissible.

• Routing of shield grounds via lengths of stranded copper conductor, even

with large cross-sections (1.5 mm2 Cu).

With proper clamping of the cable shield by means of a cable clamp or other

clamping device, adequate contact pressure must be ensured. The clamping

pressure is often exerted against the cable's insulation which creeps in the

course of time. Such arrangements require very great spring travel! The shield

connection terminal of Weidmüller's KLBÜ series is a constructive response to

this problem.

5.2.6 Grounding and equipotential bonding

Protective grounding The protection concept of the station supply governs the need for protective

grounding of a bus station. Consult the manufacturer's data and local

specifications.

Equipotential bonding The RS485 bus segment with 2 to 32 transceivers (transmitter/receiver

modules) is electrically throuogh-connected. Light equipotential bonding is

therefore always provided by the bus cable. The question is whether additional,

lower-resistance equipotential bonding is necessary, as specified in the RS 485

standard.

2-wire line With a two-wire line, there is only light equipotential bonding.

Electrical isolation of the transceiver from the station with its other potential

connections is unavoidable for fault-free data transmission.

4-wire line With a four-wire line, equipotential bonding is provided by the DGND

conductor. This arrangement does not depend on electrical isolation of the

transceiver. If the DGND is grounded with two or more stations, excessive

circulating currents can flow on the bus cable. For this case, RS485 specifies a

series resistance of about 100 ohms per station. Although this resistance

provides protection from excessive circulating currents, it reduces the

equipotential effect. Isolation of the transceiver is advantageous, even with

equipotential bonding.

Conclusion Equipotential bonding according to RS 485 is only necessary when there

is no isolation of transceivers from other potential connections (such as

grounded supply, great capacitive coupling of an ungrounded supply).

Area subject to This is an area in which the risk of explosion or a hazardous explosive

explosion hazard atmosphere can develop as a result of local operational conditions.

According to the classification of this area, there are special requirements for

the use of electrical apparatus. Further explanations and instructions can be

found in VDE 0165 and /519/.

5.2.7 Lightning protection

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Lightning protection is subdivided into external and internal protection. Where

bus cables are routed only within a building, only the internal lightning

protection need be taken into account.

External lightning protection External lightning protection always refers to the (bus) cables routed

to the plant sections located outside the building.

Where cables are laid in PVC or PE tubes, a grounding cable must be laid

about 0.5 m above the cables (at least 70 mm2 copper cable or 40 x 5 mm steel

strip). The copper cable or steel strip must be grounded at each entrance to the

building.

Bus cables laid above ground must be routed in a closed steel conduit or sheet

steel duct. Both the conduit and the duct must be grounded at least at the

beginning, at the end and at each entrance to the building.

Internal lightning All electrical and metal parts (cables, pipes, etc.) leading into a building

protection must be incorporated into the equipotential bonding for lightning protection

This means that all pipes (gas pipes, water pipes, cable conduits, etc) must be

directly connected to the equipotential bonding rail at the entrance to the

building. The cores of power cables are connected to the equipotential bonding

rail via lightning arresters. This relates to EDP and bus cables as well as low-

voltaeg cables.

5.2.8 Connectors

PROFIBUS DP 9-pin sub D connectors are used as the connection medium for the bus cable

(and for connecting PROFIBUS PA to the DP/PA coupler). The connection

between core and socket or pin should be a screw terminal or soldered joint.

The cases of the sub D connectors should preferably be metal or metalized to

ensure EMC, also at the connector. Connectors should be secured to the

interface or station b yan electrically conductive screwed connection.

DIN 41652,Part 1, applies to mechanical and electrical properties of 9-pin

sub D connectors.

PROFIBUS PA PA terminals are used as teh connection medium for the bus cable between

the individual field devices. The connection between core and socket or pin

should be a screw terminal or soldered joint. The cases of the PA terminals

should preferably be metal or metalized to ensure EMC, also at the PA

terminal.

Note

It is not recommended that PROFIBUS PA be looped-through via the

individual field devices. Subsequent replacement of only one field device can

result in a breakdown of bus communication.

Sub D connectors with Soldering work must be done cleanly and carefully. Additionally, a local

solder terminals 220/230-V outlet is needed for the soldering iron.

Sub D connectors with solder terminals are very common and are available

from various manufacturers.

Sub D connectors with The crimping operation is relatively critical and can only be carried out

crimp terminals with a special tool. If improperly created, crimp contacts can slip out of

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their seat and impair the reliability of a connection. However, the work can be

carried out by one person. For production in a workshop, an automatic

crimping machine can considerably facilitate and accelerate the work

(stripping and crimping in one operation).

Sub D connectors Apart from the screwdriver and stripping tool, no other aids are needed. As

with screw terminals with modular terminals, screw connections are less subject to faults and

considerably easier to make than a soldered joint. No power is needed for a

soldering iron, nor is there any need for assistance by a second person. At

present, however, there are few providers of this simple connection system

(such as Phoenix Contact, Siemens, etc.).

Connectors for higher 9-pin sub D connectors are not suitable for use in a harsh environment and

degrees of protection in environments with higher degrees of protection. For these applications,

(IP65) there are circular connectors made of metal which meet the higher

requirements.

Another possibility is to provide the plug-in connection in a suitable housing

and ensure the degree of protection at the cable bushings by means of suitable

heavy-gauge threaded joints. (Interfaces or stations in IP65 housings)

5.2.9 Installation materials and tools

Tools for In general, no special tools are required for fitting the copper bus cables.

copper cables

Tools for No particular tools are required for fitting the fiber-optic cables. However,

Fiber optics the following additional points must be noted:

• The individual companies provide cables, usually prefabricated, for

connecting the FO components. These cables require no further treatment.

• Where connectors must be fitted to the glass FO cables on site, there are

special splicing methods (mechanical or thermal) with which the

connectors can be properly clamped on. Splicing is normally undertaken

by trained specialists because maximum accuracy and cleanliness are es-

sential Connectors can be fitted to FO cables or direct connections can be

made between FO cables.

• Some companies offer special installation cases containing the necessary

tools and materials Sometimes a microscope is needed in addition to the

installation case.

• For simple connections, there are so-called finger splices FO cables can be

easily interconnected (without special tools) by means of mechanical self-

alignment in the splice.

• Plastic FO cables can be preassembled without problems at the plant.

Installation materials Ground cables are normally connected direct to the supporting metal

structure with bolts (M6/M8/M10). To ensure a good contact, toothed lock

washers are inserted between the painted metal and the nut or cable lug. Bolts,

nuts and lock washers are therefore required as well as cable lugs.

The flexible cores of the signal cables are inserted into the terminals of the

PROFIBUS components with ferrules.

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The shields are connected to the metal structure by means of large-area cable

clamps. Suitable cable clamps are therefore needed for the cables. It should be

noted that the shield creeps under the cable clamps. This means that a

tightened cable clamp becomes slack after a certain time and may no longer

provide large-area contact with the shield. Either the clamps must all be

retightened after about six months, or spring-loaded clamps are used to

compensate for cable creep.

The sizes of the bolts, nuts, toothed lock washers, cable lugs, ferrules and cable

clamps to be procured are determined by the cross-sections of the cables and

lines used.

FastConnect® The system consists of the following coordinated components:

• FastConnect bus cables for quick assembly

• FastConnect stripping tool

• FastConnect bus connector for PROFIBUS

The FastConnect stripping system enables PROFIBUS connectors to be

connected quickly and simply to the PROFIBUS bus cables. The special

design of the FastConnect cables enables use of the FastConnect stripping

tools, with which the outer sheath and shielding braid can be accurately

removed in one step. With the help of the FastConnect stripping tool, it is

possible to strip the outer sheath and shield of the FastConnect bus cables to

the correct lenghts in one step. The cable prepared in this way is connected in

the FastConnect bus connectors using the insulation displacement method.

The PROFIBUS FastConnect bus cables can also be connected to the

conventional bus connectors.

SpliTConnect® This system is used for setting up PROFIBUS PA fieldbus segments in

accordance with IEC 61158-2 with field device connection points. It comprises

the connection elements tap, M12 outlet, M12 jack, coupler and terminator for

connencting the terminal devices to the FastConnect process cable.

Fig. 5-4 SpliTConnect® connection system

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SpliTConnect has the following advantages:

• Simple mounting of the bus cable thanks to the FastConnect system

(FastConnect stripping tool, FC process cable in accordance with IEC

61158-2)

• FC process cable: Special bus cable in accordance with IEC 61158-2 for

use in areas subject to explosion hazard (Ex)

• Terminal devices can be connected via FC process cables in accordance

with IEC 61158-2 or SpliTConnect M12 outlet/M12 jack

• Terminating resistance combination can be integrated (SpliTConnect®

terminator)

• Fewer types and parts thanks to standardized connection system for

PROFIBUS PA.

Please refer to Catalog IK PI for further information.

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5.3 PI (Profibus International) Guidelines and other

References

Introduction PROFIBUS is an open fieldbus system which is suitable for various

application areas. The PROFIBUS technology is defined in different standards.

The protocol definitions are summarized in IEC 61158. The communication

profiles (CPF - communication profile families) are defined in IEC 61784-1.

Number 3 (CPF 3) is reserved for PROFIBUS and PROFINET. PROFIBUS

International (PI) promotes the continuous further development and global use

of PROFIBUS.

References The table below gives an overview of the most important documentation on

the topic of PROFIBUS PA.

Title Language Source

PROFIBUS Standard

IEC 61158 Digital data communication for

measurement and control – Fieldbus for use in

industrial control systems

English IEC

IEC 61784-1 Profile sets for continous and discrete

manufacturing relative to fieldbus use in industrial

control systems

English IEC

IEC 61784-1 CPF 3/1

PROFIBUS DP communication profile

English IEC

IEC 61784-1 CPF 3/2

PROFIBUS PA communication profile

English IEC

Implementation Guide IEC 61158/61784,

Type 3 PROFIBUS (PI)

English PI

PROFIBUS guidelines

Specification for PROFIBUS Device Description

and Device Integration,

Volume 1: GSD Specification Order No.: 2.122

English PI

Specification for PROFIBUS Device Description

and Device Integration,

Volume 2: EDDL Specification Order No.: 2.152

English PI

Framework for testing and certification of

PROFIBUS products Order No.: TC1-03-0020

English PI

Test Specifications for PROFIBUS DP-Slaves

Order No.: 2.032

English PI

Test specification for PA-Devices

(Profile 3.0) Order No.: 2.062

English PI

Test specifications for PROFIBUS DP Masters

Order No.: 2.072

English PI

Fiber optical data transfer for PROFIBUS German PI

PROFIBUS RS485-IS User and Installation

Guideline

English PI

Installation Guideline for PROFIBUS DP/FMS Ger./Eng. PI

PROFIBUS PA User and Installation Guide English PI

PROFIBUS profiles

Profile for communication between controllers English PI

Profile for HART English PI

Profile for Process Control Devices

(PA-Branch profile)

English PI

Remote I/O for Process Automation English PI

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Brochures

PROFIBUS system overview

PROFIBUS Technology and Application - System

Description Order No.: 4.002

Ger./Eng. PI

PROFIBUS PA

PROFIBUS for Process Automation

German PI

PROFIBUS – The Multitalent for Communication in

the Process Industry

Ger./Eng. SIE

PROFIBUS Plant-Wide Communication –

The Fieldbus Standard for the Process Industry

Ger./Eng. SIE

Technical literature and training materials

PROFIBUS documentation on CD-ROM Ger./Eng.. PI

Book: The New Rapid Way to PROFIBUS DP Ger./Eng. PI

Web-Based Training PROFIBUS

http://www.profibus.com

Ger./Eng. PI

Software

Device master file (DMF) editor English PI

Table 5-5: References

This literature can be obtained from:

PI PROFIBUS Nutzerorganisation e.V.

Haid - und - Neu Straße 7, 76131 Karlsruhe, Germany

http://www.profibus.com

SIE Brochures, catalogs:

http://www.automation.siemens.com/order_formular/html_00/resoform.asp

Manuals:

http://www2.automation.siemens.com/simatic/portal/html_00/techdoku.htm

IEC https://domino.iec.ch/webstore/webstore.nsf

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Hardware configuring (project example)

This chapter contains:

6.1 Configuring a Station 6–3

6.1.1 Creating a station and starting the hardware configuration 6–4

6.1.2 Configuring the station 6–5

6.1.3 Loading the hardware configuration into a CPU 6–6

6.2 Distributed I/O PROFIBUS DP/PA 6–7

6.2.1 Inserting a DP slave in a station 6–7

6.2.1.1 Device data (Device master file) 6–7

6.2.1.2 Using a SITRANS P via a DP/PA coupler 6–7

6.2.1.3 Using an ET 200iSP with a HART module 6–8

6.3 Station Diagnostics 6–9

6.4 SITRANS P Parameter Assignment with SIMATIC PDM 6–10

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Introduction

• Where field engineering is not directly affected, this chapter does not

cover the configuration and installation of AS and OS. Further details are

described in the references from /100/.

• A knowledge of the systems and devices used is a basic prerequisite for

understanding the following explanations.

• The communications paths within SIMATIC S7/PCS 7 are represented

schematically in Fig. 6-1 to facilitate understanding.

Fig. 6-1 Communications paths for the intelligent field devices within an

automation system

The task

The procedure is explained in more detail on the basis of a specific task to

show how PROFIBUS PA field devices and HART modules are utilized in a

project. The following points are to be implemented in the project:

• Simple level control is to be created.

• The process signal will be acquired by a field device with PROFIBUS PA

connection.

• The disturbance variable will be acquired via an analog input module with

HART function, incorporated in the ET 200iSP I/O system.

• The actuating signal will be emitted via an analog output module without

HART function via the ET 200iSP I/O system.

• Two separate PROFIBUS systems will be used:

− PROFIBUS PA (DP line 1).

− ET 200iSP (DP line 2).

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The level range is 0 to 20 cm. Setpoint inputs, over the range 0 to 20 cm, are to

be made by the plant operator. The controller is only operated in automatic

mode. If the level of 17 cm is exceeded, an alarm message is to be sent to the

OS.

Based on the task, the information flow is shown in Fig. 6-2. Blocks from the

"PCS 7" library are used for process value acquisition, information processing

(closed-loop control, operation, signaling) and output.

You can see its structure from the technological block shown in Fig. 6-2. This

consists of a group of basic blocks whose interconnection and parameter as-

signments result in a particular technological function.

Op. input

block Function

block

Message

block

Technological block

Input

driver

Input

module

HART

Output

driver

Output

module

Input

driver

4..20mA

+HART

Dield device PA Field device conv.

0/4...20 mA

Process

OS Op. input

lock and mes-

sage acquisition in the OS

Fig. 6-2 Principle of the solution with blocks, information path

6.1 Configuring a Station

Note In this description of configuring a station, only those aspects directly relating

to the field engineering package are covered. PCS 7 is used as an example.

More detailed information can be found in the extensive references in the Ap-

pendix.

Fig. 6-3 below is an overview of a possible system configuration in STEP7

HW Config.

Generally, it is possible to configure PA field devices like the SITRANS P via

DP/PA coupler (see Fig. 6-3, DP line 1) or via DP/PA link (see Fig. 6-3, DP

line 3) on the PLC. For the example project described below, configuring is

presented using a DP/PA coupler.

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Fig. 6-3 Example of hardware configuration

6.1.1 Creating a station and starting the hardware configuration

To start configuring and parameter assignment, you need to insert a station

within your project. The method described below shows this with the help of

the "PCS 7" wizard that supports you when creating a project.

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6–5

Perform the following steps to create a station:

• Open the SIMATIC Manager.

• Start the "PCS 7 wizard" with the menu command File > Wizard 'New

Project'.

• The "PCS 7" wizard now leads you through the necessary steps for creat-

ing a project with one station. You can select, for example, the project

type, project name and an appropriate CPU.

• Follow the instructions of the "PCS 7" wizard.

• After terminating the wizard, open the station by double-clicking on

SIMATIC station (right window).

• If you double-click on the "Hardware" icon, a configuration dialog will

open.

6.1.2 Configuring the station

Once you have created the station, assemble the hardware components as de-

scribed in the task description:

• Open catalog "SIMATIC 400" in the hardware catalog

Rack, CPU Rack, power supply and CPU have already been inserted by the PCS 7 wizard,

and must be adapted to the hardware used if required.

DP line 1 The following steps must be taken to parameterize the DP

(CPU) interface integrated in the CPU for DP line 1:

• Enter the address (address 2) with which the integrated DP interface can

be addressed on the bus.

• Enter a new subnet for the DP line (NEW button) and change the name to

"DP line 1".

• Enter the parameters for "Network settings" according to your system (e.g.

for "DP line 1" the highest PROFIBUS number: 126; data transfer rate:

45.45 kbit/s using a DP/PA coupler; profile: DP) and exist the menus for

the DP network with "OK". "DP master system (1)" will be displayed.

• If entries are made under menu item "Lines", the bus parameters will be

computed automatically.

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DP line 2 You can insert another DP line in the station with the CP 443-5

(CP 443-5 Extented) Extended communications processor.

• Select the next free slot (slot 4) in your rack as the current slot by clicking

once (shown in blue).

• Open Catalog "CP-400" in the hardware catalog and insert a CP 443-5 Ex-

tended in the rack. You are then automatically in the dialog box for con-

figuring the DP network.

• Enter the address (address 2) with which the integrated CP 443-5 Ex-

tended can be addressed on PROFIBUS DP.

• Enter a new subnet for the DP line (NEW button) and change the name to

"DP line 2".

• Double click the CP 443-5 Extended and open the "Mode" tab.

• Set the "DP master" and "Delay (ms)" to 0.

• Enter the parameters for "Network settings" according to your system (e.g.

for "DP line 2" the highest PROFIBUS number: 31; data transfer rate: 1.5

kbit/s using a PROFIBUS DP/PA (according to network requirements);

profile: DP) and complete the dialogs for network configuring with "OK".

"DP master system (2)" will be displayed.

System network You need the CP 443-1 communications processor

(Ethernet) for communication between AS, ES or OS systems via Industrial Ethernet.

• Select the next free slot in your rack (slot 5) as the current slot by clicking

once (shown in blue).

• Open "CP-400" in the hardware catalog and insert a CP 443-5 Basic in the

rack. You are then automatically in the dialog box for configuring the

Ethernet network.

• Enter the IP with which the CP 443-1 can be addressed on the bus (e.g. IP

address 192.168.0.1).

• Enter a new subnet for the Ethernet line ("NEW" button), change the name

to "Ethernet(1)" and close the dialog box for network configuring with

"OK".

6.1.3 Loading the hardware configuration into a CPU

Configuring of the SIMATIC station is complete and you can pass on the in-

formation to the CPU with "Target system > Load into module". To load the

module data, the CPU must be in the "STOP" state. A dialog is displayed in

which you can select the target module for loading the hardware configuration.

In the example, there is a choice of the "CPU 416-2 DP" and "CP 443-1".

Leave both modules selected because you must load both modules. The "CP

443-5 Extended" is not offered for loading because this module is loaded as

the DP master via the CPU.

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Note:

• The first load operation of a CPU can only take place via the MPI of

the CPU. The CP 443-5 for PROFIBUS is supplied with the commu-

nications parameters. Each subsequent load operation can then take

place via PROFIBUS or Ethernet. Ensure that the correct module is

assigned in the PG/PC interface.

• You can get more information on hardware configuring in the manual

/100/.

6.2 Distributed I/O PROFIBUS DP/PA

Note

Only aspects relating to PROFIBUS DP/PA are dealt with here. When a

DP/PA coupler is used in the DP network, the connected PROFIBUS PA field

devices act as compact DP slaves. If the DP/PA couplers are grouped in a link

module, the link module acts as a modular slave.

The following distinctions are made when configuring the DP slaves:

• Compact DP slaves are directly connected, individual devices

(for example, SITRANS P via a DP/PA coupler).

• Modular DP slaves (for example, link modules with up to five PROFIBUS

PA lines).

• Intelligent slaves (I slaves) (DR 21 compact controllers).

6.2.1 Inserting a DP slave in a station

6.2.1.1 Device data (Device master file)

Configuring of PROFIBUS PA field devices via the DMF is only necessary

with non-Siemens field devices. Siemens field devices can be configured using

the hardware catalog in STEP7 HW Config.

Non-Siemens field devices can be inserted into the hardware configuration

with the help of the GSD files supplied. They are then available in the hard-

ware catalog.

Note:

You can get more information on hardware configuring in the manual

/100/.

6.2.1.2 Using a SITRANS P via a DP/PA coupler

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The steps for inserting a slave in a DP/PA line are shown using the example of

a SITRANS P. In this case, PROFIBUS PA is linked via a DP/PA coupler to

PROFIBUS DP.

Note:

Please ensure that the hardware requirements for the PROFIBUS PA are met

and that the data transfer rate is set to 45.45 kbit/s.

• Open the Hardware Catalog and select the "Standard" profile.

• Open the folder "PROFIBUS PA / Sensors / Siemens /" and drag the com-

ponent "SITRANS P" to the DP line "DP master system (1)" while hold-

ing the left mouse key down.

• You will see a menu for making entries for "PROFIBUS Station

SITRANS". Enter the slave address and name there. However, changes to

the bus characteristics affect all the slaves located on the line and also

change the bus characteristics already set for the master.

• Select the object "SITRANS P" and mark the entry for the first slot in the

lower list field. Assign a symbolic name with the right mouse key and the

command "Edit Symbols...". For the process value (data type "Real"), en-

ter the symbolic name "Print1", for example, and for the relevant quality

code (data type "Byte"), enter the name "QC_Print1" and confirm with

"OK".

• Save the current configuration.

6.2.1.3 Using an ET 200iSP with a HART module

ET200iSP The steps for inserting a modular slave into a DP line are shown using the

example of an ET 200iSP with a HART module. DP line 2 was configured as

described in Section 6.1.2.:

• Open the catalog "PROFIBUS DP" from the hardware catalog.

• Open "ET 200iSP" and drag the "IM153-2" to the DP line "DP master sys-

tem(2)" while holding the left mouse key down (drag&drop).

• A menu for "PROFIBUS station characteristics" will appear in which you

will enter the address of the ET 200iSP. The subnet will be automatically

set by allocating the IM 153-2 to a line. Additionally, you can change the

characteristics of the DP line (highest number of stations, data transfer

rate, profile). However, changes to the bus characteristics affect all the

slaves on the line and also change the bus characteristics already set for

the master. Exit the menu with "OK" after setting the bus number.

• Select the first slot in the ET 200iSP (slot 4) as the current slot (blue sur-

rounding) and open the hardware catalog of the IM 153-1, which you have

dragged to the line.

• Open a module type "AI" (analog inputs) and select module 4AI2WIRE

HART by double clicking. This module will automatically be assigned to

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the current slot in the ET 200iSP, and the next free slot will become the

current slot.

• Open the module type "AO" (analog output modules) and select module 4

AO Hart by double-clicking. This module will automatically be assigned

to the current slot in the ET 200iSP, and the next free slot will become the

current slot.

• After assigning the modules to the slots, you can double click a module in

the ET 200iSP to set the characteristics of the module (current or voltage,

live or dead zero, etc.). For assigning parameters to the individual mod-

ules, please consult the module descriptions.

Note:

A HART module can be parameterized for use with HART function or without

HART function via the module properties.

• Now assign a symbolic name for the relevant process value for the module

"4 AI 2WIRE HART" and "4 AO Hart" for each channel used as de-

scribed in Section 6.2.1.2.

HART module After inserting the two HART modules, four additional lines per HART mod-

ule are created in the detailed view of the ET 200iSP. These additional lines

can be assigned HART field devices.

• Open the hardware catalog of the IM152-1 that you have dragged to the

line.

• Open the module "4 AI 2WIRE HART" and insert the module HART

field device into the first slot (channel) of the 4 AI 2WIRE HART by

dragging and dropping or by double-clicking.

• Save the current configuration and load it onto your CPU.

SIMATIC PDM You start the parameterization software tool SIMATIC PDM by

double-clicking on the HART field device (channel 1) of the 4 AI 2Wire

HART shown. The window "Insert SIMATIC PDM Object", where you can

specify a unique device name for the HART field device, will open first. Exit

the window with OK.

The device selection window will then open. All the HART-protocol-enabled

field devices available in SIMATIC PDM will appear in the device selection

window.

The remaining procedure is the same as that described in Section 6.4 as an ex-

ample for a PROFIBUS PA device.

6.3 Station Diagnostics

You have the facility for reading out the current status of modules for a con-

figured station. A prerequisite is that there is a connection between automation

system and PC/PG.

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• In the SIMATIC Manager, select the menu command "View > Online".

You will see an online view of you station.

• Open the AS from which you wish to read the diagnostic data (click on the

"+" in front of the AS).

• Open the CPU.

• Select the program in the CPU with a click.

• Execute menu command "Target system > Module Status".

• Select the "Diagnostic buffer" tab in the menu shown.

In the "Events" window, you will see messages of events in brief form. If you

click on an event in this window, a detailed description of the event will appear

in the lower window. By clicking on "Event help" you can obtain further in-

structions for assessing events or clearing an existing fault.

6.4 SITRANS P Parameter Assignment with SIMATIC PDM

Note Section 6.1.1.2 describes how you incorporate a field device with PA profile

in the hardware configuration. This section shows how you can assign parame-

ters to this field device with the parameter assignment tool SIMATIC PDM.

However, only a few aspects are mentioned here. The online help is expressly

referred to. The parameter assignment interface represented by SIMATIC

PDM largely results from the DD description supplied with the field devices.

A description of individual parameters and parameter assignment operations

can be found in the device manuals. The online help is available for further

support.

Start You start SIMATIC PDM by double clicking on the field device symbol

in the hardware configuration.

Device selection In the device selection window, you will find all the field devices available

in SIMATIC PDM which may pertain to a device database (DMF).

• Double click on the SITRANS P symbol on the DP line to open the "Insert

SIMATIC PDM Object" window.

• Exit the window with OK, after making any required changes.

• The "Device Selection" window opens.

• Open catalog "PROFIBUS PA".

• Open the catalogs "Sensors" – "Pressure" – "Siemens" in succession.

• Select the device type (SITRANS P).

• Select the type of measurement (absolute pressure).

• Select the measuring range (250 mbar).

Access authorization The access authorization (password) for the parameter groups in SIMATIC

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PDM is defined in the "user" window. A distinction is made between two

access authorizations:

• The specialist has access to all writable parameters.

• The maintenance engineer has only restricted read/write access to the pa-

rameters.

Start dialog The display that now opens consists of three parts:

• Menu bar for data management/data transfer

• Parameter tree for fast access to individual parameter groups.

• Parameter list

The contents of the parameter tree and parameter list are governed by the EDD

description (see Fig. 6-4).

Parameter lists You can change all parameter fields with a white background in parameter

lists. Changed parameters and the corresponding parameter tree branch are

marked. The marking is only removed:

• when archiving in the database;

• when transferring the parameters to the field device.

Data management The data record of each field device can be

• edited offline;

• archived in a database;

• read out of the field device;

• transferred to the field device

• or printed.

Online functions The following online functions can be used with SIMATIC PDM:

• Measured value indication with status

• Alarm status

• Device status

• Address change

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Fig. 6-4 SIMATIC PDM

04.2005 7 Software Configuring (Project Example)

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7–1

Software Configuring (Project Example)

This chapter contains:

7.1 Project Example: Control Loop (CFC) 7–2

04.2005 7 Software Configuring (Project Example)

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7–2

The task On the basis of the task described in Chapter 6, the first example in this

chapter describes the implementation of the control loop as a continuous

control loop using the CFC configuring tool. In the second example, the con-

trol loop is described as a two-step control loop using the SFC configuring

tool.

7.1 Project Example: Control Loop (CFC)

CFC The continuous function chart (CFC) is a graphics editor. It serves to create

an overall software structure for a CPU from prepared blocks (blocks written

by the user or adopted from libraries). The blocks are positioned on function

charts, assigned parameters, and interconnected. This results in an automation

structure that is loaded into the AS after generation of the executable machine

code.

Note:

A detailed description of the CFC can be found in the manual /254/.

Basic mode You work with graphics in the CFC editor: you select prepared blocks from

of operation the available set of blocks, position them with drag&drop on the chart, a kind

of "drawing sheet" and interconnect them with each other using the mouse.

You need not be concerned with such details as algorithms or the allocation of

machine resources, but can focus on the technological aspects of configuring.

The run characteristics of the blocks are defaults but can be adapted separately

for each block. A considerable aid to working is that you can copy or shift in-

dividual blocks or entire groups of blocks from chart to chart. The block inter-

connections are retained.

When you have created all the functions, you generate the executable machine

code by clicking the mouse, load it into the PLC, and test it with the CFC test

functions provided for the purpose.

Selecting the Implementation of the solution principle shown in Fig. 6-2 is executed in

blocks steps. The AS hardware was configured with STEP 7 resources in Chapter 6,

that is, it is already known which analog input/output modules will be used, in

which rack, at which slot they are installed, and to which module channel the

relevant level sensor (PROFIBUS PA), flow sensor (HART) or actuator

(control valve) is connected. The software can be structured under CFC on this

assumption.

By using the blocks from the "PCS 7 Library" library, it is possible to solve the

task by simple means. Only the interconnections, parameter assignments and

allocation of symbolic names for the configured channels are required.

In this example, we use the extensive block libraries made available to you by

PCS 7.

Drivers

• Block IN_A1 (4 AI2xHART analog input module) is selected from the

"Driver blocks" section of the "PCS 7" library for reading in the tempera-

ture.

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7–3

• The PA_AI block (SITRANS P pressure transducer) is selected from the

"Driver blocks" section of the "PCS7" library for reading in the level.

• The OUT_A1 block (4AO HART analog output module) is selected from

the "Driver blocks" section of the "PCS 7" library to output the manipu-

lated variable of the controller.

Function blocks

The tasks of operating, controlling and signaling can be handled with a single

block, the CTRL_PID block It has all the necessary characteristics for the task

presented:

• PID controller

• Operable with limits

• Signaling capability

This block can be found in the "Control" folder of the "PCS 7" library.

Structuring the Described in the following is the procedure using the CFC for the task

blocks (as the standard tool for configuring process-engineering plants). For

details of CFC handling or project management, please consult the CFC

manual.

• Create a chart with a designation corresponding to the task (e.g.

LICA_123) in the chart container of your project.

• Open the chart.

• Position one instance of each of the previously selected block types (in the

example, one each for CH_A1, PA_AI, CH_AO, CTRL_PID) on your

chart by transferring it from the block library.

• Name the blocks as required.

• For editing, register all instances in a common time-interrupt OB (e.g.

OB32) (CFC keyword "Run characteristics"). In the sequence for block

calls from the OB, the general rule "Read in–>Edit–>Output" must be fol-

lowed. To specify the sequence, you must establish where each block ob-

tains its parameters. As a rule, it must be reported to all other blocks from

which it obtains interconnected values. In this example: CH_AI, PA_AI,

CTRL_PID, CH_AO.

• Interconnect the outputs of the blocks supplying values to the correspond-

ing inputs of the blocks that process these values.

• With each instance, assign parameters to the inputs with the relevant proc-

ess values via the symbolic names and their default values.

• Interconnect the outputs with the inputs in accordance with the diagram in

Fig. 6-2.

• A dialog is opened using the command "Compile". By selecting the option

"Generate Driver Blocks" and confirming with "OK", the CFC chart is

compiled and all the necessary driver blocks are generated.

• Now load the program into the CPU.

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7–4

• Test the structure with the online test resources.

• Configure the OS variable block of the CTRL_PID (see its description in

the section entitled "Operator control and process monitoring via OS"

/254/).

04.2005 Reference literature

SIMATIC Feldautomatisierung

Reference literature

/100/ Manual: S7-400 and M7-400 Programmable Controllers

Installation and Hardware

/101/ Reference Manual: S7-400 and M7-400 Programmable Controllers

Module Specifications

/102/ Instruction list: S7-400 Programmable Controller,

CPU 414/416

/140/ ET 200M Distributed I/O Device

Manual

/141/ ET 200L Distributed I/O Device

Manual

/231/ User Manual: Standard Software for S7 and M7,

STEP 7

/232/ Manual: Statement List (STL) for S7-300/400,

Programming

/233/ Manual: Ladder Logic (LAD) for S7-300/400,

Programming

/234/ Programming Manual: System Software for S7-300/400,

Program Design

/235/ Reference manual: System Software for S7-300/400

System and Standard Functions

/236/ Manual: Function Block Diagram (FBD) for S7-300/400

Programming

/237/ STEP 7 Overall Index

/250/ Manual: Structured Control Language (SCL) for S7-300/400,

Programming

/251/ Manual: GRAPH for S7-300/400,

Sequential Function Charts

/252/ Manual: HiGraph for S7-300/400,

Programming State Diagrams

/253/ Manual: C Programming for S7-300/400,

Writing C Programs

/254/ Manual: Continuous Functions Charts,

Basic Section and System-Specific Section: Graphical Interconnec-

tion of S7 / M7 Technological Functions

/255/ Manual: Process Control System PCS 7,

Sequential Function Charts

/256/ Manual: Process Control System PCS 7,

Technological and Cross-Phase Structuring of ES Systems

04.2005 Reference literature

SIMATIC Feldautomatisierung

/257/ Manual: Process Control System PCS 7,

Automating Batch Processes with the BATCH flexible System

/258/ Reference manual: Process Control System PCS 7,

Library of Basic Blocks

/259/ Reference manual: Process Control System PCS 7,

Library of Technological Blocks

/260/ Reference manual: Process Control System PCS 7,

Library of Field Device Blocks

/261/ System overview: Process Control System PCS 7

/280/ Programming manual: System Software for M7-300/400,

Program Design

/281/ Reference manual: System Software for M7-300/400,

System and Standard Functions

282/ User manual: System Software for M7-300/400,

Installation and Operation

/290/ User manual: ProC/C++ for M7-300/400,

Writing C Programs

/291/ User manual: ProC/C++ for M7-300/400,

Debugging C Programs

/300/ Technical Overview: SIMATIC WinCC,

Windows Control Center

/301/ Manual: SIMATIC WinCC,

Control Center + Global Script + User Administrator

/302/ Manual: SIMATIC WinCC,

Graphics Designer

/303/ Manual: SIMATIC WinCC,

Tag Logging + Alarm Logging + Report Designer

/304/ Manual: SIMATIC WinCC Options,

Basic Process Control + Advanced Process Control + ChipCard + Video

/502/ Manual: SIMATIC,

DP/PA Bus Coupling

/503/ Programmable Controller: SIMATIC S7-300, M7-300, ET200M

Ex I/O Modules, Reference Manual

/504/ Getting Started: SIMATIC Process Control System PCS 7,

Guide

/519/ Programmable Controller: SIMATIC S7-300, M7-300, ET200M

Ex I/O Modules, Fundamentals of Explosion Protection

/601/ ET 200iSP Distributed I/O Device

Manual

/603/ S7-300 Programmable Controller, Installation and Hardware

Manual

/604/ SIMATIC NET PROFIBUS Networks

Manual

/605/ SIMATIC DP/PA Link and Y Link Bus Couplings

04.2005 Index

SIMATIC Feldautomatisierung

Index

Addressing 3–10

Bending radius 5–6

Bus cycle time 3–9

Bus system 5–2

Cable capacitance 5–7

Cable laying 5–5

Cable specification 5–7, 5–9

Cable type 5–7

Cables 5–5

CFC 7–2

COM PROFIBUS 2–9

communications paths 6–2

Configuring 2–9, 6–3

Connection system 5–2

Connectors 5–12

coupler 3–2, 3–9

Coupler 2–2, 3–10

Data transmission 5–4

Device data 6–7

Device master file 3–16

Device profiles 3–12

DMF 3–16

driver function blocks 3–17

EDD 3–17

Equipotential bonding 5–5, 5–11

field device blocks 3–17

Field device blocks 2–9

Grounding 5–11

Hardware 3–2

Hardware configuring 2–9

Hardwarekomponenten 2–2

HART 1—5, 1—14, 2–3, 3–12

HART modules 3–4

Hub technology 5–4

Impedance 5–7

Installation 5–4

Installation guidelines 5–1

Installation materials and tools 5–13

Installation site 5–4

Installing 5–5

Interface module IM 157 3–3

interoperability 3–14

Interoperability 3–13

Koppler 1—8

Lightning protection 5–11

link 3–3, 3–10, 3–11

Link 1—9, 2–3, 3–5

Machine code 7–2

MMC 2–5, 2–6

PA profile 3–12

parameterization 2–9

PDM 2–10

potential savings 1—10

Power requirements 5–3

PROFIBUS 1—4

PROFIBUS DP 1—4, 1—6

PROFIBUS PA 1—5, 1—8

quantity framework 3–9

Shield 5–5

Shielding 5–7

Shielding concept 5–9

Signal attenuation 5–7

SIPROM 6–10

Station diagnostics 6–9

System network 6–6

04.2005 Glossary

SIMATIC Feldautomatisierung

Glossary

Address An address is the identification for a particular operand or operand range.

Examples: input I 12.1, flag word FW 25, data block DB 3.

Analog module Analog modules convert analog process values, such as temperature, to

digital values which can be further processed by the CPU, or convert digital

values to analog manipulated variables.

Arrangement, There is a centralized arrangement when the process I/Os and CPU are

centralized accommodated in the same rack or in expansion units in the same or adjacent

cabinet.

Arrangement, There is a distributed arrangement when the process I/Os are not arranged

distributed with the CPU in the same rack or in the same or adjacent cabinet, but

are separated and interconnected by a communications bus (e.g. field bus).

Automation system An automation system is a → programmable controller with control system

functionality, comprising at least one → CPU, various input and output

modules as well as HMI devices.

Backplane bus The backplane bus is a serial data bus via which the modules communicate

with each other and via which they are supplied with the required power. The

connection between the modules is provided by bus connectors.

Baud rate The baud rate is the speed of data transmission; it indicates the number of

bits transmitted per second (baud rate → bit rate).

Baud rates of 9.6 kbaud to 12 Mbaud are possible with the ET 200.

Blocks Blocks are parts of a user program, demarcated by their function, structure

or purpose.

Bus segment → Segment

Central section The central section of an AS comprises the following components: CPU,

rack, power supply, main memory and load memory. The basis is the

SIMATIC S7–400 automation system.

CFC A continuous function chart makes function charts in which blocks can be

interconnected and assigned parameters.

Chart A chart is the highest hierarchical level of a hierarchical block entity system.

It has an implicit type but no interface and therefore cannot be connected.

Charts cannot contain charts.

Cold restart During the startup of the AS CPU (e.g. when the mode switch is changed from

STOP to RUN or upon POWER ON), either organization block OB 101 (warm

restart only with the S7-400) or organization block OB 100 (cold restart) is

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first processed before the cyclic program processing (OB 1). With a cold re-

start, the process image of the inputs is read in and the S7 user program is

processed, starting with the first command in OB 1.

Configuration The assignment of modules to racks/slots and addresses. A distinction is made

between the actual configuration (modules plugged in) and the specified con-

figuration. You preset the latter with STEP 7, COM PROFIBUS (or COM ET

200 Windows). The operating system can thus detect modules inserted incor-

rectly during the → start.

CPU Central processing unit of the S7 automation system with its control and

arithmetic unit, memory, operating system and interface for programming de-

vice.

Device description This is a universal, standardized device and parameter description for

(DD) PROFIBUS-PA and HART protocol-capable field devices.

Distributed I/O The distributed I/O are devices situated at a distance from the central

section and serve for input/output (e.g. field devices or analog and digital

modules).

DP address Each station must be given a DP address for unique identification on the

PROFIBUS-DP. The PC/PG or ET 200 handheld have the DP address "0". The

DP master and DP slaves have a DP address in the range 1 to 125.

DP master A → master which behaves according to standard EN 50170, Volume 2,

PROFIBUS, is known as a DP master.

DP slave A → slave which is operated on PROFIBUS with the PROFIBUS-DP

protocol and which behaves according to standard EN 50170, Volume 2,

PROFIBUS, is known as a DP slave.

DP standard DP standard is the bus protocol according to standard EN 50170, Volume 2,

PROFIBUS.

Engineering system A PC-based configuring system with which the process control system can

be configured or adapted to the required tasks, in a convenient and visual man-

ner.

ES → Engineering system

ET 200 The ET 200 distributed I/O system with the PROFIBUS-DP protocol is a bus

for connecting distributed I/Os to a CPU or adequate DP master. ET 200 is

characterized by fast reaction times because only a few data (bytes) are trans-

ferred. ET 200 is based on standard EN 50170, Volume 2, PROFIBUS. ET 200

operates according to the master-slave principle. DP masters can be, for exam-

ple, the IM 308-C master interface or the CPU 315-2 DP. DP slaves can be the

distributed I/Os ET 200B, ET 200C, ET 200M, ET 200U or DP slaves from

SIEMENS or other manufacturers.

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Field devices Intelligent field devices can be connected via their field bus interface over

PROFIBUS-DP or PROFIBUS-PA, and thus linked to the control system.

Substitute blocks are available for the SIEMENS field devices.

FO The abbreviation for fiber optic (cable) the transmission medium for

PROFIBUS.

Function block According to IEC 1131-3 , a function block (FB) is code block with static

data which has a "memory". A function block offers the facility for transfer-

ring parameters in the user program. Function blocks are thus suitable for pro-

gramming frequently recurring complex functions such as closed-loop controls

and mode selection.

I/O bus Part of the S7 300 → backplane bus in the automation system, optimized

for the fast exchange of signals between the IM 153 and the signal modules.

Useful data (e.g. digital input signals of a signal module) and system data (e.g.

_default parameter data records of a signal module) are transferred via the I/O

bus.

IP 20 Degree of protection to DIN 40050: Protection against touching with the

fingers and against the ingress of solid foreign bodies with a diameter of more

than 12 mm.

Master When a master is in possession of the token, it can send data to other

stations and request data from other stations: → DP masters are, for example,

the CPU 416-2 DP or IM 308-C.

Master-slave A bus access process with which only one station is the → DP master and

procedure all other stations are the → DP slaves.

Message class The message class governs the nature of the message. With SIMATIC PCS 7

the message classes are alarm, warning, tolerance, AS and OS control system

message, process message, operator input request and operator input message.

Message type There is a further subdivision for each message type (e.g. alarm, warning,

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tolerance). Together with the message class, this governs the type of message.

Examples of messages types are alarm_high, alarm_low, warning_high, warn-

ing_low.

Messages, The creating of messages with their texts and attributes. Messages are

configuring of configured from the CFC/SFC.

Module Module parameters are values with which the behavior of the module can be

parameters set. A distinction is made between static and dynamic module parameters.

MPI The multipoint interface is the programming device interface of SIMATIC

S7. It forms the entry level of a system bus with SIMATIC PCS 7.

Network A network comprises one or more linked subnetworks with any number of

stations. Two or more networks may exist side by side.

ODBC The abbreviation for open database connectivity. This is a Microsoft

technology enabling database access.

OLE The abbreviation for object linking and embedding. This is a Microsoft

technology enabling the linking of and data interchange between programs.

OLM The abbreviation for optical link module. This is an element for connecting

the redundant FO cable of PROFIBUS to the components of PCS 7.

OM The abbreviation for object manager. OMs manage objects persistently

stored there. Applications operate with these objects and execute operations on

them exclusively by invoking object methods.

Organization Organization blocks (OB) form the interface between the operating system

block of the AS CPU and the user program. The sequence for processing the user

program is specified in the organization blocks.

OS Operator control and process monitoring system.

Parameter A parameter is: 1. a variable of an S7 code block (current parameter,

formal parameter); 2. a variable for setting the behavior of a module. Each pa-

rameterizable module has, when supplied, a meaningful basic setting which

can be changed by STEP 7.

PCS Process control system.

PLC Programmable (logic) controller

PMC Process monitoring and control. Communications mechanisms with

SIMATIC S5 and S7.

Process variable The process variable is a resource-neutral (project-global) object. It serves

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for linking the AS configuring world (STEP 7, CFC...) to the OS configuring

world (WinCC). It possesses information about the location at which the proc-

ess variable exists at runtime (e.g. network address in the AS) and information

on specific OS-relevant characteristics.

PROFIBUS PROcess FIeld BUS, the European process and field bus standard defined in

the PROFIBUS standard (EN 50170). It specifies the functional, electrical and

mechanical characteristics for a bit-serial field bus. PROFIBUS is a bus system

for networking PROFIBUS-compatible automation systems and field devices

at the cell and field levels. PROFIBUS is available with the protocols DP (→

distributed I/O), FMS (→ fieldbus message specification) or TF (→ techno-

logical functions).

PROFIBUS-DP The PROFIBUS bus system with the DP protocol. DP stands for distributed

I/O (periphery). The ET 200 distributed I/O system is based on standard

EN 50 170, Volume 2, PROFIBUS.

Programmable (logic) A controller whose function is stored in the control unit in the form of a pro-

gram. Thus the configuration and wiring of the unit do not depend on the function of the control-

ler. The PLC has the structure of a computer; it consists of a CPU with memory, input/output mod-

ules and internal bus system. The I/Os and programming language are oriented to the requirements of

the control system.

Project A project is a container for all objects of an automation solution, irrespective

of the number of stations, modules and their networking.

Release All products with an order number have a release; it indicates the version of

the product. The release is incremented with upward-compatible function ex-

tensions, for production-related modifications (the use of new parts / compo-

nents) and for error corrections.

Segment The bus cable between two terminating resistors forms a segment. A segment

contains 0 to 32 → stations. Segments can be linked via RS 485 repeaters.

SFB Standard function block, a preprogrammed function block with a defined

application-specific function.

SFC A sequential function chart serves for creating sequence controllers for

SIMATIC S7. These can be visualized with the SFC visualization package on

the OS.

SIMATIC PCS 7 This is the name of the new control system based on SIMATIC S7.

Slave A slave may only exchange data with the master upon request by the master.

Examples of slaves are all DP slaves such as the ET 200B, ET 200C, ET

200M, etc..

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SPC/SQC The abbreviation for statistical process control/statistical quality control.

Methods for quality control by acquiring and evaluating statistical values.

Standard function These are blocks for the CFC which are provided by the SIMATIC PCS 7

blocks libraries.

Start events Start events are defined events such as faults or alarms and initiate

the operating system to start a corresponding organization block.

Startup This is run through during the transition from the STOP state to the

RUN operating state. It can be initiated by a POWER ON or by the ES.

Station A unit which can send, receive or amplify data via the bus, e.g. DP master,

DP slave, RS 485 repeater, active star coupler.

STEP 7 A programming language for creating user programs for SIMATIC S7

controllers.

Symbol A symbol is a name defined by the user, taking syntax specifications into

account. This name can be used for programming and for operator control and

process monitoring according to the definition for which it stands (e.g. vari-

able, data type, jump label, block).

Example:

Operand: I 5.0, data type: BOOL, symbol: emergency-off button

Symbol table A table for assigning symbols (→ name) to addresses for global data and

blocks. Example: Emergency-off (symbol), I 1.7 (address), controller (sym-

bol), SFB 24 (block).

System bus This is the bus to which all components such as the AS, OS and ES are

connected and with which they exchange data with one other.

Terminating A terminating resistor is a resistor for matching the line at the bus cable;

resistor terminating resistors are required at the cable and segment ends. With

ET 200, the terminating resistors are switched on/off in the → bus con-

nector.

Type A type represents a pattern for any number of entities and describes how

these entities are structured internally. All entities of a type follow the same

basic definition with respect to behavior and information structure (data struc-

ture), but contain individual data.

User function A block type created by the user for utilization by the CFC. Block types are

block created, for example, by SCL → Type.

User program The user program contains the structure for the automation programs, as

well as the data for the signal processing with which a plant or process can be

controlled.

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