0909-55 - Blue Chip Technology - Datasheet.Directory

RB-8

Eight Channel

Relay Output Card

User Manual

RB-8

User Manual

Document Part N°0127-0197

Document Reference RB-8\..\0127-0197.Doc

Document Issue Level 2.2

Manual covers PCBs identified RB-8 Rev. B

transmitted, in any form or by any means, electronic, mechanical, photocopied, recorded or otherwise,

without the prior permission, in writing, from the publisher. For permission in the UK contact Blue Chip

Technology.

Information offered in this manual is correct at the time of printing. Blue Chip Technology accepts no

responsibility for any inaccuracies. This information is subject to change without notice.

All trademarks and registered names acknowledged.

Blue Chip Technology Ltd.

Chowley Oak, Tattenhall

Chester, Cheshire

CH3 9EX.

Telephone : 01829 772000 Facsimile : 01829 772001.

Amendment History

Issue

Level Issue

Date Author Amendment Details

2.0 12/4/95 SH Major re-write

2.1 28/2/96 EGW Addition of EMC information to Technical

Specification, new front sheet. Errors

corrected. Doc ref was RB81040. Filename

was ...\RB-8.doc. Part number added

2.2 09/12/97 SEJ Window front cover and logo. See ECN

97/144.

Contents

Blue Chip Technology Ltd. 01270197.doc

1.0 INTRODUCTION..........................................................................1

2.0 INSTALLATION............................................................................2

2.1 Setting the Base Address.........................................................2

2.2 Setting the Relay Power on State.............................................2

3.0 OPERATION................................................................................3

3.1 Selecting a Relay By Software .................................................3

3.2 Reading the Contact Status......................................................3

4.0 USER CONNECTIONS................................................................5

5.0 SPECIFICATION..........................................................................6

5.1 Technical .................................................................................6

5.2 ELECTROMAGNETIC COMPATIBILITY (EMC)...........................8

EMC Specification .........................................................................9

APPENDICES..................................................................................10

Appendix A - NUMBERING SYSTEMS........................................10

Binary and Hexadecimal Numbers...............................................10

Base Address Selection ...............................................................13

APPENDIX B - PC MAPS.................................................................14

PC/XT/AT I/O Address Map .........................................................14

PC/XT Interrupt Map....................................................................15

PC/AT Interrupt Map....................................................................16

DMA Channels.............................................................................16

Introduction Page 1

Blue Chip Technology Ltd. 01270197.doc Page 1

1.0 INTRODUCTION

The Blue Chip Technology RB-8 board provides the user with eight volt-free

contacts for use in general control applications. The relay contacts will handle

voltages up to mains potential at low currents or small voltages with a current

handling up to 2 Amps.

The board has the facility to power up with various combinations of normally

open and normally closed contacts at the output connector. This selection is

made by user selectable links. The operating program can read back the status

of the relay contacts thereby checking that the relay contact has actually

operated as instructed.

The card occupies only one I/O location which is both a read and write address.

A write to this location sets the desired relay(s) while a read from this address

returns the contact status.

Connection to the card is by screw terminals which facilitates easy connection to

the user.

Page 2Installation

Page 201270197.doc Blue Chip Technology Ltd.

2.0 INSTALLATION

2.1 Setting the Base Address

The base address selection for the card is made by links on the header

block JP9. There are ten address line selections on the block ranging from

200 HEX to 001 HEX. Address 200 HEX is at the left hand side of the jumper

block.

An address line is selected if there is NO link present on the pins. To select an

address of 300 HEX for example, all links except 200 H and 100 H should be

fitted. The RB-8 card is set to 300 HEX prior to leaving the factory.

200

100

JP9

Diagram Showing Address Selector Header

Example shows address 300 Hex

2.2 Setting the Relay Power on State

The RB-8 can be set as to which contacts will power up in the normally open or

normally closed state, on an individual contact basis.

This selection is made by the ‘handbag’ type links on the card. Each link

consists of three positions, the middle one of each being the common pin. The

pins to either side of the common pin are marked ‘NO’ and ‘NC’ (normally

open and normally closed). To set a particular contact pair to, say normally

open, place a link between the common centre pin and the pin marked ‘NO’.

Each set of relay contacts should be set to the required state prior to installing

the card into the host computer.

Operation Page 3

Blue Chip Technology Ltd. 01270197.doc Page 3

3.0 OPERATION

3.1 Selecting a Relay By Software

Switching the relays by software is a matter of writing the correct bit pattern to

the base address. The following BASIC example demonstrates this, assuming

that the base address is set to 300 HEX.

10 INPUT"SELECT RELAY TO SWITCH > ", RS

20 IF RS=0 THEN VALUE=0:rem all relays off

30 IF RS=1 THEN VALUE=1:rem bit 0

40 IF RS=2 THEN VALUE=2:rem bit 1

50 IF RS=3 THEN VALUE=4:rem bit 2

60 IF RS=4 THEN VALUE=8:rem bit 3

70 IF RS=5 THEN VALUE=16:rem bit 4

80 IF RS=6 THEN VALUE=32:rem bit 5

90 IF RS=7 THEN VALUE=64:rem bit 6

100 IF RS=8 THEN VALUE=128:rem bit 7

110 OUT (&H300), VALUE:rem send value to switch relay on

150 GOTO 10

This simple program allows single relays to be switch on and serves to illustrate

the relationship between a single relay and its corresponding bit in the value

sent to the card.

Since each relay is controlled by an individual bit within the data sent to the

card, any one or any number of relays can be switched on or off simply by

writing the correct bit pattern to the board's base address.

3.2 Reading the Contact Status

The RB-8 card permits the user to read back in software the status of each relay

contact. This is not a signal generated from a logic holding register, but a logic

level produced by a second contact set. This allows a software program to test

the physical status of the contacts to test for relay failure.

Page 4Operation

Page 401270197.doc Blue Chip Technology Ltd.

The relay status is determined by a software read to the board address. The

following example illustrates this:

120 RSTAT = INP (&H300):rem read relay address

130 RNUM = 255 - RSTAT:determine relay number (active LOW)

140 PRINT"RELAY CURRENTLY OPERATED = ";RNUM;

These two programs may be combined to demonstrate a relay "Set" and

confirmatory "Read" operation.

Connections Page 5

Blue Chip Technology Ltd. 01270197.doc Page 5

4.0 USER CONNECTIONS

The user connections to the card are made by pins on the connector (or optional

screw terminals) at the rear of the board. These terminals may carry voltages

up to mains potential, therefore care must be exercised. Using voltages as high

as this on the rear of a PC card is not generally to be recommended.

Pin Contact

1RLA 8a

2RLA 8b

3RLA 7a

4RLA 7b

5RLA 6a

6RLA 6b

7RLA 5a

8RLA 5b

9RLA 4a

10 RLA 4b

11 RLA 3a

12 RLA 3b

13 RLA 2a

14 RLA 2b

15 RLA 1a

16 RLA 1b

Connection Pinouts

Note: Pin 1 is left hand most connection nearest to the edge connector.

Page 6Specification

Page 601270197.doc Blue Chip Technology Ltd.

5.0 SPECIFICATION

Eight channel relay contact closure/opening upon software command. Contact

status read back, operating on actual contacts not control bits.

Contacts individually selectable for Normally Open (NO) or Normally Closed

(NC) state at power up.

5.1 Technical

Relay Contact Specifications (See graph on following page)

Maximum Contact Carry Current 3 Amp

Maximum Switching Current 2 Amp DC, 1 Amp AC

Maximum Recommended Voltage 125 Volts DC, 100 Volts AC

Maximum Contact Power Rating 60 VA / 600 Watts

Contact Bounce Time Make 0.5 mSec

Break 0.5 mSec

Contact Response Time Make 5 mSec

Break 5 mSec

Contact Resistance 50 mOhm

Contact Life (operations) Electrical 500,000 At Full Load

Mechanical 50,000,000

Power Consumption 1.8 Watts maximum (All Relays On)

Address Overhead (Read/Write) 1 Address

Connections To Card 16 Way Male Connector (Additional

Plug-In Screw Connector Available)

Specification Page 7

Blue Chip Technology Ltd. 01270197.doc Page 7

Max Switching Current (AC)

Maximum Carrying Current

CONTACT VOLTAGE

Maximum Switching Current (DC)

00100

CONTACT CURRENT (Amps)

150 200 250

Diagram Showing Relay Contact Rating

Hatched area indicates recommended maxima.

Page 8 Electromagnetic Compatibility (EMC)

Page 801270197.doc Blue Chip Technology Ltd.

5.2 ELECTROMAGNETIC COMPATIBILITY (EMC)

This product meets the requirements of the European EMC Directive

(89/336/EEC) and is eligible to bear the CE mark.

It has been assessed operating in a Blue Chip Technology Icon industrial PC.

However, because the board can be installed in a variety of computers, certain

conditions have to be applied to ensure that the compatibility is maintained. It

meets the requirements for an industrial environment ( Class A product) subject

to those conditions.

• The board must be installed in a computer system which provides screening

suitable for the industrial environment.

• Any recommendations made by the computer system manufacturer/supplier

must be complied with regarding earthing and the installation of boards.

• The board must be installed with the backplate securely screwed to the

chassis of the computer to ensure good metal-to-metal (i.e. earth) contact.

• Most EMC problems are caused by the external cabling to boards. It is

important that any external cabling to the board is totally screened, and that

the screen of the cable connects to earth at both ends of the cable. It is

recommended that round screened cables with a braided wire screen are used

in preference to those with a foil screen and drain wire. With the terminal

block connection to the card there is no space available for an earth point on

the board mounting bracket. It is recommended that the screen be connected

to the metal body of the PC ( and hence earth) by the shortest possible “pig-

tail”. The BCT Icon chassis has these available adjacent to the expansion

area. Unscreened cable will not be adequate unless it is contained wholly

within the cabinetry housing the industrial PC and carefully routed.

Electromagnetic Compatibility Page 9

Blue Chip Technology Ltd. 01270197.doc Page 9

• To ensure that the board meets the industrial radiated field immunity of

10 V/metre, the cable should also be fitted with a ferrite clamp on the

external cable as close possible to the connector. The preferred type is the

Chomerics clip-on style, type H8FE-1004-AS.

• Ensure that the screen of the external cable is bonded to a good RF earth at

the remote end of the cable.

Failure to observe these recommendations may invalidate the EMC compliance.

Warning

This is a Class A product. In a domestic environment this

product may cause radio interference in which case the user may

be required to take adequate measures.

EMC Specification

A Blue Chip Technology Icon industrial PC fitted with this card meets the

following specification:

Emissions EN 55022:1995

Radiated Class A

Conducted Class A & B

Immunity pr EN 50082-2:1991 incorporating:

Electrostatic Discharge IEC 801-2:1984

Performance Criteria A

Radio Frequency Susceptibility IEC 801-3:1984

Performance Criteria A

Fast Burst Transients IEC 801-4:1988

Performance Criteria A

Page 10 Appendix A

Page 10 01270197.doc Blue Chip Technology Ltd.

APPENDICES

Appendix A - NUMBERING SYSTEMS

Binary and Hexadecimal Numbers

The normal numbering system is termed DECIMAL because there are ten

possible digits (0 to 9) in any single column of numbers. Decimal numbers are

also referred to as numbers having a Base 10. When counting, the numbers

increment in the units column from 0 up to 9. The next increment resets the

units column to 0 and carries over 1 into the next column. This 1 indicates that

there has been a full ten (the base number) counts in the units column. The

second column is therefore termed the “tens” column.

It is more convenient when programming to use a number system that provides

a clearer picture of the hardware at an operational or register level. The two

most common number systems used are BINARY and HEXADECIMAL.

These two systems provide an alternative representation to decimal numbers.

For a binary number there are only 2 possible values (0 or 1) and as a result

binary numbering is often known as Base 2. When counting in binary numbers,

the number increments the units column from 0 to 1. At the next increment the

units column is reset to 0 and 1 is carried over to the next column. This column

indicates that a full two counts have occurred in the units column. Now the

second column is termed the “twos” column.

Hexadecimal numbers may have 16 values (0 to 9 followed by the letters A to

F). It is also known as a system with the Base 16. With this counting system

the units increment from 0 to 9 as with the decimal system, but at the next count

the units column increments from 9 to A and then B, C and so on up to F. After

F the units column resets to 0 and the next column increments from 0 to 1.

This 1 indicates that sixteen counts have occurred in the units column. The

second column is termed the “sixteen’s” column.

Appendix A Page 11

Blue Chip Technology Ltd. 01270197.doc Page 11

The following table shows how the three systems indicate successive numbers

Decimal Binary Hexadecimal

Base 10 Base 2 Base 16

0 0 0 0 0 0 0 0 0

0 1 0 0 0 0 1 0 1

0 2 0 0 0 1 0 0 2

0 3 0 0 0 1 1 0 3

0 4 0 0 1 0 0 0 4

0 5 0 0 1 0 1 0 5

0 6 0 0 1 1 0 0 6

0 7 0 0 1 1 1 0 7

0 8 0 1 0 0 0 0 8

0 9 0 1 0 0 1 0 9

1 0 0 1 0 1 0 0 A

1 1 0 1 0 1 1 0 B

1 2 0 1 1 0 0 0 C

1 3 0 1 1 0 1 0 D

1 4 0 1 1 1 0 0 E

1 5 0 1 1 1 1 0 F

1 6 1 0 0 0 0 1 0

1 7 1 0 0 0 1 1 1

1 8 1 0 0 1 0 1 2

1 9 1 0 0 1 1 1 3

2 0 1 0 1 0 0 1 4

Notice how the next higher column does not increment until the lesser one to its

right has overflowed.

Binary representation is ideally suited where a visual representation of a

computer register or data is needed. Each column is termed a BIT (from Binary

digIT). Only five Bits are shown in the above table. With larger numbers,

more Bits are required. Normally Bits are arranged in groups of eight termed

BYTES. By definition there are 8 BITS per BYTE. Each Bit (or column) has a

value. In the binary table above the rightmost or least significant column each

digit has a value of 1. Each digit in the next column has a value of 2, the next

4, then 8 and so on.

The following diagram illustrates this.

BIT No 76543210

DECIMAL VALUE 128 64 32 16 8 4 2 1

Page 12 Appendix A

Page 12 01270197.doc Blue Chip Technology Ltd.

To determine the decimal value of a binary pattern, add up the decimal number

of each column containing a binary “1”.

BIT No 76543210

DECIMAL VALUE 128 64 32 16 8 4 2 1

BINARY NUMBER 11000110

The above example shows the binary pattern that is equivalent to 198 Decimal.

The binary string defining a Byte can be unwieldy. To make it less error prone,

the 8 bits forming a byte are divided into two groups of 4 bits, known as

NIBBLES. With four bits there are 16 possible numeric combinations

(including zero). A convenient method of representing each nibble is to use the

hexadecimal base 16 system.

When converting binary to hex, the byte is divided into nibbles each represented

by a single hex digit. This technique is applied to the selection of the base

address for the circuit board. The following diagram illustrates the construction

of a hex number.

BIT No 76543210

NIBBLE VALUE 84218421

BINARY NUMBER 11000110

ÀÄÄÄÄÄÄÂÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÂÄÄÄÄÄÄÙ

HEXADECIMAL: C6

Hexadecimal upper nibble = (1 x 8) + (1 x 4) + (0 x 2) + (0 x 1) = 12

lower nibble = (0 x 8) + (1 x 4) + (1 x 2) + (0 x 1) = 6

The resulting value is C6 Hex, since 12 Decimal equals C Hex.

Appendix A Page 13

Blue Chip Technology Ltd. 01270197.doc Page 13

Base Address Selection

Each column can be physically represented on the board by a pair of pins. In

practice, the boards cover a range of addresses (usually 16 Decimal). Therefore the

low order four bits are not included, but two higher order bits are added. This

gives an address range of 0 to 3F0 Hex . The following diagram shows a typical

set of pins.

Here a link is fitted to denote a binary or logic “0”, or left open to indicate a

binary or logic “1”. The example shows a base address setting of 300 Hex.

Page 14 Appendix B

Page 14 01270197.doc Blue Chip Technology Ltd.

APPENDIX B - PC MAPS

PC/XT/AT I/O Address Map

Address Allocated to:

000-01F DMA Controller 1 (8237A-5)

020-03F Interrupt Controller 1 (8259A)

040-05F Timer (8254)

060-06F Keyboard Controller (8742) Control Port B

070-07F RTC and CMOS RAM, NMI Mask (Write)

080-09F DMA Page Register (Memory Mapper)

0A0-0BF Interrupt Controller 2 (8259)

0F0 Clear NPX (80287) Busy

0F1 Reset NPX (80287)

0F8-0FF Numeric Processor Extension (80287)

1F0-1F8 Hard Disk Drive Controller

200-207 Reserved

278-27F Reserved for Parallel Printer Port 2

2F8-2FF Reserved for Serial Port 2

300-31F Reserved

360-36F Reserved

378-37F Parallel Printer Port 1

380-38F Reserved for SDLC Communications, Bisync 2

3A0-3AF Reserved for Bisync 1

3B0-3BF Reserved

3C0-3CF Reserved

3D0-3DF Display Controller

3F0-3F7 Diskette Drive Controller

3F8-3FF Serial Port 1

Appendix B Page 15

Blue Chip Technology Ltd. 01270197.doc Page 15

PC/XT Interrupt Map

Number Allocated to:

NMI Parity

0Timer

1Keyboard

2Reserved

3Asynchronous Communications (Secondary)

SDLC Communications

4Asynchronous Communications (Primary)

SDLC Communications

5Fixed Disk

6Diskette

7Parallel Printer

Page 16 Appendix B

Page 16 01270197.doc Blue Chip Technology Ltd.

PC/AT Interrupt Map

Level Allocated to:

CPU NMI Parity or I/O Channel Check

CTLR 1 CTLR 2 (Interrupt Controllers)

IRQ 0 Timer Output 0

IRQ 1 Keyboard (Output Buffer Full)

IRQ 2 Interrupt from CTLR 2

IRQ 8 Real-time Clock Interrupt

IRQ 9 S/w Redirected to INT 0AH (IRQ 2)

IRQ 10 Reserved

IRQ 11 Reserved

IRQ 12 Reserved

IRQ 13 Co-processor

IRQ 14 Fixed Disk Controller

IRQ 15 Reserved

IRQ 3 Serial Port 2

IRQ 4 Serial Port 1

IRQ 5 Parallel Port 2

IRQ 6 Diskette Controller

IRQ 7 Parallel Port 1

DMA Channels

0Memory Refresh

1Spare

2Floppy Disk Drive

3Spare