Keithley ERB-24 User manual

ERB-24
User’s Guide
A GREATER MEASURE OF CONFIDENCE

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4/02

ERB-24
User’s Guide
©1994, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Third Printing, June 2002
Document Number: 63930 Rev. C
New Contact Information
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, OH 44139
Technical Support: 1-888-KEITHLEY
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Fax: [phone]
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the use of this product. This product is not designed with components of a level of
reliability suitable for use in life support or critical applications.

Table of Contents
iii
Preface
1Overview
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
2Functional Description
3Setup
Unpacking the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Setting the AC Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
4Cabling and Wiring
Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Attaching to a PIO-12, PIO-24, µCPIO-12, or µCPIO-24 . . . . . .4-4
Attaching to the DAS-1600 or DAS-1200 Series . . . . . . . . . . . .4-5
Attaching to a PIO-96 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
5Programming
PIO-12 Relay Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
BASIC Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
6Troubleshooting
Problem Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
ASpecifications
BConnector Pin Assignments
37-Pin Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
50-Pin Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

iv
Index
List of Figures
Figure 2-1. ERB-24 Block Diagram. . . . . . . . . . . . . . . . . . . . .2-2
Figure 2-2. Typical Relay Channel. . . . . . . . . . . . . . . . . . . . . .2-2
Figure 3-1. ERB-24 Board Layout . . . . . . . . . . . . . . . . . . . . . .3-2
Figure 4-1. Pin Assignments of the 37-Pin Connector (J14) . .4-2
Figure 4-2. Pin Assignments of the 50-Pin Connector (J15) . .4-3
Figure 4-3. Attaching to a PIO-12, PIO-24, µCPIO-12, or
µCPIO-24 Board . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Figure 4-4. Attaching to a DAS-1600 or DAS-1200 Series
Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Figure 4-5. Attaching to a PIO-96 Board . . . . . . . . . . . . . . . . .4-6
Figure B-1. Pin Assignments for the 37-Pin Connector (J14) B-1
Figure B-2. Pin Assignments for the 50-Pin Connector (J15) B-2
List ofTables
Table 5-1. PIO-12 Relay Signals. . . . . . . . . . . . . . . . . . . . . . .5-1
Table 6-1. Troubleshooting Information. . . . . . . . . . . . . . . . .6-2
Table A-1. ERB-24 Specifications. . . . . . . . . . . . . . . . . . . . . A-1

v
Preface
This manual describes how to cable, wire, program, and use ERB-24
relay output boards with digital I/O boards, such as the PIO-12.
This guide serves data acquisition system designers, engineers,
technicians, programmers, scientists, and other users responsible for
setting up, cabling, wiring, and writing programs that access the
functionality of the ERB-24 board. This guide assumes that you are
familiar with data acquisition and programming principles and with your
particular application.
The ERB-24 User’s Guide is organized as follows:
●Chapter 1 briefly describes the features, applications, and accessories
supported by the ERB-24.
●Chapter 2 describes the features of the ERB-24 in more detail and
provides a block diagram of the board.
●Chapter 3 describes how to unpack and set up the ERB-24 board.
●Chapter 4 describes how to attach the ERB-24 to digital I/O boards.
●Chapter 5 provides an example of accessing the functionality of an
ERB-24 board using a PIO-12 board and the BASIC programming
language.
●Chapter 6 provides troubleshooting information and information on
how to obtain technical support and repairs for the ERB-24.
●Appendix A lists the specifications for the ERB-24.
●Appendix B lists the connector pin assignments for the ERB-24.
An index completes this guide.

1-1
1
Overview
The ERB-24 is a 24-channel relay output board. This chapter describes
the features and typical applications of the ERB-24 and the accessories
provided for the board.
Features
The ERB-24 is compatible with the PIO-12, PIO-24, PIO-96, µCPIO-12,
and µCPIO-24 digital I/O boards. The ERB-24 is also compatible with the
digital I/O section of the DAS-1600 Series and DAS-1200 Series boards.
The ERB-24 provides the following features:
●24 double-pole, double-throw relays (dual form C)
●3 A contact rating (120 Vrms)
●Built-in power supply
●Screw terminals that accept 12-22 AWG wire
●LEDs that indicate activated relays
●37-pin connector
●50-pin connector

1-2 Overview
Applications
The following are typical applications for the ERB-24:
●Energy management
●Laboratory automation
●Product testing
●Process control
●Alarm activation
●Annunciator lighting
Accessories
The optional accessories for the ERB-24 board include the following:
●C-1800 - Cable for connecting an ERB-24 to a PIO-12, PIO-24,
µCPIO-12, µCPIO-24, DAS-1600 Series, or DAS-1200 Series board.
The standard cable is 1.5 feet long. The C-1800 cable is available in
different lengths, if required. Refer to the Keithley MetraByte catalog
for more information on ordering the C-1800 in different lengths.
●CACC-2000 - Cable for connecting an ERB-24 to a PIO-96 digital
I/O board.
●RMT-02 - Rack-mountable enclosure. The RMT-02 installs into any
standard 19-inch rack, such as a Keithley MetraByte RMF-06 or
RTT-02.
●SFC-37 - 37-pin mating connector for making custom digital inputs.

2-1
2
Functional Description
Each of the 24 relays on the ERB-24 board is supported by its own
control line. The relay is an electromechanical, dual form C (double-pole,
double-throw) module capable of switching loads under program control.
The electromechanical relays offer zero-leakage output currents.
Each relay contains two normally open contacts and two normally closed
contacts. Each contact can switch up to 3 A (resistive) at 120 Vrms.
The ERB-24 provides both a 37-pin and a 50-pin connector. The 37-pin
connector is provided for connecting to a PIO-12, PIO-24, µCPIO-12, or
µCPIO-24 digital I/O board or to the 37-pin auxiliary connector on a
DAS-1600 Series or DAS-1200 Series board. The 50-pin connector is
provided for connecting to a PIO-96 digital I/O board.
A 5 V signal applied to the corresponding relay control pin on the
connector energizes the relay. Onboard transistor drivers allow control of
the ERB-24 by any LSTTL- or NMOS/ CMOS-compatible digital output
board.
The ERB-24 contains an annunciator LED for each relay for purposes of
monitoring and troubleshooting. Each annunciator LED lights when its
associated relay is energized.
The board also contains its own power supply. The power supply operates
on 115/230 VAC and accepts 15% voltage fluctuations. Operating
temperatures range from 0°to 60°C.
A block diagram of the ERB-24 board is shown in Figure 2-1. Figure 2-2
shows the circuitry for a single relay channel.

2-2 Functional Description
Figure 2-1. ERB-24 Block Diagram
Figure 2-2. Typical Relay Channel
24 Darlington
Transistor
Drivers
Relay 0
Relay 23
Relays
0 to 23
.
.
.
.
.
.
For Relays
0 to 23
.
.
Power
Supply
TTL
Signals
From
Digital
I/O
Board
115/230 V
at
50/60 Hz Notes: NC = Normally Closed
NO = Normally Open
C = Common
.
.
.
NC A
NO A
C A
NC B
NO B
C B
NC A
NO A
C A
NC B
NO B
C B
RELAY “X”
FROM
DIGITAL I/O
BOARD
DIG
COM
2.7K
7.2K 3.0K
MOTOROLA
ULN2803/8
+24V
NO B NC B
COM B
NO A NC A
COM A
NO = NORMALLY OPEN
NC = NORMALLY CLOSED

3-1
3
Setup
This chapter describes how to set up your ERB-24 board. If you
encounter any problems with the board after setting it up, refer to
Chapter 6 for troubleshooting information.
Unpacking the Board
Caution: A discharge of static electricity from your hands can seriously
damage certain electrical components on any circuit board. It is
recommended that you use wrist strap grounds when handling a board. If
a wrist strap ground is not available, make sure that you discharge static
electricity from yourself by touching a grounded conductor such as your
computer chassis (your computer must be turned off).
Whenever you handle a board, hold it by the edges and avoid touching
any board components.
Use the following procedure to unpack an ERB-24 board:
1. Remove the board from its anti-static wrapping material. You may
wish to store the wrapping material for possible future use.
2. Inspect the board for signs of damage. If damage is apparent, arrange
to return the board (see page 6-2).
3. Check the remaining contents of your package against the packing
list to be sure your order is complete. Report any missing items,
immediately.

4. Once you have determined that the board is acceptable, select the
appropriate AC line voltage, as described in the next section.
Setting the AC Line Voltage
Caution: Be sure to set the AC line voltage for the voltage you are using before
connecting the ERB-24 to line power. The default setting is 115 V.
The 115/230 AC Line Voltage Selector is a 2-position slide switch located as
shown in Figure 3-1. To change the line voltage setting, slide the switch to the
appropriate setting (115 V or 230 V) marked on the switch.
Figure 3-1. ERB-24 Board Layout
Once you have set the AC line voltage, you can attach accessories and wire appli-
cations to the ERB-24 board, as discussed in Chapter 4.
37-Pin Connector AC Line
Voltage
Selector
AC
Power
Input
Screw Terminals
Screw Terminals
Transformer
J13
J14
LEDS
J15, 50-Pin Connector Fuse
0123 45 678 9
10 11
23 22 21 20 19 18 17 16 15 14 13 12
3-2 Setup

4-1
4
Cabling andWiring
Once you have set up the ERB-24, you can attach accessories and wire
applications to the board. This chapter describes the pin assignments of
the connectors on the ERB-24 and how to attach the ERB-24 to digital
I/O boards.
Connector Pin Assignments
The ERB-24 board contains two connectors: a 37-pin, D-type, male
connector (J14) and a 50-pin connector (J15), shown in Figure 3-1. The
pin assignments of the 37-pin connector are shown in Figure 4-1; the pin
assignments of the 50-pin connector are shown in Figure 4-2.

4-2 Cabling and Wiring
Figure 4-1. Pin Assignments of the 37-Pin Connector (J14)
N/C Pin 19
N/C Pin 18
N/C Pin 17
N/C Pin 16
N/C Pin 15
N/C Pin 14
N/C Pin 13
N/C Pin 12
DIG COM Pin 11
Relay 16 Pin 10
Relay 17 Pin 9
Relay 18 Pin 8
Relay 19 Pin 7
Relay 20 Pin 6
Relay 21 Pin 5
Relay 22 Pin 4
Relay 23 Pin 3
N/C Pin 2
N/C Pin 1
Pin 37 Relay 0
Pin 36 Relay 1
Pin 35 Relay 2
Pin 34 Relay 3
Pin 33 Relay 4
Pin 32 Relay 5
Pin 31 Relay 6
Pin 30 Relay 7
Pin 29 Relay 8
Pin 28 Relay 9
Pin 27 Relay 10
Pin 26 Relay 11
Pin 25 Relay 12
Pin 24 Relay 13
Pin 23 Relay 14
Pin 22 Relay 15
Pin 21 DIG COM
Pin 20 N/C

4-3
Figure 4-2. Pin Assignments of the 50-Pin Connector (J15)
Relay 7 Pin 1
Relay 6 Pin 3
Relay 5 Pin 5
Relay 4 Pin 7
Relay 3 Pin 9
Relay 2 Pin 11
Relay 1 Pin 13
Relay 0 Pin 15
Relay 15 Pin 17
Relay 14 Pin 19
Relay 13 Pin 21
Relay 12 Pin 23
Relay 11 Pin 25
Relay 10 Pin 27
Relay 9 Pin 29
Relay 8 Pin 31
Relay 23 Pin 33
Relay 22 Pin 35
Relay 21 Pin 37
Relay 20 Pin 39
Relay 19 Pin 41
Relay 18 Pin 43
Relay 17 Pin 45
Relay 16 Pin 47
N/C Pin 49
Pin 2 Gnd
Pin 4 Gnd
Pin 6 Gnd
Pin 8 Gnd
Pin 10 Gnd
Pin 12 Gnd
Pin 14 Gnd
Pin 16 Gnd
Pin 18 Gnd
Pin 20 Gnd
Pin 22 Gnd
Pin 24 Gnd
Pin 26 Gnd
Pin 28 Gnd
Pin 30 Gnd
Pin 32 Gnd
Pin 34 Gnd
Pin 36 Gnd
Pin 38 Gnd
Pin 40 Gnd
Pin 42 Gnd
Pin 44 Gnd
Pin 46 Gnd
Pin 48 Gnd
Pin 50 Gnd

4-4 Cabling and Wiring
Attaching to a PIO-12, PIO-24, µCPIO-12, or µCPIO-24
To attach the ERB-24 to a PIO-12, PIO-24, µCPIO-12, or µCPIO-24
digital I/O board, connect a C-1800 cable to the 37-pin connector on the
ERB-24 (J14), as shown in Figure 4-3.
Figure 4-3. Attaching to a PIO-12, PIO-24, µCPIO-12, or µCPIO-24 Board
ERB-24
PIO-12, PIO-24,
µCPIO-12, or
µCPIO-24 board
C-180
0
J14

4-5
Attaching to the DAS-1600 or DAS-1200 Series
To attach the ERB-24 to a DAS-1600 or DAS-1200 Series board, first
attach the DAS board end of the PIO cable that comes with the DAS-1600
and DAS-1200 Series boards to the PIO cable connector (J2) on the DAS
board. Next, install the 37-pin D-type connector of the PIO cable in the
connector panel next to the main I/O connector (J1) of the DAS-1600 or
DAS-1200 Series board. Finally, attach connector J14 on the ERB-24 to
the 37-pin D-type connector of the PIO cable with the C-1800 cable.
Figure 4-4 illustrates these connections.
Figure 4-4. Attaching to a DAS-1600 or DAS-1200 Series Board
DAS-1600 or
DAS-1200 Series board
C-1800 cable
J2
PIO cable ERB-24
J14

4-6 Cabling and Wiring
Attaching to a PIO-96
You can attach up to four ERB-24 boards to a PIO-96 digital I/O board.
To attach an ERB-24 to a PIO-96, connect the CACC-2000 cable to the
50-pin connector (J15) on the ERB-24 board and to the 50-pin connector
on the PIO-96, as shown in Figure 4-5.
Figure 4-5. Attaching to a PIO-96 Board
PIO-96 board
ERB-24
ERB-24
ERB-24
J1
J2
J3J4
ERB-24
CACC-2000
Cable
J15
J15
CACC-2000
Cable
CACC-2000
Cable
CACC-2000
Cable
J15
J15