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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
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.
v
Features
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.
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
1-1
Applications
Accessories
The following are typical applications for the ERB-24:
●Energy management
●Laboratory automation
●Product testing
●Process control
●Alarm activation
●Annunciator lighting
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.
1-2Overview
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.
2-1
2-2Functional 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
7.2K3.0K
MOTOROLA
ULN2803/8
+24V
NO BNC B
COM B
NO ANC A
COM A
NO = NORMALLY OPEN
NC = NORMALLY CLOSED
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).
3
Setup
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.
3-1
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 applications 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
0
1
23
45
6
78 9
10
11
23
22
2120
1918171615141312
3-2 Setup
Cabling and Wiring
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.
Figure 4-2. Pin Assignments of the 50-Pin Connector (J15)
4-3
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.
PIO-12, PIO-24,
µCPIO-12, or
µCPIO-24 board
J14
C-180
0
Figure 4-3. Attaching to a PIO-12, PIO-24, µCPIO-12, or µCPIO-24 Board
ERB-24
4-4Cabling and Wiring
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.
J2
PIO cable
DAS-1600 or
DAS-1200 Series board
C-1800 cable
J14
Figure 4-4. Attaching to a DAS-1600 or DAS-1200 Series Board
ERB-24
4-5
Attaching to a PIO-96
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
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
4-6Cabling and Wiring
This chapter provides an example of how to activate relays on the
ERB-24 using a PIO-12 digital I/O board and BASIC as the programming
language.
PIO-12 Relay Signal Names
Table 5-1 lists the PIO-12 signal names and the corresponding ERB-24
relays.
5
Programming
Table 5-1. PIO-12 Relay Signals
RelaySignalRelaySignal
0PA012PC4
1PA113PC5
2PA214PC6
3PA315PC7
4PA416PB0
5PA517PB1
6PA618PB2
7PA719PB3
8PC020PB4
9PC121PB5
10PC222PB6
11PC323PB7
5-1
BASIC Example
The following simple BASIC program activates relays on the ERB-24
used with a PIO-12 board:
10 OUT &H313, &H80 ’Sets all PIO-12 ports to outputs
20 OUT &H310, 1 ’Activates relay 0 (Port A, Bit 0)
30 OUT &H311, 16 ’Activates relay 20 (Port B, Bit 4)
40 OUT &H312, 3 ’Activates relays 8 and 9
’(Port C, Bits 0 and 1)
5-2Programming
If your ERB-24 board is not operating properly, use the information in
this chapter to help you isolate the problem. If the problem appears
serious enough to require technical support, refer to page 6-2 for
information on how to contact an applications engineer.
Problem Isolation
If you encounter a problem with an ERB-24 board, use the
troubleshooting information in Table 6-1 to try to isolate the problem.
Table 6-1 lists general symptoms and possible solutions for problems
with ERB-24 boards.
6
Troubleshooting
6-1
Table 6-1, Troubleshooting Information
If your board is not operating properly after using the information in Table 6-1,
refer to the next section for information on how to contact an applications
engineer.
Technical Support
Before returning any equipment for repair, call Keithley for technical support at:
1-888-KEITHLEY
Monday - Friday, 8:00 A.M. - 5:00 P.M., Eastern Time
SymptomPossible CausePossible Solution
Board does
not respond
The board is damaged.Contact the Keithley Applications Engineering
Department; see page 6-2
Bad cable or cable not
connected.
Check cable connections. Replace cable if defective.
No A/C or power cord not
plugged in.
Check power connections to board.
Intermittent
operation
Vibrations or loose connections exist.
Cushion source of vibration and tighten connections. Check cable.
The board is overheating.Check environmental and ambient temperature.
See the documentation for your computer for
specifications.
Electrical noise exists.Provide better shielding or reroute wiring.
Data appears
to be invalid
An open connection
exists.
Check wiring to screw terminal.
Outputs not indicating
proper level.
Check that the circuit is complete (are both relay
and connections used?).
You may need to apply pull-up resistors for the
external source.
6-2 Troubleshooting
An applications engineer will help you diagnose and resolve your
problem over the telephone. Please make sure that you have the following
information available before you call:
Serial #_____________________
Base address_____________________
Interrupt selection_____________________
ComputerManufacturer_____________________
CPU type8088, 286, 386, 486,
Pentium, ____________
Clock speed (MHz)8 12 20 25 33 ____
Math coprocessorYes No
Amount of RAM_____________________
Video systemCGA Hercules EGA VGA
BIOS type_____________________
Operating systemDOS version_____________________
Windows version3.0 3.1 _____________
Windows modeStandard Enhanced
If a telephone resolution is not possible, the application engineer will issue you a Return
Material Authorization (RMA) number and ask you to return the equipment.Include the
RMA number with any documentation regarding the equipment.
When returning equipment for repair, include the following information:
• Your name, address, and telephone number.
• The invoice or order number and date of equipment purchase.
• A description of the problem or its symptoms.
• The RMA number on the outside of the package.
Notes: If you are submitting your equipment for repair under warranty, you must
include the invoice number and date of purchase.
To enable Keithley Instruments, Inc., to respond as quickly as possible, you must
include the RMA number on the outside of the package.
6-4 Troubleshooting
Specifications
Table A-1 lists the specifications for the ERB-24.
Table A-1. ERB-24 Specifications
FeatureAttributeSpecification
RelaysQuantity and type24 DPDT, dual form C
Contact materialGold overlay silver
Contact rating3 A at 28 VDC, resistive
3 A at 120 VAC, resistive
1.6 A at 220 VAC
A
Operate time20 ms maximum at rated voltage
Release time10 ms maximum
Life expectancy
Mechanical
Electrical
EnvironmentalOperating temperature range
Storage temperature range
Humidity
Power
Consumption
Input power115 VAC ±15% (2 A fuse)
107 operations/minute
105 operations/minute at
rated load
0° to 60°C
−40° to +100°C
0 to 90% noncondensing
230 VAC ±15% (1 A fuse)
50/60 Hz, 14.5 VA maximum
A-1
Table A-1. ERB-24 Specifications (cont.)
FeatureAttributeSpecification
PhysicalDimensions16-inches long by 4.75-inches
wide by 2-inches high
(40.6 cm long by 12.1 cm wide
by 5.1 cm high)
Weight2.2 lb (1 kg)
Screw terminal wire spacing0.197 inches (5 mm)
Screw terminal wire sizes12-22 AWG
Mounting screws for boards4-40
A-2Specifications
Connector Pin Assignments
This appendix contains the pin assignments for the ERB-24 board
connectors.
37-Pin Connector
Pin assignments for the 37-pin connector, J14, on the ERB-24 are shown
in Figure B-1.
screw terminals 1-1
setting the AC line voltage 3-2
setting up the ERB-24 3-1
SFC-37 1-2
specifications A-1
T
P
pin assignments 4-1
37-pin connector 4-2, B-1
50-pin connector 4-3, B-2
PIO cable 4-5
PIO-12 1-1
attaching 4-4
relay signal names 5-1
PIO-24 1-1
attaching 4-4
PIO-96 1-1
attaching 4-6
power supply 1-1, 2-1
problem isolation 6-1
programming 5-1
technical support 6-2
transistor drivers 2-1
troubleshooting 6-1
U
unpacking the board 3-1
W
warranty repairs 6-4
X-2Index
Specifications are subject to change without notice.
All Keithley trademarks and trade names are the property of Keithley Instruments, Inc. All other trademarks and
trade names are the property of their respective companies.