National Instruments OAC5A, OAC5, ODC5 User Manual
USER GUIDE
SSR S
ERIES
M
ODULES AND BACKPLANES
This guide describes the mechanical and electrical aspects of the solid state
relay (SSR) Series modules and backplanes. It also describes how to install
and configure them for use with National Instruments data acquisition
(DAQ) devices. The SSR Series consists of the following digital signal
conditioning modules and backplanes:
• Output modules
– OAC5
– OAC5A
– ODC5
• Input modules
–IAC5
–IAC5A
–IDC5
• Backplanes
– 8-module
– 16-module
– 24-module
– 32-module
Introduction
You can use the SSR Series digital signal conditioning modules with your
PC and National Instruments DAQ devices to control or sense voltages
from field devices. The SSR modules are high-performance, fully
encapsulated devices that interface the PC to field devices via optical
isolation. These modules plug into one of the SSR backplanes, which are
available with 8-, 16-, 24-, and 32-module capacities. Each backplane has
screw terminals for field connections. A 50-pin connector connects the
backplane to the DAQ device. The backplanes also have light emitting
diodes (LEDs) that indicate the status of each SSR module.
Product and company names are trademarks or trade names of their respective companies.
371174A-01© Copyright 1990, 1998 National Instruments Corp. All rights reserved.September 1998
What You Need to Get Started
To set up and use the SSR Series modules and backplanes you need
the following:
❑ SSR Series module backplane kit and documentation
❑ SSR Series module
❑ National Instruments DAQ device
❑ Cable and/or SC-205X device
❑ Number 1 and number 2 Phillips-head screwdrivers
❑ ¼ in. flat-head screwdriver
Module Operation
SSR modules optically isolate the field signals from the computer,
preventing any possibility of damage to the computer by overvoltage
transients on these lines. The optical isolation is rated for surges up
to 4,000 V.
Note
All SSR modules use negative logic.
Input Modules
Output Modules
Input SSR modules sense voltages from a field source and return a logic
value to the National Instruments DAQ device. If a voltage within the
selected input range for the input module is present, it returns a logic low
signal to the DAQ device, otherwise it returns a logic high signal.
Output SSR modules sense a logic value from the DAQ device to control
external devices. They control power in a manner similar to conventional
relays. If the DAQ device sends a logic low signal, the output module turns
on and current flows. If the DAQ device sends a logic high signal, the
output module turns off.
Output SSR modules are similar to conv entional relays, b ut there are some
important differences. Unlike conventional relays, these solid state relays
require voltage on the load side. Current needs to flow through them in the
on state, or they turn off even if a logic low signal is at their input. This
occurrence is referred to as dropout. If a solid state relay drops out, you
must turn it off with a logic high signal before you can turn it on again.
SSR Series Modules and Backplanes 2
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National Instruments Corporation
The dropout voltage and current specifications for the output modules are
given in the Manufacturer Data Sheets section. For most control
applications, such as controlling motors or lamps, these requirements are
not difficult to meet.
A second difference between these output modules and conv entional relays
is that they do not turn off completely. A small leakage current flows all the
time even in the off state. F or most control applications, this current causes
no problems.
Output SSR modules require a certain amount of current from the digital
control for the module to turn on. If the DAQ device sends a logic high
signal, the output module turns off and no current flows. If the DA Q device
sends a logic low signal, the output module turns on and current flows from
the +DC control or V
enough to turn on the output module. If the DAQ device or digital control
cannot sink enough current through the -DC control, the module does not
turn on. Refer to T able 1 to find the minimum logic control current required
to turn on each output module.
Table 1. Minimum Control Logic Current Required
Output Module Control Current
ODC5 5 mA
to the -DC control. This current must be large
cc
OAC5 12 mA
OAC5A 12 mA
Note Make sure you pair the output module with a DAQ device that provides sufficient
control current. F or example, the following National Instruments DA Q devices do
not work reliably with the SSR-OAC-5 and SSR-OAC-5A: the DIO-24 (6503),
DIO-96 (6508), Lab/1200 Series, AT-MIO-16D/AT-MIO-16DE extended DIO
lines, DAQCard-700, PC-LPM-16, and PC-AO-2DC.
SSR Backplanes
This section describes the SSR backplane in detail including connection,
function, SSR module installation, and field connections.
Connection
All four SSR backplanes function similarly, but they accommodate a
different number of modules. Each backplane has a special cabling scheme
to maximize the number of modules in use.
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National Instruments Corporation 3 SSR Series Modules and Backplanes
The SSR backplanes are divided into ports of eight modules each. The
8-, 16-, 24-, and 32-module backplanes have one, two, three, and four
ports respectively.
Table 2 shows backplanes that need an interface to convert the digital
input/output (DIO) lines to map correctly. Table 2 also shows cables that
are available for connecting D A Q devices and SSR backplanes. Refer to the
National Instruments catalogue if your system is not listed in the table.
Table 2. SSR Backplane Cabling Guide
8-Module
DAQ Device
DIO-24 (6503)
except
DAQCard-DIO-24
DAQCard-DIO-24 PSH27-50F-D11
DIO-32HS (6533) SC-205X adapter
DIO-96 (6508) SC-205X adapter
50-pin MIO Series,
68-pin MIO E
(60xx) Series,
Lab/1200 Series,
DA QCard-700,
PC-LPM-16,
PC-AO-2DC
100-pin MIO E
(60xx) Series
1
These cables are available separately and are not included with the SSR Series backplane.
2
This adapter is available separately. See the National Instruments Catalogue for information about cabling to connect an
SC-205X to your DAQ device.
NA means not applicable
Backplane
NB1 cable
or SC-205X adapter
(via NB8 cable)
cable or SC-205X
adapter (via NB8
cable)
2
(via NB8 cable)
2
(via NB8 cable)
SC-205X adapter
(via NB8 cable)
R1005050 cable
or SC-205X adapter2
(via NB8 cable)
2
1
2
16-Module
Backplane
NB1 cable NB1 cable NA
PSH27-50F-D11
cable
NA NA R6850-D1 cable
SC-205X adapter
(via NB8 cable)
NA NA NA
R1005050 cable
1
24-Module
Backplane
PSH27-50F-D11
cable
SC-205X adapter
(via NB8 cable)
R1005050 cable
32-Module
Backplane
NA
NA
1
NA
1
If you need an interface, use the SC-205X Series devices. You can connect
backplanes that do not need an SC-205X Series device directly to a DAQ
device because the modules map directly to one or more DIO ports.
The SC-205X Series devices break out different DIO ports for use with
different products. For information on connecting, mounting, and cabling
your DIO ports using the SC-205X, see your SC-205X Series User Manual.
SSR Series Modules and Backplanes 4
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National Instruments Corporation
Caution Do not attempt to connect the SSR backplane to a host computer DAQ device for
!
which it was not designed. Such connections can damage any or all SSR modules,
the host computer, and the DAQ device. National Instruments is not liable for any
damages resulting from incorrect connections.
The 32-module backplane connects the PCLK1 (OUT1) and PCLK2 (OUT2)
signals of the DIO-32HS (6533) device to ground. When using a 32- module
backplane, do not configure a device fo r any mode that uses the PCLK1 or PCLK2
line. Specifically, do not configure the DIO-32HS (6533) for burst handshaking
mode, which uses PCLK, or write any data to port 4, which is the port that includes
the PCLK1 and PCLK2 lines. Incorrect configuration can damage the host
computer and your DAQ device. National Instruments is not liable for any
damages resulting from incorrect configuration.
Configuring the Power Supply
This section describes how to configure the SSR backplane jumpers to get
+5 VDC power to the SSR modules.
Y ou can po wer the SSR module backplanes by either the D A Q device or an
external power supply . You need external power when connecting to a D A Q
device that does not supply external power or when the power needed for
the SSR modules and any other accessories exceeds the power supplied by
the DAQ device. Different DAQ devices supply different amounts of
power; for example many supply 1 A. See the specifications of your device
for more information.
The current needed for the SSR modules and accessories is the sum of the
maximum logic supply current of all SSR modules connected to the DAQ
device plus any other current needed by accessories connected to the same
DAQ device.
T o conf igure the SSR module backplane for external po wer or D AQ device
power you need to set a jumper on the backplane. This can be just a wire
jumper or it can be a fuse. If you use a wire jumper, you need to fuse the
logic power supply somewhere before the backplane.
Figures 1 through 7 show the backplane power jumper locations, which are
not clearly marked on the backplane. Install only one jumper at a time. If
you install both jumpers, you can damage the supply or SSR module
backplane.
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National Instruments Corporation 5 SSR Series Modules and Backplanes
1
25/49
-+
1
+
16 23456789101112131415
2
AC INPUT
AC OUTPUT
Y
B
DC INPUT
DC OUTPUT
R
W
1234567
0
Note: No External Power Jumper Locations, remove all DAQ device
power jumpers for external power connection.
1 DAQ Device Power Jumper Location (use only one) 2 Not Used
Figure 1. Grayhill 8 Module Backplane Jumper Locations
1
+–
AC INPUT
Y
AC OUTPUT
B
DC INPUT
W
DC OUTPUT
R
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
2
Note: No External Power Jumper Locations, remove all DAQ device
power jumpers for external power connection.
1 DAQ Device Power Jumper Location 2 Not Used
Figure 2. Grayhill 16 Module Backplane Jumper Locations
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
– +
12
1 External Power Jumper 2 DAQ Device Power Jumper
Figure 3. Grayhill 24 Module Backplane Jumper Locations
SSR Series Modules and Backplanes 6
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National Instruments Corporation
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
AC INPUT
Y
AC OUTPUT
B
DC INPUT
W
DC OUTPUT
R
Note: No DAQ Device Power Jumper Location
1 External Power Fuse
1
Figure 4. Grayhill 32 Module Backplane Jumper Locations
Note
The Grayhill 32-module backplane can be powered only by an external power
supply. There are no jumper settings. There is a fuse on the external power supply .
1
2
3
1 External Power Jumper 2 DAQ Device Power Jumper 3 Not Used
Figure 5. Crouzet 8 Module Backplane Jumper Locations
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National Instruments Corporation 7 SSR Series Modules and Backplanes
1
2
3
1 External Power Jumper 2 DAQ Device Power Jumper 3 Not Used
Figure 6. Crouzet 16 Module Backplane Jumper Locations
1 2
1 External Power Jumper 2 DAQ Device Power Jumper
Figure 7. Crouzet 24 Module Backplane Jumper Locations
Note
The Crouzet 32 module backplane has no position on the backplane for either a
fuse or jumper . You must add a power supply fuse elsewhere before connecting the
power. Use a fuse that is suitable for your application.
SSR Module Installation
You can install the SSR modules by plugging each module into one of the
positions on an SSR backplane. They are keyed so they cannot be inserted
incorrectly. Many DAQ devices require that all DIO lines in a port be
configured either for input or output. In these cases make sure you install
the same type of SSR module, input or output, for each line in the port.
You can mix input and output SSR modules on the mounting rack only if
you connect them to different I/O ports or you use a DA Q device that allows
mixed line directions within a port. Do not attach input modules to output
lines under any circumstances or you can damage the SSR modules or the
DAQ device.
LEDs
Each module position of an SSR backplane has a status LED to show the
status of the SSR module logic line. For input modules, the LED is on when
the load voltage is within the specified range of the SSR module. For the
SSR Series Modules and Backplanes 8
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National Instruments Corporation
Signal Connections
User Signal
Source
IAC 5
90 to 140 VAC
output modules the LED is on when the module is turned on. See the
Manufacturer Data Sheets section for further information.
Connect external devices to the SSR modules using the screw terminals.
Two screw terminals are dedicated to each module. Screw terminal
pair 1 and 2 are for module 0, terminal pair 3 and 4 are for module 1, and
so on. In the case of the DC modules, the odd numbered screw terminal is
always the positive terminal and the even numbered screw terminal is the
negative terminal. On the load side, a 5 A fuse protects each module. This
fuse is always located on the even numbered or negative screw terminal to
the module. Figures 8 through 11 show typical signal connections. See the
Manufacturer Data Sheets section for further information.
IAC 5 (22 k )
IAC 5A (60 k )
AC
Odd Backplane
Terminal
Input
Module
IAC 5A
180 to 280 VAC
User Power
Source
0AC 5
24 to 140 VAC
0AC 5A
24 to 280 VAC
Load
Even Backplane
Terminal
5 A
Figure 8.
Odd Backplane
Terminal
Even Backplane
Terminal
5 A
Figure 9.
Digital Signal Conversion
to DAQ Device
IAC5 and IAC5A Signal Connections
AC
Output
Module
Snubber
Trigger
Circuit
OAC5 and OAC5A Signal Connections
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National Instruments Corporation 9 SSR Series Modules and Backplanes
User Signal
Source
3 to 32 VDC
+
–
Load
+
–
Odd Backplane
Terminal
Even Backplane
Terminal
Odd Backplane
Terminal
80 VDC
Even Backplane
Terminal
1.8 k
Digital Conversion
Signal to
DAQ Device
5 A
Figure 10. IDC5 Signal Connections
Digital Signal
Conversion
Voltage
Spike
Protection
from
DAQ Device
Output
Input
DC
Module
Output
DC
Module
Figure 11. ODC5 Signal Connections
Manufacturer Data Sheets
This section contains the manufacturing data sheets of Grayhill
Corporation
The Grayhill data sheets include the 70-OAC5 and 70-OAC5A AC output
modules; 70-ODC5 DC output module; 70-IAC5 and 70-IAC5A AC input
modules; 70-IDC DC input module; and 70-RCK8, 70-RCK16,
70-RCK24, and 70-RCK32-HL mounting racks.
The Crouzet data sheets include the IAC5, IAC5A, and IAC 0.6 in. digital
input modules; OAC5, OAC5A, and ODC 0.6 in. digital ou tput modules;
and PB-8H, PB-16H, PB-24, and PB-32D 0.6 in. digital I/O mounting
boards.
1
Copyright Grayhill, Inc. 1998. Reprinted with permission of the copyright owner. All rights reserved. Grayhill, Inc.
Grayhill Control Products Catalog #7
2
Copyright Crouzet, Inc. 1996. Reprinted with permission of the copyright owner. All rights reserved. Crouzet, Inc.
1998/1999 Automation Controls Catalog
SSR Series Modules and Backplanes 10
1
and Crouzet Corporation2.
©
National Instruments Corporation
AC OUTPUT MODULES
70G-OAC 70-OAC 70M-OAC
Maximum Current Versus
Ambient Temperature
The chart indicates continuous current to limit the
junction temperatures to 100˚C. Information is
based on steady state heat transfer in a 2 cubic
foot sealed enclosure.
4
3
2
1
LOAD CURRENT (AMPS)
- 40 - 20 0 20 40 60 80 100
* *
••
TUV Rheinland
STANDARD & G5 PACKAGE
MINIATURE PACKAGE
AMBIENT TEMPERATURE (˚C)
Figure 1
FEATURES
• Transient Protection: Meets the
requirements of IEEE 472, “Surge
Withstanding Capability Test”
• SPST, Normally Open
• Zero Crossing Turn-On
• UL Recognized, CSA Certified
• G5 Modules Passed IEC801.2,
IEC801.3, and IEC801.4
• 4000 Vac Optical Isolation
• G5 Modules Provide Replaceable
5 x 20 mm Glass Fuse and Built-in
Status LED
• Lifetime Warranty
CIRCUITRY
Fuse and Status LED in G5 modules only.
1
LOAD
VAC
SNUBBER
2
LOAD
TRIGGER
CIRCUIT
Rx
3
+
DC CONTROL
Trigger circuit provides zero voltage turnon except for part numbers 70-OAC5A5
and 70-OAC5A-11, which have random
(fast) turn-on.
4
–
Maximum Peak Surge Current
Versus Surge Duration
Information is based on a supply frequency of
60 Hz sinusoidal and a resistive or inductive load.
Application of maximum surge current may not be
repeated until the module temperature has returned to its steady state value.
300
200
100
80
60
40
30
20
10
6
4
3
1
1
PEAK SURGE CURRENT (AMPERES)
12346 2010 40 60 100
NUMBER OF FULL CYCLES AT 60 HERTZ
DIMENSIONS
For complete dimensional drawings, see pages
29-30.
G5 FUSES
Fuses are 5 Amp Littlefuse part number 217005 or
equivalent.
*Part Numbers: 70G-OAC5
1000
70G-OAC5A
70G-OAC5A-11
70G-OAC15
70G-OAC15A
70G-OAC24
70G-OAC24A
Figure 2
32
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National Instruments Corporation 11 SSR Series Modules and Backplanes
An ISO-9001 Company
561 Hillgrove Avenue • LaGrange, Illinois 60525 • USA • Phone: (708) 354-1040 • Fax: (708) 354-2820 • http://www.grayhill.com
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