Allen-Bradley 1794-IE8H Specifications Page 28

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Publication 1794-RM001F-EN-P - September 2011
3-6 FLEX I/O Modules
Users can also wire a standard digital output module in series with an isolated
relay output module in series with a critical actuator. In the event that a failure
is detected, the output from both output modules must be set to OFF to
guarantee the Output Loads de-energize. This is shown in Figure 3.6.
Figure 3.6 ControlLogix/FLEX I/O Standard Output Module Wiring With an Isolated
Relay Module
1 2 3 4 5 6 7 8 910 11121314150
24VDC SINK INPUT
1794-IB16
1 2 3 4 5 6 7 8 910 11121314150
24VDC SOURCE OUTPUT
1794-OB16
1 2 3 4 5 6 7 8 910 11121314150
24VDC SOURCE OUTPUT
1794-OB16
Isolated Relay
Output Module
43364
Standard Digital
Input Module
Standard Digital
Output Module
+24V
COM
Wire output point
to input point to
verify the correct
state of the output
Output
Output
Actuator
+24V
COM
Note 1: An external relay can be replaced with an isolated
relay module which is mounted in another FLEX I/O rail.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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