18 Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016
Chapter 1 Safety Function Operation
occur before the discrepancy time elapses, the channels fault. In the fault state,
the input and status for both channels are set low (off ). When configured as an
equivalent dual pair, the data bits for both channels are sent to the controller as
equivalent, both high or both low.
Figure 6 - Equivalent, Normal Operation, and Fault Detection (not to scale)
ON
OFF
IN0
Safety Input 0
IN1
Fault Detected
Discrepancy Time
Remote
I/O
Data
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
IN0
Safety Input
Status 0, 1
IN1
Fault Detection
Remote
I/O
Data
ON
OFF
ON
OFF
ON
OFF
Discrepancy Time
Safety Input
Status 0, 1
Safety Input 1
Safety Input 1
Safety Input 0
Normal Operation
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