Rockwell Automation 1791ES-IB16 Guard I/O EtherNet/IP Safety Modules - Manual (Page 25)

Rockwell Automation Publication 1791ES-UM001D-EN-P - May 2013 25
Understand the Operation of Safety Functions Chapter 2
both channel status bits are set low. When configured as a complementary dual
channel pair, the data bits for both channels will always be sent to the controller
in complementary, or opposite states.
Figure 9 - Complementary, 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