Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 32)

32 Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013
Chapter 2 Understand the Operation of Safety Functions
complementary dual-channel pair, the data bits for both channels will always be
sent to the controller in complementary, or opposite states.
Figure 16 - 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