Allen-Bradley 1734-OB8S - Single Channel Mode

Rockwell Automation Publication 1734-UM013C-EN-P - August 2010 23
Safety Functions Chapter 2
Single Channel Mode
If an error is detected, safety input data and safety input status turn off.
Figure 7 - Normal Operation and Fault Detection (not to scale)
24V
0V
Test Output 0
Input Terminal 0
External Device
Fault
Detected
ON
OFF
ON
OFF
ON
OFF
ON
OFF
24V
0V
ON
OFF
Safety Input
Status 0
Fault Detection
ON
OFF
ON
OFF
ON
OFF
Safety Input
Status 0
Safety Input 0
Safety Input 0
Input Terminal 0
Normal
Operation
External Device
Test Output 0
Safety
I/O
Network
Data Sent
to the
Controller
Safety
I/O
Network
Data Sent
to the
Controller