Rockwell Automation 1791ES-IB16 Guard I/O EtherNet/IP Safety Modules - Manual (Page 20)

20 Rockwell Automation Publication 1791ES-UM001D-EN-P - May 2013
Chapter 2 Understand the Operation of Safety Functions
When the external input contact is closed, a test pulse is output from the test
output terminal to diagnose the field wiring and input circuitry. By using this
function, short-circuits between input signal lines and the power supply (positive
side), and short-circuits between input signal lines can be detected.
Figure 6 - Short-circuit Between Input Signal Lines
T0
IN0
24V
0V
24V
T1
IN1
IN+
IN-
External
Short-circuit Between Input Signal Lines and Power
Supply (Positive Side)
External Contact
Short-circuit Between Input Signal Lines
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