Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 28)

28 Rockwell Automation Publication 1791DS-UM001J-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. 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 13 - Short-circuit Between Input Signal Lines
External Contact
Short-circuit Between Input Signal Lines and Power
Supply (positive side)
External Contact
Short-circuit Between Input Signal Lines
44079
24V
V
G
T0
IN0
T1
IN1
24V
0V