Allen-Bradley 1732ES-IB12XOB4, User Manual, Page: 15 / 176

Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016 15
Safety Function Operation Chapter 1
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 4 - Short Circuit Between Input Signal Lines
T0
IN0
24V
0V
24V
T1
IN1
IN+
IN-
External Contact
Short Circuit Between Input Signal Lines and Power
Supply (positive side)
External Contact
Short Circuit Between Input Signal Lines