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Rockwell Automation Publication 1734-UM013C-EN-P - August 2010
Chapter 2
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 inputs and 24V power, and between input signal
lines and open circuits can be detected.
Figure 6 - Short-circuit Between Input Signal Lines
IN+
24
V
24
V
0
V
COM
T0
T1
IN0
IN1
External Contact
Short-circuit Between Input Signal Lines and
Power Supply (positive side)
External Contact
Short-circuit Between Input Signal Lines
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