Rockwell Automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual - Manual (Page 23)

Publication 1794-UM061A-EN-P - July 2006
About the FLEX I/O Diagnostic Input Module 21
Diagnostic Fault Detection
The module monitors current and voltage at each input channel sensor power
terminal, and monitors the user supply for reverse user supply voltage. The
figure below shows the location of these fault monitors in the 1794-IB16D
diagnostic input module.
.
.
User Power
Reverse
Voltage
Monitor
PTC
Shorted
Input
Monitor
Open Wire
Monitor
Input Circuit Indicator
+
-
Input
Sensor Power
Reverse
Short
Open
Input
Flex
bu
s In
terf
ace
V+
Fault Indicator