Rockwell Automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual - Manual (Page 108)

Publication 1794-UM061A-EN-P - July 2006
106 Interpret the Indicators
Diagnostic Functions for the 1794-IB16D
Ext.
Power
Wiring Input
Status
Channel LED
Status
Open Wire
Error Bit
Short
Error Bit
Rev.
Error Bit
Module Error
Bit/LED
OFF Open Off Off 0 0 0 0/OFF
On Off 0 0 0 0/OFF
Short Off Off 0 0 0 0/OFF
On Off 0 0 0 0/OFF
Normal Off Off 0 0 0 0/OFF
On Off 0 0 0 0/OFF
ON Open Off RED 1 0 0 1/RED
On RED/YEL 1 0 0 1/RED
Short Off RED 0 1 0 1/RED
On RED/YEL 0 1 0 1/RED
Normal Off Off 0 0 0 0/OFF
On YEL 0 0 0 0/OFF
REV Open Off Off 0 0 1 1/RED
On Off 0 0 1 1/RED
Short Off Off 0 0 1 1/RED
On Off 0 0 1 1/RED
Normal Off Off 0 0 1 1/RED
On Off 0 0 1 1/RED
The module monitors each sensor-power port for current and voltage. It turns on the channel red LED and sets (1) the error bit when
1) the module detects a short circuit (no voltage at the sensor-port), and 2) the module detects an open wire ( no current at the
sensor-port).