Publication 1794-In096D-En-P - June - Allen-Bradley 1794-IB16D Installation Instructions Manual

12 FLEX I/O Digital Input and Output Modules with Diagnostics
Diagnostic Functions for the 1794-OB16D
Ext. Wiring
Power
OFF Open
Short
Normal
ON Open
Short
Normal
REV Open
Short
Normal
The module monitors each output channel. It turns on the channel red LED and sets (1) the error bit when
1) the module detects a short circuit (the output signal is active at a channel and the corresponding output
voltage is low), and 2) the module detects an open wire (the output signal is inactive at a channel and the
corresponding output voltage is high).

Publication 1794-IN096D-EN-P - June 2018

Input Channel
Status LED
Status
Off Off
On Off
Off Off
On Off
Off Off
On Off
Off RED
On YEL
Off Off
On RED
Off Off
On YEL
Off Off
On Off
Off Off
On Off
Off Off
On Off
Open Short
Wire Error Bit
Error Bit
0 0
0 0
0 0
0 0
0 0
0 0
1 0
0 0
0 0
0 1
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
Rev. Module
Error Bit Error
Bit/LED
0 0/OFF
0 0/OFF
0 0/OFF
0 0/OFF
0 0/OFF
0 0/OFF
0 1/RED
0 0/OFF
0 0/OFF
0 1/RED
0 0/OFF
0 0/OFF
1 1/RED
1 1/RED
1 1/RED
1 1/RED
1 1/RED
1 1/RED