Diagnostics - Allen-Bradley 1794-IB16D Installation Instructions Manual

FLEX I/O Digital Input and Output Modules with Diagnostics

Diagnostics

See configuration information below for location of diagnostic bits.
Note: Each unused sensor port requires a dummy resistor to mask the channel diagnostic
function.
Diagnostic Functions for the 1794-IB16D
Ext. Wiring
Power
OFF Open
Short
Normal
ON Open
Short
Normal
REV Open
Short
Normal
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).
Input Channel
Status LED
Status
Off Off
On Off
Off Off
On Off
Off Off
On Off
Off RED
On RED/YEL
Off RED
On RED/YEL
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
1 0
0 1
0 1
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
Publication 1794-IN096D-EN-P - June 2018
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 1/RED
0 1/RED
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
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