Allen-Bradley Flex I/O - Diagnostics; Diagnostic Functions for the 1794-IB16 D

12 FLEX I/O Digital Input and Output Modules w/ Diagnostics
Publication 1794-IN096C-EN-P - August 2015
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.
Power
Wiring Input
Status
Channe
l 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 1001/RED
On
RED/YEL 1001/RED
Short Off
RED 0 101/RED
On
RED/YEL 0 101/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).