Rockwell Automation Allen-Bradley 1794-IB16D - Diagnostic Functions for 1794-IB16 D

108 Rockwell Automation Publication 1794-UM061B-EN-P - March 2020
Appendix A Interpret the Indicators
Diagnostic Functions for the 1794-IB16D
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
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 1001/RED
On
RED/YEL 1001/RED
Short Off
RED 0 10 1/RED
On
RED/YEL 0 10 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).