Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 165
Chapter 9
Troubleshoot Your Module
ControlLogix® analog I/O module have status indicators on the front of the
module that are used to monitor module operation.
Status Indicators for the
1756-IF8I Module
Topic Page
Status Indicators for the 1756-IF8I Module 165
Status Indicators for the 1756-IRT8I Module 166
Status Indicators for the 1756-IR12 Module 166
Status Indicators for the 1756-IT16 Module 167
Status Indicators for the 1756-OF8I Module 167
Use Logix Designer Application for Troubleshooting 168
Troubleshoot Incorrect Readings on the Module 170
Indicator Status Description
OK Steady green The module is in a normal operating state in Run mode.
Flashing green The module passed internal diagnostics and is not actively controlled or
the connection is open and the controller is in Program mode.
Flashing red Previously established communication has timed out.
Steady red Replace the module.
ST Steady yellow The channel is operating as expected.
Flashing yellow The channel is being calibrated.
Off The channel is not in use or is faulted.
FLT Off The channel is operating as expected or it is not in use.
Steady red • The channel is faulted. Possible causes of the fault include:
– Underrange/overrange detection
– Sourcing Over Current
– CRC from ADC always Bad
– Wire off detection
For more information on these causes see Chapter 3, 1756-IF8I Isolated
Analog Input Module on page 41
Flashing red The channel is faulted and is being calibrated. See the previous row for
more information about faults.
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