Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 167
Troubleshoot Your Module Chapter 9
Status Indicators for the
1756-IT16 Module
Status Indicators for the
1756-OF8I Module
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. Some possible causes of the fault include:
– Underrange/overrange detection
– Wire off detection
– CRC from ADC always Bad
For more information on these causes see Chapter 4, Te mper atur e- se nsin g
Analog Modules on page 59
Flashing red The channel is faulted and is being calibrated. See the previous row for
more information about faults.
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. Some possible causes of the fault include:
– Triggered clamp alarm
– Wire off detection
– Output Data received was NotANumber
– DAC error
– CRC writing to DAC bad for last 10 attempts
– Value written to DAC does not match value read from DAC (checked
once a second)
For more information on these causes see Chapter 5, 1756-OF8I Isolated
Analog Output Module on page 89
Flashing red The channel is faulted and is being calibrated. See the previous row for
more information about faults.
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