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Fault reporting
Field wiring faults
Module faults
Fault finding and maintenance
Input Module faults are reported to the user through visual indicators (LEDs)
on the Front Panel of the Module. Faults are also reported via status variables
that may be automatically monitored in the application programs, and
external system communications interfaces. There are generally two types of
faults that must be remedied by the user; external wiring and module faults.
External wiring faults require corrective action in the field to repair the fault
condition. Module faults require replacement of the Input Module.
The input circuits of the Module may be used to detect field wiring faults in
addition to alarm states. To achieve this, line monitoring components must
be fitted to the field device.
By comparing the input signal from the field with pre-configured alarm
thresholds, the Module can automatically detect field wiring faults. When a
field loop develops a line fault, the input channel status LED will adopt the
steady red state (default setting). The corresponding input state will be
reported and the line fault status for that channel will be set to '1'. All other
input channels will be unaffected, except in the case of common cause wiring
faults in the field.
Once the field wiring fault has been identified and corrected, the input status
and the input status LED will display the normal status of the field device and
field wiring.
Extensive diagnostics provide the automatic detection of module faults. The
TMR architecture of the Input Module and the diagnostics performed ensure
the validity of all critical circuits. Using the TMR architecture provides a Fault
Tolerant method to withstand the first fault occurrence on the Module and
continue normal input measurements without interruption in the system or
process. Faults are reported to the user through the Healthy status indicators
on the Front Panel of the Module and through the INFO and HKEEPING
variables. Under normal operations all three Healthy Indicators are green.
When a fault occurs, one of the Healthy Indicators will be flashing red. It is
recommended that this condition is investigated and if the cause is within the
Module, it should be replaced.
Module replacement activities depend on the type of spare module
configuration chosen when the system was configured and installed. The
Module may be configured with a dedicated Companion Slot or with a
SmartSlot for a spare replacement module.
Rockwell Automation Publication ICSTT-RM273Q-EN-P - August 2021
Chapter 6
33
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