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Trusted TMR 120 Vac Digital Input Module 40 Channel
5. Fault Finding and Maintenance
5. Fault Finding and Maintenance
5.1. Fault Reporting
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 which 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.
5.2. Field Wiring Faults
The Trusted TMR 120 Vac Digital Input does not support line monitoring for open or shorted
field loops. These faults will be reported to the TMR Processor as a channel OFF state. Open
circuit faults between the T8824 and the Module are detected and reported.
5.3. Module Faults
Extensive diagnostics provide the automatic detection of Module faults. The TMR
architecture of the Input Module and the diagnostics performed verify 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 LEDs on the Front Panel of the Module and through the INFO and HKEEPING
variables. Under normal operations all three Healthy LEDs are green. When a fault occurs,
one of the Healthy LEDs will flash red. It is recommended that this condition is investigated,
and if the fault 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. Refer to
Operator and Maintenance Manual for Module Replacement Procedure.
5.4. Companion Slot
For a Companion Slot configuration, two adjacent slots in a Trusted Chassis are configured
for the same Input Module function. One slot is the primary slot and the other a unique
secondary (or spare) slot. The two slots are joined at the rear of the Trusted Chassis with a
double-wide I/O Interface Cable that connects both slots to common field wiring
terminations. During normal operations, the primary slot contains the Active Module as
Rockwell Automation Publication ICSTT-RM450C-EN-P
Issue 11
26
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