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1. Description
1.4. Front Panel Unit (FPU)
The Front Panel Unit (FPU) contains the necessary connectors, switches, logic, and LED
indicators for the Front Panel. For every type of Trusted I/O Module, the FPU contains the
Slice Healthy, Active/Standby, the Educated LED indicators, and the Module removal
switches. Additional bi-colour LEDs provide status indication for the individual I/O signals.
Serial data interfaces connect the FPU to each of the HIU slices to control the LED status
indicators and monitor the Module removal switches.
1.5. Line Monitoring and Output States
The Module automatically monitors the output channel current and voltage to determine
the state of the output channel. The numerical output state and line fault status are
reported back to the application and are represented below.
Description
Field Short Circuit
Output Energised (On)
No Load, Field Open Circuit
Output De-energised (Off)
No Field Supply Voltage
It is recommended to fit a dummy load resistor to unused outputs so that a current is drawn
that exceeds the NO-LOAD threshold. This will help prevent the Module from signaling a
NO-LOAD fault.
1.6. Housekeeping
The Output Module automatically performs local measurements of several on-board signals
that can be used for detailed troubleshooting and verification of Module operating
characteristics. Measurements are made within each slice's HIU and FIU.
1.7. Fault Detection/Testing
Extensive diagnostics provide the automatic detection of Module faults. The TMR
architecture of the Output Module and the diagnostics performed verify the validity of all
critical circuits. Using the TMR architecture provides a Fault Tolerant method to withstand
6
Trusted TMR 24Vdc Digital Output Module – 40 Channel
Output State
Table 1 Line Monitoring Fault Status
Issue 14
Numerical
Line Fault
Status
5
1
4
0
3
1
2
0
1
1
Rockwell Automation Publication ICSTT-RM280N-EN-P
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