Rockwell Automation Publication ICSTT-RM406J-EN-P - February 2021 37
Chapter 4 About Troubleshooting
Figure 3 - Class of Fault and Status Indications
System Fault
The controller indicates a system fault when it detects an internal fault rather
than and external field fault. The controller can detect and report as a system
fault the following kinds of faults:
A module fault
A fault the controller cannot isolate to an individual module. For example, the
absence of every I/O module in a termination assembly group.
The System Healthy status indicator on each processor module will show red
to indicate a system fault.
Module Fault
The controller indicates a module fault when it detects a fault and can isolate it
to one of its module (processor or I/O module). The Healthy status indicator on
the faulty module will show red and the System Healthy status indicator on
each processor module will also show red.
Channel Fault
The controller indicates a channel fault when it detects a fault and can isolate it
to a fault on a channel of an I/O module. The controller always reports a
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