36 Rockwell Automation Publication ICSTT-RM406J-EN-P - February 2021
Chapter 4 About Troubleshooting
• Check: the module PST value is it set to the correct value or if it has been
left at zero.
• Check: the communication link between the processor module and the I/
O module (possible I/O base unit fault or loose bus cable)
Fault Indications The diagnostic systems detects these classes of fault:
• System fault: a faulty AADvance system.
• Module fault: a faulty single module.
• Channel fault: faulty circuits inside an I/O module or in a TA serving a
channel.
• Field fault: faulty field loop wiring outside the I/O module and TA serving
a channel.
The diagnostic systems uses the module status indicators to show the presence
of a fault. The indicators show the location and where possible the type of fault,
and give the information you need to find the problem. The following groups
of status indicators can show faults:
• The System Healthy status indicator on each processor module
• The Healthy status indicator on each processor and I/O module
• The Channel status indicator on each I/O module
• A channel fault produces a module fault indication and a system fault
indication, similarly a module fault will also produce a system fault.
The relationships between the classes of faults and the status indicators are
shown in the illustration.
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