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3-8 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
3
Fault Actions
Fatal faults cause the PLC to enter a form of STOP mode at the end of the sweep in which the
error occurred. Diagnostic faults are logged and corresponding fault contacts are set.
Informational faults are simply logged in the PLC fault table.
Loss of, or Missing, Option Module
The Fault Group Loss of, or Missing Option Module occurs when a PCM, CMM, or ADC fails to
respond. The failure may occur at power-up if the module is missing or during operation if the
module fails to respond. The fault action for this group is Diagnostic.
Error Code:
1, 42
Name:
Option Module Soft Reset Failed
Description:
PLC CPU unable to re-establish communications with option module after soft
reset.
Correction:
(1) Try soft reset a second time.
(2) Replace the option module.
(3) Power off the system. Verify that the PCM is seated properly in the
rack and that all cables are properly connected and seated.
(4) Replace the cables.
Error Code:
79
Name:
Loss of Daughterboard
Description:
The daughterboard has been lost (i.e., not seen by the CPU) and will not function.
Correction:
Make sure the CPU has a daughterboard physically present.
Error Code:
All Others
Name:
Module Failure During Configuration
Description:
The PLC operating software generates this error when a module fails
during power-up or configuration store.
Correction:
Power off the system. Replace the module located in that rack and slot.