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3-14 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
3
PLC CPU System Software Failure
Faults in the Fault Group PLC CPU System Software Failure are generated by the operating software
of the Series 90-30, 90-20 or Micro PLC CPU. They occur at many different points of system operation.
When a Fatal fault occurs, the PLC CPU immediately transitions into a special ERROR SWEEP
mode. No activity is permitted when the PLC is in this mode. The only way to clear this condition is to
cycle power on the PLC. The fault action for this group is Fatal.
Error Code:
1 through B
Name:
User Memory Could Not Be Allocated
Description:
The PLC operating software (memory manager) generates these errors when
software requests the memory manager to allocate or deallocate a block or blocks
of memory from user RAM that are not legal. These errors should not occur in a
production system.
Correction:
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
Error Code:
D
Name:
System Memory Unavailable
Description:
The PLC operating software (I/O Scanner) generates this error when its request
for a block of system memory is denied by the memory manager because no
memory is available from the system memory heap. It is Informational if the error
occurs during the execution of a DO I/O function block. It is Fatal if it occurs
during power-up initialization or autoconfiguration.
Correction:
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
Error Code:
E
Name:
System Memory Could Not Be Freed
Description:
The PLC operating software (I/O Scanner) generates this error when it requests
the memory manager to deallocate a block of system memory
and the deallocation fails. This error can only occur during the execution
of a DO I/O function block.
Correction:
(1) Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
(2) Perform the corrections for corrupted memory.
Error Code:
10
Name:
Invalid Scan Request of the I/O Scanner
Description:
The PLC operating software (I/O Scanner) generates this error when the operating
system or DO I/O function block scan requests neither a full nor a partial scan of
the I/O. This should not occur in a production system.
Correction:
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
Error Code:
13
Name:
PLC Operating Software Error
Description:
The PLC operating software generates this error when certain PLC
operating software problems occur. This error should not occur in a
production system.
Correction:
(1) Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
(2) Perform the corrections for corrupted memory.