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GFK-1527A Chapter 5 Fault Detection 5-9
5
Non-Configurable Fault Group
The table below shows the non-configurable faults and their fault action defaults.
Fault Actions
Fault Group
Table
Type
Description
Not Synchronized Synchronized
SYS_BUS_FAIL PLC System bus failure. Fatal Fatal
NO_USER_PRG PLC No User's Program on Power-up. Non-Fatal Non-Fatal
BAD_USER_RAM PLC Corrupted User RAM detected on
Power-up.
Fatal Fatal
WIND_CMPL_FAIL PLC Window Completion Failure in
Constant Sweep Mode (i.e., all windows
failed to receive their allotted time).
Non-Fatal Non-Fatal
PASSWD_FAIL PLC Password Access Failure. Non-Fatal Non-Fatal
NULL_SYS_CNFG PLC NULL System Configuration for RUN
Mode.
Non-Fatal Non-Fatal
CPU_SOFTWR PLC PLC CPU Software Failure. Fatal Fatal
TOO_MANY_IOCS PLC
More than the allowable number of I/O
Bus Controllers were found in the
system.
Fatal Fatal
SEQ_STORE_FAIL PLC
Communication
failure during a store
operation by the programmer. This
fault results when the start-of-store
sequence was received but not an end-
of-store sequence.
Fatal Fatal
ADD_RCK PLC Addition of Extra Rack Non-Fatal Non-Fatal
ADD_IOC I/O Addition of or Extra IOC Non-Fatal Non-Fatal
ADD_IO_MOD I/O Addition of or Extra I/O Module Non-Fatal Non-Fatal
ADD_OTHR_MOD PLC Addition of, Reset of, or Extra Option
Module
Non-Fatal Non-Fatal
IO_MOD_FAULT I/O I/O Module Fault Non-Fatal Non-Fatal
CPU_HARDWR PLC CPU Hardware Failure Fatal Fatal
MOD_HARDWR PLC Module Hardware Failure (for example,
Serial Port Failure on PCM
Non-Fatal Non-Fatal
MOD_OTHR SOFTWR PLC Option Module Software Failure Non-Fatal Non-Fatal
PRG_BLK_CHKSUM PLC Program Block Checksum Mismatch Fatal Fatal
LOW_BATTERY PLC Low Battery in the System Non-Fatal Non-Fatal
CNST_SW_EXCD PLC Constant Sweep Exceeded Non-Fatal Non-Fatal
PLC_FTBL_FULL PLC PLC System Fault Table Full Non-Fatal Non-Fatal
IO_FTBL_FULL PLC I/O Fault Table Full Non-Fatal Non-Fatal
APPLICATION_FLT PLC User Application Fault Non-Fatal Non-Fatal
Fatal Faults on Both Units in the Same Sweep
It is very unlikely that a fatal fault would occur on both units in the same sweep. If that should
happen, however, the CPU will consult the synchronized fault action table for one unit and the not-
synchronized fault action table for the other. That will allow one of the units to stay in Run mode
when the synchronized fault action is Fatal and the not-synchronized fault action is Non-Fatal.