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79GFK-0827 Chapter 4 Operation
Table 11. Non-Maskable Fault Group Descriptions
Fault Group
Table
Type Description
SYS_BUS_FAIL CPU System bus failure.
NO_USER_PRG CPU No User’s Program on Power-up.
BAD_USER_RAM CPU Corrupted User RAM detected on Power-up.
WIND_CMPL_FAIL CPU Window Completion Failure in Constant Sweep Mode (i.e., all
windows failed to receive their allotted time).
PASSWD_FAIL CPU Password Access Failure.
NULL_SYS_CNFG CPU NULL System Configuration for RUN Mode.
CPU_SOFTWR CPU PLC CPU Software Failure.
TOO_MANY_IOCS CPU More than the allowable number of I/O Bus Controllers were
found in the system.
SEQ_STORE_FAIL CPU Communication failure during a store operation by the program-
mer. This fault results when the start-of-store sequence was
received but not an end-of-store sequence.
Table 12. Non-Maskable Fault Action Descriptions
Fault Actions
Fault Group Simplex Mode Redundant Mode
SYS_BUS_FAIL Fatal Fatal
NO_USER_PRG Non-Fatal Non-Fatal
BAD_USER_RAM Fatal Fatal
WIND_CMPL_FAIL Non-Fatal Non-Fatal
PASSWD_FAIL Non-Fatal Non-Fatal
NULL_SYS_CNFG Non-Fatal Non-Fatal
CPU_SOFTWR Fatal Fatal
TOO_MANY_IOCS Fatal Fatal
SEQ_STORE_FAIL Fatal
fatal