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78 Series 90-70 Hot Standby CPU Redundancy User’s Guide – December 1993
GFK-0827
Table 10. Maskable Fault Group Actions
Fault Action
Fault Group
Simplex Mode Redundant Mode
User Configurable
LOSS_RACK Non-Fatal Fatal Yes
LOSS_IOC Non-Fatal Fatal Yes
LOSS_IO_MOD Non-Fatal Non-Fatal Yes
LOSS_OTHR_MOD Non-Fatal Non-Fatal Yes
ADD_RCK Non-Fatal Non-Fatal No
ADD_IOC Non-Fatal Non-Fatal No
ADD_IO_MOD Non-Fatal Non-Fatal No
ADD_OTHR_MOD Non-Fatal Non-Fatal No
IOC_FAULT Non-Fatal Conditionally Fatal Yes
IO_MOD_FAULT Non-Fatal Non-Fatal No
CNFG_MIS_MTCH Fatal Fatal Yes
SYS_BUS_ERROR Fatal Fatal No
CPU_HARDWR Fatal Fatal No
MOD_HARDWR Non-Fatal Non-Fatal No
IOC_SOFTWR Fatal Conditionally fatal No
MOD_OTHR SOFTWR Non-Fatal Non-Fatal No
PRG_BLK_CHKSUM Fatal Fatal No
LOW_BATTERY Non-Fatal Non-Fatal No
CNST_SW_EXCD Non-Fatal Non-Fatal No
PLC_FTBL_FULL Non-Fatal Non-Fatal No
IO_FTBL_FULL Non-Fatal Non-Fatal No
APPLICATION_FLT Non-Fatal Non-Fatal No
The two fault groups IOC_FAULT and IOC_SOFTWR faults are Conditionally Fatal to
the system (forces the PLC to STOP FAULT mode) whenever the fault that is logged is
Fatal to the Genius Bus Controller that logged the fault. When a module logs a fault it
notifies the PLC whether or not it can continue by placing Fatal or Diagnostic in the fault
action of the fault entry. The PLC will shut the Genius Bus Controller down on all Fatal
faults.
Note
In a CPU redundancy system a Fatal fault from a GBC will cause the
active unit to transition to STOP FAULT mode. All Diagnostic faults will
allow the CPU to continue to operate.