Chapter 9. Diagnostics
GFK-2950C February 2018 419
9.4.24 CPU System Software Failure (Group 135)
Faults in this group are generated by the operating software of the CPU. They occur at many
different points of system operation. When a fatal fault occurs, the CPU immediately transitions to
STOP/Halt. The only activity permitted when the CPU is in this mode is communications with the
programmer. The only method of clearing this condition is to cycle power on the controller with the
battery disconnected.
Action: Non-configurable.
5A hex/90 decimal, User Shut Down Requested
The CPU generates this informational alarm when SVC_REQ #13 (User Shut Down) executes in the
application program.
Correction
None required. Information-only alarm.
94 hex/148 decimal, Units Contain Mismatched Firmware, Update Recommended
This fault is logged each time the redundancy state changes and the redundant CPUs contain
incompatible firmware.
Correction
Ensure that redundant CPUs have compatible firmware.
D8 hex/216 decimal, Processor Exception Trap
The processor has detected an error condition while executing an instruction. The CPU was placed
into STOP/Halt mode.
Correction
Disconnect the battery from the CPU and cycle power to clear the STOP/Halt condition.
DA hex/218 decimal, Critical Over-Temperature Failure
Critical operating temperature of CPU exceeded.
Correction
Turn off CPU to allow heat to disperse and install a fan kit to regulate temperature.
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