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System Alarm Codes

FANUC System Alarm Codes List

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Faulty components or motherboard errors throw system alarms and put your machinery at a standstill. Consult the list below for common “900” FANUC system codes to get an idea for what’s causing your problem.

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FANUC System Alarm Codes

AlarmMessageDescription
900 ROM PARITY A parity error occurred in the CNC, macro, or servo ROM. Correct
the contents of the flash ROM having the displayed number.
910 SRAM PARITY : (BYTE 0) A RAM parity error occurred in the part program storage RAM. Clear
the RAM, or replace the SRAM module or motherboard. Subsequently,
re–set the parameters and all other data.
911 SRAM PARITY : (BYTE 1)
912 DRAM PARITY : (BYTE 0) A RAM parity error occurred in the DRAM module. Replace the DRAM module.
913 DRAM PARITY : (BYTE 1)
914 DRAM PARITY : (BYTE 2)
915 DRAM PARITY : (BYTE 3)
916 DRAM PARITY : (BYTE 4)
917 DRAM PARITY : (BYTE 5)
918 DRAM PARITY : (BYTE 6)
919 DRAM PARITY : (BYTE 7)
920 SERVO ALARM (1–4 AXIS) Servo alarm (first to fourth axis). A watchdog alarm condition occurred,
or a RAM parity error occurred in the axis control card.
Replace the axis control card.
921 SERVO ALARM (5–8 AXIS) Servo alarm (fifth to eighth axis). A watchdog alarm condition occurred,
or a RAM parity error occurred in the axis control card.
Replace the axis control card.
926 FSSB ALARM FSSB alarm. Replace the axis control card.
930 CPU INTERRUPT CPU error (abnormal interrupt).
The motherboard or CPU card may be faulty.
935 SRAM ECC ERROR An error occurred in RAM for part program storage.
Action:
Replace the master printed circuit board (SRAM module), perform
all–clear operation, and set all parameter and other data again.
950 PMC SYSTEM ALARM
PCxxx YYYYYYYYYYYYYY
An error occurred in the PMC.
For details of PCxxx, see the list of system alarm messages in Section
A.2, ”LIST OF ALARMS (PMC)” in this manual.
951 PMC WATCH DOG ALARM An error occurred in the PMC.
(Watchdog alarm)
The motherboard may be faulty.
970 NMI OCCURRED IN PMCLSI With the PMC–SA1, an error occurred in the PMC control LSI device
on the motherboard. (I/O RAM parity)
Replace the motherboard.
971 NMI OCCURRED IN SLC With the PMC–SA1, an I/O Link disconnection was detected.
Check the I/O Link.
972 NMI OCCURRED IN OTHER MODULE An NMI occurred on a board other than the motherboard.
The option board may be faulty.
973 NON MASK INTERRUPT An NMI occurred as a result of an unknown cause.
974 F–BUS ERROR A bus error occurred on the FANUC bus.
The motherboard or option board may be faulty.
975 BUS ERROR A bus error occurred on the motherboard.
The motherboard may be faulty.
976 L–BUS ERROR A bus error occurred on the local bus.
The motherboard may be faulty.


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