System Alarm Codes

FANUC System Alarm Codes List

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
Alarm	Message	Description
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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