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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 of 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 amplifier 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 amplifier 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.

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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