815-578-9145System 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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| 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. |