815-578-9145FANUC System Alarm Codes List
Understanding Fanuc Alarms
Fanuc Alarms serve as warning signals that alert operators to the presence of a problem in the system. When an alarm goes off, it displays a specific code that indicates the cause of the issue.
Common Fanuc Alarms and Their Meanings
There are several Fanuc Alarms that an operator may encounter, and each code has a specific meaning. 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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| Alarm | Message | Description |
|---|---|---|
| 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. |
|
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. |
|
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 parameters and other data again. |
|
|
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. |
|
|
PMC WATCH DOG ALARM |
An error occurred in the PMC. (Watchdog alarm) The motherboard may be faulty. |
|
|
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. |
|
|
NMI OCCURRED IN SLC |
With the PMC–SA1, an I/O Link disconnection was detected. Check the I/O Link. |
|
|
NMI OCCURRED IN OTHER MODULE |
An NMI occurred on a board other than the motherboard. The option board may be faulty. |
|
|
NON MASK INTERRUPT |
An NMI occurred as a result of an unknown cause. |
|
|
F–BUS ERROR |
A bus error occurred on the FANUC bus. The motherboard or option board may be faulty. |
|
|
BUS ERROR |
A bus error occurred on the motherboard. The motherboard may be faulty. |
|
|
L–BUS ERROR |
A bus error occurred on the local bus. The motherboard may be faulty. |
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Troubleshooting Fanuc Alarms
When a Fanuc Alarm goes off, operators should take these steps to troubleshoot the problem as soon as possible:
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Check the Alarm Code: The first step in troubleshooting any Fanuc Alarm is to check the code. This will provide valuable insight into the cause of the issue.
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Refer to the Fanuc Manual: The Fanuc Manual is an excellent resource for troubleshooting any issues that may arise in the system. It provides detailed information on each alarm code and how to resolve it.
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Check the Machine: Operators should also check the machine for any visible signs of damage or wear and tear. This could include loose wires, damaged components, or other issues.
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