Introduction
A Common FANUC CNC Alarms List is a collection of error codes and messages that appear on FANUC CNC (Computer Numerical Control) machines when something goes wrong. These alarms help machine operators, programmers, and maintenance engineers identify and fix problems quickly.
FANUC CNC machines use hundreds of alarm codes, but certain errors are very common during daily machining operations. A “Common FANUC CNC Alarms List ” typically includes:
1. Basic Operation & Program Alarms Alarm Code Meaning 000 P/S Alarm General program structure error 001 P/S Illegal G-code 003 P/S Address missing (e.g., X, F, S missing) 004 P/S Zero-return incomplete 005 P/S No P or Q value in cycle 010 P/S Emergency stop is active 011 P/S Overtravel emergency 014 P/S Block delete signal ON 017 P/S Illegal command in manual mode 020 P/S Sequence number not found (N-number missing) 021 P/S Illegal address used 085 P/S RS-232 communication error
2. Overtravel (OT) Alarms Alarm Code Meaning 500 X-axis overtravel 501 Y-axis overtravel 502 Z-axis overtravel 503 4th axis overtravel 504 5th axis overtravel 505 6th axis overtravel 506 Soft limit reached
3. Servo Motor / Servo Drive Alarms Alarm Code Meaning 401 SERVO ALARM X servo error 402 Y servo error 403 Z servo error 404 Axis overload 410 SERVO Serial communication error with amplifier 414 Servo motor overload (common alarm) 417 Excessive position deviation 419 Pulse coder disconnected / failed 424 Servo amp overheating 430-439 Regenerative discharge error
4. Spindle Alarms Alarm Code Meaning 700 SPINDLE Spindle malfunction (general) 701 Spindle orientation failure 703 Spindle speed deviation too large 710 Spindle drive overcurrent 712 Spindle overheating 730-739 Spindle amplifier communication error 750 Spindle encoder failure
5. Battery & Memory Alarms Alarm Code Meaning 910 Absolute pulse coder battery low 911 Absolute pulse coder battery dead 912 Memory backup battery low 913 RAM memory lost 920 Servo parameters lost
6. I/O (Input / Output) Alarms Alarm Code Meaning 0100 I/O Door switch open / safety circuit open 0101 ATC (tool changer) not ready 0102 Pallet not clamped 0300 M-code interface error 0310 No signal from PLC 0320 Solenoid valve not active 0400 Lubrication alarm
7. Tool & ATC Related Alarms Alarm Code Meaning 1000 Tool changer malfunction 1001 Tool not detected 1003 Tool magazine overload 1010 Tool unclamp failed 1020 Arm rotation error
8. Parameter / Setting Alarms Alarm Code Meaning PS084 Parameter write protected PS085 Incorrect parameter value PS086 System parameter not set PS100 Format error in parameter PS136 Grid shift setting missing
9. Overheat / Electrical Alarms Alarm Code Meaning OH-01 Servo amplifier overheating OH-02 Spindle amp overheating OH-03 Control cabinet overheat FU-01 Fuse blown P/S 5000 Power supply voltage abnormal
10. PMC / Ladder Related Alarms Alarm Code Meaning EX100 External emergency EX102 Air pressure low EX103 Hydraulic pressure low EX104 Lubrication pressure low EX105 Coolant level low
