What causes FANUC alarm 110?

Part program contains an illegal or malformed command related to the alarm condition. Missing required address word or parameter value in the program block. Programmed value is out of the allowable range. Conflict between active modal codes and the commanded function. Post-processor configuration mismatch for this Fanuc series.

How do I fix FANUC alarm 110?

1. Note the block number shown in the alarm screen and locate that block in the program. 2. Review the command in that block against the Fanuc programming manual. 3. Check for missing words, incorrect values, or conflicting G-code combinations. 4. Verify the program is post-processed for the correct Fanuc series. 5. Correct the program and dry-run at low speed before resuming machining.

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FANUC Controller

Program/G-code · Basic · 10-20 minutes

Alarm 110

Fanuc Alarm 110 - Invalid ISO Code

Alarm 110 occurs when the CNC detects an unrecognized or improperly formatted ISO code (G-code, M-code, or address character) in the NC program. This typically results from unsupported codes for the specific control model, typographical errors, or incorrect formatting such as missing spaces or invalid address combinations.

FANUCProgram/G-codeBasic10-20 minutes

110

Fanuc Alarm 110 - Invalid ISO Code

ISO Code Error

Root Cause Summary

Alarm 110 occurs when the CNC detects an unrecognized or improperly formatted ISO code (G-code, M-code, or address character) in the NC program. This typically results from unsupported codes for the specific control model, typographical errors, or incorrect formatting such as missing spaces or invalid address combinations.

Safety

Program not readable

Causes and Fixes

1
Identify the exact line number causing the alarm from the CNC screen display. Note the G-code, M-code, or address character shown in the alarm message.
2
Cross-reference the code against the Programming Manual for your specific Fanuc series. Navigate to SYSTEM > PARAM and check parameter 3204 (G-code system selection A/B/C) to verify which code set is active.
3
Check parameters 3290-3295 (valid G-code range) and parameters 3210-3213 (M-code restrictions) to confirm the code is within acceptable ranges for your configuration.
4
If the code is valid but not enabled, verify software options in SYSTEM > PARAM > option list or contact your distributor. If invalid, edit the program to use supported codes or remove the offending line.
Changing parameter 3204 will alter G-code behavior system-wide; backup parameters before modification.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter corruption suspected
·Repeated alarms after program corrections
·Machine coordinate system issues

Prevention

Validate macro calculations before execution
Use parameter limits checking
Implement program verification routines
Regular parameter backup

Common Mistakes

Ignoring integer overflow in macros
Not checking coordinate system offsets
Modifying parameters without documentation
Using incorrect decimal point format

Related Alarms

111 136 020 501

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