What causes FANUC alarm 288?

Part program contains an illegal G-code or M-code combination for this alarm type. Missing or incorrect address word in the program block. Axis or parameter value out of range for the commanded function. Required option not enabled on this CNC for the commanded function. Conflict between active modal states and the commanded function.

How do I fix FANUC alarm 288?

1. Note the block number shown on the alarm screen and locate that block in the program. 2. Review the command in that block against the Fanuc programming manual for alarm 288. 3. Check for missing address words, incorrect values, or conflicting G-code combinations. 4. Verify any required CNC options are enabled if using advanced functions. 5. Correct the program and verify the fix before restarting machining.

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FANUC Controller

Program/G-code · Intermediate · 5-30 minutes

Alarm 288

Fanuc 288 - Look ahead function not available

Alarm 288 occurs when the part program attempts to use advanced look-ahead functionality (AI Contour Control, AI Nano Contour, or high-speed machining features) that is either not licensed, not enabled via parameters, or not supported by the current control model. This is a software/licensing limitation rather than a hardware fault.

FANUCProgram/G-codeIntermediate5-30 minutes

288

Fanuc 288 - Look ahead function not available

LOOK AHEAD FUNCTION NOT AVAILABLE

Root Cause Summary

Alarm 288 occurs when the part program attempts to use advanced look-ahead functionality (AI Contour Control, AI Nano Contour, or high-speed machining features) that is either not licensed, not enabled via parameters, or not supported by the current control model. This is a software/licensing limitation rather than a hardware fault.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Check the part program for G05.1 Q1, G05.1 Q2, or G08 P1 commands that activate look-ahead functions.
2
Verify installed software options on the control: Press SYSTEM > PMC > Soft Key [OPTION]. Look for AI Contour Control, AI Nano Contour, or High-Speed Cycle Cutting options.
3
Check parameter 19500#0 (AI Contour Control) and 19500#1 (AI Nano Contour) to verify if features are enabled (should be 1).
Parameter changes require FANUC authorization and may require machine restart. Document original values before changes.
4
If option is not installed, either purchase the software upgrade from FANUC or modify the program to remove G05.1 Q1/Q2 commands and use standard G-code programming.

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