What causes FANUC alarm 182?

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 182?

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 182. 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 182

Fanuc 182 - Illegal command in polar coordinate

Alarm 182 occurs when the CNC control detects an incompatible G-code command or movement while polar coordinate interpolation (G12.1/G13.1) is active. Certain commands like tool compensation (G41/G42), canned cycles, or multi-axis movements cannot be executed in polar coordinate mode and must be cancelled before use.

FANUCProgram/G-codeIntermediate5-30 minutes

182

Fanuc 182 - Illegal command in polar coordinate

ILLEGAL COMMAND IN POLAR COORDINATE

Root Cause Summary

Alarm 182 occurs when the CNC control detects an incompatible G-code command or movement while polar coordinate interpolation (G12.1/G13.1) is active. Certain commands like tool compensation (G41/G42), canned cycles, or multi-axis movements cannot be executed in polar coordinate mode and must be cancelled before use.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Review the program block immediately before the alarm. Check if G12.1 (polar coordinate ON) is active.
2
Search the program for G41 or G42 commands between G12.1 and G13.1. Cancel polar mode with G13.1 before activating tool compensation.
3
If compensation is needed, restructure program: cancel polar mode (G13.1), activate compensation (G41/G42), complete compensated moves, cancel compensation (G40), then re-enable polar mode (G12.1) if needed.
4
Test modified program in single block mode to verify proper sequencing of modal commands.
Always simulate or dry run after program changes to prevent crash conditions.

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