What causes FANUC alarm 185?

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 185?

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 185. 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 185

Fanuc 185 - Cannot command in cylindrical interpolation

Alarm 185 occurs when the CNC detects an incompatible G-code command or motion axis while cylindrical interpolation mode (G07.1) is active. Certain operations like canned cycles, tool radius compensation, or commanding restricted axes cannot be executed during cylindrical interpolation and will trigger this alarm.

FANUCProgram/G-codeIntermediate5-30 minutes

185

Fanuc 185 - Cannot command in cylindrical interpolation

CANNOT COMMAND IN CYLINDRICAL INTERPOLATION

Root Cause Summary

Alarm 185 occurs when the CNC detects an incompatible G-code command or motion axis while cylindrical interpolation mode (G07.1) is active. Certain operations like canned cycles, tool radius compensation, or commanding restricted axes cannot be executed during cylindrical interpolation and will trigger this alarm.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Review the program block that triggered the alarm and identify all active G-codes. Check parameter display or program stop position on the control screen.
2
Verify if G07.1 cylindrical interpolation mode is active. Check modal G-code display on the CNC screen to confirm active modes.
3
Remove or relocate prohibited commands (canned cycles, G41/G42, G15/G16, or helical interpolation) to program sections outside the G07.1 active block.
Ensure G07.1 is properly canceled with G07.1 C0 before using incompatible commands
4
If canned cycles are required, cancel cylindrical mode with G07.1 C0, execute the canned cycle, then re-enable G07.1 with proper axis assignment if needed.

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