What causes FANUC alarm 192?

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 192?

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 192. 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 192

Fanuc 192 - Cannot command in helical interpolation

Alarm 192 occurs when the CNC detects an improperly formatted helical interpolation command (G02/G03 with I, J, K and a Z or additional axis move). Common causes include commanding multiple axes beyond the circular plane, missing or conflicting arc parameters, or attempting to use unsupported commands within a helical move block.

FANUCProgram/G-codeIntermediate5-30 minutes

192

Fanuc 192 - Cannot command in helical interpolation

CANNOT COMMAND IN HELICAL INTERPOLATION

Root Cause Summary

Alarm 192 occurs when the CNC detects an improperly formatted helical interpolation command (G02/G03 with I, J, K and a Z or additional axis move). Common causes include commanding multiple axes beyond the circular plane, missing or conflicting arc parameters, or attempting to use unsupported commands within a helical move block.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Locate the alarm line number in the program and examine the G02 or G03 block for all axis commands present.
2
Verify only three axes are commanded: two for the circular arc (e.g., X and Y with I and J) and one for helical motion (e.g., Z).
3
Check that the plane selection (G17/G18/G19) matches the I, J, or K arc center designations used in the block.
4
Remove any extra axis commands or split the move into separate blocks if multiple non-planar movements are required.

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