axismd.ai
FANUC Controller
Program/G-code · Intermediate · 5-30 minutes
Fanuc 371 - Illegal command in coordinate rotation
Alarm 371 occurs when the control detects an incompatible or illegal G-code command while coordinate rotation (G68) is active. Certain commands such as canned cycles, tool radius compensation in specific modes, or plane changes cannot be executed during coordinate rotation and will trigger this alarm.
371
Fanuc 371 - Illegal command in coordinate rotation
ILLEGAL COMMAND IN COORDINATE ROTATION
Fanuc PS program alarm 371: ILLEGAL COMMAND IN COORDINATE ROTATION. This alarm is triggered by an illegal or incorrectly formatted command in the part program, or a programming condition that the Fanuc control cannot execute.
Root Cause Summary
Alarm 371 occurs when the control detects an incompatible or illegal G-code command while coordinate rotation (G68) is active. Certain commands such as canned cycles, tool radius compensation in specific modes, or plane changes cannot be executed during coordinate rotation and will trigger this alarm.
Safety
- Verify corrected program or parameters before resuming machining
Causes and Fixes
- 1
Search the program for G68 coordinate rotation command and identify the active rotation block.
- 2
Locate any canned cycle commands (G73-G89) that occur after G68 and before the G69 cancellation command.
- 3
Either cancel rotation with G69 before the canned cycle, or expand the canned cycle into individual G01/G00 moves that can execute within the rotated coordinate system.
- 4
Re-activate G68 rotation after canned cycle completion if needed, and verify program execution in single block mode.
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
Get machine-aware diagnosis
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
Start freeWas this guide helpful?
Always verify with your machine manual or a certified technician before performing service procedures.