084

Review the program block shown in the alarm display and identify which G-code command is active during scaling mode.

Check for G28, G30, G52, G92, G41, G42, G43, G44, or any canned cycle (G73, G74, G76, G80-G89) between G51 and G50 commands.

Move the prohibited command outside the scaling block by issuing G50 (cancel scaling) before the command, then reactivate G51 if needed afterward.

Verify program execution in single block mode to confirm the alarm is cleared and machining coordinates are correct.

Always verify scaled dimensions with a dry run or first article inspection after program modifications.

Locate the G51 command line in the program and verify the format matches control requirements: G51 X_ Y_ Z_ P_ (or I_ J_ K_ for center point).

Confirm scaling factor P is within allowable range (typically 0.001 to 999.999, check parameter manual for your specific control model).

Verify center point coordinates are specified if required by your control configuration, and that all required axes are defined.

Cross-reference the G51 syntax with your specific Fanuc control series programming manual (0i, 31i, etc.) as format varies slightly between models.

Scaling parameters are modal and remain active until cancelled with G50—ensure intentional use.

Search the program for G17, G18, or G19 plane selection commands between G51 activation and G50 cancellation.

Check for work coordinate system changes (G54-G59.3) within the scaling block that may conflict with the scaling center point.

Establish the correct plane and work coordinate system before activating G51 scaling, and avoid changing them until G50 cancels scaling.

If plane or coordinate changes are necessary, structure the program to cancel scaling (G50), make the changes, then reactivate scaling (G51) with appropriate parameters.

Document scaling center points clearly in program comments to prevent coordinate system confusion during edits.