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Review the program line indicated in the alarm. Identify if G41, G42, G43, G44, G51, G68, or G52 is being called while in polar coordinate mode.

Check if polar coordinate mode was properly cancelled with G13.1 before attempting to use these commands. Search backward in the program for G12.1 without a corresponding G13.1.

Restructure the program to cancel polar coordinate mode (G13.1) before executing incompatible G-codes, or move the incompatible commands outside the polar coordinate section.

Ensure tool compensation and work offsets are applied in the correct sequence when modifying program structure.

Verify program by running in single block mode or using the graphics simulation to confirm proper G-code sequencing without conflicts.

Identify the axis pair specified in the G12.1 command (e.g., G12.1 X_ Y_ specifies X-Y plane). Note which axis is the center and which is the rotational axis.

Check the alarm line and surrounding blocks for commands involving the third linear axis (e.g., Z-axis movement when polar mode is active in X-Y plane).

Remove or relocate any third-axis movements to occur before G12.1 or after G13.1. If Z-height changes are needed, cancel polar mode, make the move, then re-enter polar mode.

Frequent mode switching may affect cycle time. Consider redesigning the toolpath strategy for efficiency.

Verify the corrected program section executes without alarm and produces the intended toolpath using machine simulation or dry run.

Locate the G12.1 command prior to the alarm. Verify it includes both required axis addresses with center point coordinates (e.g., G12.1 X0 Y0 R_).

Confirm the radius designation (if required by your specific Fanuc control model) is correctly specified. Consult your parameter manual for exact G12.1 syntax requirements.

G12.1 syntax varies slightly between Fanuc series (0i, 30i, 31i, etc.). Verify against your specific control documentation.

Check that incremental/absolute mode (G90/G91) is appropriate for your polar coordinate programming method. Some applications require specific modal settings.

Correct the G12.1 command syntax, reset the program, and test the polar interpolation section in single block mode to verify proper operation.