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Review the program line causing the alarm and identify the G12.1 or G13.1 command and the axes specified.

Verify that one linear axis (X, Y, or Z) and one rotary axis (typically C-axis) are specified for the active plane (G17, G18, or G19).

Check the plane selection command immediately before the polar coordinate command. For G12.1 in G17 plane, typical format is G12.1 with X or Y as linear and C as rotary.

Correct the axis specification to match the required linear-rotary pair for polar interpolation and re-run the program.

Locate the polar coordinate command in the program and check if G17, G18, or G19 is programmed before G12.1/G13.1.

Verify the plane selection matches the intended axes: G17 for XY plane, G18 for ZX plane, G19 for YZ plane.

Add or correct the plane selection command in the program block before the polar coordinate command.

Ensure the plane selection is compatible with your machine's rotary axis configuration.

Reset the alarm, restart the program from a safe position, and verify proper execution.

Check machine parameter 1006 to verify which axes are configured and confirm the rotary axis (C-axis) is properly defined.

Document current parameter settings before making any changes.

Verify parameter 1022 (axis name assignment) to ensure the rotary axis name matches what is programmed in the part program.

Check if the polar coordinate function is enabled in the control by verifying option settings and parameters 5400-5404 series for polar coordinate interpolation.

If configuration is incorrect, contact your machine tool builder or Fanuc representative for proper parameter settings for polar coordinate interpolation on your specific machine model.

Incorrect parameter changes can cause machine malfunction or damage. Backup all parameters before modifications.