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Locate the program line number shown with the alarm and examine the G31 block in the part program.

Verify that at least one valid axis (X, Y, Z, etc.) with a target coordinate is specified in the G31 block (e.g., G31 Z-50.0 F500).

Check for typographical errors in axis letters or missing coordinate values following the axis designation.

Correct the G31 block to include proper axis movement and re-run the program from a safe position.

Always perform a dry run or single block execution after program modification to verify correct operation.

Review the G31 block and identify if rotary axes (A, B, or C) are the only axes programmed for movement.

Check parameter 6201 (skip signal axis mask) to verify which axes are enabled for high-speed skip operations.

Record original parameter values before making any changes. Incorrect parameter settings can cause machine damage.

If rotary axis skip is not supported, reprogram using a linear axis (X, Y, or Z) for the skip operation, or use standard G31 with linear interpolation.

Test the modified program in single block mode to confirm alarm is cleared and operation is correct.

Verify that parameter 6200#0 (high-speed skip function enable) is set to 1 to enable the G31 feature.

Parameter changes require appropriate access level and should only be performed by qualified personnel.

Check parameter 6201 to confirm that the axes used in the G31 command are enabled for skip operations (bit 0=X, bit 1=Y, bit 2=Z, etc.).

Verify the skip signal input is properly wired to the correct input terminal as specified in the machine builder's electrical documentation.

Use the PMC ladder or I/O diagnostic screen to confirm the skip signal input can be activated and is visible to the control before executing G31.