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Review the program line that triggered the alarm and verify G31 command syntax includes all required axes and feedrate (e.g., G31 Z-100. F500).

Check that skip signal input (typically G31 uses skip signal 1-4) is properly configured in parameter 6200-6203 and connected to the machine.

Verify that any macro variables referencing skip position data (#5061-#5068 for 1st skip signal) are only called AFTER a successful G31 skip measurement has been completed.

Ensure G31 command is programmed in a valid movement mode and not called while in a canned cycle or other incompatible G-code state.

Verify the program sequence ensures G31 skip measurement is executed before attempting to read skip position variables (#5061-#5068).

Check that the correct skip signal number is being referenced (G31 P1-P4 corresponds to different system variable sets).

Review parameters 6200 series to confirm skip signal inputs are properly enabled and assigned to correct input pins.

Incorrect parameter settings may prevent skip data from being stored properly

Test skip signal functionality in MDI mode with a simple G31 move and verify skip input is being recognized by observing position stop when signal activates.

Review parameters 6241-6244 to verify multi-step skip function is enabled if using G31.1, G31.2, or G31.3 commands.

Check bit 5 of parameter 6200 (SKPx) to confirm high-speed skip is enabled if required by the application.

Enabling high-speed skip may require optional control features

Verify that skip data buffer size parameters (6254-6257) are set appropriately for the number of skip points being collected.

Simplify the skip operation to basic G31 P1 with single skip point to isolate whether issue is with advanced skip features or basic skip functionality.