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Note the N-block number where the alarm occurred from the CNC display or alarm history.

Review the program block and the 5-10 blocks preceding it for duplicate axis letters (e.g., G01 X10.0 X20.0 or multiple X, Y, Z commands).

Check for axis letters that appear in both the block coordinates and any active G68 rotation, G51 scaling, or coordinate system transformations that might create conflicts.

Correct the program by removing duplicate axis commands or restructuring the move sequence to separate conflicting operations into distinct blocks.

Identify the exact program line causing the alarm and check for unusual axis letters or axis names not standard to your machine configuration.

Verify machine axis configuration in parameters 1020-1023 (axis name assignments) to confirm which axes are enabled and their designated letters.

Check if the program was post-processed for a different machine configuration with additional axes (e.g., A, B, C rotary axes) that your machine does not have.

Edit the program to remove or comment out commands for non-existent axes, or reconfigure the post-processor for correct machine axis configuration.

Verify axis availability with machine documentation before modifying parameters.

Check the active plane selection mode (G17/G18/G19) at the alarm block and verify axes commanded are appropriate for that plane.

Review any active G68 coordinate rotation, G51 scaling, or G16 polar coordinate commands that may be creating axis interpretation conflicts.

Verify work coordinate system changes (G54-G59) are properly sequenced and not causing axis designation conflicts during coordinate transformation.

Add modal cancellation commands (G15, G50, G69) before the problem block to reset transformations, or restructure the program logic to avoid conflicting modal states.

Test program in single block mode after modifications to verify proper execution.