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Access the tool management system and identify the tool referenced in the NC program when the alarm occurred.

Check the cutting edge parameter field for the tool - verify it contains valid numeric values within the permissible range (typically 1-99 depending on system configuration).

Delete and re-enter the user cutting edge data for the affected tool, ensuring all offset values (geometry and wear) are properly defined for each cutting edge.

Back up tool data before making changes to prevent data loss.

Reset the alarm, reload the tool data, and test the NC program with the corrected tool parameters.

Review the NC program at the block where the alarm occurred and locate all tool calls (T-word) and cutting edge selections (D-word).

Verify that the D-word number matches an existing cutting edge defined in the tool management system for the active tool.

Check that the cutting edge number does not exceed the maximum number of user cutting edges configured for that specific tool type.

Correct the NC program syntax, ensure proper T and D word correspondence, and re-execute the program after alarm reset.

Check machine data MD18118 (MM_NUM_USER_CUTTING_EDGES) to verify the maximum number of user cutting edges allowed is properly configured for your system.

Changing machine data requires PLC access level and may require control restart.

Verify that the tool type definition in the tool list matches the actual tool configuration (e.g., drill, mill, turn) and supports user-defined cutting edges.

Check for any recent changes to tool management settings or after a system update that may have altered the cutting edge data structure.

If necessary, reload default tool management configuration or restore from a known good backup, then reconfigure tool data and test.

Ensure you have a complete backup before restoring system configurations.