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Navigate to the tool management screen (TOA) and identify the tool number active when the alarm occurred from the alarm buffer or NC program.

Check all parameter fields for the tool, especially the number of cutting edges (D-offsets) and verify no fields contain invalid characters, extreme values, or are blank when they should contain data.

Delete and recreate the tool entry with correct parameters, ensuring the cutting edge count matches the actual D-offset entries configured.

Back up tool data before deleting. Document all original values for reference.

Perform a power cycle (full control restart) to clear memory cache and reload tool data, then test with the recreated tool.

Review the NC program at the block number shown in the alarm message, focusing on tool calls (T command), D-offset selections, and any system variable access related to tool data.

Verify that the D-offset number called in the program (e.g., D1, D2) does not exceed the number of cutting edges defined for that tool in the tool management table.

Check for any READ operations or system variable calls (e.g., $TC_DP parameters) that attempt to access tool compensation data and verify correct syntax per SINUMERIK programming manual.

Correct any syntax errors found, save the program, and reset the alarm before restarting the program from a safe position.

Access the control via HMI Advanced mode and navigate to Commissioning > System Data > Tool Management to check file integrity indicators.

Access to system files requires appropriate password level (manufacturer/service level).

Create a complete backup of NCK and PLC data, then restore tool management files from a known good backup if available, or export/import tool data to regenerate database structure.

Ensure valid backup exists before attempting restoration. Document all current settings.

If no backup available, export all tool data to CSV format, delete tool management database, perform NCK reset to defaults for tool system only, then re-import tool data.

This procedure will reset all tool-related settings. Coordinate with production management before proceeding.

Perform a complete control reboot, verify tool data integrity by manually checking several tools, and run a test program with multiple tool changes to confirm resolution.