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Check the NC program line that triggered the alarm and note the T-number and D-number (cutting edge) being called.

Access tool management (TOA/tool offset menu) and verify the specified cutting edge (D-number) exists for the called tool and contains valid geometry data.

If cutting edge data is missing or shows invalid values (e.g., undefined length, radius), enter correct tool offset parameters or reload tool data from backup.

Ensure machine geometry offsets are properly configured before running production parts.

Reset the alarm, reload the NC program, and test in single-block mode to verify proper tool offset retrieval.

Identify the D-number called in the NC program at the alarm location and compare it against the tool's configured number of cutting edges in tool management.

Check machine data MD18102 $MN_MM_NUM_CUTTING_EDGES_IN_TOA to verify the maximum number of cutting edges allowed per tool in the system.

Do not modify machine data without authorization and proper documentation.

Either reduce the D-number in the NC program to stay within valid range, or add additional cutting edge definitions in tool management if physically applicable.

Reset alarm and verify the corrected program executes without error.

Perform a controlled shutdown and power cycle of the complete control system to reset communication paths between HMI and NCK.

Ensure machine axes are in safe position before power cycling the control.

Access tool management data and check for any unusual characters, blank entries, or error indicators in the tool offset tables that suggest data corruption.

If corruption is evident, restore tool offset data from a known good backup file or manually re-enter tool data from documented records.

Always maintain current backup copies of all tool offset data before making changes.

If problem persists after data restoration, check NCK archive for errors and consider loading complete archive backup or contact Siemens service for diagnostic support.