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Note the tool number (T value) referenced in the NC program at the alarm position.

Access the tool management menu (Offset/Tool menu) and verify if the tool number exists in the tool list.

If tool is missing, create a new tool entry with proper geometry and offset data, or modify the NC program to use an existing tool number.

Ensure tool geometry values are accurate before running production to prevent collisions.

Reset the alarm and restart the program from a safe position to verify the correction.

Check the tool list display to verify the magazine location assignment for the requested tool number.

Physically verify that the tool is installed in the specified magazine pocket position.

Switch to JOG mode and ensure machine is in a safe state before accessing the magazine area.

If tool is missing, load the correct tool into an available pocket and update the magazine management data to reflect the new location.

Perform a magazine reference or tool list refresh if available, then clear the alarm and restart the program.

Review machine data MD18102 (MM_NUM_TOOL) and MD18100 (MM_TYPE_OF_TOOLMAN) to verify tool management is properly configured and active.

Only modify machine data if you have proper authorization and have documented current settings.

Check for tool administration settings under service/commissioning mode to verify tool data is not locked or disabled.

Export and inspect the tool list data file for corruption or unusual entries that may prevent tool access.

If configuration error is found, restore from a known good backup or contact Siemens service for system data recovery procedures.

System data modifications require machine downtime and should be scheduled appropriately.