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Identify the active T-number from the alarm detail or NC program line where the error occurred.

Navigate to tool management: Main Menu > Parameters > Tool Data > Select the specific tool number.

Check parameter $TC_DP6[T,D] (tool type). Verify it contains a valid value according to your machine configuration (e.g., 100-199 for mills, 200-299 for drills). Consult machine documentation for valid types.

Note the current value before making changes for potential rollback.

Correct the tool type to a valid value matching the actual tool geometry, save changes, reset the alarm, and retest the program.

Access machine data in service mode: Main Menu > Commissioning > Machine Data > Search for MD18800 (TOOL_TYPE).

Accessing machine data requires protection level 2 or higher. Incorrect changes can affect machine operation.

Verify that the tool type number from $TC_DP6 has a corresponding entry in MD18800-MD18819 array with proper configuration.

If the tool type is missing, consult Siemens documentation to add the appropriate machine data configuration for that tool type, or change the tool to use an existing configured type.

Contact machine builder or Siemens support before adding new tool types to verify compatibility with machine kinematics.

Perform a control restart (power cycle or NCK reset) after machine data changes, then verify alarm is cleared.

Review the NC program line causing the alarm and note the T-number being called.

Check if the tool exists: Tool Management > Tool List. Search for the specific tool number to verify it has been created in the system.

If tool does not exist, create new tool with correct parameters: New Tool > Enter tool number > Define tool type ($TC_DP6) > Enter geometry and cutting data.

If tool exists but appears incomplete, delete and recreate the tool entry with complete data, or manually populate all required tool parameters including type, geometry, and offsets.

Deleting tools will remove all offset and wear data. Document existing values before deletion.