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Note the T-number from the alarm message and navigate to tool management (Offset → Tool List or Machine → Tool Management).

Locate the specific tool number and check the 'Type' parameter field - verify it contains a valid tool type number (typically 100-999 for standard types).

If tool type is missing or shows zero, enter the correct tool type based on your tool configuration (e.g., 500 for drill, 200 for face mill, etc.).

Tool type definitions vary by machine configuration - consult your machine tool type table before assigning values.

Save tool data, reset the alarm, and restart the NC program from a safe position.

Access Commissioning mode (Service → Settings → Service Switch → Level 3) and navigate to Machine Data or Tool Type configuration.

Commissioning mode access requires appropriate password and authorization level.

Review SD 42700 TOOL_TYPE_x settings or check the ToolsWear.def and ToolType configuration files to verify the tool type exists in system definitions.

If the required tool type is missing, add the tool type definition with appropriate geometry axes and parameters, or change the tool data to use an existing valid tool type.

Modifying machine data affects machine behavior - document original settings and consult OEM documentation before changes.

Execute NCK reset (power cycle or warm restart) to activate configuration changes, then verify tool type is now recognized.

Verify the active channel configuration and technology type (milling, turning, grinding) by checking the machine data MD 20110 ASSIGNED_CHAN_NAME.

Cross-reference the tool type number against the technology-specific valid tool types - milling typically uses 100-500 series, turning uses 500-800 series.

Correct the tool type in tool data to match the active technology, or load the tool in the appropriate channel if multi-technology machine.

Clear alarm, perform a tool preselect (T-number), and verify tool change executes without error.