104009

Check the NC program or HMI tool data entry for the tool type value being written. Review the exact line where the alarm occurred.

Verify the tool type number against Siemens documentation for valid tool types (consult Function Manual Basic Functions or tool type list in system documentation).

Correct the tool type to a valid value appropriate for the tool geometry (e.g., type 120 for end mill, 500 for twist drill, 400 for turning tool).

Reset the alarm and execute the tool data write operation again with the corrected tool type value.

Check setting data SD 42700 $SC_TOOL_MANAGEMENT_MASK and SD 42710 $SC_TOOL_MANAGEMENT_TOOLLIST to verify tool management is properly configured and not restricted.

Document current setting data values before making any changes.

Verify user access level and protection settings. Check if tool data modification requires higher access level (password level 2 or 3).

Attempt to write tool data manually through HMI tool offset page to isolate if issue is program-specific or system-wide.

If corruption is suspected, perform a tool data consistency check or reload tool management data from a known good backup. Consider reorganizing tool data using service functions.

Always create a complete backup of all tool data before performing reorganization or restoration operations.

Navigate to the tool offset page and check if the target tool number (T number) already has tool data defined with a different tool type.

Check machine data MD 18102 $MN_MM_TOOL_CHANGE_MODE and related tool change behavior settings that may restrict tool type modifications.

Delete the existing tool entry completely (tool number and all associated D-numbers) before attempting to redefine it with the new tool type.

Record all existing tool geometry and wear values before deletion, as this data will be lost.

Re-enter the tool with the correct tool type and reload all geometry parameters. Verify the tool type assignment is successful without alarm.