104124

Identify the tool number referenced in the NC program at the alarm location (check current block display).

Open tool management (e.g., via HMI: Machine -> Tool Management) and locate the problematic tool number.

Check the tool type field - verify it contains a valid type (e.g., 100-199 for milling, 500-599 for turning, etc.) according to Siemens tool type definitions.

If empty or invalid, assign the correct tool type based on the actual tool geometry, save the tool data, and reset the alarm.

Ensure the tool type matches the actual physical tool to prevent collisions or incorrect compensation calculations.

Backup current tool data via HMI: Commissioning -> System Data -> Tool Management -> Archive.

Always create backup before any database repair operations.

Check NCK diagnostics: Diagnostics -> Service -> NCK -> Tool Management for database consistency errors or warnings.

Perform tool database reorganization: Commissioning -> System Data -> Tool Management -> Reorganize Database.

If reorganization fails, restore from a known good backup or re-enter tool data manually, then power cycle the control.

Review the NC program block where the alarm occurred and note the T-number being called (e.g., T5, T123).

Verify in Tool Management if this tool number exists in the active tool list or magazine configuration.

If tool does not exist, either create a new tool entry with correct type and parameters, or correct the NC program to reference an existing tool.

If using tool management with multiple magazines, verify the tool is assigned to the correct magazine and location accessible by the current channel.