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Access Diagnostics > Tool Management > Magazine Configuration in SINUMERIK Operate or HMI. Verify MD 20150 tool type matches the magazine location type in MD 20200-20210 (slot compatibility matrix).

Check tool geometry in tool table (SD 32100-32150 range). Compare tool length/diameter against MD 20210 location dimension limits. Use Measure Tool function to verify actual dimensions match database entries.

Incorrect tool offset data (MD 20210) will cause persistent rejection even if tool is physically compatible.

Regenerate the magazine structure via NCK > Tool Management > Recalculate Magazine if location type assignments were recently changed. Clear any corrupted tool database entries via Reset Tool Data function.

Manually assign the tool to a compatible location by editing SD 32000 (tool location assignment) or use manual tool placement mode to verify location acceptance.

Navigate to Diagnostics > Tool Management > Magazine Status. Verify location %4 shows 'Free' status and is not marked as 'Blocked' or 'Maintenance' in the location state table.

Check MD 20220 (location enable/disable mask) for bit flags. If location is disabled, set the corresponding bit to enable the location or remove the maintenance flag via HMI Tool Management interface.

Do not manually override MD 20220 without verifying physical location integrity; a blocked location may indicate hardware damage.

Review PLC tool change program (typically in Cyclic Interrupt OB or Tool Management SFB). Verify the occupancy check logic at location %4 is not incorrectly flagging the location as occupied. Sync tool database via 'Refresh Magazine Status' command.

If location remains persistently blocked, perform a full Tool Magazine Initialization (Diagnostics > Tool Management > Initialize Magazine) to reset all location states and re-inventory tools.

Confirm tool %2 exists in the tool table by accessing Diagnostics > Tool Data > List All Tools. Verify the tool entry in SD 32000 series has valid location assignment and pocket number matching magazine structure.

Check for tool database corruption by exporting the complete tool table (Diagnostics > Export Tool Data) and comparing against the backup or original file. Re-import if discrepancies are found.

Importing corrupted tool data will propagate the error. Use the most recent known-good backup.

Verify the magazine %3 pocket count in MD 20180 (Number of locations per magazine) matches the actual physical magazine. If pocket count was reduced, tool assignments beyond the new limit will fail.

Clear the tool database cache and perform a full Tool Inventory cycle (Diagnostics > Tool Management > Inventory Mode). This re-synchronizes the NCK tool database with physical magazine state.