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Access Diagnostics > Tool Management in the MMC. Verify actual magazine occupancy against MD 20050 (tool magazine max capacity). Compare physical magazine state against the NCK's internal location bitmap.

Do not force tool changes while magazine is full; this can damage the tool changer.

Check PLC tool magazine status via the tool changer interface (typically OB 240 tool change routine). Review the location bitmap in the tool management DB to ensure empty slots are correctly flagged. If bitmap is incorrect, perform a manual magazine inventory via MMC Setup > Tool Management > Refresh Inventory.

Verify MD 20070 (tool magazine location type) and MD 24100-24199 (tool location assignment table) are correctly configured for your magazine geometry. Confirm that occupied/empty slot flags match physical reality by manually checking 3-5 random locations.

If bitmap corruption is suspected, perform a warm restart of the NCK (Diagnostics > System > Warm Start). This forces the tool management system to reinitialize the location table from EEPROM parameters.

In the MMC, navigate to Diagnostics > Parameters > MD (machine data). Search for MD 24100 and review entries up to MD 24199. Verify that the tool location table contains valid slot numbers matching your magazine capacity (1 to N, where N = MD 20050).

Cross-reference the tool table (Tools > Tool Data) with the location assignments. Confirm that the tool %2 mentioned in the alarm has a valid location number assigned (typically via the tool's 'Magazine Location' or 'Slot' field), and that this location number is defined in MD 24100-24199.

Unassigned tools (location = 0 or blank) cannot be moved into the magazine.

Check MD 20080 (tool change strategy) and MD 20090 (tool magazine type) to ensure the location assignment logic matches your tool changer's hardware configuration. Mismatch between these and the actual MD 24100-24199 table will cause location lookup failures.

If parameters are missing or corrupted, restore from backup or manually repopulate MD 24100-24199 with sequential valid location numbers. After correction, perform a cold restart (Diagnostics > System > Power-Off, full cycle) and verify tool move commands execute.

Check Diagnostics > Axis > Servo Status for the tool changer axis (typically listed as 'Tool Change' or axis name per MD 30000 axis name assignment). Verify the axis is in Ready state with no active alarms (6050, 6060, 6070 range). If faulted, review the axis alarm history and resolve the underlying servo issue before retrying.