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Access Diagnostics > Machine Data > 20000-20099 (Tool Changer) in NCK menu. Verify MD20054 matches the actual magazine slot count. Cross-reference with machine documentation for your specific ATC carousel or linear magazine.

Do not modify MD values during active cycle. Stop NC program execution first.

In part program, check all T-calls and verify requested tool numbers/pockets do not exceed MD20054 value. Use Part Program Trace (Diagnostics > Program Trace) to identify which T-value triggered alarm. Compare against tool table (tool.tbl or equivalent in your control version).

If MD20054 value is incorrect, update it to match physical magazine capacity. Typical carousel magazines have 12-40 locations; verify with hardware specification sheet. After parameter correction, reload part program and test with single dry-run cycle.

Navigate to Offsets > Tool Data screen. Locate the tool entry associated with the alarm's tool number. Check the 'Magazine Location' or 'Pocket' field value against the actual magazine slot layout and MD20054 limit.

Verify that tool offset entries do not have gaps or duplicates in magazine location assignments. Use Sort or List function to review all active tool entries sequentially. Confirm no two tools share the same pocket number unless magazine supports dual-gripper configuration (check MD20052).

Modifying tool offsets while tools are mounted in magazine may cause subsequent tool changes to fail. Perform this task with magazine unloaded if possible.

Correct invalid magazine location entries in tool offset table. Re-map tools to available, unoccupied slots within the MD20054 range. Save offset data and retry the tool change command.

Check machine configuration: Navigate to Diagnostics > Machine Data > MD20050 and MD20051. Determine if system uses single or multiple magazine configuration. If MD20050 = 0 (single magazine), skip to alternative causes. If MD20050 > 0, verify which magazine number is currently selected and active.

For multi-magazine systems, review part program for explicit magazine selection commands (M-functions or special G-code for magazine switching, typically M6xx or M1xx range per machine builder). Ensure tool changes are not intermixed between magazine locations without proper magazine positioning cycles between calls.

Magazine switching may require dwell time. Check MD20057 (Tool Change Time) for potential coordination issues.

If multiple magazines exist, physically verify that the tool at the requested location is loaded in the correct magazine. Cross-reference tool.tbl or offset data against actual physical magazine numbering. Update NC program or offset data to specify correct magazine location if discrepancy exists.