6450

Review the NC program block %2 for the TCI command syntax. Verify the magazine location parameter is not 0 (spindle position). Check Tool Table (TOOL.TBL) and TOOLC.DEF for valid buffer indices.

Access Diagnostics → Tools → Magazine/Gripper via HMI or NCK menu. Confirm active tool position and available gripper/buffer slots. Spindle location should not be addressable via TCI.

Modify NC program: replace TCI command with correct gripper buffer index (typically 1–N, where N is total buffer count). Consult machine documentation for valid magazine zone assignments.

Do not program TCI with index 0 or any spindle-equivalent location.

Perform single-block test run (cycle start in JOG, TEACH, or DRY RUN mode). Monitor alarm log (Diagnostics → Service → Alarm History) to confirm 6450 no longer fires.

In Diagnostics → Tools → Magazine Status, inspect all buffer positions. Identify which slots are marked as empty (no tool loaded). Cross-reference with the NC program's TCI magazine index.

Verify magazine initialization and tool loading. Check PLC program (typically OB100 or OB1 for tool changer initialization). Confirm all tool locations are properly registered in the tool table via Extras → Settings → Tools → Magazine Configuration.

Load the required tool into an available buffer position. Use manual tool change or magazine load function (HMI: Machine → Manual Operation → Tool Change). Re-run NC program with TCI targeting the newly occupied buffer slot.

Ensure tool changer and spindle are in safe (home/reference) position before any manual intervention.

Update NC program TCI index to point only to occupied magazine positions. Validate via single-block run and alarm history review.

Check Machine Data: access Diagnostics → Parameters (MD) and search for MD20150, MD20160, and any MD parameters containing 'Tool' or 'Magazine'. Verify values match machine documentation and tool changer hardware specification.

Inspect PLC tool magazine data block (usually DB41 in SIEMENS standard). Via STEP7 or online PLC diagnostics, confirm all buffer counters, occupancy flags, and location references are consistent with HMI magazine status display.

Perform machine warm restart (power cycle or soft reset): Power down CNC → wait 10 seconds → power up. This reinitializes PLC-to-NCK communication and magazine state variables. Re-run the problematic NC program block.

Ensure spindle and tool changer are at safe home position before restart.

If alarm persists, contact Siemens field service or consult machine OEM. Request validation of Machine Data backup and PLC firmware version compatibility with current NCK software level (check Diagnostics → Software → Version Info).