6432

Verify that the NC program issues a valid T-word (tool selection) followed by M6 (tool change confirmation) before any operation requiring the tool (spindle rotation, tool length offset G43/G44, or tool life monitoring). Check the part program sequence at the point where alarm 6432 occurs.

In the Siemens HMI, navigate to Diagnostics > Alarms and note the exact NC line number triggering the alarm. Trace back in the part program to confirm M6 was issued and completed.

Check parameter MD 20410 (tool life/quantity monitoring enable flag) and MD 20411 (tool life monitoring type). If these are enabled but no tool is assigned, the alarm will fire. Temporarily disable monitoring or ensure tool selection precedes the monitored operation.

Do not permanently disable tool monitoring without management approval; this impacts tool life tracking.

Verify tool data exists in the Tool Management System (TMS) accessible via Diagnostics > Tool Data or via external tool table import. Confirm the T-number referenced in the program exists in the active tool magazine/holder definition.

Access Diagnostics > Machine Data and search for MD 24010 (spindle assignment to tool holder). Confirm the spindle number is correctly linked to a valid tool holder number. Repeat check for all active spindles (MD 24010, MD 24110, MD 24210, etc. depending on spindle count).

Navigate to Setup Data (SD) for the active spindle and verify the tool holder reference is populated. Check SD 43410 (tool holder number assigned to spindle). If blank or zero, assign the correct tool holder number and save.

Incorrect tool holder assignment can cause tool offset and collision detection failures.

In the Tool Management interface, verify that the tool pocket physically contains a tool and the tool changer status shows the correct tool loaded in the active spindle. Run a manual tool change (M6 with T-number) and confirm the tool changer feedback confirms tool in spindle.

If using automatic tool changer with pocket tracking, verify the tool carousel/magazine synchronization via the PLC diagnostic screens (Diagnostics > PLC > Variable List). Check the tool magazine index variable matches the actual tool position.

Check the recent alarm history in Diagnostics > Alarms for any tool changer faults (alarms 6430, 6431, or 6470 series) that may have preceded alarm 6432. These indicate M6 did not complete successfully or tool clamp confirmation signal failed.

Manually execute M6 via the HMI (Program > Single Block or MDI mode) with a valid T-number and verify the tool changer physically moves and the spindle tool clamp engages. Check PLC input I/O status (Diagnostics > PLC > Inputs/Outputs) for the tool-in-spindle confirmation signal (typically a digital input on axis 1 or spindle axis). This signal should pulse or go high when M6 completes.

Ensure the spindle is stopped and the work area is clear before manually executing M6.