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Access NCK Parameters via HMI: Navigate to Diagnostics > Machine Data > Tool Changer Section. Verify MD20150 (Tool changer type) and MD20160 through MD20175 (distance relations, spindle offset, magazine geometry) are populated with valid numeric values, not zero or blank entries.

Do not modify machine data without backing up current configuration via SINUMERIK Operate backup function.

Check Part Program: Verify the T-word (tool call) in the block contains a valid tool number corresponding to a tool defined in the tool table (SD54100-series for Tool Management). Use Cycle > Tool Management menu to confirm tool and magazine slot assignments exist.

Verify spindle reference position is defined: Check MD10210 (spindle axis assignment) and confirm the spindle Z-axis home position (MD20200 - Spindle reference point) aligns with the tool changer's approach distance. Manually jog spindle to known safe position and update reference if needed.

Reload machine data and soft-reset the NCK: Press Control Panel > System > Reload Parameters, then perform a warm restart (not cold). Re-run the tool change cycle to confirm distance relation is now recognized.

Home the tool changer magazine: Execute the tool magazine reference run. In HMI: Diagnostics > Axis > Machine Axes, select the tool changer axis (check MD20140 for axis designation) and press Reference Point button. Wait for completion and verify status shows 'Referenced'.

Ensure spindle is at safe retract height before initiating tool changer reference. Collision risk exists if spindle is in tool change position.

Verify tool changer axis parameters: Check MD20140 (tool changer axis type), MD20145 (tool changer approach distance), and MD20155 (tool changer speed). Confirm these match physical hardware. If tool changer is a rotary magazine (turret), verify rotary axis assignments in MD1005 series.

Run tool change diagnostic cycle: Use HMI Diagnostics > Functions > Tool Change Test. Manually select a tool number and initiate change without CNC program. Observe if magazine moves and spindle responds. Log any error codes.

If magazine axis does not move, verify PLC connection: Check NCK/PLC coupling in Diagnostics > Signals > Tool Changer I/Os. Confirm magazine motor enable signals (typically DB21.DBX... for tool changer control) are present and fault-free.

Inspect the active tool change macro: Navigate to Program > Edit > Subprograms and locate the tool change routine (typically _TOOL_CHANGE or similar, referenced in MD20100). Check for M6 macro definition and verify it contains distance relation checks before motion commands.

Reload factory tool change cycle: If custom macro exists, replace with Siemens standard cycle via SINUMERIK Operate Package Manager. Download the standard tool change macro corresponding to your tool changer model (e.g., ATC turret vs. linear changer) and re-compile.

Back up current macro before replacement. Custom macros may contain site-specific logic.

Clear program memory and reinitialize: Perform Factory Reset of CNC part programs (Diagnostics > System > Delete Programs). Reinstall OEM tool change cycles and verify alarm clears on next tool change attempt.