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Access Diagnostics > Tool Management > Tool Offset Table (via HMI or NCK menu). Identify the D offset number from alarm parameter %2 and verify TOOL_LIFE and TOOL_LIFE_LIMIT values.

Do not assume tool is expired; this is a prewarning only.

Compare current tool usage counter against configured limits. Check MD 20160 (time-based) or MD 20161 (quantity-based) to confirm which monitoring mode is active for the tool.

Review tool offset data: Navigate to Setup > Tools > Tool Offsets, select the D number, and examine TOOL_LIFE_TIME or TOOL_LIFE_QUANTITY fields. Reset or extend limits if tool is still serviceable.

Resetting tool life without physical inspection may cause tool breakage and machine crash.

After tool replacement or offset adjustment, clear the alarm by pressing RESET on the operator panel or via NC program M00/M01 cycle stop and reset sequence.

Check if MD 11300 (MEASURE_TOOL_WEAR) is enabled. If true, navigate to Diagnostics > Measured Values > Tool Data and inspect the W offset cumulative wear value for the tool referenced in parameter %2.

Compare W offset wear accumulation against the WEAR_LIMIT defined in the tool offset table (Setup > Tools > Wear Offsets). Confirm the prewarning threshold is set appropriately via SD parameters in the tool record.

Physically measure tool wear using calibration or probe method. If wear is within acceptable limits, reset the W offset counter by selecting the tool offset and executing Offset > Reset Wear Value command.

Only reset wear counters after physical tool inspection; incorrect reset can lead to dimensional drift and scrap parts.

If tool is genuinely worn, replace the tool and update the D offset with new tool geometry. Clear alarm via RESET and resume production.

Review the NC program syntax where tool selection occurs (e.g., 'T1 D1'). Verify that the D offset number in parameter %2 matches the intended tool geometry offset record in the tool offset table.

Check Machine Data: Navigate to Commissioning > Machine Data > Tool Management and review MD 20160 (TOOL_LIFE_TIME), MD 20161 (TOOL_LIFE_QUANTITY), and MD 20162 (TOOL_LIFE_WEAR_LIMIT). Confirm these values align with actual tool life specifications from the tool vendor.

If prewarning threshold is inappropriately low, adjust the tool offset record: Setup > Tools > Tool Offsets > [Select D offset] > Modify TOOL_LIFE_LIMIT or TOOL_LIFE_WARN_LIMIT fields to realistic values based on tool life testing.

Setting limits too high delays tool replacement and increases tool breakage risk; setting too low causes nuisance alarms and production interruptions.

Save changes, clear alarm via RESET, and perform a trial run to verify alarm does not recur prematurely.