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Check the program line causing the alarm and note the tool number commanded (e.g., T25, T99, etc.).

Navigate to SYSTEM > PARAM and check parameter 3107 (machining center) or parameter 5004 (lathe) to verify the maximum tool number setting. For example, if parameter 3107 = 24, any T code above T24 will trigger this alarm.

Verify the actual tool magazine capacity matches the parameter setting. Check parameter 3022 (number of magazine pots) for machining centers or parameter 5010 (number of turret stations) for lathes.

Either correct the tool number in the program to a valid tool within range, or increase the parameter value if the physical magazine supports more tools and the incorrect parameter was set during machine configuration.

Changing parameter 3107 or 5004 requires parameter write enable (parameter 0000 bit 0 = 1) and should only be done if machine hardware supports the higher tool count.

Review the program block causing the alarm for formatting issues. Tool numbers must be whole integers without decimal points or special characters (e.g., T12.5 or T-3 are invalid).

If T0 is commanded, check parameter 3117 bit 0 (machining center) or parameter 5002 bit 1 (lathe). If this bit prohibits T0 commands, either change the program to avoid T0 or modify the parameter if T0 should be allowed for your application.

Check for macro variable substitution errors. If using #variables for tool numbers (e.g., T#500), navigate to SYSTEM > CURRENT and verify the macro variable contains a valid integer value within allowable range.

Verify proper T code syntax per Fanuc programming standards: T followed by up to 4 digits for machining centers (T0001-T9999) or 2-4 digits for lathes depending on parameter 5002 bit 4 setting.

For lathes with gang tooling or turrets, tool number format may include station and offset encoded together—consult machine builder documentation.

Navigate to SYSTEM > PARAM and verify ATC-related parameters are correctly configured: parameter 3020 (ATC system type), parameter 3021 (tool selection method), and parameter 3023 (random/fixed ATC type).

Check the tool data table under OFFSET SETTING > TOOL or via parameter 13210-13219 (tool life management). Verify that tool data entries exist for the commanded tool number if tool life management is enabled (parameter 3111 bit 1 = 1).

Review parameter 3101 (tool change command type) to ensure it matches the machine's M06 or other tool change implementation. Incorrect settings may cause valid tool numbers to be rejected.

Modifying ATC control parameters can affect automatic tool change operation. Document original values before making changes.

If alarm persists after parameter verification, perform a ladder diagram check via SYSTEM > PMC > PMC PARAM to ensure tool number validation logic in the PMC ladder is not imposing additional restrictions beyond CNC parameters.

PMC ladder modifications require machine builder documentation and should only be performed by qualified personnel.