Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 104011

Siemens 840D 104011 - Error on deleting tool

Alarm 104011 occurs when the system cannot delete a tool from the tool management system due to active references or protection status. The tool being deleted may still be referenced in an active NC program, called in the tool buffer, or has write protection enabled. This alarm prevents deletion to maintain system integrity and avoid tooling conflicts.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

104011

Siemens 840D 104011 - Error on deleting tool

Error on deleting tool

Siemens SINUMERIK alarm 104011: Error on deleting tool. This alarm indicates an error condition in the NC program or control configuration that must be resolved before the operation can continue.

Root Cause Summary

Alarm 104011 occurs when the system cannot delete a tool from the tool management system due to active references or protection status. The tool being deleted may still be referenced in an active NC program, called in the tool buffer, or has write protection enabled. This alarm prevents deletion to maintain system integrity and avoid tooling conflicts.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Check the current tool status in the spindle and tool magazine using the tool management screen (HMI: Tool List or Tool Management).

  2. 2

    If the tool is loaded, execute a tool change (T command) to select a different tool and clear the current tool reference.

    Ensure machine is in a safe position before executing tool change

  3. 3

    Review any active or interrupted NC programs (STOP or HOLD state) that may still reference this tool number.

  4. 4

    Execute program reset (RESET button) to clear all program references, then retry the tool deletion.

    Program reset will clear current program position and modal states

Service Recommended confidence

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