Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

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

Alarm 103003

Siemens 840D 103003 - MDI buffer cannot be deleted

This alarm occurs when attempting to delete the MDI buffer while it is being executed. Wait for execution to complete or perform an NC reset to resolve.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

103003

Siemens 840D 103003 - MDI buffer cannot be deleted

MDI buffer cannot be deleted

Siemens SINUMERIK message 103003: MDI buffer cannot be deleted. This is an operator information message from the SINUMERIK control. Note the complete message text as it may contain important parameter values.

Root Cause Summary

This alarm occurs when attempting to delete the MDI buffer while it is being executed. Wait for execution to complete or perform an NC reset to resolve.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    SAFETY: Ensure machine is in safe state

    Before any action, verify machine is stopped, spindle is off, and all axes are stationary. Check for any active tool changes or operations.

  2. 2

    Check execution status

    Verify if the MDI program is still running on the control display.

  3. 3

    Wait for completion or safe stop

    Allow the MDI program to finish executing, or use FEED HOLD followed by PROGRAM STOP if safe to interrupt.

  4. 4

    Retry deletion

    Attempt to delete the buffer again after execution completes.

DIY Feasiblehigh confidence

Call a technician if:

  • ·If the alarm persists after NC reset
  • ·If the MDI buffer remains locked despite no visible execution

Prevention

  • Always verify machine is in safe state before buffer operations
  • Avoid deleting MDI buffer during program execution
  • Monitor execution status before making changes
  • Use FEED HOLD before attempting to stop MDI execution if interruption is necessary

Common Mistakes

  • Attempting deletion without checking if MDI is running
  • Ignoring the need for an NC reset

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Always verify with your machine manual or a certified technician before performing service procedures.