Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

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

Alarm 105028

Siemens 840D 105028 - Selection is impossible

This alarm occurs when a program selection or function is not possible due to syntax errors or unsupported features. Correct the program or verify control options to resolve.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

105028

Siemens 840D 105028 - Selection is impossible

Selection is impossible

Siemens SINUMERIK operator message 105028: Selection is impossible. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.

Root Cause Summary

This alarm occurs when a program selection or function is not possible due to syntax errors or unsupported features. Correct the program or verify control options to resolve.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    SAFETY FIRST - Stop all operations

    Ensure machine is in a safe state, spindle stopped, and all axes are secure before making any program changes.

  2. 2

    Locate error block

    Check the alarm message for the line number and open the program to find the issue. Do not attempt to run the program until corrected.

  3. 3

    Fix the code

    Correct the syntax, G code, or parameter error in the identified block. Verify changes against programming manual.

  4. 4

    Test safely

    Clear the alarm, perform dry run or single block execution first, then test with reduced feedrates and proper workholding.

DIY Feasiblemedium confidence

Call a technician if:

  • ·If the alarm persists after program correction
  • ·If system parameter changes are required
  • ·If unsure about program modifications that could affect safety
  • ·If the required option cannot be enabled without assistance

Prevention

  • Always validate programs using simulation before execution
  • Ensure G codes match the control's capabilities and enabled options
  • Maintain documentation of available control options and functions
  • Use single block or dry run mode when testing modified programs

Common Mistakes

  • Overlooking the specific line number in the alarm
  • Assuming all functions are supported by default

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