Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-45 minutes

Alarm 16924

Siemens 840D 16924 - Channel caution: program test modifies tool management data

Tool management data is changed during program testing. It is not possible to automatically rectify the data after termination of the program testing. This error message prompts the user to make a backup copy of the data or to reimport the data after the operation is terminated.

Siemens SINUMERIKServo/AxisIntermediate30-45 minutes

16924

Siemens 840D 16924 - Channel caution: program test modifies tool management data

Channel caution: program test modifies tool management data

Tool management data is changed during program testing. It is not possible to automatically rectify the data after termination of the program testing. This error message prompts the user to make a backup copy of the data or to reimport the data after the operation is terminated.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Program test mode activated while tool management modifications are running
  • Tool offset, tool life, or wear data being updated during program verification
  • Tool table entries being written to during dry run or single-block execution
  • Macro or subroutine modifying tool data parameters during testing cycle

Troubleshooting Steps

  1. 1Exit program test mode immediately and verify tool management data integrity by comparing current values against last known backup
  2. 2Check tool offset table and tool life counter values for unexpected changes or corruption
  3. 3Review program logic to identify any tool data modification commands (M-codes, G-codes, or macro calls) that should not execute during test mode
  4. 4Restore tool management data from backup if corruption is confirmed, then restart program test with test mode safeguards enabled
  5. 5Consult machine builder documentation to confirm whether tool data writes should be suppressed during program test execution

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