Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

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

Alarm 101402

Siemens 840D 101402 - Error on writing back the options.

Alarm 101402 occurs when the SINUMERIK 840D system fails to write back option data to the CompactFlash or persistent memory during a system configuration change or after an option activation. This typically indicates file system corruption, insufficient storage space, write protection issues, or hardware failures on the CF card or system memory module.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101402

Siemens 840D 101402 - Error on writing back the options.

Error on writing back the options.

Siemens SINUMERIK alarm 101402: Error on writing back the options. 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 101402 occurs when the SINUMERIK 840D system fails to write back option data to the CompactFlash or persistent memory during a system configuration change or after an option activation. This typically indicates file system corruption, insufficient storage space, write protection issues, or hardware failures on the CF card or system memory module.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Power down the NCU and remove the CompactFlash card. Inspect the write-protect switch on the card side and ensure it is in the unlocked position.

    Always power down the system completely before removing CF cards to prevent data corruption.

  2. 2

    Reinsert the CF card, power up the system, and attempt to activate options again through the commissioning interface.

  3. 3

    If the error persists, back up all data from the CF card to external storage using the Archive function or PCIN/PCOUT utilities.

    Ensure backup includes machine data, part programs, and all configuration files.

  4. 4

    Replace the CompactFlash card with a new Siemens-approved CF card, restore the backup, and re-enable the options.

    Only use Siemens-certified CF cards to ensure compatibility and reliability.

Service Recommended confidence

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