Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

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

Alarm 101638

Siemens 840D 101638 - Write access only in start-up state Drive Configuration (device: p9=3).

This alarm occurs when attempting to modify drive configuration parameters that are write-protected during normal operation mode. The SINUMERIK 840D system restricts certain drive parameters (indicated by p9=3 protection level) to only be writable when the control is in start-up commissioning mode to prevent accidental changes during production.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101638

Siemens 840D 101638 - Write access only in start-up state Drive Configuration (device: p9=3).

Write access only in start-up state Drive Configuration (device: p9=3).

Siemens SINUMERIK operator message 101638: Write access only in start-up state Drive Configuration (device: p9=3). 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 attempting to modify drive configuration parameters that are write-protected during normal operation mode. The SINUMERIK 840D system restricts certain drive parameters (indicated by p9=3 protection level) to only be writable when the control is in start-up commissioning mode to prevent accidental changes during production.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Access HMI Service screen and navigate to Start-up mode (Commissioning > Start-up)

    Ensure machine is in a safe state with all axes stopped before entering start-up mode

  2. 2

    Select 'Drive' or 'Drive Parameter' from the commissioning menu to enter drive start-up mode

  3. 3

    Modify the required drive parameter(s) while in start-up mode

    Document all parameter changes for traceability

  4. 4

    Exit start-up mode, perform a power-on reset (POR) of NCK to activate changes, and verify drive functionality

    A complete NCK restart is required for changes to take effect

Service Recommended confidence

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