Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

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

Alarm 101639

Siemens 840D 101639 - Write access only in start-up state Drive Type Definition (device: p9=2).

This alarm occurs when attempting to modify drive-related parameter p9 (Drive Type Definition) while the system is in an operational state rather than start-up mode. Parameter p9 defines the fundamental drive configuration and can only be changed during system initialization to prevent conflicts with active drive operations.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101639

Siemens 840D 101639 - Write access only in start-up state Drive Type Definition (device: p9=2).

Write access only in start-up state Drive Type Definition (device: p9=2).

Siemens SINUMERIK operator message 101639: Write access only in start-up state Drive Type Definition (device: p9=2). 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-related parameter p9 (Drive Type Definition) while the system is in an operational state rather than start-up mode. Parameter p9 defines the fundamental drive configuration and can only be changed during system initialization to prevent conflicts with active drive operations.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Put the control system into start-up mode by selecting 'Commissioning' mode from the operating area selection menu.

    Ensure all axes are at standstill and no machining operations are active before switching modes.

  2. 2

    Navigate to the drive parameter settings: HMI > Commissioning > Drive > Parameters and locate parameter p9 for the affected drive (device).

  3. 3

    Make the required changes to p9 Drive Type Definition parameter ensuring the value matches your actual hardware configuration.

    Incorrect drive type definition can cause drive malfunction or hardware damage.

  4. 4

    Save the parameters, perform a power-on reset (POR) to activate changes, and return to normal operating mode.

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