Siemens SINUMERIK codes
Siemens SINUMERIKSpindleIntermediate30-120 minutes

104130

Siemens 840D 104130 - PA: Error on reading number of spindles

PA: Error on reading number of spindles

Siemens SINUMERIK 840D alarm 104130: PA: Error on reading number of spindles. This alarm indicates a fault condition on the specified axis or channel that requires investigation before machining can resume.

Root Cause Summary

Alarm 104130 indicates a failure during machine parameter initialization when the NCK attempts to read the configured number of spindles from machine data. This occurs during system startup or parameter reload when the spindle configuration data is corrupted, missing, or incompatible with the current SINUMERIK firmware version.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Access Siemens SINUMERIK HMI > Diagnosis > Machine Data. Navigate to MD20050 and verify the value is a positive integer between 1 and the maximum supported spindles (typically 8-16 depending on 840D/840D sl version).

    Do not modify MD20050 while spindles are active; request machine stop and control system readiness status.

  2. 2

    If MD20050 is blank or shows 0, enter the correct spindle count. If the value appears corrupted, restore machine data from a known-good backup using NCK backup/restore function in HMI > Service > Backup.

  3. 3

    After correction, perform a cold start: Power cycle the machine control or execute NCK reset via HMI > Service > Reset NCK. Monitor system startup messages in the alarm log.

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