Siemens SINUMERIK codes
Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

104115

Siemens 840D 104115 - PA: Error on reading JOG feed unit

PA: Error on reading JOG feed unit

Siemens SINUMERIK alarm 104115: PA: Error on reading JOG feed unit. 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 104115 indicates that the control system cannot correctly read or interpret the JOG feedrate unit setting from the machine data or parameter configuration. This typically occurs when the JOG feed unit parameter (MD/SD) contains an invalid value, is corrupted, or is incompatible with the current axis configuration.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Access Commissioning mode and navigate to Machine Data. Check MD11310 $MN_JOG_REV_IS_ACTIVE and channel-specific JOG settings (SD41100-41110 range).

  2. 2

    Verify that JOG feed unit values are set correctly: 0=mm/min or deg/min, 1=mm/rev or deg/rev. Ensure values match the axis type configuration.

    Document current MD values before making changes. Incorrect settings may affect machine behavior.

  3. 3

    If values appear corrupted or out of range, restore from a known good backup or reset to OEM default values for JOG-related machine data.

    Always create a complete backup before restoring machine data.

  4. 4

    Perform a Power ON reset (NCK reset) to reload machine data and verify alarm clears. Test JOG mode operation on all axes.

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