301710

Access the NCK parameter menu: Siemens HMI → Diagnosis → Parameters → Machine Data (MD) or use SINUMERIK Operate interface → Customize → Machine Parameters.

Navigate to MD 1022 ($MD_ENC_ABS_RESOL_MOTOR) for the affected axis/drive and verify the current value. Confirm encoder documentation specifies resolution in increments per revolution (typical range 4096 to 65536 for SSI).

Do not proceed with a zero value; this will perpetuate the alarm.

Enter the correct SSI encoder resolution value from the device datasheet into MD 1022. Example: if encoder is 16-bit SSI = 65536 increments/rev.

Save parameters and perform a warm restart (Ctrl+P or HMI Reset) to reload machine data. Verify alarm clears on next axis reference cycle.

Check the backup configuration file or commissioning documentation for the original MD 1022 value. Compare against current NCK parameter value using Siemens parameter comparison tool or HMI read-out.

If no backup exists, retrieve encoder model/serial number from axis nameplate and cross-reference Siemens encoder specification database or device manual for correct resolution value.

Re-enter the correct MD 1022 value and ensure the parameter is saved to non-volatile memory. Use 'Store' or 'Write to EEPROM' function in the NCK parameter interface.

Verify save operation completed without errors before power cycling.

Power-cycle the drive module (not just soft reset) and re-initialize the axis. Confirm alarm 301710 is cleared and encoder communication is re-established in Diagnostics menu.

Physically inspect the SSI encoder mounted on the affected axis/drive. Verify encoder type, resolution bits (8-bit, 16-bit, etc.), and model number match the configuration documentation.

Ensure axis is de-energized and mechanically locked before physical inspection.

If encoder was recently replaced, retrieve the new encoder's specification sheet and calculate resolution: Increments per revolution = 2^(bits) or consult Siemens encoder application guide for SSI resolution calculation.

Update MD 1022 with the correct resolution value for the installed encoder. Verify in related parameters: MD 1024 ($MD_ENC_ABS_OFFSET_MOTOR) is also set correctly if encoder zero-point was adjusted.

Perform SSI encoder communication test via Diagnostics → Measuring Systems or Axis Status to confirm encoder responds. Clear alarm and re-reference axis.