Siemens SINAMICS G120 Error Code F31120

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31120

Applicable Systems
S7-1200 S7-1500 S7-300 S7-400 LOGO! SINAMICS

Symptoms

Encoder calibration fault: calibration data invalid.

Possible Causes

  • Encoder calibration data corrupt
  • Calibration not performed
  • EEPROM fault in encoder

Troubleshooting Steps

  1. Step 1: Recalibrate encoder
    Calibration successful
  2. Step 2: Verify calibration data
    Data valid
  3. Step 3: Replace encoder if calibration fails
    New encoder calibrates correctly

How to Reset

Reset via operator panel after encoder recalibration.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD

Published: 2026-10-05