Siemens SINAMICS G120 Error Code F31135

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31135

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

Symptoms

Encoder pulse loss: missing encoder pulses detected.

Possible Causes

  • Encoder disk damage
  • Encoder sensor contamination
  • Signal dropout

Troubleshooting Steps

  1. Step 1: Inspect encoder disk
    Disk clean and undamaged
  2. Step 2: Clean encoder sensor
    Sensor clean
  3. Step 3: Verify pulse count
    Pulse count matches expected

How to Reset

Reset via operator panel after encoder pulse integrity is restored.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD