Siemens SINAMICS G120 Error Code F31131

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31131

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

Symptoms

Encoder hardware fault: internal encoder hardware failure.

Possible Causes

  • Encoder internal component failure
  • Encoder board fault
  • Encoder power supply failure

Troubleshooting Steps

  1. Step 1: Check encoder power supply
    Voltage within spec
  2. Step 2: Inspect encoder for physical damage
    No visible damage
  3. Step 3: Replace encoder if faulty
    New encoder operates correctly

How to Reset

Reset via operator panel after encoder replacement.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD