Siemens SINAMICS G120 Error Code F31168

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31168

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

Symptoms

Encoder startup fault: encoder failed during startup sequence.

Possible Causes

  • Encoder not ready at startup
  • Encoder initialization timeout
  • Encoder power-up fault

Troubleshooting Steps

  1. Step 1: Check encoder power supply at startup
    Voltage within spec at power-on
  2. Step 2: Verify encoder startup sequence
    Sequence completes
  3. Step 3: Replace encoder if startup fails
    New encoder starts correctly

How to Reset

Reset via operator panel after encoder startup is successful.

Related Siemens Fault Codes

Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD