Siemens SINAMICS G120 Error Code F01620

Siemens PLC & VFD Critical Safety

Model: SINAMICS G120 | Code: F01620

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

Symptoms

Safe Torque Off (STO) safety function is active.

Possible Causes

  • STO input activated
  • Safety command received
  • Emergency stop circuit triggered

Troubleshooting Steps

  1. Step 1: Check STO input signal
    STO input inactive when safe
  2. Step 2: Verify emergency stop circuit
    Circuit normal
  3. Step 3: Clear STO command
    Command cleared

How to Reset

Reset by clearing STO command and acknowledging fault.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD