Siemens SINAMICS V90 Error Code F1912

Siemens PLC & VFD Major Communication

Model: SINAMICS V90 | Code: F1912

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

Symptoms

PROFIdrive clock synchronization failed. The V90 has detected a failure in the PROFIdrive clock synchronization mechanism used for real-time motion control.

Possible Causes

  • PROFINET IRT (Isochronous Real-Time) communication not properly configured
  • Clock synchronization timeout (PLC not providing clock sync)
  • PROFINET switch does not support IRT mode
  • Communication cycle time mismatch between PLC and V90

Troubleshooting Steps

  1. Step 1: Verify the PROFINET switch supports IRT (Isochronous Real-Time) mode
    Switch is IRT-capable; IRT mode is active
  2. Step 2: Check the PROFINET IRT configuration in TIA Portal
    IRT is enabled; sync domain is correctly configured
  3. Step 3: Verify communication cycle time matches between PLC and V90
    Cycle time is consistent on both sides (typically 1-4ms)
  4. Step 4: If configuration is correct, check for cable issues affecting IRT timing
    Cable is shielded; length within IRT limits (typically 100m)

How to Reset

1) Verify IRT switch. 2) Check TIA Portal IRT config. 3) Verify cycle time. 4) Check cable. 5) Reset fault.

Frequently Asked Questions

  • Q: What is PROFIdrive clock synchronization?

    PROFIdrive with IRT (Isochronous Real-Time) uses clock synchronization to ensure the drive and PLC exchange data at precisely timed intervals, essential for coordinated multi-axis motion control.

  • Q: Do I need IRT for all V90 applications?

    No. IRT is only needed for high-precision coordinated motion (e.g., multi-axis interpolation, electronic gearing). Standard positioning can use RT (Real-Time) without clock sync.

Related Siemens Fault Codes

Source: Siemens SINAMICS V90 Operating Instructions, Edition 01/2023

Category: PLC & VFD