F31885 Cyclic Data Transfer Fault in Siemens SINAMICS S120 Drive

F31885 Cyclic Data Transfer Error in the Siemens SINAMICS S120 Drive indicates that a DRIVE-CLiQ communication error has occurred between the Sensor Module (Encoder 1) and the Control Unit (CU). The cyclic data exchange between the devices is no longer synchronized, preventing reliable communication of encoder feedback and control data.

F31885 Cyclic Data Transfer Fault in Siemens SINAMICS S120 Drive


This fault generally indicates a problem with the DRIVE-CLiQ communication network, Sensor Module, power supply, or Control Unit, rather than the motor or power module.

Possible Causes

  • DRIVE-CLiQ communication error.
  • Sensor Module (Encoder 1) communication failure.
  • Sign-of-life bit not set.
  • Telegram received too early.
  • Cyclic telegram not received.
  • Timeout in the DRIVE-CLiQ send/receive list.
  • Power supply voltage to the affected component is missing or unstable.
  • Faulty DRIVE-CLiQ cable or connector.
  • Defective Sensor Module.
  • Defective Control Unit (CU).
  • Internal DRIVE-CLiQ network hardware fault.

Solutions

  1. Check the power supply voltage of the affected component.
  2. Perform a POWER ON (power off/on) of the drive system.
  3. Inspect the DRIVE-CLiQ cable and connectors for loose or damaged connections.
  4. Verify proper communication between the Sensor Module and the Control Unit.
  5. Replace the affected component if the fault persists.
  6. Check Parameter p9915 – DRIVE-CLiQ data transfer error shutdown threshold (master) for additional diagnostics.
  7. Reset the fault and verify normal operation.

Additional Information

The DRIVE-CLiQ interface is Siemens' high-speed communication system used for cyclic data exchange between the Control Unit, Sensor Modules, and other drive components.

Fault F31885 is generated when the cyclic communication between the Sensor Module and the Control Unit becomes unsynchronized.

According to Siemens, possible communication errors include:

  • Sign-of-life bit not set.
  • Telegram received too early.
  • Cyclic telegram not received.
  • Timeout in the send/receive list.

The recommended corrective actions are to:

  • Check the component power supply voltage.
  • Perform a complete POWER ON.
  • Replace the affected component if necessary.
  • Refer to Parameter p9915 for the DRIVE-CLiQ data transfer error shutdown threshold.

Unlike an encoder hardware fault, F31885 specifically indicates a DRIVE-CLiQ cyclic communication fault.

Common Symptoms

  • Drive displays F31885 Cyclic Data Transfer Error.
  • Encoder feedback is lost or intermittent.
  • Closed-loop motor control is unavailable.
  • Drive trips during startup or operation.
  • Motion control performance is degraded.
  • Communication diagnostics report DRIVE-CLiQ errors.
  • Drive remains inhibited until communication is restored.
  • Fault may recur after reset if the communication issue persists.
  • Machine operation is interrupted.
  • Encoder-related functions become unavailable.

Recommended Troubleshooting Sequence

  1. Verify that the fault is F31885 Cyclic Data Transfer Error.
  2. Disconnect power and follow lockout/tagout procedures if maintenance is required.
  3. Check the power supply voltage of the affected Sensor Module.
  4. Inspect the DRIVE-CLiQ cable and connectors for damage or loose connections.
  5. Verify secure connections at both the Sensor Module and the Control Unit.
  6. Perform a complete POWER ON of the drive system.
  7. Test the Sensor Module for correct operation.
  8. Replace the faulty component if necessary.
  9. Review Parameter p9915 if repeated communication shutdowns occur.
  10. Restore power and verify stable DRIVE-CLiQ communication.

F31885 Cyclic Data Transfer Error Check Table

Check PointAction
Component power supplyVerify correct supply voltage
DRIVE-CLiQ cableInspect for damage or loose connections
DRIVE-CLiQ connectorsEnsure secure connections
Sensor ModuleTest and replace if faulty
Control Unit (CU)Inspect if communication fault persists
POWER ONPerform a complete power cycle
Parameter p9915Check DRIVE-CLiQ data transfer error shutdown threshold
Communication statusVerify normal cyclic data exchange

Preventive Maintenance Tips

  • Inspect DRIVE-CLiQ cables and connectors regularly.
  • Keep communication connectors clean and securely fastened.
  • Verify stable power supplies to the Sensor Module and Control Unit.
  • Protect DRIVE-CLiQ cables from vibration, bending, and mechanical damage.
  • Route communication cables separately from high-power cables to reduce electrical interference.
  • Replace damaged DRIVE-CLiQ cables immediately.
  • Record recurring F31885 faults to identify intermittent communication problems.
  • Perform periodic inspections of Sensor Modules and the Control Unit.
  • Verify parameter settings after replacing communication components.
  • Follow Siemens preventive maintenance recommendations for the SINAMICS S120 DRIVE-CLiQ system.

Proper inspection of the Sensor Module, DRIVE-CLiQ communication cable, power supply, Control Unit, and Parameter p9915 will help prevent recurring F31885 Cyclic Data Transfer Error faults in Siemens SINAMICS S120 drives, ensuring reliable communication, accurate encoder feedback, stable motion control, and long-term system performance.

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