Timeout of communication

Timeout of communication (RS-485)

SEW Eurodrive · MOVIMOT Field Distributor

What does Timeout of communication mean?

Communication timeout occurred between the MOVIMOT unit and the RS-485 master, causing the motor to stop without generating a specific error code. This indicates a disruption in the data link.

Common Causes

  • Missing physical connection (ground, RS+, RS-) between MOVIMOT and RS-485 master.
  • Electromagnetic interference (EMC) affecting the data cables.
  • Incorrect protocol type (cyclical) where the time between individual telegrams exceeds 1 second.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the physical connection, especially the ground, RS+, and RS- terminals, between the MOVIMOT and the RS-485 master and repair any identified issues.

  2. 2

    Inspect the shielding of the data cables and improve it if necessary to mitigate EM interference.

  3. 3

    Shorten the telegram cycle time or select the "acyclical" protocol type if using a cyclical protocol with a cycle time exceeding 1 second.

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Verified technical data. Last updated: March 2026

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Source: SEW Eurodrive MOVIMOT Field Distributor