F108-56

Faulty watchdog test

SEW Eurodrive · MOVIDRIVE MDX60B/61B Variable Speed Drive

What does F108-56 mean?

The watchdog test within the DCS..B option failed, indicating faulty feedback from the internal shutdown channel of the digital outputs. This implies a safety-critical monitoring failure.

Common Causes

  • Watchdog timer malfunction or timeout.
  • System not responding to watchdog reset requests.
  • Watchdog hardware failure.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace DCS..B option.

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Verified technical data. Last updated: March 2026

Related Faults

F108-101Internal processing fault PROFIsafeF108-103Internal processing fault PROFIsafeF108-105Internal processing fault PROFIsafe
Source: SEW Eurodrive MOVIDRIVE MDX60B/61B Variable Speed Drive
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