F108-105

Internal processing fault PROFIsafe

SEW Eurodrive · MOVIDRIVE MDX60B/61B Variable Speed Drive

What does F108-105 mean?

An internal processing fault occurred related to the PROFIsafe functionality within the DCS..B option. This indicates a problem with the safety communication protocol or its implementation.

Common Causes

  • PROFIsafe internal state machine malfunction.
  • Failed safety integrity level (SIL) check during PROFIsafe operation.
  • Loss of synchronization with the PROFIsafe master.

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 PROFIsafeF108-107Fault during internal data transmission
Source: SEW Eurodrive MOVIDRIVE MDX60B/61B Variable Speed Drive
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