IEC 61139-2:2022 PRV 
Pre release version

Industrial networks - Single-drop digital communication interface - Part 2: Functional safety extensions


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This Final Draft International Standard is an up to 6 weeks' pre-release of the official publication. It is available for sale during its voting period: 2022-04-22 to 2022-06-03. By purchasing this FDIS now, you will automatically receive, in addition, the final publication.

IEC 61139-2:2022(E) specifies the extensions to SDCI in IEC 61131-9 for functional safety. This comprises:
• a standardized OSSDe interface for redundant switching signals based on IEC 61131-2,
• minor modifications/extensions to state machines of SDCI to support the safety operations,
• a lean functional safety communication protocol on top of the standard SDCI communication which is a black channel according to IEC 61784-3:2021,
• protocol management functions for configuration, parameterization, and commissioning,
• IODD extensions for functional safety,
• a Device tool interface to support Dedicated Tools according to functional safety standards.
This document does not cover:
• communication interfaces or systems including multi-point or multi-drop linkages,
• communication interfaces or systems including multi-channel or encrypted linkages,
• wireless communication interfaces or systems,
• integration of SDCI-FS into upper-level systems such as fieldbuses/FSCPs.

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Additional information

Publication typeInternational Standard
Publication date2022-04-22
Available language(s)English
TC/SCTC 65/SC 65C - Industrial networksrss
ICS25.040 - Industrial automation systems
Stability date  2025
File size7757 KB

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