IEC 62439-3:2021 PRV 
Pre release version

Industrial communication networks - High availability automation networks - Part 3: Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR)


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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: 2021-10-08 to 2021-11-19. By purchasing this FDIS now, you will automatically receive, in addition, the final publication.

IEC 62439-3:2021 The IEC 62439 series is applicable to high-availability automation networks based on the Ethernet technology.
The IEC 62439-3:2021 (EN) document:
• specifies PRP and HSR as two related redundancy protocols designed to provide seamless recovery in case of single failure of an inter-bridge link or bridge in the network, which are based on the same scheme: parallel transmission of duplicated information;
• specifies the operation of the precision time protocol (PTP) in networks that implement the two redundancy protocols (Annex A);
• specifies PTP profiles with performance suitable for power utilty automation (Annex B) and industrial automation (Annex C);
• includes for better understanding a tutorial (Annex D) on the PTP features effectively used in high-availability automation networks;
• includes a management information base for PTP (Annex E);
• defines a conformance test suite for the above protocols (Annex F).

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Additional information

Publication typeInternational Standard
Publication date2021-10-08
Available language(s)English
TC/SCTC 65/SC 65C - Industrial networksrss
ICS25.040.40 - Industrial process measurement and control
35.100.05 - Multilayer applications
Stability date  2025
File size13746 KB

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