IEC 62439-3-2021 cor1-2023 PDF

Full title and description

IEC 62439-3:2021/COR1:2023 — Corrigendum 1 to "Industrial communication networks - High availability automation networks - Part 3: Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR)". The corrigendum issues editorial and technical corrections to the 2021 fourth edition of Part 3 to clarify protocol text and correct minor errors identified after publication.

Abstract

This corrigendum provides corrections and clarifications to the wording, figures and normative references in IEC 62439-3:2021 (edition 4.0) so that the specification for PRP and HSR remains consistent and unambiguous for implementers and certification bodies. It does not introduce new normative functionality but refines existing protocol descriptions and fixes errata discovered since the 2021 edition.

General information

• Status: Published.
• Publication date: April 21, 2023 (Corrigendum 1 to IEC 62439-3:2021).
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 25.040.40 (Industrial process measurement and control); 35.100.05 (Multilayer applications).
• Edition / version: Edition 4.0, Corrigendum 1 (IEC 62439-3:2021/COR1:2023).
• Number of pages: 17 (bilingual PDF: English/French).

Key bibliographic and publication details are taken from the IEC publication record for the corrigendum.

Scope

This document is a corrigendum to Part 3 of the IEC 62439 series and applies to the Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR) protocol definitions, node behaviours and normative requirements published in IEC 62439-3:2021. The corrigendum corrects editorial errors, clarifies ambiguous wording and updates normative references and figures so that implementers of PRP and HSR have a consistent interpretation of the standard.

Key topics and requirements

• Clarifications to PRP operation and duplicate-frame handling to ensure interoperable duplicate suppression and sequence handling across doubly-attached nodes and RedBoxes.
• Corrections and clarifications to HSR frame forwarding and node behaviour on ring topologies (single-failure seamless recovery semantics).
• Editorial fixes to normative references, figures and protocol state descriptions that affect implementation detail and test interpretation.
• Stated intent: no new functional extensions; corrections preserve the original protocol goals of zero-time switchover and deterministic redundancy behaviour.

Typical use and users

IEC 62439-3 and this corrigendum are used by industrial automation vendors, network equipment manufacturers, system integrators, power utility and substation automation engineers, railway and transport networking teams, and testing/certification bodies that implement or verify PRP and HSR for high-availability Ethernet-based systems. The corrigendum helps these users resolve ambiguous interpretations and maintain interoperability.

Related standards

IEC 62439 is a multipart series; related documents include IEC 62439-1 (general concepts and calculation methods) and IEC 62439-2 (Media Redundancy Protocol, MRP). Corrigenda have been issued for other parts of the series as needed to keep the set consistent. Implementers should consult the other parts of IEC 62439 and any national adoptions or amendments when applying PRP/HSR in a given regulatory/market context.

Keywords

PRP, HSR, high-availability, redundancy, industrial Ethernet, IEC 62439, corrigendum, seamless redundancy, Parallel Redundancy Protocol, High-availability Seamless Redundancy.

FAQ

Q: What is this standard?

A: This item is Corrigendum 1 to IEC 62439-3:2021 — a published correction document that amends and clarifies the Part 3 text covering PRP and HSR.

Q: What does it cover?

A: It covers editorial and technical corrections to the 2021 edition of IEC 62439-3, clarifying protocol behaviour, figures and normative references for PRP and HSR implementations. It does not add new protocol features.

Q: Who typically uses it?

A: Network equipment vendors, automation system integrators, power and transport communication engineers, and testing/certification bodies that implement or validate PRP and HSR for high-availability Ethernet networks.

Q: Is it current or superseded?

A: The corrigendum was published in April 2023 and is a current published correction to IEC 62439-3:2021; users should apply the corrigendum together with the 2021 edition (edition 4.0) when implementing the standard. For national adoptions or later amendments check the relevant national or regional publication records.

Q: Is it part of a series?

A: Yes — IEC 62439 is a multipart standard on high-availability automation networks (parts include general concepts in Part 1, MRP in Part 2, PRP/HSR in Part 3, etc.). The corrigendum applies specifically to Part 3 of that series.

Q: What are the key keywords?

A: PRP, HSR, redundancy, industrial Ethernet, high availability, corrigendum, IEC 62439.