SIST EN IEC 61784-3:2021/A1:2024

Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions - Amendment 1 (IEC 61784-3:2021/AMD1:2024)

Industrielle Kommunikationsnetze - Profile - Teil 3: Funktional sichere Übertragung bei Feldbussen - Allgemeine Regeln und Festlegungen für Profile (IEC 61784-3:2021/AMD1:2024)

Amendement 1 - Réseaux de communication industriels - Profils - Partie 3: Bus de terrain de sécurité fonctionnelle - Règles générales et définitions de profils (IEC 61784-3:2021/AMD1:2024)

Industrijska komunikacijska omrežja - Profili - 3. del: Funkciijska varnost procesnih vodil - Splošna pravila in definicije profilov - Dopolnilo 1 (IEC 61784-3:2021/AMD1:2024)

General Information

• Status: Published
• Publication Date: 13-Aug-2024
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.05 - Multilayer applications
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Jun-2024
• Due Date: 09-Aug-2024
• Completion Date: 14-Aug-2024
• Ref Project: EN IEC 61784-3:2021/A1:2024 - Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions

Relations

• Amends: SIST EN IEC 61784-3:2021 - Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions (IEC 61784-3:2021)
• Effective Date: 11-Oct-2022

Overview

EN IEC 61784-3:2021/A1:2024 (IEC 61784-3:2021/AMD1:2024) is an amendment to the Part 3 profile of the IEC 61784 series for industrial communication networks. It focuses on functional safety fieldbuses and updates the general rules and profile definitions for safety-related communication (FSCPs). Key additions include a comprehensive channel model for data integrity calculations (Annex I), new terminology (UDS - uniformly distributed segment), and updates to guidance on safety measures, residual error probability and safety documentation.

Key topics and technical requirements

• Functional safety fieldbus profiles: Defines general rules and profile elements required for safety communication over fieldbuses.
• Comprehensive channel model: Annex I introduces a black-channel data integrity model that extends the Binary Symmetric Channel (BSC) approach to include multiple-bit corruption events and CRC-based error checking - improving analysis of residual error probability for FSCPs.
• Data integrity and CRC: Guidance on using CRC-based error checking and how different channel models affect residual error calculations.
• Error types and countermeasures: Updated Table 1 maps common communication errors (corruption, repetition, sequence errors, loss, delay, insertion, masquerade, addressing issues) to typical safety measures (sequence numbers, timestamps, time expectations, connection authentication, feedback, data integrity assurance, redundancy).
• Safety metrics and calculations: References to PFH and PFDavg calculations and guidance on documenting these in safety manuals.
• Safety manual requirements: New Table 5 lists mandatory topics for safety manuals for products implementing IEC 61784-3-x (safety function description, installation prerequisites, installation guidance, authenticity, configuration/parameterization, electrical safety constraints, security considerations, and safety function response time).
• Terminology and normative references: Adds the term UDS and updates normative references (e.g., IEC 62061:2021) and cross-references to related installation and security standards.

Applications and users

Who uses this standard:

• Safety engineers designing safety communications for process and factory automation
• Device and fieldbus vendors developing safety-capable network interfaces and products
• System integrators implementing functional safety systems over industrial Ethernet and fieldbuses
• Certification bodies assessing conformity of FSCP implementations Practical applications include safety instrumented systems, safety PLC communications, fail-safe I/O networks and any industrial automation application requiring certified safety messaging over shared networks.

Related standards

• IEC 61784 series (profiles)
• IEC 62061 (machine-related functional safety) - updated reference
• IEC 61918 and IEC 61784-5-x (installation guidance)
• IEC 62443 (IACS security) - recommended for security aspects

Keywords: industrial communication networks, functional safety, fieldbus, IEC 61784-3, data integrity, CRC, black channel, FSCP, safety manual, PFH, PFDavg.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2024
Industrijska komunikacijska omrežja - Profili - 3. del: Funkciijska varnost
procesnih vodil - Splošna pravila in definicije profilov - Dopolnilo 1 (IEC 61784-
3:2021/AMD1:2024)
Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses -
General rules and profile definitions - Amendment 1 (IEC 61784-3:2021/AMD1:2024)
Industrielle Kommunikationsnetze - Profile - Teil 3: Funktional sichere Übertragung bei
Feldbussen - Allgemeine Regeln und Festlegungen für Profile (IEC 61784-
3:2021/AMD1:2024)
Amendement 1 - Réseaux de communication industriels - Profils - Partie 3: Bus de
terrain de sécurité fonctionnelle - Règles générales et définitions de profils (IEC 61784-
3:2021/AMD1:2024)
Ta slovenski standard je istoveten z: EN IEC 61784-3:2021/A1:2024
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.05 Večslojne uporabniške Multilayer applications
rešitve
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61784-3:2021/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
ICS 25.040.40; 35.100.05
English Version
Industrial communication networks - Profiles - Part 3: Functional
safety fieldbuses - General rules and profile definitions
(IEC 61784-3:2021/AMD1:2024)
Réseaux de communication industriels - Profils - Partie 3 : Industrielle Kommunikationsnetze - Profile - Teil 3:
Bus de terrain de sécurité fonctionnelle - Règles générales Funktional sichere Übertragung bei Feldbussen -
et définitions de profils Allgemeine Regeln und Festlegungen für Profile
(IEC 61784-3:2021/AMD1:2024) (IEC 61784-3:2021/AMD1:2024)
This amendment A1 modifies the European Standard EN IEC 61784-3:2021; it was approved by CENELEC on 2024-05-24. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the
status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as
the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61784-3:2021/A1:2024 E

European foreword
The text of document 65C/1284/FDIS, future IEC 61784-3/AMD1, prepared by SC 65C "Industrial
networks" of IEC/TC 65 "Industrial-process measurement, control and automation" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61784-3:2021/A1:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-24
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-05-24
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61784-3:2021/AMD1:2024 was approved by CENELEC as
a European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 62061:2021 NOTE Approved as EN IEC 62061:2021 (not modified)

IEC 61784-3 ®
Edition 4.0 2024-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Industrial communication networks – Profiles –
Part 3: Functional safety fieldbuses – General rules and profile definitions
Réseaux de communication industriels – Profils –
Partie 3 : Bus de terrain de sécurité fonctionnelle – Règles générales et
définitions de profils
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40, 35.100.05 ISBN978-2-8322-8279-3
– 2 – IEC 61784-3:2021/AMD1:2024
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 3: Functional safety fieldbuses –
General rules and profile definitions

AMENDMENT 1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 61784-3:2021 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
IEC 61784-3:2021/AMD1:2024 – 3 –
© IEC 2024
The text of this Amendment is based on the following documents:
Draft Report on voting
65C/1284/FDIS 65C/1291/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
A list of all parts of the IEC 61784-3 series, published under the general title Industrial
communication networks – Profiles – Functional safety fieldbuses, can be found on the IEC
website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
_____________
INTRODUCTION to Amendment 1
This Amendment 1 discusses the concepts of a comprehensive channel model for data integrity
calculations for functional safety communications protocols (FSCPs) as specified in
IEC 61784-3:2021. The comprehensive channel model addresses data corruption error types
where multiple contiguous bits are affected by a single fault.
It also reviews typical relationships between the possible errors and the various safety
measures which can be implemented.

– 4 – IEC 61784-3:2021/AMD1:2024
© IEC 2024
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