SIST EN IEC 61784-3:2021
(Main)Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions (IEC 61784-3:2021)
Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions (IEC 61784-3:2021)
IEC 61784-3:2021 explains some common principles that can be used in the transmission of safety-relevant messages among participants within a distributed network which use fieldbus technology in accordance with the requirements of IEC 61508 (all parts) for functional safety. These principles are based on the black channel approach. They can be used in various industrial applications such as process control, manufacturing automation and machinery.
Industrielle Kommunikationsnetze - Profile - Teil 3: Funktional sichere Übertragung bei Feldbussen - Allgemeine Regeln und Festlegungen für Profile (IEC 61784-3:2021)
Réseaux de communication industriels - Profils - Partie 3: Bus de terrain de sécurité fonctionnelle - Règles générales et définitions de profils (IEC 61784-3:2021)
L'IEC 61784-3:2021 définit des principes communs qui peuvent être appliqués pour la transmission des messages relatifs à la sécurité entre les participants d'un réseau réparti, à l'aide de la technologie de bus de terrain conformément aux exigences de l'IEC 61508 (toutes les parties) sur la sécurité fonctionnelle. Ces principes s'appuient sur le principe de canal noir. Ils peuvent être utilisés dans différentes applications industrielles, par exemple la commande de processus, l'usinage automatique et les machines.
Industrijska komunikacijska omrežja - Profili - 3. del: Funkciijska varnost procesnih vodil - Splošna pravila in definicije profilov (IEC 61784-3:2021)
Ta del skupine standardov IEC 61784-3 pojasnjuje nekatera splošna načela, ki jih je mogoče uporabiti pri prenosu z vidika varnosti pomembnih sporočil med udeleženci v porazdeljenem omrežju z uporabo tehnologije procesnih vodil v skladu z zahtevami skupine standardov IEC 61508 (vsi deli) 1 za funkcijsko varnost. Ta načela temeljijo na pristopu »black channel«. Uporabljati jih je mogoče za različne industrijske namene, kot so procesni nadzor, proizvodna avtomatizacija in stroji.
Ta del in deli skupine standardov IEC 61784-3-x določajo več komunikacijskih profilov za funkcionalno varnost, ki temeljijo na komunikacijskih profilih, ter protokolne plasti tehnologije procesnih vodil v skupinah standardov IEC 61784-1, IEC 61784-2 in IEC 61158 (vsi deli). Ti komunikacijski profili za funkcionalno varnost uporabljajo pristop »black channel«, kot je opredeljeno v skupini standardov IEC 61508. Namenjeni so izključno za uporabo v varnostnih napravah.
OPOMBA 1: Morda obstajajo drugi z varnostjo povezani komunikacijski sistemi, ki izpolnjujejo zahteve skupine standardov IEC 61508 (vsi deli), ki niso vključeni v skupino standardov IEC 61784-3 (vsi deli).
OPOMBA 2: Standard ne zajema električne varnosti in intrinzičnih varnostnih vidikov. Električna varnost je povezana z nevarnostmi, kot je električni udar. Intrinzična varnost se navezuje na nevarnosti, ki so povezane s potencialno eksplozivnimi atmosferami.
Vsi sistemi so na neki točki svojega življenjskega cikla izpostavljeni nepooblaščenemu dostopu. Treba je preučiti dodatne ukrepe pri vseh z varnostjo povezanih vrstah uporabe za zaščito sistemov procesnih vodil pred nepooblaščenim dostopom. Skupina standardov IEC 62443 (vsi deli) bo obravnavala številna od teh vprašanj; povezava s skupino standardov IEC 62443 (vsi deli) je podrobno opisana v namenski podtočki tega dokumenta.
OPOMBA 3: Izvedba komunikacijskega profila za funkcionalno varnost v napravi v skladu s tem dokumentom ne zadostuje, da bi naprava izpolnjevala zahteve za varnostno napravo, kot je opredeljeno v skupini standardov IEC 61508 (vsi deli).
OPOMBA 4: Posledična celovitost varnostnega sistema (SIL) je odvisna od izvedbe izbranega komunikacijskega profila za funkcionalno varnost znotraj tega sistema.
OPOMBA 5: V dodatku C je pojasnjena shema številčenja, ki se uporablja za tehnološko specifične dele (IEC 61784-3-x), skupaj z njihovo skupno splošno strukturo.
OPOMBA 6: V dodatku D so podane smernice za ocenjevanje in preskušanje varnostnih komunikacijskih profilov ter z varnostjo povezane naprave, ki te profile uporabljajo.
General Information
- Status
- Published
- Public Enquiry End Date
- 12-Apr-2020
- Publication Date
- 25-May-2021
- Technical Committee
- MOV - Measuring equipment for electromagnetic quantities
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 31-Mar-2021
- Due Date
- 05-Jun-2021
- Completion Date
- 26-May-2021
Relations
- Effective Date
- 30-Mar-2021
- Effective Date
- 30-Mar-2021
- Effective Date
- 11-Oct-2022
Overview
EN IEC 61784-3:2021 - "Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses" defines general rules and profile definitions for transmitting safety‑relevant messages over fieldbus networks in accordance with the functional safety requirements of IEC 61508. The standard explains common principles, based on the black channel approach, for end‑to‑end protection of safety data across distributed networks using IEC 61158 fieldbuses. It applies to industrial sectors such as process control, manufacturing automation and machinery where reliable safety communication is required.
Key topics
- Black channel approach: principles for treating the communication channel as an untrusted (black) medium while providing safety at the end points.
- Safety function decomposition and mapping of safety responsibilities across devices and communication.
- Types of communication errors covered (e.g., corruption, loss, unintended repetition, insertion, incorrect sequence, masquerade, unacceptable delay).
- Deterministic remedial measures and mechanisms to detect and mitigate communication faults:
- sequence numbers, timestamps, time expectation
- connection authentication and feedback messages
- data integrity assurance (end‑to‑end checks), redundancy and cross‑checking
- Communication system aspects: IEC 61158 fieldbus considerations, communication channel types and safety function response time.
- Conformance and implementation: terms, definitions, symbols, and conformance rules for Functional Safety Communication Profiles (FSCP).
- Profile family (CPF) structure: references to additional CPF-specific parts (e.g., IEC 61784‑3‑1, -3‑2, -3‑3, -3‑6, -3‑8, -3‑12, -3‑13, -3‑14, -3‑17, -3‑18) that define CPF‑level specifications.
Applications
EN IEC 61784-3:2021 is essential where safety functions depend on networked communication:
- Process industries (DCS, safety instrumented systems)
- Manufacturing automation (robotics, safety I/O)
- Machinery safety networks (safety PLCs, distributed drives) It helps designers, system integrators and functional safety engineers specify, assess and implement safe fieldbus communication for SIL-oriented architectures.
Who should use this standard
- Functional safety engineers and system architects
- Control system and network designers
- Equipment manufacturers and vendors of safety devices
- Certification and testing bodies assessing fieldbus safety compliance
Related standards
- IEC 61508 (functional safety)
- IEC 61158 (fieldbus specifications)
- IEC 61784‑1/‑2/‑5 (fieldbus profiles and installation)
- IEC 61326 / IEC 61000 series (EMC for functional safety)
- IEC 62443 (industrial network security)
EN IEC 61784-3:2021 provides the framework to design, validate and document safe communications over fieldbuses - a must‑reference for anyone implementing safety‑critical distributed control systems.
Frequently Asked Questions
SIST EN IEC 61784-3:2021 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions (IEC 61784-3:2021)". This standard covers: IEC 61784-3:2021 explains some common principles that can be used in the transmission of safety-relevant messages among participants within a distributed network which use fieldbus technology in accordance with the requirements of IEC 61508 (all parts) for functional safety. These principles are based on the black channel approach. They can be used in various industrial applications such as process control, manufacturing automation and machinery.
IEC 61784-3:2021 explains some common principles that can be used in the transmission of safety-relevant messages among participants within a distributed network which use fieldbus technology in accordance with the requirements of IEC 61508 (all parts) for functional safety. These principles are based on the black channel approach. They can be used in various industrial applications such as process control, manufacturing automation and machinery.
SIST EN IEC 61784-3:2021 is classified under the following ICS (International Classification for Standards) categories: 25.040.40 - Industrial process measurement and control; 35.100.05 - Multilayer applications. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 61784-3:2021 has the following relationships with other standards: It is inter standard links to SIST EN 61784-3:2017, SIST EN 61784-3:2017/A1:2018, SIST EN IEC 61784-3:2021/A1:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN IEC 61784-3:2021 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2021
Nadomešča:
SIST EN 61784-3:2017
SIST EN 61784-3:2017/A1:2018
Industrijska komunikacijska omrežja - Profili - 3. del: Funkciijska varnost
procesnih vodil - Splošna pravila in definicije profilov (IEC 61784-3:2021)
Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses -
General rules and profile definitions (IEC 61784-3:2021)
Industrielle Kommunikationsnetze - Profile - Teil 3: Funktional sichere Übertragung bei
Feldbussen - Allgemeine Regeln und Festlegungen für Profile (IEC 61784-3:2021)
Réseaux de communication industriels - Profils - Partie 3: Bus de terrain de sécurité
fonctionnelle - Règles générales et définitions de profils (IEC 61784-3:2021)
Ta slovenski standard je istoveten z: EN IEC 61784-3:2021
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
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2021
ICS 25.040.40; 35.100.05 Supersedes EN 61784-3:2016 and all of its amendments
and corrigenda (if any)
English Version
Industrial communication networks - Profiles - Part 3: Functional
safety fieldbuses - General rules and profile definitions
(IEC 61784-3:2021)
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) (IEC 61784-3:2021)
This European Standard was approved by CENELEC on 2021-03-23. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard 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 European Standard 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,
Turkey 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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61784-3:2021 E
European foreword
The text of document 65C/1067/FDIS, future edition 4 of IEC 61784-3, 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.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-12-23
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-03-23
document have to be withdrawn
This document supersedes EN 61784-3:2016 and all of its amendments and corrigenda (if any).
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.
Endorsement notice
The text of the International Standard IEC 61784-3:2021 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 61000-1-2 NOTE Harmonized as EN 61000-1-2
IEC 61131-6 NOTE Harmonized as EN 61131-6
IEC 61158-2:2014 NOTE Harmonized as EN 61158-2:2014 (not modified)
IEC 61158-3-1 NOTE Harmonized as EN 61158-3-1
IEC 61158-3-2 NOTE Harmonized as EN 61158-3-2
IEC 61158-3-3 NOTE Harmonized as EN 61158-3-3
IEC 61158-3-8 NOTE Harmonized as EN 61158-3-8
IEC 61158-3-12 NOTE Harmonized as EN IEC 61158-3-12
IEC 61158-3-13 NOTE Harmonized as EN 61158-3-13
IEC 61158-3-14 NOTE Harmonized as EN 61158-3-14
IEC 61158-3-18 NOTE Harmonized as EN 61158-3-18
IEC 61158-3-19 NOTE Harmonized as EN IEC 61158-3-19
IEC 61158-3-21 NOTE Harmonized as EN IEC 61158-3-21
IEC 61158-3-22 NOTE Harmonized as EN 61158-3-22
IEC 61158-4-1 NOTE Harmonized as EN 61158-4-1
IEC 61158-4-2 NOTE Harmonized as EN IEC 61158-4-2
IEC 61158-4-3 NOTE Harmonized as EN IEC 61158-4-3
IEC 61158-4-8 NOTE Harmonized as EN 61158-4-8
IEC 61158-4-12 NOTE Harmonized as EN IEC 61158-4-12
IEC 61158-4-13 NOTE Harmonized as EN 61158-4-13
IEC 61158-4-14 NOTE Harmonized as EN 61158-4-14
IEC 61158-4-18 NOTE Harmonized as EN 61158-4-18
IEC 61158-4-19 NOTE Harmonized as EN IEC 61158-4-19
IEC 61158-4-21 NOTE Harmonized as EN IEC 61158-4-21
IEC 61158-4-22 NOTE Harmonized as EN 61158-4-22
IEC 61158-5-2 NOTE Harmonized as EN IEC 61158-5-2
IEC 61158-5-3 NOTE Harmonized as EN 61158-5-3
IEC 61158-5-5 NOTE Harmonized as EN 61158-5-5
IEC 61158-5-8 NOTE Harmonized as EN 61158-5-8
IEC 61158-5-9 NOTE Harmonized as EN 61158-5-9
IEC 61158-5-10 NOTE Harmonized as EN IEC 61158-5-10
IEC 61158-5-12 NOTE Harmonized as EN IEC 61158-5-12
IEC 61158-5-13 NOTE Harmonized as EN 61158-5-13
IEC 61158-5-14 NOTE Harmonized as EN 61158-5-14
IEC 61158-5-18 NOTE Harmonized as EN 61158-5-18
IEC 61158-5-19 NOTE Harmonized as EN IEC 61158-5-19
IEC 61158-5-21 NOTE Harmonized as EN IEC 61158-5-21
IEC 61158-5-22 NOTE Harmonized as EN 61158-5-22
IEC 61158-5-23 NOTE Harmonized as EN IEC 61158-5-23
IEC 61158-6-2 NOTE Harmonized as EN IEC 61158-6-2
IEC 61158-6-3 NOTE Harmonized as EN IEC 61158-6-3
IEC 61158-6-5 NOTE Harmonized as EN 61158-6-5
IEC 61158-6-8 NOTE Harmonized as EN 61158-6-8
IEC 61158-6-9 NOTE Harmonized as EN 61158-6-9
IEC 61158-6-10 NOTE Harmonized as EN IEC 61158-6-10
IEC 61158-6-12 NOTE Harmonized as EN IEC 61158-6-12
IEC 61158-6-13 NOTE Harmonized as EN 61158-6-13
IEC 61158-6-14 NOTE Harmonized as EN 61158-6-14
IEC 61158-6-18 NOTE Harmonized as EN 61158-6-18
IEC 61158-6-19 NOTE Harmonized as EN IEC 61158-6-19
IEC 61158-6-21 NOTE Harmonized as EN IEC 61158-6-21
IEC 61158-6-22 NOTE Harmonized as EN 61158-6-22
IEC 61158-6-23 NOTE Harmonized as EN IEC 61158-6-23
IEC 61496 (series) NOTE Harmonized as EN IEC 61496 (series)
IEC 61496-1 NOTE Harmonized as EN IEC 61496-1
IEC 61508-4:2010 NOTE Harmonized as EN 61508-4:2010 (not modified)
IEC 61508-5:2010 NOTE Harmonized as EN 61508-5:2010 (not modified)
IEC 61511 (series) NOTE Harmonized as EN 61511 (series)
IEC 61800-5-2 NOTE Harmonized as EN 61800-5-2
IEC 62061:2005 NOTE Harmonized as EN 62061:2005 (not modified)
IEC 62061:2005/A1:2012 NOTE Harmonized as EN 62061:2005/A1:2013 (not modified)
IEC 62061:2005/A2:2015 NOTE Harmonized as EN 62061:2005/A2:2015 (not modified)
ISO 10218-1 NOTE Harmonized as EN ISO 10218-1
ISO 13849 (series) NOTE Harmonized as EN ISO 13849 (series)
ISO 13849-1:2015 NOTE Harmonized as EN ISO 13849-1:2015 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61000-6-7 - Electromagnetic compatibility (EMC) - Part EN 61000-6-7 -
6-7: Generic standards - Immunity
requirements for equipment intended to
perform functions in a safety-related system
(functional safety) in industrial locations
IEC 61010-2-201 - Safety requirements for electrical equipment EN IEC 61010-2-201 -
for measurement, control, and laboratory
use - Part 2-201: Particular requirements for
control equipment
IEC 61158 series Industrial communication networks - EN IEC 61158 series
Fieldbus specifications
IEC 61326-3-1 - Electrical equipment for measurement, EN 61326-3-1 -
control and laboratory use - EMC
requirements – Part 3-1: Immunity
requirements for safety-related systems and
for equipment intended to perform safety-
related functions (functional safety) –
General industrial applications
IEC 61326-3-2 - Electrical equipment for measurement, EN IEC 61326-3-2 -
control and laboratory use - EMC
requirements - Part 3-2: Immunity
requirements for safety-related systems and
for equipment intended to perform safety-
related functions (functional safety) -
Industrial applications with specified
electromagnetic environment
IEC 61508 series Functional safety of electrical EN 61508 series
/electronic/programmable electronic safety-
related systems
Publication Year Title EN/HD Year
IEC 61508-1 2010 Functional safety of electrical EN 61508-1 2010
/electronic/programmable electronic safety-
related systems - Part 1: General
requirements
IEC 61508-2 - Functional safety of electrical/ EN 61508-2 -
electronic/programmable electronic safety-
related systems - Part 2: Requirements for
electrical/electronic/programmable
electronic safety-related systems
IEC 61784-1 - Industrial communication networks - Profiles EN IEC 61784-1 -
Part 1: Fieldbus profiles
IEC 61784-2 - Industrial communication networks - Profiles EN IEC 61784-2 -
- Part 2: Additional fieldbus profiles for real-
time networks based on ISO/IEC/IEEE
8802-3
IEC 61784-3 series Industrial communication networks - Profiles - -
- Part 3: Functional safety fieldbuses
IEC 61784-3-1 - Industrial communication networks - Profiles EN 61784-3-1 -
- Part 3-1: Functional safety fieldbuses -
Additional specifications for CPF 1
IEC 61784-3-2 - Industrial communication networks - Profiles EN 61784-3-2 -
- Part 3-2: Functional safety fieldbuses -
Additional specifications for CPF 2
IEC 61784-3-3 - Industrial communication networks - Profiles EN 61784-3-3 -
- Part 3-3: Functional safety fieldbuses -
Additional specifications for CPF 3
IEC 61784-3-6 - Industrial communication networks - Profiles EN 61784-3-6 -
- Part 3-6: Functional safety fieldbuses -
Additional specifications for CPF 6
IEC 61784-3-8 - Industrial communication networks - Profiles EN 61784-3-8 -
- Part 3-8: Functional safety fieldbuses -
Additional specifications for CPF 8
IEC 61784-3-12 - Industrial communication networks - Profiles EN 61784-3-12 -
- Part 3-12: Functional safety fieldbuses -
Additional specifications for CPF 12
IEC 61784-3-13 - Industrial communication networks - Profiles EN 61784-3-13 -
- Part 3-13: Functional safety fieldbuses -
Additional specifications for CPF 13
IEC 61784-3-14 - Industrial communication networks - Profiles EN 61784-3-14 -
- Part 3-14: Functional safety fieldbuses -
Additional specifications for CPF 14
Publication Year Title EN/HD Year
IEC 61784-3-17 - Industrial communication networks - Profiles EN 61784-3-17 -
- Part 3-17: Functional safety fieldbuses -
Additional specifications for CPF 17
IEC 61784-3-18 - Industrial communication networks - Profiles EN 61784-3-18 -
- Part 3-18: Functional safety fieldbuses -
Additional specifications for CPF 18
IEC 61784-5 series Industrial communication networks - Profiles EN 61784-5 series
- Part 5: Installation of fieldbuses
IEC 61918 2018 Industrial communication networks - EN IEC 61918 2018
Installation of communication networks in
industrial premises
- - EN IEC 61918:2018 2019
/AC:2019-03
IEC 62443 series Security for industrial process measurement - -
and control - Network and system security
IEC 61784-3 ®
Edition 4.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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 ISBN 978-2-8322-9268-6
– 2 – IEC 61784-3:2021 © IEC 2021
CONTENTS
FOREWORD . 7
0 Introduction . 9
0.1 General . 9
0.2 Use of extended assessment methods in Edition 4 . 11
0.3 Patent declaration . 11
1 Scope . 12
2 Normative references . 12
3 Terms, definitions, symbols, abbreviated terms and conventions . 14
3.1 Terms and definitions . 14
3.2 Symbols and abbreviated terms . 21
3.2.1 Abbreviated terms . 21
3.2.2 Symbols . 22
4 Conformance . 22
5 Basics of safety-related fieldbus systems . 23
5.1 Safety function decomposition . 23
5.2 Communication system . 23
5.2.1 General . 23
5.2.2 IEC 61158 fieldbuses . 24
5.2.3 Communication channel types . 24
5.2.4 Safety function response time . 25
5.3 Communication errors . 25
5.3.1 General . 25
5.3.2 Corruption . 25
5.3.3 Unintended repetition . 26
5.3.4 Incorrect sequence . 26
5.3.5 Loss . 26
5.3.6 Unacceptable delay . 26
5.3.7 Insertion . 26
5.3.8 Masquerade. 26
5.3.9 Addressing . 26
5.4 Deterministic remedial measures . 27
5.4.1 General . 27
5.4.2 Sequence number. 27
5.4.3 Time stamp . 27
5.4.4 Time expectation . 27
5.4.5 Connection authentication . 27
5.4.6 Feedback message . 27
5.4.7 Data integrity assurance . 27
5.4.8 Redundancy with cross checking . 28
5.4.9 Different data integrity assurance systems . 28
5.5 Typical relationships between errors and safety measures . 28
5.6 Communication phases . 29
5.7 FSCP implementation aspects . 30
5.8 Models for estimation of the total residual error rate . 30
5.8.1 Applicability . 30
5.8.2 General models for black channel communications . 31
IEC 61784-3:2021 © IEC 2021 – 3 –
5.8.3 Identification of generic safety properties . 31
5.8.4 Assumptions for residual error rate calculations . 32
5.8.5 Residual error rates . 33
5.8.6 Data integrity . 35
5.8.7 Authenticity. 36
5.8.8 Timeliness . 38
5.8.9 Masquerade. 41
5.8.10 Calculation of the total residual error rates . 41
5.8.11 Total residual error rate and SIL . 43
5.8.12 Configuration and parameterization for an FSCP . 43
5.9 Relationship between functional safety and security . 45
5.10 Boundary conditions and constraints . 45
5.10.1 Electrical safety . 45
5.10.2 Electromagnetic compatibility (EMC) . 46
5.11 Installation guidelines . 46
5.12 Safety manual . 46
5.13 Safety policy . 46
6 Communication Profile Family 1 (FOUNDATION™ Fieldbus) – Profiles for functional
safety . 47
7 Communication Profile Family 2 (CIP™) and Family 16 (SERCOS®) – Profiles for
functional safety . 47
8 Communication Profile Family 3 (PROFIBUS™, PROFINET™) – Profiles for
functional safety . 48
9 Communication Profile Family 6 (INTERBUS®) – Profiles for functional safety . 48
10 Communication Profile Family 8 (CC-Link™) – Profiles for functional safety . 49
10.1 Functional Safety Communication Profile 8/1 . 49
10.2 Functional Safety Communication Profile 8/2 . 49
11 Communication Profile Family 12 (EtherCAT™) – Profiles for functional safety. 49
12 Communication Profile Family 13 (Ethernet POWERLINK™) – Profiles for
functional safety . 50
13 Communication Profile Family 14 (EPA®) – Profiles for functional safety . 50
14 Communication Profile Family 17 (RAPIEnet™) – Profiles for functional safety. 50
15 Communication Profile Family 18 (SafetyNET p™ Fieldbus) – Profiles for
functional safety . 51
Annex A (informative) Example functional safety communication models . 52
A.1 General . 52
A.2 Model A (single message, channel and FAL, redundant SCLs) . 52
A.3 Model B (full redundancy) . 52
A.4 Model C (redundant messages, FALs and SCLs, single channel) . 53
A.5 Model D (redundant messages and SCLs, single channel and FAL) . 53
Annex B (normative) Safety communication channel model using CRC-based error
checking . 55
B.1 Overview. 55
B.2 Channel model for calculations . 55
B.3 Bit error probability Pe . 56
B.4 Cyclic redundancy checking . 57
B.4.1 General . 57
B.4.2 Requirements for methods to calculate R . 57
CRC
Annex C (informative) Structure of technology-specific parts. 59
– 4 – IEC 61784-3:2021 © IEC 2021
Annex D (informative) Assessment guideline . 62
D.1 Overview. 62
D.2 Channel types . 62
D.2.1 General . 62
D.2.2 Black channel . 62
D.2.3 White channel . 62
D.3 Data integrity considerations for white channel approaches . 63
D.3.1 General . 63
D.3.2 Models B and C . 63
D.3.3 Models A and D . 64
D.4 Verification of safety measures . 64
D.4.1 General . 64
D.4.2 Implementation . 65
D.4.3 Default safety action . 65
D.4.4 Safe state . 65
D.4.5 Transmission errors . 65
D.4.6 Safety reaction and response times . 65
D.4.7 Combination of measures . 65
D.4.8 Absence of interference . 66
D.4.9 Additional fault causes (white channel) . 66
D.4.10 Reference test beds and operational conditions . 66
D.4.11 Conformance tester . 66
Annex E (informative) Examples of implicit vs. explicit FSCP safety measures. 67
E.1 General . 67
E.2 Example fieldbus message with safety PDUs . 67
E.3 Model with completely explicit safety measures . 67
E.4 Model with explicit A-code and implicit T-code safety measures . 68
E.5 Model with explicit T-code and implicit A-code safety measures . 68
E.6 Model with split explicit and implicit safety measures . 69
E.7 Model with completely implicit safety measures . 70
E.8 Addition to Annex B – impact of implicit codes on properness . 70
Annex F (informative) Legacy models for estimation of the total residual error rate . 71
F.1 General . 71
F.2 Calculation of the residual error rate . 71
F.3 Total residual error rate and SIL . 73
Annex G (informative) Implicit data safety mechanisms for IEC 61784-3 functional
safety communication profiles (FSCPs) . 74
G.1 Overview. 74
G.2 Basic principles . 74
G.3 Problem statement: constant values for implicit data . 75
G.4 RP for FSCPs with random, uniformly distributed err . 78
impl
G.4.1 General . 78
i
G.4.2 Uniform distribution within the interval [0;2 -1], i ≥ r . 79
r
G.4.3 Uniform distribution in the interval [1;2 -1], i = r . 81
G.5 General case . 83
G.6 Calculation of P . 83
ID
Annex H (informative) Residual error probability for example CRC codes (tables for
verification of calculation methods) . 85
H.1 Overview. 85
IEC 61784-3:2021 © IEC 2021 – 5 –
H.2 Example of a 32-bit CRC. 85
H.3 Example of a 16-bit CRC. 90
H.4 Conclusion . 94
Bibliography . 96
Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) . 9
Figure 2 – Relationships of IEC 61784-3 with other standards (process) . 10
Figure 3 – Transitions from Ed. 2 to Ed. 4 and future Ed. 5 assessment methods . 11
Figure 4 – Safety communication as a part of a safety function . 23
Figure 5 – Example model of a functional safety communication system . 24
Figure 6 – Example of safety function response time components . 25
Figure 7 – Conceptual FSCP protocol model . 30
Figure 8 – FSCP implementation aspects. 30
Figure 9 – Black channel from an FSCP perspective . 31
Figure 10 – Model for authentication considerations . 36
Figure 11 – Fieldbus and internal address errors . 37
Figure 12 – Example of slowly increasing message latency . 39
Figure 13 – Example of an active network element failure . 40
Figure 14 – Example application 1 (m = 4) . 42
Figure 15 – Example application 2 (m = 2) . 42
Figure 16 – Example of configuration and parameterization procedures for FSCP . 44
Figure A.1 – Model A . 52
Figure A.2 – Model B . 53
Figure A.3 – Model C . 53
Figure A.4 – Model D . 54
Figure B.1 – Binary symmetric channel (BSC) . 55
Figure B.2 – Block codes for error detection . 56
Figure B.3 – Example of a block with a message part and a CRC signature . 57
Figure B.4 – Proper and improper CRC polynomials . 58
Figure D.1 – Basic Markov model . 64
Figure E.1 – Example safety PDUs embedded in a fieldbus message . 67
Figure E.2 – Model with completely explicit safety measures . 67
Figure E.3 – Model with explicit A-code and implicit T-code safety measures . 68
Figure E.4 – Model with explicit T-code and implicit A-code safety measures . 69
Figure E.5 – Model with split explicit and implicit safety measures . 69
Figure E.6 – Model with completely implicit safety measures . 70
Figure F.1 – Example application 1 (m = 4) . 72
Figure F.2 – Example application 2 (m = 2) . 73
Figure G.1 – FSCP with implicit transmission of authenticity and/or timeliness codes . 75
Figure G.2 – Example of an incorrect transmission with multiple error causes . 76
Figure G.3 – Impact of errors in implicit data on the residual error probability . 77
Figure H.1 – Residual error probabilities (example of a 32-bit CRC – result 1) . 87
Figure H.2 – Residual error probabilities (example of a 32-bit CRC – result 2) . 87
– 6 – IEC 61784-3:2021 © IEC 2021
Figure H.3 – Residual error probabilities (example of a 32-bit CRC – result 3) . 88
Figure H.4 – Residual error probabilities (example of a 32-bit CRC – result 4) . 88
Figure H.5 – Residual error probabilities (example of a 32-bit CRC – result 5) . 89
Figure H.6 – Residual error probabilities (example of a 32-bit CRC – result 6) . 89
Figure H.7 – Residual error probabilities (example of a 16-bit CRC – result 1) . 92
Figure H.8 – Residual error probabilities (example of a 16-bit CRC – result 2) . 92
Figure H.9 – Residual error probabilities (example of a 16-bit CRC – result 3) . 93
Figure H.10 – Residual error probabilities (example of a 16-bit CRC – result 4) . 93
Figure H.11 – Residual error probabilities (example of a 16-bit CRC – result 5) . 94
Figure H.12 – Example 1 of improper polynomial . 94
Figure H.13 – Example 2 of improper polynomial . 95
Table 1 – Overview of the effectiveness of the various measures on the possible errors . 29
Table 2 – Typical relationship of residual error rate to SIL . 43
Table 3 – Typical relationship of residual error on demand to SIL . 43
Table 4 – Overview of profile identifier usable for FSCP 6/7 . 48
Table B.1 – Example dependency d and block bit length n . 56
min
Table C.1 – Common subclause structure for technology-specific parts . 59
Table F.1 – Definition of items used for calculation of the residual error rates . 72
Table F.2 – Typical relationship of residual error rate to SIL . 73
Table F.3 – Typical relationship of residual error on demand to SIL . 73
Table H.1 – Residual error probabilities (R ) for example CRC32 polynomial . 86
CRC1
Table H.2 – Residual error probabilities (R ) for example CRC16 polynomial . 91
CRC2
IEC 61784-3:2021 © IEC 2021 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 3: Functional safety fieldbuses –
General rules and profile definitions
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61784-3 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This fourth edition cancels and replaces the third edition, published in 2016 and its
Amendment 1, published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• Contents of previous Annex F were corrected based on feedback from peer review and
subsequent analysis (in particular deletion of RP for data integrity, reduction of the
U
Equation for RR , and clarifications on the values of RP and R ).
A I T
• Additional assumptions for residual error rate calculations, clarification of assumption a).
– 8 – IEC 61784-3:2021 © IEC 2021
• After correction, contents of previous Annex F were exchanged with the contents of
previous Subclause 5.8.
• Contents of Subclause 5.9 on security replaced by a simple reference to IEC 62443 in
accordance with Guide 120.
• Changes in Annex B: Dependency of this Annex B with the BSC model has been
highlighted. First two paragraphs and figure in Clause B.2 have been deleted because of
little relevance. The approximation Equation (B.4) has been deleted due to obsolescence,
based on the observations that the CRC shall be anyway explicitly calculated in order to
prove properness, and that it may produce optimistic results. Guidance for calculation of
R in B.4.2 has been reviewed.
CRC
• Changes in Annex D: Formula D.1 was changed from an approximation to a proper
Equation, with some adjustments, and contents of D.4.3 were clarified (default safety
action).
• New informative Annex H, providing additional guidance for the calculation of RCRC.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/1067/FDIS 65C/1072/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
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
...
SIST EN IEC 61784-3:2021は、産業用通信ネットワークにおけるフィールドバスの安全機能に関連するプロファイルを規定している重要な標準である。この標準は、特にIEC 61508に準拠した機能安全の要求に基づき、安全性に関連するメッセージを分散ネットワーク内の参加者間で伝送するための共通原則を明示している。これにより、プロセス制御、製造自動化、機械などのさまざまな産業アプリケーションでの適用が可能になる。 SIST EN IEC 61784-3:2021の強みは、そのブラックチャンネルアプローチに基づいた原則にある。これにより、フィールドバス技術を用いた伝送が効率的に行われ、安全性を保ちながらも柔軟性のあるシステム設計が実現できる。また、全ての適用分野において一貫性のある安全通信が保証されるため、ユーザーは自信を持ってこの標準を適用することができる。 この標準は、特に機能安全に対する需要が高まっている今日の産業環境において、その関連性をますます増している。分散ネットワークにおける安全性の確保は、産業プロセスの信頼性や効率性に直接影響するため、SIST EN IEC 61784-3:2021の導入は企業にとって戦略的な意味を持つ。全体として、この標準は、機能安全なフィールドバスの利用促進に向けた関連するガイダンスを提供し、産業通信ネットワークの進化に寄与している。
The SIST EN IEC 61784-3:2021 standard addresses a critical need in the field of industrial communication networks, specifically focusing on profiles related to functional safety fieldbuses. The scope of this standard is comprehensive, providing a clear framework for transmitting safety-relevant messages across distributed networks that utilize fieldbus technology. This is particularly significant for industries reliant on IEC 61508 standards, which pertain to functional safety, ensuring that safety communications are upheld in various applications such as process control, manufacturing automation, and machinery. One of the key strengths of the SIST EN IEC 61784-3:2021 standard is its emphasis on the black channel approach. This principle allows for the reliable and effective transmission of data without compromising safety integrity, making it well-suited for environments where risk management is paramount. By clarifying the functional safety requirements and providing standardized practices for fieldbus systems, the document fosters greater interoperability and consistency across different industrial applications. Furthermore, the standard enhances the relevance of functional safety protocols in the rapidly evolving landscape of industrial automation. As more companies integrate advanced communication technologies, the guidelines set forth in SIST EN IEC 61784-3:2021 are essential for ensuring that safety measures are properly implemented, thereby reducing the likelihood of failures that could lead to catastrophic events. The guidelines delineate clear profile definitions and general rules, serving as a foundational reference for engineers and professionals in the field. In summary, the SIST EN IEC 61784-3:2021 standard significantly contributes to the domain of industrial communication networks, particularly in enhancing the safety framework for fieldbus applications. Its scope addresses current industry needs while its strengths underscore the importance of reliable safety communications in today's automated environments.
Le document SIST EN IEC 61784-3:2021 traite des réseaux de communication industrielle, en se concentrant spécifiquement sur la sécurité fonctionnelle des fieldbus. Ce standard, en conformité avec les exigences IEC 61508, pose des principes communs essentiels pour la transmission de messages critiques pour la sécurité au sein de réseaux distribués utilisant la technologie fieldbus. Parmi les forces notables de la norme, on retrouve son approche du "canal noir", qui est fondamentale pour garantir des communications sécurisées dans divers contextes industriels tels que le contrôle de processus, l'automatisation des fabrications et la machinerie. Ce cadre rigoureux permet aux professionnels de s'assurer que les systèmes en place répondent adéquatement aux normes de sécurité fonctionnelle. La pertinence de la norme SIST EN IEC 61784-3:2021 est indéniable dans le paysage industriel actuel, où la sécurité des systèmes de communication est primordiale. En fournissant des définitions de profils et des règles générales, le standard facilite l'application et l'adoption des technologies de fieldbus tout en renforçant les critères de sécurité indispensables dans des environnements critiques. Ce document constitue donc une ressource précieuse pour les acteurs du secteur cherchant à améliorer la sécurité des communications et à se conformer aux exigences actuelles en matière de sécurité fonctionnelle dans leurs systèmes d’automatisation.
Die Norm SIST EN IEC 61784-3:2021 bietet eine umfassende Grundlage für industrielle Kommunikationsnetzwerke und fokussiert sich speziell auf funktionale Sicherheit in Feldbussystemen. Der Anwendungsbereich dieser Norm ist von großer Bedeutung, da sie wesentliche Prinzipien zur Übertragung von sicherheitsrelevanten Nachrichten in verteilten Netzwerken definiert, die Feldbusstechnologie nutzen. Diese Prinzipien basieren auf dem Konzept des „Black Channel“ und sind gemäß den Anforderungen der IEC 61508 für funktionale Sicherheit entwickelt worden. Ein herausragendes Merkmal dieser Norm ist die Klarheit in der Definition von allgemeinen Regeln und Profilen, die eine Vielzahl von industriellen Anwendungen abdecken. Dazu gehören unter anderem die Prozesskontrolle, die Fertigungsautomatisierung und der Maschinenbau. Dies zeigt, dass die Norm äußerst relevant ist und eine breite Anwendbarkeit in unterschiedlichen Bereichen der Industrie besitzt. Ein weiterer Vorteil der SIST EN IEC 61784-3:2021 liegt in ihrer Fähigkeit, die Interoperabilität zwischen verschiedenen Systemen zu fördern, indem sie sicherstellt, dass die geteilten Kommunikationsprotokolle und Schnittstellen den Anforderungen der funktionalen Sicherheit entsprechen. Die Standardisierung dieser Aspekte verbessert nicht nur die Sicherheit in industriellen Anwendungen, sondern trägt auch zur Effizienzsteigerung bei. Zusammenfassend ist die SIST EN IEC 61784-3:2021 von zentraler Bedeutung für die Entwicklung und Implementierung von sicheren, zuverlässigen und interoperablen Feldbussystemen, die in einer Vielzahl von industriellen Umgebungen eingesetzt werden können. Die Norm stellt sicher, dass die Sicherheitsanforderungen klar definiert und umgesetzt werden, was zur Verringerung von Risiken und zur Verbesserung des Gesamtsystems führt.
SIST EN IEC 61784-3:2021 표준 문서는 산업 통신 네트워크에 대한 중요한 지침을 제공합니다. 이 표준은 기능적 안전성을 확보하기 위해 분산 네트워크 내에서 안전 관련 메시지를 전송하는 데 사용할 수 있는 공통 원칙들을 설명합니다. 특히, 이 표준은 IEC 61508의 요구사항에 따라 필드버스 기술을 사용하는 다양한 산업 애플리케이션에서 활용될 수 있습니다. SIST EN IEC 61784-3:2021의 주요 강점은 블랙 채널 접근 방식을 기반으로 하고 있어, 데이터 전송의 신뢰성을 높이는 동시에 안전한 커뮤니케이션을 보장하는 데 있습니다. 이를 통해 다양한 산업 환경, 특히 프로세스 제어, 제조 자동화 및 기계와 같은 분야에서 안전성을 향상시킬 수 있습니다. 또한, 이 표준은 기능적 안전성 분야에서 최신 기술 동향을 반영하고 있어, 관련 업계 종사자들에게 실용적인 지침을 제공하며, 기업들이 안전 규정을 준수할 수 있도록 돕습니다. 이러한 측면에서 SIST EN IEC 61784-3:2021은 산업용 통신 네트워크의 발전에 중요한 역할을 하며, 다양한 응용 분야에서 필수적인 표준으로 자리 잡고 있습니다.
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...