SIST EN 61784-3-18:2011/A2:2021

Industrial communication networks - Profiles - Part 3-18: Functional safety fieldbuses - Additional specifications for CPF 18 (IEC 61784-3-18:2011/AMD2:2021)

2021-05-06: IEC 61784 series circulated to vote as one document IEC 61784-3-X (65C/1083/FDIS) & split at publication stage into: IEC 61784-3-2, IEC 61784-3-3, IEC 61784-3-8, IEC 61784-3-13 & IEC 61784-3-18:2011/A2:2021

Industrielle Kommunikationsnetze - Profile - Teil 3-18: Funktional sichere Übertragung bei Feldbussen - Zusätzliche Festlegungen für die Kommunikationsprofilfamilie 18 (IEC 61784-3-18:2011/AMD2:2021)

Réseaux de communication industriels - Profils - Partie 3-18: Bus de terrain de sécurité fonctionnelle - Spécifications supplémentaires pour CPF 18 (IEC 61784-3-18:2011/AMD2:2021)

Industrijska komunikacijska omrežja - Profili - 3-18. del: Funkcijska varnost procesnih vodil - Dodatne specifikacije za CPF 18 (IEC 61784-3-18:2011/AMD2:2021)

General Information

• Status: Published
• Publication Date: 02-Sep-2021
• 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: 01-Jul-2021
• Due Date: 05-Sep-2021
• Completion Date: 03-Sep-2021
• Ref Project: EN 61784-3-18:2011/A2:2021 - Industrial communication networks - Profiles - Part 3-18: Functional safety fieldbuses - Additional specifications for CPF 18

Relations

• Amends: SIST EN 61784-3-18:2011 - Industrial communication networks - Profiles - Part 3-18: Functionnal safety fieldbuses - Additional specifications for CPF 18 (IEC 61784-3-18:2011)
• Effective Date: 11-May-2021

Overview

SIST EN 61784-3-18:2011/A2:2021 is a European standard developed by the CLC under the IEC 61784 series. It focuses on industrial communication networks, specifically on profiles for functional safety fieldbuses with additional specifications for the CPF 18 communication profile family. This amendment 2 of the 2011 edition introduces editorial and informational corrections aligned with Edition 4 of IEC 61784-3, ensuring accurate application and interoperability of safety communication protocols in industrial process measurement, control, and automation.

Key Topics

• Functional Safety Fieldbuses (FSCP): The standard details additional specifications for CPF 18, a communication profile family used in functional safety applications. It addresses enhancements in safety communication layers, including protocol and error detection methods essential for reliable industrial network operation.

• Safety Communication Protocol: SIST EN 61784-3-18:2011/A2:2021 refines safety communication layer protocols with updates to safety data handling, CRC (cyclic redundancy check) calculations, and hash function implementations that improve data integrity and residual error probabilities.

• CRC32 Polynomial: The amendment specifies the 32-bit CRC polynomial (0x120044009) used in CPF 18 for robust error detection within safety-related data transmissions, including updated residual error probability tables for different bit error rates and code lengths.

• Conformance and Interoperability: Compliance to this standard ensures systems meet international safety requirements consistent with IEC 62061 and other harmonized standards like EN 61000-1-2 and EN ISO 13849, facilitating multi-vendor interoperability and harmonized risk levels.

Applications

• Industrial Process Automation: Used extensively in sectors where functional safety is critical, such as chemical processing, oil and gas, and manufacturing plants. The standard ensures safety-related fieldbus networks deliver reliable communication for safety instrumented systems (SIS).

• Safety Instrumented Systems (SIS): Implements robust network communications that comply with Safety Integrity Levels (SIL) and Performance Levels (PL), necessary for safeguarding machinery and processes against hazardous failures.

• Multilayer Safety Systems: Supports multilayer applications, enabling integration of safety functions within complex communication environments and linking devices like sensors, actuators, and controllers with certified safety protocols.

• Electromagnetic Compatibility (EMC): The guideline includes considerations for specified electromagnetic environments, aligning with IEC 61326-3-1 and IEC 61000-6-7 standards, which ensures network reliability under interference-prone conditions.

Related Standards

• IEC 61784 Series: SIST EN 61784-3-18:2011/A2:2021 is a part of the broader IEC 61784 series, which covers profiles for industrial communication networks focusing on functional safety fieldbuses.

• IEC 62061: Specifies the relationship between Safety Integrity Levels (SIL) and Performance Levels (PL), directly referenced for clarity on safety requirements in the standard.

• EN 61000-1-2 & EN 61000-6-7: Standards harmonized for electromagnetic compatibility (EMC), relevant for ensuring functional safety communication networks operate reliably in industrial environments.

• EN ISO 13849 Series: Provides harmonization for safety-related parts of control systems, complementing the communication profiles for safety fieldbuses dictated by EN 61784-3-18.

Practical Value

Adopting SIST EN 61784-3-18:2011/A2:2021 enables industries to achieve high levels of functional safety in industrial communication networks. It establishes precise communication protocols, enhances error detection mechanisms, and supports conformity with international safety requirements, ensuring a safe, reliable, and interoperable environment for process automation. This reduces operational risks, improves system durability, and facilitates compliance with regulatory frameworks governing safety-critical applications.

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Keywords: EN 61784-3-18, functional safety fieldbuses, CPF 18, industrial communication networks, safety communication protocol, CRC32 polynomial, IEC 61784 series, IEC 62061, Safety Integrity Level, Performance Level, SIS, functional safety, industrial automation, electromagnetic compatibility, IEC standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2021
Industrijska komunikacijska omrežja - Profili - 3-18. del: Funkcijska varnost
procesnih vodil - Dodatne specifikacije za CPF 18 (IEC 61784-3-
18:2011/AMD2:2021)
Industrial communication networks - Profiles - Part 3-18: Functional safety fieldbuses -
Additional specifications for CPF 18 (IEC 61784-3-18:2011/AMD2:2021)
Industrielle Kommunikationsnetze - Profile - Teil 3-18: Funktional sichere Übertragung
bei Feldbussen - Zusätzliche Festlegungen für die Kommunikationsprofilfamilie 18 (IEC
61784-3-18:2011/AMD2:2021)
Réseaux de communication industriels - Profils - Partie 3-18: Bus de terrain de sécurité
fonctionnelle - Spécifications supplémentaires pour CPF 18 (IEC 61784-3-
18:2011/AMD2:2021)
Ta slovenski standard je istoveten z: EN 61784-3-18:2011/A2:2021
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 61784-3-18:2011/A2

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2021
ICS 25.040.40; 35.100.05
English Version
Industrial communication networks - Profiles - Part 3-18:
Functional safety fieldbuses - Additional specifications for CPF
(IEC 61784-3-18:2011/AMD2:2021)
Réseaux de communication industriels - Profils - Partie 3- Industrielle Kommunikationsnetze - Profile - Teil 3-18:
18: Bus de terrain de sécurité fonctionnelle - Spécifications Funktional sichere Übertragung bei Feldbussen -
supplémentaires pour CPF 18 Zusätzliche Festlegungen für die
(IEC 61784-3-18:2011/AMD2:2021) Kommunikationsprofilfamilie 18
(IEC 61784-3-18:2011/AMD2:2021)
This amendment A2 modifies the European Standard EN 61784-3-18:2011; it was approved by CENELEC on 2021-06-04. 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,
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 61784-3-18:2011/A2:2021 E

European foreword
The text of document 65C/1083/FDIS, future IEC 61784-3-18/AMD2, 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 61784-3-18:2011/A2:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-03-04
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-06-04
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.
Endorsement notice
The text of the International Standard IEC 61784-3-18:2011/AMD2:2021 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 61000-6-7 NOTE Harmonized as EN 61000-6-7
IEC 61010-2-201 NOTE Harmonized as EN IEC 61010-2-201
IEC 61784-3 NOTE Harmonized as EN IEC 61784-3
ISO 13849 (series) NOTE Harmonized as EN ISO 13849 (series)

IEC 61784-3-18 ®
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 2
AM ENDEMENT 2
Industrial communication networks – Profiles –
Part 3-18: Functional safety fieldbuses – Additional specifications for CPF 18
Réseaux de communication industriels – Profils –
Partie 3-18: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 18
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-9757-5
– 2 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 3-18: Functional safety fieldbuses –
Additional specifications for CPF 18

AMENDMENT 2
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.
Amendment 2 to IEC 61784-3-18:2011 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
IEC 61784-3-18:2011/AMD2:2021 – 3 –
© IEC 2021
The text of this Amendment is based on the following documents:
FDIS Report on voting
65C/1083/FDIS 65C/1087/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 International Standard 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/standardsdev/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 "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
colours which are considered to be useful for the correct understanding of its
contains
contents. Users should therefore print this document using a colour printer.

_____________
INTRODUCTION to Amendment 2
This Amendment 2 introduces several editorial and informational corrections in the context of
Edition 4 of IEC 61784-3.
– 4 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021
0 Introduction
0.1 General
Replace the existing Figure 1 by the following new figure:

Replace the existing text of the NOTE below Figure 1 (before the title) by the following:
IEC 62061 specifies the relationship between PL (Category) and SIL.

IEC 61784-3-18:2011/AMD2:2021 – 5 –
© IEC 2021
Replace the existing Figure 2 by the following new figure:

Replace, below Figure 2, the existing text of figure footnote a by the following:
For specified electromagnetic environments; otherwise IEC 61326-3-1 or IEC 61000-6-7.
Delete, below Figure 2, figure footnote b.
5 General
5.1 External documents providing specifications for the profile
Replace the existing text by the following:
There is no additional external document used for FSCP 18/1.
7 Safety communication layer protocol
7.1.2.4 Safety data
Delete,
...