SIST EN 61784-3:2008

SLOVENSKI STANDARD
SIST EN 61784-3:2008
01-september-2008
Industrijska komunikacijska omrežja - Profili - 3. del: Funkcijska varnost procesnih
vodil (IEC 61784-3:2007)
Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses
Industrielle Kommunikationsnetze - Profile - Teil 3: Funktional sichere Übertragung bei
Feldbussen - Allgemeine Regeln und Profilfestlegungen
Réseaux de communication industriels - Profils - Partie 3: Bus de terrain de sécurité
fonctionnelle - Règles générales et définitions des profils
Ta slovenski standard je istoveten z: EN 61784-3:2008
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.05 9HþVORMQHXSRUDEQLãNH Multilayer applications
UHãLWYH
SIST EN 61784-3:2008 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61784-3:2008

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SIST EN 61784-3:2008

EUROPEAN STANDARD
EN 61784-3

NORME EUROPÉENNE
June 2008
EUROPÄISCHE NORM

ICS 35.100.05; 25.040.40


English version


Industrial communication networks -
Profiles -
Part 3: Functional safety fieldbuses -
General rules and profile definitions
(IEC 61784-3:2007)


Réseaux de communication industriels -  Industrielle Kommunikationsnetze -
Profils - Profile -
Partie 3: Bus de terrain Teil 3: Funktional sichere Übertragung
de sécurité fonctionnelle - bei Feldbussen -
Règles générales et définitions des profils Allgemeine Regeln und Profilfestlegungen
(CEI 61784-3:2007) (IEC 61784-3:2007)




This European Standard was approved by CENELEC on 2008-05-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61784-3:2008 E

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SIST EN 61784-3:2008
EN 61784-3:2008 - 2 -
Foreword
The text of document 65C/470/FDIS, future edition 1 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 was approved by CENELEC as EN 61784-3 on 2008-05-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-05-01
The International Electrotechnical Commission (IEC) and CENELEC draw attention to the fact that it is
claimed that compliance with this document may involve the use of patents concerning functional safety
communication profiles for families 1, 2, 3 and 6 given in EN 61784-3-1, EN 61784-3-2, EN 61784-3-3
and EN 61784-3-6.
The IEC and CENELEC take no position concerning the evidence, validity and scope of these patents
right.
The holders of these patent rights have assured the IEC that they are willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this
respect, the statements of the holders of these patent rights are registered with the IEC.
NOTE Patent details and corresponding contact information are provided in EN 61784-3-1, EN 61784-3-2, EN 61784-3-3 and
EN 61784-3-6.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61784-3:2007 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 60204-1 NOTE  Harmonized as EN 60204-1:2006 (not modified).
IEC 61496 NOTE  Harmonized as EN 61496-1:2004 (modified)
and as CLC/TS 61496-2:2006 (not modified)
and CLC/TC 61496-3:2008 (not modified)
IEC 61508-4 NOTE  Harmonized as EN 61508-4:2001 (not modified).
IEC 61508-6 NOTE  Harmonized as EN 61508-6:2001 (not modified).
IEC 61511 NOTE  Harmonized in EN 61511 series (not modified).
IEC 61800-5-2 NOTE  Harmonized as EN 61800-5-2:2007 (not modified).
IEC 62061 NOTE  Harmonized as EN 62061:2005 (not modified).
ISO 12100-1 NOTE  Harmonized as EN ISO 12100-1:2003 (not modified).
ISO 13849-1 NOTE  Harmonized as EN ISO 13849-1:2006 (not modified).
ISO 13849-2 NOTE  Harmonized as EN ISO 13849-2:2003 (not modified).
__________

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SIST EN 61784-3:2008
- 3 - EN 61784-3:2008
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

1) 2)
IEC 61131-2 - Programmable controllers - EN 61131-2 2007
Part 2: Equipment requirements and tests


IEC 61158 Series Industrial communication networks - EN 61158 Series
Fieldbus specifications


1) 2)
IEC 61326-3-1 - Electrical equipment for measurement, EN 61326-3-1 2008
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


1) 2)
IEC 61326-3-2 - Electrical equipment for measurement, EN 61326-3-2 2008
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 EN 61508 Series
electrical/electronic/programmable electronic
safety-related systems


1) 2)
IEC 61508-1 - Functional safety of EN 61508-1 2001
electrical/electronic/programmable electronic
safety-related systems -
Part 1: General requirements


1) 2)
IEC 61508-2 - Functional safety of EN 61508-2 2001
electrical/electronic/programmable electronic
safety-related systems -
Part 2: Requirements for
electrical/electronic/programmable electronic
safety-related systems


1) 2)
IEC 61784-1 - Industrial communication networks - EN 61784-1 2008
Profiles -
Part 1: Fieldbus profiles


1) 2)
IEC 61784-2 - Industrial communication networks - EN 61784-2 2008
Profiles -
Part 2: Additional fieldbus profiles for real-time
networks based on ISO/IEC 8802-3



1)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 61784-3:2008
EN 61784-3:2008 - 4 -
Publication Year Title EN/HD Year

1) 2)
IEC 61784-3-1 - Industrial communication networks - EN 61784-3-1 2008
Profiles -
Part 3-1: Functional safety fieldbuses –
Additional specifications for CPF 1


1) 2)
IEC 61784-3-2 - Industrial communication networks - EN 61784-3-2 2008
Profiles -
Part 3-2: Functional safety fieldbuses -
Additional specifications for CPF 2


1) 2)
IEC 61784-3-3 - Industrial communication networks - EN 61784-3-3 2008
Profiles -
Part 3-3: Functional safety fieldbuses -
Additional specifications for CPF 3


1) 2)
IEC 61784-3-6 - Industrial communication networks - EN 61784-3-6 2008
Profiles -
Part 3-6: Functional safety fieldbuses -
Additional specifications for CPF 6


IEC 61784-5 Series Industrial communication networks - EN 61784-5 Series
Profiles -
Part 5: Installation of fieldbuses - Installation
profiles for CPF X


1) 2)
IEC 61918 (mod) - Industrial communication networks - EN 61918 2008
Installation of communication networks in
industrial premises


IEC 62280-1 2002 Railway applications - Communication, - -
signalling and processing systems -
Part 1: Safety-related communication in
closed transmission systems

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SIST EN 61784-3:2008
IEC 61784-3
Edition 1.0 2007-12
INTERNATIONAL
STANDARD

Industrial communication networks – Profiles –
Part 3: Functional safety fieldbuses – General rules and profile definitions

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 35.100.05 25.040.40 ISBN 2-8318-9397-6

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SIST EN 61784-3:2008
– 2 – 61784-3 © IEC:2007(E)

CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.10
2 Normative references .10
3 Terms, definitions, symbols, abbreviated terms and conventions .11
3.1 Terms and definitions .11
3.1.1 Common terms and definitions .11
3.1.2 CPF 1: Additional terms and definitions .16
3.1.3 CPF 2: Additional terms and definitions .16
3.1.4 CPF 3: Additional terms and definitions .16
3.1.5 CPF 6: Additional terms and definitions .16
3.2 Symbols and abbreviated terms.17
3.2.1 Common symbols and abbreviated terms .17
3.2.2 CPF 1: Additional symbols and abbreviated terms .17
3.2.3 CPF 2: Additional symbols and abbreviated terms .17
3.2.4 CPF 3: Additional symbols and abbreviated terms .17
3.2.5 CPF 6: Additional symbols and abbreviated terms .17
4 Conformance.18
5 Basics of safety-related fieldbus systems .18
5.1 Safety function decomposition.18
5.2 Communication system .19
5.2.1 General .19
5.2.2 IEC 61158 fieldbuses .19
5.2.3 Communication channel types .20
5.2.4 Safety function response time.20
5.3 Communication errors .21
5.3.1 General .21
5.3.2 Corruption .21
5.3.3 Unintended repetition .21
5.3.4 Incorrect sequence .21
5.3.5 Loss .22
5.3.6 Unacceptable delay .22
5.3.7 Insertion .22
5.3.8 Masquerade .22
5.3.9 Addressing .22
5.4 Deterministic remedial measures.22
5.4.1 General .22
5.4.2 Sequence number .23
5.4.3 Time stamp .23
5.4.4 Time expectation .23
5.4.5 Connection authentication .23
5.4.6 Feedback message .23
5.4.7 Data integrity assurance.23
5.4.8 Redundancy with cross checking .23
5.4.9 Different data integrity assurance systems .24
5.5 Relationships between errors and safety measures .24

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SIST EN 61784-3:2008
61784-3 © IEC:2007(E) – 3 –
5.6 Data integrity considerations .25
5.6.1 Calculation of the residual error rate.25
5.6.2 Residual error rate and SIL.27
5.7 Relationship between functional safety and security .27
5.8 Boundary conditions and constraints .27
5.8.1 Electrical safety.27
5.8.2 Electromagnetic compatibility (EMC) .27
5.9 Installation guidelines.28
5.10 Safety manual .28
5.11 Safety policy .28
6 Communication Profile Family 1 (FOUNDATION™ Fieldbus) – Profiles for functional
safety .29
6.1 Functional Safety Communication Profile 1/1.29
6.2 Technical overview.29
7 Communication Profile Family 2 (CIP™) – Profiles for functional safety.30
7.1 Functional Safety Communication Profile 2/1.30
7.2 Technical overview.30
8 Communication Profile Family 3 (PROFIBUS™, PROFINET™) – Profiles for
functional safety .31
8.1 Functional Safety Communication Profile 3/1.31
8.2 Technical overview.31
9 Communication Profile Family 6 (INTERBUS®) – Profiles for functional safety .34
9.1 Functional Safety Communication Profile 6/7.34
9.2 Technical overview.34
Annex A (informative) Example functional safety communication models .36
A.1 General .36
A.2 Model A.36
A.3 Model B.36
A.4 Model C.37
A.5 Model D.37
Annex B (informative) A safety communication channel model using CRC-based error
checking.39
B.1 Overview .39
B.2 Channel model for calculations.39
B.3 Cyclic redundancy checking .40
B.3.1 General .40
B.3.2 Considerations concerning CRC polynomials .42
Annex C (informative) Structure of technology-specific parts .44
Bibliography.46

Table 1 – Overview of the effectiveness of the various measures on the possible errors.25
Table 2 – Definition of items used for calculation of the residual error rate.26
Table 3 – Relationship of residual error rate to SIL level .27
Table 4 – Overview of profile identifier usable for FSCP 6/7.34
Table B.1 – Example dependency d and block length n.42
min
Table C.1 – Common subclause structure for technology-specific parts .44

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SIST EN 61784-3:2008
– 4 – 61784-3 © IEC:2007(E)


Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) .7
Figure 2 – Relationships of IEC 61784-3 with other standards (process).8
Figure 3 – Safety communication as a part of a safety function.19
Figure 4 – Example model of a functional safety communication system .20
Figure 5 – Example of safety function response time components.21
Figure 6 – Example application .26
Figure 7 – Scope of FSCP 1/1 .29
Figure 8 – Relationship of Safety Validators .30
Figure 9 – Basic communication preconditions for FSCP 3/1 .32
Figure 10 – Structure of a FSCP 3/1 safety PDU.33
Figure 11 – Safe communication modes.33
Figure 12 – FSCP 6/7 communication preconditions .35
Figure A.1 – Model A .36
Figure A.2 – Model B .37
Figure A.3 – Model C .37
Figure A.4 – Model D .38
Figure B.1 – Communication channel with perturbation.39
Figure B.2 – Binary symmetric channel (BSC).40
Figure B.3 – Example of a block with message and CRC bits (redundancy code).41
Figure B.4 – Block codes for error detection .41
Figure B.5 – Proper and improper CRC polynomials .42

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SIST EN 61784-3:2008
61784-3 © IEC:2007(E) – 5 –
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed that compliance
with this document may involve the use of patents concerning functional safety communication profiles for families
1, 2, 3 and 6 given in IEC 61784-3-1, IEC 61784-3-2, IEC 61784-3-3 and IEC 61784-3-6.
IEC takes no position concerning the evidence, validity and scope of these patent rights.The holders of these
patent rights have assured the IEC that they are willing to negotiate licences under reasonable and non-
discriminatory terms and conditions with applicants throughout the world. In this respect, the statements of the
holders of these patent rights are registered with IEC.
NOTE Patent details and corresponding contact information are provided in IEC 61784-3-1, IEC 61784-3-2, IEC
61784-3-3 and IEC 61784-3-6.
International Standard IEC 61784-3 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial process measurement, control and
automation.

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SIST EN 61784-3:2008
– 6 – 61784-3 © IEC:2007(E)

The text of this standard is based on the following documents:
FDIS Report on voting
65C/470/FDIS 65C/481/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The list of all parts of the IEC 61784-3 series, under the general title Industrial
communications networks – Profiles – Functional safety fieldbuses, can be found on the IEC
website.

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SIST EN 61784-3:2008
61784-3 © IEC:2007(E) – 7 –
INTRODUCTION
The IEC 61158 fieldbus standard together with its companion standards IEC 61784-1 and
IEC 61784-2 defines a set of communication protocols that enable distributed control of
automation applications. Fieldbus technology is now considered well accepted and well
proven. Thus many fieldbus enhancements are emerging, addressing not yet standardized
areas such as real time, safety-related and security-related applications.
This standard explains the relevant principles for functional safety communications with
reference to IEC 61508 series and specifies several safety communication layers (profiles and
corresponding protocols) based on the communication profiles and protocol layers of
IEC 61784-1, IEC 61784-2 and the IEC 61158 series. It does not cover electrical safety and
intrinsic safety aspects.
Figure 1 shows the relationships between this standard and relevant safety and fieldbus
standards in a machinery environment.
Product standards
ISO 12100-1 and ISO 14121
ISO 12100-1 and ISO 14121
IEC 61496 IEC 61131-6 IEC 61800-5-2 Safety of machinery – Principles for
Safety of machinery – Principles for
IEC 61496 IEC 61131-6 IEC 61800-5-2
Safety f. e.g. SaSafetfety foyr foPrLC Safety functions desig
...