IEC 61784-3:2010
(Main)Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions
Industrial communication networks - Profiles - Part 3: Functional safety fieldbuses - General rules and profile definitions
IEC 61784-3:2010 explains some common principles than can be used in the transmission of safety-relevant messages among participants within a distributed network using fieldbus technology in accordance with the requirements of IEC 61508 series for functional safety. These principles can be used in various industrial applications such as process control, manufacturing automation and machinery. This second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes with respect to the previous edition are:
- clarifications and additional explanations for requirements, updated references;
- updates of definitions and requirements in relation with the new edition of IEC 61508;
- addition of a new informative Annex D providing an assessment guideline;
- updates in parts for CPF 1, CPF 2, CPF 3, CPF 6 (details provided in the parts);
- addition of new parts for CPF 8, CPF 12, CPF 13, CPF 14;
- in CPF parts, addition of an annex to provide information about test laboratories for testing and validating conformance of FSCP products.
This bilingual version published in 2011-12, corresponds to the English version published in 2010-07.
Réseaux de communication industriels - Profils - Partie 3: Bus de terrain de sécurité fonctionnelle - Règles générales et définitions de profils
La CEI 61784-3:2010 définit des principes communs pouvant être appliqués pour la transmission des messages propres à la sécurité entre les participants d'un réseau réparti, en utilisant la technologie de bus de terrain conformément aux exigences de la série CEI 61508 concernant la sécurité fonctionnelle. Ces principes peuvent être utilisés dans diverses applications industrielles, telles que la commande de processus, l'usinage automatique et les machines. Cette seconde édition annule et remplace la première édition parue en 2007 et constitue une révision technique. Les principales modifications par rapport à l'édition précédente sont:
- clarifications et explications complémentaires des exigences, références actualisées;
- actualisations des définitions et exigences par rapport à la nouvelle édition de la CEI 61508;
- ajout d'une nouvelle Annexe D informative fournissant une ligne directrice relative à l'évaluation;
- actualisations des parties pour les CPF 1, CPF 2, CPF 3, CPF 6 (détails fournis dans les parties);
- ajout de nouvelles parties pour les CPF 8, CPF 12, CPF 13, CPF 14;
- dans les parties CPF, ajout d'une annexe afin de fournir des informations concernant les laboratoires d'essais, en vue d'une vérification par des essais et d'une validation de la conformité des produits FSCP.
La présente version bilingue, correspond à la version anglaise monolingue publié en 2010-07.
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Industrial communication networks – Profiles –
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IEC 61784-3:2010(E)
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THIS PUBLICATION IS COPYRIGHT PROTECTED
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IEC 61784-3
®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Profiles –
Part 3: Functional safety fieldbuses – General rules and profile definitions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XA
ICS 25.040.40; 35.100.05 ISBN 978-2-88910-948-7
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – 61784-3 © IEC:2010(E)
CONTENTS
FOREWORD.6
0 Introduction .8
0.1 General .8
0.2 Patent declaration .10
1 Scope.11
2 Normative references .11
3 Terms, definitions, symbols, abbreviated terms and conventions .13
3.1 Terms and definitions .13
3.1.1 Common terms and definitions .13
3.1.2 CPF 1: Additional terms and definitions .18
3.1.3 CPF 2: Additional terms and definitions .18
3.1.4 CPF 3: Additional terms and definitions .18
3.1.5 CPF 6: Additional terms and definitions .18
3.1.6 CPF 8: Additional terms and definitions .18
3.1.7 CPF 12: Additional terms and definitions .18
3.1.8 CPF 13: Additional terms and definitions .18
3.1.9 CPF 14: Additional terms and definitions .18
3.2 Symbols and abbreviated terms.19
3.2.1 Common symbols and abbreviated terms .19
3.2.2 CPF 1: Additional symbols and abbreviated terms .19
3.2.3 CPF 2: Additional symbols and abbreviated terms .19
3.2.4 CPF 3: Additional symbols and abbreviated terms .19
3.2.5 CPF 6: Additional symbols and abbreviated terms .20
3.2.6 CPF 8: Additional symbols and abbreviated terms .20
3.2.7 CPF 12: Additional symbols and abbreviated terms .20
3.2.8 CPF 13: Additional symbols and abbreviated terms .20
3.2.9 CPF 14: Additional symbols and abbreviated terms .20
4 Conformance.20
5 Basics of safety-related fieldbus systems .21
5.1 Safety function decomposition.21
5.2 Communication system .21
5.2.1 General .21
5.2.2 IEC 61158 fieldbuses .21
5.2.3 Communication channel types .22
5.2.4 Safety function response time.22
5.3 Communication errors .23
5.3.1 General .23
5.3.2 Corruption .23
5.3.3 Unintended repetition .23
5.3.4 Incorrect sequence .23
5.3.5 Loss .24
5.3.6 Unacceptable delay .24
5.3.7 Insertion .24
5.3.8 Masquerade .24
5.3.9 Addressing .24
5.4 Deterministic remedial measures.24
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61784-3 © IEC:2010(E) – 3 –
5.4.1 General .24
5.4.2 Sequence number .25
5.4.3 Time stamp .25
5.4.4 Time expectation .25
5.4.5 Connection authentication .25
5.4.6 Feedback message .25
5.4.7 Data integrity assurance.25
5.4.8 Redundancy with cross checking .25
5.4.9 Different data integrity assurance systems .26
5.5 Relationships between errors and safety measures .26
5.6 Data integrity considerations .27
5.6.1 Calculation of the residual error rate.27
5.6.2 Residual error rate and SIL.29
5.7 Relationship between functional safety and security .29
5.8 Boundary conditions and constraints .30
5.8.1 Electrical safety.30
5.8.2 Electromagnetic compatibility (EMC) .30
5.9 Installation guidelines.30
5.10 Safety manual .30
5.11 Safety policy .30
6 Communication Profile Family 1 (FOUNDATION™ Fieldbus) – Profiles for functional
safety .31
6.1 Functional Safety Communication Profile 1/1.31
6.2 Technical overview.31
7 Communication Profile Family 2 (CIP™) – Profiles for functional safety.32
7.1 Functional Safety Communication Profile 2/1.32
7.2 Technical overview.32
8 Communication Profile Family 3 (PROFIBUS™, PROFINET™) – Profiles for
functional safety .34
8.1 Functional Safety Communication Profile 3/1.34
8.2 Technical overview.34
9 Communication Profile Family 6 (INTERBUS®) – Profiles for functional safety .36
9.1 Functional Safety Communication Profile 6/7.36
9.2 Technical overview.37
10 Communication Profile Family 8 (CC-Link™) – Profiles for functional safety .38
10.1 Functional Safety Communication Profile 8/1.38
10.2 Technical overview.38
11 Communication Profile Family 12 (EtherCAT™) – Profiles for functional safety .39
11.1 Functional Safety Communication Profile 12/1.39
11.2 Technical overview.39
12 Communication Profile Family 13 (Ethernet POWERLINK™) – Profiles for
functional safety .40
12.1 Functional Safety Communication Profile 13/1.40
12.2 Technical overview.40
13 Communication Profile Family 14 (EPA®) – Profiles for functional safety.41
13.1 Functional Safety Communication Profile 14/1.41
13.2 Technical overview.42
Annex A (informative) Example functional safety communication models .43
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– 4 – 61784-3 © IEC:2010(E)
A.1 General .43
A.2 Model A.43
A.3 Model B.43
A.4 Model C.44
A.5 Model D.44
Annex B (informative) A safety communication channel model using CRC-based error
checking .46
B.1 Overview .46
B.2 Channel model for calculations.46
B.3 Cyclic redundancy checking .47
B.3.1 General .47
B.3.2 Considerations concerning CRC polynomials .49
Annex C (informative) Structure of technology-specific parts .51
Annex D (informative) Assessment guideline .53
D.1 Overview .53
D.2 Channel types .53
D.2.1 General .53
D.2.2 Black channel.53
D.2.3 White channel .53
D.3 Data integrity considerations for white channel approaches.54
D.3.1 General .54
D.3.2 Model B and C .54
D.3.3 Model A and D .55
D.4 Verification of safety measures.55
D.4.1 General .55
D.4.2 Implementation .56
D.4.3 "De-energize to trip" principle .56
D.4.4 Safe state .56
D.4.5 Transmission errors.56
D.4.6 Safety reaction and response times .56
D.4.7 Combination of measures .56
D.4.8 Absence of interference.57
D.4.9 Additional fault causes (white channel) .57
D.4.10 Reference test beds and operational conditions.57
D.4.11 Conformance tester .57
Bibliography.58
Table 1 – Overview of the effectiveness of the various measures on the possible errors.27
Table 2 – Definition of items used for calculation of the residual error rate.28
Table 3 – Relationship of residual error rate to SIL level .29
Table 4 – Overview of profile identifier usable for FSCP 6/7.37
Table B.1 – Example dependency d and block length n.49
min
Table C.1 – Common subclause structure for technology-specific parts .51
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61784-3 © IEC:2010(E) – 5 –
Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) .8
Figure 2 – Relationships of IEC 61784-3 with other standards (process).9
Figure 3 – Safety communication as a part of a safety function.21
Figure 4 – Example model of a functional safety communication system .22
Figure 5 – Example of safety function response time components.23
Figure 6 – Example application .29
Figure 7 – Scope of FSCP 1/1 .32
Figure 8 – Relationship of Safety Validators .33
Figure 9 – Basic communication preconditions for FSCP 3/1 .35
Figure 10 – Structure of a FSCP 3/1 safety PDU.35
Figure 11 – Safe communication modes.36
Figure 12 – FSCP 6/7 communication preconditions .37
Figure 13 – Basic FSCP 12/1 system .39
Figure 14 – Producer consumer example .41
Figure 15 – Client server example .41
Figure 16 – FSCP 14/1 safety communication architecture .42
Figure A.1 – Model A .43
Figure A.2 – Model B .44
Figure A.3 – Model C .44
Figure A.4 – Model D .45
Figure B.1 – Communication channel with perturbation.46
Figure B.2 – Binary symmetric channel (BSC).47
Figure B.3 – Example of a block with message and CRC bits (redundancy code).48
Figure B.4 – Block codes for error detection .48
Figure B.5 – Proper and improper CRC polynomials .49
Figure D.1 – Basic Markov model .55
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– 6 – 61784-3 © IEC:2010(E)
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
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6) All users should ensure that they have the latest edition of this publication.
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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.
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 second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision. The main changes with respect to the previous edition are
listed below:
– clarifications and additional explanations for requirements, updated references;
– updates of definitions and requirements in relation with the new edition of IEC 61508;
– addition of a new informative Annex D providing an assessment guideline;
– updates in parts for CPF 1, CPF 2, CPF 3, CPF 6 (details provided in the parts);
– addition of new parts for CPF 8, CPF 12, CPF 13, CPF 14;
– in CPF parts, addition of an annex to provide information about test laboratories for
testing and validating conformance of FSCP products.
---------------------- Page: 8 ----------------------
61784-3 © IEC:2010(E) – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
65C/591A/FDIS 65C/603/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.
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 publication will remain unchanged until
the stability 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
---------------------- Page: 9 ----------------------
– 8 – 61784-3 © IEC:2010(E)
0 Introduction
0.1 General
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 61800-5-2 ISO 10218-1 Safety of machinery – Principles for
IEC 61131-6
IEC 61496 IEC 61131-6 IEC 61800-5-2 ISO 10218-1 Safety of machinery – Principles for
Safety f. e.g. Safety functions Safety requirements design and risk assessment
Safety for PLC design and risk assessment
Safety f. e.g. Safety for PLC Safety functions Safety requirements
light curtains (under consideration) for drives for robots
(under consideration)
light curtains for drives for robots
Design of safety-related electrical, electronic and program-
IEC 61784-4 IEC 62443
IEC 61784-4 IEC 62443
Security Security mable electronic control systems (SRECS) for machinery
Security Security
(profile-specific) (common part)
(profile-specific) (common part)
SIL based PL based
IEC 61784-5 IEC 61918
IEC 61784-5 IEC 61918
Installation guide Installation guide
Installation guide Installation guide Design objective
(profile-specific) (common part)
(profile-specific) (common part)
Applicable standards
ISO 13849-1, -2
ISO 13849-1, -2
IEC 60204-1
IEC 60204-1
Safety-related parts
Safety-related parts
Safety of electrical
Safety of electrical
IEC 61000-1-2
IEC 61000-1-2 of machinery
of machinery
equipment
equipment
Methodology EMC & FS
Methodology EMC & FS (SRPCS)
(SRPCS)
IEC 61326-3-1
IEC 61784-3
IEC 61784-3 IEC 61326-3-1
Non-electrical
Non-electrical
Functional safety Test EMC & FS
Functional safety Test EMC & FS
communication
communication
Electrical
Electrical
US: NFPA 79
US: NFPA 79
profi
...
IEC 61784-3
®
Edition 2.0 2010-06
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
IEC 61784-3:2010
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THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2010 IEC, Geneva, Switzerland
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IEC 61784-3
®
Edition 2.0 2010-06
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
PRICE CODE
INTERNATIONALE
XA
CODE PRIX
ICS 25.040.40; 35.100.05 ISBN 978-2-88912-810-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61784-3 IEC:2010
CONTENTS
FOREWORD . 6
0 Introduction . 8
0.1 General . 8
0.2 Patent declaration . 10
1 Scope . 11
2 Normative references . 11
3 Terms, definitions, symbols, abbreviated terms and conventions . 13
3.1 Terms and definitions . 13
3.1.1 Common terms and definitions . 13
3.1.2 CPF 1: Additional terms and definitions . 18
3.1.3 CPF 2: Additional terms and definitions . 18
3.1.4 CPF 3: Additional terms and definitions . 18
3.1.5 CPF 6: Additional terms and definitions . 18
3.1.6 CPF 8: Additional terms and definitions . 18
3.1.7 CPF 12: Additional terms and definitions . 18
3.1.8 CPF 13: Additional terms and definitions . 18
3.1.9 CPF 14: Additional terms and definitions . 18
3.2 Symbols and abbreviated terms. 19
3.2.1 Common symbols and abbreviated terms . 19
3.2.2 CPF 1: Additional symbols and abbreviated terms . 19
3.2.3 CPF 2: Additional symbols and abbreviated terms . 19
3.2.4 CPF 3: Additional symbols and abbreviated terms . 19
3.2.5 CPF 6: Additional symbols and abbreviated terms . 20
3.2.6 CPF 8: Additional symbols and abbreviated terms . 20
3.2.7 CPF 12: Additional symbols and abbreviated terms . 20
3.2.8 CPF 13: Additional symbols and abbreviated terms . 20
3.2.9 CPF 14: Additional symbols and abbreviated terms . 20
4 Conformance . 20
5 Basics of safety-related fieldbus systems . 21
5.1 Safety function decomposition . 21
5.2 Communication system . 21
5.2.1 General . 21
5.2.2 IEC 61158 fieldbuses . 21
5.2.3 Communication channel types . 22
5.2.4 Safety function response time . 22
5.3 Communication errors . 23
5.3.1 General . 23
5.3.2 Corruption . 23
5.3.3 Unintended repetition . 23
5.3.4 Incorrect sequence . 23
5.3.5 Loss . 24
5.3.6 Unacceptable delay . 24
5.3.7 Insertion . 24
5.3.8 Masquerade . 24
5.3.9 Addressing . 24
5.4 Deterministic remedial measures . 24
---------------------- Page: 4 ----------------------
61784-3 IEC:2010 – 3 –
5.4.1 General . 24
5.4.2 Sequence number . 25
5.4.3 Time stamp . 25
5.4.4 Time expectation . 25
5.4.5 Connection authentication . 25
5.4.6 Feedback message . 25
5.4.7 Data integrity assurance . 25
5.4.8 Redundancy with cross checking . 25
5.4.9 Different data integrity assurance systems . 26
5.5 Relationships between errors and safety measures . 26
5.6 Data integrity considerations . 27
5.6.1 Calculation of the residual error rate . 27
5.6.2 Residual error rate and SIL . 29
5.7 Relationship between functional safety and security . 29
5.8 Boundary conditions and constraints . 30
5.8.1 Electrical safety . 30
5.8.2 Electromagnetic compatibility (EMC) . 30
5.9 Installation guidelines . 30
5.10 Safety manual . 30
5.11 Safety policy . 30
6 Communication Profile Family 1 (FOUNDATION™ Fieldbus) – Profiles for functional
safety . 31
6.1 Functional Safety Communication Profile 1/1 . 31
6.2 Technical overview . 31
7 Communication Profile Family 2 (CIP™) – Profiles for functional safety . 32
7.1 Functional Safety Communication Profile 2/1 . 32
7.2 Technical overview . 32
8 Communication Profile Family 3 (PROFIBUS™, PROFINET™) – Profiles for
functional safety . 34
8.1 Functional Safety Communication Profile 3/1 . 34
8.2 Technical overview . 34
9 Communication Profile Family 6 (INTERBUS®) – Profiles for functional safety . 36
9.1 Functional Safety Communication Profile 6/7 . 36
9.2 Technical overview . 37
10 Communication Profile Family 8 (CC-Link™) – Profiles for functional safety . 38
10.1 Functional Safety Communication Profile 8/1 . 38
10.2 Technical overview . 38
11 Communication Profile Family 12 (EtherCAT™) – Profiles for functional safety . 39
11.1 Functional Safety Communication Profile 12/1 . 39
11.2 Technical overview . 39
12 Communication Profile Family 13 (Ethernet POWERLINK™) – Profiles for
functional safety . 40
12.1 Functional Safety Communication Profile 13/1 . 40
12.2 Technical overview . 40
13 Communication Profile Family 14 (EPA®) – Profiles for functional safety . 41
13.1 Functional Safety Communication Profile 14/1 . 41
13.2 Technical overview . 42
Annex A (informative) Example functional safety communication models . 43
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– 4 – 61784-3 IEC:2010
A.1 General . 43
A.2 Model A . 43
A.3 Model B . 43
A.4 Model C . 44
A.5 Model D . 44
Annex B (informative) A safety communication channel model using CRC-based error
checking . 46
B.1 Overview . 46
B.2 Channel model for calculations . 46
B.3 Cyclic redundancy checking . 47
B.3.1 General . 47
B.3.2 Considerations concerning CRC polynomials . 49
Annex C (informative) Structure of technology-specific parts . 51
Annex D (informative) Assessment guideline . 53
D.1 Overview . 53
D.2 Channel types . 53
D.2.1 General . 53
D.2.2 Black channel . 53
D.2.3 White channel . 53
D.3 Data integrity considerations for white channel approaches . 54
D.3.1 General . 54
D.3.2 Model B and C . 54
D.3.3 Model A and D . 55
D.4 Verification of safety measures . 55
D.4.1 General . 55
D.4.2 Implementation . 56
D.4.3 "De-energize to trip" principle . 56
D.4.4 Safe state . 56
D.4.5 Transmission errors . 56
D.4.6 Safety reaction and response times . 56
D.4.7 Combination of measures . 56
D.4.8 Absence of interference . 57
D.4.9 Additional fault causes (white channel) . 57
D.4.10 Reference test beds and operational conditions . 57
D.4.11 Conformance tester . 57
Bibliography . 58
Table 1 – Overview of the effectiveness of the various measures on the possible errors . 27
Table 2 – Definition of items used for calculation of the residual error rate . 28
Table 3 – Relationship of residual error rate to SIL level . 29
Table 4 – Overview of profile identifier usable for FSCP 6/7. 37
Table B.1 – Example dependency d and block length n . 49
min
Table C.1 – Common subclause structure for technology-specific parts . 51
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61784-3 IEC:2010 – 5 –
Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) . 8
Figure 2 – Relationships of IEC 61784-3 with other standards (process) . 9
Figure 3 – Safety communication as a part of a safety function . 21
Figure 4 – Example model of a functional safety communication system . 22
Figure 5 – Example of safety function response time components . 23
Figure 6 – Example application . 29
Figure 7 – Scope of FSCP 1/1 . 32
Figure 8 – Relationship of Safety Validators . 33
Figure 9 – Basic communication preconditions for FSCP 3/1 . 35
Figure 10 – Structure of a FSCP 3/1 safety PDU . 35
Figure 11 – Safe communication modes. 36
Figure 12 – FSCP 6/7 communication preconditions . 37
Figure 13 – Basic FSCP 12/1 system . 39
Figure 14 – Producer consumer example . 41
Figure 15 – Client server example . 41
Figure 16 – FSCP 14/1 safety communication architecture . 42
Figure A.1 – Model A . 43
Figure A.2 – Model B . 44
Figure A.3 – Model C . 44
Figure A.4 – Model D . 45
Figure B.1 – Communication channel with perturbation . 46
Figure B.2 – Binary symmetric channel (BSC) . 47
Figure B.3 – Example of a block with message and CRC bits (redundancy code) . 48
Figure B.4 – Block codes for error detection . 48
Figure B.5 – Proper and improper CRC polynomials . 49
Figure D.1 – Basic Markov model . 55
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– 6 – 61784-3 IEC:2010
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
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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.
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 second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision. The main changes with respect to the previous edition are
listed below:
– clarifications and additional explanations for requirements, updated references;
– updates of definitions and requirements in relation with the new edition of IEC 61508;
– addition of a new informative Annex D providing an assessment guideline;
– updates in parts for CPF 1, CPF 2, CPF 3, CPF 6 (details provided in the parts);
– addition of new parts for CPF 8, CPF 12, CPF 13, CPF 14;
– in CPF parts, addition of an annex to provide information about test laboratories for
testing and validating conformance of FSCP products.
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61784-3 IEC:2010 – 7 –
This bilingual version published in 2011-12, corresponds to the English version published
in 2010-07.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/591A/FDIS 65C/603/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.
The French version of this standard has not been voted upon.
This publication 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
website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch
...
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