IEC 61784-3-2:2010

Industrial communication networks - Profiles - Part 3-2: Functional safety fieldbuses - Additional specifications for CPF 2

IEC 61784 3-2:2010 specifies a safety communication layer (services and protocol) based on CPF 2 of IEC 61784-1, IEC 61784-2 and IEC 61158 Type 2. It identifies the principles for functional safety communications defined in IEC 61784-3 that are relevant for this safety communication layer. It defines mechanisms for 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 mechanisms may 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. It constitutes a technical revision. The main changes with respect to the previous edition are:
- updates in relation with changes in IEC 61784-3;
- addition or modification of the following subclauses to support the Extended Format: 6.3.2.1, 6.3.3.4, 6.3.11, 6.6.7.5, 6.8.5.13, 6.8.5.14, 7.1.1, 7.5.5, 7.6.10.10, 7.6.10.12, 8.2, 8.10.2.4.4, 9.5.2;
- modification of all pseudo code in 7.5 to support Extended Format;
- addition of Attribute 15 in 6.7.3.1;
- addition of subclauses 8.11, 8.12 and 8.13 to clarify requirements for CP 2/2, CP 2/3 and CP 16/3 respectively. This bilingual version published in 2011-11, corresponds to the English version published in 2010-07.

Réseaux de communication industriels - Profils - Partie 3-2: Bus de terrain de sécurité fonctionnelle - Spécifications supplémentaires pour CPF 2

La CEI 61784-3-2:2010 spécifie une couche de communication relative à la sécurité (services et protocole) fondée sur la CPF 2 de la CEI 61784-1, la CEI 61784-2 et le Type 2 de la CEI 61158. Elle identifie les principes applicables aux communications de sécurité fonctionnelle définies dans la CEI 61784-3, et appropriés à cette couche de communication de sécurité. Elle définit les mécanismes de transmission des messages relatifs 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 mécanismes 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 publiée en 2007. Elle constitue une révision technique. Les principales modifications par rapport à l'édition précédente sont:
- mises à jour par rapport aux changements apportés dans la CEI 61784-3;
- ajout ou modification des paragraphes suivants afin de prendre en charge le format étendu: 6.3.2.1, 6.3.3.4, 6.3.11, 6.6.7.5, 6.8.5.13, 6.8.5.14, 7.1.1, 7.5.5, 7.6.10.10, 7.6.10.12, 8.2, 8.10.2.4.4, 9.5.2;
- modification de tous les pseudo-codes en 7.5 afin de prendre en charge le format étendu;
- ajout de l'attribut 15 en 6.7.3.1;
- ajout des paragraphes 8.11, 8.12 et 8.13 afin de clarifier les exigences concernant les CP 2/2, CP 2/3 et CP 16/3 respectivement. La présente version bilingue, correspond à la version anglaise monolingue publiée en 2010-07.

General Information

• Status: Published
• Publication Date: 28-Jun-2010
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.05 - Multilayer applications
• Technical Committee: SC 65C - Industrial networks
• Drafting Committee: WG 12 - TC 65/SC 65C/WG 12
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 13-Jul-2016

Relations

• Revises: IEC 61784-3-2:2007 - Industrial communication networks - Profiles - Part 3-2: Functional safety fieldbuses - Additional specifications for CPF 2
• Effective Date: 05-Sep-2023
• Revised: IEC 61784-3-2:2016 - Industrial communication networks - Profiles - Part 3-2: Functional safety fieldbuses - Additional specifications for CPF 2
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61784-3-2 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Profiles –
Part 3-2: Functional safety fieldbuses – Additional specifications for CPF 2

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

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International Standards for all electrical, electronic and related technologies.

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IEC 61784-3-2 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Profiles –
Part 3-2: Functional safety fieldbuses – Additional specifications for CPF 2

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XH
ICS 25.040.40; 35.100.05 ISBN 978-2-88910-977-7
– 2 – 61784-3-2 © IEC:2010(E)
CONTENTS
FOREWORD.12
0 Introduction .14
0.1 General .14
0.2 Patent declaration .16
1 Scope.17
2 Normative references .17
3 Terms, definitions, symbols, abbreviated terms and conventions .18
3.1 Terms and definitions .18
3.1.1 Common terms and definitions .19
3.1.2 CPF 2: Additional terms and definitions .23
3.2 Symbols and abbreviated terms.23
3.2.1 Common symbols and abbreviated terms .23
3.2.2 CPF 2: Additional symbols and abbreviated terms .24
3.3 Conventions .25
4 Overview of FSCP 2/1 (CIP Safety™).25
4.1 General .25
4.2 FSCP 2/1 .25
5 General .26
5.1 External documents providing specifications for the profile.26
5.2 Safety functional requirements .27
5.3 Safety measures .27
5.4 Safety communication layer structure .28
5.5 Relationships with FAL (and DLL, PhL) .28
5.5.1 General .28
5.5.2 Data types .28
6 Safety communication layer services .29
6.1 Introduction .29
6.2 Connection object .29
6.2.1 General .29
6.2.2 Class attribute extensions .29
6.2.3 Service extensions .30
6.2.4 Explicit message response format for SafetyOpen and SafetyClose .30
6.3 Connection Manager object .31
6.3.1 General .31
6.3.2 ForwardOpen for safety .31
6.3.3 Safety network segment .33
6.3.4 Originator rules for calculating the connection parameter CRC .36
6.3.5 SafetyOpen processing flowcharts.36
6.3.6 Checks required by Multipoint producers with existing connections .39
6.3.7 Electronic key usage for safety.40
6.3.8 RPI vs. API in safety connections .40
6.3.9 Application path construction for safety .40
6.3.10 Safety Validator connection types.41
6.3.11 Application reply data in a successful SafetyOpen response.43
6.3.12 Unsuccessful SafetyOpen response .45
6.3.13 ForwardClose for safety.47

61784-3-2 © IEC:2010(E) – 3 –
6.4 Identity object.48
6.4.1 General .48
6.4.2 Changes to common services .48
6.5 Link objects .48
6.5.1 DeviceNet object changes .48
6.5.2 TCP/IP Interface object changes .49
6.6 Safety Supervisor object.49
6.6.1 General .49
6.6.2 Safety Supervisor class attributes.50
6.6.3 Subclasses.50
6.6.4 Safety Supervisor instance attributes.50
6.6.5 Semantics .53
6.6.6 Subclasses.60
6.6.7 Safety Supervisor common services .60
6.6.8 Safety Supervisor behavior.71
6.7 Safety Validator object .78
6.7.1 General .78
6.7.2 Class attributes .78
6.7.3 Instance attributes .79
6.7.4 Class services .84
6.7.5 Instance services.85
6.7.6 Object behavior .85
6.8 Connection Configuration Object .88
6.8.1 General .88
6.8.2 Class attribute extensions .88
6.8.3 Instance attributes, additions and extensions. .88
6.8.4 Instance attribute semantics extensions or restrictions for safety.90
6.8.5 Special Safety Related Parameters – (Attribute 13) .95
6.8.6 Object-specific services.101
6.8.7 Common service extensions for safety. 101
6.8.8 Object behavior .103
7 Safety communication layer protocol .104
7.1 Safety PDU format .104
7.1.1 Safety PDU encoding .104
7.1.2 Safety CRC .116
7.2 Communication protocol behavior.117
7.2.1 Sequence of safety checks .117
7.2.2 Connection termination. 117
7.2.3 Cross checking error .117
7.3 Time stamp operation.118
7.4 Protocol sequence diagrams .119
7.4.1 General .119
7.4.2 Normal safety transmission.119
7.4.3 Lost, corrupted and delayed message transmission. 120
7.4.4 Lost, corrupted or delayed message transmission with production
repeated.122
7.4.5 Point-to-point ping .124
7.4.6 Multipoint ping on CP 2/3 Safety.125
7.4.7 Multipoint ping on CP 2/2 safety networks .127

– 4 – 61784-3-2 © IEC:2010(E)
7.4.8 Multipoint ping – retry with success .127
7.4.9 Multipoint ping – retry with timeout .128
7.5 Safety protocol definition .129
7.5.1 General .129
7.5.2 High level view of a safety device .129
7.5.3 Safety Validator object .130
7.5.4 Relationship between SafetyValidatorServer and
SafetyValidatorClient .130
7.5.5 Extended Format time stamp rollover handling .131
7.5.6 SafetyValidatorClient function definition . 135
7.5.7 SafetyValidatorServer function definition .
...

IEC 61784-3-2 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles –
Part 3-2: Functional safety fieldbuses – Additional specifications for CPF 2

Réseaux de communication industriels – Profils –
Partie 3-2: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 2
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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IEC 61784-3-2 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles –
Part 3-2: Functional safety fieldbuses – Additional specifications for CPF 2

Réseaux de communication industriels – Profils –
Partie 3-2: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 2
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XH
CODE PRIX
ICS 25.040.40; 35.100.05 ISBN 978-2-88912-811-2
– 2 – 61784-3-2  IEC:2010
CONTENTS
FOREWORD . 12
0 Introduction . 14
0.1 General . 14
0.2 Patent declaration . 16
1 Scope . 17
2 Normative references . 17
3 Terms, definitions, symbols, abbreviated terms and conventions . 18
3.1 Terms and definitions . 18
3.1.1 Common terms and definitions . 19
3.1.2 CPF 2: Additional terms and definitions . 23
3.2 Symbols and abbreviated terms. 23
3.2.1 Common symbols and abbreviated terms . 23
3.2.2 CPF 2: Additional symbols and abbreviated terms . 24
3.3 Conventions . 25
4 Overview of FSCP 2/1 (CIP Safety™) . 25
4.1 General . 25
4.2 FSCP 2/1 . 25
5 General . 26
5.1 External documents providing specifications for the profile . 26
5.2 Safety functional requirements . 27
5.3 Safety measures . 27
5.4 Safety communication layer structure . 28
5.5 Relationships with FAL (and DLL, PhL) . 28
5.5.1 General . 28
5.5.2 Data types . 28
6 Safety communication layer services . 29
6.1 Introduction . 29
6.2 Connection object . 29
6.2.1 General . 29
6.2.2 Class attribute extensions . 29
6.2.3 Service extensions . 30
6.2.4 Explicit message response format for SafetyOpen and SafetyClose . 30
6.3 Connection Manager object . 31
6.3.1 General . 31
6.3.2 ForwardOpen for safety . 31
6.3.3 Safety network segment . 33
6.3.4 Originator rules for calculating the connection parameter CRC . 36
6.3.5 SafetyOpen processing flowcharts . 36
6.3.6 Checks required by Multipoint producers with existing connections . 39
6.3.7 Electronic key usage for safety . 40
6.3.8 RPI vs. API in safety connections . 40
6.3.9 Application path construction for safety . 40
6.3.10 Safety Validator connection types . 41
6.3.11 Application reply data in a successful SafetyOpen response . 43
6.3.12 Unsuccessful SafetyOpen response . 45

61784-3-2  IEC:2010 – 3 –
6.3.13 ForwardClose for safety . 47
6.4 Identity object . 48
6.4.1 General . 48
6.4.2 Changes to common services . 48
6.5 Link objects . 48
6.5.1 DeviceNet object changes . 48
6.5.2 TCP/IP Interface object changes . 49
6.6 Safety Supervisor object. 49
6.6.1 General . 49
6.6.2 Safety Supervisor class attributes . 50
6.6.3 Subclasses . 50
6.6.4 Safety Supervisor instance attributes . 50
6.6.5 Semantics . 53
6.6.6 Subclasses . 60
6.6.7 Safety Supervisor common services . 60
6.6.8 Safety Supervisor behavior . 71
6.7 Safety Validator object . 78
6.7.1 General . 78
6.7.2 Class attributes . 78
6.7.3 Instance attributes . 79
6.7.4 Class services . 84
6.7.5 Instance services . 85
6.7.6 Object behavior . 85
6.8 Connection Configuration Object . 88
6.8.1 General . 88
6.8.2 Class attribute extensions . 88
6.8.3 Instance attributes, additions and extensions. . 88
6.8.4 Instance attribute semantics extensions or restrictions for safety . 90
6.8.5 Special Safety Related Parameters – (Attribute 13) . 95
6.8.6 Object-specific services . 101
6.8.7 Common service extensions for safety . 101
6.8.8 Object behavior . 103
7 Safety communication layer protocol . 104
7.1 Safety PDU format . 104
7.1.1 Safety PDU encoding . 104
7.1.2 S
...