IEC 61784-2-8:2023
(Main)Industrial networks - Profiles - Part 2-8: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 - CPF 8
Industrial networks - Profiles - Part 2-8: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 - CPF 8
IEC 61784-2-8:2023 defines extensions of Communication Profile Family 8 (CPF 8) for Real-Time Ethernet (RTE). CPF 8 specifies a set of Real-Time Ethernet (RTE) communication profiles (CPs) and related network components based on the IEC 61158 series (Type 23), ISO/IEC/IEEE 8802-3 and other standards.
Réseaux industriels - Profils - Partie 2-8: Profils de bus de terrain supplémentaires pour les réseaux en temps réel fondés sur l’ISO/IEC/IEEE 8802-3 - CPF 8
L’IEC 61784-2-8:2023 définit les extensions de la famille de profils de communication 8 (CPF 8) pour l’Ethernet en temps réel (RTE). La CPF 8 spécifie un jeu de profils de communication (CP) Ethernet en temps réel (RTE) et les composants de réseau connexes basés sur la série IEC 61158 (type 23), l’ISO/IEC/IEEE 8802-3 et d’autres normes.
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IEC 61784-2-8
®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial networks – Profiles –
Part 2-8: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –
CPF 8
Réseaux industriels – Profils –
Partie 2-8: Profils de bus de terrain supplémentaires pour les réseaux en temps
réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 8
IEC 61784-2-8:2023-03(en-fr)
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IEC 61784-2-8
®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial networks – Profiles –
Part 2-8: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –
CPF 8
Réseaux industriels – Profils –
Partie 2-8: Profils de bus de terrain supplémentaires pour les réseaux en temps
réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 8
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 35.100.20; 35.240.50 ISBN 978-2-8322-6695-3
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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61784-2-8:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviated terms, acronyms, and conventions . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms and acronyms . 8
3.3 Symbols . 9
3.4 Conventions . 9
4 CPF 8 (CC-Link) – RTE communication profiles . 9
4.1 General overview . 9
4.2 CP 8/4 . 9
4.2.1 Physical layer . 9
4.2.2 Data link layer . 9
4.2.3 Application layer . 10
4.2.4 Performance indicator selection . 11
4.3 CP 8/5 . 17
4.3.1 Physical layer . 17
4.3.2 Data link layer . 17
4.3.3 Application layer . 17
4.3.4 Performance indicator selection . 19
4.4 CP 8/6 . 25
4.4.1 Physical layer . 25
4.4.2 Data link layer . 25
4.4.3 Application layer . 26
4.4.4 Performance indicator selection . 27
Bibliography . 32
Table 1 – CP 8/4: AL service selection . 10
Table 2 – CP 8/4: AL protocol selection . 11
Table 3 – CP 8/4: PI overview . 11
Table 4 – CP 8/4: PI dependency matrix . 12
Table 5 – CP 8/4: Consistent set of PIs (real-time only) . 16
Table 6 – CP 8/4: Consistent set of PIs (real-time and non-real-time) . 17
Table 7 – CP 8/5: AL service selection . 18
Table 8 – CP 8/5: AL protocol selection . 19
Table 9 – CP 8/5: PI overview . 19
Table 10 – CP 8/5: PI dependency matrix . 20
Table 11 – CP 8/5: Consistent set of PIs (real-time only) . 25
Table 12 – CP 8/5: Consistent set of PIs (real-time and non-real-time) . 25
Table 13 – CP 8/6: AL service selection . 26
Table 14 – CP 8/6: AL protocol selection . 27
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IEC 61784-2-8:2023 © IEC 2023 – 3 –
Table 15 – CP 8/6: Performance indicator overview . 28
Table 16 – CP 8/6: Performance indicator dependency matrix . 28
Table 17 – CP 8/6: Range of performance indicators . 31
Table 18 – CP 8/6: Consistent set of performance indicators . 31
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– 4 – IEC 61784-2-8:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL NETWORKS –
PROFILES –
Part 2-8: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 8
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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.
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.
Attention is drawn to the fact that the use of some of the associated protocol types is
restricted by their intellectual-property-right holders. In all cases, the commitment to limited
release of intellectual-property-rights made by the holders of those rights permits a layer
protocol type to be used with other layer protocols of the same type, or in other type
combinations explicitly authorized by their respective intellectual property right holders.
NOTE Combinations of protocol types are specified in the IEC 61784-1 series and the IEC 61784-2 series.
IEC 61784-2-8 has been prepared by subcommittee 65C: Industrial networks, of IEC technical
committee 65: Industrial-process measurement, control and automation. It is an International
Standard.
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IEC 61784-2-8:2023 © IEC 2023 – 5 –
This first edition, together with the other parts of the same series, cancels and replaces the
fourth edition of IEC 61784-2 published in 2019. This first edition constitutes a technical
revision.
This edition includes the following significant technical changes with respect to
IEC 61784-2:2019:
a) split of the original IEC 61784-2 into several subparts, one subpart for the material of a
generic nature, and one subpart for each Communication Profile Family specified in the
original document;
b) addition of profile CP 8/6.
The text of this International Standard is based on the following documents:
Draft Report on voting
65C/1209/FDIS 65C/1237/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/publications.
A list of all parts of the IEC 61784-2 series, published under the general title
Industrial networks – Profiles – Part 2: Additional real-time fieldbus profiles based on
ISO/IEC/IEEE 8802-3, 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 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.
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– 6 – IEC 61784-2-8:2023 © IEC 2023
INTRODUCTION
The IEC 61784-2 series provides additional Communication Profiles (CP) to the existing
Communication Profile Families (CPF) of the IEC 61784-1 series and additional CPFs with
one or more CPs. These profiles meet the industrial automation market objective of identifying
Real-Time Ethernet (RTE) communication networks coexisting with ISO/IEC/IEEE 8802-3 –
commonly known as Ethernet. These RTE communication networks use provisions of
ISO/IEC/IEEE 8802-3 for the lower communication stack layers and additionally provide more
predictable and reliable real-time data transfer and means for support of precise
synchronization of automation equipment.
More specifically, these profiles help to correctly state the compliance of RTE communication
networks with ISO/IEC/IEEE 8802-3, and to avoid the spreading of divergent implementations.
Adoption of Ethernet technology for industrial communication between controllers and even
for communication with field devices promotes the use of Internet technologies in the field
area. This availability would be unacceptable if it causes the loss of features required in the
field area for industrial communication automation networks, such as:
• real-time,
• synchronized actions between field devices like drives,
• efficient, frequent exchange of very small data records.
These new RTE profiles can take advantage of the improvements of Ethernet networks in
terms of transmission bandwidth and network span.
Another implicit but essential requirement is that the typical Ethernet communication
capabilities, as used in the office world, are fully retained, so that the software involved
remains applicable.
The market is in need of several network solutions, each with different performance
characteristics and functional capabilities, matching the diverse application requirements.
RTE performance indicators, whose values will be provided with RTE devices based on
communication profiles specified in the IEC 61784-2 series, enable the user to match network
devices with application-dependent performance requirements of an RTE network.
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IEC 61784-2-8:2023 © IEC 2023 – 7 –
INDUSTRIAL NETWORKS –
PROFILES –
Part 2-8: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 8
1 Scope
This part of IEC 61784-2 defines extensions of Communication Profile Family 8 (CPF 8) for
Real-Time Ethernet (RTE). CPF 8 specifies a set of Real-Time Ethernet (RTE) communication
profiles (CPs) and related network components based on the IEC 61158 series (Type 23),
ISO/IEC/IEEE 8802-3 and other standards.
For each RTE communication profile, this document also specifies the relevant RTE
performance indicators and the dependencies between these RTE performance indicators.
NOTE 1 All CPs are based on standards or draft standards or International Standards published by the IEC or on
standards or International Standards established by other standards bodies or open standards processes.
NOTE 2 The RTE communication profiles use ISO/IEC/IEEE 8802-3 communication networks and its related
network components and in some cases amend those standards to obtain RTE features.
NOTE 3 Some CPs of CPF 8 are specified in IEC 61784-1-8.
2 Normative references
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 All parts of the IEC 61158 series, as well as the IEC 61784-1 series and the IEC 61784-2 series, are
maintained simultaneously. Cross-references to these documents within the text therefore refer to the editions as
dated in this list of normative references.
IEC 61158 (all parts), Industrial communication networks – Fieldbus specifications
IEC 61158-5-23:2023, Industrial communication networks – Fieldbus specifications –
Part 5-23: Application layer service definition – Type 23 elements
IEC 61158-6-23:2023, Industrial communication networks – Fieldbus specifications –
Part 6-23: Application layer protocol specification – Type 23 elements
IEC 61784-2-0:2023, Industrial networks – Profiles – Part 2-0: Additional real-time fieldbus
profiles based on ISO/IEC/IEEE 8802-3 – General concepts and terminology
IEC 61784-5-8, Industrial communication networks – Profiles – Part 5-8: Installation of
fieldbuses – Installation profiles for CPF 8
ISO/IEC/IEEE 8802-3, Telecommunications and exchange between information technology
systems – Requirements for local and metropolitan area networks – Part 3: Standard for
Ethernet
---------------------- Page: 9 ----------------------
– 8 – IEC 61784-2-8:2023 © IEC 2023
IEEE Std 802-2014, IEEE Standard for Local and Metropolitan Area Networks: Overview and
Architecture
IEEE Std 802.1AB-2016, IEEE Standard for Local and metropolitan area networks – Station
and Media Access Control Connectivity Discovery
IEEE Std 802.1AS-2020, IEEE Standard for Local and Metropolitan Area Networks – Timing
and Synchronization for Time-Sensitive Applications
IEEE Std 802.1Q-2018, IEEE Standard for Local and Metropolitan Area Networks – Bridges
and Bridged Networks
IEEE Std 1588-2019, IEEE Standard for a Precision Clock Synchronization Protocol for
Networked Measurement and Control Systems
IETF RFC 768, J. Postel, User Datagram Protocol, August 1980, available at
https://www.rfc-editor.org/info/rfc768 [viewed 2022-02-18]
IETF RFC 791, J. Postel, Internet Protocol, September 1981, available at
https://www.rfc-editor.org/info/rfc791 [viewed 2022-02-18]
IETF RFC 792, J. Postel, Internet Control Message Protocol, September 1981, available at
https://www.rfc-editor.org/info/rfc792 [viewed 2022-02-18]
IETF RFC 793, J. Postel, Transmission Control Protocol, September 1981, available at
https://www.rfc-editor.org/info/rfc793 [viewed 2022-02-18]
3 Terms, definitions, abbreviated terms, acronyms, and conventions
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61784-2-0,
ISO/IEC/IEEE 8802-3, IEEE Std 802-2014, IEEE Std 802.1AB-2016, IEEE Std 802.1AS-2020
and IEEE Std 802.1Q-2018 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Abbreviated terms and acronyms
For the purposes of this document, abbreviated terms and acronyms defined in IEC 61784-2-0
and the following apply.
CP Communication Profile [according to IEC 61784-1-0]
CPF Communication Profile Family [according to IEC 61784-1-0]
ICMP Internet Control Message Protocol (see IETF RFC 792)
IETF Internet Engineering Task Force
IP Internet Protocol (see IETF RFC 791)
LLDP Link Layer Discovery Protocol (see IEEE Std 802.1AB-2016)
n.a. Not applicable
PI Performance indicator
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IEC 61784-2-8:2023 © IEC 2023 – 9 –
RSTP Rapid Spanning Tree Algorithm and Protocol (see IEEE Std 802.1Q-2018)
TCP Transmission Control Protocol (see IETF RFC 793)
UDP User Datagram Protocol (see IETF RFC 768)
3.3 Symbols
For the purposes of this document, symbols defined in IEC 61784-2-0 apply.
3.4 Conventions
For the purposes of this document, the conventions defined in IEC 61784-2-0 apply.
4 CPF 8 (CC-Link) – RTE communication profiles
4.1 General overview
Communication Profile Family 8 defines profiles based on ISO/IEC/IEEE 8802-3,
IEC 61158-5-23 and IEC 61158-6-23, which specify the communication system protocols
1
commonly known as CC-Link IE .
In this document, the following communication profiles are specified for CPF 8:
– Profile 8/4
a profile using fiber optic cable in a ring topology or copper cable in linear and star
topologies (CC-Link IE Control Network)
– Profile 8/5
a profile using copper cable in linear and star topologies (CC-Link IE Field Network).
– Profile 8/6
a profile using fiber optic cable in a ring topology or copper cable in linear and star
topologies (CC-Link IE TSN).
4.2 CP 8/4
4.2.1 Physical layer
The physical layer of CP 8/4 is as specified in ISO/IEC/IEEE 8802-3.
The bit rate shall be 1 000 Mbit/s. The full duplex and the auto negotiation function shall not
be used.
Recommended connectors, cables and installation guidelines are specified in IEC 61784-5-8.
4.2.2 Data link layer
The data link layer of CP 8/4 is as specified in ISO/IEC/IEEE 8802-3.
___________
1
CC-Link™ and CC-Link IE™ are trade names of Mitsubishi Electric Co. This information is given for the
convenience of users of this document and does not constitute an endorsement by IEC of the trade name
holder or any of its products. Compliance with this document does not require use of the trade names CC-
Link™ or CC-Link IE™. Use of the trade names CC-Link™ or CC-Link IE™ requires permission of CC-Link
Partner Association.
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4.2.3 Application layer
4.2.3.1 AL service selection
Application Layer services are defined in IEC 61158-5-23. Table 1 shows the subclauses
included in this profile.
Table 1 – CP 8/4: AL service selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references YES —
3 Terms, definitions, symbols, abbreviated terms and YES —
conventions
4 Concept YES —
5 Data type ASE YES —
6 Communication model specification — —
6.1 Communication model YES —
6.2 ASE — —
6.2.1 Overview type C YES —
6.2.2 Overview type F NO —
6.2.3 Cyclic data ASE type C YES —
6.2.4 Cyclic data ASE type F NO —
6.2.5 Acyclic data ASE type C YES —
6.2.6 Acyclic data ASE type F NO —
6.2.7 Management ASE YES —
6.2.8 Synchronization ASE NO —
6.2.9 Measurement ASE YES —
6.3 AR Type C YES —
6.4 AR Type F NO —
4.2.3.2 AL protocol selection
Application Layer protocols are defined in IEC 61158-6-23. Table 2 shows the subclauses
included in this profile.
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IEC 61784-2-8:2023 © IEC 2023 – 11 –
Table 2 – CP 8/4: AL protocol selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references YES —
3 Terms, definitions, symbols, abbreviated terms and YES —
conventions
4 FAL syntax description — —
4.1 FALPDU type C abstract syntax YES —
4.2 FALPDU type F abstract syntax NO —
4.3 Data assignmentds for type C YES —
4.4 Data assignmentds for type F NO —
5 FAL transfer syntax — —
5.1 Encoding rules YES —
5.2 FALPDU type C elements encoding YES —
5.3 FALPDU type F elements encoding NO —
6 Structure of the FAL protocol state machine YES —
7 FAL service protocol machine (FSPM) — —
7.1 Overview YES —
7.2 FSPM type C YES —
7.3 FSPM type F NO —
8 Application relationship protocol machine (ARPM) — —
8.1 ARPM type C YES —
8.2 ARPM type F NO —
9 DLL mapping protocol machine (DMPM) — —
9.1 DMPM type C YES —
9.2 DMPM type F NO —
4.2.4 Performance indicator selection
4.2.4.1 Performance indicator overview
Table 3 provides an overview of the CP 8/4 performance indicators.
Table 3 – CP 8/4: PI overview
Performance indicator Applicable Constraints
Delivery time YES —
Number of end-stations YES —
Basic network topology YES —
Number of switches between end-stations YES —
Throughput RTE YES —
Non-RTE bandwidth YES —
Time synchronization accuracy NO —
Non-time-based synchronization accuracy NO —
Redundancy recovery time YES —
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4.2.4.2 Performance indicator dependencies
Table 4 specifies the dependencies of the pe
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