IEC 61784-1-8:2023

Industrial networks - Profiles - Part 1-8: Fieldbus profiles - Communication Profile Family 8

IEC 61784-1-8:2023 defines Communication Profile Family 8 (CPF 8). CPF 8 specifies a set of protocol specific communication profiles (CPs) based on the IEC 61158 series (Type 18 and Type 23) and other standards, to be used in the design of devices involved in communications in factory manufacturing and process control.

Réseaux industriels - Profils - Partie 1-8: Profils de bus de terrain - Famille de profils de communication 8

L’IEC 61784-1-8:2023 définit la famille de profils de communication 8 (CPF 8). La CPF 8 définit un jeu de profils de communication (CP) spécifiques au protocole, fondé sur la série IEC 61158 (type 18 et type 23) et d’autres normes, à utiliser pour la conception d’appareils employés en communication dans le cadre de la production industrielle et de la commande de processus.

General Information

• Status: Published
• Publication Date: 20-Mar-2023
• ICS: 35.100.20 - Data link layer
• ICS: 35.240.50 - IT applications in industry
• Technical Committee: SC 65C - Industrial networks
• Drafting Committee: WG 9 - TC 65/SC 65C/WG 9
• Current Stage: PPUB - Publication issued
• Start Date: 31-Mar-2023
• Completion Date: 21-Mar-2023

Relations

• Replaces: IEC 61784-1:2019 - Industrial communication networks - Profiles Part 1: Fieldbus profiles
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61784-1-8
®

Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial networks – Profiles –
Part 1-8: Fieldbus profiles – Communication Profile Family 8

Réseaux industriels – Profils –
Partie 1-8: Profils de bus de terrain – Famille de profils de communication 8

IEC 61784-1-8:2023-03(en-fr)

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IEC 61784-1-8

®


Edition 1.0 2023-03




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Industrial networks – Profiles –

Part 1-8: Fieldbus profiles – Communication Profile Family 8



Réseaux industriels – Profils –

Partie 1-8: Profils de bus de terrain – Famille de profils de communication 8
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 35.100.20; 35.240.50 ISBN 978-2-8322-6625-0




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 61784-1-8:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviated terms, symbols, and conventions . 8
3.1 Terms and definitions . 8
3.2 Abbreviations and symbols . 8
3.2.1 Common abbreviations and symbols . 8
3.2.2 Other abbreviations and symbols . 8
3.3 Conventions . 8
4 CPF 8 (CC-Link) . 8
4.1 General overview . 8
4.1.1 General . 8
4.1.2 Profile 8/1 . 9
4.1.3 Profile 8/2 . 9
4.1.4 Profile 8/3 . 9
4.2 CP 8/1 . 10
4.2.1 Physical layer . 10
4.2.2 Data-link layer . 11
4.2.3 Application layer . 14
4.3 CP 8/2 . 17
4.3.1 Physical layer . 17
4.3.2 Data-link layer . 17
4.3.3 Application layer . 17
4.4 CP 8/3 . 17
4.4.1 Physical layer . 17
4.4.2 Data-link layer . 19
4.4.3 Application layer . 21
Annex A (informative) CPF 8 (CC-LINK) communication concepts . 24
A.1 Basic characteristics . 24
A.1.1 Basic characteristics overview . 24
A.1.2 Initial cycle . 24
A.1.3 Refresh cycle . 24
A.1.4 Return cycle . 24
A.2 Variants . 24
Bibliography . 26

Table 1 – CP 8/1 transmission support level . 9
Table 2 – CP 8/1 PhL selection . 10
Table 3 – CP 8/1 DLL services selection . 12
Table 4 – CP 8/1 DLL protocol selection . 13
Table 5 – CP 8/1 AL services selection . 15
Table 6 – CP 8/1 AL protocol selection . 16
Table 7 – CP 8/2 DLL protocol selection . 17
Table 8 – CP 8/3 PhL selection . 18

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IEC 61784-1-8:2023 © IEC 2023 – 3 –
Table 9 – CP 8/3 DLL services selection . 19
Table 10 – CP 8/3 DLL protocol selection . 20
Table 11 – CP 8/3 AL services selection . 21
Table 12 – CP 8/3 AL protocol selection . 22

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– 4 – IEC 61784-1-8:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL NETWORKS –
PROFILES –

Part 1-8: Fieldbus profiles –
Communication Profile Family 8

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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 61784-1-8 has been prepared by subcommittee 65C: Industrial networks, of IEC technical
committee 65: Industrial-process measurement, control and automation. It is an International
Standard.
This first edition, together with the other parts of the same series, cancels and replaces the
fifth edition of IEC 61784-1 published in 2019. This first edition constitutes a technical
revision.

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IEC 61784-1-8:2023 © IEC 2023 – 5 –
This edition includes the following significant technical changes with respect to
IEC 61784-1:2019:
a) split of the original IEC 61784-1 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.
The text of this International Standard is based on the following documents:
Draft Report on voting
65C/1207/FDIS 65C/1236/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 61784-1 series, published under the general title Industrial
networks – Profiles – Part 1: Fieldbus profiles, 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 61784-1-8:2023 © IEC 2023
INTRODUCTION
The IEC 61784-1 series provides a set of Communication Profiles (CP) in the sense of
ISO/IEC TR 10000-1. These answer the need of identifying the protocol families co-existing
within the IEC 61158 series, as a result of the international harmonization of fieldbus
technologies available on the market. More specifically, these profiles help to correctly state
the compliance with the IEC 61158 series, and to avoid the spreading of divergent
implementations, which would limit its use, clearness and understanding. Additional profiles to
address specific market concerns, such as functional safety or information security, can be
addressed by future parts of the IEC 61784-1 series.
The IEC 61784-1 series contains several Communication Profile Families (CPF), which
specify one or more communication profiles. Such profiles identify, in a strict sense, protocol
subsets of the IEC 61158 series via protocol specific communication profiles. They do not
define device profiles that specify communication profiles together with application functions
needed to answer the need of a specific application ("application profiles").
It is agreed that these latter classes of profiles would facilitate the use of the IEC 61158
series of standards; the profiles defined in the IEC 61784-1 series are a necessary step to
achieve that task.
It is also important to clarify that interoperability – defined as the ability of two or more
network systems to exchange information and to make mutual use of the information that has
been exchanged (see ISO/IEC TR 10000-1) – can be directly achieved on the same link only
for those devices complying with the same communication profile.
Profiles contained in the IEC 61784-1 series are constructed of references to IEC 61158-2
and the IEC 61158-3, IEC 61158-4, IEC 61158-5 and IEC 61158-6 series, and other IS, TS or
1
worldwide-accepted standards, as appropriate . Each profile is required to reference at least
one part of the IEC 61158 series in addition to IEC 61158-1.
Two or more Profiles, which are related to a common family, are specified within a
"Communication Profile Family" (CPF).


___________
1
 International Standardised Profiles may contain normative references to specifications other than International
Standards; see ISO/IEC JTC 1 N 4047: The Normative Referencing of Specifications other than International
Standards in JTC 1 International Standardized Profiles – Guidelines for ISP Submitters.

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IEC 61784-1-8:2023 © IEC 2023 – 7 –
INDUSTRIAL NETWORKS –
PROFILES –

Part 1-8: Fieldbus profiles –
Communication Profile Family 8



1 Scope
This part of IEC 61784-1 defines Communication Profile Family 8 (CPF 8). CPF 8 specifies a
set of protocol specific communication profiles (CPs) based on the IEC 61158 series (Type 18
and Type 23) and other standards, to be used in the design of devices involved in
communications in factory manufacturing and process control.
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 Some CPs of CPF 8 are specified in IEC 61784-2-8.
Each CP selects an appropriate consistent and compatible subset of services and protocols
from the relevant set that is defined and modelled in the IEC 61158 series. For the selected
subset of services and protocols, the profile also describes any possible or necessary
constraints in parameter values.
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 61158-2:2023, Industrial communication networks – Fieldbus specifications – Part 2:
Physical layer specification and service definition
IEC 61158-3-18:2007, Industrial communication networks – Fieldbus specifications –
Part 3-18: Data-link layer service definition – Type 18 elements
IEC 61158-4-18:2010, Industrial communication networks – Fieldbus specifications –
Part 4-18: Data-link layer protocol specification – Type 18 elements
IEC 61158-5-18:2010, Industrial communication networks – Fieldbus specifications –
Part 5-18: Application layer service definition – Type 18 elements
IEC 61158-6-18:2010, Industrial communication networks – Fieldbus specifications –
Part 6-18: Application layer protocol specification – Type 18 elements
IEC 61784-1-0:2023, Industrial networks – Profiles – Part 1-0: Fieldbus profiles – General
concepts and terminology

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– 8 – IEC 61784-1-8:2023 © IEC 2023
ISO/IEC 8482, Information technology – Telecommunications and information exchange
between systems – Twisted pair multipoint interconnections
TIA-485-A:1998, Electrical Characteristics of Generators and Receivers for Use in Balanced
Digital Multipoint Systems
3 Terms, definitions, abbreviated terms, symbols, and conventions
3.1 Terms and definitions
For the purposes of this document, all terms and definitions provided in the IEC 61158 series
and IEC 61784-1-0 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 Abbreviations and symbols
3.2.1 Common abbreviations and symbols
For the purposes of this document, all abbreviations and symbols defined in the IEC 61158
series and IEC 61784-1-0 apply.
CP communication profile
CPF communication profile family
MAU medium attachment unit
3.2.2 Other abbreviations and symbols
RS 485 MAU according to TIA-485-A
3.3 Conventions
For the purposes of this document, the conventions defined in IEC 61784-1-0 apply.
2
4 CPF 8 (CC-Link )
4.1 General overview
4.1.1 General
Communication Profile Family 8 (CPF8) defines communication profiles based on
IEC 61158-2 type 18, IEC 61158-3-18, IEC 61158-4-18, IEC 61158-5-18 and IEC 61158-6-18,
which corresponds to parts of the communication systems commonly known as CC-Link.
CPF 8 consists of three profile sets:
a) Profile 8/1 – CC-Link/V1
___________
2
 CC-Link Logo is the registered trademark of CC-Link Partners Association (CLPA). CLPA is a non-profit trade
organization to support the fieldbus CC-Link. This information is given for the convenience of users of this
document and does not constitute an endorsement by IEC of the trademark holder or any of its products.
Compliance with this profile does not require use of the registered trademark. Use of the registered trademark
CC-Link Logo requires permission of the trade name holder.

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IEC 61784-1-8:2023 © IEC 2023 – 9 –
b) Profile 8/2 – CC-Link/V2
c) Profile 8/3 – CC-Link/LT
Common to all CPF 8 profiles, there are two fundamental device types defined: Master
devices and Slave devices.
Master devices determine the data communication on the bus; only a Master device is able to
initiate transmissions on the bus.
Slave devices are field devices such as I/O devices, valves, drives and measuring
transducers. Slave devices are assigned to a Master device as a provider for cyclic I/O data
exchange, and optionally, acyclic messaging. A Slave device is not able to initiate
transmissions on the bus, it only responds to requests from a Master device.
Each device is considered a station and is identified on the network by its station identifier.
The addressing space for devices on the network is mapped as sequential numbers called
slot identifiers. A device is configured to occupy one or more slots as specified by its station
identifier (the first slot occupied) and its number of occupied slots (sequentially numbered
slots in the network’s address space).
NOTE See Annex A for an overview of CC-LINK communications concepts.
4.1.2 Profile 8/1
CP 8/1 defines a transmission method named Polled which uses the:
polled response access protocol – the transmission of data managed by the process of a
Master individually interrogating each Slave in sequence called scanning. A Slave device
transmits a response immediately upon receipt of an explicitly coded poll request addressed
to the Slave station from the Master station.
There are three fundamental types of Slave station specified, each identified by their
transmission support level as shown in Table 1.
Table 1 – CP 8/1 transmission support level
Word-
Transmission Bit-oriented
Commonly named Slave device type oriented Acyclic
support level cyclic
cyclic
A Remote I/O station YES NO NO
B Remote device station YES YES NO
C Intelligent device station YES YES YES

The PhL specifies a balanced transmission signal over a shielded 3-core twisted cable.
Communication data rates as high as 10 mbps and transmission distances as long as 1 200 m
are specified. CP 8/1 implements an MAU compliant with ISO/IEC 8482 Twisted Pair
Multipoint Interconnections, and a derivative of TIA-485-A.
4.1.3 Profile 8/2
CP 8/2 is the same as CP 8/1 but adds segmenting capabilities to the cyclic data transfer,
using a technique called extended frames. Devices that support this profile are labelled as
compliant with CC-Link V2.
4.1.4 Profile 8/3
CP 8/3 defines a transmission method named Packed which uses the:

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– 10 – IEC 61784-1-8:2023 © IEC 2023
packed response access protocol – the transmission of data managed by the process of a
Master broadcasting a trigger message whereupon each Slave waits a time period unique to
its station identifier, then transmits its response. This results in a time-sliced packed response
frame from all Slaves triggered by a single Master request.
The PhL is a powered-bus that specifies a balanced transmission signal over a 4-core
unshielded cable in both flat and round configurations with conductors specified for
communications signal as well as network-embedded power distribution.
Communication data rates as high as 2,5 mbps and transmission distances as long as 500 m
are specified. CP 8/3 implements a MAU compliant with ISO/IEC 8482 Twisted Pair Multipoint
Interconnections, and is a derivative of TIA-485-A.
4.2 CP 8/1
4.2.1 Physical layer
Table 2 specifies the PhL selection within IEC 61158-2 for devices of all types of this profile.
Table 2 – CP 8/1 PhL selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references Partial Relevant references only
3 Terms and definitions — —
3.1 Common terms and definitions Partial Relevant definitions only
3.2 – 3.9 — NO —
3.10 Type 18: Terms and definitions YES —
Next
— NO —
subclauses
4 Symbols and abbreviated terms — —
4.1 Symbols — —
4.1.1 – 4.1.8 — NO —
4.1.9 Type 18: Symbols YES —
Next — NO —
subclauses
4.2 Abbreviated terms — —
4.2.1 – 4.2.8 — NO —
4.2.9 Type 18: Abbreviations YES —
Next — NO —
subclauses
5 DLL – PhL interface — —
5.1 General YES —
5.2 – 5.9 — NO —
5.10 Type 18: Required
...