IEC 61784-1-16:2023

IEC 61784-1-16 ®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial networks – Profiles –
Part 1-16: Fieldbus profiles – Communication Profile Family 16

Réseaux industriels – Profils –
Partie 1-16: Profils de bus de terrain – Famille de profils de communication 16

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, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Découvrez notre puissant moteur de recherche et consultez
webstore.iec.ch/advsearchform gratuitement tous les aperçus des publications. Avec un
La recherche avancée permet de trouver des publications IEC abonnement, vous aurez toujours accès à un contenu à jour
en utilisant différents critères (numéro de référence, texte, adapté à vos besoins.
comité d’études, …). Elle donne aussi des informations sur les
projets et les publications remplacées ou retirées. Electropedia - www.electropedia.org

Le premier dictionnaire d'électrotechnologie en ligne au monde,
IEC Just Published - webstore.iec.ch/justpublished
avec plus de 22 300 articles terminologiques en anglais et en
Restez informé sur les nouvelles publications IEC. Just
français, ainsi que les termes équivalents dans 19 langues
Published détaille les nouvelles publications parues.
additionnelles. Egalement appelé Vocabulaire
Disponible en ligne et une fois par mois par email.
Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC Products & Services Portal - products.iec.ch

IEC 61784-1-16 ®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial networks – Profiles –

Part 1-16: Fieldbus profiles – Communication Profile Family 16

Réseaux industriels – Profils –

Partie 1-16: Profils de bus de terrain – Famille de profils de communication 16

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 35.100.20; 35.240.50 ISBN 978-2-8322-6592-5

– 2 – IEC 61784-1-16:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, abbreviated terms, symbols, and conventions . 7
3.1 Terms and definitions . 7
3.2 Abbreviations and symbols . 7
3.2.1 Common abbreviations and symbols . 7
3.2.2 Other abbreviations and symbols . 7
3.3 Conventions . 7
4 CPF 16 (SERCOS) . 8
4.1 General overview . 8
4.2 CP 16/1 (SERCOS I) . 8
4.2.1 Physical layer selection . 8
4.2.2 Data-link layer . 10
4.2.3 Application layer . 10
4.3 CP 16/2 (SERCOS II) . 10
4.3.1 Physical layer . 10
4.3.2 Data-link layer . 12
4.3.3 Application layer . 12
Annex A (informative) CPF 16 (SERCOS) communication concepts . 13
Bibliography . 15

Figure A.1 – Ring structure . 13
Figure A.2 – Topology example . 14

Table 1 – CP 16/1: PhL selection . 9
Table 2 – CP 16/1: DLL protocol selection . 10
Table 3 – CP 16/1: AL service selection . 10
Table 4 – CP 16/2: PhL selection . 11
Table A.1 – Number of devices per CP16/1 and CP16/2 systems (examples). 14

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL NETWORKS –
PROFILES –
Part 1-16: Fieldbus profiles –
Communication Profile Family 16

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 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.
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 61784-1-16 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.

– 4 – IEC 61784-1-16:2023 © IEC 2023
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.
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
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).

___________
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.

– 6 – IEC 61784-1-16:2023 © IEC 2023
INDUSTRIAL NETWORKS –
PROFILES –
Part 1-16: Fieldbus profiles –
Communication Profile Family 16

1 Scope
This part of IEC 61784-1 defines Communication Profile Family 16 (CPF 16). CPF 16 specifies
a set of protocol specific communication profiles (CPs) based on the IEC 61158 series (Type 16
and Type 19) 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 16 are specified in IEC 61784-2-16.
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 61158-3-16:2007, Industrial communication networks – Fieldbus specifications – Part 3-16:
Data-link layer service definition – Type 16 elements
IEC 61158-3-19:2019, Industrial communication networks – Fieldbus specifications – Part 3-19:
Data-link layer service definition – Type 19 elements
IEC 61158-4-16:2007, Industrial communication networks – Fieldbus specifications – Part 4-16:
Data-link layer protocol specification – Type 16 elements
IEC 61158-4-19:2019, Industrial communication networks – Fieldbus specifications – Part 4-19:
Data-link layer protocol specification – Type 19 elements
IEC 61158-5-16:2007, Industrial communication networks – Fieldbus specifications – Part 5-16:
Application layer service definition – Type 16 elements

IEC 61158-5-19:2019, Industrial communication networks – Fieldbus specifications – Part 5-19:
Application layer service definition – Type 19 elements
IEC 61158-6-16:2007, Industrial communication networks – Fieldbus specifications – Part 6-16:
Application layer protocol specification – Type 16 elements
IEC 61158-6-19:2019, Industrial communication networks – Fieldbus specifications – Part 6-19:
Application layer protocol specification – Type 19 elements
IEC 61784-1-0:2023, Industrial networks – Profiles – Part 1-0: Fieldbus profiles – General
concepts and terminology
IEC 61784-2-16:2023, Industrial networks – Profiles – Part 2-16: Additional real-time fieldbus
profiles based on ISO/IEC/IEEE 8802-3 – CPF 16
ISO/IEC/IEEE 8802-3, Telecommunications and exchange between information technology
systems – Requirements for local and metropolitan area networks – Part 3: Standard for
Ethernet
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
None.
3.3 Conventions
For the purposes of this document, the conventions defined in IEC 61784-1-0 apply.

– 8 – IEC 61784-1-16:2023 © IEC 2023
4 CPF 16 (SERCOS )
4.1 General overview
Communication Profile Family 16 defines communication profiles based on IEC 61158-2
type 16, IEC 61158-3-16, IEC 61158-4-16, IEC 61158-5-16 and IEC 61158-6-16, and on
IEC 61158-3-19, IEC 61158-4-19, IEC 61158-5-19 and IEC 61158-6-19, which collectively
correspond to parts of a communication system commonly known as SERCOS interface.
– Profile 16/1 (SERCOS I)
This profile is based on fiber-media physical layers and operates at 2 Mbit/s and 4 Mbit/s
(see 4.2).
– Profile 16/2 (SERCOS II)
This profile is similar to 16/1, but operates also at 8 Mbit/s and 16 Mbit/s, and provides for
additional features (see 4.3).
– Profile 16/3 (SERCOS III)
This profile is based on ISO/IEC/IEEE 8802-3 (Ethernet) MAC and physical layers; it
provides again for additional features (see IEC 61784-2-16, 4.2).
NOTE See Annex A for an overview of SERCOS communications concepts.
4.2 CP 16/1 (SERCOS I)
4.2.1 Physical layer selection
Table 1 specifies the PhL selection within IEC 61158-2 for this profile.
___________
SERCOS is a trade name of Sercos International e.V. 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 trade name requires
permission of the trade name holder.

Table 1 – CP 16/1: PhL selection
Clause Header Presence Constraints
0 Introduction YES 
1 Scope YES

2 Normative references Partial Used as needed
3 Terms and definitions
 
3.1 Common terms and definitions Partial Used when applicable
3.2 – 3.8 NO
 
3.9 Type 16: Terms and definitions YES

Next  NO 
subclauses
4 Symbols and abbreviated terms  
4.1 Symbols  
4.1.1 – 4.1.7 NO
 
4.1.8 Type 16: Symbols YES 
Next  NO 
subclauses
4.2 Abbreviated terms  
4.2.1 – 4.2.7 NO
 
4.2.8 Type 16: Abbreviations YES

Next  NO 
subclauses
5 Data-link layer – physical layer interface  
5.1 General Partial Used as needed
5.2 – 5.8  NO 
5. 9 Type 16: Required services YES 
Next NO
 
subclauses
6 – 8 NO
 
9 Medium dependent sublayer (MDS)
 
9.1 General Partial Used as needed
9.1 – 9.9 NO
 
9.10 Type 16: MDS: Optical media YES 
Next  NO 
subclauses
10 – 29  NO 
30 Medium attachment unit: optical fiber medium at YES Used up to the exception
2 Mbit/s, 4 Mbit/s, 8 Mbit/s and 16 Mbit/s below
30.2.3 Data rate Partial CP16/2 not used
Next clauses  NO 
Annex A – M NO
 
Annex N Type 16: Connector specification YES

Annex O Type 16: Optical network topology YES 
Annex P Type 16: Reference design example YES 
Next annexes NO
 
– 10 – IEC 61784-1-16:2023 © IEC 2023
4.2.2 Data-link layer
4.2.2.1 DLL service selection
DLL services are defined in IEC 61158-3-16. IEC 61158-3-16 applies except 4.3.
4.2.2.2 DLL protocol selection
Table 2 specifies the DLL protocol selection within IEC 61158-4-16 for this profile.
Table 2 – CP 16/1: DLL protocol selection
Clause Header Presence Constraints
Whole Data-link protocol specification (Type 16) YES Used up to the exceptions
document below
5.3 MDT DLPDU
 
5.3.1 – 5.3.4  YES 
5.3.5 CP5 NO Not used for CP16/1
5.3.6 CP6 NO Not used for CP16/1
5.4 AT DLPDU
 
5.4.1 – 5.4.4  YES 
5.4.5 CP5 NO Not used for CP16/1
5.4.6 CP6 NO Not used for CP16/1

4.2.3 Application layer
4.2.3.1 AL service selection
Table 3 specifies the AL service selection within IEC 61158-5-16 for this profile.
Table 3 – CP 16/1: AL service selection
Clause Header Presence Constraints
Whole document Application service specification (Type 16) YES Used up to the exceptions below
6.2.3.3.10 File download service NO Not used for CP16/1
6.2.3.3.11 File upload service NO Not used for CP16/1

4.2.3.2 AL protocol selection
AL protocols are specified in IEC 61158-5-16. IEC 61158-5-16 applies except 4.5.3.3.10.
4.3 CP 16/2 (SERCOS II)
4.3.1 Physical layer
Table 4 specifies the PhL selection within IEC 61158-2 for this profile.

Table 4 – CP 16/2: PhL selection
Clause Header Presence Constraints
0 Introduction YES 
1 Scope YES

2 Normative references Partial Used as needed
3 Terms and definitions
 
3.1 Common terms and definitions Partial Used when applicable
3.2 – 3.8 NO
 
3.9 Type 16: Terms and definitions YES

Next  NO 
subclauses
4 Symbols and abbreviated terms  
4.1 Symbols  
4.1.1 – 4.1.7 NO
 
4.1.8 Type 16: Symbols YES 
Next  NO 
subclauses
4.2 Abbreviated terms  
4.2.1 – 4.2.7 NO
 
4.2.8 Type 16: Abbreviations YES

Next  NO 
subclauses
5 Data-link layer – Physical layer interface  
5.1 General Partial Used as needed
5.2 – 5.8  NO 
5. 9 Type 16: Required services YES 
Next NO
 
subclauses
6 – 8 NO
 
9 Medium dependent sublayer (MDS)
 
9.1 General Partial Used as needed
9.1 – 9.9 NO
 
9.10 Type 16: MDS: Optical media YES 
Next  NO 
subclauses
10 – 29  NO
30 Medium attachment unit: optical fiber medium at 2, 4, 8 YES

and 16 Mbit/s
Next clauses NO
 
Annex A – NO
 
Annex M
Annex N Type 16: Connector specification YES

Annex O Type 16: Optical network topology YES 
Annex P Type 16: Reference design examples YES 
Next annexes NO
 
– 12 – IEC 61784-1-16:2023 © IEC 2023
4.3.2 Data-link layer
4.3.2.1 DLL service selection
DLL services are specified in IEC 61158-3-16.
4.3.2.2 DLL protocol selection
DLL protocols are specified in IEC 61158-4-16.
4.3.3 Application layer
4.3.3.1 AL service selection
AL services are specified in IEC 61158-5-16.
4.3.3.2 AL protocol selection
AL protocols are specified in IEC 61158-6-16.

Annex A
(informative)
CPF 16 (SERCOS) communication concepts
CPF 16 (SERCOS) provides for communication between a master and several slave devices.
Mater telegrams are not addressed individually to each device; they are instead common to all
devices. Slots within these telegrams are individually allotted to each device. The device may
then read in its slot the data that is addressed specifically to it by the master; likewise it may
also write data that it addresses to the master. The slot allocation is defined by the master
during initialization, depending upon configuration. Other transmission modes are available for
data that do not have to fulfill strict real-time requirements.
SERCOS allows for synchronization during cyclic data transmission. Depending on the
configuration, the operating cycle of the master may be synchronized with the communication
cycle and with the operating cycle of the devices. In that way, beats between individual cycles
can be prevented and latency delays can be reduced to a minimum. Device output signals may
become active and device input signals may be sampled concurrently in all devices.
SERCOS is not just a data transmission system. It provides a large number of data and
procedure commands which can be used, i.e. for the operation of machines. All data, procedure
commands, and all supplementary information are summarized in data blocks, which contain
each an identification number (IDN), a name, attributes, units, minimum and maximum input
values as well as the data itself. Several of them are specified in application-specific standards
(e.g., IEC 61800-7-204 for power drive systems).
CP16/1 and CP16/2 physical layers are based on fiber optic hardware. The topology shall be a
ring structure (see Figure A.1).

Figure A.1 – Ring structure
A master device may have one or more master interfaces depending on configuration. Each
master interface handles only one network on the physical layer as well as in the overlying
protocol layers.
NOTE Figure A.2 shows a topology example in the field of power drive systems as specified in IEC 61800-7-204.
The application specific terms used in this figure are not defined in this document.

– 14 – IEC 61784-1-16:2023 © IEC 2023

Figure A.2 – Topology example
CP16/1 and CP16/2 communication cycle times may be selected between 62,5 µs, 125 µs,
250 µs or any integer multiple of 250 µs. The exact number of devices which can be serviced
by a network depends on the cycle time, the selected data volume, and the transmission rate.
The following details (see Table A.1) are valid under normal operating conditions.
Table A.1 – Number of devices per CP16/1 and CP16/2 systems (examples)
Cycle time Data record per Transmission Number of Data rate per device Spare
device rate devices (non-cyclic data) time
(cyclic data)
2 ms 32 bytes 2 Mbit/s 8 8 kbit/s (2 bytes) 390 µs
1 ms 32 bytes 4 Mbit/s 8 16 kbit/s (2 bytes) 125 µs
1 ms 36 bytes 8 Mbit/s 15 32 kbit/s (4 bytes) 208 µs
0,5 ms 36 bytes 16 Mbit/s 14 128 kbit/s (8 bytes) 113 µs
2 ms 16 bytes 16 Mbit/s 112 8 kbit/s (2 bytes) 330 µs

Bibliography
IEC 60793 (all parts), Optical fibres
IEC 60807-3, Rectangular connectors for frequencies below 3 MHz – Part 3: Detail specification
for a range of connectors with trapezoidal shaped metal shells and round contacts – Removable
crimp contact types with closed crimp barrels, rear insertion/rear extraction
IEC 61158-1, Industrial communication networks – Fieldbus specifications – Part 1: Overview
and guidance for the IEC 61158 and IEC 61784 series
IEC 61158-3 (all parts), Industrial communication networks – Fieldbus specifications – Part 3:
Data-link layer service definition
IEC 61158-4 (all parts), Industrial communication networks – Fieldbus specifications – Part 4:
Data-link layer protocol specification
IEC 61158-5 (all parts), Industrial communication networks – Fieldbus specifications – Part 5:
Application layer service definition
IEC 61158-6 (all parts), Industrial communication networks – Fieldbus specifications – Part 6:
Application layer protocol specification
IEC 61784-1 (all parts), Industrial networks – Profiles – Part 1: Fieldbus profiles
IEC 61784-2 (all parts), Industrial networks – Profiles – Part 2: Additional real-time fieldbus
profiles based on ISO/IEC/IEEE 8802-3
IEC 61800-7-204, Adjustable speed electrical power drive systems – Part 7-204: Generic
interface and use of profiles for power drive systems – Profile type 4 specification
ISO/IEC 2022, Information technology – Character code structure and extension techniques
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Basic Reference
Model: The Basic Model
ISO/IEC 7498-3, Information technology – Open Systems Interconnection – Basic Reference
Model: Naming and addressing
ISO/IEC TR 10000-1, Information technology – Framework and taxonomy of International
Standardized Profiles – Part 1: General principles and documentation framework
ISO/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services

___________
– 16 – IEC 61784-1-16:2023 © IEC 2023
SOMMAIRE
AVANT-PROPOS . 17
INTRODUCTION . 19
1 Domaine d’application . 20
2 Références normatives . 20
3 Termes, définitions, abréviations, symboles et conventions . 21
3.1 Termes et définitions . 21
3.2 Abréviations et symboles . 21
3.2.1 Abréviations et symboles communs . 21
3.2.2 Autres abréviations et symboles . 21
3.3 Conventions . 22
4 CPF 16 (SERCOS) . 22
4.1 Présentation générale . 22
4.2 CP 16/1 (SERCOS I) . 22
4.2.1 Sélection de la couche physique . 22
4.2.2 Couche liaison de données . 24
4.2.3 Couche application . 24
4.3 CP 16/2 (SERCOS II) . 24
4.3.1 Couche physique . 24
4.3.2 Couche liaison de données . 26
4.3.3 Couche application . 26
Annexe A Concepts de communication CPF 16 (SERCOS) . 27
Bibliographie . 29

Figure A.1 – Structure annulaire . 27
Figure A.2 – Exemple de topologie . 28

Tableau 1 – CP 16/1: sélection de la PhL . 23
Tableau 2 – CP 16/1: sélection du protocole DLL . 24
Tableau 3 – CP 16/1: Sélection des services AL . 24
Tableau 4 – CP 16/2: sélection de la PhL . 25
Tableau A.1 – Nombre d’appareils par systèmes CP16/1 et CP16/2 (exemples) . 28

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
RÉSEAUX INDUSTRIELS –
PROFILS –
Partie 1-16: Profils de bus de terrain –
Famille de profils de communication 16

AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation
composée de l’ensemble des comités électrotechniques nationaux (Comités nationaux de l’IEC). L’IEC a pour
objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines
de l’électricité et de l’électronique. A cet effet, l’IEC – entre autres activités – publie des Normes
internationales, des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au
public (PAS) et des Guides (ci-après dénommés "Publication(s) de l’IEC"). Leur élaboration est confiée à des
comités d’études, aux travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les
organisations internationales, gouvernementales et non gouvernementales, en liaison avec l’IEC, participent
également aux travaux. L’IEC collabore étroitement avec l’Organisation Internationale de Normalisation (ISO),
selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de l’IEC concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de l’IEC
intéressés sont représentés dans chaque comité d’études.
3) Les Publications de l’IEC se présentent sous la forme de recommandations internationales et sont agréées
comme telles par les Comités nationaux de l’IEC. Tous les efforts raisonnables sont entrepris afin que l’IEC
s’assure de l’exactitude du contenu technique de ses Publications; l’IEC ne peut pas être tenue responsable de
l’éventuelle mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d’encourager l’uniformité internationale, les Comités nationaux de l’IEC s’engagent, dans toute la
mesure possible, à appliquer de façon transparente les Publications de l’IEC dans leurs publications nationales
et régionales. Toutes divergences entre toutes Publications de l’IEC et toutes publications nationales ou
régionales correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) L’IEC elle-même ne fournit aucune attestation de conformité. Des organismes de certification indépendants
fournissent des services d’évaluation de conformité et, dans certains secteurs, accèdent aux marques de
conformité de l’IEC. L’IEC n’est responsable d’aucun des services effectués par les organismes de certification
indépendants.
6) Tous les utilisateurs doivent s’assurer qu’ils sont en possession de la dernière édition de cette publication.
7) Aucune responsabilité ne doit être imputée à l’IEC, à ses administrateurs, employés, auxiliaires ou
mandataires, y compris ses experts particuliers et les membres de ses comités d’études et des Comités
nationaux de l’IEC, pour tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre
dommage de quelque nature que ce soit, directe ou indirecte, ou pour supporter les coûts (y compris les frais
de justice) et les dépenses découlant de la publication ou de l’utilisation de cette Publication de l’IEC ou de
toute autre Publication de l’IEC, ou au crédit qui lui est accordé.
8) L’attention est attirée sur les références normatives citées dans cette publication. L’utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L’attention est attirée sur le fait que certains des éléments de la présente Publication de l’IEC peuvent faire
l’objet de droits de brevet. L’IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits
de propriété et averti de leur existence.
L’attention est attirée sur le fait que l’utilisation de certains des types de protocoles associés
est restreinte par les détenteurs des droits de propriété intellectuelle. En tout état de cause,
l’engagement de renonciation partielle aux droits de propriété intellectuelle pris par les
détenteurs de ces droits autorise l’utilisation d’un type de protocole de couche avec les autres
protocoles de couche du même type, ou dans des combinaisons avec d’autres types
autorisées explicitement par les détenteurs respectifs des droits de propriété intellectuelle
pour ces types.
NOTE Les combinaisons de types de protocoles sont spécifiées dans la série IEC 61784-1 et dans la série
IEC 61784-2.
– 18 – IEC 61784-1-16:2023 © IEC 2023
L’IEC 61784-1-16 a été établie par le sous-comité 65C: Réseaux industriels, du comité
d’études 65 de l’IEC: Mesure, commande et automation dans les processus industriels Il
s’agit d’une Norme internationale.
Cette première édition, conjointement avec les autres parties de la même série, annule et
remplace la cinquième édition de l’IEC 61784-1 parue en 2019. Cette première édition
constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à
l’IEC 61784-1:2019:
a) scission de l’IEC 61784-1 d’origine en plusieurs sous-parties, une sous-partie pour le
matériel de nature générique et une sous-partie pour chaque famille de profils de
communication spécifiée dans le document d’origine.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
65C/1207/FDIS 65C/1236/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La version française de cette norme n'a pas été soumise au vote.
La langue employée pour l’élaboration de cette Norme internationale est l’anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l’IEC sont décrits plus en détail sous www.iec.ch/publications.
Une liste de toutes les parties de la série IEC 61784-1, publiées sous le titre général Réseaux
industriels – Profils – Partie 1: Profils de bus de terrain, se trouve sur le site web de l’IEC.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de
stabilité indiquée sur le site web de l’IEC sous webstore.iec.ch dans les données relatives au
document recherché. A cette date, le document sera
• reconduit,
• supprimé,
• remplacé par une édition révisée, ou
• amendé.
...