IEC 61784-1-1:2023

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

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

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and withdrawn publications.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 61784-1-1 ®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial networks – Profiles –

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

Réseaux industriels – Profils –

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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 35.100.20; 35.240.50 ISBN 978-2-8322-6591-8

– 2 – IEC 61784-1-1:2023 © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, abbreviated terms, symbols, and conventions . 10
3.1 Terms and definitions . 10
3.2 Abbreviations and symbols . 10
3.2.1 Common abbreviations and symbols . 10
3.2.2 Other abbreviations and symbols . 11
3.3 Conventions . 11
4 CPF 1 (FOUNDATION™ Fieldbus) . 11
4.1 General overview . 11
4.2 CP 1/1 (FOUNDATION™ H1) . 12
4.2.1 Physical layer . 12
4.2.2 Data-link layer . 27
4.2.3 Application layer . 97
4.3 CP 1/2 (FOUNDATION™ HSE) . 99
4.3.1 Physical layer . 99
4.3.2 Data-link layer . 99
4.3.3 Network layer . 99
4.3.4 Transport layer . 99
4.3.5 Application layer . 99
4.4 CP 1/3 (FOUNDATION™ H2) . 100
4.4.1 Physical layer . 100
4.4.2 Data-link layer . 102
4.4.3 Application layer . 102
Annex A (informative) CPF 1 (FOUNDATION Fieldbus) communication concepts . 103
A.1 Overview. 103
A.2 Physical layer characteristics . 103
A.2.1 H1 physical layer . 103
A.2.2 HSE physical layer . 103
A.3 Data-link layer characteristics . 103
A.3.1 H1 data-link layer . 103
A.3.2 HSE data-link, network and transport layers . 104
A.4 Application layer characteristics . 104
A.5 Management characteristics . 104
Bibliography . 105

Figure 1 – Example optical power budget for a 100/140 μm fiber system with a 16/16 o
ptical passive star coupler . 27

Table 1 – CPF 1: overview of profile sets . 11
Table 2 – CP 1/1: PhL selection for communicating devices and their MAUs . 12
Table 3 – CP 1/1: PhL classification of MAUs and attached devices . 14
Table 4 – CP 1/1: PhL selection of Clause 16 for devices and their MAUs . 14

Table 5 – CP 1/1: PhL selection of Clause 12 for devices and their MAUs . 15
Table 6 – CP 1/1: PhL selection of recommended IS parameters for MAU classes 111,
112, 121, 122, 511 and 512 . 16
Table 7 – CP 1/1: PhL selection for media components . 17
Table 8 – CP 1/1: PhL selection of imperative IS parameters for media in FISCO

systems . 18
Table 9 – CP 1/1: PhL selection for power supplies . 19
Table 10 – CP 1/1: PhL selection of power supply types . 20
Table 11 – CP 1/1: PhL selection of permissible output voltage and IS parameters for
FISCO power supplies . 20
Table 12 – CP 1/1: PhL selection for terminators . 21
Table 13 – CP 1/1: PhL selection of IS parameters for terminators . 22
Table 14 – CP 1/1: PhL selection of Clause 12 for intrinsic safety barriers . 22
Table 15 – CP 1/1: PhL selection of recommended IS parameters for intrinsic safety
barriers and galvanic isolators (Entity model only) . 23
Table 16 – CP 1/1: PhL selection of Clause 12 for intrinsically safe galvanic isolators . 24
Table 17 – CP 1/1: PhL selection of Clause 15, recommended optical fiber types . 25
Table 18 – CP 1/1: PhL selection of passive star couplers, recommended maximum
insertion loss . 25
Table 19 – CP 1/1: PhL selection of active star couplers . 26
Table 20 – CP 1/1: Optical power budget considerations . 26
Table 21 – CP 1/1: DLL service selection . 27
Table 22 – CP 1/1: DLL service selection of Clause 5 . 28
Table 23 – CP 1/1: DLL service selection of 5.4 . 28
Table 24 – CP 1/1: DLL service selection of 5.4.1 . 28
Table 25 – CP 1/1: DLL service selection of 5.4.3 . 29
Table 26 – CP 1/1: DLL service selection of 5.4.6 . 29
Table 27 – CP 1/1: DLL service selection of Clause 6 . 30
Table 28 – CP 1/1: DLL service selection of the summary of 6.3, DL-connection QoS . 31
Table 29 – CP 1/1: DLL service selection of Figures 9 to 14 of 6.4. 31
Table 30 – CP 1/1: DLL service selection of 6.5 . 32
Table 31 – CP 1/1: DLL service selection: replacement for Table 13 of 6.5 . 33
Table 32 – CP 1/1: DLL service selection of 6.5, replacement for Table 14 . 34
Table 33 – CP 1/1: DLL service selection of 6.5 for use of addresses for peer DLC . 34
Table 34 – CP 1/1: DLL service selection of 6.5 for use of addresses for multipeer DLC
connect request at publisher . 34
Table 35 – CP 1/1: DLL service selection of 6.5 for use of addresses for multipeer DLC
connect request at subscriber . 34
Table 36 – CP 1/1: DLL service selection of 6.6 . 35
Table 37 – CP 1/1: DLL service selection: replacement for Table 15 of 6.6 . 35
Table 38 – CP 1/1: DLL service selection of 6.7 . 36
Table 39 – CP 1/1: DLL service selection of 6.7, replacement for Table 16 . 36
Table 40 – CP 1/1: DLL service selection of 6.7, replacement for Table 17 . 36
Table 41 – CP 1/1: DLL service selection of 6.7, replacement for Table 18 . 37
Table 42 – CP 1/1: DLL service selection of Clause 7 . 37

– 4 – IEC 61784-1-1:2023 © IEC 2023
Table 43 – CP 1/1: DLL service selection of 7.5, replacement for Table 23 . 38
Table 44 – CP 1/1: DLL service selection of Clause 8 . 39
Table 45 – CP 1/1: DLL service selection of 8.5, replacement for Table 28 . 39
Table 46 – CP 1/1: DLL protocol selection . 40
Table 47 – CP 1/1: DLL protocol selection of Clause 4 . 40
Table 48 – CP 1/1: DLL protocol selection of 4.3 . 41
Table 49 – CP 1/1: DLL protocol selection of 4.3.2.1 for use of link designators . 41
Table 50 – CP 1/1: DLL protocol selection of 4.3.2.2 for use of node designators . 41
Table 51 – CP 1/1: DLL protocol selection of 4.3.3.1 for predefined flat non–local
DL-addresses . 42
Table 52 – CP 1/1: DLL protocol selection of 4.3.3.2 for predefined flat link–local

DL-addresses . 42
Table 53 – CP 1/1: DLL protocol selection of 4.3.3.3 for predefined node–local
DL-addresses . 42
Table 54 – CP 1/1: DLL protocol selection of 4.7 . 43
Table 55 – CP 1/1: DLL protocol selection of 4.7.4. 44
Table 56 – CP 1/1: DLL protocol selection of 4.7.5. 45
Table 57 – CP 1/1: DLL protocol selection of Clause 6 . 46
Table 58 – CP 1/1: DLL protocol selection, replacement for Table 10 of 6.0 . 47
Table 59 – CP 1/1: DLL protocol selection of 6.5 . 48
Table 60 – CP 1/1: DLL protocol selection of 6.7 . 51
Table 61 – CP 1/1: DLL protocol selection of 6.8 . 55
Table 62 – CP 1/1: DLL protocol selection of 6.11. 56
Table 63 – CP 1/1: DLL protocol selection of 6.12. 56
Table 64 – CP 1/1: DLL protocol selection of 6.15. 57
Table 65 – CP 1/1: DLL protocol selection of 6.20. 58
Table 66 – CP 1/1: DLL protocol selection of Clause 7 . 59
Table 67 – CP 1/1: DLL protocol selection of 7.4 . 60
Table 68 – CP 1/1: DLL protocol selection of Clause 8 . 61
Table 69 – CP 1/1: DLL protocol selection of 8.2 . 62
Table 70 – CP 1/1: DLL protocol selection of 8.2.2. 72
Table 71 – CP 1/1: DLL protocol selection of 8.3 . 85
Table 72 – CP 1/1: DLL protocol selection of 8.4 . 85
Table 73 – CP 1/1: DLL protocol selection of Clause 9 . 87
Table 74 – CP 1/1: DLL protocol selection of 9.3 . 87
Table 75 – CP 1/1: DLL protocol selection of 9.3.5. 89
Table 76 – CP 1/1: DLL protocol selection of 9.3.5.2.2, replacement for element
encoding . 90
Table 77 – CP 1/1: DLL protocol selection of Clause 10 . 91
Table 78 – CP 1/1: DLL protocol selection of 10.2. 91
Table 79 – CP 1/1: DLL protocol selection of 10.3. 92
Table 80 – CP 1/1: DLL protocol selection of 10.3.7, specification of errors . 94
Table 81 – CP 1/1: DLL protocol selection of 10.4. 95
Table 82 – CP 1/1: DLL protocol selection of 10.5. 96

Table 83 – CP 1/1: DLL protocol selection of 10.6. 97
Table 84 – CP 1/1: AL service selection . 97
Table 85 – CP 1/1: AL data type selection of Clause 4 . 98
Table 86 – CP 1/1: AL protocol selection . 98
Table 87 – CP 1/2: AL service selection . 99
Table 88 – CP 1/2: AL protocol selection . 100
Table 89 – CP 1/3: PhL selection for H2 devices . 100
Table 90 – CP 1/3: PhL selection for H2 media and related components . 102

– 6 – IEC 61784-1-1:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL NETWORKS –
PROFILES –
Part 1-1: Fieldbus profiles –
Communication Profile Family 1

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 61784-1-1 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.

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.
– 8 – IEC 61784-1-1:2023 © 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
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.

INDUSTRIAL NETWORKS –
PROFILES –
Part 1-1: Fieldbus profiles –
Communication Profile Family 1

1 Scope
This part of IEC 61784-1 defines Communication Profile Family 1 (CPF 1). CPF 1 specifies a
set of protocol specific communication profiles (CPs) based on the IEC 61158 series (Type 1,
Type 5 and Type 9) and other standards, to be used in the design of devices involved in
communications in factory manufacturing and process control.
NOTE 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.
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 60079-11, Explosive atmospheres – Part 11: Equipment protection by intrinsic safety "i"
IEC 60079-25, Explosive atmospheres – Part 25: Intrinsically safe electrical systems
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 61158-3-1:2014, Industrial communication networks – Fieldbus specifications – Part 3-1:
Data-link layer service definition – Type 1 elements
IEC 61158-4-1:2014, Industrial communication networks – Fieldbus specifications – Part 4-1:
Data-link layer protocol specification – Type 1 elements
IEC 61158-5-5:2014, Industrial communication networks – Fieldbus specifications – Part 5-5:
Application layer service definition – Type 5 elements
IEC 61158-5-9:2014, Industrial communication networks – Fieldbus specifications – Part 5-9:
Application layer service definition – Type 9 elements

– 10 – IEC 61784-1-1:2023 © IEC 2023
IEC 61158-6-5:2014, Industrial communication networks – Fieldbus specifications – Part 6-5:
Application layer protocol specification – Type 5 elements
IEC 61158-6-9:2014, Industrial communication networks – Fieldbus specifications – Part 6-9:
Application layer protocol specification – Type 9 elements
IEC 61784-1-0:2023, Industrial networks – Profiles – Part 1-0: Fieldbus profiles – General
concepts and terminology
ISO/IEC 8802-2:1998, Information technology – Telecommunications and information exchange
between systems – Local and metropolitan area networks – Specific requirements – Part 2:
Logical link control
ISO/IEC/IEEE 8802-3, Telecommunications and exchange between information technology
systems – Requirements for local and metropolitan area networks – Part 3: Standard for
Ethernet
ISO/IEC 15802-3 , Information technology – Telecommunications and information exchange
between systems – Local and metropolitan area networks – Common specifications – Part 3:
Media Access Control (MAC) Bridges
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 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, 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
___________
This standard has been withdrawn.

3.2.2 Other abbreviations and symbols
IP internet protocol (see IETF RFC 791)
IS intrinsically safe (as an adjective)
intrinsic safety (as a noun)
TCP terminal control protocol (see IETF RFC 793)
UDP user datagram protocol (see IETF RFC 768)
3.3 Conventions
For the purposes of this document, the conventions defined in IEC 61784-1-0 apply.
4 CPF 1 (FOUNDATION™ Fieldbus )
4.1 General overview
Communication Profile Family 1 defines profiles based on IEC 61158-2, IEC 61158-3-1,
IEC 61158-4-1 physical and data-link protocol Type 1, IEC 61158-5-9 and IEC 61158-6-9
application protocol Type 9, and IEC 61158-5-5 and IEC 61158-6-5 application protocol Type 5,
and on other standards (see Table 1).
The FOUNDATION Fieldbus family of protocols consists primarily of two distinct protocol sets,
known generically (for historical reasons) as H1 and HSE. The H1 profiles are a subset of
IEC 61158 Type 1 physical and data-link and Type 9 application services and protocols, and
include both wire-media and fiber-media physical layers operating at 31,25 kbit/s. The HSE
profiles are based on use of the ISO/IEC/IEEE 8802-3 (Ethernet-like) MAC and physical layers,
and on use of standard internet network and transport layer protocols; they use the Type 5
application services and protocols.
A third profile set has been developed within the FieldComm Group, but is not in current or
planned use. It is included in this profile because it provides a migration path to CPF 1 from
some of the CPF 5 protocols, and exclusion from this document could inhibit that migration.
Table 1 – CPF 1: overview of profile sets
Layer Profile 1/1 (H1) Profile 1/2 (HSE) Profile 1/3 (H2)
Application IEC 61158-5-9, IEC 61158-6-9 IEC 61158-5-5, IEC 61158-5-9,
IEC 61158-6-5 IEC 61158-6-9
Transport — IETF RFC 768, —
IETF RFC 793
Network — IETF RFC 791 —
Data-link IEC 61158-3-1, IEC 61158-4-1 ISO/IEC/IEEE 8802-3, IEC 61158-3-1,
ISO/IEC 8802-2 IEC 61158-4-1
Physical IEC 61158-2, 31,25 kbit/s, primarily Type 1 any of ISO/IEC/IEEE Type 1 of IEC 61158-2
8802-3
NOTE 1 See Annex A for an overview of FOUNDATION Fieldbus communications concepts.
NOTE 2 Profile CP 1/2 (HSE) supports communications through both local- and wide-area network infrastructures.
It is readily obtainable as commercial off-the-shelf (COTS) technology.
___________
FOUNDATION™ Fieldbus is a trade name of the FieldComm Group. 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 trade name FOUNDATION™ Fieldbus. Use of the
trade name FOUNDATION™ Fieldbus requires permission of the trade name holder.

– 12 – IEC 61784-1-1:2023 © IEC 2023
NOTE 3 Profile CP 1/3 (H2) is similar to CP 1/1 (H1), but with a different and more varied selection of physical layer
data rates. It provides a migration path for existing CPF 5/1 installations, such that passive media components are
unaffected by the migration.
4.2 CP 1/1 (FOUNDATION™ H1)
4.2.1 Physical layer
4.2.1.1 Communicating devices
4.2.1.1.1 Introduction
Table 2 specifies the IEC 61158-2 PhL selection for a communicating device and its MAU(s).
Table 2 – CP 1/1: PhL selection for communicating devices and their MAUs
Clause Header Presence Constraints
1 Scope YES —
2 Normative references Partial Used if needed
3 Terms and definitions — —
3.1 Common terms and definitions Partial Used when applicable
3.2 Type 1: Terms and definitions YES —
Next — NO —
subclauses
4 Symbols and abbreviated terms — —
4.1 Symbols — —
4.1.1 Type 1: Symbols YES —
4.1.2 – 4.1.11 — NO —
4.2 Abbreviated terms — —
4.2.1 Type 1: Abbreviations YES —
Next
— NO —
subclauses
5 Data-link layer – Physical Layer interface — —
5.1 General Partial Used when applicable
5.2 Type 1: Required services YES —
Next
— NO —
subclauses
6 Systems Management – Physical Layer interface — —
6.1 General Partial Used when applicable
6.2 Type 1: Systems Management – Physical Layer interface YES —
Next
— NO —
subclauses
7 DCE Independent Sublayer (DIS) — —
7.1 General Partial Used when applicable
7.2 Type 1: DIS YES —
Next — NO —
subclauses
8 DTE – DCE interface — —
8.1 General Partial Used when applicable
8.2 Type 1: DTE – DCE interface YES —
Next — NO —
subclauses
Clause Header Presence Constraints
9 Medium Dependent Sublayer (MDS) — —
9.1 General Partial Used when applicable
9.2 Type 1: MDS: Wire and optical media YES —
Next — NO —
subclauses
10 MDS – MAU interface — —
10.1 General Partial Used when applicable
10.2 Type 1: MDS – MAU interface: wire and optical media YES —
Next — NO —
subclauses
11 Type 1 and 7: Medium Attachment Unit: voltage mode, NO
linear-bus-topology 150 Ω twisted-pair wire medium
12 Type 1 and 3: Medium Attachment Unit: 31,25 kbit/s, voltage- YES See 4.2.1.1.2
mode with low-power option, bus- and tree-topology, 100 Ω
wire medium
13 – 15 — NO —
16 Type 1: Medium Attachment Unit: 31,25 kbit/s, single-fiber YES See 4.2.1.1.2
optical medium
17 – 20 — NO —
21 Type 3: Medium Attachment Unit: Synchronous transmission, YES See 4.2.1.1.2
31,25 kbit/s, voltage mode, wire medium (denigrated)
Next clauses — NO —
Annex A Type 1: Connector specification — —
a
A.1 Internal Connector for wire medium YES
a
A.2 External Connectors for wire medium YES
b
A.3 External Connectors for optical medium Partial
Annex B Type 1: Cable specifications and trunk and spur lengths for YES —
the 31,25 kbit/s voltage-mode MAU
b
Annex C Types 1 and 7: Optical passive stars Partial
b
Annex D Types 1 and 7: Star topology Partial
b
Annex E Type 1: Alternate fibers Partial
Next annexes — NO —
a
Connector is optional for use with shielded or twisted-pair 100 Ω wire media.
b
Single fiber specifications are optional for use with single fiber media.

4.2.1.1.2 MAU and device classes
Each MAU is classified according to its characteristics when interfacing to its associated
medium, as specified in Table 3. For devices with a single attached MAU, whether separate or
integral, the MAU class is also considered to be the device class. The selection of the proper
clause of IEC 61158-2, Clause 12 or Clause 16, is based on the MAU class for which the MAU,
and sometimes the associated device, are designed. The selection of Clause 21 is denigrated
– not recommended for new designs – because the alternative clause, Clause 12, permits
devices to lower their power consumption during periods of non-transmission.
This profile also lists recommendations, which are not mandatory for implementation and/or not
specified in IEC 61158-2, but are included to achieve interoperability amongst devices
conforming to this profile. Specifically, 4.2.1.1.3.3 applies to each MAU, as so does 4.2.1.1.3.4
for MAUs meeting IS rules.
– 14 – IEC 61784-1-1:2023 © IEC 2023
Table 3 – CP 1/1: PhL classification of MAUs and attached devices
Attribute Attribute value CP 1/1 MAU class
111 112 113 114 115 116  511 512 411
Connected 100 Ω shielded or twisted wire X X X X X X  X X
medium pair
Single bidirectional multimode
X
fiber
Device powered Completely (see NOTE 2, X X X  X
from medium NOTE 3)
Partially; not completely (see X X X  X
NOTE 2, NOTE 4)
Not at all      X
Intrinsic Safety Not specified by this profile      X
construction rules
None  X X
Entity model (see IEC 60079-11) X X
Energy Limited (Ex nL) or   X X  X X
Nonincendive Field Wiring (NIFW)
FISCO model (see IEC 60079-11
and IEC 60079-25)
Relevant MAU Clause 16 (see Table 4)      X
and device clause
Clause 12 (see Table 5) X X X X X X  X X
of IEC 61158-2
Clause 21 (denigrated)
NOTE 1 Low power signaling, optionally specified in Clause 12, is not included in any of these MAU types.
NOTE 2 Bus powered devices require a compatible power supply.
NOTE 3 The device does not contain a power supply, intrinsic safety barrier, galvanic isolator or terminator.
NOTE 4 The MAU needs to draw at least the equivalent of its transmit power from the medium to ensure a positive
current on the medium throughout the transmit waveform (thereby keeping any polarity protection diodes in
connected MAUs forward biased).

Table 4 – CP 1/1: PhL selection of Clause 16 for devices and their MAUs
Clause Header Presence Constraints
16.1 General YES —
16.2 Tran
...