IEC 61784-2-20:2023

Industrial networks - Profiles - Part 2-20: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 - CPF 20

IEC 61784-2-20:2023 defines Communication Profile Family 20 (CPF 20). CPF 20 specifies a set of Real-Time Ethernet (RTE) communication profiles (CPs) and related network components based on the IEC 61158 series (Type 25), 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.

Réseaux industriels - Profils - Partie 2-20: Profils de bus de terrain supplémentaires pour les réseaux en temps réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 20

L’IEC 61784-2-20:2023 définit la famille de profils de communication 20 (CPF 20). La CPF 20 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 25), l’ISO/IEC/IEEE 8802-3 et d’autres normes.
Pour chaque profil de communication RTE, le présent document spécifie également les indicateurs de performance RTE correspondants et les dépendances entre ces indicateurs de performance RTE.
NOTE 1 Tous les CP sont fondés sur des normes ou projets de normes, ou des Normes internationales, publiés par l’IEC, ou bien sur des normes ou des Normes internationales établies par d’autres organismes de normalisation ou des processus de normalisation ouverts.
NOTE 2 Les profils de communication RTE utilisent les réseaux de communication ISO/IEC/IEEE 8802-3 et leurs composants de réseau connexes et amendent dans certains cas ces normes, pour obtenir les fonctions RTE.

General Information

• Status: Published
• Publication Date: 04-May-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: 05-May-2023

Standards Content (Sample)

IEC 61784-2-20
®

Edition 1.0 2023-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial networks – Profiles –
Part 2-20: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –
CPF 20

Réseaux industriels – Profils –
Partie 2-20: Profils de bus de terrain supplémentaires pour les réseaux en temps
réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 20

IEC 61784-2-20:2023-05(en-fr)

---------------------- Page: 1 ----------------------
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IEC 61784-2-20

®


Edition 1.0 2023-05




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Industrial networks – Profiles –

Part 2-20: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –

CPF 20



Réseaux industriels – Profils –

Partie 2-20: Profils de bus de terrain supplémentaires pour les réseaux en


temps réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 20













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 35.100.20; 35.240.50 ISBN 978-2-8322-6913-8




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

---------------------- Page: 3 ----------------------
– 2 – IEC 61784-2-20:2023 © 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 20 (ADS-net) – RTE communication profiles . 10
4.1 General overview . 10
4.2 CP 20/1 . 10
4.2.1 Physical layer . 10
4.2.2 Data link layer . 10
4.2.3 Application layer . 10
4.2.4 Performance indicator selection . 12
4.3 CP 20/2 . 15
4.3.1 Physical layer . 15
4.3.2 Data link layer . 15
4.3.3 Application layer . 15
4.3.4 Performance indicator selection . 17
Annex A (informative) CPF 20 (ADS-net) – Performance Indicator calculation . 21
A.1 Profile 20/1 . 21
A.1.1 Delivery time . 21
A.1.2 RTE throughput . 21
A.1.3 Non-RTE bandwidth . 22
A.2 Profile 20/2 . 22
A.2.1 Delivery time . 22
A.2.2 RTE throughput . 23
A.2.3 Non-RTE bandwidth . 23
Bibliography . 24

Table 1 – CPF 20 symbols . 9
Table 2 – CP 20/1: DLL service selection . 10
Table 3 – CP 20/1: DLL protocol selection . 10
Table 4 – CP 20/1: AL service selection . 11
Table 5 – CP 20/1: AL protocol selection . 11
Table 6 – CP 20/1: performance indicator overview . 12
Table 7 – CP 20/1: Performance indicator dependency matrix . 12
Table 8 – VLAN priority mapping of CP20/1 network . 13
Table 9 – CP 20/1: Consistent set of performance indicators . 15
Table 10 – CP 20/2: AL service selection . 16

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IEC 61784-2-20:2023 © IEC 2023 – 3 –
Table 11 – CP 20/2: AL protocol selection . 16
Table 12 – CP 20/2: Performance indicator overview . 17
Table 13 – CP 20/2: Performance indicator dependency matrix . 17
Table 14 – CP 20/2: Consistent set of performance indicators . 20

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– 4 – IEC 61784-2-20:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL NETWORKS –
PROFILES –

Part 2-20: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 20

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
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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 61784-2-20 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
fourth edition of IEC 61784-2 published in 2019. This first edition constitutes a technical revision.

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IEC 61784-2-20:2023 © IEC 2023 – 5 –
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.
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 61784-2-20:2023 © 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 61784-2-20:2023 © IEC 2023 – 7 –
INDUSTRIAL NETWORKS –
PROFILES –

Part 2-20: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 20



1 Scope
This part of IEC 61784-2 defines Communication Profile Family 20 (CPF 20). CPF 20 specifies
a set of Real-Time Ethernet (RTE) communication profiles (CPs) and related network
components based on the IEC 61158 series (Type 25), 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.
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 61158-3-25:2019, Industrial communication networks – Fieldbus specifications – Part 3-25:
Data-link layer service definition – Type 25 elements
IEC 61158-4-25:2019, Industrial communication networks – Fieldbus specifications – Part 4-25:
Data-link layer protocol specification – Type 25 elements
IEC 61158-5-25:2019, Industrial communication networks – Fieldbus specifications – Part 5-25:
Application layer service definition – Type 25 elements
IEC 61158-6-25:2019, Industrial communication networks – Fieldbus specifications – Part 6-25:
Application layer protocol specification – Type 25 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
ISO/IEC/IEEE 8802-3, Telecommunications and exchange between information technology
systems – Requirements for local and metropolitan area networks – Part 3: Standard for
Ethernet

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– 8 – IEC 61784-2-20:2023 © 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
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)
PI Performance indicator
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)

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IEC 61784-2-20:2023 © IEC 2023 – 9 –
3.3 Symbols
For the purposes of this document, symbols defined in IEC 61784-2-0 and Table 1 apply.
NOTE Definitions of symbols in this Subclause 3.3 do not use the italic font, as they are already identified as
symbols.
Table 1 – CPF 20 symbols
Symbol Description Unit
BW Total bandwidth %
BW %
Non-RTE bandwidth
NRTE
BW %
RTE bandwidth
RTE
CD Cable segment delay μs
CL Cable length km
DL μs
Delay of RTE frame on sender node
CY
DL μs
Delay of Non-RTE frame on sender node
NCY
DL μs
Delay of receiver node
R
DL μs
Delay of sender node
S
DT Delivery time of RTE μs
F -
The number of frames in the RTE
N
M  The number of nodes sending RTE frame -
MC octet
Common memory capacity
RTE
N The number of nodes between sending and receiving end-stations -
PD  Cable propagation delay μs
P μs
Protocol overhead
OH
q The number packets in the port transmit queue μs
RD μs
Delay of hardware receiving process
HD
SD μs
Delay of sending process by firmware
FM
SD μs
Delay of sending process by hardware
HD
SD μs
Sender stack delay
s
SD μs
Receiver stack delay
r
SL Switch latency μs
SPD  Switch processing delay μs
ST ms
Communication cycle time
RTE
T  μs
Transmit time of control and information communication packet
CI
T μs
Transmit time of ring control communication packet
CN
T μs
Transmit time of cyclic communication packet
CY
TR μs
Throughput RTE
RTE
T μs
Transmit time of target packet
X
T μs
Transmit time of packet j
X_j

3.4 Conventions
For the purposes of this document, the conventions defined in IEC 61784-2-0 apply.

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– 10 – IEC 61784-2-20:2023 © IEC 2023
1
4 CPF 20 (ADS-net ) – RTE communication profiles
4.1 General overview
Communication Profile Family 20 defines profiles based on ISO/IEC/IEEE 8802-3,
IEC 61158-3-25, IEC 61158-4-25, IEC 61158-5-25, and IEC 61158-6-25 which specify the
communication system protocols commonly known as ADS-net.
In this document, the following communication profiles are specified for CPF 20:
– Profile 20/1
1
A profile using ADS-net technology in a ring topology (ADS-net/μΣNETWORK-1000 ),
– Profile 20/2
1
A profile using ADS-net technology in a star / linear topology (ADS-net/NX ).
4.2 CP 20/1
4.2.1 Physical layer
The physical layer of CP 20/1 is as specified in ISO/IEC/IEEE 8802-3.
4.2.2 Data link layer
4.2.2.1 DLL service selection
DLL services are defined in IEC 61158-3-25. Table 2 shows the subclauses included in this
profile.
Table 2 – CP 20/1: DLL service selection
Clause Header Presence Constraints
Whole document Data link service definition (Type 25) YES –

4.2.2.2 DLL protocol selection
DLL protocols are defined in IEC 61158-4-25. Table 3 shows the subclauses included in this
profile.
Table 3 – CP 20/1: DLL protocol selection
Clause Header Presence Constraints
Whole document Data link protocol specification (Type 25) YES –

4.2.3 Application layer
4.2.3.1 AL service selection
Application Layer services are defined in IEC 61158-5-25. Table 4 shows the subclauses
included in this profile.
___________
1
 In Japan, μΣNETWORK-1000 is the trade name of Hitachi. 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 profile does not require use of the trade name μΣNETWORK-1000. Use of the trade name
μΣNETWORK-1000 requires permission of the trade name holder. ADS-net, ADS-net/μΣNETWORK-1000 and
ADS-net/NX are used to describe the communication concept specified in Type 25 and the profiles in CPF 20.

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IEC 61784-2-20:2023 © IEC 2023 – 11 –
Table 4 – CP 20/1: AL service selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references YES —
3 Terms, definitions, symbols and abbreviations Partial Used if needed
4 Concept YES —
5 Data type ASE Partial Used if needed
6 Communication model specification — —
6.1 Communication model YES —
6.2 ASE type S YES —
6.3 ASE type N NO —
6.4 AR type S YES —
6.5 AR type N NO —

4.2.3.2 AL protocol selection
Application Layer protocols are defined in IEC 61158-6-25. Table 5 shows the subclauses
included in this profile.
Table 5 – CP 20/1: AL protocol selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references YES —
3 Terms, definitions, symbols and abbreviations Partial Used if needed
4 FAL syntax description — —
4.1 FALPDU type S abstract syntax YES —
4.2 FALPDU type N a
...