IEC 61784-2-17:2023

Industrial networks - Profiles - Part 2-17: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 - CPF 17

IEC 61784-2-17:2023 defines Communication Profile Family 17 (CPF 17). CPF 17 specifies a Real-Time Ethernet (RTE) communication profile (CP) and related network components based on the IEC 61158 series (Type 21), 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 profile uses 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 2-17: Profils de bus de terrain supplémentaires pour les réseaux en temps réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 17

L’IEC 61784-2-17:2023 définit la famille de profils de communication 17 (CPF 17). La CPF 17 spécifie un profil de communication (CP) Ethernet en temps réel (RTE, Real-Time Ethernet) et des composants de réseau associés basés sur la série IEC 61158 (Type 21), 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 Le profil de communication RTE utilise les réseaux de communication ISO/IEC/IEEE 8802-3 et leurs composants de réseau connexes et amende 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

Relations

• Replaces: IEC 61784-2:2019 - Industrial communication networks - Profiles - Part 2: Additional fieldbus profiles for real-time networks based on ISO/IEC/IEEE 8802-3
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61784-2-17
®

Edition 1.0 2023-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial networks – Profiles –
Part 2-17: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –
CPF 17

Réseaux industriels – Profils –
Partie 2-17: Profils de bus de terrain supplémentaires pour les réseaux en temps
réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 17

IEC 61784-2-17:2023-05(en-fr)

---------------------- Page: 1 ----------------------
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IEC 61784-2-17

®


Edition 1.0 2023-05




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Industrial networks – Profiles –

Part 2-17: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –

CPF 17



Réseaux industriels – Profils –

Partie 2-17: Profils de bus de terrain supplémentaires pour les réseaux en


temps réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 17













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 35.100.20; 35.240.50 ISBN 978-2-8322-6906-0




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

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

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

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– 2 – IEC 61784-2-17:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, abbreviated terms, acronyms, and conventions . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms and acronyms . 7
3.3 Symbols . 8
3.4 Conventions . 8
4 CPF 17 (RAPIEnet) – RTE communication profiles . 9
4.1 General overview . 9
4.2 CP 17/1 . 9
4.2.1 Physical layer . 9
4.2.2 Datalink layer . 9
4.2.3 Application layer . 10
4.2.4 Performance indicator selection . 11
Bibliography . 16

Table 1 – CPF 17 symbols . 8
Table 2 – CPF 17: Overview of profile sets . 9
Table 3 – CP 17/1: DLL service selection . 9
Table 4 – CP 17/1: DLL protocol selection . 10
Table 5 – CP 17/1: AL service selection . 10
Table 6 – CP 17/1: AL protocol selection . 10
Table 7 – CP 17/1: PI overview . 11
Table 8 – CP 17/1: PI dependency matrix . 11
Table 9 – Consistent set of PIs small size automation system . 15
Table 10 – Parameters for Calculation of Consistent set of PIs . 15

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IEC 61784-2-17:2023 © IEC 2023 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL NETWORKS –
PROFILES –

Part 2-17: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 17

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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 61784-2-17 has been prepared by subcommittee 65C: Industrial networks, of IEC
technical committee 65: Industrial-process measurement, control and automation. It is an
International Standard.

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– 4 – IEC 61784-2-17:2023 © IEC 2023
This first edition, together with the other parts of the same series, cancels and replaces the
fourth edition of IEC 61784-2 published in 2019. This first edition constitutes a technical
revision.
This edition includes the following significant technical changes with respect to
IEC 61784-2:2019:
a) split of the original IEC 61784-2 into several subparts, one subpart for the material of a
generic nature, and one subpart for each Communication Profile Family specified in the
original document.
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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IEC 61784-2-17:2023 © IEC 2023 – 5 –
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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– 6 – IEC 61784-2-17:2023 © IEC 2023
INDUSTRIAL NETWORKS –
PROFILES –

Part 2-17: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 17



1 Scope
This part of IEC 61784-2 defines Communication Profile Family 17 (CPF 17). CPF 17
specifies a Real-Time Ethernet (RTE) communication profile (CP) and related network
components based on the IEC 61158 series (Type 21), 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 profile uses 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 61158-3-21:2019, Industrial communication networks – Fieldbus specifications –
Part 3-21: Data-link layer service definition – Type 21 elements
IEC 61158-4-21:2023, Industrial communication networks – Fieldbus specifications –
Part 4-21: Data-link layer protocol specification – Type 21 elements
IEC 61158-5-21:2019, Industrial communication networks – Fieldbus specifications –
Part 5-21: Application layer service definition – Type 21 elements
IEC 61158-6-21:2019, Industrial communication networks – Fieldbus specifications –
Part 6-21: Application layer protocol specification – Type 21 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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IEC 61784-2-17:2023 © IEC 2023 – 7 –
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)
n.a. Not applicable
Phy PHY Physical layer entity sublayer (see ISO/IEC/IEEE 8802-3)
PI Performance indicator
pps Packets per second
RSTP Rapid Spanning Tree Algorithm and Protocol (see IEEE Std 802.1Q-2018)

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– 8 – IEC 61784-2-17:2023 © IEC 2023
TCP Transmission Control Protocol (see IETF RFC 793)
UDP User Datagram Protocol (see IETF RFC 768)
3.3 Symbols
For the purposes of this document, symbols defined in IEC 61784-2-0 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 17 symbols
Symbol Definition Unit
APDUsize Size of the application protocol data unit in octets octets
BW Non-RTE bandwidth, in % %
NRTE
LDR Link data rate in bit per seconds bps
LTC Total cable length in meter m
M Number packets in the port transmit queue of node i in front on of this packet –
N Number of nodes between sending and receiving end-stations –
NF Maximum number of frames allowed to be sent per second for one end station pps
E/S_MAX
NF Number of frames allowed to be sent per second for one RTE end station pps
RTE/S
Posize Size of the protocol overhead in octets octets
T Cable propagation delay time in microseconds µs
CPD
T Cable propagation delay in nanoseconds per meter (depending on the ns/m
CPD/M
characteristics of the selected cable)
T Delivery time in microseconds µs
DELAY
T Maximum delivery time in microseconds µs
DELAY_MAX
T Minimum delivery time in microseconds µs
DELAY_MIN
Throughput_R Throughput RTE octets/s
TE
Throughput_R Maximum throughput RTE octets/s
TE
MAX
T Node latency delay time in microseconds µs
NLD
T Node latency delay time of node i in microseconds µs
NLD_i
T Node propagation delay time in microseconds µs
NPD
T Node propagation delay time of node i in microseconds µs
NPD_i
T Packet transmit time in microseconds µs
PKT
T Packet transmit time of node i in microseconds µs
PKT_i
T Receiver stack traversal time including Phy and MAC in microseconds µs
RCV
T Sender stack traversal time including Phy and MAC in microseconds µs
SND
T Packet transmit time of packet j in microseconds in the port transmit queue of node µs
TX_PKT_ij
i in front on of this packet (depending on APDU size of node i)
T Packet transmit time of packet j in microseconds in the port transmit queue in front µs
TX_PKT_j
on of this packet (depending on APDU size of node i)

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

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IEC 61784-2-17:2023 © IEC 2023 – 9 –
4 CPF 17 (RAPIEnet) – RTE communication profiles
4.1 General overview
Communication Profile Family 17 (CPF 17) defines one communication profile based on the
IEC 61158 series protocol Type 21. This profile corresponds to the communication system
commonly known as RAPIEnet.
• Profile 17/1 (RAPIEnet)
This profile is based on ISO/IEC/IEEE 8802-3 (Ethernet) MAC and physical layers and
selections of AL, and DLL services and protocol definitions from the IEC 61158 series
Type 21.
Table 2 shows the overview of RAPIEnet profile set.
Table 2 – CPF 17: Overview of profile sets
Layer Profile 17/1
Application IEC 61158-5-21, IEC 61158-6-21
Data-link IEC 61158-3-21, IEC 61158-4-21
Physical ISO/IEC/IEEE 8802-3

4.2 CP 17/1
4.2.1 Physical layer
The physical layer shall be according to ISO/IEC/IEEE 8802-3.
The data rate shall be at least 100 Mbit/s and full-duplex mode shall be used at least for one
port.
The auto negotiation and crossover function (see ISO/IEC/IEEE 8802-3) shall be used.
4.2.2 Datalink layer
4.2.2.1 DLL services selection
Table 3 specifies the DLL service selection within IEC 61158-3-21.
Table 3 – CP 17/1: DLL service selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references YES —
3 Terms, definitions, symbols, abbreviations and Partial If applicable
conventions
4 Data-link layer services and concepts YES —
5 Data-link management services YES —
6 MAC control service YES —
7 Ph-control service YES —

4.2.2.2 DLL protocol selection
Table 4 specifies the DLL protocol selection within IEC 61158-4-21.

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– 10 – IEC 61784-2-17:2023 © IEC 2023
Table 4 – CP 17/1: DLL protocol selection
Clause Header Presence Constraints
1
Scope YES —
2
Normative references YES —
3
Terms, definitions, symbols and abbreviations Partial If applicable
4
Overview of the data-link protocol YES —
5
General structure and encoding YES —
6
DLPDU structure and procedure YES —
7
DLE elements of procedure YES —
8
Constants and error codes YES —

4.2.3 Application layer
4.2.3.1 AL service selection
Table 5 specifies the AL service selection within IEC 61158-5-21.
Table 5 – CP 17/1: AL service selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references YES —
3 Terms, definitions, symbols, abbreviations, and Partial If applicable
conventions
4 Concepts YES —
5 Data type ASE YES —
6 Communication model specification YES —

4.2.3.2 AL protocol selection
Table 6 specifies the AL protocol selection within IEC 61158-6-21.
Table 6 – CP 17/1: AL protocol selection
Clause Header Presence Constraints
1 Scope YES —
2 Normative references YES —
Terms, definitions, symbols, abbreviations, and
3 Partial If applicable
conventions
4 FAL syntax description YES —
5 Transfer Syntax YES —
6 FAL protocol state machines YES —
7 AP context state machine YES —
8 FAL service protocol machine YES —
9 AR protocol machine YES —
10 DLL mapping protocol machine YES —

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IEC 61784-2-17:2023 © IEC 2023 – 11 –
4.2.4 Performance indicator selection
4.2.4.1 Performance indicator overview
Table 7 shows the performance indicators overview of CP 17/1.
Table 7 – CP 17/1: PI overview
Performance indicator Applicable Constraints
Delivery Time YES None
Number of end stations YES None
Basic network topology YES None
Not practically limited by the
Number of switches between end stations RAPIEnet nodes are 2-port switches
protocol
Throughput RTE YES None
Non-RTE bandwidth YES None
Time synchronization accuracy YES None
Non time-based synchronization accuracy NO None
Redundancy recovery time YES None

4.2.4.2 Performance indicator dependencies
4.2.4.2.1 Performance indicator dependency matrix
Table 8 shows the dependencies between performance indicators for CP 17/1.
Table 8 – CP 17/1: PI dependency matrix
Influencing PI
Dependent PI
Delivery time YES NO YES NO NO NO
Number of end
YES NO NO NO NO NO
stations
Basic network
NO NO NO NO NO YES
topology
Throughput RTE NO NO NO YES NO NO
Non-RTE bandwidth NO NO NO YES NO NO
Time synchronization
NO YES NO NO NO NO
accuracy
Redundancy recovery
NO YES YES YES NO NO
time

Delivery time
Number of end
stations
Basic network
topology
Throughput
RTE
Non-RTE
bandwidth
Time
synchronization
accuracy
Redundancy
recovery time

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