IEC 61784-2-15:2023

Industrial networks - Profiles - Part 2-15: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 - CPF 15

IEC 61784-2-15:2023 defines Communication Profile Family 15 (CPF 15). CPF 15 specifies a set of Real-Time Ethernet (RTE) communication profiles (CPs) and related network components based on the IEC 61158 series (Type 15), 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 2-15: Profils de bus de terrain supplémentaires pour les réseaux en temps réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 15

L’IEC 61784-2-15:2023 définit la famille de profils de communication 15 (CPF 15). La CPF 15 spécifie un ensemble de profils de communication (CP) Ethernet en temps réel (RTE, Real-Time Ethernet) et de composants de réseau associés basés sur la série IEC 61158 (type 15), 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

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 61784-2-15
®

Edition 1.0 2023-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial networks – Profiles –
Part 2-15: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –
CPF 15

Réseaux industriels – Profils –
Partie 2-15: Profils de bus de terrain supplémentaires pour les réseaux en temps
réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 15

IEC 61784-2-15:2023-05(en-fr)

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IEC 61784-2-15

®


Edition 1.0 2023-05




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Industrial networks – Profiles –

Part 2-15: Additional real-time fieldbus profiles based on ISO/IEC/IEEE 8802-3 –

CPF 15



Réseaux industriels – Profils –

Partie 2-15: Profils de bus de terrain supplémentaires pour les réseaux en


temps réel fondés sur l’ISO/IEC/IEEE 8802-3 – CPF 15













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 35.100.20; 35.240.50 ISBN 978-2-8322-6904-6



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 61784-2-15:2023 © 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 15 (MODBUS-RTPS) – RTE communication profiles . 9
4.1 General overview . 9
4.2 CP 15/1 . 9
4.2.1 Physical layer . 9
4.2.2 Data-link layer . 9
4.2.3 Application layer . 9
4.2.4 Performance indicator selection . 10
4.3 CP 15/2 . 14
4.3.1 Physical layer . 14
4.3.2 Data-link layer . 14
4.3.3 Application layer . 14
4.3.4 Performance indicator selection . 15
Bibliography . 20

Table 1 – CPF 15 symbols . 8
Table 2 – CP 15/1: AL service selection . 10
Table 3 – CP 15/1: AL protocol selection . 10
Table 4 – CP 15/1: PI overview . 10
Table 5 – CP 15/1: PI dependency matrix . 11
Table 6 – CP 15/2: AL service selection . 15
Table 7 – CP 15/2: AL protocol selection . 15
Table 8 – CP 15/2: PI overview . 15
Table 9 – CP 15/2: PI dependency matrix . 16

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IEC 61784-2-15:2023 © IEC 2023 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL NETWORKS –
PROFILES –

Part 2-15: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 15

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
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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 61784-2-15 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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– 4 – IEC 61784-2-15:2023 © IEC 2023
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 61784-2-15:2023 © 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 61784-2-15:2023 © IEC 2023
INDUSTRIAL NETWORKS –
PROFILES –

Part 2-15: Additional real-time fieldbus profiles
based on ISO/IEC/IEEE 8802-3 –
CPF 15



1 Scope
This part of IEC 61784-2 defines Communication Profile Family 15 (CPF 15). CPF 15 specifies
a set of Real-Time Ethernet (RTE) communication profiles (CPs) and related network
components based on the IEC 61158 series (Type 15), 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 61158-5-15:2010, Industrial communication networks – Fieldbus specifications – Part 5-15:
Application layer service definition – Type 15 elements
IEC 61158-6-15:2010, Industrial communication networks – Fieldbus specifications – Part 6-15:
Application layer protocol specification – Type 15 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
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

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IEC 61784-2-15:2023 © IEC 2023 – 7 –
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]
IETF RFC 1305, D. Mills, Network Time Protocol (Version 3) Specification, Implementation and
Analysis, March 1992, available at https://www.rfc-editor.org/info/rfc1305 [viewed 2022-02-18]
IETF RFC 2988, V. Paxson, M. Allman, Computing TCP's Retransmission Timer, November
2000, available at https://www.rfc-editor.org/info/rfc2988 [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]
nternet Assigned Numbers Authority
IANA I
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)
NoS Number of Switches
Phy PHY Physical layer entity sublayer (see ISO/IEC/IEEE 8802-3)
PI Performance indicator
RSTP Rapid Spanning Tree Algorithm and Protocol (see IEEE Std 802.1Q-2018)

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– 8 – IEC 61784-2-15:2023 © IEC 2023
RTO Retransmission Time Out
[according to IETF RFC 2988 – Computing TCP's Retransmission Timer]
RTPS Real-Time Publish-Subscribe
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 15 symbols
Symbol Definition Unit
D_size Data size octets
DT Delivery time µs
DT_lf Delivery time when a frame is lost µs
DT_lfh Delivery time when a frame is lost and the configuration is reliable with heartbeat µs
DT_lfp Delivery time when a frame is lost and the configuration is reliable periodic µs
DT_n Delivery time for the NACK message µs
H Period of the heartbeat, which is a configured parameter µs
N_Sw Number of switches between end-stations –
RTO TCP retransmission time out parameter µs
STT_r Stack traversal time of the receiver µs
STT_r1 Part of the stack traversal time of the receiver that is independent of D-size µs
STT_r2 Part of the stack traversal time of the receiver that depends linearly on D_size µs
STT_s Stack traversal time of the sender µs
STT_s1 Part of the stack traversal time of the sender that is independent of D_size µs
STT_s2 Part of the stack traversal time of the sender that depends linearly on D_size µs
T Period, which is a configured parameter µs
T_wire Time per octet on a wire segment µs
TD_Sw Time delay in switch µs

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

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IEC 61784-2-15:2023 © IEC 2023 – 9 –
4 CPF 15 (MODBUS-RTPS) – RTE communication profiles
4.1 General overview
Communication Profile Family 15 defines profiles based on ISO/IEC/IEEE 8802-3,
IETF RFC 791 (IP), IETF RFC 793 (TCP), IETF RFC 768 (UDP), IEC 61158-5-15 and
IEC 61158-6-15, which specify the communication system protocols commonly known as
1
Modbus® and Modbus TCP, and RTPS (Real-Time Publish-Subscribe).
In this document, the following communication profiles are specified for CPF 15:
– Profile 15/1
Is a profile using Modbus TCP
– Profile 15/2
Is a profile using RTPS.
For both profiles the communication is assumed to be full-duplex, with network topologies built
via switches.
These communication profiles can be active at the same time on the same device and network,
and as such they do not constitute alternative profiles, but can provide complementary and
concurrent functionality.
4.2 CP 15/1
4.2.1 Physical layer
The physical layer of CP 15/1 is as specified in ISO/IEC/IEEE 8802-3.
4.2.2 Data-link layer
The data-link layer of CP 15/1 is as specified in ISO/IEC/IEEE 8802-3.
4.2.3 Application layer
4.2.3.1 General
The application layer of CP 15/1 is mapped on TCP (IETF RFC 793), using TCP Port Number
502, registered with IANA, over IP (IETF RFC 791), as described in IEC 61158-5-15 and
IEC 61158-6-15.
4.2.3.2 AL service selection
The application layer services are defined in IEC 61158-5-15. Table 2 shows the subclauses
included in this profile.
___________
1 Modbus is a trademark of Schneider Automation Inc registered in the United States of America and other

countries. 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 trademark Modbus. Use of the trademark Modbus requires permission from Schneider Automation Inc.

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– 10 – IEC 61784-2-15:2023 © IEC 2023
Table 2 – CP 15/1: AL service selection
Clause Header Presence Constraints
Whole Application layer services definition (Type 15) Partial Subclauses qualified
document as Common or
Client/Server

4.2.3.3 AL protocol selection
The application layer protocols are defined in IEC 61158-6-15. Table 3 shows the subclauses
included in this profile.
Table 3 – CP 15/1: AL protocol selection
Clause Header Presence Constraints
Whole Application layer protocol specification (Type 15) Partial Subclauses qualified
document as Common or
Client/Server

4.2.4 Performance indicator selection
4.2.4.1 Performance indicator overview
Table 4 provides an overview of the CP 15/1 performance indicators.
Table 4 – CP 15/1: PI overview
Performance indicator Applicable Constraints
Delivery time YES —
Number of end-stations YES —
Basic network topology YES —
Number of switches between end-stations YES —
Throughput RTE YES —
Non-RTE bandwidth YES —
Time synchronization accuracy YES Provided with NTP (IETF RFC 1305)
Non-time-based synchronization accuracy YES —
Redundancy recovery time YES —

4.2.4.2 Performance indicator dependencies
4.2.4.2.1 Dependency matrix
Table 5 provides the CP 15/1 performance indicator dependency matrix.

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IEC 61784-2-15:2023 © IEC 2023 – 11 –
Table 5 – CP 15/1: PI dependency matrix
Influencing PI
Dependent PI
Delivery time NO YES YES NO NO NO NO YES
4.2.4.2.2 4.2.4.2.24 4.2.4.2.3 4.2.4.2.4
4.2.4.2.24
Number of NO NO YES NO NO NO NO NO
end-stations 4.2.4.2.5 4.2.4.2.6
Basic network NO YES YES NO NO NO NO NO
topology 4.2.4.2.7 4.2.4.2.8
Number of NO YES YES NO NO NO NO NO
switches 4.2.4.2.9 4.2.4.2.10
between
end-stations
Throughput NO NO NO NO YES NO NO YES
RTE 4.2.4.2.11 4.2.4.2.12 4.2.4.2.13
Non-RTE NO NO NO NO YES NO NO YES
bandwidth 4.2.4.2.14 4.2.4.2.15
Time NO NO YES YES NO NO NO YES
synchronization 4.2.4.2.16 4.2.4.2.17 4.2.4.2.18
accuracy
Non-time-based NO NO YES YES NO NO NO YES
synchronization 4.2.4.2.19 4.2.4.2.20 4.2.4.2.21
accuracy
Redundancy NO NO YES YES NO NO NO NO
recovery time 4.2.4.2.22 4.2.4.2.23

4.2.4.2.2 Delivery time and basic network topology
The following network topologies are supported:
• Star,
• Linear (embedded or bus),
• Ring,
• Redundant ring,
• Mesh.
The network topology influences the delivery time indirectly by influencing the number of
switches to be traversed and the queuing and
...