EN IEC 62439-2:2022
(Main)Industrial communication networks - High availability automation networks - Part 2: Media Redundancy Protocol (MRP)
Industrial communication networks - High availability automation networks - Part 2: Media Redundancy Protocol (MRP)
IEC 62439-2:2021 is applicable to high-availability automation networks based on the ISO/IEC/IEEE 8802-3 (IEEE Std 802.3) (Ethernet) technology. The IEC 62439-2:2021 specifies a recovery protocol based on a ring topology, designed to react deterministically on a single failure of an inter-switch link or switch in the network, under the control of a dedicated media redundancy manager node.
Industrielle Kommunikationsnetze: Hochverfügbare Automatisierungsnetze - Teil 2: Medienredundanz-Protokoll (MRP)
Réseaux de communication industriels – Réseaux de haute disponibilité pour l'automatisation – Partie 2: Protocole de redondance du support (MRP)
IEC 62439-2:2021 s'applique aux réseaux de haute disponibilité pour l'automatisation qui reposent sur la technologie ISO/IEC/IEEE 8802-3 (IEEE Std 802.3) (Ethernet). L'IEC 62439-2:2021 spécifie un protocole de reprise reposant sur une topologie en anneau, qui est conçu pour réagir de manière déterministe en cas de défaillance unique sur une maille interétage ou sur un commutateur du réseau, sous le contrôle d'un nœud du gestionnaire de redondance du support dédié.
Industrijska komunikacijska omrežja - Omrežja za avtomatizacijo z visoko razpoložljivostjo - 2. del: Protokol z redundanco medijev (MRP) (IEC 62439-2:2021)
Standardi iz skupine IEC 62439 se uporabljajo za avtomatizacijska omrežja z visoko razpoložljivostjo, ki temeljijo na tehnologiji iz standarda ISO/IEC/IEEE 8802-3 (IEEE 802.3) (Ethernet).
Ta del skupine standardov IEC 62439 določa obnovitveni protokol, ki temelji na obročni topologiji, ki je zasnovana za determinističen odziv pri posamezni okvari povezave med stikali ali stikali v omrežju pod nadzorom dodeljenega vozlišča upravitelja redundance medijev.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2022
Nadomešča:
SIST EN 62439-2:2018
SIST EN 62439-2:2018/AC:2018
Industrijska komunikacijska omrežja - Omrežja za avtomatizacijo z visoko
razpoložljivostjo - 2. del: Protokol z redundanco medijev (MRP) (IEC 62439-2:2021)
Industrial communication networks - High availability automation networks - Part 2:
Media Redundancy Protocol (MRP) (IEC 62439-2:2021)
Industrielle Kommunikationsnetze: Hochverfügbare Automatisierungsnetze - Teil 2:
Medienredundanz-Protokoll (MRP) (IEC 62439-2:2021)
Réseaux industriels de communication - Réseaux d'automatisme à haute disponibilité -
Partie 2: Media Redudancy Protocol (MRP) (IEC 62439-2:2021)
Ta slovenski standard je istoveten z: EN IEC 62439-2:2022
ICS:
25.040.01 Sistemi za avtomatizacijo v Industrial automation
industriji na splošno systems in general
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 62439-2
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2022
ICS 25.040.40; 35.100.05 Supersedes EN 62439-2:2017 and all of its amendments
and corrigenda (if any)
English Version
Industrial communication networks - High availability automation
networks - Part 2: Media Redundancy Protocol (MRP)
(IEC 62439-2:2021)
Réseaux de communication industriels - Réseaux de haute Industrielle Kommunikationsnetze: Hochverfügbare
disponibilité pour l'automatisation - Partie 2: Protocole de Automatisierungsnetze - Teil 2: Medienredundanz-Protokoll
redondance du support (MRP) (MRP)
(IEC 62439-2:2021) (IEC 62439-2:2021)
This European Standard was approved by CENELEC on 2022-01-19. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62439-2:2022 E
European foreword
The text of document 65C/1118/FDIS, future edition 3 of IEC 62439-2, prepared by SC 65C "Industrial
networks" of IEC/TC 65 "Industrial-process measurement, control and automation" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 62439-2:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-10-19
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-01-19
document have to be withdrawn
This document supersedes EN 62439-2:2017 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62439-2:2021 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 61158-1 NOTE Harmonized as EN IEC 61158-1
IEC 61784-1 NOTE Harmonized as EN IEC 61784-1
IEC 61784-2 NOTE Harmonized as EN IEC 61784-2
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-192 - International Electrotechnical - -
Vocabulary (IEV) - Part 192:
Dependability
IEC 61158-6-10 2019 Industrial communication networks - EN IEC 61158-6-10 2019
Fieldbus specifications - Part 6-10:
Application layer protocol specification
- Type 10 elements
IEC 62439-1 2010 Industrial communication networks - EN 62439-1 2010
High availability automation networks -
Part 1: General concepts and
calculation methods
AMD1 2012 A1 2012
AMD2 2016 A2 2017
ISO/IEC 10164-1 Information technology - Open - -
Systems Interconnection - Systems
Management: Object Management
Function
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 802.1Q 2018 IEEE Standard for Local and - -
Metropolitan Area Network - Bridges
and Bridged Networks
IEEE Std 802.3 2018 IEEE Standard for Ethernet - -
IEC 62439-2 ®
Edition 3.0 2021-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – High availability automation networks –
Part 2: Media Redundancy Protocol (MRP)
Réseaux de communication industriels – Réseaux de haute disponibilité pour
l'automatisation –
Partie 2: Protocole de redondance du support (MRP)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-1057-3
– 2 – IEC 62439-2:2021 © IEC 2021
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
1.1 General . 10
1.2 Code component distribution . 10
2 Normative references . 11
3 Terms, definitions, abbreviated terms and conventions . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms . 12
3.3 Conventions . 12
4 MRP Overview . 12
5 MRP Media redundancy behavior . 16
5.1 General . 16
5.2 Ring ports . 16
5.3 Media Redundancy Manager (MRM) . 17
5.4 Media Redundancy Client (MRC) . 19
5.5 Redundancy domain . 19
5.6 Media Link Check . 19
5.7 Application of the Continuity Check protocol . 20
5.7.1 General . 20
5.7.2 Continuity Check Message Interval . 20
5.7.3 Maintenance Domain Level . 20
5.7.4 Maintenance Association ID (MAID) . 20
5.7.5 Maintenance Association End Point ID (MEPID) . 21
5.7.6 Sender ID TLV . 21
5.7.7 Port Status TLV . 21
5.7.8 Interface Status TLV . 21
5.8 Usage with diagnosis and alarms . 21
5.9 Ring diagnosis . 22
5.10 Multiple MRM in a single ring: Manager voting option . 22
5.10.1 General . 22
5.10.2 Basic principle of the manager voting process . 23
5.10.3 The manager voting process . 24
5.11 BLOCKED not supported (Option) . 26
5.12 Interconnection port . 26
5.13 Media redundancy Interconnection Manager (MIM) . 28
5.14 Media redundancy Interconnection Client (MIC) . 30
5.15 Interconnection domain . 31
5.16 Interconnection diagnosis . 31
6 MRP Class specification . 31
6.1 General . 31
6.2 Template. 32
6.2.1 Media redundancy template . 32
6.2.2 Media redundancy Interconnection template . 33
6.3 Attributes . 34
7 MRP Service specification . 38
IEC 62439-2:2021 © IEC 2021 – 3 –
7.1 Start MRM . 38
7.2 Stop MRM . 39
7.3 State Change . 40
7.4 Start MRC . 41
7.5 Stop MRC . 42
7.6 Read MRM . 43
7.7 Read MRC . 45
7.8 Start MIM . 46
7.9 Stop MIM . 48
7.10 Interconnection State Change . 49
7.11 Start MIC . 49
7.12 Stop MIC. 51
7.13 Read MIM . 52
7.14 Read MIC . 53
8 MRP protocol specification . 55
8.1 PDU description . 55
8.1.1 Basic data types . 55
8.1.2 DLPDU abstract syntax reference . 55
8.1.3 Coding of the DLPDU field SourceAddress . 56
8.1.4 Coding of the DLPDU field DestinationAddress . 56
8.1.5 Coding of the field TagControlInformation . 56
8.1.6 Coding of the field LT . 57
8.1.7 MRP APDU abstract syntax . 57
8.1.8 Coding of the field MRP_TLVHeader . 59
8.1.9 Coding of the field MRP_SubTLVHeader . 59
8.1.10 Coding of the field MRP_Ed1Type and MRP_Ed1ManufacturerData . 60
8.1.11 Coding of the field MRP_Version . 60
8.1.12 Coding of the field MRP_SequenceID . 60
8.1.13 Coding of the field MRP_SA . 60
8.1.14 Coding of the field MRP_OtherMRMSA . 61
8.1.15 Coding of the field MRP_Prio . 61
8.1.16 Coding of the field MRP_OtherMRMPrio . 61
8.1.17 Coding of the field MRP_PortRole . 61
8.1.18 Coding of the field MRP_RingState . 62
8.1.19 Coding of the field MRP_Interval . 62
8.1.20 Coding of the field MRP_Transition . 62
8.1.21 Coding of the field MRP_TimeStamp . 62
8.1.22 Coding of the field MRP_Blocked . 63
8.1.23 Coding of the field MRP_ManufacturerOUI . 63
8.1.24 Coding of the field MRP_IECOUI . 63
8.1.25 Coding of the field MRP_ManufacturerData . 63
8.1.26 Coding of the field MRP_DomainUUID . 63
8.1.27 Coding of the field MRP_InState . 64
8.1.28 Coding of the field MRP_InID . 64
8.1.29 Coding of the field MRP_LinkInfo . 64
8.2 Protocol machines . 64
8.2.1 MRM protocol machine . 64
8.2.2 MRC protocol machine . 75
8.2.3 MRA protocol machine . 81
– 4 – IEC 62439-2:2021 © IEC 2021
8.2.4 MRA, MRM and MRC functions . 102
8.2.5 FDB clear timer . 106
8.2.6 Topology change timer . 106
8.2.7 MIM protocol machine . 107
8.2.8 MIC protocol machine . 115
8.2.9 MIM and MIC functions . 122
8.2.10 Interconnection Topology Change timer . 127
8.2.11 Interconnection Link Status Poll timer . 127
9 MRP installation, configuration and repair. 128
9.1 Ring port and Interconnection port parameters . 128
9.2 Ring topology parameters . 128
9.3 MRM parameters . 129
9.4 MRC parameters and constraints . 129
9.5 MRA compatibility to earlier Automanager protocol version . 130
9.6 Interconnection topology parameters . 130
9.7 MIM parameters . 130
9.8 MIC parameters and constraints . 131
9.9 Calculation of MRP ring recovery time . 132
9.9.1 Overview . 132
9.9.2 Deduction of formula . 132
9.9.3 Worst-case calculation for recovery time of 10 ms . 134
9.9.4 Worst-case calculation for 50 devices . 135
9.10 Calculation of MRP Automanager voting time . 135
9.11 Calculation of MRP Interconnection recovery time . 135
10 MRP Management Information Base (MIB) . 137
10.1 General . 137
10.2 MRP MIB with a monitoring view . 137
10.3 MRP MIB with a management and monitoring view . 151
Annex A (normative) Optional earlier version of the Automanager protocol . 166
Annex B (informative) Timing considerations for 10 Mbit/s link speed . 167
Annex C (informative) Using MRP together with scheduling and shaping mechanisms
as defined in IEEE Std 802.1Q and interspersing express traffic as defined in
IEEE Std 802.3 . 169
C.1 General . 169
C.2 Avoiding negative impact on the recovery time of an MRP ring . 169
C.2.1 General . 169
C.2.2 Interspersing express traffic . 169
C.2.3 Enhancements for scheduled traffic . 170
C.3 Configuration guidelines for increased performance of MRP . 170
C.3.1 General . 170
C.3.2 Interspersing express traffic . 170
C.3.3 Enhancements for scheduled traffic . 171
C.4 Calculation of MRP ring recovery time . 171
C.4.1 Worst-case calculation for recovery time of 10 ms, using frame
preemption . 171
C.4.2 Worst-case calculation for 50 devices, using frame preemption . 172
Annex D (informative) Advanced MRP and MRP Interconnection topologies . 173
D.1 General . 173
D.2 MRP Single Switch Multiple Rings (MRP-SSMR) . 173
IEC 62439-2:2021 © IEC 2021 – 5 –
D.3 Multiple MRP Interconnection . 173
D.4 MRP Interconnection Dual Switch Multiple Couplings (MRP-I DSMC) . 174
Bibliography . 175
Figure 1 – Two MRP rings redundantly connected via MRP Interconnection . 14
Figure 2 – MRP stack . 16
Figure 3 – MRP ring topology with one manager and clients . 17
Figure 4 – MRP open ring with MRM . 18
Figure 5 – MRP ring with MRA at network startup . 23
Figure 6 – MRP ring after the manager voting process . 23
Figure 7 – Manager voting process . 25
Figure 8 – MRA located outside the MRP ring . 26
Figure 9 – MRP Interconnection topology . 28
Figure 10 – MRP ring interconnection open . 29
Figure 11 – MRP protocol machine for MRM . 65
Figure 12 – MRP protocol machine for MRC . 76
Figure 13 – MRP protocol machine for MRA. 82
Figure 14 – MRP protocol machine for MIM in RC-mode and LC-mode . 107
Figure 15 – MRP protocol machine for MIC in RC-mode and LC-mode. 115
Figure D.1 – MRP Topologies . 173
Figure D.2 – MRP Interconnection Topologies . 174
Figure D.3 – MRP Interconnection Dual Switch Multiple Couplings Topology . 174
Table 1 – Coding of the Maintenance Association ID (MAID). 21
Table 2 – MRP Start MRM . 38
Table 3 – MRP Stop MRM . 40
Table 4 – MRP Change State . 40
Table 5 – MRP Start MRC . 41
Table 6 – MRP Stop MRC . 42
Table 7 – MRP Read MRM. 43
Table 8 – MRP Read MRC . 45
Table 9 – MRP Start MIM . 47
Table 10 – MRP Stop MIM . 48
Table 11 – MRP Interconnection Change State . 49
Table 12 – MRP Start MIC . 50
Table 13 – MRP Stop MIC . 51
Table 14 – MRP Read MIM . 52
Table 15 – MRP Read MIC . 54
Table 16 – MRP DLPDU syntax for ISO/IEC/IEEE 8802-3 (IEEE Std 802.3) . 55
Table 17 – MRP OUI . 56
Table 18 – MRP MulticastMACAddress . 56
Table 19 – MRP TagControlInformation.Priority field . 57
Table 20 – MRP LT field . 57
Table 21 – MRP APDU syntax . 57
– 6 – IEC 62439-2:2021 © IEC 2021
Table 22 – MRP Substitutions . 58
Table 23 – MRP_TLVHeader.Type . 59
Table 24 – MRP_SubTLVHeader.Type . 59
Table 25 – MRP_Ed1Type and MRP_Ed1ManufacturerData . 60
Table 26 – MRP_Ed1Type and MRP_Ed1ManufacturerData . 60
Table 27 – MRP_Version . 60
Table 28 – Coding of the field MRP_OtherMRMSA . 61
Table 29 – MRP_Prio . 61
Table 30 – Coding of the field MRP_OtherMRMPrio . 61
Table 31 – MRP_PortRole . 62
Table 32 – MRP_RingState . 62
Table 33 – MRP_Interval . 62
Table 34 – MRP_Transition . 62
Table 35 – MRP_TimeStamp . 63
Table 36 – MRP_Blocked . 63
Table 37 – MRP_DomainUUID . 63
Table 38 – MRP_InState . 64
Table 39 – MRP_LinkInfo . 64
Table 40 – MRP Local variables of MRM protocol machine . 66
Table 41 – MRM State machine . 67
Table 42 – MRP Local variables of MRC protocol machine . 77
Table 43 – MRC state machine . 77
Table 44 – MRP local variables of MRA protocol machine . 83
Table 45 – MRA state machine . 84
Table 46 – MRP functions and macros . 102
Table 47 – MRP FDB clear timer . 106
Table 48 – MRP topology change timer . 107
Table 49 – MRP Local variables of MIM protocol machine . 108
Table 50 – MIM State machine for LC-mode . 109
Table 51 – MIM State machine for RC-mode . 111
Table 52 – MRP Local variables of MIC protocol machine . 116
Table 53 – MIC State machine for LC-mode . 116
Table 54 – MIC State machine for RC-mode . 120
Table 55 – MRP Interconnection functions . 123
Table 56 – MRP Interconnection topology change timer . 127
Table 57 – MRP Interconnection link status poll timer . 128
Table 58 – MRP Network/Connection parameters . 128
Table 59 – MRP MRM parameters . 129
Table 60 – MRP MRC parameters . 130
Table 61 – MRP MIM parameters . 131
Table 62 – MRP MIC parameters . 131
Table A.1 – Compatible mode MRP_Option for MRP_Test Substitutions . 166
Table A.2 – Compatible mode MRP_Option frames MRP_TestMgrNAck and
MRP_TestPropagate Substitutions . 166
IEC 62439-2:2021 © IEC 2021 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
HIGH AVAILABILITY AUTOMATION NETWORKS –
Part 2: Media Redundancy Protocol (MRP)
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,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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
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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
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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.
IEC 62439-2 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 third edition cancels and replaces the second edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) improvements for the Continuity Check Protocol,
b) introduction of further specifiers for the rings, the interconnection links, and the device roles,
c) extensions and information on the use of baudrates smaller than 100 Mbit/s,
d) information on using MRP together with scheduling and shaping mechanisms,
e) introduction of an MRP Interconnection profile for a 30 ms reconfiguration time.
– 8 – IEC 62439-2:2021 © IEC 2021
The text of this International Standard is based on the following documents:
Draft Report on voting
65C/1118/FDIS 65C/1137/RVD
Full information on the voting for the approval of this International Standard 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/standardsdev/publications.
This International Standard is to be read in conjunction with IEC 62439-1.
A list of all parts of the IEC 62439 series, published under the general title Industrial
communication networks – High availability automation networks, can be found on the IEC
website.
This IEC standard includes Code Components i.e. components that are intended to be directly
processed by a computer. Such content is any text found between the markers
and , or otherwise is clearly labeled in this standard as a Code Component.
The purchase of this IEC standard carries a copyright license for the purchaser to sell software
containing Code Components from this standard directly to end users and to end users via
distributors, subject to IEC software licensing conditions, which can be found at:
http://www.iec.ch/CCv1.
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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
IEC 62439-2:2021 © IEC 2021 – 9 –
INTRODUCTION
The IEC 62439 series specifies relevant principles for high availability networks that meet the
requirements for industrial automation networks.
In the fault-free state of the network, the protocols of the IEC 62439 series provide
ISO/IEC/IEEE 8802-3 (IEEE Std 802.3™) compatible, reliable data communication, and
preserve determinism of real-time data communication. In cases of fault, removal, and insertion
of a component, they provide deterministic recovery times.
These protocols retain fully the typical Ethernet communication capabilities as used in the office
world, 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 diverse application requirements. These
solutions support different redundancy topologies and mechanisms which are introduced in
IEC 62439-1 and specified in the other Parts of the IEC 62439 series. IEC 62439-1 also
distinguishes between the different solutions, giving guidance to the user.
The IEC 62439 series follows the general structure and terms of the IEC 61158 series.
The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed
that compliance with this document may involve the use of a patent. IEC takes no position
concerning the evidence, validity, and scope of this patent right.
The holder of this patent right has assured IEC that s/he is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world.
In this respect, the statement of the holder of this patent right is registered with IEC. Information
may be obtained from the patent database available at http://patents.iec.ch.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those in the patent database. IEC shall not be held
responsible for identifying any or all such patent rights.
– 10 – IEC 62439-2:2021 © IEC 2021
INDUSTRIAL COMMUNICATION NETWORKS –
HIGH AVAILABILITY AUTOMATION NETWORKS –
Part 2: Media Redundancy Protocol (MRP)
1 Scope
1.1 General
The IEC 62439 series is applicable to high-availability automation networks based on the
ISO/IEC/IEEE 8802-3 (IEEE Std 802.3) (Ethernet) technology.
This part of the IEC 62439 series specifies a recovery protocol based on a ring topology,
designed to react deterministically on a single failure of an inter-switch link or switch in the
network, under the control of a dedicated media redundancy manager node.
1.2 Code component distribution
Each Code Component is a ZIP package containing at least the ele
...
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