EN IEC 62439-3:2018

SLOVENSKI STANDARD
01-junij-2018
1DGRPHãþD
SIST EN 62439-3:2012
Industrijska komunikacijska omrežja za avtomatizacijo z visoko razpoložljivostjo -
3. del: Protokol vzporedne redundance (PRP) in brezprehodna zanka z visoko
razpoložljivostjo (HSR) (IEC 62439-3:2016)
Industrial communication networks - High availability automation networks - Part 3:
Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR)
(IEC 62439-3:2016)
Industrielle Kommunikationsnetze - Hochverfügbare Automatisierungsnetze - Teil 3:
Parallelredundanz-Protokoll (PRP) und nahtloser Hochverfügbarkeits-Ring (HSR) (IEC
62439-3:2016)
Réseaux industriels de communication - Réseaux d’automatisme à haute disponibilité -
Partie 3 : Protocole de redondance parallèle (PRP) et redondance transparente de haute
disponibilité (HSR) (IEC 62439-3:2016)
Ta slovenski standard je istoveten z: EN IEC 62439-3:2018
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 62439-3

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2018
ICS 25.040; 35.040 Supersedes EN 62439-3:2012
English Version
Industrial communication networks - High availability automation
networks - Part 3: Parallel Redundancy Protocol (PRP) and
High-availability Seamless Redundancy (HSR)
(IEC 62439-3:2016)
Réseaux industriels de communication - Réseaux Industrielle Kommunikationsnetze - Hochverfügbare
d'automatisme à haute disponibilité - Partie 3 : Protocole de Automatisierungsnetze - Teil 3: Parallelredundanz-Protokoll
redondance parallèle (PRP) et redondance transparente de (PRP) und nahtloser Hochverfügbarkeits-Ring (HSR)
haute disponibilité (HSR) (IEC 62439-3:2016)
(IEC 62439-3:2016)
This European Standard was approved by CENELEC on 2016-05-05. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62439-3:2017 E
European foreword
The text of document 65C/834/FDIS, future edition 3 of IEC 62439-3, prepared by IEC Subcommittee
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-
3:2018.
The following dates are fixed:
• latest date by which the document has to be (dop) 2018-08-02
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2021-02-02
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 62439-3:2012.

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.

Endorsement notice
The text of the International Standard IEC 62439-3:2016 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 61850 (all parts) NOTE Harmonized as EN 61850 (all parts).
IEC 61850-8-1 NOTE Harmonized as EN 61850-8-1 (not modified).
IEC 61850-9-2 NOTE Harmonized as EN 61850-9-2 (not modified).
IEC 62439-6 NOTE Harmonized as EN 62439-6 (not modified).
IEC 62439-7 NOTE Harmonized as EN 62439-7 (not modified).
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 60050-191 -  International Electrotechnical Vocabulary - - -
Chapter 191: Dependability and quality of
service
IEC 61588 2009 Precision clock synchronization protocol for - -
networked measurement and control systems
IEC 62439-1 -  Industrial communication networks - High EN 62439-1 -
availability automation networks -- Part 1:
General concepts and calculation methods
IEC TR 61850-90-4 2013 Communication networks and systems for - -
power utility automation - Part 90-4: Network
engineering guidelines
ISO/IEC/IEEE 8802-3 2014 Standard for Ethernet - -
IEC/IEEE 61850-9-3 -  Communication networks and systems for - -
power utility automation - Part 9-3: Precision
time protocol profile for power utility automation
IEEE 802.1D 2004 IEEE Standard for local and metropolitan area - -
networks - Media Access Control (MAC)
Bridges
IEEE 802.1Q 2014 IEEE Standard for Local and metropolitan area - -
networks - Bridges and Bridged Networks
IETF RFC 2578 -  Structure of Management Information Version - -
2 (SMIv2), April 1999,
http://tools.ietf.org/html/rfc2578
IETF RFC 3418 -  Management Information Base (MIB) for the - -
Simple Network Management Protocol (SNMP)

IEC 62439-3 ®
Edition 3.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – High availability automation networks –

Part 3: Parallel Redundancy Protocol (PRP) and High-availability Seamless

Redundancy (HSR)
Réseaux de communication industriels – Réseaux d'automatisme à haute

disponibilité –
Partie 3: Protocole de redondance en parallèle (PRP) et redondance transparente

de haute disponibilité (HSR)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040, 35.040 ISBN 978-2-8322-3150-0

– 2 – IEC 62439-3:2016  IEC 2016
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
0.1 General . 10
0.2 Changes with respect to the previous edition . 10
0.3 Patent declaration . 10
1 Scope . 12
2 Normative references. 12
3 Terms, definitions, abbreviations, acronyms, and conventions . 13
3.1 Terms and definitions . 13
3.2 Abbreviations and acronyms . 13
3.3 Conventions . 14
4 Parallel Redundancy Protocol (PRP) . 15
4.1 PRP principle of operation . 15
4.1.1 PRP network topology . 15
4.1.2 PRP LANs with linear or bus topology . 15
4.1.3 PRP LANs with ring topology . 16
4.1.4 DANP node structure . 16
4.1.5 PRP attachment of singly attached nodes . 17
4.1.6 Compatibility between singly and doubly attached nodes . 18
4.1.7 Network management . 18
4.1.8 Implication on application . 18
4.1.9 Transition to non-redundant networks . 18
4.1.10 Duplicate handling . 19
4.1.11 Network supervision . 24
4.1.12 Redundancy management interface . 24
4.2 PRP protocol specifications . 24
4.2.1 Installation, configuration and repair guidelines . 24
4.2.2 Unicast MAC addresses . 25
4.2.3 Multicast MAC addresses . 25
4.2.4 IP addresses . 25
4.2.5 Nodes . 25
4.2.6 Duplicate Accept mode (testing only) . 26
4.2.7 Duplicate Discard mode . 26
4.3 PRP_Supervision frame . 30
4.3.1 PRP_Supervision frame format . 30
4.3.2 PRP_Supervision frame contents . 31
4.3.3 PRP_Supervision frame for RedBox . 32
4.3.4 Reception of a PRP_Supervision frame and NodesTable . 32
4.4 Bridging node . 33
4.5 Constants . 33
4.6 PRP service specification . 33
5 High-availability Seamless Redundancy (HSR) . 33
5.1 HSR objectives . 33
5.2 HSR principle of operation . 34
5.2.1 Basic operation with a ring topology . 34
5.2.2 DANH node structure . 35

IEC 62439-3:2016  IEC 2016 – 3 –
5.2.3 Topology . 36
5.2.4 RedBox structure . 44
5.3 HSR node specifications . 46
5.3.1 HSR operation . 46
5.3.2 DANH receiving from its link layer interface . 46
5.3.3 DANH receiving from an HSR port . 47
5.3.4 DANH forwarding rules . 48
5.3.5 CoS . 49
5.3.6 Clock synchronization . 50
5.3.7 Deterministic medium access . 50
5.4 HSR RedBox specifications . 50
5.4.1 RedBox properties . 50
5.4.2 RedBox receiving from interlink . 50
5.4.3 RedBox forwarding on the ring . 52
5.4.4 RedBox receiving from an HSR port . 52
5.4.5 RedBox receiving from its link layer interface . 54
5.4.6 Redbox ProxyNodeTable handling . 54
5.4.7 RedBox CoS . 54
5.4.8 RedBox clock synchronization . 55
5.4.9 RedBox medium access . 55
5.5 QuadBox specification . 55
5.6 Duplicate Discard method . 55
5.7 Frame format for HSR . 55
5.7.1 Frame format for all frames . 55
5.7.2 HSR_Supervision frame . 56
5.8 Constants . 59
5.9 HSR service specification . 60
6 Protocol Implementation Conformance Statement (PICS) . 61
7 PRP/HSR Management Information Base (MIB) . 62
Annex A (normative) Clocks synchronization over redundant paths in IEC 62439-3 . 79
A.1 Overview. 79
A.2 Attachment to redundant LANs by a boundary clock . 79
A.3 Attachment to redundant LANs by doubly attached ordinary clocks . 80
A.4 PRP mapping to PTP . 82
A.4.1 Scenarios and device roles . 82
A.4.2 Operation in PRP . 84
A.4.3 Configuration specification . 85
A.4.4 Specifications of DANP as DAC . 86
A.4.5 Clock model of a RedBox for PTP . 86
A.5 HSR Mapping to PTP . 103
A.5.1 PTP traffic in HSR . 103
A.5.2 HSR nodes specifications . 106
A.5.3 Redundant clocks in HSR . 107
A.5.4 Attachment of an MC to an external LAN . 107
A.6 PRP to HSR Mapping . 108
A.6.1 Connection methods . 108
A.6.2 PRP-HSR connection by BC . 108
A.6.3 PRP-HSR connection by TCs . 109

– 4 – IEC 62439-3:2016  IEC 2016
A.7 Doubly attached clock model . 110
A.7.1 State machine . 110
A.7.2 Supervision of the port . 113
A.7.3 BMCA for paired ports . 114
A.7.4 Selection of the port state . 115
A.8 PTP datasets for high availability . 115
A.8.1 General . 115
A.8.2 Data types . 115
A.8.3 Datasets for ordinary or boundary clocks . 116
A.8.4 Object for transparent clocks . 120
Annex B (normative) PTP profile for Power Utility Automation – Redundant clock
attachment . 123
B.1 Application domain . 123
B.2 PTP profile specification . 123
B.3 Redundant clock attachment. 123
Annex C (normative) PTP profiles for high-availability automation networks . 124
C.1 Application domain . 124
C.2 PTP profile specification . 124
C.3 Clock types . 124
C.4 Protocol specification common . 125
C.5 Protocol specification for L3E2E automation profile . 125
C.6 Protocol specification for L2P2P automation profile . 125
C.7 Timing requirements . 126
C.7.1 Measurement conditions . 126
C.7.2 Network time inaccuracy . 126
C.7.3 Network elements . 126
C.7.4 Requirements for grandmasters . 126
C.7.5 Requirements for TCs . 127
C.7.6 Requirements for BCs . 127
C.7.7 Requirements for media converters . 127
C.7.8 Requirements for links . 127
C.8 Network engineering . 128
C.9 Default settings . 128
C.10 Redundant clock handling . 129
C.11 Protocol Implementation Conformance Statement (PICS) . 130
C.11.1 Conventions . 130
C.11.2 PICS . 130
Annex D (informative) Precision Time Protocol tutorial for IEC 62439-3 . 132
D.1 Objective . 132
D.2 Precision and accuracy . 132
D.3 PTP clock types . 133
D.4 PTP main options . 134
D.5 Layer 2 and layer 3 communication. 135
D.6 1-step and 2-step correction . 135
D.6.1 Time correction in TCs . 135
D.6.2 2-step to 1-step translation . 136
D.7 End-To-End link delay measurement . 138
D.7.1 General method . 138
D.7.2 End-to-End link delay measurement with 1-step clock correction . 138

IEC 62439-3:2016  IEC 2016 – 5 –
D.7.3 End-to-End link delay measurement with 2-step clock correction . 139
D.7.4 End-to-End link delay calculation by Delay_Req/Delay_Resp . 140
D.8 Peer-to-Peer link delay calculation . 140
D.8.1 Peer-to-Peer link delay calculation with 1-step correction . 140
D.8.2 Peer-to-Peer link delay calculation with 2-step correction . 141
Annex E (normative) Management Information base for singly and doubly attached
clocks . 143
Bibliography . 168

Figure 1 – PRP example of general redundant network . 15
Figure 2 – PRP example of redundant network as two LANs (bus topology) . 16
Figure 3 – PRP example of redundant ring with SANs and DANPs . 16
Figure 4 – PRP with two DANPs communicating . 17
Figure 5 – PRP RedBox, transition from single to double LAN . 19
Figure 6 – PRP frame extended by an RCT . 20
Figure 7 – PRP VLAN-tagged frame extended by an RCT . 21
Figure 8 – PRP padded frame closed by an RCT . 21
Figure 9 – Duplicate Discard algorithm boundaries . 22
Figure 10 – HSR example of ring configuration for multicast traffic . 34
Figure 11 – HSR example of ring configuration for unicast traffic . 35
Figure 12 – HSR structure of a DANH . 36
Figure 13 – HSR example of topology using two independent networks . 37
Figure 14 – HSR example of peer coupling of two rings . 38
Figure 15 – HSR example of connected rings . 39
Figure 16 – HSR example of coupling two redundant PRP LANs to a ring . 40
Figure 17 – HSR example of coupling from a ring node to redundant PRP LANs . 41
Figure 18 – HSR example of coupling from a ring to two PRP LANs . 42
Figure 19 – HSR example of coupling three rings to one PRP LAN. 43
Figure 20 – HSR example of meshed topology . 44
Figure 21 – HSR structure of a RedBox . 45
Figure 22 – HSR frame without a VLAN tag . 55
Figure 23 – HSR frame with VLAN tag . 56
Figure 24 – HSR node with management counters . 60
Figure 25 – HSR RedBox with management counters . 61
Figure A.1 – Doubly Attached Clock as BC (MCA is best master) . 79
Figure A.2 – Doubly Attached Clock when MCA is best master . 81
Figure A.3 – Doubly attached clocks when OC1 is best master . 82
Figure A.4 – Elements of PRP networks . 84
Figure A.5 – Connection of a master clock to an ordinary clock over PRP . 85
Figure A.6 – PRP RedBox as BCs (OC3 and BC7 are best masters) . 87
Figure A.7 – RedBox DABC clock model . 88
Figure A.8 – PRP RedBoxes as DABC with E2E – BC7 is master . 89
Figure A.9 – PRP RedBoxes as DABC with E2E – timing . 90

– 6 – IEC 62439-3:2016  IEC 2016
Figure A.10 – PRP RedBoxes as DABC with P2P – OC5 is best master . 91
Figure A.11 – PRP RedBoxes as DABC with P2P – timing . 92
Figure A.12 – PRP RedBox as DATC with E2E –signal flow . 93
Figure A.13 – PRP RedBox as DATC with E2E – timing . 95
Figure A.14 – PRP RedBox as DATC with P2P . 96
Figure A.15 – PRP RedBox as DATC with P2P – timing . 97
Figure A.16 – PRP RedBox as SLTC with E2E . 100
Figure A.17 – PRP RedBox as SLTC with E2E – timing . 101
Figure A.18 – PRP RedBox as SLTC with P2P . 102
Figure A.19 – HSR with one GMC . 104
Figure A.20 – PTP messages sent and received by an HSR node (1-step). . 105
Figure A.21 – PTP messages sent and received by an HSR node (2-step) . 106
Figure A.22 – Attachment of a GMC to an HSR ring through a RedBox as TC . 108
Figure A.23 – PRP to HSR coupling by BCs . 109
Figure A.24 – PRP to HSR coupling by TCs . 110
Figure A.25 – Port states including transitions for redundant operation . 111
Figure A.26 – BMCA for redundant masters . 114
Figure D.1 –Precision and accuracy example . 132
Figure D.2 – Precision Time Protocol principle . 133
Figure D.3 – Precision Time Protocol elements . 134
Figure D.4 – Delays and time-stamping logic in TCs . 135
Figure D.5 – Correction of the Sync message by 1-step and 2-step (peer-to-peer) . 136
Figure D.6 – Translation from 2-step to 1-step in TCs . 137
Figure D.7 – Translation from 2-step to 1-step – message view . 138
Figure D.8 – End-to-end link delay measurement with 1-step clock correction . 139
Figure D.9 – End-to-end delay measurement with 2-step clock correction . 140
Figure D.10 – Peer-to-peer link delay measurement with 1-step clock correction . 141
Figure D.11 – Peer-to-peer link delay measurement with 2-step clock correction . 142

Table 1 – Duplicate discard cases . 23
Table 2 – Monitoring data set . 26
Table 3 – NodesTable attributes . 27
Table 4 – PRP_Supervision frame with no VLAN tag . 30
Table 5 – PRP_Supervision frame with (optional) VLAN tag . 31
Table 6 – PRP_Supervision frame contents . 32
Table 7 – PRP_Supervision TLV for Redbox . 32
Table 8 – PRP constants . 33
Table 9 – HSR_Supervision frame with no VLAN tag . 57
Table 10 – HSR_Supervision frame with optional VLAN tag . 58
Table 11 – HSR Constants . 60
Table A.1 – States . 112
Table A.2 – Transitions . 113
Table A.3 – Variables. 113

IEC 62439-3:2016  IEC 2016 – 7 –
Table C.1 – PTP attributes for the Industrial Automation profile . 129
Table C.2 – PICS for clocks . 131

– 8 – IEC 62439-3:2016  IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
HIGH AVAILABILITY AUTOMATION NETWORKS –

Part 3: Parallel Redundancy Protocol (PRP) and
High-availability Seamless Redundancy (HSR)

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.
International Standard IEC 62439-3 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This third edition cancels and replaces the second edition published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) technical corrections and extension of specifications;
b) consideration of IEC 61588 clock synchronization with end-to-end delay measurement
alongside the existing peer-to-peer delay measurement in PRP.

IEC 62439-3:2016  IEC 2016 – 9 –
The text of this standard is based on the following documents:
FDIS Report on voting
65C/834/FDIS 65C/841/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This International Standard is to be read in conjunction with IEC 62439-1.
A list of all parts in the IEC 62439 series, published under the general title Industrial
communication networks – High availability automation networks, can be found on the IEC
website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication 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 publication using a
colour printer.
– 10 – IEC 62439-3:2016  IEC 2016
INTRODUCTION
0.1 General
IEC 62439-3 belongs to the IEC 62439 series “Industrial communication networks – High
availability automation networks”. It specifies the PRP and HSR seamless redundancy
protocols. It was adopted by IEC TC57 WG10 as the redundancy method for demanding
substation automation networks operating on layer 2 networks, according to IEC 61850-8-1
and IEC 61850-9-2.
The seamless redundancy principle has been extended to clocks operating according to the
Precision Time Protocol (IEC 61588) and attached to redundant networks. Two variants are
specified: L3E2E for clocks which operate on layer 3 networks with end-to-end link delay
measurement (E2E) and L2P2P for clocks that operate on layer 2 with peer-to-peer link delay
measurement (P2P).
0.2 Changes with respect to the previous edition
The major changes with respect to IEC 62439-3:2012 are:
– Subclause 4.1.10.3 has been rewritten to explain the calculation of the duplicate rejection
for different speeds.
– Annex A has been redrafted as a general concept for doubly attached clocks applicable to
end-to-end (E2E) and to peer-to-peer (P2P) link delay measurement; the principle of
paired port operation has now been specified in terms of a state machine based on
IEC 61588:2009.
– Annex B of IEC 62439-3:2012 has been deleted; its properties are mentioned in 5.3.7.
– Annex B (new) makes the support of redundancy mandatory for IEC/IEEE 61850-9-3 that
specifies doubly attached clocks on layer 2, with peer-to-peer delay measurement.
– Annex C specifies two profiles of a precision clock for industrial automation:
L3E2E for layer 3, end-to-end delay measurement and
L2P2P for layer 2, peer-to-peer delay measurement.
– Annex D contains the tutorial information on IEC 61588:2009 for understanding the above
annexes. It was contained in IEC 62439-3:2012 Annex A.
– Annex E (MIB) contains the SNMP Management Information Base to be used for singly
and doubly attached clocks in all profiles.
0.3 Patent declaration
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 concerning
filtering of redundant frames in a network node (Siemens Aktiengesellschaft – EP 2127329,
US 8184650, CN 101611615B) given in 5.2.3.3.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she 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:
Siemens Aktiengesellschaft
Oto-Hahn-Ring 6
81379 Munich, Germany
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of patents concerning

IEC 62439-3:2016  IEC 2016 – 11 –
Reception of redundant and non-redundant frames (ABB Research Ltd – EP 1825657,
US 8582426, CN 101057483, IN 254425) given in 4.2.7, concerning Identifying improper
cabling of devices (ABB Technology AG – EP 2163024, US 8344736, CN 101689985) given in
4.3, concerning Critical device with increased availability (ABB Research Ltd – EP 2090950)
given in 4.4, concerning Ring coupling nodes for high availability networks (ABB Research Ltd
– US 8582424, EP 2327185, CN 102106121) given in 5.2.3.
IEC takes no position concerning the evidence, validity and scope of these patent rights.
The holder of these patent rights has assured the IEC that he/she 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 these patent rights is
registered with IEC. Information may be obtained from:
ABB Schweiz AG
Intellectual Property CH-IP (CH-150016-L)
Brown Boveri Strasse 6
CH-5400 Baden, Switzerland
ch-ip.patent@abb.com
Attention is drawn to the possibility that some of
...