EN 61850-9-2:2011

SLOVENSKI STANDARD
01-marec-2012
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Communication networks and systems for power utility automation - Part 9-2: Specific
communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3
Kommunikationsnetze und -systeme für die Automatisierung in der elektrischen
Energieversorgung - Teil 9-2: Spezifische Abbildung von Kommunikationsdiensten
(SCSM) - Abgetastete Werte über ISO/IEC 8802-3
Réseaux et systèmes de communication pour l'automatisation des systèmes électriques
- Partie 9-2: Mise en correspondance des services de communication spécifiques
(SCSM) - Valeurs échantillonnées sur l'ISO/CEI 8802-3
Ta slovenski standard je istoveten z: EN 61850-9-2:2011
ICS:
29.240.30 Krmilna oprema za Control equipment for electric
elektroenergetske sisteme power systems
33.200 Daljinsko krmiljenje, daljinske Telecontrol. Telemetering
meritve (telemetrija)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61850-9-2
NORME EUROPÉENNE
December 2011
EUROPÄISCHE NORM
ICS 33.200 Supersedes EN 61850-9-2:2004

English version
Communication networks and systems for power utility automation -
Part 9-2: Specific communication service mapping (SCSM) -
Sampled values over ISO/IEC 8802-3
(IEC 61850-9-2:2011)
Réseaux et systèmes de communication Kommunikationsnetze und -systeme für
pour l'automatisation des systèmes die Automatisierung in der elektrischen
électriques - Energieversorgung -
Partie 9-2: Mise en correspondance des Teil 9-2: Spezifische Abbildung von
services de communication spécifiques Kommunikationsdiensten (SCSM) -
(SCSM) - Abgetastete Werte über ISO/IEC 8802-3
Valeurs échantillonnées (IEC 61850-9-2:2011)
sur l'ISO/CEI 8802-3
(CEI 61850-9-2:2011)
This European Standard was approved by CENELEC on 2011-10-27. 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61850-9-2:2011 E
Foreword
The text of document 57/1133/FDIS, future edition 2 of IEC 61850-9-2, prepared by IEC/TC 57 "Power
systems management and associated information exchange" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN 61850-9-2:2011.

The following dates are fixed:
(dop) 2012-07-27
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2014-10-27
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61850-9-2:2004.
EN 61850-9-2:2004:
 addition of an optional Link redundancy layer (Tables 3 to 6);
 redefinition of “reserved” fields in link layer (5.3.3.4);
 evolution of USVCB and MSVCB components (Tables 9, 10, 12);
 evolution of encoding for the transmission of the sampled value buffer (Table 14).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 61850-9-2:2011 was approved by CENELEC as a European
Standard without any modification.

- 3 - EN 61850-9-2:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60874-10-1 - Connectors for optical fibres and cables - - -
Part 10-1: Detail specification for fibre optic
connector type BFOC/2,5 terminated to
multimode fibre type A1
IEC 60874-10-2 - Connectors for optical fibres and cables - - -
Part 10-2: Detail specification for fibre optic
connector type BFOC/2,5 terminated to
single-mode fibre type B1
IEC 60874-10-3 - Connectors for optical fibres and cables - - -
Part 10-3: Detail specification for fibre optic
adaptor type BFOC/2,5 for single and
multimode fibre
IEC/TR 61850-1 - Communication networks and systems in - -
substations -
Part 1: Introduction and overview

IEC/TS 61850-2 - Communication networks and systems in - -
substations -
Part 2: Glossary
IEC 61850-6 - Communication networks and systems for EN 61850-6 -
power utility automation -
Part 6: Configuration description language for
communication in electrical substations
related to IEDs
IEC 61850-7-1 - Communication networks and systems for EN 61850-7-1 -
power utility automation -
Part 7-1: Basic communication structure -
Principles and models
IEC 61850-7-2 - Communication networks and systems for EN 61850-7-2 -
power utility automation -
Part 7-2: Basic information and
communication structure - Abstract
communication service interface (ACSI)

IEC 61850-7-3 - Communication networks and systems for EN 61850-7-3 -
power utility automation -
Part 7-3: Basic communication structure -
Common data classes
IEC 61850-7-4 - Communication networks and systems for EN 61850-7-4 -
power utility automation -
Part 7-4: Basic communication structure -
Compatible logical node classes and data
object classes
Publication Year Title EN/HD Year

IEC 61850-8-1 - Communication networks and systems for EN 61850-8-1 -
power utility automation -
Part 8-1: Specific Communication Service
Mapping (SCSM) - Mappings to MMS
(ISO 9506-1 and ISO 9506-2) and to
ISO/IEC 8802-3
IEC/TS 62351-6 - Power systems management and associated - -
information exchange - Data and
communications security -
Part 6: Security for IEC 61850

IEC 62439-3 2010 Industrial communication networks - High EN 62439-3 2010
1) 1)
+ A1 201X availability automation networks - + A1 201X
Part 3: Parallel Redundancy Protocol (PRP)
and High availability Seamless Redundancy
(HSR)
ISO/IEC 7498-1 1994 Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
ISO/IEC 8326 1996 Information technology - Open systems - -
Interconnection - Session service definition

ISO/IEC 8327-1 1996 Information technology - Open Systems - -
Interconnection - Connection-oriented Session
protocol: Protocol specification

ISO/IEC 8649 1996 Information technology - Open systems - -
interconnection - Service definition for the
Association Control Service Element (ACSE)

ISO/IEC 8650-1 1996 Information technology - Open systems - -
interconnection - Connection-oriented protocol
for the association control service element:
Protocol specification
ISO/IEC 8802-3 2000 Information technology - Telecommunications - -
and information exchange between systems -
Local and metropolitan area networks -
Specific requirements -
Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access method
and physical layer specifications

ISO/IEC 8822 1994 Information technology - Open Systems - -
Interconnection - Presentation service
definition
ISO/IEC 8823-1 1994 Information technology - Open Systems - -
Interconnection -Connec tion-orien ted presen
ta tion pro tocol: Pro tocol speci fica tion

ISO/IEC 8824-1 2008 Information technology - Abstract Syntax - -
Notation One (ASN.1): Specification of basic
notation
ISO/IEC 8825-1 - Information technology - ASN.1 encoding - -
rules: Specification of Basic Encoding Rules
(BER), Canonical Encoding Rules (CER) and
Distinguished Encoding Rules (DER)

1)
To be published.
- 5 - EN 61850-9-2:2011
Publication Year Title EN/HD Year

ISO 9506-1 2003 Industrial automation systems - Manufacturing - -
Message Specification -
Part 1: Service definition
ISO 9506-2 2003 Industrial automation systems - - -
Manufacturing Message Specification -
Part 2: Protocol specification

IEEE 754 1985 Binary Floating-Point Arithmetic (R1990) - -

IEEE 802.1Q 1998 IEEE Standard for Local and Metropolitan - -
Area Networks: Virtual Bridged Local Area
Networks
IETF RFC 791 - Internet Protocol - DARPA Internet Program - -
Protocol Specification
IETF RFC 792 - Internet Control Message Protocol - -

IETF RFC 793 - Transmission Control Protocol - DARPA - -
Internet Program Protocol Specification

IETF RFC 826 - Ethernet Address Resolution Protocol - -

IETF RFC 894 - Standard for the Transmission of IP - -
Datagrams over Ethernet Networks

IETC RFC 919 - Broadcasting Internet Datagrams - -

IETF RFC 1006 - ISO transport services on top of TCP: - -
Version 3
IETF RFC 1112 - Host Extensions for IP Multicasting - -

IEC 61850-9-2 ®
Edition 2.0 2011-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Communication networks and systems for power utility automation –
Part 9-2: Specific communication service mapping (SCSM) – Sampled values
over ISO/IEC 8802-3
Réseaux et systèmes de communication pour l'automatisation des systèmes
électriques –
Partie 9-2: Mise en correspondance des services de communication spécifiques
(SCSM) – Valeurs échantillonnées sur ISO/CEI 8802-3

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 33.200 ISBN 978-2-88912-631-6

– 2 – 61850-9-2 © IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 9
4 Abbreviations . 9
5 Communication stack . 10
5.1 Overview of the protocol usage . 10
5.2 Client/server services and communication profiles . 11
5.2.1 Client/server services . 11
5.2.2 A-Profile . 12
5.2.3 TCP/IP T-Profile . 13
5.3 SV service and communication profile . 13
5.3.1 SV mapping overview . 13
5.3.2 A-Profile . 14
5.3.3 T-Profile . 14
5.4 Restrictions . 17
6 Mapping of IEC 61850-7-2 and IEC 61850-7-3 data attributes . 17
7 Mapping of IEC 61850-7-2 classes and services . 17
7.1 Classes of SV data sets . 17
7.2 Definition of SV data sets . 17
8 Mapping of the model for the transmission of sampled values . 18
8.1 Overview . 18
8.2 Mapping of the multicast sampled value control block class and services . 18
8.2.1 Multicast sampled value control block definition . 18
8.2.2 MSV Services . 19
8.3 Mapping of the unicast sampled value control block class and services . 20
8.3.1 Unicast sampled value control block definition . 20
8.3.2 USV Services . 21
8.4 Mapping of the update of the sampled value buffer. 21
8.5 Additional definitions for the transmission of sampled values . 21
8.5.1 Application layer functionality . 21
8.5.2 Presentation layer functionality . 22
8.6 Definitions for basic data types – Presentation layer functionality . 24
9 Conformance . 24
9.1 Notation . 24
9.2 PICS . 24
9.2.1 Profile conformance . 24
9.2.2 SV Services . 25
10 Substation configuration language (SCL) . 25
11 SCSM specific address element definitions . 26
Annex A (informative) ISO/IEC 8802-3 frame format and ASN.1 basic encoding rules . 27
Annex B (informative) Multicast address selection . 32

61850-9-2 © IEC:2011 – 3 –
Figure 1 – OSI reference model and profiles . 11
Figure 2 – Structure of the tag header . 15
Figure 3 – Reserved 1 . 16
Figure 4 – Concatenation of several ASDU's into one frame . 22
Figure A.1 – ISO/IEC 8802-3 frame format – No link redundancy . 27
Figure A.2 – ISO/IEC 8802-3 frame format – Link redundancy: HSR . 28
Figure A.3 – ISO/IEC 8802-3 frame format – Link redundancy: PRP . 29
Figure A.4 – Basic encoding rules format . 30
Figure A.5 – Format of the tag octets . 30
Figure A.6 – Example for an ASN.1 coded APDU frame structure . 31

Table 1 – Service requiring client/server communication profile . 12
Table 2 – Service and protocols for client/server communication A-Profile . 12
Table 3 – Service and protocols for peer TCP/IP T-Profile . 13
Table 4 – Service requiring SV communication profile . 13
Table 5 – Service and protocols for SV communication A-Profile . 14
Table 6 – SV T-Profile . 14
Table 7 – Default Virtual LAN IDs and priorities . 15
Table 8 – Assigned Ethertype values . 16
Table 9 – MMS TypeDescription definition for MSVCB MMS structure . 18
Table 10 – DstAddress structure . 19
Table 11 – Mapping of multicast sampled value services . 19
Table 12 – MMS TypeDescription definition for USVCB MMS structure . 20
Table 13 – Mapping of unicast sampled value services . 21
Table 14 – Encoding for the transmission of the sampled value buffer . 22
Table 15 – Encoding for the basic data types . 24
Table 16 – PICS for A-Profile support . 25
Table 17 – PICS for T-Profile support . 25
Table 18 – SV conformance statement . 25
Table 19 – Definitions for SV SCL . 26
Table B.1 – Recommended multicast addressing example . 32

– 4 – 61850-9-2 © IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMMUNICATION NETWORKS AND SYSTEMS
FOR POWER UTILITY AUTOMATION –

Part 9-2: Specific communication service mapping (SCSM) –
Sampled values over ISO/IEC 8802-3

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.
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.
International Standard IEC 61850-9-2 has been prepared by IEC technical committee 57:
Power systems management and associated information exchange.
The text of this standard is based on the following documents:
FDIS Report on voting
57/1133/FDIS 57/1161/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.

61850-9-2 © IEC:2011 – 5 –
This second edition cancels and replaces the first edition published in 2004 and constitutes a
technical revision.
Main changes with respect to the first edition are:
• addition of an optional Link redundancy layer (Tables 3 to 6);
• redefinition of “reserved” fields in link layer (5.3.3.4);
• evolution of USVCB and MSVCB components (Tables 9, 10, 12);
• evolution of encoding for the transmission of the sampled value buffer (Table 14).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61850 series, under the general title: Communication networks and
systems for power utility automation, 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.
– 6 – 61850-9-2 © IEC:2011
INTRODUCTION
This part of IEC 61850 defines the SCSM for sampled values over ISO/IEC 8802-3. The intent
of this SCSM definition is to include the complete mapping of the sampled value model.
This part of IEC 61850 applies to electronic current and voltage transformers (ECT and EVT
having a digital output), merging units, and intelligent electronic devices, for example protection
units, bay controllers and meters, or sensors.
Process bus communication structures can be arranged in different ways as described in
IEC/TR 61850-1. In addition to the transmission of sampled value data sets, which are directly
connected to ISO/IEC 8802-3, a selection of IEC 61850-8-1 services is necessary to support
the access to the SV control block. References to the relevant IEC 61850-8-1 services are
provided in this SCSM. For less complex devices (for example merging units), the sampled
value control block can be pre-configured, in which case there is no need to implement
IEC 61850-8-1 services based on the MMS-Stack.
This document defines the mapping of sampled value class model (IEC 61850-7-2) to
ISO/IEC 8802-3. This SCSM, in combination with IEC 61850-7 and IEC 61850-6, allows
interoperability between devices from different manufacturers.
This standard does not specify individual implementations or products, nor does it constrain the
implementation of entities and interfaces within a computer system. This standard specifies the
externally visible functionality of implementations together with conformance requirements for
such functionalities.
Reading guide:
• This document is an extended mapping specification of IEC 61850-8-1 to cover sampled
value transmission over ISO/IEC 8802-3.
• This document can best be understood if the reader is thoroughly familiar with
IEC 61850-7-1, IEC 61850-7-2, IEC 61850-7-3 and IEC 61850-7-4.
• The ACSI services defined in IEC 61850-7-2 are not explained in this part of IEC 61850.

61850-9-2 © IEC:2011 – 7 –
COMMUNICATION NETWORKS AND SYSTEMS
FOR POWER UTILITY AUTOMATION –

Part 9-2: Specific communication service mapping (SCSM) –
Sampled values over ISO/IEC 8802-3

1 Scope
This part of IEC 61850 defines the specific communication service mapping (SCSM) for the
transmission of sampled values according to the abstract specification in IEC 61850-7-2. The
mapping is that of the abstract model on a mixed stack using direct access to an
ISO/IEC 8802-3 link for the transmission of the samples in combination with IEC 61850-8-1.
Each SCSM consists of three parts:
– a specification of the communication stack being used,
– the mapping of the abstract specifications of IEC 61850-7 series on the real elements of the
stack being used, and
– the implementation specification of functionality, which is not covered by the stack being
used.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60874-10-1, Connectors for optical fibres and cables – Part 10-1: Detail specification for
fibre optic connector type BFOC/2,5 terminated to multimode fibre type A1 (withdrawn)
IEC 60874-10-2, Connectors for optical fibres and cables – Part 10-2: Detail specification for
fibre optic connector type BFOC/2,5 terminated to single-mode fibre type B1 (withdrawn)
IEC 60874-10-3, Connectors for optical fibres and cables – Part 10-3: Detail specification for
fibre optic adaptor type BFOC/2,5 for single and multimode fibre (withdrawn)
IEC/TR 61850-1, Communication networks and systems for power utility automation – Part 1:
Introduction and overview
IEC/TS 61850-2, Communication networks and systems for power utility automation – Part 2:
Glossary
IEC 61850-6, Communication networks and systems for power utility automation – Part 6:
Configuration description language for communication in electrical substations related to IEDs
IEC 61850-7-1, Communication networks and systems for power utility automation – Part 7-1:
Basic communication structure – Part 7-1: Principles and models
IEC 61850-7-2, Communication networks and systems for power utility automation – Part 7-2:
Basic information and communication structure – Abstract communication service interface
(ACSI)
– 8 – 61850-9-2 © IEC:2011
IEC 61850-7-3, Communication networks and systems for power utility automation – Part 7-3:
Basic communication structure – Common data classes
IEC 61850-7-4, Communication networks and systems for power utility automation – Part 7-4:
Basic communication structure – Compatible logical node classes and data object classes
IEC 61850-8-1, Communication networks and systems for power utility automation – Part 8-1:
Specific Communication Service Mapping (SCSM) – Mappings to MMS (ISO 9506-1 and
ISO 9506-2) and to ISO/IEC 8802-3
IEC/TS 62351-6, Power systems management and associated information exchange – Data
and communications security – Part 6: Security for IEC 61850
IEC 62439-3:2010, Industrial communication networks – High availability automation networks –
Part 3: Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR)
Amendment 1
ISO/IEC 7498-1:1994, Information technology – Open Systems Interconnection – Basic
Reference Model: The Basic Model
ISO/IEC 8326:1996, Information technology – Open Systems Interconnection – Session service
definition
ISO/IEC 8327-1:1996, Information technology – Open Systems Interconnection – Connection-
oriented session protocols: Protocol specification
ISO/IEC 8649:1996, Information technology – Open Systems Interconnection – Service
definition for the Associated Control Service Element
ISO/IEC 8650-1:1996, Information technology – Open Systems Interconnection – Connection-
oriented protocol for the Association Control Service Element: Protocol specification
ISO/IEC 8802-3:2000, Information technology – Telecommunications and information exchange
between systems – Local and metropolitan area networks – Specific requirements – Part 3:
Carrier sense multiple access with collision detection (CSMA/CD) access method and physical
layer specifications
ISO/IEC 8822:1994, Information technology – Open Systems Interconnection – Presentation
service definition
ISO/IEC 8823-1:1994, Information technology – Open Systems Interconnection – Connection-
oriented presentation protocol: Protocol specification
ISO/IEC 8824-1:2008, Information technology – Abstract Syntax Notation One (ASN. 1):
Specification of basic notation
ISO/IEC 8825-1, Information technology – ASN.1 encoding rules: Specification of Basic
Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules
(DER)
ISO 9506-1:2003, Industrial automation systems – Manufacturing Message Specification –
Part 1: Service definition
———————
To be published.
61850-9-2 © IEC:2011 – 9 –
ISO 9506-2:2003, Industrial automation systems – Manufacturing Message Specification –
Part 2: Protocol specification
IEEE 754:1985, IEEE Standard for Binary Floating-Point Arithmetic
IEEE 802.1Q:1998, IEEE Standards for Local and Metropolitan Area Networks: Virtual Bridged
Local Area Networks
RFC 791, Internet Protocol; IETF, available at http://www.ietf.org [cited on 2011-03-18]
RFC 792, Internet Control Message Protocol; IETF, available at http://www.ietf.org [cited on
2011-03-18]
RFC 793, Transmission Control Procedure; IETF, available at http://www.ietf.org [cited on
2011-03-18]
RFC 826, Ethernet Address Resolution Protocol or Converting Network Protocol Addresses to
48.bit Ethernet Address for Transmission on Ethernet Hardware; IETF, available at
http://www.ietf.org [cited on 2011-03-18]
RFC 894, A Standard for the Transmission of IP Datagrams over Ethernet Networks; IETF,
available at http://www.ietf.org [cited on 2011-03-18]
RFC 919, Broadcasting Internet Datagrams; IETF, available at http://www.ietf.org [cited on
2011-03-18]
RFC 1006 ISO transport services on top of TCP: Version 3; IETF, available at
http://www.ietf.org [cited on 2011-03-18]
RFC 1112, Host Extensions for IP multicasting; IETF, available at http://www.ietf.org [cited on
2011-03-18]
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC/TS 61850-2 apply.
4 Abbreviations
Abstract communication service interface
ACSI
Application service data unit
ASDU
Abstract syntax notation number one
ASN.1
Application protocol control information
APCI
Application protocol data unit
APDU
Application identifier
APPID
Attachment unit interface
AUI
BER ASN.1 basic encoding rules
Bitstring
BS
c Conditional support. The item shall be implemented if the stated condition exists
CFI Canonical format identifier

– 10 – 61850-9-2 © IEC:2011
Carrier sense multiple access/collision detection
CSMA/CD
Data frame
DF
Data object
DO
Electronic current transformer
ECT
Electronic voltage transformer
EVT
Functional standard
F/S
Generic object oriented substation event
GOOSE
Generic substation status event
GSSE
i Out-of-scope: The implementation of the item is not within the scope of this
standard
ICD IED configuration description
Intelligent electronic device
IED
Link layer service data unit
LSDU
m Mandatory support. The item shall be implemented
Media access control
MAC
Medium attachment unit
MAU
Manufacturing message specification (ISO 9506)
MMS
Multicast sampled value control block
MSVCB
Merging unit
MU
o Optional support. The implementor may decide to implement the item
Protocol data unit
PDU
Protocol implementation conformance statement
PICS
Specific communication services mapping
SCSM
r readable
Sampled value
SV
Tag control information
TCI
Tag protocol identifier
TPID
Unicast sampled value control block
USVCB
VID VLAN identifier
VLAN Virtual local area network
VMD Virtual manufacturing device
w Writeable
Excluded: The implementor shall not implement this item
x
XML Extensible markup language
5 Communication stack
5.1 Overview of the protocol usage
The OSI reference model (ISO/IEC 7498-1) defines a model based upon the concept of
layering of communication functions. The model includes 7 layers and specifies the functional
requirements for each layer to achieve a robust communication system. The model does not

61850-9-2 © IEC:2011 – 11 –
specify the protocols to be used to achieve the functionality, nor does it restrict the solution to a
single set of protocols.
Application
Presentation A-Profile
Session
Transport
Network
T-Profile
DataLink
Physical
IEC  1786/11
Figure 1 – OSI reference model and profiles
The use of ISO application (A-Profile) and transport (T-Profile) profiles (see Figure 1)
describes the various stack profiles. An ISO A-Profile is the set of specifications and
agreements relating to the upper three (3) layers of the ISO OSI reference model (for example
the application, presentation, and session layers). An ISO T-Profile is the set of specifications
and agreements relating to the lower four (4) layers of the ISO OSI reference model (for
example the transport, network, datalink and physical layers).
Two combinations of A-Profiles and T-Profiles are defined in order to support the transmission
of sampled values including the access to the associated SV control block, as specified in
IEC 61850-7-2. The two different combinations are used for:
• client/server services based on MMS in accordance to IEC 61850-8-1;
• SV services based on datalink layer.
5.2 Client/server services and communication profiles
5.2.1 Client/server services
This client/server communication profile shall be used in addition to the SV communication
profile according to 5.3 if an access to the sampled value control block via client is required.
This profile shall be used for any implementation claiming conformance to this standard and
declaring support for one of the following IEC 61850-7-2 services in Table 1.

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Table 1 – Service requiring client/server communication profile
IEC 61850-7-2 model IEC 61850-7-2 service
Server GetServerDirectory
Association Associate
Abort
Release
Logical device GetLogicalDeviceDirectory
Logical node GetLogicalNodeDirectory
GetAllDataValues
Data GetDataValues
SetDataValues
GetDataDirectory
GetDataDefinition
Data set GetDataSetValues
SetDataSetValues
CreateDataSet
DeleteDataSet
GetDataSetDirectory
SV class model GetMSVCBValues
SetMSVCBValues
GetUSVCBValues
SetUSVCBValues
5.2.2 A-Profile
Table 2 shows services and protocols of the A-Profile client/server.
Table 2 – Service and protocols for client/server communication A-Profile
Specification
OSI model layer m/o
Protocol
Name Service specification
specification
Application Manufacturing ISO 9506-1:2000 ISO 9506-2:2000 m
message
specification
Association control ISO/IEC 8649:1996 ISO/IEC 8650-1:1996 m
service element
Presentation Connection oriented ISO/IEC 8822:1994 ISO/IEC 8823-1:1994 m
presentation
Abstract syntax ISO/IEC 8824-1:2008 ISO/IEC 8825-1 m
Session Connection oriented ISO/IEC 8326:1996 ISO/IEC 8327-1:1996 m
session
There is only one T-Profile (TCP/IP) that may be used by the client/server A-Profile.

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5.2.3 TCP/IP T-Profile
Table 3 shows services and protocols of the TCP/IP T-Profile client/server.
Table 3 – Service and protocols for peer TCP/IP T-Profile
Specification
OSI model
m/o
Service Protocol
layer
Name
specification specification
Transport ISO transport on top of TCP RFC 1006 m
Internet control message protocol (ICMP) RFC 792 m
Transmission control protocol (TCP) RFC 793 m
Network Internet protocol RFC 791
Converting network protocol address RFC 826 (Address resolution m
protocol: ARP)
Broadcasting internet datagrams RFC 919 m
Host extensions for IP multicasting RFC 1112 m
Link Parallel redundancy protocol and high IEC 62439-3, Amendment 1 o
Redundancy availability seamless ring
DataLink Standard for the transmission of IP datagrams RFC 894 m
over Ethernet networks
Carrier sense multiple access with collision ISO/IEC 8802-3:2000 m
detection (CSMA/CD)
Physical Fibre optic transmission system 100Base-FX ISO/IEC 8802-3:2000 c1
Basic optical fibre connector IEC 60874-10-1, IEC 60874-10-2 c1
and IEC 60874-10-3
NOTE This is the specification for the ST
connector.
c1 – Recommended, but future technology could be used.

5.3 SV service and communication profile
5.3.1 SV mapping overview
This SV communication profile shall be used for any implementation claiming conformance to
this standard and declaring support for one of the following IEC 61850-7-2 services in Table 4.
Table 4 – Service requiring SV communication profile
Model IEC 61850-7-2 service
Multicast sampled value class model Multicast SV message
Unicast sampled value class model Unicast SV message

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5.3.2 A-Profile
Table 5 shows services and protocols of the A-Profile SV.
Table 5 – Service and protocols for SV communication A-Profile
OSI model Specification m/o
layer
Name Service specification Protocol specification
Application m
SV service
Presentation Abstract syntax ISO/IEC 8824-1:2008 ISO/IEC 8825-1 m
Session
Presentation layer: see additional definitions in 8.5.
Application layer: see additional definitions in 8.5.
5.3.3 T-Profile
The T-Profile for SV services is shown in Table 6.
Table 6 – SV T-Profile
Specification
OSI model
m/o
Name Service specification Protocol
layer
specification
Transport
Network
Link Parallel redundancy protocol and IEC 62439-3, Amendment 1 o
Redundancy high availability seamless ring
DataLink IEEE 802.1Q m
Priority tagging/VLAN
Carrier sense multiple access ISO/IEC 8802-3:2000 m
with collision detection
(CSMA/CD)
Physical Fibre optic transmission system ISO/IEC 8802-3:2000 c1
100Base-FX
Basic optical fibre connector IEC 60874-10-1, IEC 60874-10-2 and c1
IEC 60874-10-3
NOTE This is the specification
for the ST connector.
c1 – Recommended, but future technology could be used.

5.3.3.1 Physical layer: Specifications for the medium attachment unit (MAU)
The optical fibre transmission system 100Base-FX according to ISO/IEC 8802-3 is
recommended as indicated above because of requirements relating to the electromagnetic
environment.
5.3.3.2 Link layer: Ethernet addresses
The destination ISO/IEC 8802-3 multicast/unicast address has to be configured for the
transmission of sampled values. A unique ISO/IEC 8802-3 source address shall be used.
Recommendations of multicast address range assignments are given in Annex B.

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5.3.3.3 Link layer: Priority tagging/virtual LAN
Priority tagging according to IEEE 802.1Q is used to separate time critical and high priority bus
traffic for protection-relevant applications from low priority busload.
See Figure 2 for the structure of the tag header.
Octets 8 7 6 5 4 3 2 1
TPID
0 × 8100 (as per 802.1Q)
2 User priority CFI VID
TCI
3 VID
IEC  1787/11
Figure 2 – Structure of the tag header
TPID (tag protocol identifier) field: Indicates the Ethernet type assigned for 802.1Q Ethernet
encoded frames. This value shall be 0x8100.
TC
...