EN 61850-9-2:2004

SLOVENSKI STANDARD
01-november-2005
.RPXQLNDFLMVNDRPUHåMDLQVLVWHPLYSRVWDMDK±GHO3UHVOLNDYHSRVHEQH
NRPXQLNDFLMVNHVWRULWYH6&60±9]RUþQHRGþLWDQHYUHGQRVWLSR,62,(&
,(&
Communication networks and systems in substations -- Part 9-2: Specific
Communication Service Mapping (SCSM) - Sampled values over ISO/IEC 8802-3
Kommunikationsnetze und -systeme in Stationen -- Teil 9-2: Spezifische Abbildung von
Kommunikationsdiensten (SCSM) - Abgetastete Werte über ISO/IEC 8802-3
Réseaux et systèmes de communication dans les postes -- Partie 9-2: Implémentation
spécifique des services de communication (SCSM) - Valeurs numérisées sur l'ISO/IEC
8802-3
Ta slovenski standard je istoveten z: EN 61850-9-2:2004
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
EUROPÄISCHE NORM May 2004
ICS 33.200
English version
Communication networks and systems in substations
Part 9-2: Specific Communication Service Mapping (SCSM) –
Sampled values over ISO/IEC 8802-3
(IEC 61850-9-2:2004)
Réseaux et systèmes de communication Kommunikationsnetze und
dans les postes -systeme in Stationen
Partie 9-1: Implémentation spécifique Teil 9-2: Spezifische Abbildung von
des services de communication (SCSM) - Kommunikationsdiensten (SCSM) -
Valeurs numérisées sur l'ISO 8802-3 Abgetastete Werte über ISO/IEC 8802-3
(CEI 61850-9-2:2004) (IEC 61850-9-2:2004)

This European Standard was approved by CENELEC on 2004-04-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61850-9-2:2004 E
Foreword
The text of document 57/690/FDIS, future edition 1 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 was approved by CENELEC as EN 61850-9-2 on 2004-04-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2005-01-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-04-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61850-9-2:2004 was approved by CENELEC as a
European Standard without any modification.
__________
- 3 - EN 61850-9-2:2004
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
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

1)
IEC 60874-10-2 - Part 10-2: Detail specification for fibre - -
optic connector type BFOC/2,5
terminated to single-mode fibre type B1

1)
IEC 60874-10-3 - Part 10-3: Detail specification for fibre - -
optic adaptor type BFOC/2,5 for single
and multimode fibre
1)
2)
IEC 61850-7-1 - Communication networks and systems in EN 61850-7-1 2003
substations
Part 7-1: Basic communication structure
for substation and feeder equipment -
Principles and models
1) 2)
IEC 61850-7-2 - Part 7-2: Basic communication structure EN 61850-7-2 2003
for substation and feeder equipment -
Abstract communication service interface
(ACSI)
1) 2)
IEC 61850-7-3 - Part 7-3: Basic communication structure EN 61850-7-3 2003
for substation and feeder equipment -
Common data classes
1) 2)
IEC 61850-7-4 - Part 7-4: Basic communication structure EN 61850-7-4 2003
for substation and feeder equipment -
Compatible logical node classes and data
classes
1)
3)
IEC 61850-8-1 - Part 8-1: Specific communication service EN 61850-8-1 -
mapping (SCSM) - Mapping to MMS
(ISO/IEC 9506 Part 1 and Part 2) over
ISO 8802-3
1)
Undated reference.
2)
Valid edition at date of issue.
3)
In preparation.
Publication Year Title EN/HD Year
1) 2)
IEC 61850-9-1 - Part 9-1: Specific Communication Service EN 61850-9-1 2003
Mapping (SCSM) - Sampled values over
serial unidirectional multidrop point to
point link
EN ISO/IEC 7498-1
ISO/IEC 7498-1 1994 Information technology - Open systems 1995
interconnection - Basic reference model
Part 1: The basic model
ISO/IEC 8326 1996 Information technology - Open systems - -
Interconnection - Session service
definition
ISO/IEC 8327-1 1997 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/TR2 1996 Information technology - Open systems - -
8650-1 interconnection - Connection-oriented
protocol for the association control
service element: Protocol specification

ISO/IEC 8802-3 2001 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 - -
Interconnexion - Connection-oriented
presentation protocol: Protocol
specification
ISO/IEC 8824-1 2000 Information technology - Abstract Syntax - -
Notation One (ASN.1): Specification of
basic notation
A1 2000 - -
A2 2000 - -
ISO/IEC 8825-1 2000 Information technology - ASN.1 encoding - -
rules: Specification of Basic Encoding
Rules (BER), Canonical Encoding Rules
(CER) and Distinguished Encoding Rules
(DER)
- 5 - EN 61850-9-2:2004
Publication Year Title EN/HD Year
ISO 9506-1 2003 Industrial automation systems - - -
Manufacturing Message Specification
Part 1: Service definition
ISO 9506-2 2003 Part 2: Protocol specification - -

IEEE 754 1985 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 1981 Internet Protocol - -

RFC 792 Internet Control Message Protocol - -

RFC 793 1981 Transmission Control Protocol (TCP), - -
Internet Activities Board recommended
standard
RFC 826 1982 Address Resolution Protocol (ARP), - -
Internet Activities Board elective standard

RFC 894 1984 Internet Protocol on Ethernet Networks, - -
Internet Activities Board elective standard

RFC 919 1984 Broadcasting Internet Datagrams - -

RFC 1006 1989 ISO transport services on top of TCP: - -
Version 3
RFC 1112 1989 Host Extensions for IP Multicasting - -

INTERNATIONAL
IEC
STANDARD 61850-9-2
First edition
2004-04
Communication networks and systems
in substations –
Part 9-2:
Specific Communication Service Mapping (SCSM) –
Sampled values over ISO/IEC 8802-3
© IEC 2004 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale U
International Electrotechnical Commission
ɆɟɠɞɭɧɚɪɨɞɧɚɹɗɥɟɤɬɪɨɬɟɯɧɢɱɟɫɤɚɹɄɨɦɢɫɫɢɹ
For price, see current catalogue

– 2 – 61850-9-2 © IEC:2004(E)
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
5.3 SV service and communication profile .13
5.4 Restrictions.15
6 Mapping of IEC 61850-7-2 and IEC 61850-7-3 Data Attributes.16
7 Mapping of IEC 61850-7-2 classes and services .16
7.1 Classes of SV data sets .16
7.2 Definition of SV data sets .16
8 Mapping of the model for the transmission of sampled values .16
8.1 Overview.16
8.2 Mapping of the multicast sampled value control block class and services .16
8.3 Mapping of the unicast sampled value control block class and services .17
8.4 Mapping of the update of the sampled value buffer.19
8.5 Additional definitions for the transmission of sampled values.19
8.6 Definitions for basic data types .21
9 Conformance.21
9.1 Notation.21
9.2 PICS .21
10 Substation Configuration language (SCL).23
Annex A (informative) ISO/IEC 8802-3 frame format and ASN.1 basic encoding rules.24
Annex B (informative) Process bus architectures .27
Annex C (informative) Multicast address selection .28
Figure 1 – OSI reference model and profiles.10
Figure 2 – Structure of the tag header .14
Figure 3 – Concatenation of several ASDU's into one frame .19
Figure A. 1 – ISO/IEC 8802-3 frame format .24
Figure A.2 – Basic encoding rules format .25
Figure A.3 – Format of the tag octets .25
Figure A.4 – Example for an ASN.1 coded APDU frame structure.26
Figure B.1 – Alternative process bus architectures .27

61850-9-2 © IEC:2004(E) – 3 –
Table 1 – Service requiring client/server communication profile .11
Table 2 – Service and protocols for client/server communication A-Profile .12
Table 3 – Service and Protocols for Peer TCP/IP T-Profile.12
Table 4 – Service requiring SV communication profile .13
Table 5 – Service and protocols for SV communication A-Profile .13
Table 6 – SV T-Profile .13
Table 7 – Default Virtual LAN IDs and priorities .14
Table 8 – Assigned Ethertype values .15
Table 9 – MMS TypeDescription definition for MSVCB MMS structure.17
Table 10 – Mapping of multicast sampled value services .17
Table 11 – MMS TypeDescription definition for USVCB MMS Structure.18
Table 12 – Mapping of unicast sampled value services .18
Table 13 – Encoding for the transmission of the sampled value buffer .20
Table 14 – Encoding for the basic data types.21
Table 15 – PICS for A-Profile support.22
Table 16 – PICS for T-Profile support.22
Table 17 – SV conformance statement.22
Table 18 – Definitions for SV SCL.23

– 4 – 61850-9-2 © IEC:2004(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMMUNICATION NETWORKS AND SYSTEMS IN SUBSTATIONS –
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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
57/690/FDIS 57/709/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.

61850-9-2 © IEC:2004(E) – 5 –
IEC 61850 consists of the following parts, under the general title Communication networks
and systems in substations:
Part 1: Introduction and overview
Part 2: Glossary
Part 3: General requirements
Part 4: System and project management
Part 5: Communication requirements for functions and device models
Part 6: Configuration description language for communication in electrical substations
related to IEDs
Part 7-1: Basic communication structure for substation and feeder equipment – Principles and
models
Part 7-2: Basic communication structure for substation and feeder equipment – Abstract
communication service interface (ACSI)
Part 7-3: Basic communication structure for substation and feeder equipment – Common data
classes
Part 7-4: Basic communication structure for substation and feeder equipment – Compatible
logical node classes and data classes
Part 8-1: Specific Communication Service Mapping (SCSM) – Mappings to MMS (ISO 9506-1
and ISO 9506-2) and to ISO/IEC 8802-3
Part 9-1: Specific Communication Service Mapping (SCSM) – Sampled values over serial
unidirectional multidrop point to point link
Part 9-2: Specific Communication Service Mapping (SCSM) – Sampled values over
ISO/IEC 8802-3
Part 10: Conformance testing
The committee has decided that the contents of this publication will remain unchanged until
2005. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this document may be issued at a later date.
———————
Under consideration.
– 6 – 61850-9-2 © IEC:2004(E)
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 supplement IEC 61850-9-1 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.
Process bus communication structures can be arranged in different ways as described in
Annex B and IEC 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 are 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 61850-9-1 and 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 the standard.

61850-9-2 © IEC:2004(E) – 7 –
COMMUNICATION NETWORKS AND SYSTEMS IN SUBSTATIONS –
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 on the real elements of the stack
being used, and
– the implementation specification of functionality, that 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
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 61850-7-1, Communication networks and systems in substations – Part 7-1: Basic
communication structure for substation and feeder equipment – Part 7-1: Principles and models
IEC 61850-7-2, Communication networks and systems in substations – Part 7-2: Basic
communication structure for substation and feeder equipment – Abstract communication
service interface (ACSI)
IEC 61850-7-3, Communication networks and systems in substations – Part 7-3: Basic
communication structure for substation and feeder equipment – Common data classes
IEC 61850-7-4, Communication networks and systems in substations – Part 7-4: Basic
communication structure for substation and feeder equipment – Compatible logical node
classes and data classes
IEC 61850-8-1, Communication networks and systems in substations – Part 8-1: Specific
Communication Service Mapping (SCSM) – Mappings to MMS (ISO 9506-1 and ISO 9506-2) and
to ISO/IEC 8802-3
– 8 – 61850-9-2 © IEC:2004(E)
IEC 61850-9-1, Communication networks and systems in substations – Part 9-1: Specific
Communication Service Mapping (SCSM) – Sampled values over serial unidirectional multidrop
point to point link
ISO/IEC 7498-1:1994, Information technology – Open Systems Interconnection – Basic
Reference Model: The Basic Model
ISO/IEC 8326:1996, Information processing systems – Open Systems Interconnection –
Session service definition
ISO/IEC 8327-1:1997, 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 8802-3:2001, 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 8824-1:1999, Information technology – Abstract Syntax Notation One (ASN. 1):
Specification of basic notation
Amendment 1 (2000)
Amendment 2 (2000)
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
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
RFC 792, Internet Control Message Protocol; IETF, available at
RFC 793, Transmission Control Procedure; IETF, available at
RFC 826, An Ethernet Address Resolution Protocol or Converting Network Protocol Addresses
to 48.bit Ethernet Address for Transmission on Ethernet Hardware; IETF, available at

RFC 894, A Standard for the Transmission of IP datagrams over Ethernet Networks; IETF,
available at

61850-9-2 © IEC:2004(E) – 9 –
RFC 919, Broadcasting Internet Datagrams; IETF, available at
RFC 1006 ISO transport services on top of TCP: Version 3; IETF, available at

RFC 1112, Host Extensions for IP Multicasting; IETF, available at
3 Terms and definitions
For the purposes of this document, the definitions given in IEC 61850-2 apply.
4 Abbreviations
Abstract Communication Service Interface
ACSI
ASDU Application Service Data Unit
ASN.1 Abstract Syntax Notation number One
APCI Application Protocol Control Information
APDU Application Protocol Data Unit
APPID Application Identifier
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
CSMA/CD Carrier Sense Multiple Access/Collision Detection
DF Data Frame
DO Data Object
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.
MAC Media Access Control
MAU Medium Attachment Unit
MMS Manufacturing Message Specification (ISO 9506)
Multicast Sampled Value Control Block
MSVCB
– 10 – 61850-9-2 © IEC:2004(E)
Merging Unit
MU
o Optional support. The implementor may decide to implement the item
PDU Protocol Data Unit
Protocol Implementation Conformance Statement
PICS
Specific Communication Services Mapping
SCSM
r readable
Routing Information Field (ISO/IEC 8802-5)
RIF
SV Sampled Value
TCI Tag Control Information
TPID Tag Protocol Identifier
USVCB Unicast Sampled Value Control Block
VID VLAN Identifier
VLAN Virtual Local Area Network
VMD Virtual Manufacturing Device
w Writeable
x Excluded: The implementor shall not implement this item
Extensible Markup Language
XML
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
specify the protocols to be used to achieve the functionality, nor does it restrict the solution to a
single set of protocols.
Application
A-Profile
Presentation
Session
Transport
Network
T-Profile
DataLink
Physical
IEC  096/04
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).

61850-9-2 © IEC:2004(E) – 11 –
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 data link 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.
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
– 12 – 61850-9-2 © IEC:2004(E)
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 8824-1:1999 ISO/IEC 8825-1 m
Session Connection oriented ISO/IEC 8326:1996 ISO/IEC 8327-1:1997 m
session
There is only one T-Profile (TCP/IP) that may be used by the client/server A-Profile.
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
DataLink Standard for the transmission of IP datagrams RFC 894 m
over Ethernet networks
Carrier Sense Multiple Access with Collision ISO/IEC 8802-3:2001 m
Detection (CSMA/CD)
Physical Fibre optic transmission system 100Base-FX ISO/IEC 8802-3:2001 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.

61850-9-2 © IEC:2004(E) – 13 –
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
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 8824-1:1999 ISO/IEC 8825 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
layer
Name Service specification Protocol specification
Transport
Network
DataLink Priority tagging/VLAN IEEE 802.1Q m
Carrier Sense Multiple ISO/IEC 8802-3:2001 m
Access with Collision
Detection (CSMA/CD)
Physical Fibre optic transmission ISO/IEC 8802-3:2001 c1
system 100Base-FX
Basic optical fibre IEC 60874-10-1, IEC 60874-10-2 and IEC 60874-10-3 c1
connector
NOTE This is the
specification for the ST
connector.
c1 – Recommended, but future technology could be used.

– 14 – 61850-9-2 © IEC:2004(E)
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.
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 C.
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  097/04
Key
TPID (Tag Protocol Identifier) Field:
Indicates the Ethernet Type assigned for 802.1Q Ethernet encoded frames. This value shall be 0x8100.
TCI (Tag Control Information) Fields:
User Priority: BS3; User priority value shall be set by configuration to separate sampled values from low priority
busload. If the priority is not configured then the default values of Table 7 shall be used.
CFI (Canonical Format Indicator): BS1 [0]; A single bit flag value. For this standard the CGI bit value shall be reset
(value = 0).
NOTE If set (value = 1), an Embedded Resource Identification Field (E-RIF) follows the Length/Type field in the
ISO/IEC 8802-3 tagged frame.
VID: Virtual LAN support is optional. If this mechanism will be used, the VLAN Identifier (VID) shall be set by
configuration, if it is not used, it shall be set to zero (0).
NOTE As IEEE 802.1Q allows implementation with a restricted set of priorities, the higher priority frames should
have a priority of 4 to 7 and the lower priority should have a priority of 1 to 3. The value 1 is the priority of untagged
frames thus 0 should be avoided as it may cause unpredictable delay due to normal traffic.
Additionally, since Sampled Values needs to have potentially its own bandwidth allocation, its configured VID will be
different from GOOSE and GSE.
The default values for priority and VID shall be as defined in Table 7.
Figure 2 – Structure of the tag header
Table 7 – Default Virtual LAN IDs and priorities
Service Default VID Default priority
Sampled Values 0 4
The general ISO/IEC 8802-3 frame structure for sampled values can be found in Annex A.

61850-9-2 © IEC:2004(E) – 15 –
Link layer: Ethertype and other header information
Ethertypes based on ISO/IEC 8802-3 MAC – Sublayer are registered by the IEEE authority
registration. GSE management, GOOSE and samples values shall be directly mapped to the
reserved Ethertype(s) and the Ethertype PDU. The assigned values are found in Table 8.
Table 8 – Assigned Ethertype values
Ethertype value
Use APPID type
(hexadecimal)
88-B8 0 0
IEC 61850-8-1 GOOSE
IEC 61850-8-1 GSE Management 88-B9 0 0
IEC 61850-9-1 Sampled Values 88-BA 0 1
IEC 61850-9-2 Sampled Values 88-BA 0 1
The Ethertype PDU and APDU octets shall be as defined in annex A.
NOTE
APPID: application identifier. The APPID is used to select ISO/IEC 8802-3 frames containing sampled value
messages and to distinguish the application association.
The value of APPID is the combination of the APPID type, defined as the two most significant bits of the value (as
defined in Table 8), and the actual ID.
The reserved value range for sampled values is 0x4000 to 0x7FFF. If no APPID is configured, the default value shall
be 0x4000. The default value is reserved to indicate lack of configuration. It is strongly recommended to have
unique, source orientated SV APPID within a system. This should be enforced by the configuration system.
Length: Number of octets including the Ethertype PDU header starting at APPID, and the length of the APDU
(Application Protocol Data Unit). Therefore, the value of Length shall be 8 + m, where m is the length of the APDU
and m is less than 1492. Frames with inconsistent or invalid length field shall be discarded.
The Reserved1 and Reserved2 are reserved for future standardized applications and shall be set to 0 as default.
5.4 Restrictions
This mapping is restricted to the mapping of the ACSI model for the transmission of sampled
values. The model applies to data sets. To get full benefit of IEC 61850, additional ACSI
models need to be supported in accordance to IEC 61850-8-1. As an example, to enable the
transmission of sampled value buffer, the associated control block attribute “SvEna” shall be
written. However, if the client will read a list of available data sets or the contents of the data
set, further models (for example logical device, logical node or data set) need to be supported.
This mapping specifies the transmission of data sets related to the sampled value model in
addition to the universal data set specified in IEC 61850-9-1 of this standard. The data set
status indication, which is also defined in IEC 61850-9-1, is not supported, because other
communication methods are available for transmission of binary status indications.
Data sets for sampled values will be specified by using the XML language (except the universal
data set which is defined in IEC 61850-9-1) on engineering level in accordance with IEC 61850-6
of this standard to ensure interoperability.
For the transmission of sampled value data sets, the ASN.1 Basic Encoding Rules (BER) will
be used in combination with tags notation harmonised with the MMS grammar used in
IEC 61850-8-1.
– 16 – 61850-9-2 © IEC:2004(E)
6 Mapping of IEC 61850-7-2 and IEC 61850-7-3 Data Attributes
The mapping of attributes and common data attributes to MMS are specified in IEC 61850-8-1.
F
...