IEC 61850-9-1:2003

INTERNATIONAL IEC
STANDARD
61850-9-1
First edition
2003-05
Communication networks and
systems in substations –
Part 9-1:
Specific Communication Service
Mapping (SCSM) –
Sampled values over serial unidirectional
multidrop point to point link
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INTERNATIONAL IEC
STANDARD
61850-9-1
First edition
2003-05
Communication networks and
systems in substations –
Part 9-1:
Specific Communication Service
Mapping (SCSM) –
Sampled values over serial unidirectional
multidrop point to point link
 IEC 2003  Copyright - all rights reserved
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International Electrotechnical Commission
Международная Электротехническая Комиссия
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– 2 – 61850-9-1  IEC:2003(E)
CONTENTS
FOREWORD . 4
INTRODUCTION .6
1 Scope . 7
2 Normative references. 8
3 Terms and definitions. 8
4 Abbreviations . 8
5 Principle of mapping to the serial unidirectional multidrop point to point link . 9
5.1 Communication stack. 9
5.1.1 Physical layer.10
5.1.2 Link layer .11
5.1.3 Network layer .12
5.1.4 Transport layer.12
5.1.5 Session layer .12
5.1.6 Presentation layer .12
5.1.7 Application layer.12
5.2 Restrictions.12
6 Mapping of common types.12
6.1 Object name .12
6.2 Object reference .12
7 Mapping of the model for transmission of sampled values using multicast.13
7.1 Mapping of the multicast sampled values services.13
7.2 Mapping of the update of the sampled value buffer.14
7.3 Additional definitions for the transmission of sampled analogue values .14
7.3.1 Application layer functionality .14
7.3.2 Presentation layer functionality.15
7.3.3 Transport layer functionality .15
8 Mapping of the common data classes.16
8.1 Overview .16
8.2 Additional definitions for the mapping of the common data classes .16
Annex A (normative) Definition of data set instances and related multicast sampled
value control instances .19
Annex B (informative) Calculation of required bandwidth.22
Annex C (informative) Definitions of logical node instance names and data names
related to the data sets .24
Annex D (informative) Electronic transformers block diagram and configuration example .28

61850-9-1  IEC:2003(E) – 3 –
Figure 1 – Example for the use of the serial unidirectional multidrop point to point link . 7
Figure 2 – Communication stack.10
Figure 3 – Concatenation of several ASDU’s into one APDU .14
Figure A.1 – Data set for status indication.20
Figure B.1 – Ethernet Frame Format.23
Figure C.1 – Contents of the universal data set based on the specification in IEC 60044-8 .27
Figure D.1 – Example for general block diagram of a single-phase electronic transformer .28
Figure D.2 – Example for electronic transformers configuration.29
Table 1 – Mapping of the object reference .13
Table 2 – Mapping of the multicast sampled value services.13
Table 3 – Encoding for the transmission of sampled value buffer .15
Table 4 – Extended common data class single point status information .16
Table 5 – Encoding of the common data class SPS used for the universal data set .16
Table 6 – Encoding of the common data class MV .17
Table 7 – Encoding of common data class SPS used for the status indication group.18
Table A.1 – Predefined multicast sampled value control block instances relating
to the transmission of the Universal Data Set according to IEC 60044-8.19
Table A.2 – Predefined multicast sampled value control block instances relating to the
transmission of status indications .21
Table B.1 – Selection guide for Ethernet physical layer (receiving node).22
Table B.2 – Selection guide for Ethernet physical layer (sending node) .22
Table C.1 – Definitions of logical instance name and data names related to the
universal data set .24
Table C.2 – Definitions of logical instance name and data names related to the status
indication data set .26

– 4 – 61850-9-1  IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
COMMUNICATION NETWORKS AND SYSTEMS IN SUBSTATIONS –
Part 9-1: Specific Communication Service Mapping (SCSM) –
Sampled values over serial unidirectional multidrop
point to point link
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organisation for standardisation comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardisation in the electrical and electronic fields. To
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for Standardisation (ISO) in accordance with conditions determined by agreement between the two
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equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61850-9-1 has been prepared by IEC technical committee 57:
Power system control and associated communications.
The text of this standard is based on the following documents:
FDIS Report on voting
57/619/FDIS 57/636/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.

61850-9-1  IEC:2003(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 devices 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/IEC 9506-1 and ISO/IEC 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 relationship between IEC 60044-8 and this standard is as follows:
IEC 60044-8 defines a merging unit as interface to electronic current and voltage transformers.
Data objects provided by that merging unit are specified in IEC 60044-8. This standard
specifies a serial communication interface between the merging unit and equipment using the
digital output of the merging unit like protection or metering equipment. For the specification of
that serial interface, a subset of the abstract communication services defined in IEC 61850-7-2
are mapped on an ISO/IEC 8802-3 based communication link.
The committee has decided that t
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