IEC 61850-7-2:2003

Communication networks and systems in substations - Part 7-2: Basic communication structure for substation and feeder equipment - Abstract communication service interface (ACSI)

Applies to the ACSI communication in substations and feeder applications. The ACSI provides the abstract interface describing communications between a client and a remote server; and the abstract interface for fast and reliable system-wide event distribution between an application in one device and many remote applications in different devices and for transmission of sampled measured values.

General Information

• Status: Published
• Publication Date: 11-May-2003
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: TC 57 - Power systems management and associated information exchange
• Drafting Committee: WG 10 - TC 57/WG 10
• Current Stage: DELPUB - Deleted Publication
• Start Date: 24-Aug-2010
• Completion Date: 26-Oct-2025

Relations

• Revised: IEC 61850-7-2:2010 - Communication networks and systems for power utility automation - Part 7-2: Basic information and communication structure - Abstract communication service interface (ACSI)
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
61850-7-2
First edition
2003-05
Communication networks and systems
in substations –
Part 7-2:
Basic communication structure
for substation and feeder equipment –
Abstract communication service interface (ACSI)

Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the

60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

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edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the

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amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD
61850-7-2
First edition
2003-05
Communication networks and systems
in substations –
Part 7-2:
Basic communication structure
for substation and feeder equipment –
Abstract communication service interface (ACSI)

 IEC 2003  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: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XH
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61850-7-2  IEC:2003(E)
CONTENTS
FOREWORD . 8

INTRODUCTION .10

1 Scope .11

2 Normative references.11

3 Terms and definitions.12

4 Abbreviated terms.13

5 ACSI overview and basic concepts .14

5.1 General .14
5.2 Overview of basic information models .15
5.3 Overview of the other service models .16
5.4 Overview of ACSI services .19
5.5 Type definitions.20
5.5.1 Data attribute types .20
5.5.2 BasicTypes .21
5.5.3 Common ACSI types .22
6 SERVER class model.26
6.1 SERVER class definition .26
6.1.1 SERVER class syntax .26
6.1.2 SERVER class attributes .27
6.2 Server class services .27
6.2.1 Overview of directory and GetDefinition services .27
6.2.2 GetServerDirectory.28
7 Application association model .29
7.1 Introduction.29
7.2 Concept of application associations.29
7.3 Access control .29
7.4 TWO-PARTY-APPLICATION-ASSOCIATION (TPAA) class model .30
7.4.1 TWO-PARTY-APPLICATION-ASSOCIATION (TPAA) class definition.30
7.4.2 Two-party application association services .32
7.5 MULTICAST-APPLICATION-ASSOCIATION (MCAA) class.34
7.5.1 MULTICAST-APPLICATION-ASSOCIATION (MCAA) class definition .34
8 LOGICAL-DEVICE class model .36

8.1 LOGICAL-DEVICE class definition .36
8.1.1 LOGICAL-DEVICE class syntax.36
8.1.2 LOGICAL-DEVICE class attributes .36
8.2 LOGICAL-DEVICE class services.37
8.2.1 GetLogicalDeviceDirectory .37
9 LOGICAL-NODE class model .38
9.1 LOGICAL-NODE class definition .38
9.1.1 LOGICAL-NODE class syntax.38
9.1.2 LOGICAL-NODE class attributes .38
9.2 LOGICAL-NODE class services.40
9.2.1 Overview.40
9.2.2 GetLogicalNodeDirectory.40
9.2.3 GetAllDataValues.41

61850-7-2 © IEC:2003(E) – 3 –
10 DATA class model.42

10.1 General .42

10.2 DATA class definition.42

10.2.1 DATA class syntax .42

10.2.2 DATA class attributes.45

10.3 Relation of DATA, common DATA, and compatible DATA classes .52

10.4 DATA class services .52

10.4.1 General definitions and overview .52

10.4.2 GetDataValues.53

10.4.3 SetDataValues .54
10.4.4 GetDataDirectory .55
10.4.5 GetDataDefinition.56
11 DATA-SET class model.56
11.1 General .56
11.2 DATA-SET class definition .58
11.2.1 DATA-SET class syntax .58
11.2.2 DATA-SET class attributes .58
11.3 DATA-SET class services .59
11.3.1 Overview.59
11.3.2 GetDataSetValues.59
11.3.3 SetDataSetValues .60
11.3.4 CreateDataSet .61
11.3.5 DeleteDataSet.61
11.3.6 GetDataSetDirectory .62
12 Substitution model .63
13 SETTING-GROUP-CONTROL-BLOCK class model .65
13.1 General .65
13.2 SGCB class definition .66
13.2.1 SGCB class syntax.66
13.2.2 SGCB class attributes .67
13.3 SGCB class services.68
13.3.1 Overview.68
13.3.2 SelectActiveSG .68
13.3.3 SelectEditSG.69
13.3.4 SetSGValues .70

13.3.5 ConfirmEditSGValues.71
13.3.6 GetSGValues .71
13.3.7 GetSGCBValues .72
14 REPORT-CONTROL-BLOCK and LOG-CONTROL-BLOCK class models .74
14.1 Overview .74
14.2 REPORT-CONTROL-BLOCK class model .76
14.2.1 Basic concepts.76
14.2.2 BUFFERED-REPORT-CONTROL-BLOCK (BRCB) class definition.76
14.2.3 BRCB class services .82
14.2.4 UNBUFFERED-REPORT-CONTROL-BLOCK (URCB) class definition.94
14.2.5 URCB class services.95
14.3 LOG-CONTROL-BLOCK class model .96
14.3.1 General.96
14.3.2 LCB class definition.97

– 4 – 61850-7-2  IEC:2003(E)
14.3.3 LOG class definition .101

14.3.4 Procedures to generate the log entries .104

14.3.5 LOG services .104

15 Generic substation event class model (GSE) .107

15.1 Overview .107

15.2 GOOSE-CONTROL-BLOCK (GoCB) class.109

15.2.1 GoCB definition.109

15.2.2 GOOSE service Definitions .111

15.2.3 Generic object oriented substation event (GOOSE) message.116

15.3 Generic substation state event (GSSE) control block (GsCB).117
15.3.1 GsCB class definition .117
15.3.2 Generic substation state event (GSSE) control block class attributes .119
15.3.3 GSSE service definitions .120
15.3.4 Generic substation state event (GSSE) message.124
16 Transmission of sampled value class model .126
16.1 Overview .126
16.2 Transmission of sampled values using multicast.127
16.2.1 MSVCB class definition .127
16.2.2 Multicast sampled value class services.129
16.3 Transmission of sampled values using unicast .132
16.3.1 USVCB class definition.132
16.3.2 Unicast sampled value services.134
16.4 Sampled value format .137
16.4.1 MsvID or UsvID.138
16.4.2 OptFlds.138
16.4.3 DatSet .138
16.4.4 Sample [1.n].138
16.4.5 SmpCnt.138
16.4.6 RefrTm .139
16.4.7 ConfRev.139
16.4.8 SmpSynch.139
16.4.9 SmpRate.139
17 CONTROL class model .139
17.1 Introduction.139
17.2 Control with normal security .140

17.2.1 Direct control with normal security.140
17.2.2 SBO control with normal security.141
17.3 Control with enhanced security.143
17.3.1 Introduction.143
17.3.2 Direct control with enhanced security.143
17.3.3 SBO control with enhanced security.144
17.4 Time-activated operate .146
17.5 CONTROL class service definitions.147
17.5.1 Overview.147
17.5.2 Service parameter definition.148
17.5.3 Service specification .150
18 Time and time-synchronization model.154
18.1 General .154
18.2 External information.154

61850-7-2 © IEC:2003(E) – 5 –
19 Naming conventions.155

19.1 Class naming and class specializations .155

19.2 Referencing an instance of a class.156

19.3 Scope .158

20 File transfer .159

20.1 File transfer model .159

20.1.1 FileName .159

20.1.2 FileSize [0.1].159

20.1.3 LastModified .159

20.2 File services .160
20.2.1 GetFile.160
20.2.2 SetFile .160
20.2.3 DeleteFile .161
20.2.4 GetFileAttributeValues .162
Annex A (normative) ACSI conformance statement .163
A.1 General.163
A.2 ACSI models conformance statement.164
A.3 ACSI service conformance statement .165
Bibliography .169
Index.170
Figure 1 – Excerpt of conceptual model .15
Figure 2 – Basic conceptual class model of the ACSI.16
Figure 3 – Conceptual service model of the ACSI.17
Figure 4 – Data attribute type concept .20
Figure 5 – Overview about GetDirectory and GetDefinition services .27
Figure 6 – Access views of a server.30
Figure 7 – Normal operation .31
Figure 8 – Aborting association.31

Figure 9 – Principle of multicast application association .35
Figure 10 – Class diagram of DATA and DataAttributeType.43
Figure 11 – Example of DATA.44
Figure 12 – Relation of TrgOp and Reporting .50
Figure 13 – Relation of DATA classes .52
Figure 14 – Excerpt of data class services .53
Figure 15 – Dynamic creation of data set instances.57
Figure 16 – Principles of substitution .64
Figure 17 – Basic model of the settings model .65
Figure 18 – Setting group state machine.67
Figure 19 – Basic building blocks for reporting and logging .75
Figure 20 – BRCB state machine .78

– 6 – 61850-7-2  IEC:2003(E)
Figure 21 – Buffer time.80

Figure 22 – Report example on the use of sequence number .84

Figure 23 – Data set members and reporting .86

Figure 24 – Report example.87

Figure 25 – Log model overview .96

Figure 26 – GoCB model .108

Figure 27 – Specifics for GsCB model.118

Figure 28 – Model for transmission of sampled values .126

Figure 29 – Principle of the control model .140
Figure 30 – State machine of direct control with normal security.141
Figure 31 – Direct control with normal security.141
Figure 32 – State machine of SBO control with normal security.142
Figure 33 – State machine of direct control with enhanced security .143
Figure 34 – State machine SBO control with enhanced security .144
Figure 35 – Select before operate with enhanced security – positive case .145
Figure 36 – Select before operate with enhanced security – negative case (no status
change).145
Figure 37 – Time-activated operate .147
Figure 38 – Time model and time synchronization (principle).154
Figure 39 – Specializations.155
Figure 40 – Object names and object reference .158
Table 1 – ACSI classes .19
Table 2 – BasicTypes .21
Table 3 – ObjectName type .22
Table 4 – ObjectReference type.22
Table 5 – ServiceError type .23
Table 6 – PACKED-LIST type .23
Table 7 – TimeStamp type.24
Table 8 – TimeQuality definition.24
Table 9 – TimeAccuracy .25

Table 10 – TriggerConditions type .26
Table 11 – SERVER class definition .26
Table 12 – TWO-PARTY-APPLICATION-ASSOCIATION (TPAA) class definition.31
Table 13 – MULTICAST-APPLICATION-ASSOCIATION (MCAA) class definition .35
Table 14 – LOGICAL-DEVICE (LD) class definition .36
Table 15 – LOGICAL-NODE (LN) class definition.38
Table 16 – DATA class definition .45
Table 17 – DAType definition.46
Table 18 – Functional constraints .48
Table 19 – Trigger option.49
Table 20 – COMMON-DATA class definition .51
Table 21 – DATA-SET (DS) class definition .58

61850-7-2 © IEC:2003(E) – 7 –
Table 22 – SGCB class definition.66

Table 23 – BRCB class definition.77

Table 24 – Report format specification.83

Table 25 – URCB class definition.94

Table 26 – LCB class definition.97

Table 27 – LOG class definition .102

Table 28 – GOOSE control block class definition .109

Table 29 – GOOSE message definition.116

Table 30 – GSSE control block class definition .118
Table 31 – GSSE message definition.125
Table 32 – MSVCB class definition .127
Table 33 – USVCB class definition.132
Table 34 – Sampled value (SV) format definition.138
Table 35 – Control services .147
Table 36 – Control time-stamp definition.148
Table 37 – Test status definition .148
Table 38 – Check condition definition.148
Table 39 – Additional cause diagnosis definition .149
Table 40 – AddCause semantic .149
Table 41 – TimeActivatedOperate response definition.150
Table 42 – List of ObjectReferences .156
Table 43 – FILE class definition.159
Table A.1 – Basic conformance statement .163
Table A.2 – ACSI models conformance statement.164
Table A.3 – ACSI service conformance statement.165

– 8 – 61850-7-2  IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
COMMUNICATION NETWORKS AND SYSTEMS IN SUBSTATIONS –

Part 7-2: Basic communication structure

for substation and feeder equipment –

Abstract communication service interface (ACSI)

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
this end and in addition to other activities, the IEC publishes International Standards. 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 organisations liaising
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for Standardisation (ISO) in accordance with conditions determined by agreement between the two
organisations.
2) The formal decisions or agreements of the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
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 61850-7-2 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
57/612/FDIS 57/629/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.
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
———————
To be published.
61850-7-2 © IEC:2003(E) – 9 –
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/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 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 publication may be issued at a later date.

———————
To be published.
– 10 – 61850-7-2  IEC:2003(E)

INTRODUCTION
This document is part of a set of specifications which details a layered substation commu-

nication architecture. This architecture has been chosen to provide abstract definitions of

classes and services such that the specifications are independent of specific protocol stacks,

implementations, and operating systems.

The IEC 61850 series is intended to provide interoperability between a variety of substation

and feeder devices. Communication between these devices is achieved by the definition of a

hierarchical class model (for example, logical device, logical node, data, data set, report

control, or log) and services provided by these classes (for example, get, set, report, define,

delete) in parts IEC 61850-7-x.
This part of IEC 61850 defines the abstract communication service interface (ACSI) for use in
the utility substation domain that require real-time cooperation of intelligent electronic devices.
The ACSI has been defined so as to be independent of the underlying communication systems.
Specific communication service mappings (SCSM) are specified in part 8-x and part 9-x of this
standard.
This part of IEC 61850 defines the abstract communication service interface in terms of
– a hierarchical class model of all information that can be accessed via a communication
network,
– services that operate on these classes, and
– parameters associated with each service.
The ACSI description technique abstracts away from all the different approaches to implement
the cooperation of the various devices.
NOTE 1 Abstraction in ACSI has two meanings. First, only those aspects of a real device (for example, a breaker)
or a real function that are visible and accessible over a communication network are modelled. This abstraction
leads to the hierarchical class models and their behaviour defined in IEC 61850-7-2, IEC 61850-7-3, and
IEC 61850-7-4. Second, the ACSI abstracts from the aspect of concrete definitions on how the devices exchange
information; only a conceptual cooperation is defined. The concrete information exchange is defined in the SCSMs.
NOTE 2 This part of IEC 61850 does not provide comprehensive tutorial material. It is recommended that
IEC 61850-5 and IEC 61850-7-1 be read first in conjunction with IEC 61850-7-2 and IEC 61850-7-3.
NOTE 3 Examples use names of classes (e.g. XCBR for a class of a logical node) defined in IEC 61850-7-4 and
IEC 61850-7-3. The normative names are defined in IEC 61850-7-4 and IEC 61850-7-3 only.

———————
The ACSI is independent of the specific mapping. Mappings to standard application layers or middle ware
technologies are possible.
61850-7-2 © IEC:2003(E) – 11 –

COMMUNICATION NETWORKS AND SYSTEMS

IN SUBSTATIONS –
Part 7-2: Basic communication structure

for substation and feeder equipment –

Abstract communication service interface (ACSI)

1 Scope
This part of IEC 61850 applies to the ACSI communication in substations and feeder
applications. The ACSI provides the following abstract interfaces.
a) Abstract interface describing communications between a client and a remote server for
– real-time data access and retrieval,
– device control,
– event reporting and logging,
– publisher/subscriber,
– self-description of devices (device data dictionary),
– data typing and discovery of data types, and
– file transfer.
b) Abstract interface for fast and reliable system-wide event distribution between an applica-
tion in one device and many remote applications in different devices (publisher/subscriber)
and for transmission of sampled measured values (publisher/subscriber).
This part of IEC 61850 may also be applied to describe device models and functions for
additional activities, such as:
– substation to substation information exchange,
– substation to control centre information exchange,
– power plant to control centre information exchange,
– information exchange for distributed generation, or
– information exchange for metering.

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 61850-2, Communication networks and systems in substations – Part 2: Glossary
IEC 61850-5, Communication networks and systems in substations – Part 5: Communication
requirements for functions and devices models
IEC 61850-7-1, Communication networks and systems in substations – Part 7-1: Basic
communication structure for substation and feeder equipment – Principles and models

– 12 – 61850-7-2  IEC:2003(E)

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/IEC 9506-1 and ISO/IEC

9506-2) and to ISO/IEC 8802-3
3 Terms and definitions
For the purpose of this document, the terms and definitions provided in IEC 61850-2 and the
following definitions apply.
3.1
class
description of a set of objects that share the same attributes, services, relationships, and
semantics
3.2
client
entity that requests a service from a server and that receives unsolicited messages from
a server
3.3
device
entity that performs control, actuating and/or sensing functions and interfaces to other such
entities within an automation system
NOTE Devices alone do not perform energy transport functions.
3.4
external equipment
entity that is stand-alone, or interfaces to an automation system, and that performs energy transport
functions
EXAMPLE Transformer, circuit-breaker, line.
NOTE 1 Equipment can contain devices.
NOTE 2 Equipment cannot have a direct connection to the communication network – only devices can be directly
connected to the communication network.

3.5
instance (of a class)
entity that has unique identity, to which a set of services can be applied, and which has a state
that stores the effects of the services
NOTE Instance is a synonym for the term object.
3.6
Logical device
entity that represents a set of typical substation functions
3.7
Logical node
entity that represents a typical substation function

61850-7-2 © IEC:2003(E) – 13 –

3.8
physical device
entity that represents the physical parts of a device (hardware and operating system, etc.)

NOTE Physical devices host logical devices.

4 Abbreviated terms
AA APPLICATION-ASSOCIATION
ACSI abstract communication service Interface

BRCB BUFFERED-REPORT-CONTROL-BLOCK
CDC common DATA class (IEC 61850-7-3)
CT current transformer
DA data attribute
DAType data attribute type
DataRef data reference
d
...

This PDF file has been prepared by TC 57 experts and is made

available to assist the users of the IEC 61850-7 series.

Please note:
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ƒ Adobe Acrobat 6.0 is required to navigate through this file.

Any comments on these files are to be communicated to the following
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IEC 61850 - Communication networks and systems in substations

Informative tutorial on the object models

NOTE 1 These pdf files (html pages) are intended to provide a hypertext version of an excerpt of the main

concepts and definitions of Parts IEC 61850-7-4, IEC 61850-7-3, and IEC 61850-7-2.

NOTE 2 The content of these files is informative only. They do in no way replace the normative definitions

contained in the above referenced documents.

There are the following pages to browse and study the object models:

1. Modeling approach of logical nodes (one page - pdf)
2. IEC 61850-7-2 Overview of ACSI models
3. Logical nodes of 61850-7-4
4. Common data classes in a single window
The xml files containg the models are (not available in the pdf format):
- Logical Nodes from IEC 61850-7-4:2003 LN.xml
- DATA Semantics from IEC 61850-7-4:2003 Data-Sematic.xml
- DATA-Attributes from IEC 61850-7-3:2003 CDC.xml
- DATA-Attribute Semantics from IEC 61850-7-3:2003 DA-Semantic.xml
- Common Data Attributes from IEC 61850-7-3:2003 CDA.xml
These xml files can be used to produce any other presentation. They should not be used as normative
xml documents.
Parts of the standard
�   IEC 61850-1, Part 1: Introduction and overview

�   IEC 61850-2, Part 2: Glossary
�   IEC 61850-3, Part 3: General requirements
�   IEC 61850-4, Part 4: System and project management
�   IEC 61850-5, Part 5: Communication requirements for functions and devices models
�   IEC 61850-6, Part 6: Configuration description language for communication in electrical
substations related to IEDs
�   IEC 61850-7-1, Part 7-1: Basic communication structure for substation and feeder equipment -
Principles and models
�   IEC 61850-7-2, Part 7-2: Basic communication structure for substation and feeder equipment -
Abstract communication service interface (ACSI)
�   IEC 61850-7-3, Part 7-3: Basic communication structure for substation and feeder equipment -
Common data classes
�   IEC 61850-7-4, Part 7-4: Basic communication structure for substation and feeder equipment -
Compatible logical node classes and data classes
�   IEC 61850-8-1, 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
�   IEC 61850-9-1, Part 9-1: Specific communication service mapping (SCSM) - Sampled values

over serial unidirectional multidrop point to point link

�   IEC 61850-9-2, Part 9-2: Specific communication service mapping (SCSM) - Sampled values

over ISO/IEC 8802-3
�   IEC 61850-10, Part 10: Conformance testing

The web pages and the corresponding xml files have been created by

Karlheinz Schwarz, SCC. ([e-mail])

SCC does not take any responsibility as to the content of the files contained in the ZIP file

"IEC61850_HTML.zip" (html, xml and jpg) or the "browsable" pdf file and linked on this page

respectively.
Karlheinz Schwarz, based in Karlsruhe, Germany, is a consultant for the power systems control
industry. He is involved in several Working Groups within IEC TC 57, TC 65, and TC 88. He is a well-
known authority on the standardization and application of advanced information and communication
technologies.
© IEC 2004
Version 1.1  2004-03-22
SV
SV
SV
SV
What is a Logical Node?
By Karlheinz Schwarz, SCC, [e-mail]

Motivation
The standard IEC 61850 „Communication networks and systems in substations“ and the

coming standard IEC 61400-25 „Communications for monitoring and control of wind power
plants“ use the concept of Logical Nodes (LN) as a key element to define the information of
a device to be communicated. This paper introduces the concept of LNs.

Modeling
A key issue are the LNs representing functions or equipment used in power systems. Each

oncept
LN provides a list of well organized and named information. The LN “XCBR5” represents

the “circuit breaker” number 5 with the data “Pos” (Position) and “Mode”. Services defined

in IEC 61850-7-2 allow the exchange of this information.

logical device (Bay)
IEC 61850-7-2
(Virtual World) virtualisation
Services
IEC 61850
models substation
equipment and func-
LN
TCP/IP
tions (focus is on
LNLN
MMS
LN
Network
protection)
IEC 61400-25 XCBR5
models components
Pos
SCSM
of wind power plants
IEC 61850-8-1
Mode
like rotor, generator,
...
Real
gear box, nacelle etc. devices in a
substation
IEC 61850-7-4 logical
(focus is on SCADA)
IEC 61850-7-4
node (circuit breaker)
data (Position)
IEC 61850-6
configuration file, XML
The substation configuration language in part 6 supports the engineering process.
Example LN
The measurement LN “MMXU” represents power, voltages, currents, and impedances in a
“MMXU”
three-phase system. The values can be communicated by various services

Logical Node „MMXU“
Read
deadbanded value
Read
TotW Total Active Power (Total P)
angle
TotVAr Total Reactive Power (Total Q)

TotVA phsA.cVTotal Appareal nt Power (Total S)
Report
Report RCB
IEC 61850-7-4 RCB
TotPF phsB.cVAverage alPower factor (Total PF)

defines some
Hz phsCFrequency.cVal
90 LNs
PPV Phase to phase voltages (VL1VL2, …)
QueryLog
QueryLog
Log
Log
500 Data PhV Phase to ground voltages (VL1ER, …)
100 Attributes A Phase currents (IL1, IL2, IL3)
10 Service models W Phase active power (P)
Configure
Configure
Phase reactive power (Q)
VAr
IEC 61400-25
VA Phase apparent power (S)
Retrieve
adds some
Retrieve
PF Phase power factor
Model
Model
10 LNs
Z Phase Impedance
200 Data
IEC 61850-7-2
100 Attributes
current / voltage samples from instrument
IEC 61850-7-2
transformers represented by LN “PhsBTCTR” for
current transformer of phase B (e.g. by sampled LN PhsBTCTR LN PhsBTVTR
LN PhsBTCTR LN PhsBTVTR
Amp Vol
value exchange services of IEC 61850-7-2 SV) Amp Vol

The “MMXU” LN offers hundreds of values: measured (process) values, configuration val-
ues, description, and substitution values. These values can be communicated by various
services like read (polling), notification (publish/subscribe), logging and query.
© SCC Draft 0-2 2004-01-03
Mapping
ACSI overview and basic concepts
General
The models of the ACSI provide

�   the specification of a basic model for the definition of the substation-specific information models contained

in IEC 61850-7-3 (common DATA classes) and IEC 61850-7-4 (compatible LOGICAL-NODE classes and

compatible DATA classes) and
�   the specification of information exchange service models.

The information models and information exchange services are interwoven. From a descriptive point of view, the

two aspects are separated to some degree (see the excerpt shown in Figure 1). The common models (for

example, LOGICAL-NODE and DATA classes including their services) are applied in IEC 61850-7-3 and IEC

61850-7-4 to define many specialized information models - the substation automation models.
Figure 1 - Excerpt of conceptual model
Other service models required for substation automation systems (for example, DATA-SET and reporting provide
specific information exchange services) are also defined in this part of the standard; these models are linked to
LOGICAL-NODEs and DATA. The information exchange services are completely defined in the ACSI. The
information models defined in IEC 61850-7-4 reference the services defined in the various models of the ACSI.

Overview of basic information models
The conceptual models to build the domain-specific information models are:
�   SERVER - represents the external visible behaviour of a device. All other ACSI models are part of the
server.
NOTE 1 A server has two roles: to communicate with a client (most service models in IEC 61850 provide
communication with client devices) and to send information to peer devices (for example, for sampled
values).
�   LOGICAL-DEVICE (LD) - contains the information produced and consumed by a group of domain-specific
application functions; functions are defined as LOGICAL-NODEs.
�   LOGICAL-NODE (LN) - contains the information produced and consumed by a domain-specific application
function, for example, overvoltage protection or circuit-breaker.
�   DATA - provide means to specify typed information, for example, position of a switch with quality
information and timestamp, contained in LOGICAL-NODEs.

Each of these information models is defined as a class. The classes comprise attributes and services. The
conceptual class diagram of the ACSI is depicted in Figure 2.

NOTE 2 The classes are major building blocks that provide the framework for substation automation device

models. Additional details on the modelling and relations between IEC 61850-7-4, IEC 61850-7-3, and this part of

IEC 61850 can be found in IEC 61850-7-1.

Click on boxes to get the definitions!

Figure 2 - Basic conceptual class model of the ACSI
Click on boxes to get the definitions!

NOTE 3 The numbers in the circles indicate the respective clauses in this part of IEC 61850.
The Name class is inherited by the classes LOGICAL-DEVICE, LOGICAL-NODE, DATA, and DataAttribute.
EXAMPLE In an implementation the logical device, logical node, data, and data attribute have each an object
name (instance name) which is a unique name among classes of the same container to which they belong. In
addition, each of the four has an ObjectReference (path name) which is a concatenation of all object names from
each container. The four object names (one per column) can be concatenated.
Logical device Logical node Data Data attribute
Object name "Atlanta_HV5" "XCBR1" "Pos" "stVal"

Description
High-voltage station 5 Circuit-breaker 1 Position Status value

Overview of the other service models

In addition to the models listed above, the ACSI comprises the following models that provide services operating

on data, data attributes, and data sets.

�   DATA-SET - permits the grouping of data and data attributes. Used for direct access and for reporting and

logging.
�   Substitution - supports replacement of a process value by another value.

�   SETTING-GROUP-CONTROL-BLOCK - defines how to switch from one set of setting values to another

one and how to edit setting groups.

�   REPORT-CONTROL-BLOCK and LOG-CONTROL-BLOCK - describe the conditions for generating

reports and logs based on parameters set by the client. Reports may be triggered by changes of process
data values (for example, state change or dead band) or by quality changes. Logs can be queried for later
retrieval. Reports may be sent immediately or deferred. Reports provide change-of-state and sequence-of-
events information exchange.
�   control blocks for generic substation event (GSE) - supports a fast and reliable system-wide distribution of
input and output data values; peer-to-peer exchange of IED binary status information, for example, a trip
signal.
�   control blocks for transmission of sampled values - fast and cyclic transfer of samples, for example, of
instrument transformers.
�   control - describes the services to control, for example, devices.
�   time and time synchronization - provides the time base for the device and system.
�   file transfer - defines the exchange of large data blocks such as programs.
An overview of the conceptual service model of the ACSI is shown in Figure 3.
Click on boxes to get the definitions!

Figure 3 - Conceptual service model of the ACSI

Click on boxes to get the definitions!
NOTE 1 The numbers in the circles indicate the respective clauses in this part of IEC 61850.
NOTE 2 The class diagrams are conceptual. Details are defined in the respective clauses. Comprehensive
diagrams are contained in IEC 61850-7-1. The DATA class may be defined recursively. The operations for
substitution and control are restricted to the lowest level in the DATA class. The DataAttributes may be defined
recursively as well.
The logical node is one of the major building blocks that has associations to most of the other information
exchange models, for example, report control, log control, and setting control.
Any other information exchange service model, for example, report control, log control, and setting control shall
inherit the ObjectName and ObjectReference as depicted in Figure 2.
NOTE 3 The class models and services are defined using an object-oriented approach allowing for the mapping

of class models and services to different application layer and middle ware solutions.
Overview of ACSI services
The complete list of ACSI classes and their services is shown in Table 1.

Table 1 - ACSI classes
SERVER model (Clause 6) LOG-CONTROL-BLOCK model:

GetServerDirectory GetLCBValues

SetLCBValues
QueryLogByTime
ASSOCIATION model (Clause 7)
QueryLogAfter
Associate
GetLogStatusValues
Abort
Release
Generic substation event model —
GSE (Clause 15)
LOGICAL-DEVICE model (Clause 8)
GOOSE
GetLogicalDeviceDirectory
SendGOOSEMessage
GetGoReference
LOGICAL-NODE model (Clause 9)
GetGOOSEElementNumber
GetLogicalNodeDirectory
GetGoCBValues
GetAllDataValues
SetGoCBValues
GSSE
DATA model (Clause 10)
SendGSSEMessage
GetDataValues
GetGsReference
SetDataValues
GetGSSEDataOffset
GetDataDirectory
GetGsCBValues
GetDataDefinition
SetGsCBValues
DATA-SET model (Clause 11)
Transmission of sampled values model
GetDataSetValues
(Clause 16)
SetDataSetValues
MULTICAST-SAMPLE-VALUE-CONTROL-BLOCK:
CreateDataSet
SendMSVMessage
DeleteDataSet
GetMSVCBValues
GetDataSetDirectory
SetMSVCBValues
UNICAST-SAMPLE-VALUE-CONTROL-BLOCK:
Substitution model (Clause 12)
SetDataValues SendUSVMessage
GetUSVCBValues
GetDataValues
SetUSVCBValues
SETTING-GROUP-CONTROL-BLOCK model
Control model (Clause 17)
(Clause 13)
Select
SelectActiveSG
SelectWithValue
SelectEditSG
Cancel
SetSGValues
Operate
ConfirmEditSGValues
CommandTermination
GetSGValues
TimeActivatedOperate
GetSGCBValues
Time and time synchronization (Clause 18)
TimeSynchronization
REPORT-CONTROL-BLOCK and LOG-
CONTROL-BLOCK model (Clause 14) FILE transfer model (Clause 20)
BUFFERED-REPORT-CONTROL-BLOCK: GetFile
SetFile
Report
DeleteFile
GetBRCBValues
GetFileAttributeValues
SetBRCBValues
UNBUFFERED-REPORT-CONTROL-BLOCK:
Report
GetURCBValues
SetURCBValues
5 ObjectName
The ObjectName shall specify a unique instance name among instances of a class owned by the same parent

class with a type as specified in Table 3 - ObjectName type

ObjectName type
Attribute name Attribute type Value/value range/explanation Used by

ObjectName VISIBLE STRING32 Name of an instance of a class of a IEC 61850-7-4
single hierarchy level IEC 61850-7-3
IEC 61850-7-2
NOTE Clause 19 specifies constraints on the use of the type ObjectName.
5 ObjectReference
Instances of classes in the hierarchical information model (ACSI class hierarchy of logical device, logical node,
data, data attributes) shall be constructed by the concatenation of all instance names comprising the whole
path-name of an instance of a class that identifies the instance uniquely. The type of the ObjectReference shall
be as specified in Table 4.
Table 4 - ObjectReference type
ObjectReference type
Attribute name Attribute type Value/value range/explanation Used by
ObjectReference VISIBLE STRING255 ObjectReference comprises the IEC 61850-7-2
whole path-name of an instance of a
class that identifies the instance

uniquely
The ObjectReference syntax shall be:
LDName/LNName[.Name[. .]]
The "/" shall separate the instance name of a logical device (LDName) from the name of an instance of a
logical node (LNName). The "." shall separate the further names in the hierarchy. The "[ ]" shall indicate an
option. The inner square bracket "[. .]" shall indicate further names of recursively nested definitions.
NOTE 1 In any case where the context of the text provides sufficient information that an instance of a class is
meant, the term "instance of" is not used.

NOTE 2 Clause 19 specifies constraints on the use of the type ObjectReference.

6 Server
The class SERVER shall represent the externally visible behaviour of a device. The SERVER shall be a

composition as defined in Table 11.

NOTE 1 For simple devices the server may comprise just one logical device with the GOOSE control model

with no other service.
Table 11 - SERVER class definition

SERVER class
Attribute name Attribute type Value/value range/explanation
ServiceAccessPoint [1.n] (*) (*) Type is SCSM specific
LogicalDevice [1.n] LOGICAL-DEVICE
File [0.n] FILE
TPAppAssociation [0.n] TWO-PARTY-APPLICATION-
ASSOCIATION
MCAppAssociation [0.n] MULTICAST-APPLICATION-
ASSOCIATION
Services
GetServerDirectory
NOTE 2 The server's relationship to the underlying communication system and the concrete implementation
depend on the SCSM (specific communication service mapping, see IEC 61850-8-x and IEC 61850-9-x) used.
Network management (as part of an SCSM), device management, and system management are outside the
scope of IEC 61850-7-2.
8 Logical Device
The LOGICAL-DEVICE (LD) shall be a composition of LOGICAL-NODE as defined in Table 14.
NOTE- A LOGICAL-DEVICE can be used simply as a container of a group of LOGICAL-NODEs or as a device
that functions as a gateway or proxy. Details on the use of LOGICAL-DEVICE can be found in IEC 61850-7-1.
Table 14 - LOGICAL-DEVICE (LD) class definition
LOGICAL-DEVICE class
Attribute name Attribute type Value/value range/explanation
LDName ObjectName Instance name of an instance of LOGICAL-

DEVICE
LDRef ObjectReference Path-name of an instance of LOGICAL-

DEVICE
LogicalNode [3.n] LOGICAL-NODE IEC 61850-7-4 specifies specialized classes
of LOGICAL-NODE
Services
GetLogicalDeviceDirectory
9 LOGICAL NODE
The LOGICAL-NODE shall be a composition of DATA, DATA-SET, BRCB, URCB, LCB, LOG, SGCB, GoCB,
GsCB, MSVCB, and USVCB as defined in Table 15.
Table 15 - LOGICAL-NODE (LN) class definition
LOGICAL-NODE class
Attribute name Attribute type Explanation
LNName ObjectName Instance name of an instance of
LOGICAL-NODE
LNRef ObjectReference Path-name of an instance of
LOGICAL-NODE
Data [1.n] DATA
DataSet [0.n] DATA-SET
BufferedReportControlBlock [0.n] BRCB
UnbufferedReportControlBlock [0.n] URCB
LogControlBlock [0.n] LCB
IF compatible LN class defined in IEC 61850-7-4 equals LLN0
SettingGroupControlBlock [0.1] SGCB
Log [0.1] LOG
GOOSEControlBlock [0.n] GoCB
GSSEControlBlock [0.n] GsCB
MulticastSampledValueControlBlock [0.n] MSVCB

UnicastSampledValueControlBlock [0.n] USVCB

Services
GetLogicalNodeDirectory
GetAllDataValues
NOTE 1 IEC 61850-7-4 defines specialized logical node classes - the compatible logical node classes, for
example, XCBR representing circuit-breakers.
The definition of LOGICAL-NODEs for the substation-application domain is refined by the definition of specific
DATAin IEC 61850-7-4. The definitions in IEC 61850-7-4 (and IEC 61850-7-3 for the common DATA classes)
shall be taken into account to get the comprehensive definition of substation-domain-specific LOGICAL-
NODEs.
NOTE 2 IEC 61850-7-4 defines further attributes for LOGICAL-NODEs; for example,, the mode (behaviour:
ON, BLOCKED, TEST, etc.) of the substation-specific LOGICAL-NODE is defined in IEC 61850-7-4. The state
model of a LOGICAL-NODE is modelled as a specific DATA (named Mod).
10 Data
The DATA shall have the structure defined in Table 16.
Table 16 - DATA class definition
DATA class
Attribute name Attribute type Value/value range/explanation
DataName ObjectName Instance name of an instance of DATA,
for example, PhV (1st level), phsA (2nd
level)
DataRef ObjectReference Path-name of an instance of DATA,
for example, MMXU1.PhV or
for example, MMXU1.PhV.PhsA
Presence BOOLEAN Indicates mandatory/optional

DataAttribute [0.n] DAType For example, Vector class of IEC 61850-7-
DataAttributeTypeFunctionalConstraint FC 3
TrgOp [0.n] TriggerConditions for example, MX
for example, dchg
Specializations of DATA
CompositeCDC [0.n] DATA For example, WYE class of IEC 61850-7-3

SimpleCDC [0.n] COMMON-DATA For example, CMV class of IEC 61850-7-3

Services
GetDataValues
SetDataValues
GetDataDirectory
GetDataDefinition
An instance of a DATA class may contain zero or more instances of a CompositeCDC, SimpleCDC or a
DataAttribute. However, they cannot all be absent, so at least one of these elements shall be present.
NOTE 5 The structure of a DATA class is recursive since a CompositeCDC is also of type DATA class. The
level of recursion may be restricted by a SCSM, so the number of levels of recursion of CompositeCDCs is
normally no greater than 1.
NOTE 6 DATA or part of a DATA may be referenced in a DATA-SET. The persistent existence of DATA is
expected as long as they are referenced as members of a DATA-SET. A system has to take special measures
to ensure their existence.
10 Data Attribute Type
The DAType shall be as defined in Table 17.
Table 17 - DAType definition
DAType
Attribute name Attribute type Value/value range/explanation
DATName ObjectName Instance name of an instance of DAType,
for example, cVal (1stlevel), mag (2nd level), f
(3rd level)
DATRef ObjectReference Path-name of an instance of DAType
for example, MMXU1.PhV.phsA.cVal
for example, MMXU1.PhV.phsA.cVal.mag or
for example, MMXU1.PhV.phsA.cVal.mag.f
Presence BOOLEAN Indicates mandatory/optional

Specializations of DAType
CompositeComponent [0.n] DAType For example, mag in Vector class of IEC 61850-

7-3
for example, f in AnalogueValue of IEC 61850-7-

PrimitiveComponent [0.1] BasicType For example, FLOAT32 class of IEC 61850-7-3

for f
NOTE 1 An instance of a DAType may contain 0 or more instances of a CompositeComponent or a

PrimitveDAT. However, they cannot both be absent, so at least one of these elements must be present.

NOTE 2 The structure of a DAType is recursive since a CompositeComponent is also of type DAType. The

level of recursion may be restricted by a SCSM, so the number of levels of recursion of
CompositeComponents is normally no greater than 2.
11 DATA-SET class syntax
The DATA-SET shall have the structure as defined in Table 21.
Table 21 - DATA-SET (DS) class definition
DATA-SET class
Attribute name Attribute type Value/value range/explanation
DSName ObjectName Instance name of an instance of DATA-SET
DSRef ObjectReference Path-name of an instance of DATA-SET
DSMemberRef [1.n] (*) (*) Functionally constrained data (FCD) or
functionally constrained data attribute (FCDA)
Services
GetDataSetValues
SetDataSetValues
CreateDataSet
DeleteDataSet
GetDataSetDirectory
13 SETTING-GROUP-CONTROL-BLOCK class model
The SGCB shall have the structure defined in Table 22.
Clients should use the existence of a SGCB to determine if the LOGICAL-DEVICE contains SGs.
Table 22 - SGCB class definition

SGCB class
Attribute name Attribute type FC TrgOp Value/value range/explanation

SGCBName ObjectName - - Instance name of an instance of SGCB

SGCBRef ObjectReference - - Path-name of an instance of SGCB

NumOfSG INT8U SP - n = NumOfSG

ActSG INT8U SP dchg Allowable range: 1 . n

EditSG INT8U SP dchg Allowable range: 0 . n
CnfEdit BOOLEAN SP dchg
LActTm TimeStamp SP dchg
Services
SelectActiveSG
SelectEditSG
SetSGValues
ConfirmEditSGValues
GetSGValues
GetSGCB Values
Values of the attributes of the instances of SGCB shall be configured.
14 BUFFERED-REPORT-CONTROL-BLOCK (BRCB)
The BRCB class shall have the structure defined in Table 23.

Table 23 - BRCB class definition
BRCB class
Attribute name Attribute type FC TrgOp Value/value range/explanation
BRCBName ObjectName - - Instance name of an instance of BRCB
BRCBRef ObjectReference - - Path-name of an instance of BRCB
Specific to report handler
RptID VISIBLE STRING65 BR -
RptEna BOOLEAN BR dchg
DatSet ObjectReference BR dchg

ConfRev INT32U BR dchg
OptFlds PACKED LIST BR dchg
sequence-number BOOLEAN
report-time-stamp BOOLEAN
reason-for-inclusion BOOLEAN
data-set-name BOOLEAN
data-reference BOOLEAN
buffer-overflow BOOLEAN
entryID BOOLEAN
conf-revision BOOLEAN
BufTm INT32U BR dchg
SqNum INT16U BR -
TrgOp TriggerConditions BR dchg
IntgPd INT32U BR dchg 0. MAX; 0 implies no integrity report.

GI BOOLEAN BR -
PurgeBuf BOOLEAN BR -
EntryID EntryID BR -
TimeOfEntry EntryTime BR -
Services
Report
GetBRCBValues
SetBRCBValues
These attributes determine the service procedures of the Report service. The impact of the various values
shall be as defined in the following attribute definitions.

14 UNBUFFERED-REPORT-CONTROL-BLOCK (BRCB)

The URCB class shall have the structure defined in Table 25.

Table 25 - URCB class definition

URCB class
Attribute name Attribute type FC TrgOp Value/value range/explanation
URCBName ObjectName - - Instance name of an instance of URCB
URCBRef ObjectReference - - Path-name of an instance of URCB
Specific to report handler
RptID VISIBLE STRING65 RP -
RptEna BOOLEAN RP dchg
Resv BOOLEAN RP -
DatSet ObjectReference RP dchg
ConfRev INT32U RP dchg
OptFlds PACKED LIST RP dchg
reserved BOOLEAN
sequence-number BOOLEAN
report-time-stamp BOOLEAN
reason-for-inclusion BOOLEAN
data-set-name BOOLEAN
data-reference BOOLEAN
reserved BOOLEAN Used for buffer-overflow in BRCB

reserved BOOLEAN Used for entryID in BRCB
conf-revision BOOLEAN
BufTm INT32U RP dchg 0 . MAX
SqNum INT8U RP -
TrgOp TriggerConditions RP dchg

IntgPd INT32U RP dchg 0. MAX
GI BOOLEAN BR -
Services
Report
GetURCBValues
SetURCBValues
Except URCBName, URCBRef, RptEna, and Resv all other attributes shall be as defined for the BRCB in
14.2.2.
14 LOG-CONTROL-BLOCK class model
The LCB shall control the procedures that are required for storing values of DataAttribute (the log entry) into a
LOG. Each enabled LCB shall associate DATA-SET with a LOG. Changes in a value of a member of a DATA-
SET shall be stored as LOG entry. Multiple LCBs allow multiple DATA-SETs to feed a LOG.
It shall be the responsibility of access control, to prevent unauthorized clients to modify an LCB.
NOTE The internal notification, local storage mechanism, internal formats, etc. for log entries are all local
issues and outside the scope of this part of IEC 61850.

The LCB shall have the structure specified in Table 26.
Table 26 - LCB class definition
LCB class
Attribute name Attribute type FC TrgOp Value/value range/explanation
LCBName ObjectName - - Instance name of an instance of LCB
LCBRef ObjectReference - - Path-name of an instance of LCB
Specific to log handler
LogEna BOOLEAN LG dchg
DatSet ObjectReference LG dchg

OptFlds PACKED LIST LG dchg
reason-for-inclusion BOOLEAN
TrgOp TriggerConditions LG dchg Valid values for TrgOp of type

TriggerConditions shall be dchg, qchg,

dupd, and integrity.
IntgPd INT32U LG dchg 1.MAX; 0 implies no integrity logging.

Specific to building the log
LogRef ObjectReference LG
Services
GetLCBValues
SetLCBValues
14 LOG
The LOG shall be filled on a first-in first-out basis. When the list of log entries reaches a point where the stored
data reaches the maximal size of the log, the oldest log entry shall be overwritten. This action shall have no
impact to the further incrementing of the EntryID of the added log entries.
The LOG shall have the structure defined in Table 27.
Table 27 - LOG class definition
LOG class
Attribute name Attribute type FC Value/value range/explanation
LogName ObjectName Instance name of an instance of LOG
LogRef ObjectReference Path-name of an instance of LOG
OldEntrTm TimeStamp LG
NewEntrTm TimeStamp LG
OldEntr INT32U LG
NewEntr INT32U LG
Entry [1.n]
TimeOfEntry EntryTime
EntryID EntryID
EntryData [1.n]
DataRef ObjectReference
Value (*) (*) type(s) depend on the definition of common data
classes in IEC 61850-7-3
ReasonCode TriggerConditions If reason-for-inclusion (="TRUE)" in optFlds.
ReasonCode general-interrogation shall never
occur as TRUE.
Services
QueryLogByTime
QueryLogAfter
GetLogStatusValues
15 GOOSE-CONTROL-BLOCK (GoCB) class
The GoCB shall be as defined in Table 28.
Table 28 - GOOSE control block class definition
GoCB class
Attribute name Attribute type FC TrgOp Value/value range/explanation
GoCBName ObjectName GO - Instance name of an instance of GoCB
GoCBRef ObjectReference GO - Path-name of an instance of GoCB
GoEna BOOLEAN GO dchg Enabled (TRUE) | disabled (FALSE)
AppID VISIBLE STRING65 GO Attribute that allows a user to assign a
system unique identification for the
application that is issuing the GOOSE.
DEFAULT GoCBRef
DatSet ObjectReference GO dchg
ConfRev INT32U GO dchg
NdsCom BOOLEAN GO dchg
Services
SendGOOSEMessage
GetGoReference
GetGOOSEElementNumber
GetGoCBValues
SetGoCBValues
15 Generic substation state event (GSSE) control block (GsCB)
The GsCB shall be as defined in Table 30.
Table 30 - GSSE control block class definition
GsCB class
Attribute name Attribute type FC Value/value range/explanation
GsCBName ObjectName Instance name of an instance of GsCB
GsCBRef ObjectReference Path-name of an instance of GsCB
GsEna BOOLEAN GS Enabled (TRUE) | disabled (FALSE)
AppID VISIBLE STRING65 GS
DataLabel [1.n] VISIBLE STRING65 GS

LSentData [1.n] GSSEData GS Derived from GSSE message
Services
SendGSSEMessage
GetGsReference
GetGSSEDataOffset
GetGsCBValues
SetGsCBValues
16 Transmission of sampled values using multicast (MSVCB)
The transmission of sampled values using multicast (MULTICAST-SAMPLE-VALUE-CONTROL-BLOCK -
MSVCB) shall be based on configured configuration in the producer device. The data exchange shall be based

on the multicast application association. To support self-descriptive capabilities, any client may read the
attributes of the sampled value control instance. Authorized clients may modify attributes of the sampled value
control.
The MSVCB shall be as defined in Table 32.

Table 32 - MSVCB class definition

MSVCB class
Attribute Attribute type FC TrgOp Value/value range/explanation

name
MsvCBNam ObjectName - - Instance name of an instance of MSVCB

MsvCBRef ObjectReference - - Path-name of an instance of MSVCB
SvEna BOOLEAN MS dchg Enabled (TRUE) | disabled (FALSE), DEFAULT
FALSE
MsvID VISIBLE STRING65 MS -
DatSet ObjectReference MS dchg
ConfRev INT32U MS dchg
SmpRate INT16U MS - (0.MAX)
OptFlds PACKED LIST MS dchg
refresh-time BOOLEAN
sample-synchronized BOOLEAN
sample-rate BOOLEAN
Services
SendMSVMessage
GetMSVCBValues
SetMSVCBValues
16 Transmission of sampled values using unicast (USVCB)
The transmission of sampled values using unicast (UNICAST-SAMPLE-VALUE-CONTROL-BLOCK - USVCB)
shall be based on two-party application associations. The subscriber shall establish the association with the
producer. The subscriber may then configure the class and enable the transmission of the sampled values with
the attribute SvEna. When the association is released, the transmission of the sampled values shall stop and
the instance of the control class shall be released.

The samples shall be sent using the two-party application association.
The USVCB shall be as defined in Table 33.

Table 33 - USVCB class definition

USVCB class
Attribute name Attribute FC TrgOp Value/value range/explanation

UsvCBNam ObjectName - - Instance name of an instance of UNICAST-

SVC
UsvCBRef ObjectReference - - Path-name of an instance of UNIICAST-
SVC
SvEna BOOLEAN US dchg Enabled (TRUE) | disabled (FALSE),
DEFAULT FALSE
Resv BOOLEAN US -
UsvID VISIBLE STRING65 US -
DatSet ObjectReference US dchg
ConfRev INT32U US dchg
SmpRate INT16U US dchg (0.MAX)
OptFlds PACKED LIST US dchg
refresh-time BOOLEAN
sample-synchronized BOOLEAN
sample-rate BOOLEAN
Services
SendUSVMessage
GetUSVCBValues
SetUSVCBValues
All LN classes defined in IEC 61850-7-4

�   The first column (Summary) provides all logical nodes with data

names and explanation only.
�   The second column (IEC) provides almost all information of all

logical nodes as in IEC 61850-7-4

How to view?
If you want to see one of the following logical nodes (available in HTML Format only!!)

together with the Common Data Classes (CDC) AND the Semantic of all names,
with the following three frames:
�   Upper frame: logical node (LN),
�   Middle frame: the common data class (CDC), and
�   Bottom frame: the semantic of the names).
Then navigate through the LNs below (on this page).
Summary IEC
LPHD Summary LPHD IEC Table
CLN Summary CLN IEC Table
LLN0 Summary LLN0 IEC Table
PDIF Summary PDIF IEC Table
PDIR Summary PDIR IEC Table
PDIS Summary PDIS IEC Table
PDOP Summary PDOP IEC Table
PDUP Summary PDUP IEC Table
PFRC Summary PFRC IEC Table
PHAR Summary PHAR IEC Table
PHIZ Summary PHIZ IEC Table
PIOC Summary PIOC IEC Table
PMRI Summary PMRI IEC Table
PMSS Summary PMSS IEC Table
POPF Summary POPF IEC Table
PPAM Summary PPAM IEC Table
PSCH Summary PSCH IEC Table
PSDE Summary PSDE IEC Table
PTEF Summary PTEF IEC Table
PTOC Summary PTOC IEC Table
PTOF Summary PTOF IEC Table
PTOV Summary PTOV IEC Table
PTRC Summary PTRC IEC Table
PTTR Summary PTTR IEC Table
PTUC Summary PTUC IEC Table
PTUV Summary PTUV IEC Table
PUPF Summary PUPF IEC Table
PTUF Summary PTUF IEC Table
PVOC Summary PVOC IEC Table
PVPH Summary PVPH IEC Table
PZSU Summary PZSU IEC Table
RDRE Summary RDRE IEC Table
RADR Summary RADR IEC Table
RBDR Summary RBDR IEC Table
RDRS Summary RDRS IEC Table
RBRF Summary RBRF IEC Table
RDIR Summary RDIR IEC Table
RFLO Summary RFLO IEC Table
RPSB Summary RPSB IEC Table
RREC Summary RREC IEC Table
RSYN Summary RSYN IEC Table
CALH Summary CALH IEC Table
CCGR Summary CCGR IEC Table
CILO Summary CILO IEC Table
CPOW Summary CPOW IEC Table
CSWI Summary CSWI IEC Table
GAPC Summary GAPC IEC Table
GGIO Summary GGIO IEC Table
GSAL Summary GSAL IEC Table
IARC Summary IARC IEC Table
IHMI Summary IHMI IEC Table
ITCI Summary ITCI IEC Table
ITMI Summary ITMI IEC Table
ANCR Summary ANCR IEC Table
ARCO Summary ARCO IEC Table
ATCC Summary ATCC IEC Table
AVCO Summary AVCO IEC Table
MDIF Summary MDIF IEC Table
MHAI Summary MHAI IEC Table
MHAN Summary MHAN IEC Table
MMTR Summary MMTR IEC Table
MMXN Summary MMXN IEC Table
MMXU Summary MMXU IEC Table
MSQI Summary MSQI IEC Table
MSTA Summary MSTA IEC Table
SARC Summary SARC IEC Table
SIMG Summary SIMG IEC Table
SIML Summary SIML IEC Table
SPDC Summary SPDC IEC Table
XCBR Summary XCBR IEC Table
XSWI Summary XSWI IEC Table
TCTR Summary TCTR IEC Table
TVTR Summary TVTR IEC Table
YEFN Summary YEFN IEC Table
YLTC Summary YLTC IEC Table
YPSH Summary YPSH IEC Table
YPTR Summary YPTR IEC Table
ZAXN Summary ZAXN IEC Table
ZBAT Summary ZBAT IEC Table
ZBSH Summary ZBSH IEC Table
ZCAB Summary ZCAB IEC Table
ZCAP Summary ZCAP IEC Table
ZCON Summary ZCON IEC Table
ZGEN Summary ZGEN IEC Table
ZGIL Summary ZGIL IEC Table
ZLIN Summary ZLIN IEC Table
ZMOT Summary ZMOT IEC Table
ZREA Summary ZREA IEC Table
ZRRC Summary ZRRC IEC Table
ZSAR Summary ZSAR IEC Table
ZTCF Summary ZTCF IEC Table
ZTCR Summary ZTCR IEC Table
Logical node classes (LN) of IEC 61850-7-4

Version 2004-03-22
This web page (pdf file) is intended to provide a hypertext version of an excerpt of the main

concepts and definitions of Parts IEC 61850-7-4

NOTE The content of this web page (pdf file) is informative only. The page does in no way

replace the normative definitions contained in IEC 61850-7-4.

Copyright of transformation (c) 2004 by Karlheinz Schwarz, SCC

Send comment to Karlheinz
2004-03-22
Brief tables of LN classes defined in IEC 61850-7-4
(Tables provide just DATA Class Names and Explanation)

LPHD - Physical device information
This LN is introduced in this part to model common issues for physical devices.
LPHD class
DATA Class Explanation
PhyNam
Physical device name plate
PhyHealth
Physical device health
OutOv
Output communications buffer overflow

Proxy
Indicates if this LN is a proxy
InOv
Input communications buffer overflow
NumPwrUp
Number of Power ups
WrmStr
Number of Warm Starts
WacTrg
Number of watchdog device resets detected
PwrUp
Power Up detected
PwrDn
Power Down detected
PwrSupAlm
External power supply alarm
RsStat
Reset device statistics
CLN - Common Logical Node
The compatible logical node classes defined in this document are specilisations of this

Common Logical Node Class.
CLN class
DATA Class Explanation
Mandatory Logical Node Information (Shall be inherited by ALL LN but LPHD)

Mod
Mode
Beh
Behaviour
Health
Health
NamPlt
Name plate
Optional Logical Node Information
Loc
Local operation
EEHealth
External equipment health
EEName
External equipment name plate
OpCntRs
Operation counter resetable
OpCnt
Operation counter
OpTmh
Operation time
Data Sets (see IEC 61850-7-2)
LLN0 - Logical node zero
This logical node shall be used to address common issues for logical devices.

LLN0 class
DATA Class Explanation
Common Logical Node Information
LN shall inherit all Mandatory Data from Common Logical Node Class

Loc
Local operation for complete logical device
OpTmh
Operation time
Controls
Diag
Run Diagnostics
LEDRs
LED reset
PDIF - Differential
See IEC 61850-5 (LNs PLDF, PNDF, PTDF, PBDF, PMDF, and PPDF). This LN shall be

used for all kind of current differential protection. Proper current samples for the dedicated

application shall be subscribed.

PDIF class
DATA Class Explanation
Common Logical Node Information

LN shall inherit all Mandatory Data from Common Logical Node Class

OpCntRs
Resetable operation counter
Status Information
Str
Start
Op
Operate
TmASt
Active curve characteristic
Measured Values
DifAClc
Differential Current
RstA
Restraint Current
Settings
LinCapac
Line capacitance (for load currents)
LoSet
Low operate value, percentage of the nominal current
HiSet
High operate value, percentage of the nominal current
MinOpTmms
Minimum Operate Time
MaxOpTmms
Maximum Operate Time
RstMod
Restraint Mode
RsDlTmms
Reset Delay Time
TmACrv
Operating Curve Type
PDIR - Direction comparison
For a description of this LN, see IEC 61850-5. The operate decision is based on an
agreement of the fault direction signals from all directional fault sensors (for example
directional relays) surrounding the fault. The directional comparison for lines is made with
PSCH.
PDIR class
DATA Class Explanation
Common Logical Node Information

LN shall inherit all Mandatory Data from Common Logical Node Class

OpCntRs
Resetable operation counter
Status Information
Str
Start (appearance of the first related fault direction)

Op
Operate (decision from all sensors that the surrounded object is faulted)

Settings
RsDlTmms
Reset Delay Time
PDIS - Distance
For a description of this LN, see IEC 61850-5. The phase start value and ground start value
are minimum thresholds to release the impedance measurements depending on the distance
function characteristic given by the algorithm and defined by the settings. The settings
replace the data curve as used for the characteristic on some other protection LNs.
PDIS class
DATA Class Explanation
Common Logical Node Information
LN shall inherit all Mandatory Data from Common Logical Node Class

OpCntRs
Resetable operation counter
Status Information
Str
Start
Op
Operate
Settings
PoRch
Polar Reach is the diameter of the Mho diagram

PhStr
Phase Start Value
GndStr
Ground Start Value
DirMod
Directional Mode
PctRch
Percent Reach
Ofs
Offset
PctOfs
Percent Offset
RisLod
Resistive reach for load area
AngLod
Angle for load area
TmDlMod
Operate Time Delay Mode
OpDlTmms
Operate Time Delay
PhDlMod
Operate Time Delay Multiphase Mode

PhDlTmms
Operate Time Delay for Multiphase Faults

GndDlMod
Operate Time Delay for Single Phase Ground Mode

GndDlTmms
Operate Time Delay for single phase ground faults

X1
Positive sequence line (reach) reactance

LinAng
Line Angle
RisGndRch
Resistive Ground Reach
RisPhRch
Resistive Phase Reach
K0Fact
Residual Compensation Factor K0
K0FactAng
Residual Compensation Factor Angle
RsDlTmms
Reset Time Delay
PDOP - Directional overpower
For a description of this LN, see IEC 61850-5 (LN PDPR). This LN shall be used for the
overpower part of PDPR. Additionally, PDOP is used to model a reverse overpower function
(IEEE device function number 32R, from IEEE 32R.2,1996) when the DirMod is set to
reverse.
PDOP class
DATA Class Explanation
Common Logical Node Information
LN shall inherit all Mandatory Data from Common Logical Node Class

OpCntRs
Resetable operation counter
Status Information
Str
Start
Op
Operate
Settings
DirMod
Directional Mode
StrVal
Start Value
OpDlTmms
Operate Delay Time
RsDlTmms
Reset Delay Time
PDUP - Directional underpower
For a description of this LN, see IEC 61850-5 (LN PDPR). This LN shall be used for the

underpower part of PDPR.
PDUP class
DATA Class Explanation
Common Logical Node Information

LN shall inherit all Mandatory Data from Common Logical Node Class

OpCntRs
Resetable operation counter
Status Information
Str
Start
Op
Operate
Settings
StrVal
Start Value
OpDlTmms
Operate Delay Time
RsDlTmms
Reset Delay Time
DirMod
Directional Mode
PFRC - Rate of change of frequency
For a description of this LN, see IEC 61850-5 (LN PFRQ). This LN shall be used to model the
rate of frequency change of PFRQ. One instance shall be used per stage.
PFRC class
DATA Class Explanation
Common Logical Node Information

LN shall inherit all Mandatory Data from Common Logical Node Class

OpCntRs
Resetable operation counter
Status Information
Str
Start
Op
Operate
BlkV
Blocked because of voltage
Settings
StrVal
Start Value df/dt
BlkVal
Voltage Block Value
OpDlTmms
Operate Delay Time
RsDlTmms
Reset Delay Time
PHAR - Harmonic restraint
This LN shall be used to represent the harmonic restraint data of the transformer differential

protection (see PDIF) in a dedicated node. There may be multiple instantiations of this LN
...