IEC 61970-405:2007

IEC 61970-405
Edition 1.0 2007-08
INTERNATIONAL
STANDARD
Energy management system application program interface (EMS-API) –
Part 405: Generic Eventing and Subscription (GES)

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IEC 61970-405
Edition 1.0 2007-08
INTERNATIONAL
STANDARD
Energy management system application program interface (EMS-API) –
Part 405: Generic Eventing and Subscription (GES)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 33.200 ISBN 2-8318-9252-X
– 2 – 61970-405 © IEC:2007(E)
CONTENTS
FOREWORD.4

INTRODUCTION.6

1 Scope.7

2 Normative references .8

3 Terms and definitions .8

4 Generic Eventing and Subscription (Normative).8

4.1 Overview .8
4.1.1 General .8
4.1.2 Suitability of the GES to the integration of a variety of application
categories .9
4.1.3 Suitability of the GES to the integration beyond the control center.9
4.1.4 Suitability of the GES to the integration of tightly coupled and loosely
coupled applications (informative) .10
4.2 Using GES A&E Simple Eventing for Generic Messaging .12
4.2.1 General .12
4.2.2 GES messages.12
4.2.3 Eventing and Subscription topic trees (informative) .13
4.2.4 Subscription filtering.13
4.2.5 GES Publish/Subscribe wildcards .13
4.2.6 Browsing IECTC57 namespaces with GES .14
5 Generic Event Subscription Alarms and Events .16
5.1 Background (informative) .16
5.2 SCADA use case (informative) .16
5.3 Data model (normative) .17
5.4 Messages (normative) .19
5.5 Interface (normative) .21
5.5.1 Objects and interfaces.21
5.5.2 Server and Session interfaces .24
5.5.3 Browse interfaces.24
5.5.4 Client interfaces .26
5.5.5 Mapping DAIS A&E to IEC 61970-3XX series .26

Annex A (informative) Proxy Event Subscription sequence .27

Bibliography.30

Figure 1 – Data subscription .9
Figure 2 – Component architecture .11
Figure 3 – Populated namespace example for IECTC57PhysicalModel (informative).14
Figure 4 – Typical SCADA flows of DAIS alarms and events .16
Figure 5 – GES A&E data model .18
Figure 6 – Event messages.20
Figure 7 – GES A&E objects and interfaces .22
Figure 8 – Typical interaction between the DAIS A&E objects .24

61970-405 © IEC:2007(E) – 3 –
Figure A.1 – Proxy subscription and callback sequence with multiple servers .27

Figure A.2 – Proxy subscription sequence with multiple clients .28

Figure A.3 – Proxy callback sequence with multiple servers.28

Figure A.4 – Proxy callback sequence with multiple clients .29

– 4 – 61970-405 © IEC:2007(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

______________
ENERGY MANAGEMENT SYSTEM
APPLICATION PROGRAM INTERFACE (EMS-API) –

Part 405: Generic Eventing and Subscription (GES)

FOREWORD
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International Standard IEC 61970-405 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
57/888/FDIS 57/907/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.
A list of all parts of the IEC 61970 series, under the general title Energy Management System
Application Program Interface (EMS-API), can be found on the IEC website.

61970-405 © IEC:2007(E) – 5 –
The committee has decided that the contents of this publication will remain unchanged until

the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

the data related to the specific publication. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or

• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – 61970-405 © IEC:2007(E)
INTRODUCTION
This part of IEC 61970 is part of the IEC 61970 series that defines Application Program

Interfaces (APIs) for an Energy Management System (EMS). The IEC 61970-4XX and

IEC 61970-5XX series documents comprise Component Interface Specifications (CISs). The

IEC 61970-4XX series CIS are specified as Platform Independent Models (PIMs), which

means they are independent of the underlying technology used to implement them. PIM

specifications are also referred to as Level 1 specifications. The IEC 61970-5XX series CIS,

on the other hand, are specified as Platform Specific Models (PSMs). PSM specifications are

also referred to as Level 2 specifications.

IEC 61970-4XX CISs specify the functional requirements for interfaces that a component (or
application) should implement to exchange information with other components (or
applications) and/or to access publicly available data in a standard way. The component
interfaces describe the specific event types and message contents that can be used by
applications for this purpose.
IEC 61970-405 specifies an interface for the efficient transfer of event messages and alarm
acknowledge messages in a distributed environment. Small numbers of messages are
transferred with short delay but also large amounts are transferred in short time but with
possibly longer delay. This is a typical requirement for a SCADA system that acts as a real
time data provider to other sub-systems. Other systems than SCADA may also benefit from
the characteristics of Generic Eventing and Subscription (GES) interface. When short delay
times as well as bulk message transfer is required, GES is a good fit.
The component interface specifications refer to entity objects for the power system domain
that is defined in the IEC 61970-3XX series, including IEC 61970-301.

61970-405 © IEC:2007(E) – 7 –
ENERGY MANAGEMENT SYSTEM
APPLICATION PROGRAM INTERFACE (EMS-API) –

Part 405: Generic Eventing and Subscription (GES)

1 Scope
The IEC 61970-405 Generic Eventing and Subscription (GES) specification specifies a
...