EN 61970-407:2007

SLOVENSKI STANDARD
01-januar-2008
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Energy management system application program interface (EMS-API) -- Part 407: Time
Series Data Access (TSDA)
Schnittstelle für Anwendungsprogramme für Energiemanagementsysteme (EMS-API) --
Teil 407: Zugriff auf Daten, die auf Zeitfolgen beruhen (TSDA)
Interface de programmation d'application pour système de gestion d'énergie (EMS-API) -
- Partie 407: Accès aux données en série chronologique (TSDA)
Ta slovenski standard je istoveten z: EN 61970-407:2007
ICS:
29.240.30 Krmilna oprema za Control equipment for electric
elektroenergetske sisteme power systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61970-407
NORME EUROPÉENNE
September 2007
EUROPÄISCHE NORM
ICS 33.200
English version
Energy management system application program interface (EMS-API) -
Part 407: Time Series Data Access (TSDA)
(IEC 61970-407:2007)
Interface de programmation d'application Schnittstelle für Anwendungsprogramme
pour système de gestion d'énergie für Energiemanagementsysteme
(EMS-API) - (EMS-API) -
Partie 407: Accès aux données Teil 407: Zugriff auf Daten,
en série chronologique (TSDA) die auf Zeitfolgen beruhen (TSDA)
(CEI 61970-407:2007) (IEC 61970-407:2007)

This European Standard was approved by CENELEC on 2007-09-01. 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.

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Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

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

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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61970-407:2007 E
Foreword
The text of document 57/889/FDIS, future edition 1 of IEC 61970-407, 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 61970-407 on 2007-09-01.
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) 2008-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61970-407:2007 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 61970-407:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
1) 2)
IEC 61970-1 – Energy management system application EN 61970-1 2006
program interface (EMS-API) -
Part 1: Guidelines and general requirements

1) 2)
IEC/TS 61970-2 – Energy management system application CLC/TS 61970-2 2005
program interface (EMS-API) -
Part 2: Glossary
IEC 61970-301 2003 Energy management system application EN 61970-301 2004
program interface (EMS-API) -
Part 301: Common Information Model (CIM)
Base
1)
IEC/TS 61970-401 – Energy management system application – –
program interface (EMS-API) -
Part 401: Component interface specification
(CIS) framework
3)
IEC 61970-402 – Energy management system application – –
program interface (EMS-API) -
Part 402: Component Interface Specification
(CIS) - Common services
OMG HDAIS 2003 Historical Data Access from Industrial – –
Systems (HDAIS)
OMG DAF 2002 Utility Management System (UMS) Data – –
Access Facility (DAF)
OMG DAIS 2002 Data Acquisition from Industrial Systems – –
(DAIS)
OPC HDA 2003 OPC Historical Data Access Custom – –
Interface Specification
1)
Undated reference.
2)
Valid edition at date of issue.
3)
At draft stage.
IEC 61970-407
Edition 1.0 2007-08
INTERNATIONAL
STANDARD
Energy management system application program interface (EMS-API) –
Part 407: Time Series Data Access (TSDA)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
S
ICS 33.200 ISBN 2-8318-9253-8
– 2 – 61970-407 © IEC:2007(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope.6
2 Normative references .7
3 Terms, definitions and identification conventions .7
3.1 Terms and definitions .7
3.2 Conventions .7
4 CIS Specification.7
4.1 Background (informative) .7
4.2 Historian use case (informative) .8
4.3 Data model.10
4.4 Messages (normative) .13
4.5 Interface (normative) .13
4.5.1 Objects and interfaces.13
4.5.2 Server and Session interfaces .16
4.5.3 Management interfaces .17
4.5.4 Browse interfaces.17
4.5.5 IO interfaces.18
4.5.6 Client interfaces .20
4.6 Mapping of TSDA .20

Figure 1 – Control system structure .9
Figure 2 – TSDA server and clients.10
Figure 3 – Data subscription .10
Figure 4 – TSDA data model.11
Figure 5 – TSDA objects and interfaces .14
Figure 6 – Typical Interaction between the TSDA objects.16

61970-407 © IEC:2007(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ENERGY MANAGEMENT SYSTEM
APPLICATION PROGRAM INTERFACE (EMS-API) –

Part 407: Time Series Data Access (TSDA)

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 61970-407 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
57/889/FDIS 57/908/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.

– 4 – 61970-407 © IEC:2007(E)
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.

61970-407 © IEC:2007(E) – 5 –
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 61970-407 specifies an interface for the efficient transfer of time series data in a
distributed environment. Small amounts of data are transferred with short delay but also large
amounts of data are transferred in short time but with possibly longer delay. Replay of time
series data is also supported. 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 TSDA. When short delay times as well as bulk data transfer is
required TSDA is a good fit.
These 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.

– 6 – 61970-407 © IEC:2007(E)
ENERGY MANAGEMENT SYSTEM
APPLICATION PROGRAM INTERFACE (EMS-API) –

Part 407: Time Series Data Access (TSDA)

1 Scope
The IEC 61970-407 Time Series Data Access (TSDA) specification specifies a generalized
interface for efficient exchange of data. The specification takes into account the latencies
caused by a Local Area Network (LAN) providing efficient data exchange also over Local Area
Networks.
IEC 61970-407 is derived from the Object Management Group (OMG) Historical Data Access
from Industrial Systems (HDAIS) specification. OMG HDAIS relies on the OMG Data Access
Facility (DAF) and OPC Historical Data Access (HDA) specifications. OMG HDAIS is a
Platform Specific Model (PSM) with CORBA as the platform and OPC HDA is a PSM with
Microsoft COM as the platform. The IEC 61970-407 specification describes the functionality of
these PSMs in a technology independent way (i.e., as a Platform Independent Model (PIM)).
Hence, it explains the functionality to a level that can be used to create additional PSMs or be
an introduction to existing PSMs, i.e. HDAIS and OPC HDA. Implementers wanting an
introduction to OMG HDAIS and OPC HDA should read these documents.
The TSDA interface is intended to interoperate with other IEC 61970 based interfaces. Hence,
it is possible to use information retrieved from other interface to access the same information
using this interface, for example:
• object identifiers,
• attribute names or identifiers,
• class names or identifiers.
Subclause 4.6 provides a generic mapping for the CIM classes and attributes.
The way data is organized in a server implementing the TSDA interface can be seen by using
the browse interfaces for data and meta data. It is also possible to use the data access
interface directly without using the browse interfaces if the client has an a priori knowledge of
object, class and attribute identifiers. Object identifiers may be retrieved using data from other
interfaces, for example a CIMXML file or the IEC 61970-404 interface. Information on what
classes and attributes are available will be described in IEC 61970-45X documents, for
example historical SCADA data, historical State Estimator results etc.
IEC 61970-1 provides the EMS-API reference model upon which this standard is based. In
that reference model, the terminology used in this part of IEC 61970 is introduced and the role
of the CIS is explained.
IEC 61970-401 provides an overview and framework for the CIS (IEC 61970-4XX) standards.
The mapping of IEC 61970-407 to implementation specific technologies or PSMs is further
described in a separate series of documents, i.e. the future IEC 61970-5XX. For actual
implementations the future IEC 61970-5XX, OMG HDAIS, OMG DAF or OPC HDA are used.

61970-407 © IEC:2007(E) – 7 –
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 61970-1, Energy management system application program interface (EMS-API) – Part 1:
Guidelines and general requirements
IEC/TS 61970-2, Energy management system application program interface (EMS-API) –
Part 2: Glossary
IEC 61970-301:2005, Energy management system application program interface (EMS-API) –
Part 301: Common Information Model (CIM) base
IEC 61970-401, Energy management system application program interface (EMS-API) –
Part 401: Component Interface Specification (CIS) Framework
IEC 61970-402, Energy management system application program interface (EMS-API) –
Part 402: Component Interface Specification (CIS) - Common Services
Historical Data Access from Industrial Systems (HDAIS), OMG Adopted Specification Version
1.0, dtc/2003-02-01 November 2003 (Referred herein as 'OMG HDAIS')
Utility Management System (UMS) Data Access Facility (DAF), OMG Adopted Specification,
Version 2.0, formal/02-11-08, November 2002 (Referred to herein as ‘OMG DAF’)
Data Acquisition from Industrial Systems (DAIS), OMG Adopted Specification Version 1.0,
formal/2002-11-07 November 2002 (Referred herein as 'OMG DAIS')
OPC Historical Data Access Custom Interface Specification, Version 1.20, OPC Foundation,
December 2003 (Referred to herein as ‘OPC HDA’)
3 Terms, definitions and identification conventions
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61970-2 apply.
3.2 Conventions
A convention used in this document to uniquely identify a UML attribute is to concatenate the
class name and the attribute name with a period in between, for example, the attribute “id” in
the class “Node” will then be named “Node.id”. For attributes in sub structures multiple
attribute names may be used, for example “Item.id.node_id” where the “node_id” is a part in
the structure “Item.id”.
4 CIS Specification
4.1 Background (informative)
For historical reasons, control systems for different industrial processes have evolved along
different lines. Control systems for power systems have evolved on a UNIX base and control
systems for most other industrial processes have evolved on a Windows base. For Windows
based control systems, OPC has become the dominating standard. For UNIX based systems,
the DAIS/HDAIS API defined in Common Object Request Broker Architecture (CORBA)

– 8 – 61970-407 © IEC:2007(E)
Interface Definition Language (IDL) has been developed. DAIS/HDAIS is based on OPC to
benefit from the success of OPC and enable easy bridging to OPC. With this intent Object
Management Group (OMG) started in 1997 to develop a CORBA based interface with the
same functionality as OPC. TSDA has the functionality from OMG HDAIS and OPC HDA
described in a technology neutral way, hence TSDA is intended to be a Platform Independent
Model (PIM).
4.2 Historian use case (informative)
An important component in a utility operational system is a Historian or Utility Data
Warehouse (UDW) that acts as a repository for past or future time series data. A UDW acts as
a server to client components. Such a system typically has the following components:
• Process instrumentation making sensor data and actuation capabilities available.
• Remote Terminal Units (RTUs) or substation control systems reading sensor data and
controlling actuators.
• Process communication units connecting to RTUs or substation control systems. Remote
communication is typically solved by specialized RTU or field bus protocols (e.g.
IEC 60870-5). The IEC 61850 is a new standard for communication with and within
substations. The interfaces defined in this specification can be used as a standard API to
encapsulate such communication solutions at the client side.
• SCADA subsystem making processed sensor data and control capabilities available to
operators, applications or other systems.
• A Model based management system, for example Energy Management System (EMS),
using the SCADA subsystem for extended processing and control.
• A Graphical User Interface (GUI).
• UDW that stores time series data.
Figure 1 below.
The architecture is shown in
61970-407 © IEC:2007(E) – 9 –
Data
traffic
across
TSDA clients
TSDA
API
Graphical User
Interface
Model based management
system (e.g. EMS)
Data
traffic
SCADA or
Historian or Data Warehouse
across
Telemetry system
(TSDA server)
HSDA
API
Process
Communication
Units
Process control
substation control
or RTU
Instrumentation
IEC  1334/07
Figure 1 – Control system structure
A UDW and possible clients using it are shown in Figure 2:
• Data sources recording data as the SCADA recording real time data, EMS recording
calculation results or GUI recording manually entered data.
• A Process Communication Unit providing time series data from remote sources.
• Clients, for example a GUI, retrieving data for discovery, presentation and
updates/corrections.
• Clients, for example analysis programs, retrieving data for analysis and or input to
calculations
• A UDW typically also has calculations that create new results from already stored time
series data.
– 10 – 61970-407 © IEC:2007(E)
Archive
Calculation
Utility Data Server
of new data
Warehouse
Communication supported by API
Data source
Discovery Presentation Update Analysis
(recording)
Clients
IEC  1335/07
Figure 2 – TSDA server and clients
TSDA supports both subscription and read/write operations. The concept of subscription is
described in Figure 3.
Client
Establish
Callbacks for
subscription
data transfer
Server or
Data provider
IEC  1336/07
Figure 3 – Data subscription
A subscription involves a server that publishes data and clients that subscribe to receive the
data. The server has no a priori knowledge of its clients; they become known to the server
when a client creates a subscription. Once a subscription is established, the server calls the
client back when data becomes available or is updated.
4.3 Data model
The TSDA data model describes how data seen through the TSDA interface appears to be
organized within a server. A server implementation may organize data differently, but a client
using TSDA will see a data model as shown in Figure 4.

61970-407 © IEC:2007(E) – 11 –
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