EN 60870-6-503:2002

SLOVENSKI STANDARD
01-maj-2004
1DGRPHãþD
SIST EN 60870-6-503:2000
2SUHPDLQVLVWHPL]DGDOMLQVNRYRGHQMHGHO3URWRNROLGDOMLQVNHJDYRGHQMD
NLVR]GUXåOMLYLVVWDQGDUGL,62LQSULSRURþLOL,7876WRULWYHLQSURWRNRO7$6(
,(&
Telecontrol equipment and systems -- Part 6-503: Telecontrol protocols compatible with
ISO standards and ITU-T recommendations - TASE.2 Services and protocol
Fernwirkeinrichtungen und -systeme -- Teil 6-503: Fernwirkprotokolle, die mit ISO-
Normen und ITU-T-Empfehlungen kompatibel sind - TASE.2-Dienste und -Protokoll
Matériels et systèmes de téléconduite -- Partie 6-503: Protocoles de téléconduite
compatibles avec les normes ISO et les recommandations de l'UIT-T - Services et
protocole TASE.2
Ta slovenski standard je istoveten z: EN 60870-6-503:2002
ICS:
33.200 Daljinsko krmiljenje, daljinske Telecontrol. Telemetering
meritve (telemetrija)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60870-6-503
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2002
ICS 33.200 Supersedes EN 60870-6-503:1997
English version
Telecontrol equipment and systems
Part 6-503: Telecontrol protocols compatible with ISO standards
and ITU-T recommendations -
TASE.2 Services and protocol
(IEC 60870-6-503:2002)
Matériels et systèmes de téléconduite Fernwirkeinrichtungen und -systeme
Partie 6-503: Protocoles de téléconduite Teil 6-503: Fernwirkprotokolle,
compatibles avec les normes ISO die mit ISO-Normen und
et les recommandations de l'UIT-T - ITU-T-Empfehlungen kompatibel sind -
Services et protocole TASE.2 TASE.2-Dienste und -Protokoll
(CEI 60870-6-503:2002) (IEC 60870-6-503:2002)
This European Standard was approved by CENELEC on 2002-05-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60870-6-503:2002 E

Foreword
The text of document 57/574/FDIS, future edition 2 of IEC 60870-6-503, prepared by IEC TC 57, Power
system control and associated communications, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 60870-6-503 on 2002-05-01.
This European Standard supersedes EN 60870-6-503:1997.
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) 2003-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-05-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annexes A, B and ZA are normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60870-6-503:2002 was approved by CENELEC as a
European Standard without any modification.
__________
- 3 - EN 60870-6-503:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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
IEC 60870-6-702 1998 Telecontrol equipment and systems EN 60870-6-702 1998
Part 6-702: Telecontrol protocols
compatible with ISO standards and ITU-
T recommendations - Functional profile
for providing the TASE.2 application
service in end systems
IEC 60870-6-802 2002 Part 6-802: Telecontrol protocols EN 60870-6-802 2002
compatible with ISO standards and ITU-
T recommendations - TASE.2 Object
models
1)
ISO/IEC 8073 - Information technology - Open systems--
interconnection - Protocol for providing
the connection-mode transport service
ISO/IEC 8208 2000 Information technology - Data --
communications - X.25 Packet Layer
Protocol for Data Terminal Equipment
ISO/IEC 8473 Series Information technology - Protocol for--
providing the connectionless-mode
network service
ISO/IEC 8802-3 2001 Information technology - --
Telecommunications and information
exchange between systems - Local and
metropolitan area networks - Specific
requirements
Part 3: Carrier sense multiple access
with collision detection (CSMA/CD)
access method and physical layer
specifications
ISO 9506-1 2000 Industrial automation systems - --
Manufacturing Message Specification
Part 1: Service definition
1)
Undated reference.
Publication Year Title EN/HD Year
ISO 9506-2 2000 Part 2: Protocol specification - -
1)
ISO/IEC 9542 - Information processing systems - --
Telecommunications and information
exchange between systems - End
system to intermediate system routing
exchange protocol for use in conjunction
with the Protocol for providing the
connectionless-mode network service
(ISO 8473)
ISO/IEC 10589 1992 Information technology - --
Telecommunications and information
exchange between systems -
Intermediate system to intermediate
system intra-domain-routing exchange
protocol for use in conjunction with the
protocol for providing the
connectionless-mode network Service
(ISO 8473)
ISO/IEC ISP 1992 Information technology - International--
10608-1 Standardized Profile TAnnnn -
Connection-mode Transport Service
over Connectionless-mode Network
Service
Part 1: General overview and
subnetwork-independent requirements
ISO/IEC ISP 1992 Part 2: TA51 profile including --
10608-2 subnetwork-dependent requirements for
CSMA/CD Local Area Networks (LANs)
ISO/IEC ISP 1992 Part 5: TA1111/TA1121 profiles --
10608-5 including subnetwork-dependent
requirements for X.25 packet-switched
data networks using virtual calls
ISO/IEC ISP 1994 Information technology - International--
10613-1 Standardized Profile RA - Relaying the
Connectionless-mode Network Service
Part 1: Subnetwork-independent
requirements
ISO/IEC ISP 1994 Part 2: LAN Subnetwork-dependent,--
10613-2 media-independent requirements
ISO/IEC ISP 1994 Part 3: CSMA/CD LAN subnetwork---
10613-3 dependent, media-dependent
requirements
ISO/IEC ISP 1994 Part 5: Definition of profile RA51.51,--
10613-5 relaying the Connectionless-mode
Network Service between CSMA/CD
LAN subnetworks
- 5 - EN 60870-6-503:2002
Publication Year Title EN/HD Year
ISO/IEC ISP 1994 Part 7: PSDN subnetwork-dependent,--
10613-7 media-dependent requirements for
virtual calls over a permanent access
ISO/IEC ISP 1994 Part 8: Definition of profile RA51.1111,--
10613-8 relaying the Connectionless-mode
Network Service between CSMA/CD
LAN subnetworks and PSDNs using
virtual calls over a PSTN leased line
permanent access
ISO/IEC ISP 1994 Part 9: Definition of profile RA51.1121,--
10613-9 relaying the Connectionless-mode
Network Service between CSMA/CD
LAN subnetworks and PSDNs using
virtual calls over a digital data
circuit/CSDN leased line permanent
access
1)
ISO/IEC 8649 - Information technology - Open systems--
interconnection - Service definition for
the Association Control Service Element
(ACSE)
INTERNATIONAL IEC
STANDARD
60870-6-503
Second edition
2002-04
Telecontrol equipment and systems –
Part 6-503:
Telecontrol protocols compatible with
ISO standards and ITU-T recommendations –
TASE.2 Services and protocol
Matériels et systèmes de téléconduite –
Partie 6-503:
Protocoles de téléconduite compatibles avec les
normes ISO et les recommandations de l'UIT-T –
Services et protocole TASE.2
 IEC 2002  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XF
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60870-6-503  IEC:2002(E)
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
1.1 Control centre.8
1.2 Architecture.9
1.3 Network Model.10
1.4 Relation between TASE.2 and MMS.10
2 Normative references.11
3 Definitions .13
4 Abbreviations.15
5 TASE.2 Model.15
5.1 Informal TASE.2 Model Description.15
5.1.1 Associations .17
5.1.2 Bilateral Agreements, Bilateral Tables and Access Control .18
5.1.3 Data Value Objects and Services .20
5.1.4 Data Set Objects and Services.20
5.1.5 Account Objects and Services.20
5.1.6 Information Message Object and Services.20
5.1.7 Transfer Set Objects and Services .21
5.1.8 Common Data Transfer Mechanisms .23
5.1.9 Special Transfer Objects and Services.24
5.1.10 Device Objects and Services.24
5.1.11 Program Objects and Services .25
5.1.12 Event Enrollment Objects and Services .26
5.1.13 Event Condition Objects and Services.26
5.2 Formal TASE.2 Model Description .26
5.2.1 General Access Control Requirements .29
5.2.2 Association Management .29
5.2.3 Bilateral Tables.31
5.2.4 List of Access Control Specification .32
5.2.5 Data Values .33
5.2.6 Data Sets .34
5.2.7 Accounts .36
5.2.8 Information Messages.36
5.2.9 Transfer Sets.37
5.2.10 Special Transfer Objects.45
5.2.11 Devices .46
5.2.12 Programs.48
5.2.13 Event Enrollments.49
5.2.14 Event Conditions.49
6 Mapping of TASE.2 Object Models onto MMS Object Models.50
6.1 Object Modelling Notation (Informative) .50
6.2 The Virtual Control Centre (VCC).51
6.2.1 TASE.2 Domain Mapping .51
6.2.2 TASE.2 Control Centre Mapping .52
6.2.3 OSI Application Processes, Application Entities and Presentation
Addresses .52

60870-6-503 © IEC:2002(E) – 3 –
6.3 Association Object Model Mapping.52
6.4 Bilateral Table Object Model Mapping .53
6.5 Data Value Object Model Mapping .55
6.6 Data Set Object Model Mapping.55
6.7 Account Object Model Mapping.56
6.8 Information Message Object Model Mapping .56
6.9 Transfer Set Object Model Mapping .57
6.9.1 Data Set Transfer Set Object Model Mapping .57
6.9.2 Time Series Transfer Set Object Model Mapping.59
6.9.3 Transfer Account Transfer Set Object Model Mapping .60
6.9.4 Information Message Transfer Set Object Model Mapping .61
6.10 Next Transfer Set Object Model Mapping .61
6.11 Transfer Set Name Object Model Mapping .62
6.12 Conditions Object Model Mapping .62
6.13 Event Code Object Model Mapping .62
6.14 Transfer Set Time Stamp Object Model Mapping.62
6.15 Device Object Model Mapping.63
6.16 Program Object Model Mapping .63
6.17 Event Enrollment Object Model Mapping .64
6.18 Event Condition Object Model Mapping .64
7 Mapping of TASE.2 Operations and Actions onto MMS Services.65
7.1 Use of MMS Services .66
7.1.1 Association Management Mapping to MMS .67
7.1.2 Data Value Operations Mapping to MMS .70
7.1.3 Data Set Operations Mapping to MMS.73
7.1.4 Transfer Set Operations and Actions Mapping to MMS .80
7.1.5 Account Operations and Actions Mapping .92
7.1.6 Device Operations and Actions Mapping to MMS.93
7.1.7 Program Operations Mapping to MMS .99
7.1.8 Event Enrollment Operations Mapping to MMS . 104
7.1.9 Event Condition Actions Mapping onto MMS. 106
7.1.10 Summary of TASE.2 Operations. 107
8 Standardized Application-specific Objects . 109
8.1 Named Type Objects . 109
8.1.1 Visible-String-32 Type. 109
8.1.2 MMS ObjectName. 109
8.1.3 Time Stamp Types. 110
8.1.4 TimeStampExtended Type . 110
8.1.5 Time Interval Types . 111
8.1.6 TransferSet Types . 111
8.1.7 Conditions Types . 113
8.1.8 SupportedFeatures Type. 114
8.1.9 TASE.2Version Type. 114
8.2 Named Variable Objects . 115
8.2.1 "Supported_Features". 115
8.2.2 "Bilateral_Table_ID". 115
8.2.3 "TASE.2_Version". 115
8.2.4 Data Value Objects . 115
8.2.5 Transfer Set Objects. 116

– 4 – 60870-6-503  IEC:2002(E)
8.2.6 "Next_DSTransfer_Set". 116
8.2.7 "Next_TSTransfer_Set". 116
8.2.8 "Transfer_Set_Name" . 116
8.2.9 "TA_Transfer_Set". 116
8.2.10 "IM_Transfer_Set" . 116
8.2.11 "DSConditions_Detected". 117
8.2.12 "TSConditions_Detected" . 117
8.2.13 "TAConditions_Detected" . 117
8.2.14 "Event_Code_Detected". 117
8.2.15 "Transfer_Set_Time_Stamp". 117
8.2.16 "Transfer_Report_ACK" . 117
8.2.17 "Transfer_Report_NACK". 118
8.3 Named Variable List Objects. 118
8.4 Information Message Objects. 118
8.5 Event Condition Objects . 118
9 Conformance. 119
9.1 Allowable Subsets . 119
9.2 PICS . 120
9.3 MMS Services Required. 124
Annex A (normative)  TASE.2 Operations and Actions Summary. 125
Annex B (normative) Quality of Service (QOS), Routing and Priority. 127
Figure 1 – Protocol relationships .9
Figure 2 – Router-based WAN.10
Figure 3 – Mesh network .10
Figure 4 – Informal TASE.2 Model.17
Figure 5 – Transfer Reporting Mechanism .22
Figure 6 – Relationship between TASE.2 and Real Control Centres .27
Figure 7 – TASE.2 server components .66
Figure 8 – TASE.2 Server Association Control Components.67
Figure 9 – Data Value operations .70
Figure 10 – Sequence of Get Data Value.71
Figure 11 – Data Set operations .74
Figure 12 – Sequence of Create Data Set.76
Figure 13 – Sequence of Delete Data Set .77
Figure 14 – Transfer Set services.81
Figure 15 – Sequence of Transfer Set operations and actions.90
Figure 16 – Device operations .94
Figure 17 – Sequence of Device Control.95
Figure 18 – Server Program Components . 100
Figure 19 – Sequence of Program Invocation operations . 104
Table 1 – Scope of the object models in the VCC .28
Table 2 – Summary of TASE.2 Operations. 107

60870-6-503 © IEC:2002(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
TELECONTROL EQUIPMENT AND SYSTEMS –
Part 6-503: Telecontrol protocols compatible with
ISO standards and ITU-T recommendations –
TASE.2 Services and protocol
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, 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 organizations liaising
with the IEC also participate in this preparation. The 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 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 60870-6-503 has been prepared by IEC technical committee 57:
Power system control and associated communications.
This second edition cancels and replaces the first edition published in 1997 and constitutes
a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
57/574/FDIS 57/582/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.
Annexes A and B form an integral part of this standard.

– 6 – 60870-6-503  IEC:2002(E)
The committee has decided that the contents of this publication will remain unchanged until 2004.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60870-6-503 © IEC:2002(E) – 7 –
INTRODUCTION
The Telecontrol Application Service Element (TASE.2) protocol (also known as Inter-Control
Centre Communications Protocol, ICCP) allows for data exchange over Wide Area Networks
(WANs) between a utility control centre and other control centres, other utilities, power pools,
regional control centres, and Non-Utility Generators. Data exchange information consists of
real-time and historical power system monitoring and control data, including measured values,
scheduling data, energy accounting data, and operator messages. This data exchange occurs
between one control centre's Supervisory Control And Data Acquisition/Energy Management
System/Distribution Management System (SCADA/EMS/DMS) host and another centre's host,
often through one or more intervening communications processors.
This part of IEC 60870 defines a mechanism for exchanging time-critical data between control
centres. In addition, it provides support for device control, general messaging and control of
programs at a remote control centre. It defines a standardized method of using the ISO 9506
Manufacturing Message Specification (MMS) services to implement the exchange of data.
The definition of TASE.2 consists of three documents. This part of IEC 60870 defines the
TASE.2 application modelling and service definitions. IEC 60870-6-702 defines the appli-
cation profile for use with TASE.2. IEC 60870-6-802 defines a set of standardized object
definitions to be supported.
The TASE.2 describes real control centres with respect to their external visible data and
behaviour using an object oriented approach. The objects are abstract in nature and may be
used in a wide variety of applications. The use of TASE.2 goes far beyond the application in the
control centre to control centre communications. This standard must be understood as a tool
box for any application domain with comparable requirements. i.e. the TASE.2 may be applied
in areas like substation automation, power plants, factory automation, chemical plants, or
others which have comparable requirements. It provides a generic solution for advanced
Information and Communication Technology.
The TASE.2 version number for this standard is 2001-08. See 8.2.3 for more details.

– 8 – 60870-6-503  IEC:2002(E)
TELECONTROL EQUIPMENT AND SYSTEMS –
Part 6-503: Telecontrol protocols compatible with
ISO standards and ITU-T recommendations –
TASE.2 Services and protocol
1 Scope
This part of IEC 60870 specifies a method of exchanging time-critical control centre data
through wide-area and local-area networks using a full ISO compliant protocol stack. It
contains provisions for supporting both centralized and distributed architectures. This standard
includes the exchange of real-time data indications, control operations, time-series data,
scheduling and accounting information, remote program control and event notification.
Though the primary objective of TASE.2 is to provide control centre (telecontrol) data
exchange, its use is not restricted to control centre data exchange. It may be applied in any
other domain having comparable requirements. Examples of such domains are power plants,
factory automation, process control automation, and others.
This standard does not specify individual implementations or products, nor does it constrain the
implementation of entities and interfaces within a computer system. This standard specifies the
externally visible functionality of implementations together with conformance requirements for
such functionalities.
1.1 Control centre
The model of a control centre includes four primary classes of host processors: SCADA/EMS,
Demand Side Management (DSM)/ Load Management, Distributed Applications, and Display
Processors. The SCADA/EMS host is the primary processor, utilizing analogue and digital
monitoring data collected at power plants, Non-Utility Generators, and transmission and
distribution substations via Data Acquisition Units (DAUs) and Remote Terminal Units (RTUs).
The control centre typically contains redundant SCADA/EMS/DMS hosts in a "hot standby"
configuration. The DSM/Load Management host(s) are used by either an operator or EMS
application to initiate load management activities. The Distributed Application host(s) perform
miscellaneous analysis, scheduling, or forecasting functions. Display Processors allow for local
operator and dispatcher display and control. Typically, the control centre will contain one or
more Local Area Networks (LANs) to connect these various hosts. The control centre will also
access several WANs, often through intermediate communications processors. These WAN
connections may include the company-wide area network for communications with the
corporate host and a distinct real-time SCADA network. Each control centre will also have one
or more TASE.2 instances to handle data exchange with remote control centres.
Other classes of host processors like archive systems, engineering stations, or quality control
systems (e.g. for data recording according to ISO 9000) may also be included. The application
of the TASE.2 control centre model is in principle unlimited. This model provides a common
and abstract definition applicable for any real systems which have comparable requirements.

60870-6-503 © IEC:2002(E) – 9 –
1.2 Architecture
The TASE.2 protocol relies on the use of MMS services (and hence the underlying MMS
protocol) to implement the control centre data exchange. Figure 1 shows the relationship of
TASE.2, the MMS provider, and the rest of the protocol stack. In most cases, the values of
objects being transferred are translated from/to the local machine representation automatically
by the local MMS provider. Some TASE.2 objects require a common syntax (representation)
and meaning (interpretation) by both communicating TASE.2 systems. This common
representation and interpretation constitutes a form of protocol. The control centre applications
are not part of this standard. It is assumed that these applications request TASE.2 operations
and supply control centre data and functions to the TASE.2 implementation as needed. The
specific interface between TASE.2 and the control centre applications is a local issue and not
part of this standard.
Control centre Control centre
Control centre
application objects application
TASE.2
TASE.2
MMS objects
MMS MMS
7 7
MMS PDU
ACSE APDU ACSE
6 6
Presentation Presentation
PPDU
5 5
Session Session
SPDU
4 4
Transport Transport
TPDU
3 3
Network Network
NPDU
2 2
Data link Data link
DPDU
1 Bitstream 1
Physical Physical
IEC  868/02
Figure 1 – Protocol relationships
The protocol architecture for TASE.2 requires the use of ISO protocols in layers 5-7 of the OSI
reference model. The Transport Profiles (layers 1-4) may use virtually any standard or de-facto
standard (including TCP/IP) connection-mode transport layer and connectionless-mode
network layer services over any type of transmission media.

– 10 – 60870-6-503  IEC:2002(E)
1.3 Network Model
The TASE.2 Data Exchange network may be either a private or public packet-switched or mesh
network connecting communications processors which provide adequate routing functionality to
allow for redundant paths and reliable service.
Figure 2 shows a typical network topology using a router-based Wide Area Network (WAN).
The WAN provides routing and reliable service between control centres (which may include
internal networks and routing capabilities).
The mesh network shown in figure 3 demonstrates the concept of redundant paths for a mesh
network. Each control centre maintains its own series of direct circuits, and also provides a
mechanism for routing between those direct circuits. Control Centre C provides an alternate
routing path for network traffic going from Control Centre A to B. This network configuration
requires key control centres to provide significant routing capabilities.
Control
Control Control
Control
Centre A
Centre B Centre B
Centre A
WAN
Control
Control
Centre C
Centre C
IEC  869/02 IEC  870/02
Figure 2 – Router-based WAN Figure 3 – Mesh network
1.4 Relation between TASE.2 and MMS
The TASE.2 resides on top of MMS. It describes a standardized application of MMS using the
MMS services and protocol. TASE.2 enhances the functionality of MMS by specifying
structured data mapped to MMS objects and assigning specific semantics to it. As an example
of pure MMS services, MMS allows reading data from a remote system. The data will be
responded without any specific condition. If these data are read depending on very specific
conditions (e.g. on change only) then TASE.2 provides appropriate services which are not
provided by MMS.
Though the specific requirements agreed upon within IEC TC 57 have led to the definition of
TASE.2 there are several other application domains (outside the control centres) with less, very
limited or mixed requirements which may use the TASE.2 services. These other areas are
outside the scope of this standard but the use of TASE.2 goes far beyond the specific scope of
this standard.
TASE.2 provides an independent and scaleable set of services to allow efficient
implementations optimized for the respective requirements of a control centre. It does this by
defining several conformance building blocks. MMS offers also a scaleability of its services
specifying MMS Conformance Building Blocks (CBBs). A simple TASE.2 implementation
requires only a simple MMS implementation.

60870-6-503 © IEC:2002(E) – 11 –
TASE.2 and MMS provide their services to their respective users. MMS provides its services to
TASE.2 and TASE.2 provides its services to the control centre application. MMS is an
independent standard that can provide its services also to users other than TASE.2 – it may
serve directly to specific control centre applications and to any other application. This means
that the use of MMS is not restricted to TASE.2.
For requirements outside the scope of this standard or for future requirements, for example
journaling of data, downloading and uploading of mass data like programs, additional MMS
models and services, i.e. Journaling and Domain Loading respective can be applied by an real
system in addition to TASE.2. This is possible because the additional application of MMS
objects and services is independent of the use of TASE.2 and the use of MMS by TASE.2.
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 60870-6-702:1998, Telecontrol equipment and systems – Part 6-702: Telecontrol protocols
compatible with ISO standards and ITU-T recommendations – Functional profile for providing
the TASE.2 application service in end systems
IEC 60870-6-802:2002, Telecontrol equipment and systems – Part 6-802: Telecontrol protocols
compatible with ISO standards and ITU-T recommendations – TASE.2 Object models
ISO/IEC 8073, Information technology – Open Systems Interconnection – Protocol for providing
the connection-mode transport service
ISO/IEC 8208:2000, Information technology – Data communications – X.25 Packet Layer
Protocol for Data Terminal Equipment
ISO/IEC 8473, Information technology – Protocol for providing the connectionless-mode
network service
ISO/IEC 8802-3:2001, Information technology – Telecommunications and information exchange
between systems – Local and metropolitan area networks – Specific requirements –
Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and
physical layer specifications
ISO 9506-1:2000, Industrial automation systems – Manufacturing Message Specification –
Part 1: Service definition
ISO 9506-2:2000, Industrial automation systems – Manufacturing Message Specification –
Part 2: Protocol specification
ISO/IEC 9542, Information processing systems – Telecommunications and information
exchange between systems – End system to Intermediate system routing exchange protocol for
use in conjunction with the Protocol for providing the connectionless-mode network service
(ISO 8473)
___________
– 12 – 60870-6-503  IEC:2002(E)
ISO/IEC 10589:1992, Information technology – Telecommunications and information exchange
between systems – Intermediate system to intermediate system intra-domain-routing exchange
protocol for use in conjunction with the protocol for providing the connectionless-mode network
Service (ISO 8473)
ISO/IEC ISP 10608-1:1992, Information technology – International Standardized Profile TAnnnn
– Connection-mode Transport Service over Connectionless-mode Network Service – Part 1:
General overview and subnetwork-independant requirements
ISO/IEC ISP 10608-2:1992, Information technology – International Standardized Profile TAnnnn
– Connection-mode Transport Service over Connectionless-mode Network Service – Part 2:
TA51 profile including subnetwork-dependent requirements for CSMA/CD Local Area Networks
(LANs)
ISO/IEC ISP 10608-5:1992, Information technology – International Standardized Profile TAnnnn
– Connection-mode Transport Service over Connectionless-mode Network Service – Part 5:
TA1111/TA1121 profiles including subnetwork-dependent requirements for X.25 packet-
switched data networks using virtual calls
ISO/IEC ISP 10613-1:1994, Information technology – International Standardized Profile RA –
Relaying the Connectionless-mode Network Service – Part 1: Subnetwork-independent
requirements
ISO/IEC ISP 10613-2:1994, Information technology – International Standardized Profile RA –
Relaying the Connectionless-mode Network Service – Part 2: LAN Subnetwork-dependent,
media-independent requirements
ISO/IEC ISP 10613-3:1994, Information technology – International Standardized Profile RA –
Relaying the Connectionless-mode Network Service – Part 3: CSMA/CD LAN subnetwork-
dependent,media-dependent requirements
ISO/IEC ISP 10613-5:1994, Information technology – International Standardized Profile RA –
Relaying the Connectionless-mode Network Service – Part 5: Definition of profile RA51.51,
relaying the Connectionless-mode Network Service between CSMA/CD LAN subnetworks
ISO/IEC ISP 10613-7:1994, Information technology – International Standardized Profile RA –
Relaying the Connectionless-mode Network Service – Part 7: PSDN subnetwork-dependent,
media-dependent requirements for virtual calls over a permanent access
ISO/IEC ISP 10613-8:1994, Information technology – International Standardized Profile RA –
Relaying the Connectionless-mode Network Service – Part 8: Definition of profile RA51.1111,
relaying the Connectionless-mode Network Service between CSMA/CD LAN subnetworks and
PSDNs using virtual calls over a PSTN leased line permanent access
ISO/IEC ISP 10613-9:1994, Information technology – International Standardized Profile RA –
Relaying the Connectionless-mode Netw
...