SIST EN 62056-1-0:2015

ELECTRICITY METERING DATA EXCHANGE - The DLMS/COSEM suite - Part 1-0: Smart metering standardization framework

This part of IEC 62056 provides information on the smart metering use cases and on
architectures supported by the IEC 62056 DLMS/COSEM series of standards specifying
electricity meter data exchange. It describes the standardization framework including:
• the principles on which the standards shall be developed;
• the ways the existing standards shall be extended to support new use cases and to
accommodate new communication technologies, while maintaining coherency;
• the aspects of interoperability and information security.
It also provides guidance for selecting the suitable standards for a specific interface within the
smart metering system.
Other aspects of metering covered by TC13, like metrological requirements, testing, safety
and dependability are out of the scope of this Standard.

Datenkommunikation der elektrischen Energiemessung - DLMS/COSEM - Teil 1-0: Normungsrahmen für die intelligente Messung

ECHANGE DES DONNEES DE COMPTAGE DE L'ELECTRICITE - La suite DLMS/COSEM - Partie 1-0: Cadre de normalisation du comptage intelligent

L'IEC 62056-1-0:2014 fournit des informations relatives aux cas d'utilisation du comptage intelligent et aux architectures supportées par la série de normes IEC 62056 DLMS/COSEM spécifiant l'échange des données de comptage de l'électricité. Elle décrit le cadre de normalisation incluant:
- les principes selon lesquels les normes doivent être développées;
- la façon dont les normes existantes doivent être étendues pour couvrir de nouveaux cas d'utilisation et pour accueillir de nouvelles technologies de communication, tout en maintenant la cohérence;
- les aspects d'interopérabilité et de sécurité des informations. Elle fournit également des lignes directrices pour la sélection des normes adaptées à une interface spécifique au sein du système de comptage intelligent.

Izmenjava podatkov pri merjenju električne energije - Niz DLMS/COSEM - 1-0. del: Struktura standarda za inteligentno merjenje

Ta del standarda IEC 62056 ponuja informacije o primerih uporabe inteligentnega merjenja in arhitekturah, podprtih z nizom standardov IEC 62056 DLMS/COSEM, ki določajo izmenjavo podatkov pri merjenju električne energije. Opisuje okvira standardizacije, vključno s/z:
• principi, na katerih je treba razviti standarde;
• načini za razširitev obstoječih standardov za podporo novim primerom uporabe in za prilagoditev novim komunikacijskim tehnologijam ob ohranjanju skladnosti;
• vidiki interoperabilnosti in informacijske varnosti.
Ponuja tudi napotke za izbiro primernih standardov za poseben vmesnik v okviru inteligentnega merilnega sistema.
Drugi vidiki merjenja, ki so zajeti v TC13, kot so meroslovne zahteve, preskušanje, varnost in zanesljivost, ne spadajo na področje uporabe tega standarda.

General Information

• Status: Published
• Publication Date: 06-Aug-2015
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 35.100.05 - Multilayer applications
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: MEE - Equipment for electrical energy measurement and load control
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Jul-2015
• Due Date: 12-Sep-2015
• Completion Date: 07-Aug-2015
• Ref Project: EN 62056-1-0:2015 - Electricity metering data exchange - The DLMS/COSEM suite - Part 1-0: Smart metering standardization framework

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62056-1-0:2015
01-september-2015
,]PHQMDYDSRGDWNRYSULPHUMHQMXHOHNWULþQHHQHUJLMH1L]'/06&26(0GHO
6WUXNWXUDVWDQGDUGD]DLQWHOLJHQWQRPHUMHQMH
ELECTRICITY METERING DATA EXCHANGE - The DLMS/COSEM suite - Part 1-0:
Smart metering standardization framework
ECHANGE DES DONNEES DE COMPTAGE DE L'ELECTRICITE - La suite
DLMS/COSEM - Partie 1-0: Cadre de normalisation du comptage intelligent
Ta slovenski standard je istoveten z: EN 62056-1-0:2015
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
35.100.05 9HþVORMQHXSRUDEQLãNH Multilayer applications
UHãLWYH
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST EN 62056-1-0:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62056-1-0:2015

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SIST EN 62056-1-0:2015


EUROPEAN STANDARD EN 62056-1-0

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2015
ICS 17.220; 35.110; 91.140.50

English Version
Electricity metering data exchange - The DLMS/COSEM suite -
Part 1-0: Smart metering standardization framework
(IEC 62056-1-0:2014)
Échange des données de comptage de l'électricité - La Datenkommunikation der elektrischen Energiemessung -
suite DLMS/COSEM - Partie 1-0: Cadre de normalisation DLMS/COSEM - Teil 1-0: Normungsrahmen für die
du comptage intelligent intelligente Messung
(IEC 62056-1-0:2014) (IEC 62056-1-0:2014)
This European Standard was approved by CENELEC on 2014-07-09. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62056-1-0:2015 E

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SIST EN 62056-1-0:2015
EN 62056-1-0:2015 - 2 -
Foreword
The text of document 13/1574/FDIS, future edition 1 of IEC 62056-1-0, prepared by IEC/TC 13
"Electrical energy measurement, tariff- and load control" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN 62056-1-0:2015.

The following dates are fixed:
(dop) 2015-12-05
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2017-07-09
standards conflicting with the
document have to be withdrawn


Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 62056-1-0:2014 was approved by CENELEC as a
European Standard without any modification.

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SIST EN 62056-1-0:2015
- 3 - EN 62056-1-0:2015

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61334-4-32 -  Distribution automation using distribution EN 61334-4-32 -
line carrier systems -- Part 4: Data
communication protocols -- Section 32:
Data link layer - Logical link control (LLC)
IEC 61334-5-1 -  Distribution automation using distribution EN 61334-5-1 -
line carrier systems -- Part 5-1: Lower layer
profiles - The spread frequency shift keying
(S-FSK) profile
IEC 62056-3-1 -  Electricity metering data exchange - The EN 62056-3-1 -
DLMS/COSEM suite -- Part 3-1: Use of
local area networks on twisted pair with
carrier signalling
IEC 62056-4-7 -  Electricity metering data exchange - The FprEN 62056-4-7 -
DLMS/COSEM suite -- Part 4-7:
DLMS/COSEM transport layer for IP
networks
IEC 62056-5-3 2013 Electricity metering data exchange - The EN 62056-5-3 2014
DLMS/COSEM suite -- Part 5-3:
DLMS/COSEM application layer
IEC 62056-6-1 2013 Electricity metering data exchange - The EN 62056-6-1 2013
DLMS/COSEM suite -- Part 6-1: COSEM
Object Identification System (OBIS)
IEC 62056-6-2 2013 Electricity metering data exchange - The EN 62056-6-2 2013
DLMS/COSEM suite -- Part 6-2: COSEM
interface classes
IEC 62056-7-6 -  Electricity metering data exchange - The EN 62056-7-6 -
DLMS/COSEM suite -- Part 7-6: The 3-
layer, connection-oriented HDLC based
communication profile
IEC 62056-8-3 -  Electricity metering data exchange - The EN 62056-8-3 -
DLMS/COSEM suite -- Part 8-3:
Communication profile for PLC S-FSK
neighbourhood networks
IEC 62056-9-7 -  Electricity metering data exchange - The EN 62056-9-7 -
DLMS/COSEM suite -- Part 9-7:
Communication profile for TCP-UDP/IP
networks
IEC 62056 series Electricity metering - Data exchange for EN 62056 series
meter reading, tariff and load control
IEC 62056-42 -  Electricity metering - Data exchange for EN 62056-42 -
meter reading, tariff and load control -- Part
42: Physical layer services and procedures
for connection-oriented asynchronous data
exchange
IEC 62056-46 -  Electricity metering - Data exchange for EN 62056-46 -
meter reading, tariff and load control -- Part
46: Data link layer using HDLC protocol

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SIST EN 62056-1-0:2015




IEC 62056-1-0

®


Edition 1.0 2014-06




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Electricity metering data exchange – The DLMS/COSEM suite –

Part 1-0: Smart metering standardisation framework




Échange des données de comptage de l'électricité – La suite DLMS/COSEM –

Partie 1-0: Cadre de normalisation du comptage intelligent
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX Q


ICS 17.220; 35.110; 91.140.50 ISBN 978-2-8322-1617-0



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62056-1-0:2015
– 2 – IEC 62056-1-0:2014 © IEC 2014

CONTENTS

FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions. 7
3.2 Abbreviations . 8
4 Smart metering processes and use cases . 8
5 Smart metering reference architecture . 9
6 Interfaces to external systems . 10
7 The basic principles followed in the IEC 62056 DLMS/COSEM suite . 11
7.1 General . 11
7.2 Interoperability and flexibility . 11
7.3 Security . 11
7.4 Access security . 12
7.5 Communication channel security . 12
7.6 End-to-end security . 12
7.7 Security algorithms and mechanisms . 13
8 Data model and communication channels . 13
8.1 General . 13
8.2 The data model and the application layer . 13
8.3 The set of communication channels . 13
8.4 The communication profiles . 13
9 The standards framework . 14
Annex A (informative) IEC 62056 standards supporting the smart metering interfaces . 15

Figure 1 – Smart metering architecture . 10
Figure 2 – The standards framework for smart metering . 14

Table 1 – Supported business processes and use cases . 8
Table A.1 – Available IEC 62056 standards supporting the smart metering architecture
of Figure 1 . 15
Table A.2 – Technical Specifications defining the interfaces to external systems . 16

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SIST EN 62056-1-0:2015
IEC 62056-1-0:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –

Part 1-0: Smart metering standardisation framework

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 62056-1-0 has been prepared by IEC technical committee 13:
Electrical energy measurement and control.
The text of this standard is based on the following documents:
FDIS Report on voting
13/1574/FDIS 13/1580/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.

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– 4 – IEC 62056-1-0:2014 © IEC 2014
A list of all parts in the IEC 62056 series, published under the general title Electricity metering
data exchange – The DLMS/COSEM suite, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.

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SIST EN 62056-1-0:2015
IEC 62056-1-0:2014 © IEC 2014 – 5 –
INTRODUCTION
With the growing number of smart metering deployments, secure and interoperable data
exchange between the different system components becomes essential. Besides supporting
the execution of the supplier-consumer contract and providing the necessary billing data the
smart meter becomes also the source of valuable information for the efficient operation of the
smart grid.
The increasing range of applications that depend on metering data leads to a growing amount
of data to be exchanged within the smart metering system and via the interfaces to other
systems. Smart metering systems must be adaptable to different communication channels
without creating any data incompatibilities for the supported applications.
The standards in the IEC 62056 DLMS/COSEM suite have been constantly improved and
extended considering the growing requirements of the smart metering and smart grid
applications. In particular, the object oriented COSEM data model has been extended with
new interface classes supporting new smart metering and smart grid use cases. The
application layer has been “fortified” with state-of-the art security features offering scalable
security for the entire range of applications via a large range of communication channels. With
the introduction of the concept of “communication profiles” the IEC 62056 DLMS/COSEM suite
provides the means to link different communication channels standards with the consistent
data model of DLMS/COSEM.
This International Standard summarises the principles the IEC 62056 standards are built on
and sets the rules for future extensions to guarantee consistency.
Smart metering forms an important part of smart grids and smart homes. In order to ensure
the efficient and secure flow of information between the different applications and actors in
the energy market, harmonisation of the standards worked out by the corresponding
standardisation committees becomes necessary. In particular, a smart metering system offers
interfaces to electricity and non-electricity meters, to home automation, to substation
automation and to electricity distribution management systems. The standardisation concepts
described in this standard ensure consistency within the scope of smart metering as a
prerequisite to define harmonised interfaces to smart grid and smart home systems.
The standards of the IEC 62056 DLMS/COSEM suite have been developed by IEC TC13 for
the purposes of electricity metering. Some of the standards – in particular the COSEM data
model – are also used by other Technical Committees responsible for non-electricity metering.

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– 6 – IEC 62056-1-0:2014 © IEC 2014
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –

Part 1-0: Smart metering standardisation framework



1 Scope
This part of IEC 62056 provides information on the smart metering use cases and on
architectures supported by the IEC 62056 DLMS/COSEM series of standards specifying
electricity meter data exchange. It describes the standardization framework including:
• the principles on which the standards shall be developed;
• the ways the existing standards shall be extended to support new use cases and to
accommodate new communication technologies, while maintaining coherency;
• the aspects of interoperability and information security.
It also provides guidance for selecting the suitable standards for a specific interface within the
smart metering system.
Other aspects of metering covered by TC13, like metrological requirements, testing, safety
and dependability are out of the scope of this Standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61334-4-32, Distribution automation using distribution line carrier systems – Part 4: Data
communication protocols – Section 32: Data link layer – Logical link control (LLC)
IEC 61334-5-1, Distribution automation using distribution line carrier systems – Part 5-1:
Lower layer profiles – The spread frequency shift keying (S-FSK) profile
IEC 62056 (all parts), Electricity metering data exchange – The DLMS/COSEM suite
IEC 62056-3-1, Electricity metering data exchange – The DLMS/COSEM suite – Part 3-1: Use
of local area networks on twisted pair with carrier signalling
IEC 62056-4-7, Electricity metering – Data exchange for meter reading, tariff and load control
– Part 4-7: COSEM transport layers for IPv4 networks (to be published)
IEC 62056-5-3:2013, Electricity metering data exchange – The DLMS/COSEM suite –
Part 5-3: DLMS/COSEM application layer
IEC 62056-6-1:2013, Electricity metering data exchange – The DLMS/COSEM suite –
Part 6-1: Object Identification System (OBIS)
IEC 62056-6-2:2013, Electricity metering data exchange – The DLMS/COSEM suite –
Part 6-2: COSEM interface classes

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SIST EN 62056-1-0:2015
IEC 62056-1-0:2014 © IEC 2014 – 7 –
IEC 62056-7-6, Electricity metering data exchange – The DLMS/COSEM suite – Part 7-6: The
3-layer, connection-oriented HDLC based communication profile
IEC 62056-8-3, Electricity metering data exchange – The DLMS/COSEM suite – Part 8-3:
Communication profile for PLC S-FSK neighbourhood networks
IEC 62056-9-7, Electricity metering data exchange – The DLMS/COSEM suite – Part 9-7:
Communication profile for TCP-UDP/IP networks
IEC 62056-42, Electricity metering – Data exchange for meter reading, tariff and load control
– Part 42: Physical layer services and procedures for connection-oriented asynchronous data
exchange
IEC 62056-46, Electricity metering – Data exchange for meter reading, tariff and load control
– Part 46: Data link layer using HDLC protocol
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in the standards of the
IEC 62056 series apply as well as the following:
3.1.1
communication channel
physical or logical channel to transport data over single or multiple communication media
3.1.2
communication medium
physical medium to transmit signals carrying information
3.1.3
exchangeability
ability of a specific system component to replace a specific component in an existing system
without any need for configuration neither on the component’s side nor of the system’s side.
Interoperability is a necessary but not a sufficient condition to achieve exchangeability. For
hardware components the expression “plug-and-play” is also used to describe their
exchangeability
3.1.4
external systems
systems supporting use cases beyond the scope of smart metering but exchanging
information with the smart metering system
3.1.5
interoperability
ability of two or more system components to exchange information and to use the information
that has been exchanged for the purpose the component is designed for
3.1.6
open standard
standard made available to the general public and being developed (or approved) and
maintained via a collaborative and consensus driven process

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3.2 Abbreviations
The following abbreviations are used in this standard:
APDU Application Protocol Data Unit
CIM Common Information Model of TC57
COSEM Companion Specification for Energy Metering
DLMS Device Language Message Specification
ERP Enterprise Resource Planning
HES Head End System
LN Local Network
LNAP Local Network Access Point
NN Neighbourhood Network
NNAP Neighbourhood Network Access Point
PLC Power Line Carrier
WAN Wide Area Network
4 Smart metering processes and use cases
Table 1 gives an overview on the use cases that shall be supported by the smart metering
standards. The use cases are clustered into business processes. This clustering serves just
illustration purposes; it may vary from utility to utility.
Table 1 – Supported business processes and use cases
Business process Use case
Obtain meter readings on demand
Obtain scheduled meter reading
Contracting and billing Set and maintain contractual parameters in the meter (see NOTE 2)
Execute supply control
Execute load control
Customer support Provide information to the energy consumer
Meter commissioning and registration
Meter supervision
Maintenance of the security system
Manage events and alarms
Infrastructure maintenance
Firmware update
Clock synchronisation
Disconnection and re-connection of the consumer’s premises
Quality of supply supervision
NOTE 1 There are no commonly agreed names for the smart metering use cases within the standardisation
community yet. In order to consider the universal scope of the IEC standards generic and self-explanatory
names are used here.
NOTE 2 The contractual parameters consider the credit mode or the debit mode (pre-payment) operation of the
meter.

The detailed requirements of the various use cases depend on the market and on the legal
environment the smart metering system is operating in. The supporting standards shall be

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IEC 62056-1-0:2014 © IEC 2014 – 9 –
designed to offer enough flexibility to meet the different market needs and the different legal
environments.
In order to facilitate achieving interoperability, security and efficiency, the standards shall
consider all aspects of data exchange in a smart metering system, including the functions to
be supported, the data models (semantics), the data presentation (syntax), and the
communication protocols for transporting the data over the interfaces using various
communication technologies.
5 Smart metering reference architecture
Figure 1 shows the smart metering reference architecture enabling the data exchange
necessary to support the use cases of Table 1. The different system components and their
interfaces are identified. The partitioning between the different components is based purely on
communication aspects; i.e. components and interfaces are specified wherever a transition
from one communication medium to another may be considered.
A comprehensive set of smart metering standards shall support all interfaces identified in
Figure 1. All specifications of communication protocols, data access methods or data
structures shall describe only the “outside view”; i.e. how the data and the communication
protocols behave on the interfaces. The behaviour within the components (“inside view”) is
implementation specific and is therefore out of the scope of the standards in the IEC 62056
series.
A practical realisation of a smart metering system will typically contain a subset of the
components and interfaces shown in Figure 1. Components and interfaces which are not
exposed and are therefore not accessible do not need to fulfil any standards.

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IEC  1717/14
1
Figure 1 – Smart metering architecture
EXAMPLE 1 “PLC system”:
A PLC system typically uses the C interface between the Metering device and the NNAP (Data Concentrator). The
communication between the NNAP and the HES uses the G2 interface.
EXAMPLE 2 “IP communication via GPRS”
Typically uses the G1 interface between the meter and the HES.
EXAMPLE 3 “Hand Held Unit for local meter access”
This typically uses the M interface.
6 Interfaces to external systems
Smart metering systems exchange data with external systems on several levels using
different interfaces. On LNAP level interfaces to Home Automation and to non-electricity
meters may be provided, on NNAP level typically interfaces to substation automation
equipment may be required, whereas on HES level typically interfaces to billing and ERP
(Enterprise Resource Planning) systems are provided.
The interfaces between the smart metering system and these external systems shall use the
standards of the IEC 62056 DLMS/COSEM suite or shall use the existing standards of the
external system. Interoperability shall be achieved on data model level by mapping the data
models of IEC 62056-6-2 and IEC 62056-6-1 to the data model of the external system.
NOTE 1 The specification of the mapping between the COSEM data model and the data model of CIM
(IEC 61968-9) supporting the interface between a smart metering system and an ERP system is undertaken by
...