SIST EN 62056-8-3:2013

Electricity metering data exchange - The DLMS/COSEM suite - Part 8-3: The PLC S-FSK profile for neighbourhood networks (IEC 62056-8-3:2013)

IEC 62056-8-3:2013 specifies the DLMS/COSEM PLC S-SFK communication profile for neighbourhood networks. It uses standards established by IEC TC 57 in the IEC 61334 series.

Datenkommunikation der elektrischen Energiemessung - DLMS/COSEM - Teil 8-3: PLC S-FSK Spezifikation für Areal-Netze (IEC 62056-8-3:2013)

Echange de données pour le comptage de l'énergie électrique - La suite DLMS/COSEM - Partie 8-3: Profil PLC S-FSK pour réseaux de voisinage (CEI 62056-8-3:2013)

La CEI 62056-8-3:2013 spécifie le profil de communication CPL S-SFK de la DLMS/COSEM pour les réseaux de voisinage. Elle utilise les normes établies par le TC 57 de la CEI dans la série CEI 61334.

Izmenjava podatkov meritev električne energije - Niz DLMS/COSEM - 8-3. del: Profil PLC S-FSK za sosedska omrežja (IEC 62056-8-3:2013)

Ta del standarda IEC 62056 določa komunikacijski profil DLMS/COSEM PLC S-SFK za sosedska omrežja. Uporablja standarde, ki jih je vzpostavil IEC TC 57 v skupini IEC 61334 (Avtomatizacija porazdelitve s sistemom DLC) in določa razširitve nekaterih teh standardov.

General Information

• Status: Published
• Publication Date: 10-Sep-2013
• 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: 03-Sep-2013
• Due Date: 08-Nov-2013
• Completion Date: 11-Sep-2013
• Mandate: M/441 - Standardisation mandate to CEN, CENELEC and ETSI in the field of measuring instruments for the development of an open architecture for utility meters involving communication protocols enabling interoperability
• Mandate: M/490 - Standardisation mandate to the European Standardisation Organisations (ESOs) to support European Smart Grid deployment
• Ref Project: EN 62056-8-3:2013 - Electricity metering data exchange - The DLMS/COSEM suite - Part 8-3: Communication profile for PLC S-FSK neighbourhood networks

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2013
,]PHQMDYDSRGDWNRYPHULWHYHOHNWULþQHHQHUJLMH1L]'/06&26(0GHO3URILO
3/&6)6.]DVRVHGVNDRPUHåMD,(&
Electricity metering data exchange - The DLMS/COSEM suite - Part 8-3: The PLC S-
FSK profile for neighbourhood networks (IEC 62056-8-3:2013)
Datenkommunikation der elektrischen Energiemessung - DLMS/COSEM - Teil 8-3: PLC
S-FSK Spezifikation für Areal-Netze (IEC 62056-8-3:2013)
Echange de données pour le comptage de l'énergie électrique - La suite DLMS/COSEM
- Partie 8-3: Profil PLC S-FSK pour réseaux de voisinage (CEI 62056-8-3:2013)
Ta slovenski standard je istoveten z: EN 62056-8-3:2013
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62056-8-3
NORME EUROPÉENNE
August 2013
EUROPÄISCHE NORM
ICS 17.220; 35.110; 91.140.50
English version
Electricity metering data exchange -
The DLMS/COSEM suite -
Part 8-3: Communication profile for PLC S-FSK neighbourhood networks
(IEC 62056-8-3:2013)
Echange des données de comptage de Datenkommunikation der elektrischen
l'électricité - Energiemessung -
La suite DLMS/COSEM - DLMS/COSEM -
Partie 8-3: Profil de communication pour Teil 8-3: PLC S-FSK Spezifikation für
réseaux de voisinage CPL S-FSK Areal-Netze
(CEI 62056-8-3:2013) (IEC 62056-8-3:2013)

This European Standard was approved by CENELEC on 2013-06-20. 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.

CENELEC
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

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62056-8-3:2013 E
Foreword
The text of document 13/1526/FDIS, future edition 1 of IEC 62056-8-3, 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 62056-8-3:2013.
The following dates are fixed:
• latest date by which the document has
(dop) 2014-03-20
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national
(dow) 2016-06-20
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 62056-8-3:2013 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61334-4-512:2001 NOTE  Harmonized as EN 61334-4-512:2002 (not modified).

- 3 - EN 62056-8-3:2013
Annex ZA
(normative)
Normative references to i nternational 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  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 60050 Series International Electrotechnical Vocabulary - -
(IEV)
IEC 61334-4-1 1996 Distribution automation using distribution line EN 61334-4-1 1996
carrier systems -
Part 4: Data communication protocols -
Section 1: Reference model of the
communication system
IEC 61334-4-32 1996 Distribution automation using distribution line EN 61334-4-32 1996
carrier systems -
Part 4: Data communication protocols -
Section 32: Data link layer - Logical link
control (LLC)
IEC 61334-4-511 2000 Distribution automation using distribution line EN 61334-4-511 2000
carrier systems -
Part 4-511: Data communication protocols -
Systems management - CIASE protocol

IEC 61334-5-1 2001 Distribution automation using distribution line EN 61334-5-1 2001
carrier systems -
Part 5-1: Lower layer profiles - The spread
frequency shift keying (S-FSK) profile

IEC/TR 62051 1999 Electricity metering - Glossary of terms - -

IEC/TR 62051-1 2004 Electricity metering - Data exchange for meter - -
+ corr. June 2005 reading, tariff and load control - Glossary of
terms -
Part 1: Terms related to data exchange with
metering equipment using DLMS/COSEM

IEC 62056-5-3 2013 Electricity metering data exchange - The EN 62056-5-3 2013
DLMS/COSEM suite -
Part 5-3: DLMS/COSEM application layer

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 62056-46 2002 Electricity metering - Data exchange for meter EN 62056-46 2002
+ A1 2006 reading, tariff and load control - + A1 2007
Part 46: Data link layer using HDLC protocol

ISO/IEC 8802-2 1998 Information technology - Telecommunications - -
+ corr. October 2000 and information exchange between systems -
Local and metropolitan area networks -
Specific requirements -
Part 2: Logical link control
IEC 62056-8-3 ®
Edition 1.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electricity metering data exchange – The DLMS/COSEM suite –

Part 8-3: Communication profile for PLC S-FSK neighbourhood networks

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

Partie 8-3: Profil de communication pour réseaux de voisinage CPL S-FSK

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 17.220; 35.110; 91.140.50 ISBN 978-2-83220-807-6

– 2 – 62056-8-3 © IEC:2013
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 8
4 Targeted communication environments . 9
5 Reference model . 11
6 The physical layer (PhL) . 11
7 The data link layer . 12
7.1 General . 12
7.2 The MAC sublayer . 12
7.3 The connectionless LLC sublayer . 12
7.4 The HDLC based LLC sublayer . 13
7.5 Co-existence of the connectionless and the HDLC based LLC sublayers . 13
8 The application layer (AL) . 14
9 The application process (AP) . 14
10 The Configuration Initiation Application Service Element (CIASE) . 14
10.1 Overview . 14
10.2 The Discover service . 14
10.3 The Register service . 15
10.4 The Ping Service . 15
10.5 The RepeaterCall service . 17
10.6 The ClearAlarm service . 19
10.7 The Intelligent Search Initiator process . 21
10.7.1 General . 21
10.7.2 Operation . 21
10.8 The Discovery and Registration process . 24
10.9 Abstract and transfer syntax . 28
11 Addressing . 28
11.1 General . 28
11.2 IEC 61334-5-1 MAC addresses . 28
11.3 Reserved special LLC addresses . 28
11.3.1 General . 28
11.3.2 Reserved addresses for the IEC 61334-4-32 LLC sublayer . 29
11.3.3 Reserved addresses for the HDLC based LLC sublayer . 29
11.3.4 Source and destination APs and addresses of CI-PDUs . 30
12 Specific considerations / constraints for the IEC 61334-4-32 LLC sublayer based
profile . 31
12.1 Establishing application associations . 31
12.2 Application association types, confirmed and unconfirmed xDLMS services . 33
12.3 xDLMS client/server type services . 33
12.4 Releasing application associations . 33
12.5 Service parameters of the COSEM-OPEN / -RELEASE / -ABORT services. 34
12.6 The EventNotification service and the TriggerEventNotificationSending
service . 34

62056-8-3 © IEC:2013 – 3 –
12.7 Transporting long messages . 35
12.8 Broadcasting . 35
13 Specific considerations / constraints for the HDLC LLC sublayer based profile . 35
13.1 Establishing Application Associations . 35
13.2 Application association types, confirmed and unconfirmed xDLMS services . 36
13.3 xDLMS client/server type services . 37
13.4 Correspondence between AAs and data link layer connections, releasing
AAs . 37
13.5 Service parameters of the COSEM-OPEN/ -RELEASE/ -ABORT services . 37
13.6 The EventNotification service and protocol . 37
13.7 Transporting long messages . 37
13.8 Broadcasting . 37
14 Abstract syntax of CIASE APDUs . 37
Annex A (informative) S-FSK PLC encoding examples . 39
Bibliography . 51
Index . 52

Figure 1 – Communication architecture . 10
Figure 2 – The DLMS/COSEM S-FSK PLC communication profile . 11
Figure 3 – Co-existence of the connectionless and the HDLC based LLC sublayers. 13
Figure 4 – Intelligent Search Initiator process flow chart . 22
Figure 5 – The Discovery and Registration process . 25
Figure 6 – MSC for the discovery and registration process . 32
Figure 7 – MSC for successful confirmed AA establishment . 32
Figure 8 – MSC for releasing an Application Association . 34
Figure 9 – MSC for an EventNotification service . 35
Figure 10 – MSC for the Discovery and Registration process . 36
Figure 11 – MSC for successful confirmed AA establishment and the GET service . 36

Table 1 – Service parameters of the Discover service primitives . 15
Table 2 – Service parameters of the Register service primitives . 15
Table 3 – Service parameters of the PING service primitives . 16
Table 4 – Service parameters of the RepeaterCall service primitives . 17
Table 5 – Service parameters of the ClearAlarm service primitives . 20
Table 6 – MAC addresses . 28
Table 7 – Reserved IEC 61334-4-32 LLC addresses on the client side . 29
Table 8 – Reserved IEC 61334-4-32 LLC addresses on the server side . 29
Table 9 – Reserved HDLC based LLC addresses on the client side . 29
Table 10 – Reserved HDLC based LLC addresses on the server side . 29
Table 11 – Source and Destination APs and addresses of CI-PDUs . 31
Table 12 – Application associations and data exchange in the S-FSK PLC profile using
the connectionless LLC sublayer . 33

– 4 – 62056-8-3 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –
Part 8-3: Communication profile for PLC S-FSK neighbourhood networks

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.
The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed that compliance
with this International Standard may involve the use of a maintenance service concerning the stack of protocols on
which the present standard IEC 62056-8-3 is based.
The IEC takes no position concerning the evidence, validity and scope of this maintenance service.
The provider of the maintenance service has assured the IEC that he is willing to provide services under
reasonable and non-discriminatory terms and conditions for applicants throughout the world. In this respect, the
statement of the provider of the maintenance service is registered with the IEC. Information may be obtained from:
DLMS User Association
Zug/Switzerland
www.dlms.ch
___________
Device Language Message Specification.

62056-8-3 © IEC:2013 – 5 –
International Standard IEC 62056-8-3 has been prepared by technical committee 13:
Electrical energy measurement, tariff- and load control.
The text of this standard is based on the following documents:
FDIS Report on voting
13/1526/FDIS 13/1544/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.
A list of all the 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.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
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.
– 6 – 62056-8-3 © IEC:2013
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –
Part 8-3: Communication profile for PLC S-FSK neighbourhood networks

1 Scope
This part of IEC 62056 specifies the DLMS/COSEM PLC S-SFK communication profile for
neighbourhood networks.
It uses standards established by IEC TC 57 in the IEC 61334 series, Distribution automation
using distribution line carrier systems and it specifies extensions to some of those standards.
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 60050 (all parts), International Electrotechnical Vocabulary (available at
http://www.electropedia.org)
IEC 61334-4-1:1996, Distribution automation using distribution line carrier systems – Part 4:
Data communication protocols – Section 1: Reference model of the communication system
IEC 61334-4-32:1996, Distribution automation using distribution line carrier systems – Part 4:
Data communication protocols – Section 32: Data link layer – Logical link control (LLC)
IEC 61334-4-511:2000, Distribution automation using distribution line carrier systems –
Part 4-511: Data communication protocols – Systems management – CIASE protocol
IEC 61334-5-1:2001, Distribution automation using distribution line carrier systems – Part 5-1:
Lower layer profiles – The spread frequency shift keying (S-FSK) profile
IEC/TR 62051:1999, Electricity metering – Glossary of terms
IEC/TR 62051-1:2004, Electricity metering – Data exchange for meter reading, tariff and load
control – Glossary of terms – Part 1: Terms related to data exchange with metering equipment
using DLMS/COSEM
IEC 62056-46:2002, Electricity metering – Data exchange for meter reading, tariff and load
control – Part 46: Data link layer using HDLC protocol
Amendment 1:2006
IEC 62056-5-3:—, Electricity metering data exchange – The DLMS/COSEM suite – Part 5-3:
DLMS/COSEM application layer
___________
To be published simultaneously with this part of IEC 62056.

62056-8-3 © IEC:2013 – 7 –
IEC 62056-6-2:—, Electricity metering data exchange – The DLMS/COSEM suite – Part 6-2:
COSEM interface classes
ISO/IEC 8802-2:1998, Information technology – Telecommunications and information
exchange between systems – Local and metropolitan area networks – Specific requirements –
Part 2: Logical link control
NOTE See also the Bibliography.
3 Terms, definitions and abbreviations
For the purposes of this document, the terms and definitions given in IEC 60050-300,
IEC/TR 62051 and IEC/TR 62051-1 and the following apply.
Where there is a difference between the definitions in the glossary and those contained in
product standards produced by TC 13, then the latter shall take precedence in applications of
the relevant standard.
3.1 Terms and definitions
3.1.1
initiator
user-element of a client System Management Application Entity (SMAE). It uses the CIASE
and xDLMS ASE and it is identified by its system title
[SOURCE: IEC 61334-4-511:2000, 3.8.1, modified]
3.1.2
active initiator
initiator, which issues or has last issued a CIASE Register request when the server is in the
unconfigured state
[SOURCE: IEC 61334-4-511:2000, 3.9.1]
3.1.3
new system
server system, which is in the unconfigured state: its MAC address equals "NEW-address"
[SOURCE: IEC 61334-4-511:2000, 3.9.3]
3.1.4
new system title
system-title of a new system
Note 1 to entry: This is the system title of a system, which is in the new state.
[SOURCE: IEC 61334-4-511:2000, 3.9.4, modified]
3.1.5
registered system
server system, which has an individual, valid MAC address
Note 1 to entry: Therefore, this MAC address is different from "NEW Address", see IEC 61334-5-1: Medium
Access Control.
[SOURCE: IEC 61334-4-511:2000, 3.9.5, modified]
___________
To be published simultaneously with this part of IEC 62056.

– 8 – 62056-8-3 © IEC:2013
3.1.6
reporting system
server system, which issues a DiscoverReport
[SOURCE: IEC 61334-4-511:2000, 3.9.6, modified]
3.1.7
sub-timeslot
the time needed to transmit two bytes by the physical layer
Note 1 to entry: Timeslots are divided to sub-slots in the RepeaterCall mode of the physical layer.
3.1.8
timeslot
the time needed to transmit a physical frame
Note 1 to entry: As specified in IEC 61334-5-1:2001, 3.3.1, a physical frame comprises 2 bytes preamble, 2 bytes
start subframe delimiter, 38 bytes PSDU and 3 bytes pause.
3.2 Abbreviations
.cnf .confirm service primitive
.ind .indication service primitive
.req .request service primitive
.res .response service primitive
AA Application Association
AARE A-Associate Response – an APDU of the ACSE
AARQ A-Associate Request – an APDU of the ACSE
ACSE Association Control Service Element
AES Advanced Encryption Standard
AL Application Layer
AP Application Process
APDU Application Layer Protocol Data Unit
ASE Application Service Element
ASO Application service Object
A-XDR Adapted Extended Data Representation
CIASE Configuration Initiation Application Service Element
CI-PDU CIASE PDU
Client A station, asking for services. In the case of the 3-layer, CO HDLC based
profile it is the master station
COSEM Companion Specification for Energy Metering
DA Destination Address
DLMS Device Language Message Specification
DLMS UA DLMS User Association
FCS Frame Check Sequence
GCM Galois/Counter Mode, an algorithm for authenticated encryption with
associated data
HCS Header Check Sequence
HDLC High-level Data Link Control
HES (Metering) Head End System
ISO International Organization for Standardization

62056-8-3 © IEC:2013 – 9 –
LLC Logical Link Control (Sublayer)
LN Local Network
LNAP Local Network Access Point
L-SAP LLC sublayer Service Access Point
LSDU LLC Service Data Unit
LV Low voltage
MAC Medium Access Control (sublayer)
MPDU MAC Layer Protocol Data Unit
MSC Message Sequence Chart
NN Neighbourhood Network
NNAP Neighbourhood Network Access Point
NS Number of subframes (S-FSK MAC sublayer)
OSI Open System Interconnection
PDU Protocol Data Unit
PhL Physical Layer
PLC Power Line Carrier
PSDU Physical Layer Service Data Unit
RDR Reply Data on Request (used in IEC 61334-4-32)
RLRE A-Release Response – an APDU of the ACSE
RLRQ A-Release Request – an APDU of the ACSE
SA Source Address
SAP Service Access Point
SDN Send Data Non-acknowledged (used in IEC 61334-4-32)
SDU Service Data Unit
SMAE Systems Management Application Entity
SMAP Systems Management Application Process
SNRM Set Normal Response Mode (a HDLC frame type)

4 Targeted communication environments
The DLMS/COSEM PLC S-FSK communication profile is intended for remote data exchange
on Neighbourhood Networks (NN) between Neighbourhood Network Access Points (NNAP)
and Local Network Access Points (LNAPs) or End Devices using S-FSK power line carrier
technology over the low voltage electricity distribution network as a communication medium.
The functional reference architecture is shown in Figure 1.

– 10 – 62056-8-3 © IEC:2013
Electricity Metering End Device
Meter application functions
I
Meter communication functions
M
L
NN LN
C Local Network Access Point (LNAP)
N
C
Neigbourhood Network Access Point (NNAP)
WAN
AMI Head End System
IEC  1149/13
Figure 1 – Communication architecture
End devices – typically electricity meters – comprise application functions and communication
functions. They may be connected directly to the NNAP via the C interface, or to an LNAP via
an M interface, while the LNAP is connected to the NNAP via the C interface. The LNAP
function may be co-located with the metering functions.
A NNAP comprises gateway functions and it may comprise concentrator functions. Upstream,
it is connected to the Metering Head End System (HES) using suitable communication media
and protocols.
End devices and LNAPs may communicate to different NNAPs, but to one NNAP only at a
time. From the PLC communication point of view, the NNAP acts as an initiator while end
devices and LNAPs act as responders.
NNAPs and similarly LNAPs may communicate to each other, but this is out of the scope of
this standard, which covers the C interface only.
When the NNAP has concentrator functions, it acts as a COSEM client. When the NNAP has
gateway functions only, then the HES acts as a COSEM client. The end devices or the LNAPs
act as COSEM servers.
62056-8-3 © IEC:2013 – 11 –
5 Reference model
NOTE This clause is partly based on IEC 61334-4-1:1996, Clause 3.
The reference model of the DLMS/COSEM PLC S-FSK communication profile is shown in
Figure 2. It is based on a simplified – or collapsed – three-layer OSI architecture. The layers
are the physical layer, the data link layer and the application layer. The data link layer is split
to the MAC sublayer and the LLC sublayer.
COSEM Application Process
System Management Application Process (SMAP)
IEC 62056-6-1, IEC 62056-6-2
System Management Configuration Initiation ASE
DLMS/COSEM Application layer
Application Entity (CIASE)
ACSE and xDLMS ASE
(SMAE) IEC 61334-4-511
IEC 62056-5-3
IEC 61334-5-1 with extensions
ACSE and xDLMS APDUs
CI-PDUs
carried by
carried by
Connectionless DL-Data and DL-Reply services or
Connectionless DL-Data services
Connection oriented DL-Data services
Data link layer
HDLC based LLC sublayer (CO / CL)
Connectionless LLC sublayer
IEC 62056-46
IEC 61334-4-32
MA-Sync.ind
(ISO/IEC 8802-2 Class I over HDLC)
Credit
management
MA-Data services
S-FSK MAC sub-layer
IEC 61334-5-1 clause 4 with extensions
Phy-AskForRepeaterCall
P-Data services P-Sync services
S-FSK Physical layer
IEC 61334-5-1 clause 3
IEC  1150/13
Figure 2 – The DLMS/COSEM S-FSK PLC communication profile
6 The physical layer (PhL)
The PhL provides the interface between the equipment and the physical transmission medium
that is the distribution network. It transports binary information from the source to the
destination.
– 12 – 62056-8-3 © IEC:2013
The PhL in this profile is as specified in IEC 61334-5-1:2001, Clause 3. It provides the
following services to its service user MAC sublayer:
• P-Data services to transfer MPDUs to (a) peer MAC sublayer entity(ies) using the LV
distribution network as the transport medium;
• P-Sync services to allow the MAC sublayer entity to ask for a new synchronization and to
be informed of a change in the synchronization state of the PL. These services are used
locally by the MAC sublayer.
See IEC 61334-5-1:2001, 3.4.
7 The data link layer
7.1 General
The data link layer consists of two sublayers: the Medium Access Control (MAC) and the
Logical Link Control (LLC) sublayer.
The MAC sublayer handles access to the physical medium and provides physical device
addressing. The decision to access the medium is made by the initiator, directly for its own
MAC sublayer, or indirectly for other MAC sublayers that are requested to transmit a response
to a request sent previously by the initiator.
The LLC sublayer controls the logical links.
There are two LLC sublayer alternatives available:
• the connectionless LLC sublayer, as specified in IEC 61334-4-32;
• the LLC sublayer using the HDLC based data link layer, as specified in IEC 62056-46.
7.2 The MAC sublayer
The MAC sublayer of the DLMS/COSEM S-FSK PLC communication profile is as specified in
IEC 61334-5-1:2001, Clause 4. It provides the following services to its service user LLC
sublayer:
• the MA-Data services. These services allow the LLC sublayer entity to exchange LLC data
units with peer LLC sublayer entities. See IEC 61334-5-1:2001, 4.1.3.1;
• the MA-Sync.indication service. This allows the SMAE entity to be informed of the
synchronization and configuration status of the device. See IEC 61334-5-1:2001, 4.1.3.2.
7.3 The connectionless LLC sublayer
The connectionless LLC sublayer is as specified in IEC 61334-4-32. It is derived from
ISO/IEC 8802-2 – similar to Class III operation – and it performs the following functions:
• addressing of application entities within the equipment;
• sending data with no acknowledgement (SDN);
• reply data on request (RDR).
It provides the following services:
• DL-Data services for transporting CI-PDUs, ACSE APDUs and client-server type xDLMS
APDUs;
• DL-Reply services for asking the remote LLC sublayer entity to send a previously
prepared LSDU;
• DL-Update-Reply services to prepare the LSDUs to be transferred using the DL-Reply
services.
62056-8-3 © IEC:2013 – 13 –
For more details, see IEC 61334-4-32:1996, 2.1.
7.4 The HDLC based LLC sublayer
The HDLC based LLC sublayer is as specified in IEC 62056-46.
As explained in IEC 62056-46:2002, 4.1 and 4.2, this sublayer can also be divided to two
sublayers:
• the LLC sublayer based on ISO/IEC 8802-2. Here, it is used in an extended Class I
operation. The only role of this sublayer is to select the DLMS/COSEM Application layer
by using a specific LLC address. The LLC services are provided by the HDLC based MAC
sublayer;
• the MAC sublayer, based on the HDLC protocol. It provides addressing of application
entities within the equipment.
NOTE In this profile, there are two MAC sublayers. The HDLC MAC sublayer provides reliable LLC data transport
and segmentation. The Medium Access Control functionality is provided by the S-FSK MAC sublayer specified in
7.2.
The HDLC based LLC sublayer provides the following services:
• DL-Connect services to connect and to disconnect the data link layer;
• connectionless DL-Data services for transporting CI-PDUs, ACSE APDUs and xDLMS
APDUs;
• connection oriented DL-Data services for transporting ACSE APDUs and xDLMS APDUs.
These services provide reliable data transport and support segmentation to carry long
messages, in a transparent manner for the application layer.
7.5 Co-existence of the connectionless and the HDLC based LLC sublayers
The frames of the connectionless LLC sublayer and the HDLC based LLC sublayer can be
distinguished from each other as shown in Figure 3. This allows systems using the two
profiles to co-exist on the same network.
Control field DSAP address field SSAP address field
LSB
IEC 61334-4-32
1  C  C  C/R  Q Q Q Q D  D  D  D  D  D  D  D S  S  S  S  S  S  S  S
LLC frame header: MSB = 1
Flag 7E Frame format
LSB
IEC 62056-46
0  1  1  1  1  1  1  0 1  0  1  0  S  L  L  L L  L  L  L  L  L  L  L
Data link layer header: MSB = 0
Legend:
C: Command subfield
C/R: Command / response bit
QQQQ: Qualifier subfield
DDDDDDDD: Destination address
SSSSSSSS: Source address
S: Segmentation
IEC  1151/13
L: Length
Figure 3 – Co-existence of the connectionless and the HDLC based LLC sublayers

– 14 – 62056-8-3 © IEC:2013
8 The application layer (AL)
Concerning the application layer, the DLMS/COSEM Application layer as specified in
IEC 62056-5-3 applies. It provides services to the COSEM application process (AP) and uses
the services of the connectionless or the HDLC based LLC sublayer.
9 The application process (AP)
On the server side, the COSEM device- and object model – as specified in IEC 62056-6-2 –
applies. Each logical device represents an AP.
The client side APs make use of the resources of the server side AP. A physical device may
host one or more client APs.
10 The Configuration Initiation Application Service Element (CIASE)
NOTE This clause is based on IEC 61334-4-511 and constitutes an extension to it.
10.1 Overview
One of the activities of systems management is open system initialisation and / or
modification. This is provided by the Configuration Initiation ASE (CIASE). It is specified in
IEC 61334-4-511 with the extensions specified below.
The CIASE services are the following:
• the Discover service;
• the Register service;
• the PING service;
• the RepeaterCall service; and
• the ClearAlarm service.
The three latter services, together with the Intelligent Search Initiator process specified in
10.7, constitute upper compatible functional extensions to IEC 61334-4-511.
The CIASE uses the connectionless DL-Data services of the LLC sublayer.
10.2 The Discover service
NOTE In this document, the description of the CIASE services follows the presentation style used for the
DLMS/COSEM services. For the notation used, see IEC 62056-5-3:—, 6.1.
The Discover service is used to discover new systems or systems, which are in alarm state. It
is specified in IEC 61334-4-511:2000, 7.1. The Discover service primitives shall provide the
parameters as shown in Table 1.

62056-8-3 © IEC:2013 – 15 –
Table 1 – Service parameters of the Discover service primitives

Discover DiscoverReport
.request .indication .response .confirm
Argument M M (=) – –
Response_Probability M M (=)
Allowed_Time_Slots M M (=)
DiscoverReport_Initial_Credit M M (=)
IC_Equal_Credit M M (=) – –
Result (+) S S (=)
System_Title {System_Title} – – M M (=)
Alarm_Descriptor C C (=)
Result (-) S S (=)
– –
Argument_Error(s) M M (=)
NOTE This Table 1 is included here for completeness and to correct some editorial errors in
IEC 61334-4-511:2000, 7.1. For the description of the service parameters, see the clause referenced here.

10.3 The Register service
The Register service is used to perform system configuration. It assigns a MAC address to a
new system identified by its system title. It is specified in IEC 61334-4-511:2000, 7.2. The
Register service primitives shall provide the parameters as shown in Table 2.
Table 2 – Service parameters of the Register service primitives

.request .indication
Argument
Active_Initiator_System_Title M M (=)
List_Of_Correspondence M M (=)
New_System_Title M M (=)
MAC_Address M M (=)
Result (+) S S
Result (–) S S
Argument_Error(s) M M (=)
NOTE This Table 2 is included here for completeness. For the
description of the service parameters, see IEC 61334-4-511:2000,
7.2.
NOTE 1 If a server in NEW state receives a correct Register service with its own server system title in it, it will be
registered, even if it did not receive a Discover service before.
NOTE 2 Only those servers in the NEW state can be registered.
10.4 The Ping Service
Function
The Ping service is used to check that a server system already registered is still present on
the network. It also allows verifying that the right physical device is linked to the right MAC
address. It also allows preventing the time_out_not_addressed timer to expire.

– 16 – 62056-8-3 © IEC:2013
The process begins with a Ping.request service primitive issued by the active initiator. The
service contains the system title of the physical device pinged. The PingRequest CI-PDU is
carried by a DL-Data.request service primitive and it is sent to the MAC address assigned to
this system and to the server CIASE L-SAP.
If the system title carried by the Ping.indication service primitive is equal to the system title of
the server, the server shall respond with a Ping.response service primitive, carrying the
system title of the server. It is sent to the initiator CIASE L-SAP.
Semantics
The PING service primitives shall provide parameters as shown in Table 3.
Table 3 – Service parameters of the PING service primitives
.request .indication .response .confirm
Argument M M (=) - -
Sys
...