IEC 62056-6-2:2016

Electricity metering data exchange - The DLMS/COSEM suite - Part 6-2: COSEM interface classes

IEC 62056-6-2:2016 specifies a model of a meter as it is seen through its communication interface(s). Generic building blocks are defined using object-oriented methods, in the form of interface classes to model meters from simple up to very complex functionality. Annexes A to F (informative) provide additional information related to some interface classes.

Echange de données de comptage de l'électricité - La suite DLMS/COSEM - Partie 6-2: Classes d'interfaces COSEM

L'IEC 62056:2016 spécifie un modèle d'un compteur tel qu'il est vu à travers son/ses interface(s) de communication. Des blocs génériques de base sont définis à l'aide de méthodes orientées objet, sous la forme de classes d'interfaces pour modéliser les compteurs à partir d'une fonctionnalité simple jusqu'à une fonctionnalité très complexe. Les Annexe A à F (informatives) donnent des informations supplémentaires relatives à certaines classes d'interface.

General Information

• Status: Published
• Publication Date: 22-Feb-2016
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 17.240 - Radiation measurements
• ICS: 35.110 - Networking
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 13 - Electrical energy measurement and control
• Drafting Committee: WG 14 - TC 13/WG 14
• Current Stage: DELPUB - Deleted Publication
• Start Date: 06-Sep-2017
• Completion Date: 26-Oct-2025

Relations

• Revises: IEC 62056-6-2:2013 - Electricity metering data exchange - The DLMS/COSEM suite - Part 6-2: COSEM interface classes
• Effective Date: 05-Sep-2023
• Revised: IEC 62056-6-2:2017 - Electricity metering data exchange - The DLMS/COSEM suite - Part 6-2: COSEM interface classes
• Effective Date: 05-Sep-2023

Overview

IEC 62056-6-2:2016 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies the model of an electricity meter as accessed through its communication interface(s). Part of the DLMS/COSEM suite, this standard defines generic building blocks using object-oriented methods, expressed as COSEM interface classes. These interface classes enable modeling of electricity meters ranging from simple to highly complex functionalities, facilitating standardized data exchange. Informative annexes provide supplementary information on selected interface classes.

This standard is pivotal for ensuring interoperability and consistency in electricity metering data exchange, covering diverse communication technologies and protocols as part of meter communication systems. It defines the internal structure of meter objects enabling efficient access, control, and secure data transfer.

Key Topics

• COSEM Interface Classes: The core of IEC 62056-6-2:2016 revolves around defining COSEM interface classes which encapsulate parameters, measurement data, and control functions of electricity meters in a structured, object-oriented manner.

• Object-Oriented Meter Modeling: Meters are modeled as a collection of standardized interface classes, simplifying the representation of complex metering functionalities like registers, profiles, and status mapping.

• Communication Setup: The standard specifies setup classes for various communication methods including IEC local ports, modems, M-Bus, Internet (IPv4, IPv6, TCP-UDP), ZigBee®, S-FSK PLC, PRIME NB OFDM PLC, and G3-PLC networks.

• Time and Event Control: Interface classes for clock synchronization, scripting, scheduling, activity calendars, and control functions (e.g., disconnect control, limiters) ensure flexible management of time- and event-bound metering operations.

• Security and Access Control: COSEM interface classes for association management and security setup are detailed, reinforcing secure authentication and access control mechanisms.

• Data Format and Referencing: The standard outlines referencing methods, data types, and formats including date/time and floating-point formats for consistent data interpretation across systems.

Applications

• Smart Metering Systems: IEC 62056-6-2:2016 is fundamental for designing and implementing smart electricity meters that require standardized data models and communication interfaces to support advanced metering infrastructure (AMI).

• Meter Data Management: Utilities and service providers use the standard to normalize meter data collection, ensuring seamless integration with billing, monitoring, and energy management systems.

• Communication Network Integration: The defined interface classes support multiple communication media and protocols, enabling interoperability in complex metering networks including PLC, wireless, and internet-based communications.

• Security Implementation: Using the standard’s security setup interface classes, manufacturers and utilities can implement robust authentication and secure data exchange protocols compliant with international best practices.

• Device Interoperability Testing: Testing labs and developers use this standard to verify meter compliance, communication consistency, and interoperability across multi-vendor ecosystems.

Related Standards

• IEC 62056 Suite: IEC 62056-6-2 is part of the broader IEC 62056 series on electricity metering data exchange, which includes protocols and formats for meter reading, tariff and load control.

• DLMS User Association Specifications: The DLMS/COSEM standards are also aligned with specifications from the DLMS UA, focusing on interoperability of meter communication systems.

• IEC 61334 Series: For power line communication-related COSEM interface classes such as S-FSK PLC, this standard complements the IEC 61334 series covering distribution automation and communication protocols.

• ISO/IEC 8802 Series: For LAN communication dependencies, especially LLC setup classes in the COSEM interface, ISO/IEC 8802-2 defines logical link control protocols.

• ZigBee® and PRIME: Interface classes standardize working with commercial protocols like ZigBee® for wireless communication and PRIME for narrowband OFDM PLC, ensuring compatibility with these commonly used technologies in smart grids.

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Keywords: IEC 62056-6-2, DLMS/COSEM, electricity metering, electricity data exchange, metering communication interface, COSEM interface classes, smart metering, meter data management, power line communication, IEC standards, smart grid communication, meter security, metering protocols, communication setup classes

Standards Content (Sample)

IEC 62056-6-2 ®
Edition 2.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electricity metering data exchange – The DLMS/COSEM suite –
Part 6-2: COSEM interface classes

Échange des données de comptage de l'électricité – La suite DLMS/COSEM –
Partie 6-2: Classes d'interfaces COSEM

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IEC 62056-6-2 ®
Edition 2.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electricity metering data exchange – The DLMS/COSEM suite –

Part 6-2: COSEM interface classes

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

Partie 6-2: Classes d'interfaces COSEM

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220; 35.110; 91.140.50 ISBN 978-2-8322-3041-1

– 2 – IEC 62056-6-2:2016 © IEC 2016
CONTENTS
FOREWORD . 9
INTRODUCTION . 12
1 Scope . 14
2 Normative references. 14
3 Terms, definitions and abbreviations . 16
3.1 Terms and definitions related to the Image transfer process (see 5.3.6) . 16
3.2 Terms and definitions related to the S-FSK PLC setup classes (see 5.8) . 17
3.3 Terms and definitions related to the PRIME NB OFDM PLC setup ICs
(see 5.10) . 18
3.4 Terms and definitions related to ZigBee® (see 5.12) . 20
3.5 Abbreviations . 22
4 Basic principles . 26
4.1 General . 26
4.2 Referencing methods . 27
4.3 Reserved base_names for special COSEM objects . 27
4.4 Class description notation . 27
4.5 Common data types . 30
4.6 Data formats . 31
4.6.1 Date and time formats . 31
4.6.2 Floating point number formats . 33
4.7 The COSEM server model . 35
4.8 The COSEM logical device . 36
4.8.1 General . 36
4.8.2 COSEM logical device name (LDN) . 36
4.8.3 The “association view” of the logical device . 36
4.8.4 Mandatory contents of a COSEM logical device . 37
4.8.5 Management logical device . 37
4.9 Information security . 37
5 The COSEM interface classes . 38
5.1 Overview. 38
5.2 Interface classes for parameters and measurement data . 42
5.2.1 Data (class_id = 1, version = 0) . 42
5.2.2 Register (class_id = 3, version = 0) . 42
5.2.3 Extended register (class_id = 4, version = 0) . 46
5.2.4 Demand register (class_id = 5, version = 0) . 47
5.2.5 Register activation (class_id = 6, version = 0) . 50
5.2.6 Profile generic (class_id = 7, version = 1) . 52
5.2.7 Utility tables (class_id = 26, version = 0). 57
5.2.8 Register table (class_id = 61, version = 0) . 58
5.2.9 Status mapping (class_id = 63, version = 0) . 60
5.3 Interface classes for access control and management . 61
5.3.1 Overview . 61
5.3.2 Client user identification . 61
5.3.3 Association SN (class_id = 12, version = 3) . 62
5.3.4 Association LN (class_id = 15, version = 2) . 66
5.3.5 SAP assignment (class_id = 17, version = 0) . 72

5.3.6 Image transfer . 72
5.3.7 Security setup (class_id = 64, version = 0) . 79
5.3.8 Push interface classes and objects . 81
5.4 Interface classes for time- and event bound control . 87
5.4.1 Clock (class_id = 8, version = 0) . 87
5.4.2 Script table (class_id = 9, version = 0) . 90
5.4.3 Schedule (class_id = 10, version = 0) . 91
5.4.4 Special days table (class_id = 11, version = 0) . 94
5.4.5 Activity calendar (class_id = 20, version = 0) . 95
5.4.6 Register monitor (class_id = 21, version = 0) . 98
5.4.7 Single action schedule (class_id = 22, version = 0) . 100
5.4.8 Disconnect control (class_id = 70, version = 0) . 101
5.4.9 Limiter (class_id = 71, version = 0) . 103
5.4.10 Parameter monitor (class_id = 65, version = 0) . 106
5.4.11 Sensor manager interface class. 107
5.5 Interface classes for setting up data exchange via local ports and modems . 111
5.5.1 IEC local port setup (class_id = 19, version = 1) . 111
5.5.2 IEC HDLC setup (class_id = 23, version = 1) . 112
5.5.3 IEC twisted pair (1) setup (class_id = 24, version = 1) . 114
5.5.4 Modem configuration (class_id = 27, version = 1) . 117
5.5.5 Auto answer (class_id = 28, version = 2) . 118
5.5.6 Auto connect (class_id = 29, version = 2) . 121
5.5.7 GPRS modem setup (class_id = 45, version = 0) . 123
5.5.8 GSM diagnostic (class_id = 47, version = 0) . 124
5.6 Interface classes for setting up data exchange via M-Bus . 126
5.6.1 M-Bus slave port setup (class_id = 25, version = 0) . 126
5.6.2 M-Bus client (class_id = 72, version = 1) . 127
5.6.3 Wireless Mode Q channel (class_id = 73, version = 1) . 132
5.6.4 M-Bus master port setup (class_id = 74, version = 0) . 133
5.7 Interface classes for setting up data exchange over the Internet . 133
5.7.1 TCP-UDP setup (class_id = 41, version = 0) . 133
5.7.2 IPv4 setup (class_id = 42, version = 0) . 134
5.7.3 IPv6 setup (class_id = 48, version = 0) . 137
5.7.4 MAC address setup (class_id = 43, version = 0) . 140
5.7.5 PPP setup (class_id = 44, version = 0) . 141
5.7.6 SMTP setup (class_id = 46, version = 0) . 145
5.8 Interface classes for setting up data exchange using S-FSK PLC . 146
5.8.1 General . 146
5.8.2 Overview . 146
5.8.3 S-FSK Phy&MAC set-up (class_id = 50, version = 1) . 149
5.8.4 S-FSK Active initiator (class_id = 51, version = 0) . 153
5.8.5 S-FSK MAC synchronization timeouts (class_id = 52, version = 0) . 155
5.8.6 S-FSK MAC counters (class_id = 53, version = 0) . 157
5.8.7 IEC 61334-4-32 LLC setup (class_id = 55, version = 1) . 160
5.8.8 -FSK Reporting system list (class_id = 56, version = 0) . 161
5.9 Interface classes for setting up the LLC layer for ISO/IEC 8802-2 . 162
5.9.1 General . 162
5.9.2 ISO/IEC 8802-2 LLC Type 1 setup (class_id = 57, version = 0) . 162
5.9.3 ISO/IEC 8802-2 LLC Type 2 setup (class_id = 58, version = 0) . 163

– 4 – IEC 62056-6-2:2016 © IEC 2016
5.9.4 ISO/IEC 8802-2 LLC Type 3 setup (class_id = 59, version = 0) . 164
5.10 Interface classes for setting up and managing DLMS/COSEM narrowband
OFDM PLC profile for PRIME networks . 166
5.10.1 Overview . 166
5.10.2 Mapping of PRIME NB OFDM PLC PIB attributes to COSEM IC
attributes . 167
5.10.3 61334-4-32 LLC SSCS setup (class_id = 80, version = 0) . 169
5.10.4 PRIME NB OFDM PLC Physical layer parameters . 170
5.10.5 PRIME NB OFDM PLC Physical layer counters (class_id = 81, version =
0) . 170
5.10.6 PRIME NB OFDM PLC MAC setup (class_id = 82, version = 0) . 171
5.10.7 PRIME NB OFDM PLC MAC functional parameters (class_id = 83
version = 0) . 172
5.10.8 PRIME NB OFDM PLC MAC counters (class_id = 84, version = 0) . 174
5.10.9 PRIME NB OFDM PLC MAC network administration data (class_id = 85,
version = 0) . 175
5.10.10 PRIME NB OFDM PLC MAC address setup (class_id = 43, version = 0) . 177
5.10.11 PRIME NB OFDM PLC Application identification (class_id = 86, version
= 0) . 177
5.11 Interface classes for setting up and managing the DLMS/COSEM
narrowband OFDM PLC profile for G3-PLC networks . 178
5.11.1 Overview . 178
5.11.2 Mapping of G3-PLC PIB attributes to COSEM IC attributes . 179
5.11.3 G3-PLC MAC layer counters (class_id = 90, version = 1) . 180
5.11.4 G3-PLC MAC setup (class_id = 91, version = 1) . 181
5.11.5 G3-PLC 6LoWPAN adaptation layer setup (class_id = 92, version = 1) . 187
5.12 ZigBee® setup classes . 192
5.12.1 Overview . 192
5.12.2 ZigBee® SAS startup (class_id = 101, version = 0) . 194
5.12.3 ZigBee® SAS join (class_id = 102, version = 0) . 196
5.12.4 ZigBee® SAS APS fragmentation (class_id = 103, version = 0) . 197
5.12.5 ZigBee® network control (class_id = 104, version = 0) . 198
5.12.6 ZigBee® tunnel setup (class_id = 105, version = 0) . 204
5.13 Maintenance of the interface classes . 205
5.13.1 New versions of interface classes . 205
5.13.2 New interface classes . 205
5.13.3 Removal of interface classes . 205
6 Relation to OBIS . 206
6.1 General . 206
6.2 Abstract COSEM objects . 206
6.2.1 Use of value group C . 206
6.2.2 Data of historical billing periods . 207
6.2.3 Billing period values / reset counter entries . 209
6.2.4 Other abstract general purpose OBIS codes . 209
6.2.5 Clock objects (class_id = 8) . 210
6.2.6 Modem configuration and related objects . 210
6.2.7 Script table objects (class_id = 9) . 210
6.2.8 Special days table objects (class_id = 11) . 211
6.2.9 Schedule objects (class_id = 10) . 211
6.2.10 Activity calendar objects (class_id = 20) . 211

6.2.11 Register activation objects (class_id = 6) . 212
6.2.12 Single action schedule objects (class_id = 22) . 212
6.2.13 Register monitor objects (class_id = 21) . 212
6.2.14 Parameter monitor objects (class_id = 65) . 212
6.2.15 Limiter objects (class_id = 71) . 212
6.2.16 IEC local port setup objects (class_id = 19) . 213
6.2.17 Standard readout profile objects (class_id = 7) . 213
6.2.18 IEC HDLC setup objects (class_id = 23) . 213
6.2.19 IEC twisted pair (1) setup objects (class_id =24) . 213
6.2.20 Objects related to data exchange over M-Bus . 214
6.2.21 Objects to set up data exchange over the Internet . 215
6.2.22 Objects for setting up data exchange using S-FSK PLC . 216
6.2.23 Objects for setting up the ISO/IEC 8802-2 LLC layer . 216
6.2.24 Objects for data exchange using narrowband OFDM PLC for PRIME
networks . 217
6.2.25 Objects for data exchange using narrow-band OFDM PLC for G3-PLC
networks . 218
6.2.26 ZigBee® setup objects . 218
6.2.27 Association objects (class_id = 12, 15) . 218
6.2.28 SAP assignment object (class_id = 17) . 218
6.2.29 COSEM logical device name object . 219
6.2.30 Information security related objects . 219
6.2.31 Image transfer objects (class_id = 18) . 219
6.2.32 Utility table objects (class_id = 26) . 219
6.2.33 Device ID objects . 220
6.2.34 Metering point ID objects . 220
6.2.35 Parameter changes and calibration objects . 221
6.2.36 I/O control signal objects . 221
6.2.37 Disconnect control objects (class_id = 70) . 221
6.2.38 Status of internal control signals objects . 221
6.2.39 Internal operating status objects . 222
6.2.40 Battery entries objects . 222
6.2.41 Power failure monitoring objects . 222
6.2.42 Operating time objects . 223
6.2.43 Environment related parameters objects . 223
6.2.44 Status register objects . 223
6.2.45 Event code objects . 224
6.2.46 Communication port log parameter objects . 224
6.2.47 Consumer message objects . 224
6.2.48 Currently active tariff objects . 224
6.2.49 Event counter objects . 224
6.2.50 Meter tamper event related objects . 225
6.2.51 Error register objects . 225
6.2.52 Alarm register, Alarm filter and Alarm descriptor objects . 226
6.2.53 General list objects . 226
6.2.54 Event log objects . 227
6.2.55 Inactive objects . 227
6.3 Electricity related COSEM objects . 227
6.3.1 Value group D definitions . 227

– 6 – IEC 62056-6-2:2016 © IEC 2016
6.3.2 Electricity ID numbers . 227
6.3.3 Billing period values / reset counter entries . 228
6.3.4 Other electricity related general purpose objects . 228
6.3.5 Measurement algorithm . 229
6.3.6 Metering point ID (electricity related) . 231
6.3.7 Electricity related status objects . 231
6.3.8 List objects – Electricity (class_id = 7) . 231
6.3.9 Threshold values . 232
6.3.10 Register monitor objects (class_id = 21) . 232
6.4 Coding of OBIS identifications . 233
7 Previous versions of interface classes . 234
7.1 General . 234
7.2 Profile generic (class_id = 7, version = 0) . 234
7.3 Association SN (class_id = 12, version = 0) . 237
7.4 Association SN (class_id = 12, version = 1) . 239
7.5 Association SN (class_id = 12, version = 2) . 242
7.6 Association LN (class_id = 15, version = 0) . 245
7.7 Association LN (class_id = 15, version = 1) . 250
7.8 IEC local port setup (class_id = 19, version = 0) . 255
7.9 IEC HDLC setup, (class_id = 23, version = 0) . 256
7.10 IEC twisted pair (1) setup (class_id = 24, version = 0) . 258
7.11 PSTN modem configuration (class_id = 27, version = 0) . 259
7.12 Auto answer (class_id = 28, version = 0) . 261
7.13 PSTN auto dial (class_id = 29, version = 0) . 262
7.14 Auto connect (class_id = 29, version = 1). 263
7.15 S-FSK Phy&MAC setup (class_id = 50, version = 0) . 265
7.16 S-FSK IEC 61334-4-32 LLC setup (class_id = 55, version = 0) . 268
7.17 M-Bus client (class_id = 72, version = 0) . 269
7.18 G3 NB OFDM PLC MAC layer counters (class_id = 90, version = 0) . 274
7.19 G3 NB OFDM PLC MAC setup (class_id = 91, version = 0) . 275
7.20 G3 NB OFDM PLC 6LoWPAN adaptation layer setup (class_id = 92, version
= 0) . 279
Annex A (informative) Additional information on Auto answer and Auto connect ICs . 285
Annex B (informative) Additional information to M-Bus client (class_id = 72, version 1) . 287
Annex C (informative) Additional information on IPv6 setup class (class_id = 48,
version = 0) . 289
C.1 General . 289
C.2 IPv6 addressing . 289
C.3 IPv6 header format . 291
C.4 IPv6 header extensions . 292
C.4.1 Overview . 292
C.4.2 Hop-by-Hop options . 293
C.4.3 Destination options . 293
C.4.4 Routing options . 293
C.4.5 Fragment options . 293
C.4.6 Security options . 294
Annex D (informative) Overview of the narrow-band OFDM PLC technology for
PRIME networks . 295

Annex E (informative) Overview of the narrow-band OFDM PLC technology for G3-
PLC networks . 296
Annex F (informative) Significant technical changes with respect to IEC 62056-6-
2:2013 . 297
Bibliography . 299
Index . 301

Figure 1 – Meaning of the definitions concerning the Image . 17
Figure 2 – An interface class and its instances . 26
Figure 3 – The COSEM server model . 35
Figure 4 – Combined metering device . 36
Figure 5 – Overview of the interface classes – Part 1 . 38
Figure 6 – Overview of the interface classes – Part 2 . 39
Figure 7 – The time attributes when measuring sliding demand . 47
Figure 8 – The attributes in the case of block demand . 47
Figure 9 – The attributes in the case of sliding demand (number of periods = 3) . 48
Figure 10 – Image transfer process flow chart . 78
Figure 11 – COSEM model of push operation . 82
Figure 12 – Push windows and delays . 83
Figure 13 – The generalized time concept . 88
Figure 14 – State diagram of the Disconnect control IC . 101
Figure 15 – Definition of upper and lower thresholds . 110
Figure 16 – Object model of DLMS/COSEM servers . 147
Figure 17 – Object model of DLMS/COSEM servers . 166
Figure 18 – Example of a ZigBee® network . 193
Figure 19 – Data of historical billing periods – example with module 12, VZ = 5 . 208
Figure A.1 – Network connectivity example for a GSM/GPRS network . 285
Figure B.1 – Encryption key status diagram . 287
Figure C.1 – IPv6 address formats . 290
Figure C.2 – IPv6 header format . 291
Figure C.3 – Traffic class parameter format . 291

Table 1 – Reserved base_names for SN referencing . 27
Table 2 – Common data types . 30
Table 3 – List of interface classes by class_id . 40
Table 4 – Enumerated values for physical units . 44
Table 5 – Examples for scaler_unit . 46
Table 6 – Encoding of selective access parameters with data_index . 87
Table 7 – Schedule . 91
Table 8 – Special days table . 92
Table 9 – Disconnect control IC – states and state transitions . 102
Table 10 – Explicit presentation of threshold value arrays . 111
Table 11 – Explicit presentation of action_sets . 111
Table 12 – ADS address elements . 116

– 8 – IEC 62056-6-2:2016 © IEC 2016
Table 13 – Fatal error register . 116
Table 14 – Mapping IEC 61334-4-512:2001 MIB variables to COSEM IC attributes /
methods . 148
Table 15 – MAC addresses in the S-FSK profile . 153
Table 16 – Mapping of PRIME NB OFDM PLC PIB attributes to COSEM IC attributes . 167
Table 17 – Mapping of G3-PLC IB attributes to COSEM IC attributes . 179
Table 18 – Use of ZigBee® setup COSEM interface classes . 194
Table 19 – Use of value group C for abstract objects in the COSEM context . 207
Table 20 – Representation of various values by appropriate ICs . 227
Table 21 – Measuring algorithms – enumerated values . 230
Table 22 – Threshold objects, electricity . 232
Table 23 – Register monitor objects, electricity . 233
Table B.1 – Encryption key is preset in the slave and cannot be changed . 288
Table B.2 – Encryption key is preset in the slave and new key is set after installation . 288
Table B.3 – Encryption key is not preset in the slave, but can be set, case a) . 288
Table B.4 – Encryption key is not preset in the slave, but can be set, case b) . 288
Table C.1 – IPv6 header vs. IPv6 IC . 292
Table C.2 – Optional IPv6 header extensions vs. IPv6 IC . 292

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING DATA EXCHANGE –
THE DLMS/COSEM SUITE –
Part 6-2: COSEM interface classes

FOREWORD
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