IEC 62056-6-2:2016

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
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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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 document may involve the use of a patent concerning the
Image transfer procedure.
The IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licenses
either free of charge or under reasonable and non-discriminatory terms and conditions with
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Washington, USA.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. The IEC shall not be held
responsible for identifying any or all such patent rights.

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