IEC 62056-6-2:2023

IEC 62056-6-2 ®
Edition 4.0 2023-09
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 4.0 2023-09
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 978-2-8322-7344-9

– 2 – IEC 62056-6-2:2023  IEC 2023
CONTENTS
FOREWORD . 12
INTRODUCTION . 14
1 Scope . 16
2 Normative references . 16
3 Terms, definitions and abbreviated terms . 18
3.1 Terms and definitions related to the Image transfer process (see 4.4.6) . 19
3.2 Terms and definitions related to the S-FSK PLC setup classes (see 4.10) . 20
3.3 Terms and definitions related to the PRIME NB OFDM PLC setup ICs (see
4.12) . 21
3.4 Terms and definitions related to the ISO/IEC 14908 setup ICs (see 4.18) . 22
3.5 Terms and definitions related to ZigBee® (see 4.15) . 23
3.6 Terms and definitions related to Payment metering interface classes (see
4.6) . 24
3.7 Terms and definitions related to the Arbitrator IC (see 4.5.12) . 28
3.8 Abbreviated terms . 29
4 The COSEM interface classes . 33
4.1 Basic principles . 33
4.1.1 General . 33
4.1.2 Referencing methods . 34
4.1.3 Reserved base_names for special COSEM objects . 35
4.1.4 Class description notation . 35
4.1.5 Common data types . 38
4.1.6 Data formats . 39
4.1.7 The COSEM server model . 44
4.1.8 The COSEM logical device . 45
4.1.9 Information security . 46
4.2 Overview of the COSEM interface classes . 47
4.3 Interface classes for parameters and measurement data . 53
4.3.1 Data (class_id = 1, version = 0) . 53
4.3.2 Register (class_id = 3, version = 0) . 54
4.3.3 Extended register (class_id = 4, version = 0) . 58
4.3.4 Demand register (class_id = 5, version = 0) . 60
4.3.5 Register activation (class_id = 6, version = 0) . 64
4.3.6 Profile generic (class_id = 7, version = 1) . 66
4.3.7 Utility tables (class_id = 26, version = 0) . 72
4.3.8 Register table (class_id = 61, version = 0) . 73
4.3.9 Status mapping (class_id = 63, version = 0) . 76
4.3.10 Compact data (class_id: 62, version: 1) . 77
4.4 Interface classes for access control and management . 85
4.4.1 Overview . 85
4.4.2 Client user identification . 85
4.4.3 Association SN (class_id = 12, version = 4) . 86
4.4.4 Association LN (class_id = 15, version = 3) . 91
4.4.5 SAP assignment (class_id = 17, version = 0) . 98
4.4.6 Image transfer (class_id = 18, version = 0) . 98
4.4.7 Security setup (class_id = 64, version = 1) . 106
4.4.8 Push interface classes and objects . 112

4.4.9 COSEM data protection (class_id = 30, version = 0) . 125
4.4.10 Function control (class_id: 122, version: 0) . 140
4.4.11 Array manager (class_id = 123, version = 0) . 142
4.4.12 Communication port protection (class_id = 124, version = 0) . 147
4.5 Interface classes for time- and event bound control . 150
4.5.1 Clock (class_id = 8, version = 0) . 150
4.5.2 Script table (class_id = 9, version = 0) . 154
4.5.3 Schedule (class_id = 10, version = 0) . 155
4.5.4 Special days table (class_id = 11, version = 0) . 158
4.5.5 Activity calendar (class_id = 20, version = 0) . 160
4.5.6 Register monitor (class_id = 21, version = 0) . 164
4.5.7 Single action schedule (class_id = 22, version = 0) . 165
4.5.8 Disconnect control (class_id = 70, version = 0) . 166
4.5.9 Limiter (class_id = 71, version = 0) . 170
4.5.10 Parameter monitor (class_id = 65, version = 1) . 172
4.5.11 Sensor manager (class_id = 67, version = 0) . 176
4.5.12 Arbitrator (class_id = 68, version = 0) . 180
4.5.13 Modelling examples: tariffication and billing . 184
4.6 Payment metering related interface classes . 186
4.6.1 Overview of the COSEM accounting model . 186
4.6.2 Account (class_id = 111, version = 0) . 188
4.6.3 Credit interface class (class_id = 112, version = 0) . 197
4.6.4 Charge (class_id = 113, version = 0) . 208
4.6.5 Token gateway (class_id = 115, version = 0) . 214
4.7 Interface classes for setting up data exchange via local ports and modems . 216
4.7.1 IEC local port setup (class_id = 19, version = 1) . 216
4.7.2 IEC HDLC setup (class_id = 23, version = 1) . 218
4.7.3 IEC twisted pair (1) setup (class_id = 24, version = 1) . 220
4.7.4 Modem configuration (class_id = 27, version = 1) . 223
4.7.5 Auto answer (class_id = 28, version = 2) . 224
4.7.6 Auto connect (class_id = 29, version = 2) . 228
4.7.7 GPRS modem setup (class_id = 45, version = 0) . 230
4.7.8 GSM diagnostic (class_id: 47, version: 2) . 231
4.7.9 LTE monitoring (class_id: 151, version: 1) . 233
4.8 Interface classes for setting up data exchange via M-Bus . 236
4.8.1 Overview . 236
4.8.2 M-Bus slave port setup (class_id = 25, version = 0) . 237
4.8.3 M-Bus client (class_id = 72, version = 1) . 238
4.8.4 Wireless Mode Q channel (class_id = 73, version = 1) . 242
4.8.5 M-Bus master port setup (class_id = 74, version = 0) . 243
4.8.6 DLMS®/COSEM server M-Bus port setup (class_id = 76, version = 0) . 244
4.8.7 M-Bus diagnostic (class_id = 77, version = 0) . 246
4.9 Interface classes for setting up data exchange over the Internet . 248
4.9.1 TCP-UDP setup (class_id = 41, version = 0) . 248
4.9.2 IPv4 setup (class_id = 42, version = 0) . 250
4.9.3 IPv6 setup (class_id = 48, version = 0) . 253
4.9.4 MAC address setup (class_id = 43, version = 0) . 257
4.9.5 PPP setup (class_id = 44, version = 0) . 257
4.9.6 SMTP setup (class_id = 46, version = 0) . 262

– 4 – IEC 62056-6-2:2023  IEC 2023
4.9.7 NTP setup (class_id = 100, version = 0) . 263
4.10 Interface classes for setting up data exchange using S-FSK PLC. 264
4.10.1 General . 264
4.10.2 Overview . 265
4.10.3 S-FSK Phy&MAC set-up (class_id = 50, version = 1) . 267
4.10.4 S-FSK Active initiator (class_id = 51, version = 0) . 272
4.10.5 S-FSK MAC synchronization timeouts (class_id = 52, version = 0) . 274
4.10.6 S-FSK MAC counters (class_id = 53, version = 0) . 276
4.10.7 IEC 61334-4-32 LLC setup (class_id = 55, version = 1) . 279
4.10.8 S-FSK Reporting system list (class_id = 56, version = 0) . 280
4.11 Interface classes for setting up the LLC layer for ISO/IEC 8802-2 . 281
4.11.1 General . 281
4.11.2 ISO/IEC 8802-2 LLC Type 1 setup (class_id = 57, version = 0) . 281
4.11.3 ISO/IEC 8802-2 LLC Type 2 setup (class_id = 58, version = 0) . 282
4.11.4 ISO/IEC 8802-2 LLC Type 3 setup (class_id = 59, version = 0) . 283
4.12 Interface classes for setting up and managing DLMS®/COSEM narrowband
OFDM PLC profile for PRIME networks . 285
4.12.1 Overview . 285
4.12.2 Mapping of PRIME NB OFDM PLC PIB attributes to COSEM IC
attributes . 286
4.12.3 61334-4-32 LLC SSCS setup (class_id = 80, version = 0) . 288
4.12.4 PRIME NB OFDM PLC Physical layer parameters . 289
4.12.5 PRIME NB OFDM PLC Physical layer counters (class_id = 81, version =

0). 289
4.12.6 PRIME NB OFDM PLC MAC setup (class_id = 82, version = 0) . 290
4.12.7 NB OFDM PLC MAC functional parameters (class_id = 83 version = 0) . 292
4.12.8 PRIME NB OFDM PLC MAC counters (class_id = 84, version = 0). 294
4.12.9 PRIME NB OFDM PLC MAC network administration data (class_id = 85,
version = 0) . 295
4.12.10 PRIME NB OFDM PLC MAC address setup (class_id = 43, version = 0) . 298
4.12.11 PRIME NB OFDM PLC Application identification (class_id = 86, version
= 0). 298
4.13 Interface classes for setting up and managing the DLMS®/COSEM
narrowband OFDM PLC profile for G3-PLC networks . 299
4.13.1 Overview . 299
4.13.2 Mapping of G3-PLC PIB attributes to COSEM IC attributes . 300
4.13.3 G3-PLC MAC layer counters (class_id = 90, version = 1) . 301
4.13.4 G3-PLC MAC setup (class_id = 91, version = 2) . 303
4.13.5 G3-PLC 6LoWPAN adaptation layer setup (class_id = 92, version = 2) . 311
4.14 Interface classes for setting up and managing DLMS®/COSEM HS-PLC
ISO/IEC 12139-1 neighbourhood networks . 318
4.14.1 Overview . 318
4.14.2 HS-PLC ISO/IEC 12139-1 MAC setup (class_id = 140, version = 0) . 318
4.14.3 HS-PLC ISO/IEC 12139-1 CPAS setup (class_id = 141, version = 0) . 320
4.14.4 HS-PLC ISO/IEC 12139-1 IP SSAS setup (class_id = 142, version = 0) . 320
4.14.5 HS-PLC ISO/IEC 12139-1 HDLC SSAS setup (class_id = 143, version =
0). 321
4.15 ZigBee® setup classes . 322
4.15.1 Overview . 322
4.15.2 ZigBee® SAS startup (class_id = 101, version = 0) . 324
4.15.3 ZigBee® SAS join (class_id = 102, version = 0) . 326

4.15.4 ZigBee® SAS APS fragmentation (class_id = 103, version = 0) . 327
4.15.5 ZigBee® network control (class_id = 104, version = 0) . 328
4.15.6 ZigBee® tunnel setup (class_id = 105, version = 0) . 334
4.16 Interface classes for setting up and managing the DLMS®/COSEM profile for
LPWAN networks . 335
4.16.1 General . 335
4.16.2 Generic interface classes . 335
4.16.3 LPWAN specific interface classes . 341
4.17 Interface classes for setting up and managing the DLMS®/COSEM profile for
Wi-SUN networks . 348
4.17.1 Wi-SUN setup (class_id = 95, version 0) . 348
4.17.2 Wi-SUN diagnostic (class_id = 96, version 0) . 352
4.17.3 RPL diagnostic (class_id = 97, version 0) . 356
4.17.4 MPL diagnostic (class_id = 98, version 0) . 358
4.18 Interface classes for setting up and managing the DLMS®/COSEM profile for
ISO/IEC 14908 PLC networks . 360
4.18.1 General . 360
4.18.2 ISO/IEC 14908 identification (class_id = 130, version = 0) . 360
4.18.3 ISO/IEC 14908 protocol setup (class_id = 131, version = 0) . 361
4.18.4 ISO/IEC 14908 protocol status (class_id = 132, version = 0) . 361
4.18.5 ISO/IEC 14908 diagnostic (class_id = 133, version = 0) . 363
5 Previous versions of interface classes . 366
5.1 General . 366
5.1.1 New versions of interface classes . 366
5.1.2 New interface classes . 366
5.1.3 Removal of interface classes . 366
5.2 Previous versions of interface classes – general . 366
5.3 Previous versions of interface classes for parameters and measurement
data . 366
5.3.1 Profile generic (class_id = 7, version = 0) . 366
5.3.2 Compact data (class_id = 62, version = 0) . 370
5.4 Previous versions of interface classes for access control and management . 373
5.4.1 Association SN (class_id = 12, version = 0) . 373
5.4.2 Association SN (class_id = 12, version = 1) . 375
5.4.3 Association SN (class_id = 12, version = 2) . 378
5.4.4 Association SN (Class_id = 12, version =3) . 382
5.4.5 Association LN (class_id = 15, version = 0) . 387
5.4.6 Association LN (class_id = 15, version = 1) . 392
5.4.7 Association LN (class_id = 15, version = 2) . 397
5.4.8 Security setup (class_id = 64, version = 0) . 403
5.4.9 Push Setup (class_id = 40, version = 0) . 405
5.4.10 Push Setup (class_id = 40, version = 1) . 410
5.5 Previous versions of interface classes for time- and event-bound control . 417
5.5.1 Parameter monitor (class_id = 65, version = 0) . 417
5.6 Previous versions of payment metering related interface classes . 418
5.7 Previous versions of interface classes for setting up data exchange via local
ports and modems . 419
5.7.1 IEC local port setup (class_id = 19, version = 0) . 419
5.7.2 IEC HDLC setup, (class_id = 23, version = 0) . 420
5.7.3 IEC twisted pair (1) setup (class_id = 24, version = 0) . 422

– 6 – IEC 62056-6-2:2023  IEC 2023
5.7.4 PSTN modem configuration (class_id = 27, version = 0) . 424
5.7.5 Auto answer (class_id = 28, version = 0) . 426
5.7.6 PSTN auto dial (class_id = 29, version = 0) . 428
5.7.7 Auto connect (class_id = 29, version = 1) . 429
5.7.8 GSM diagnostic (class_id = 47, version = 0) . 431
5.7.9 GSM diagnostic (class_id: 47, version: 1) . 433
5.7.10 LTE monitoring (class_id: 151, version: 0) . 435
5.8 Previous versions of interface classes for setting up data exchange via M-
Bus . 436
5.8.1 M-Bus client (class_id = 72, version = 0) . 436
5.9 Previous versions of interface classes for setting up data exchange over the

internet . 441
5.10 Previous versions of interface classes for data exchange using S-FSK PLC . 441
5.10.1 S-FSK Phy&MAC setup (class_id = 50, version = 0) . 441
5.10.2 S-FSK IEC 61334-4-32 LLC setup (class_id = 55, version = 0) . 446
5.11 Previous versions of interface classes for setting up the LLC layer for
ISO/IEC 8802-2 . 447
5.12 Previous versions of interface classes for setting up and managing
DLMS®/COSEM narrowband OFDM PLC profile for PRIME networks . 447
5.13 Previous versions of interface classes for setting up and managing
DLMS®/COSEM narrowband OFDM PLC profile for G3-PLC networks . 447
5.13.1 Mapping of G3-PLC IB attributes to COSEM IC attributes (Original
version) . 447
5.13.2 G3 NB OFDM PLC MAC layer counters (class_id = 90, version = 0) . 449
5.13.3 G3 NB OFDM PLC MAC setup (class_id = 91, version = 0) . 450
5.13.4 G3 NB OFDM PLC 6LoWPAN adaptation layer setup (class_id = 92,
version = 0) . 454
5.13.5 Mapping of G3-PLC PIB attributes to COSEM IC attributes (previous
version) . 460
5.13.6 G3-PLC MAC setup (class_id = 91, version = 1) . 462
5.13.7 G3-PLC 6LoWPAN adaptation layer setup (class_id = 92, version = 1) . 468
5.14 Previous versions of interface classes for setting up and managing
DLMS®/COSEM HS-PLC ISO/IEC 12139-1 neighbourhood networks . 474
5.15 Previous versions of ZigBee® setup classes . 474
6 Relation to OBIS . 474
6.1 General . 474
6.2 Abstract COSEM objects . 475
6.2.1 Use of value group C . 475
6.2.2 Data of historical billing periods . 476
6.2.3 Billing period values / reset counter entries . 478
6.2.4 Other abstract general purpose OBIS codes . 478
6.2.5 Clock objects (class_id = 8) . 479
6.2.6 Modem configuration and related objects . 479
6.2.7 Script table objects (class_id = 9) . 480
6.2.8 Special days table objects (class_id = 11) . 481
6.2.9 Schedule objects (class_id = 10) . 481
6.2.10 Activity calendar objects (class_id = 20) . 482
6.2.11 Register activation objects (class_id = 6) . 482
6.2.12 Single action schedule objects (class_id = 22) . 482
6.2.13 Register monitor objects (class_id = 21) . 483
6.2.14 Parameter monitor objects (class_id = 65) . 483

6.2.15 Limiter objects (class_id = 71) . 483
6.2.16 Array manager objects (class_id = 123) . 483
6.2.17 Payment metering related objects . 483
6.2.18 IEC local port setup objects (class_id = 19) . 484
6.2.19 Standard readout profile objects (class_id = 7) . 484
6.2.20 IEC HDLC setup objects (class_id = 23) . 485
6.2.21 IEC twisted pair (1) setup objects (class_id = 24) . 485
6.2.22 Objects related to data exchange over M-Bus . 486
6.2.23 Objects to set up data exchange over the Internet . 487
6.2.24 Objects to set up Push Setup (class_id = 40) . 488
6.2.25 Objects for setting up data exchange using S-FSK PLC . 489
6.2.26 Objects for setting up the ISO/IEC 8802-2 LLC layer . 489
6.2.27 Objects for data exchange using narrowband OFDM PLC for PRIME
networks . 490
6.2.28 Objects for data exchange using narrow-band OFDM PLC for G3-PLC
networks . 490
6.2.29 ZigBee® setup objects . 491
6.2.30 Objects for setting up and managing data exchange using ISO/IEC
14908 PLC networks . 491
6.2.31 Objects for data exchange using HS-PLC ISO/IEC 12139-1 ISO/EC
12139-1 networks . 491
6.2.32 Objects for data exchange using Wi-SUN networks . 492
6.2.33 Association objects (class_id = 12, 15) . 492
6.2.34 SAP assignment object (class_id = 17) . 493
6.2.35 COSEM logical device name object . 493
6.2.36 Information security related objects . 493
6.2.37 Image transfer objects (class_id = 18) . 494
6.2.38 Function control objects (class_id = 122) . 494
6.2.39 Communication port protection objects (class_id = 124) . 494
6.2.40 Utility table objects (class_id = 26) . 494
6.2.41 Compact data objects (class_id = 62) . 495
6.2.42 Device ID objects. 495
6.2.43 Metering point ID objects . 496
6.2.44 Parameter changes and calibration objects . 496
6.2.45 I/O control signal objects . 496
6.2.46 Disconnect control objects (class_id = 70) . 496
6.2.47 Arbitrator objects (class_id = 68) . 497
6.2.48 Status of internal control signals objects . 497
6.2.49 Internal operating status objects . 497
6.2.50 Battery entries objects . 498
6.2.51 Power failure monitoring objects . 498
6.2.52 Operating time objects . 499
6.2.53 Environment related parameters objects . 499
6.2.54 Status register objects . 499
6.2.55 Event code objects . 499
6.2.56 Communication port log parameter objects . 500
6.2.57 Consumer message objects . 500
6.2.58 Currently active tariff objects . 500
6.2.59 Event counter objects . 500
6.2.60 Profile entry digital signature objects . 501

– 8 – IEC 62056-6-2:2023  IEC 2023
6.2.61 Profile entry counter objects . 501
6.2.62 Meter tamper event related objects . 501
6.2.63 Error register objects . 502
6.2.64 Alarm register, Alarm filter and Alarm descriptor objects . 502
6.2.65 General list objects . 503
6.2.66 Event log objects (class_id 7) . 503
6.2.67 Inactive objects . 504
6.3 Electricity related COSEM objects . 504
6.3.1 Value group D definitions . 504
6.3.2 ID numbers – Electricity . 504
6.3.3 Billing period values / reset counter entries . 505
6.3.4 Other electricity related general purpose objects . 505
6.3.5 Measurement algorithm . 506
6.3.6 Metering point ID (electricity related) . 508
6.3.7 Electricity related status objects . 508
6.3.8 List objects – Electricity (class_id = 7) . 508
6.3.9 Threshold values . 509
6.3.10 Register monitor objects (class_id = 21) . 510
6.4 Coding of OBIS identifications . 510
Annex A (informative) Additional information on Auto answer and Auto connect ICs . 512
Annex B (informative) Additional information to M-Bus client (class_id = 72, version 1) . 514
Annex C (informative) Additional information on IPv6 setup class (class_id = 48,
version = 0) . 516
C.1 General . 516
C.2 IPv6 addressing . 516
C.3 IPv6 header format . 517
C.4 IPv6 header extensions . 519
C.4.1 Overview . 519
C.4.2 Hop-by-Hop options . 519
C.4.3 Destination options . 520
C.4.4 Routing options . 520
C.4.5 Fragment options . 520
C.4.6 Security options . 520
Annex D (informative) Overview of the narrow-band OFDM PLC technology for PRIME
networks . 521
Annex E (informative) Overview of the narrow-band OFDM PLC technology for G3-
PLC networks . 522
Annex F (informative) Significant technical changes with respect to IEC 62056-6-2,
Edition 3.0:2017 . 523
Bibliography . 524

Figure 1 – The meaning of the definitions concerning the Image . 19
Figure 2 – An interface class and its instances . 34
Figure 3 – The COSEM server model . 44
Figure 4 – Combined metering device . 45
Figure 5 – Overview of the interface classes – Part 1 . 48
Figure 6 – Overview of the interface classes – Part 2 . 49
Figure 7 – Overview of the interface classes – Part 3 . 50

Figure 8 – The time attributes when measuring sliding demand . 60
Figure 9 – The attributes in the case of block demand . 61
Figure 10 – The attributes in the case of sliding demand (number of periods = 3) . 61
Figure 11 – Image transfer process flow chart . 104
Figure 12 – COSEM model of push operation . 113
Figure 13 – Push windows and delays . 115
Figure 14 – COSEM model of data protection . 126
Figure 15 – Example: Read protection_buffer attribute . 128
Figure 16 – Example of managing an array . 143
Figure 17 – The generalized time concept . 151
Figure 18 – State diagram of the Disconnect control IC . 167
Figure 19 – Definition of upper and lower thresholds . 180
Figure 20 – COSEM tariffication model (example) . 185
Figure 21 – COSEM billing model (example) . 185
Figure 22 – Outline Acco
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