IEC PAS 63256:2020

Industrial communication networks - Broadband fieldbus specification - AUTBUS

IEC PAS 63256:2020(E) defines the broadband fieldbus specification AUTBUS. AUTBUS implements real-time, high reliability and deterministic transmission and application for both industrial fieldbus data and ISO/IEC/IEEE 8802-3 Ethernet data by shared medium bus.
This document explains the structure and content of AUTBUS, and describes the definition and specification of Physical Layer (PhL) protocol / service, Data-link Layer (DLL) protocol / service and Application Layer (AL) protocol / service of AUTBUS

General Information

• Status: Withdrawn
• Publication Date: 09-Jan-2020
• Withdrawal Date: 15-Jun-2023
• ICS: 33.040.40 - Data communication networks
• ICS: 35.240.50 - IT applications in industry
• Technical Committee: SC 65C - Industrial networks
• Current Stage: WPUB - Publication withdrawn
• Start Date: 16-Jun-2023
• Completion Date: 16-Jun-2023

Standards Content (Sample)

IEC PAS 63256 ®
Edition 1.0 2020-01
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
Industrial communication networks – Broadband fieldbus specification – Autbus

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IEC PAS 63256 ®
Edition 1.0 2020-01
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
Industrial communication networks – Broadband fieldbus specification – Autbus

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 00.000 ISBN 978-2-8322-7749-2

– 2 – IEC PAS 62356:2020 © IEC 2020
CONTENTS
FOREWORD . 11
1 Scope . 12
2 Normative references . 12
3 Terms and definitions, abbreviated terms and symbols . 12
3.1 Terms and definitions . 12
3.2 Abbreviated terms . 14
3.3 Symbols . 16
4 Data type . 16
4.1 Overview. 16
4.2 Basic data type . 16
4.2.1 Unsigned type coding (UINT) . 16
4.2.2 Time type coding (TIMEV) . 17
4.2.3 Date type coding (DATE2000) . 17
4.2.4 Time of day type coding (TIMEOFDAY) . 18
4.2.5 Time difference type coding (TIMEDIFFER) . 18
4.2.6 String type coding (STRING) . 18
4.2.7 Bitmap tpye coding (BITMAP) . 19
4.3 Complex type . 19
4.3.1 Struct type coding (STRUCT). 19
4.3.2 Array type coding (ARRAY) . 19
5 AUTBUS overview . 19
5.1 Overview. 19
5.2 AUTBUS protocol stack architecture . 20
5.3 Device type . 22
5.3.1 Overview . 22
5.3.2 Control Device . 22
5.3.3 Field Device . 22
5.3.4 Management Node . 22
5.3.5 Terminal Node . 22
5.4 Network topology . 22
6 System management . 23
6.1 Overview. 23
6.2 System management process . 23
6.3 System management information table . 24
6.3.1 PhL related management information table . 24
6.3.2 DLL related management information table . 31
6.3.3 AL related management information table . 34
7 Physical layer . 36
7.1 Physical Layer overview . 36
7.2 PhL resource . 37
7.2.1 Signal frame . 37
7.2.2 Data subframe . 39
7.2.3 OFDM symbol . 40
7.2.4 Code Block . 41
7.2.5 Resource element . 41
7.2.6 Working mode . 42

IEC PAS 62356:2020 © IEC 2020 – 3 –
7.3 DLL–PhL interface . 44
7.3.1 General . 44
7.3.2 Service primitive . 45
7.3.3 Primitive process . 47
7.4 System management-PhL interface . 47
7.4.1 General . 47
7.4.2 Service primitive . 47
7.4.3 Primitive process . 49
7.5 DCE Independent Sublayer (DIS) . 50
7.5.1 General . 50
7.5.2 Data sequence . 50
7.6 DTE-DCE interface . 51
7.6.1 General . 51
7.6.2 Interface signal . 51
7.6.3 Signal process . 52
7.7 Medium Dependent Sublayer (MDS) . 52
7.7.1 General . 52
7.7.2 MDS specification . 52
7.8 MDS-MAU interface . 59
7.8.1 General . 59
7.8.2 MDS-MAU interface . 59
7.9 Medium Attachment Unit (MAU) . 62
7.9.1 Overview . 62
7.9.2 Electrical specifications . 62
7.9.3 Transmission Medium Interface . 62
7.9.4 Medium . 63
8 Data-link layer . 65
8.1 General . 65
8.1.1 DLL protocol architecture . 65
8.1.2 DLL working mechanism . 67
8.2 DLL services . 70
8.2.1 General . 70
8.2.2 Data-link service model . 71
8.2.3 Data-link service description . 72
8.2.4 Data-link management service description . 85
8.2.5 Clock synchronization service description . 101
8.3 DLL protocol . 107
8.3.1 Working procedure . 107
8.3.2 DLPDU structure . 116
8.3.3 State machine . 129
8.3.4 Error handling . 134
9 Application Layer . 136
9.1 Overview. 136
9.1.1 Protocol architecture . 136
9.1.2 Data type of AL . 137
9.1.3 Data mapping modeling . 140
9.1.4 Communication model . 143
9.2 AL Service . 144
9.2.1 Overview . 144

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9.2.2 Application Service Elements. 145
9.2.3 Application service . 169
9.3 Specification for AL protocol . 171
9.3.1 Overview . 171
9.3.2 Message format . 171
9.3.3 State machine . 176
Annex A (informative) Example of data subframe allocation . 184
A.1 Example A . 184
A.2 Example B . 185
A.3 Example C . 186
Annex B (normative) RS code generating polynomial . 187
Annex C (informative) Example for NodeID and MAC address mapping . 188
Annex D (informative) Example for multicast group working mechanism . 189
Annex E (informative) Example of service data mapping DTU message . 190
Annex F (informative) Example of OPC UA data model and AUTBUS data model
mapping . 191
Annex G (informative) Example of RTA service processing . 192
Annex H (informative) AUTBUS virtualization solution example . 193
Bibliography . 196

Figure 1 – BITMAP data type . 19
Figure 2 – Corresponding relationship between AUTBUS protocol stack and OSI
reference model . 20
Figure 3 – AUTBUS protocol stack architecture . 21
Figure 4 – AUTBUS network topology . 23
Figure 5 – AUTBUS system management process . 24
Figure 6 – Resource block information structure . 31
Figure 7 – AUTBUS Physical Layer model . 37
Figure 8 – AUTBUS SF and OFDM symbol . 38
Figure 9 – SF structure . 39
Figure 10 – Carrier mode A and carrier mode B of data subframe . 40
Figure 11 – OFDM symbol structure of PhL . 40
Figure 12 – OFDM timing structure . 41
Figure 13 – DLPDU and CB . 41
Figure 14 – Resource element schematic diagram . 42
Figure 15 – Mapping between data units across the DLL-PhL interface . 44
Figure 16 – DLL-PhL interface service primitive process . 47
Figure 17 – System management-PhL interface primitive process . 50
Figure 18 – DTE-DCE interface signal process . 52
Figure 19 – PhL channel process . 53
Figure 20 – Scrambling sequence generation . 53
Figure 21 – Convolutional encoder with a code rate of 1/2 . 55
Figure 22 – Bit deletion process with code rates 2/3 and 3/4 . 55
Figure 23 – Generation of m sequence . 57
Figure 24 – OFDM symbol structure diagram . 58

IEC PAS 62356:2020 © IEC 2020 – 5 –
Figure 25 – MDS-MAU interface service process diagram . 60
Figure 26 – Signal spectrum template . 61
Figure 27 – Connector of the shielded twisted pair . 64
Figure 28 – Terminal resistor . 64
Figure 29 – DLL in AUTBUS protocol stack architecture . 65
Figure 30 – Relationship of AUTBUS DLL to other filedbus layers and to users of
AUTBUS DLS . 66
Figure 31 – AUTBUS DLL protocol architecture diagram . 66
Figure 32 – Resource mapping between DLL and PhL . 69
Figure 33 – DLL resource mapping message queue scheduling diagram . 70
Figure 34 – Primitive process of CLMDTA . 73
Figure 35 – Primitive process of CLMDTNA . 75
Figure 36 – Primitive process of CLMDTRA . 77
Figure 37 – Primitive process of CLMDTRRNA . 79
Figure 38 – Primitive process of CMDTA . 81
Figure 39 – Primitive process of CMDTNA . 83
Figure 40 – Data-link config management service primitive process . 86
Figure 41 – TN active logout discovery service primitive process . 90
Figure 42 – Data-link discovery management service primitive sequence diagram . 90
Figure 43 – Local data-link maintenance service primitive process diagram . 93
Figure 44 – Remote data-link maintenance service primitive process diagram . 93
Figure 45 – Data-link establish management service primitive process . 96
Figure 46 – Data-link release management service primitive sequence diagrame . 98
Figure 47 – Data-link update management service primitive sequence diagram . 100
Figure 48 – Delay measurement service primitive process . 102
Figure 49 – Clock synchronization service primitive process . 104
Figure 50 – Clock interrupt service primitive process . 106
Figure 51 – Resource mapping configuration diagram . 108
Figure 52 – Initial access configuration procedure diagram . 109
Figure 53 – The random access configuration procedure diagram . 110
Figure 54 – Node leave procedure diagram . 112
Figure 55 – DLS data sending procedure diagram . 113
Figure 56 – DLS data receiving procedure diagram . 114
Figure 57 – Clock synchronization delay measurement procedure diagram . 115
Figure 58 – Clock register structure diagram . 115
Figure 59 – Clock synchronization procedure . 116
Figure 60 – Universal DLPDU structure . 116
Figure 61 – Basic configuration DLPDU structure. 117
Figure 62 – General configuration block structure . 118
Figure 63 – Address assignment DLPDU structure . 119
Figure 64 – Multicast assignment DLPDU structure. 120
Figure 65 – Resource allocation DLPDU structure . 121
Figure 66 – Access notification DLPDU structure . 122

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Figure 67 – Resource application DLPDU structure. 123
Figure 68 – Resource release DLPDU structure . 124
Figure 69 – Status query DLPDU structure . 125
Figure 70 – Status response DLPDU . 125
Figure 71 – Announcement DLPDU structure . 126
Figure 72 – Clock synchronization DLPDU structure . 128
Figure 73 – Common DLPDU structure . 129
Figure 74 – DLDE state machine . 130
Figure 75 – DLME state machine . 132
Figure 76 – DLCE state machine . 133
Figure 77 – AL in AUTBUS protocol stack architecture . 136
Figure 78 – Relationship of AUTBUS AL to other fieldbus layers and to users of
AUTBUS application service . 136
Figure 79 – Diagram of AUTBUS AL protocol architecture . 137
Figure 80 – Data mapping modeling object structure . 141
Figure 81 – Diagram of mapping data buffers and service data variables . 142
Figure 82 – Diagram of P/S model . 143
Figure 83 – P/S model of PUSH mode . 143
Figure 84 – P/S model of PULL mode . 144
Figure 85 – Diagram of C/S communication model . 144
Figure 86 – RT data transmission model . 147
Figure 87 – Diagram of nRT data request pesponse model . 149
Figure 88 – Diagram of nRT data AP interaction based on C/S communication model . 149
Figure 89 – Diagram of nRT data AP interaction based on P/S communication model . 150
Figure 90 – Time synchronization application interaction pocess . 152
Figure 91 – Time query fow . 153
Figure 92 – Resource AP interaction based on C/S communication model . 155
Figure 93 – Resource ASE local service function Diagram . 155
Figure 94 – NETWORKID identification field structure . 156
Figure 95 – NETWORKID interaction process diagram . 158
Figure 96 – Diagram of MAC mapping table service function. 158
Figure 97 – IP mapping table service function diagram . 159
Figure 98 – AUTBUS AL data message is mapped to IP payload data payload . 159
Figure 99 – AUTBUS AL protocol header and IP protocol header mapping. 160
Figure 100 – IP data message is mapped to valid data of AUTBUS AL data message . 160
Figure 101 – Static configuration initialization process . 163
Figure 102 – Join the network interaction process. 163
Figure 103 – Passively exit the network interaction process . 165
Figure 104 – Actively exit network interaction process . 165
Figure 105 – Diagram of diagnostic object mapping . 166
Figure 106 – Diagram of the logging process . 167
Figure 107 – A physical bus divided into two virtual bus domain diagrams . 167
Figure 108 – Diagram of virtualized AP interaction based on C/S communication model . 169

IEC PAS 62356:2020 © IEC 2020 – 7 –
Figure 109 – Virtualization ASE local implementation diagram . 169
Figure 110 – AL protocol message header structure . 171
Figure 111 – Message structure of multiple DTUs . 173
Figure 112 – Transmission unit message format . 174
Figure 113 – Time service notification message structure . 174
Figure 114 – System management data message format . 176
Figure 115 – Diagram of state transition of publisher state machine . 177
Figure 116 – Diagram of state transition of subscriber state machine . 179
Figure 117 – Diagram of state transition of client state machine. 180
Figure 118 – Diagram of transition state of server state machine . 180
Figure 119 – Diagram of transition state of ALCE state machine . 181
Figure 120 – Diagram of transition state of ALDE state machine . 182
Figure 121 – Diagram of state transition for ALME state machine . 183
Figure A.1 – Resource allocation example A . 184
Figure A.2 – Resource allocation example B . 185
Figure A.3 – Resource allocation example C . 186
Figure D.1 – Multicast working mechanism diagram . 189
Figure E.1 – Data transmission unit message content example . 190
Figure F.1 – OPC UA data model and mapping of AUTBUS data model . 191
Figure G.1 – Example of RTA service processing . 192
Figure H.1 – Diagram of AUTBUS industrial bus service deployment . 193
Figure H.2 – Diagram of networking topology based on the virtualized bus . 193
Figure H.3 – Virtual network topology based on logical business function RT1 . 194

Table 1 – Unsigned type data coding . 16
Table 2 – UINT16 type data coding . 17
Table 3 – TIMEV type data coding . 17
Table 4 – DATE2000 type coding . 17
Table 5 – TIMEOFDAY type coding . 18
Table 6 – TIMEDIFFER type coding . 18
Table 7 – STRING type data coding . 18
Table 8 – Physical device configuration information table . 25
Table 9 – System configuration related information table . 26
Table 10 – PhL synchronization management information table . 27
Table 11 – System diagnosis and maintenance related information table . 28
Table 12 – Physical communication resource management information table . 29
Table 13 – Protocol stack version management information table . 31
Table 14 – Link node management information table . 32
Table 15 – Link timeout management information table . 33
Table 16 – Time management information table . 34
Table 17 – Network management information table . 35
Table 18 – AUTBUS TMs and corresponding parameters . 42
Table 19 – Working mode under carrier mode A . 43

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Table 20 – Working mode under carrier mode B . 44
Table 21 – Ph-Param service primitives and parameters . 45
Table 22 – Ph-Param service primitive parameter description . 45
Table 23 – Ph-Data service primitives and parameters . 45
Table 24 – Ph-Data service primitive parameter description . 46
Table 25 – Ph-Clock-Sync service primitives and parameters . 46
Table 26 – Ph-Clock-Sync service primitive parameter description . 46
Table 27 – Ph-RESET primitives and parameters . 48
Table 28 – Ph-RESET service primitive parameter description . 48
Table 29 – Ph-SET-VALUE primitives and parameters . 48
Table 30 – Ph-SET-VALUE primitive parameter status description . 48
Table 31 – Ph-GET-VALUE service primitives and parameters . 48
Table 32 – Ph-EVENT service primitive and parameters . 49
Table 33 – Ph-SYNC service primitives and parameters . 49
Table 34 – RS code mode . 54
Table 35 – Convolutional code mode . 55
Table 36 – Bit interleaving parameters . 56
Table 37 – OFDM configuration parameters . 57
Table 38 – Modulation Coding Scheme in carrier mode A . 58
Table 39 – Modulation Coding Scheme in carrier mode B . 58
Table 40 – Minimum services at MDS-MAU interface . 59
Table 41 – Allowable constellation diagram errors in different modulation modes . 61
Table 42 – System transmission parameters . 62
Table 43 – Transmission medium interface . 62
Table 44 – NodeID address assignment of AUTBUS DLL . 67
Table 45 – NodeID and MAC address mapping . 68
Table 46 – Members of Multicast Group Mapping Table Description . 68
Table 47 – CLMDTA service primitives and parameters . 74
Table 48 – CLMDTA service primitive parameter description. 74
Table 49 – CLMDTNA service primitives and parameters . 76
Table 50 – CLMDTNA service primitive parameter description . 76
Table 51 – CLMDTRA service primitives and parameters . 78
Table 52 – CLMDTRA service primitive parameter description . 78
Table 53 – CLMDTRRNA service primitives and parameters . 80
Table 54 – CLMDTRRNA service primitive parameter description . 80
Table 55 – CMDTA service primitives and parameters . 82
Table 56 – CMDTA service primitive parameter description . 82
Table 57 – CMDTNA service primitives and parameters . 84
Table 58 – CMDTNA service primitive parameter description . 84
Table 59 – DLS status output value description . 85
Table 60 – Data-link config management service . 86
Table 61 – Data-link config management service primitive parameter description . 86
Table 62 – CFG_PARAM_INFO structure description . 87

IEC PAS 62356:2020 © IEC 2020 – 9 –
Table 63 – TIMEOUT_CFG structure description . 88
Table 64 – GROUP_IDMAP_S structure description . 88
Table 65 – NODEID_MAC_S structure description . 88
Table 66 – COMM_RES_CFG structure description . 89
Table 67 – Data-link discovery service primitives and parameters . 91
Table 68 – Data-link discovery management service primitive parameter description . 91
Table 69 – NODE_MGT_INFO_S structure description . 92
Table 70 – Data-link maintenance service primitives and parameters . 94
Table 71 – Data-link maintenance service primitive parameter description . 94
Table 72 – DIAG_INFO_S structure member parameter description . 94
Table 73 – Data-link establish management service primitives and parameters . 96
Table 74 – Data-link establish management service parameter description . 96
Table 75 – CH_RES_INFO_S structure member description . 97
Table 76 – Data-link release management service primitives and parameters . 98
Table 77 – Data-link release management service primitive parameter description . 99
Table 78 – Data-link update management service primitives and parameters . 100
Table 79 – Data-link update management service primitive parameter description . 100
Table 80 – DLMS status return value description . 101
Table 81 – Delay measurement service primitives and parameters . 102
Table 82 – Delay measurement service primitive parameter description . 103
Table 83 – Clock synchronization service primitives and parameters . 104
Table 84 – Clock synchronization service primitive parameter description . 105
Table 85 – Clock interrupt service primitives and parameters . 106
Table 86 – Clock interrupt service primitive parameter description . 106
Table 87 – DLCSS status return value description . 107
Table 88 – DLDE state transition description . 131
Table 89 – DLME state machine state transition description . 133
Table 90 – DLCE state machine state transition description . 134
Table 91 – Description of time information structure TIMEINFO_S . 138
Table 92 – Description of clock option information structure CLOCK_OPTION_INFO_S . 138
Table 93 – Description of network configuration parameter structure
NETWORK_CFG_PARA_S . 139
Table 94 – Description of MAC mapping table NETWORKID_MAC_MAP_TABLE_S . 139
Table 95 – Description of IP mapping table structure IP_MAP_TABLE_S . 140
Table 96 – Service data mapping table parameter list . 142
Table 97 – Communication models supported by AUTBUS AL ASEs . 145
Table 98 – Application service interface return value list . 145
Table 99 – RT Data service interface parameters. 146
Table 100 – nRT data service interface parameters . 148
Table 101 – Timing service interface parameters . 151
Table 102 – Resource service interface parameters . 154
Table 103 – Addressing service interface parameters . 157
Table 104 – Management service interface parameters . 161

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Table 105 – Virtual service interface parameters . 168
Table 106 – Read service parameters .
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