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GB/T 42019-2022 English PDF

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GB/T 42019-2022EnglishRFQ ASK 3 days [Need to translate] AUTBUS broadband industrial fieldbus based on time-sensitive technology - System architecture and communication specification Valid GB/T 42019-2022

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GB/T 41295.3   GB/T 41295.2   GB/T 41295.4   GB/Z 42023.1   GB/T 42026   

Basic data

Standard ID GB/T 42019-2022 (GB/T42019-2022)
Description (Translated English) AUTBUS broadband industrial fieldbus based on time-sensitive technology - System architecture and communication specification
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard N10
Classification of International Standard 25.040
Word Count Estimation 202,278
Date of Issue 2022-10-12
Date of Implementation 2023-05-01
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 42019-2022: AUTBUS broadband industrial fieldbus based on time-sensitive technology - System architecture and communication specification


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AUTBUS boradband industrial fieldbus based on time-sensitive technology - System architecture and communication specification ICS 25.040 CCSN10 National Standards of People's Republic of China Broadband Industrial Bus Based on Time Sensitive Technology AUTBUS system architecture and communication specification Released on 2022-10-12 2023-05-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface Ⅺ 1 Scope 1 2 Normative references 1 3 Terms and Definitions, Abbreviations, Symbols, Conventions 1 3.1 Terms and Definitions 1 3.2 Abbreviations 3 3.3 Symbol 5 3.4 Convention 5 3.4.1 General Conventions 5 3.4.2 Primitives 5 3.4.3 State machine description 6 4 data type 7 4.1 Overview 7 4.2 Basic data types 7 4.2.1 Signed integer (INT) encoding 7 4.2.2 Unsigned integer (UINT) encoding 8 4.2.3 Floating point (FLOAT) type encoding 8 4.2.4 Time (TIMEV) type encoding 9 4.2.5 Date (TIMEDATE) type encoding 10 4.2.6 Time (TIMEOFDAY) Type Encoding 11 4.2.7 Time difference (TIMEDIFFER) type encoding 11 4.2.8 Character string (STRING) type encoding 11 4.2.9 Bitmap (BITMAP) type encoding 12 4.3 Composite data types 12 4.3.1 Structure (STRUCT) type encoding 12 4.3.2 Array (ARRAY) type encoding 12 5 System Architecture 12 5.1 Overview 12 5.2 Network Topology 13 5.3 Protocol Stack Architecture 14 6 System Administration 16 6.1 Overview 16 6.2 System management process 16 6.3 System Management Information Base 17 6.3.1 Overview 17 6.3.2 Device Configuration Information Table 17 6.3.3 Working Mode Information Table 18 6.3.4 Synchronization Management Information Table 20 6.3.5 System Diagnosis and Maintenance Information Table 21 6.3.6 Communication resource management information table 22 6.3.7 Link node management information table 24 6.3.8 Link timeout management information table 25 6.3.9 Time Management Information Table 27 6.3.10 Network management information table 28 7 physical layer 29 7.1 Overview of the physical layer 29 7.2 Physical Layer Resources 31 7.2.1 Signal frame 31 7.2.2 OFDM symbols 33 7.2.3 Code block 34 7.2.4 Resource elements 35 7.2.5 Working mode 35 7.3 DLL-PhL interface 37 7.3.1 Overview 37 7.3.2 Service primitives 38 7.4 System Administration - PhL Interface 41 7.4.1 Overview 41 7.4.2 Service primitives 41 7.5 DTE-DCE interface 45 7.5.1 Overview 45 7.5.2 Data serialization 46 7.5.3 Interface signals 46 7.5.4 Signal process 46 7.6 MDS Media Dependent Sublayer 47 7.6.1 Overview 47 7.6.2 MDS sublayer specification 47 7.7 MDS-MAU interface 53 7.7.1 Overview 53 7.7.2 MDS-MAU interface 53 7.8 Media accessory unit 54 7.8.1 Overview 54 7.8.2 Electrical Specifications 55 7.8.3 Emission specifications 55 7.8.4 Media 56 8 Data Link Layer 58 8.1 Data Link Layer Protocol Architecture 58 8.2 Working Mechanism of Data Link Layer 59 8.2.1 Node 59 8.2.2 Addressing 59 8.2.3 Multicast 60 8.2.4 Resource Mapping and Scheduling 60 8.3 Data Link Layer Services 62 8.3.1 Overview 62 8.3.2 Data link services 63 8.3.3 Data Link Management Service 77 8.3.4 Clock synchronization service 94 8.4 Data Link Layer Protocols 100 8.4.1 Work process 100 8.4.2 DLPDU structure 109 8.4.3 State machine description 120 8.4.4 Error handling 125 9 Application layer 126 9.1 Application Layer Protocol Architecture 126 9.2 Application layer data types 126 9.2.1 Time information structure 126 9.2.2 Clock option structure 127 9.2.3 Network configuration parameter structure 127 9.2.4 MAC mapping table structure 128 9.2.5 IP mapping table structure 128 9.3 Data Object Model 129 9.4 Application Layer Communication Model 131 9.4.1 Overview 131 9.4.2 P/S 131 9.4.3 C/S 132 9.5 Application Layer Services 132 9.5.1 Overview 132 9.5.2 Application Service Element ASE 133 9.5.3 Application Services 156 9.6 Application layer protocol specification 157 9.6.1 Overview 157 9.6.2 ALPDU structure 157 9.6.3 State Machine 163 Appendix A (informative) Data subframe example 170 A.1 Example A 170 A.2 Example B 170 A.3 Example C 171 Appendix B (Normative) RS Code Generator Polynomial Coefficients 173 Appendix C (informative) NodeID and MAC address mapping table structure and example 174 Appendix D (Informative) Example of Multicast Mapping Table Structure and Multicast Working Mechanism 175 Appendix E (informative) OPCUA data model and AUTBUS data model correspondence example 176 Appendix F (Informative) Service Data Mapping Data Transmission Unit Message Example 177 Appendix G (informative) Example of AUTBUS bus virtualization scheme 178 Appendix H (informative) Recommendations for steel industry applications based on AUTBUS specifications 181 H.1 Industrial Communication Requirements in the Iron and Steel Industry 181 H.2 Steel industry application system architecture based on AUTBUS specification 181 H.3 Steel industry network architecture based on AUTBUS specification 182 H.4 Application effect of steel industry based on AUTBUS specification 183 Appendix I (Informative) Oil and Gas Industry Application Recommendations Based on AUTBUS Specifications 185 References 187 Figure 1 Schematic diagram of state machine 6 Figure 2 Schematic diagram of BITMAP data type 12 Figure 3 AUTBUS linear bus network topology13 Figure 4 AUTBUS ring bus network topology 13 Figure 5 Correspondence between AUTBUS protocol stack model and OSI layers14 Figure 6 AUTBUS protocol stack architecture 15 Figure 7 AUTBUS system management flow chart 16 Figure 8 Schematic diagram of resource block information structure 24 Figure 9 Schematic diagram of AUTBUS physical layer model 30 Figure 10 AUTBUS signal frame and OFDM symbol 31 Figure 11 Signal frame structure 32 Figure 12 Bearer mode A and bearer mode B of data subframe 33 Figure 13 Physical layer OFDM symbol structure 34 Figure 14 OFDM_Timing structure 34 Figure 15 Data link layer protocol data unit and code block 34 Figure 16 Schematic diagram of resource elements 35 Figure 17 Mapping between data units on the DLL-PhL interface 38 Figure 18 Ph-Param service process 39 Figure 19 Ph-Data service process 40 Figure 20 Ph-Clock-Sync service process 41 Figure 21 Ph-RESET service process 42 Figure 22 Ph-SET-VALUE service process 43 Figure 23 Ph-GET-VALUE service process 44 Figure 24 Ph-EVENT service process 44 Figure 25 Ph-SYNC service process 45 Figure 26 Schematic diagram of DTE-DCE interface signal process 47 Figure 27 MDS sublayer process 47 Figure 28 Schematic diagram of the scrambling sequence generation process 48 Figure 29 Return-to-zero convolutional encoder with code rate 1/2 49 Figure 30 Code rate 3/4 bit deletion process 50 Figure 31 Code rate 2/3 bit erasure process 50 Figure 32 Generation of m-sequence 51 Figure 33 OFDM symbol structure diagram 52 Figure 34 Schematic diagram of MDS-MAU interface service process 54 Figure 35 Signal Spectrum Template 55 Figure 36 Twisted pair connector 57 Figure 37 Coaxial cable connector 58 Figure 38 Schematic diagram of terminal resistors connected at both ends of the twisted pair 58 Figure 39 AUTBUSDLL protocol architecture 59 Figure 40 Schematic diagram of DLL and PhL resource mapping 61 Figure 41 Schematic diagram of DLL message queue scheduling 62 Figure 42 Schematic diagram of CLMA service process 65 Figure 43 Schematic diagram of CLMNA service process 67 Figure 44 Schematic Diagram of CLMRA Service Process 69 Figure 45 Schematic diagram of CLMRRNA service process 71 Figure 46 Schematic diagram of CMA service process 73 Figure 47 Schematic diagram of CMNA service process 75 Figure 48 Schematic diagram of data link configuration management service process 77 Figure 49 Schematic diagram of the terminal node active discovery management service process 82 Figure 50 Schematic diagram of terminal node passive discovery management service process 82 Figure 51 Schematic Diagram of Local Data Link Maintenance and Management Service Process 85 Figure 52 Schematic diagram of remote data link maintenance management service process 85 Figure 53 Schematic diagram of data link creation management service process 88 Figure 54 Schematic diagram of data link release management service process 90 Figure 55 Schematic diagram of data link update management service process 92 Figure 56 Schematic diagram of delay measurement service process 95 Figure 57 Schematic diagram of clock synchronization service process 97 Figure 58 Schematic diagram of clock interrupt service process 99 Figure 59 Schematic diagram of resource mapping configuration 101 Figure 60 Schematic diagram of initial access configuration process 102 Figure 61 Schematic diagram of random access process 103 Figure 62 Schematic diagram of node exit process 105 Figure 63 Schematic diagram of data link layer service data sending process 106 Figure 64 Schematic diagram of data link layer service data receiving process 107 Figure 65 Schematic diagram of clock synchronization delay measurement process 108 Figure 66 Schematic diagram of clock register structure 108 Figure 67 Schematic diagram of clock synchronization process 109 Figure 68 General DLPDU structure 109 Figure 69 Basic configuration DLPDU structure 110 Figure 70 General configuration structure 111 Figure 71 Identification allocation DLPDU structure 112 Figure 72 Multicast distribution DLPDU structure 112 Figure 73 Resource allocation DLPDU structure 113 Figure 74 Access Advertisement DLPDU Structure 114 Figure 75 Resource application DLPDU structure 115 Figure 76 Resource release DLPDU structure 116 Figure 77 Status query DLPDU structure 117 Figure 78 Status response DLPDU structure 117 Figure 79 Core configuration DLPDU structure 118 Figure 80 Clock synchronization DLPDU structure 119 Figure 81 Data DLPDU structure 120 Figure 82 DLDE state machine 121 Figure 83 DLME state machine 123 Figure 84 DLCE state machine 124 Figure 85 Schematic diagram of AUTBUS application layer protocol architecture 126 Figure 86 Application process object data model 129 Figure 87 Schematic diagram of data buffer structure 130 Figure 88 Schematic diagram of P/S model 131 Figure 89 P/S model of PUSH mode 132 Figure 90 P/S model of PULL mode 132 Figure 91 Schematic diagram of C/S communication model 132 Figure 92 Real-time data service interaction process 135 Figure 93 Real-time aperiodic data interaction process 136 Figure 94 Schematic diagram of non-real-time data request response model 137 Figure 95 Schematic diagram of establishment of non-real-time data channel based on C/S communication model 138 Figure 96 Schematic diagram of non-real-time data application process interaction based on P/S communication model 138 Figure 97 Time synchronization application interaction process 140 Figure 98 Time query service interaction process 140 Figure 99 Resource application process based on C/S communication model 142 Figure 100 Schematic diagram of resource ASE local service function 143 Figure 101 NAOID field structure 143 Figure 102 Schematic diagram of NAOID interaction process 145 Figure 103 Schematic diagram of IP mapping table interaction process 146 Figure 104 AUTBUSAL data packet is mapped to IP payload 146 Figure 105 AUTBUSAL protocol packet header and IP protocol packet header mapping 147 Figure 106 IP data packets are mapped to valid data of AUTBUS application layer data packets 147 Figure 107 Configuration initialization process 149 Figure 108 Node join interaction process 150 Figure 109 Node passively leaves the network interaction process 151 Figure 110 Node actively leaves the network interaction process 152 Figure 111 Diagnosis process diagram 152 Figure 112 Schematic diagram of log process 153 Figure 113 Schematic diagram of network topology including two virtual bus domains 154 Figure 114 Schematic diagram of virtualized application process interaction based on C/S communication model 155 Figure 115 Schematic diagram of virtual ASE local implementation 155 Figure 116 ALPDU message header structure 158 Figure 117 Message structure 160 containing multiple DTUs Figure 118 DTU message format 161 Figure 119 Time Service Notification Message Structure 161 Figure 120 System management data message format 163 Figure 121 Schematic diagram of publisher state machine state transition 164 Figure 122 Schematic diagram of subscriber state machine state transition 165 Figure 123 Schematic diagram of client state machine state migration 166 Figure 124 Schematic diagram of server-side state machine state migration 167 Figure 125 Schematic diagram of time entity state machine state transition 167 Figure 126 Schematic diagram of data entity state machine 168 Figure 127 Schematic diagram of the state transition of the system management entity state machine 169 Figure A.1 Example A resource allocation 170 Figure A.2 Example B resource allocation 171 Figure A.3 Example C resource allocation 172 Figure D.1 Schematic diagram of multicast group working mechanism 175 Figure E.1 Correspondence between OPCUA data model and AUTBUS data model 176 Figure F.1 Example of data transmission unit message content 177 Figure G.1 AUTBUS network topology diagram 178 Figure G.2 AUTBUS virtual bus topology diagram 178 Figure G.3 Schematic diagram of virtual bus network topology based on logical service function RT1 179 Figure H.1 The main process of iron and steel production 181 Figure H.2 Steel Industry Application System Architecture Based on AUTBUS Specification 182 Figure H.3 Steel industry network architecture based on AUTBUS specification 182 Figure I.1 Schematic diagram of AUTBUS dual-ring typical network architecture 185 Figure I.2 Schematic diagram of the fieldbus application data model in the oil and gas industry 186 Figure I.3 Schematic diagram of data management work process 186 Table 1 Primitive language types and abbreviations5 Table 2 Service primitives and parameter description conventions 6 Table 3 primitive parameter representation convention 6 Table 4 State machine transition definition 7 Table 5 INT encoding table 7 Table 6 INT16 type data encoding 8 Table 7 UINT encoding table 8 Table 8 UINT16 type data encoding 8 Table 9 Single-precision floating-point (SingleFLOAT) type data encoding 9 Table 10 Double-precision floating-point (DoubleFLOAT) type data encoding 9 Table 11 TIMEV type data encoding 10 Table 12 TIMEDATE type encoding 10 Table 13 TIMEOFDAY type code 11 Table 14 TIMEDIFFER type encoding 11 Table 15 STRING type data encoding 12 Table 16 Device Configuration Information Table 17 Table 17 Working Mode Information Table 18 Table 18 Synchronization Management Information Table 20 Table 19 System Diagnosis and Maintenance Information Table 21 Table 20 Communication resource management information table 22 Table 21 Link node management information Table 25 Table 22 Link timeout management information Table 25 Table 23 Time Management Information Table 27 Table 24 Network Management Information Table 28 Table 25 Parameter definition of AUTBUS physical layer transmission mode 35 Table 26 Working modes supported by bearer mode A36 Table 27 Working modes supported by bearer mode B37 Table 28 Ph-Param service primitives and parameters 38 Table 29 Ph-Param service primitive parameter description 38 Table 30 Ph-Data service primitives and parameters 39 Table 31 Ph-Data service primitive parameter description 39 Table 32 Ph-Clock-Sync service primitives and parameters 40 Table 33 Ph-Clock-Sync service primitive parameter description 41 Table 34 Primitives and parameters of Ph-RESET 42 Table 35 Ph-RESET service primitive parameter description 42 Table 36 Ph-SET-VALUE primitive and parameters 42 Table 37 Ph-SET-VALUE service primitive parameter description 42 Table 38 Ph-GET-VALUE service primitives and parameters 43 Table 39 Ph-GET-VALUE service primitive parameter description 43 Table 40 Ph-EVENT service primitives and parameters 44 Table 41 Ph-EVENT service primitive parameter description 44 Table 42 Ph-SYNC service primitives and parameters 45 Table 43 Ph-SYNC service primitive parameter description 45 Table 44 RS code mode 49 Table 45 Convolutional code mode 49 TABLE 46 Bit interleaving parameters 50 Table 47 Configuration parameters of OFDM symbols 51 Table 48 Modulation and coding strategy 52 in bearer mode A Table 49 Modulation and coding strategy in bearer mode B 52 Table 50 The minimum set of services that the MDS-MAU interface shall support 53 Table 51 Permissible constellation diagram errors for different modulation methods 56 Table 52 System Transmission Parameters 56 Table 53 Media Interface Definition 56 Table 54 CLMA service primitives and parameters 65 Table 55 CLMA service primitive parameter description 66 Table 56 CLMNA service primitives and parameters 67 Table 57 CLMNA service primitive parameter description 68 Table 58 CLMRA service primitives and parameters 69 Table 59 CLMRA service primitive parameter description 70 Table 60 CLMRRNA service primitives and parameters 72 Table 61 CLMRRNA service primitive parameter description 72 Table 62 CMA service primitives and parameters 74 Table 63 CMA service primitive parameter description 74 Table 64 CMNA service primitives and parameters 75 Table 65 CMNA service primitive parameter description 76 Table 66 Data transfer service status value description 76 Table 67 Data link configuration management service primitives and parameters 78 Table 68 Data link configuration management service primitive parameter description 78 Table 69 CFG_PARAM_INFO structure description 78 Table 70 TIMEOUT_CFG structure description 79 Table 71 GROUP_IDMAP_S structure description 80 Table 72 NODEID_MAC_S structure description 80 Table 73 COMM_RES_CFG structure description 80 Table 74 Data link discovery management service primitives and parameters 83 Table 75 Data link discovery management service primitive parameter description 83 Table 76 Description of NODE_MGT_INFO_S structure 84 Table 77 Data link maintenance management service primitives and parameters 86 Table 78 Data link maintenance management service primitive parameter description 86 Table 79 DIAG_INFO_S structure member parameter description 86 Table 80 Data link creation management service primitives and parameters 88 Table 81 Data link creation management service primitive parameter description 89 Table 82 CH_RES_INFO_S structure member description 89 Table 83 Data link release management service primitives and parameters 91 Table 84 Data link release management service primitive parameter description 91 Table 85 Data link update management service primitives and parameters 93 Table 86 Data link update management service primitive parameter description 93 Table 87 Data link management service status return value description 94 Table 88 Schematic Diagram of Delay Measurement Service Process 95 Table 89 Delay measurement service primitive parameter description 96 Table 90 Clock synchronization service primitives and parameters 97 Table 91 Description of clock synchronization service primitive parameters 98 Table 92 Clock interrupt service primitives and parameters 99 Table 93 Clock interrupt service primitive parameter description 99 Table 94 Description of return value of clock synchronization service status 100 Table 95 DLDE state transition instructions 121 Table 96 DLME state machine state transition description 123 Table 97 Description of clock synchronization state machine state transition 124 Table 98 Description of time information structure TIMEINFO_S 126 Table 99 Clock option information structure CLOCK_OPTION_S Description 127 Table 100 Network Configuration Parameter Structure NETWORK_CFG_PARA_S Description 127 Table 101 MAC mapping table NAOID_MAC_MAP_TABLE_S Description 128 Table 102 IP mapping table structure IP_MAP_TABLE_S Description 128 Table 103 Business data mapping table parameter list 130 Table 104 AUTBUSALASE support for communication models 133 Table 105 Application service interface return value list 133 Table 106 Real-time data service interface parameter list 134 Table 107 Non-real-time data service interface parameter list 136 Table 108 Time service interface parameter list 139 Table 109 Resource service interface parameter list 141 Table 110 Addressing service interface parameter list 144 Table 111 Management service interface parameter list 148 Table 112 Virtual service interface parameter list 154 Table 113 Read service parameters 156 Table 114 Write service parameters 156 Table 115 Application service error code description 157 Table 116 Application layer service type encoding 158 Table 117 Publisher State Machine State Migration Instructions 163 Table 118 Subscriber State Machine State Migration Description 164 Table 119 Client State Machine State Migration Instructions 166 Table 120 Server State Machine State Migration Instructions 166 Table 121 Time Entity State Machine State Transition Description 167 Table 122 Description of state transition of data entity state machine 168 Table 123 Management entity state machine state transition description 169 Table B.1 RS code (255,247) generator polynomial coefficient 173 Table B.2 RS code (255,239) generator polynomial coefficient 173 Table B.3 RS code (255,223) generator polynomial coefficient 173 Table C.1 NodeID and MAC address mapping table 174 Table C.2 An example of the NodeID and MAC address mapping table saved by the terminal node 174 Table D.1 Multicast group mapping table 175 Table G.1 List of Logical Addresses of Nodes in the Virtualized Bus Environment 179

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Industrial Process Measurement Control and Automation Standardization Technical Committee (SAC/TC124). This document is drafted by. Beijing Dongtu Technology Co., Ltd., Machinery Industry Instrumentation Comprehensive Technology and Economic Research Institute, Shenyang Industry University, Chongqing University of Posts and Telecommunications, Shenyang Institute of Automation, Chinese Academy of Sciences, National Pipe Network Group Western Pipeline Co., Ltd., Beijing University of Posts and Telecommunications Science, China Petroleum and Natural Gas Pipeline Engineering Co., Ltd., General Electric Power Planning Institute Co., Ltd., Beijing National New Energy Vehicle Technology Innovation Center, Liao Nanjing University, Beijing Neuron Network Technology Co., Ltd., Shanghai Automation Instrument Co., Ltd., Shenzhen Biaoli Technology Development Co., Ltd., Mianyang City Weibo Electronics Co., Ltd., China Coal Science and Technology Group Changzhou Research Institute Co., Ltd., Shenji (Shanghai) Intelligent System R & D and Design Co., Ltd. Division, Three Gorges University, Dalian University of Technology, CITIC Dicastal Co., Ltd., Huazhong University of Science and Technology, Rockwell Automation (China) Co., Ltd., CRRC Dalian Electric Traction R&D Center Co., Ltd., Shanghai Metrology and Testing Technology Research Institute, Weidmüller Electric Connection (Shanghai) Co., Ltd. The main drafters of this document. Li Ping, Xue Baihua, Huang Yi, Ding Lu, Liu Dan, Wang Shuo, Zhu Ying, Chen Fanmin, Zhang Xiaoling, Huang Zhongsheng, Wei Min, Wang Hao, Liang Wei, Huang Qingqing, Zhang Jinbin, Xu Aidong, Wen Zhigang, Lu Zhiyong, Song Yan, Xu Kuangyi, Wu Fusheng, Wang Xianjin, Ren Junmin, Peng Zhenghong, Shao Zhihui, Bu Zhijun, Bao Weihua, Huang Di, Gao Jingmei, Zhao Liang, Ma Kai, Huang Liang, Zhang Yi, Zhou Chunjie, Wang Fujing, Xu Liang, Du Zhenhuan, Yang Chunhai, Tang Tinglong. Broadband Industrial Bus Based on Time Sensitive Technology AUTBUS system architecture and communication specification

1 Scope

This document specifies the data structure, system architecture and system management of the AUTBUS broadband industrial bus, as well as the physical Layer, data link layer and application layer protocol specification and service definition. This document is applicable to the design, development and application of AUTBUS broadband industrial bus related devices and systems.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 9387.1-1998 Information Technology Open System Interconnection Basic Reference Model Part 1.Basic Model GB/T 15629.3 Specific requirements for telecommunication and information exchange between information technology systems in local area network and metropolitan area network Part 3 Part. Access Method and Physical Layer Specification of Carrier Sense Multiple Access with Collision Detection (CSMA/CD) GB/T 17966-2000 Binary floating-point arithmetic of microprocessor systems GB/T 17967-2000 Information Technology Open System Interconnection Basic Reference Model OSI Service Definition Convention IEC 61158-1.2019 Fieldbus Specification for Industrial Communication Networks Part 1.IEC 61158 and IEC 61784 Series Standards ance for the IEC 61158 and IEC 61784 series) IEC 61158-2.2014 Industrial Communication Network Fieldbus Specification Part 2.Physical Layer Specification and Service Definition (Industrial definition) 3 Terms and Definitions, Abbreviations, Symbols, Conventions 3.1 Terms and Definitions The following terms and definitions apply to this document. 3.1.1 cycle cycle An interval of time during which a sequence of commands or actions is repeated and performed consecutively. [Source. GB/T 20830-2015, 3.1.2.5] 3.1.2 field device fielddevice A physical entity connected to production equipment in a production process or factory, with at least one signaling element communicating with other equipment via cables.