BS EN 61158-3-18-2008 工业通信网络.现场总线规范.数据链路层服务定义.类型18要素

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                   【英文标准名称】:     Industrial communication networks - Fieldbus specifications - Data-link layer service definition - Type 18 elements            【原文标准名称】:     工业通信网络.现场总线规范.数据链路层服务定义.类型18要素            【标准号】:     BS EN 61158-3-18-2008            【标准状态】:     现行            【国别】:     英国            【发布日期】:     2009-01-31    【实施或试行日期】: 【发布单位】: 英国标准学会(GB-BSI)【起草单位】: BSI【标准类型】: ()【标准水平】: ()【中文主题词】: 总线系统;总线;总线(数据加工);总线(数据处理);电路网络;传播学;通讯;通信;控制设备;控制系统;控制工艺学;数据通信;数据链层;数据连接系统;数据处理;数据服务;数据设备;数据传送;定义;耐久性;定义(术语);数字的;数字数据;数字工程;电子数据处理(EDP);EDP;电子数据处理;电气工程;电子仪器;电子系统;英语;字段总线;现场总线;制导系统;工业的;工业设施;信息交换;信息处理;信息技术;界面;接口;接口(数据处理);链路层;开放系统互连;开放系统互连(OSI);OSI;开放系统互连;过程控制;过程控制工程;过程控制系统;信号;规范;规范(验收);传输媒质【英文主题词】: Bus systems;Buses (data processing);Circuit networks;Communication;Control equipment;Control systems;Control technology;Data communication;Data link layers;Data link system;Data processing;Data services;Data transfer;Definitions;Digital;Digital data;Digital engineering;EDP;Electrical engineering;Electronic instruments;Electronic systems;English language;Field bus;Guidance systems;Industrial;Industrial facilities;Information interchange;Information processing;Information technology;Interfaces;Interfaces (data processing);Link layers;Open systems interconnection;OSIrocess controlrocess control engineeringrocess control systems;Signals;Specification;Specification (approval);Transmission media【摘要】: 1.1 OverviewThis standard provides common elements for basic time-critical and non-time-criticalmessaging communications between devices in an automation environment and materialspecific to Type 18 fieldbus. The term “time-critical” is used to represent the presence of atime-window, within which one or more specified actions are required to be completed withsome defined level of certainty. Failure to complete specified actions within the time windowrisks failure of the applications requesting the actions, with attendant risk to equipment, plantand possibly human life.This standard defines in an abstract way the externally visible service provided by the Type18 fieldbus data-link layer in terms ofa) the primitive actions and events of the service;b) the parameters associated with each primitive action and event, and the form which theytake; andc) the interrelationship between these actions and events, and their valid sequences.This standard defines the services provided to? the Type 18 fieldbus application layer at the boundary between the application and datalinklayers of the fieldbus reference model, and? system management at the boundary between the data-link layer and systemsmanagement of the fieldbus reference model.1.2 SpecificationsThe principal objective of this standard is to specify the characteristics of conceptual data-linklayer services suitable for time-critical communications, and thus supplement the OSI BasicReference Model in guiding the development of data-link protocols for time-criticalcommunications. A secondary objective is to provide migration paths from previously-existingindustrial communications protocols.This specification may be used as the basis for formal DL-Programming-Interfaces.Nevertheless, it is not a formal programming interface, and any such interface will need toaddress implementation issues not covered by this specification, including:a) the sizes and octet ordering of various multi-octet service parameters, andb) the correlation of paired request and confirm, or indication and response, primitives.1.3 ConformanceThis standard does not specify individual implementations or products, nor do they constrainthe implementations of data-link entities within industrial automation systems.There is no conformance of equipment to this data-link layer service definition standard.Instead, conformance is achieved through implementation of the corresponding data-linkprotocol that fulfills the Type 18 data-link layer services defined in this standard.【中国标准分类号】: M11【国际标准分类号】: 【页数】: 28P.;A4【正文语种】: 英语