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工业通讯网络.现场总线规范.应用层服务定义.2型元件  
 【英文标准名称】  Industrial communication networks - Fieldbus specifications - Part 5-2: Application layer service definition — Type 2 elements
 【原文标准名称】  工业通讯网络.现场总线规范.应用层服务定义.2型元件
 【标准号】  BS EN 61158-5-2-2008
 【标准状态】  废止
 【国别】  英国
 【发布日期】  2008-06-30
 【实施或试行日期】  2008-06-30
 【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】  应用层;应用;总线系统;总线;电路网络;通信;计算机应用;计算机控制;控制;控制设备;控制系统;控制工艺学;数据总线;数据通信;数据交换;数据传输线;数据连接系统;数据网络;数据处理;数据服务;数据传送;数据传输控制规程;定义;数字的;数字数据;数字工程;电子数据处理;电气工程;电子仪器;电子系统;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;接口(数据处理);开放系统互连;操作技术;OSI;过程控制工程;服务;规范;规范(验收);传输媒质
 【英文主题词】  Application layer;Applications;Bus systems;Buses (data processing);Circuit networks;Communication;Computer applications;Computerized control;Control;Control equipment;Control systems;Control technology;Data bus;Data communication;Data exchange;Data line;Data link system;Data network;Data processing;Data services;Data transfer;Data transmission control procedures;Definition;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 (data processing);Open systems interconnection;Operational techniques;OSI;Process control engineering;Services;Specification;Specification (approval);Transmission media
 【摘要】  1.1 OverviewThis standard provides common elements for basic time-critical and non-time-criticalmessaging communications between application programs in an automation environment andmaterial specific to Type 2 fieldbus. The term “time-critical” is used to represent the presenceof a time-window, within which one or more specified actions are required to be completedwith some defined level of certainty. Failure to complete specified actions within the timewindow risks failure of the applications requesting the actions, with attendant risk toequipment, plant and possibly human life.The purpose of this standard is to define the services provided to1) the FAL user at the boundary between the user and the application layer of the fieldbusreference model, and2) Systems Management at the boundary between the application layer and SystemsManagement of the fieldbus reference model.This standard specifies the structure and services of the Type 2 fieldbus application layer, inconformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI applicationlayer structure (ISO/IEC 9545).FAL services and protocols are provided by FAL application-entities (AE) contained within theapplication processes. The FAL AE is composed of a set of object-oriented application serviceelements (ASEs) and a layer management entity (LME) that manages the AE. The ASEsprovide communication services that operate on a set of related application process object(APO) classes. One of the FAL ASEs is a management ASE that provides a common set ofservices for the management of the instances of FAL classes.Although these services specify, from the perspective of applications, how request andresponses are issued and delivered, they do not include a specification of what the requestingand responding applications are to do with them. That is, the behavioral aspects of theapplications are not specified; only a definition of what requests and responses they cansend/receive is specified. This permits greater flexibility to the FAL users in standardizing such object behavior. In addition to these services, some supporting services are also definedin this standard to provide access to the FAL to control certain aspects of its operation.1.2 SpecificationsThe principal objective of this standard is to specify the characteristics of conceptualapplication layer services suitable for time-critical communications, and thus supplement theOSI Basic Reference Model in guiding the development of application layer protocols for timecriticalcommunications.A secondary objective is to provide migration paths from previously-existing industrialcommunications protocols. It is this latter objective which gives rise to the diversity of servicesstandardized as the various Types of IEC 61158, and the corresponding protocolsstandardized in subparts of IEC 61158-6.This specification may be used as the basis for formal application programming interfaces.Nevertheless, it is not a formal programming interface, and any such interface will need toaddress implementation issues not covered by this specification, includinga) 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 does it constrainthe implementations of application layer entities within industrial automation systems.There is no conformance of equipment to this application layer service definition standard.Instead, conformance is achieved through implementation of conforming application layerprotocols that fulfill the Type 2 application layer services as defined in this standard.
 【中国标准分类号】  L79
 【国际标准分类号】  35_100_70;35_160;35_240_50
 【页数】  192P.;A4
 【正文语种】  英语
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