【英文标准名称】:Industrialcommunicationnetworks-Fieldbusspecifications-Part5-21:Applicationlayerservicedefinition-Type21elements
【原文标准名称】:工业通信网络.现场总线规范.第5-21部分:应用层设备定义.21型元件
【标准号】:IEC61158-5-21-2010
【标准状态】:现行
【国别】:国际
【发布日期】:2010-08
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC65C
【标准类型】:()
【标准水平】:()
【中文主题词】:总线系统;总线;电路网络;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;数据传送;定义;数字数据;数字工程;数字信号;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;工业设施;信息交换;信息处理;信息技术;接口;接口(数据处理);链路层;开放系统互连;OSI;物理层;过程控制;过程控制工程;过程控制系统;协议规范;协议;信号;传输媒质;传输协议
【英文主题词】:Bussystems;Buses(dataprocessing);Circuitnetworks;Communication;Controlequipment;Controlsystems;Controltechnology;Datacommunication;Datalinklayers;Datalinksystem;Dataprocessing;Dataservices;Datatransfer;Definitions;Digitaldata;Digitalengineering;Digitalsignals;EDP;Electricalengineering;Electronicinstruments;Electronicsystems;Fieldbus;Guidancesystems;Industrialfacilities;Informationinterchange;Informationprocessing;Informationtechnology;Interfaces;Interfaces(dataprocessing);Linklayers;Opensystemsinterconnection;OSI;Physicallayers;Processcontrol;Processcontrolengineering;Processcontrolsystems;Protocolspecification;Protocols;Signals;Transmissionmedia;Transmissionprotocol
【摘要】:TheFieldbusApplicationLayer(FAL)providesuserprogramswithameanstoaccessthefieldbuscommunicationenvironment.Inthisrespect,theFALcanbeconsideredawindowbetweencorrespondingapplicationprograms.Thisstandardprovidesthecommonelementsforbasictime-criticalandnon-time-criticalmessagingcommunicationsbetweenapplicationprogramsinanautomationenvironmentaswellasmaterialspecifictotheType21protocol.Theterm“time-critical”isusedtorepresentthepresenceofatime-windowwithinwhichoneormorespecifiedactionsarerequiredtobecompletedwithsomedefinedlevelofcertainty.Failuretocompletespecifiedactionswithinthetimewindowrisksfailureoftheapplicationsrequestingtheactions,withattendantrisktoequipment,plant,andpossiblyhumanlife.Thisstandarddefines,inanabstractway,theexternallyvisibleserviceprovidedbytheFALintermsof:a)anabstractmodelfordefiningapplicationresources(objects)capableofbeingmanipulatedbyusersviatheFALservice;b)theprimitiveactionsandeventsoftheservice;c)theparametersassociatedwitheachprimitiveactionandevent,andtheformthattheytake;d)theinterrelationshipbetweentheseactionsandevents,andtheirvalidsequences.Thepurposeofthisstandardistodefinetheservicesprovidedto:a)theFAL-userattheboundarybetweentheuserandtheapplicationlayerofthefieldbusReferenceModel;b)systemsmanagementattheboundarybetweentheapplicationlayerandsystemsmanagementofthefieldbusReferenceModel.ThisstandarddescribesthestructureandservicesoftheIECFAL,inconformancewiththeOSIBasicReferenceModel(ISO/IEC7498)andtheOSIApplicationlayerStructure(ISO/IEC9545).FALservicesandprotocolsareprovidedbyFALapplicationentities(AEs)containedintheapplicationprocesses.TheFALAEiscomposedofasetofobject-orientedApplicationServiceElements(ASEs)andaLayerManagementEntity(LME)thatmanagestheAE.TheASEsprovidecommunicationservicesthatoperateonasetofrelatedapplicationprocessobject(APO)classes.OneoftheFALASEsisamanagementASEthatprovidesacommonsetofservicesformanagementoftheinstancesofFALclasses.Althoughtheseservicesspecifyhowrequestsandresponsesareissuedanddeliveredfromtheperspectiveofapplications,theydonotincludeaspecificationofwhattherequestingandrespondingapplicationsaretodowiththem.Thatis,theseservicesonlydefinewhatrequestsandresponsesapplicationscansendorreceive,notthefunctionsoftheapplicationsthemselves.ThispermitsgreaterflexibilitytotheFAL-usersinstandardizingsuchobjectbehavior.Inadditiontotheseservices,somesupportingservicesarealsodefinedinthisstandardtoprovideaccesstotheFALtocontrolcertainaspectsofitsoperation.
【中国标准分类号】:M11
【国际标准分类号】:25_04_40;35_100_70;35_110
【页数】:78P.;A4
【正文语种】:英语