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【英文标准名称】:Industrialcommunicationnetworks-Fieldbusspecifications-Part5-15:Applicationlayerservicedefinition-Type15elements
【原文标准名称】:工业通讯网络.现场总线规范.第5-15部分:应用层设备定义.15型元件
【标准号】:IEC61158-5-15-2007
【标准状态】:作废
【国别】:国际
【发布日期】:2007-12
【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】: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;数据设备;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;服务设施;规范;规范(验收);传输媒质
【英文主题词】:Applicationlayer;Applications;Bussystems;Buses(dataprocessing);Circuitnetworks;Communication;Computerapplications;Computerizedcontrol;Control;Controlequipment;Controlsystems;Controltechnology;Databus;Datacommunication;Dataexchange;Dataline;Datalinksystem;Datanetwork;Dataprocessing;Dataservices;Datatransfer;Datatransmissioncontrolprocedures;Definitions;Digital;Digitaldata;Digitalengineering;EDP;Electronicinstruments;Electronicsystems;Englishlanguage;Fieldbus;Guidancesystems;Industrial;Industrialfacilities;Informationinterchange;Informationprocessing;Informationtechnology;Interfaces(dataprocessing);MODBUS;Opensystemsinterconnection;Operationaltechniques;OSI;Processcontrolengineering;Services;Specification;Specification(approval);Transmissionmedia
【摘要】:1.1OverviewInnetworkcommunications,asinmanyfieldsofengineering,itisafactthat“onesizedoesnotfitall.”Engineeringdesignisaboutmakingtherightsetoftrade-offs,andthesetrade-offsmustbalanceconflictingrequirementssuchassimplicity,generality,easeofuse,richnessoffeatures,performance,memorysizeandusage,scalability,determinism,androbustness.Thesetrade-offsmustbemadeinlightofthetypesofinformationflow(e.g.periodic,one-tomany,request-reply,events),andtheconstraintsimposedbytheapplicationandexecutionplatforms.TheType15fieldbusprovidestwomajorcommunicationmechanismsthatcomplementeachotherstosatisfycommunicationrequirementsinthefieldofautomation:theClient/ServerandthePublish/Subscribeparadigms.Theycanbeusedconcurrentlyonthesamedevice.Type15Client/ServeroperatesinaClient/Serverrelationship.Itsapplicationlayerservicedefinitionsandprotocolspecificationsareindependentoftheunderlyinglayers,andhavebeenimplementedonavarietyofstacksandcommunicationmedia,includingEIA/TIA-232,EIA/TIA-422,EIA/TIA-425,HDLC(ISO13239),fiber,TCP/IP,WirelessLANsandRadios.Type15Publish/SubscribeoperatesinaPublish/Subscriberelationship.Itsapplicationlayerservicedefinitionsandprotocolspecificationsareindependentoftheunderlyinglayersandcanbeconfiguredtoprovidereliablebehaviourandsupportdeterminism.ThemostcommonstackisUDP/IP.Thefieldbusapplicationlayer(FAL)providesuserprogramswithameanstoaccessthefieldbuscommunicationenvironment.Inthisrespect,theFALcanbeviewedasa“windowbetweencorrespondingapplicationprograms.”ThispartofIEC61158providescommonelementsforbasictime-criticalandnon-time-criticalmessagingcommunicationsbetweenapplicationprogramsinanautomationenvironmentandmaterialspecifictoType15fieldbus.Theterm“time-critical”isusedtorepresentthepresenceofatime-window,withinwhichoneormorespecifiedactionsarerequiredtobecompletedwithsomedefinedlevelofcertainty.Failuretocompletespecifiedactionswithinthetimewindowrisksfailureoftheapplicationsrequestingtheactions,withattendantrisktoequipment,plantandpossiblyhumanlife.1.2SpecificationsTheprincipalobjectiveofthispartofIEC61158istospecifythecharacteristicsofconceptualapplicationlayerservicessuitablefortime-criticalcommunications,andthussupplementtheOSIBasicReferenceModelinguidingthedevelopmentofapplicationlayerprotocolsfortimecriticalcommunications.1.3ConformanceThispartofIEC61158doesnotspecifyindividualimplementationsorproducts,nordotheyconstraintheimplementationsofapplicationlayerentitieswithinindustrialautomationsystems.Thereisnoconformanceofequipmenttothisapplicationlayerservicedefinitionstandard.Instead,conformanceisachievedthroughimplementationofconformingapplicationlayerprotocolsthatfulfilltheType15applicationlayerservicesasdefinedinthispartofIEC61158.1.4TypeoverviewInnetworkcommunications,asinmanyfieldsofengineering,itisafactthat“onesizedoesnotfitall.”Engineeringdesignisaboutmakingtherightsetoftrade-offs,andthesetrade-offsmustbalanceconflictingrequirementssuchassimplicity,generality,easeofuse,richnessoffeatures,performance,memorysizeandusage,scalability,determinism,androbustness.Thesetrade-offsmustbemadeinlightofthetypesofinformationflow(e.g.periodic,one-to-many,request-reply,events),andtheconstraintsimposedbytheapplicationandexecutionplatforms.
【中国标准分类号】:N18;P76
【国际标准分类号】:25_040_40;35_100_70;35_160
【页数】:144P;A4
【正文语种】:英语


Product Code:SAE AMS5814
Title:Cobalt Alloy, Corrosion and Heat Resistant, Welding Wire 52co 20cr 20ni 7.5ta Vacuum Melted
Issuing Committee:Ams F Corrosion Heat Resistant Alloys Committee
Scope:This specification covers a corrosion and heat-resistant cobalt alloy in the form of welding wire.