【英文标准名称】:StandardTestMethodforMeasurementofThicknessofAnodicCoatingsonAluminumandofOtherNonconductiveCoatingsonNonmagneticBasisMetalswithEddy-CurrentInstruments
【原文标准名称】:用涡流仪器测量铝阳极镀层及其它非磁性基底金属绝缘镀层的厚度标准试验方法
【标准号】:ASTMB244-1997
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:非磁的;铝;覆层;测量技术;阳极;阳极镀层;涡流法;测量;金属覆层;不导电的;厚度测量
【英文主题词】:measurement;anodic;non-magnetic;thicknessmeasurement;measuringtechniques;anodiccoating;nonconducting;coatings;eddy-currentmethods;metalcoatings;aluminium
【摘要】:
【中国标准分类号】:A29
【国际标准分类号】:17_040_20
【页数】:3P;A4
【正文语种】:英语


【英文标准名称】:Industrialcommunicationnetworks-Fieldbusspecifications-Data-linklayerprotocolspecification-Type1elements
【原文标准名称】:工业通信网络.现场总线规范.数据链路层协议规范.1型元件
【标准号】:BSEN61158-4-1-2008
【标准状态】:现行
【国别】:英国
【发布日期】:2009-03-31
【实施或试行日期】:2009-03-31
【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;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;数据设备;数据传送;定义;数字的;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;英语;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;接口(数据处理);链路层;开放系统互连;OSI;过程控制;过程控制工程;过程控制系统;协议规范;协议;信号;规范;规范(验收);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;Definition;Definitions;Digital;Digitaldata;Digitalengineering;Digitalsignals;EDP;Electricalengineering;Electronicinstruments;Electronicsystems;Englishlanguage;Fieldbus;Guidancesystems;Industrial;Industrialfacilities;Informationinterchange;Informationprocessing;Informationtechnology;Interfaces;Interfaces(dataprocessing);Linklayers;Opensystemsinterconnection;OSI;Processcontrol;Processcontrolengineering;Processcontrolsystems;Protocolspecification;Protocols;Signals;Specification;Specification(approval);Transmissionmedia;Transmissionprotocol
【摘要】:1.1GeneralThedata-linklayerprovidesbasictime-criticalmessagingcommunicationsbetweendevicesinanautomationenvironment.Thisprotocolprovidesthedata-linkservicebymakinguseoftheservicesavailablefromthephysicallayer.TherelationshipbetweentheInternationalStandardsforfieldbusdata-linkservice,fieldbusdata-linkprotocol,fieldbusphysicalserviceandsystemsmanagementisdescribedinIEC/TR61158-1.Thisprotocolprovidescommunicationopportunitiestoallparticipatingdata-linkentitiesa)inacyclicasynchronousmanner,sequentiallytoeachofthosedata-linkentities,andb)inasynchronousmanner,eithercyclicallyoracyclically,accordingtoapre-establishedschedule.Thespecifiedprotocolalsoprovidesmeansofchangingthesetofparticipatingdata-linkentitiesandofmodifyingthesetofscheduledcommunicationsopportunities.Whenthesetofscheduledcommunicationsopportunitiesisnull,thedistributionofcommunicationopportunitiestotheparticipatingdata-linkentitiesiscompletelyasynchronous.Thusthisprotocolcanbecharacterizedasonewhichprovidesaccessasynchronouslybutwithasynchronousoverlay.1.2SpecificationsThisstandardspecifiesa)proceduresforthetimelytransferofdataandcontrolinformationfromonedata-linkuserentitytoapeeruserentity,andamongthedata-linkentitiesformingthedistributeddatalinkserviceprovider;b)thestructureofthefieldbusDLPDUsusedforthetransferofdataandcontrolinformationbytheprotocolofthisstandard,andtheirrepresentationasphysicalinterfacedataunits.NOTEInIEC61158-4-1,grayboxeshavebeenusedinthetablestoindicatethatthespecifiedfieldisnotaconceptualpartofthespecificDLPDU.1.3ProceduresTheproceduresaredefinedintermsofa)theinteractionsbetweenpeerDL-entities(DLEs)throughtheexchangeoffieldbusDLPDUs;b)theinteractionsbetweenaDL-service(DLS)providerandaDLS-userinthesamesystemthroughtheexchangeofDLSprimitives;c)theinteractionsbetweenaDLS-providerandaPh-serviceproviderinthesamesystemthroughtheexchangeofPh-serviceprimitives.1.4ApplicabilityTheseproceduresareapplicabletoinstancesofcommunicationbetweensystemswhichsupporttime-criticalcommunicationsserviceswithinthedata-linklayeroftheOSIorfieldbusreferencemodelsandwhichrequiretheabilitytointerconnectinanopensystemsinterconnectionenvironment.Profilesprovideasimplemulti-attributemeansofsummarizinganimplementation’scapabilities,andthusitsapplicabilitytovarioustime-criticalcommunicationsneeds.1.5ConformanceThisstandardalsospecifiesconformancerequirementsforsystemsimplementingtheseprocedures.Thisstandarddoesnotcontainteststodemonstratecompliancewithsuchrequirements.
【中国标准分类号】:M11
【国际标准分类号】:25_040_40;35_100_20
【页数】:428P.;A4
【正文语种】:英语