MIL-HDBK-232A
时间:2024-05-11 17:47:54 来源: 标准资料网 作者：标准资料网 阅读：9700
MIL-HDBK-232A, MILITARY STANDARD RED/BLACK ENGINEERING INSTALLATION GUIDELINES (20 MAR 1987)., .This handbook provides guidance within the RED/BLACK concept for the engineering and installation of systems and facilities processing classified information. The engineering installation concepts contained herein should be selectively applied for control of TEMPEST at all Department of Defense (DOD) facilities where classified information is processed.
【英文标准名称】:StandardSpecificationforCalcium-SiliconAlloys
【原文标准名称】:硅钙合金的标准规范
【标准号】:ASTMA495-2006
【标准状态】:现行
【国别】:美国
【发布日期】:2006
【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】:钙;锰;金属;硅
【英文主题词】:Calcium;Manganese;Metals;Silicon
【摘要】:
【中国标准分类号】:H62
【国际标准分类号】:77_120_99
【页数】:2P;A4
【正文语种】:英语
【英文标准名称】:Industrialcommunicationnetworks-Fieldbusspecifications-Part4-17:Data-linklayerprotocolspecification-Type17elements
【原文标准名称】:工业通讯网络.数据总线规范.第4-17部分:数据联络层协议规范.17型元件
【标准号】:IEC61158-4-17-2007
【标准状态】:现行
【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】: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;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;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;Definitions;Digital;Digitaldata;Digitalengineering;Digitalsignals;EDP;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.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.1.3ProceduresTheproceduresaredefinedintermsofa)theinteractionsbetweenpeerDL-entities(DLEs)throughtheexchangeoffieldbusDLPDUs;b)theinteractionsbetweenaDL-service(DLS)providerandaDLS-userinthesamesystemthroughtheexchangeofDLSprimitives;c)theinteractionsbetweenaDLS-providerandaPh-serviceproviderinthesamesystemthroughtheexchangeofPh-serviceprimitives.1.4ApplicabilityTheseproceduresareapplicabletoinstancesofcommunicationbetweensystemswhichsupporttime-criticalcommunicationsserviceswithinthedata-linklayeroftheOSIorfieldbusreferencemodels,andwhichrequiretheabilitytointerconnectinanopensystemsinterconnectionenvironment.Profilesprovideasimplemulti-attributemeansofsummarizinganimplementation’scapabilities,andthusitsapplicabilitytovarioustime-criticalcommunicationsneeds.1.5ConformanceThisstandardalsospecifiesconformancerequirementsforsystemsimplementingtheseprocedures.Thisstandarddoesnotcontainteststodemonstratecompliancewithsuchrequirements.
【中国标准分类号】:N18;P76
【国际标准分类号】:25_040_40;35_100_20;35_160;35_240_50
【页数】:36P;A4
【正文语种】:英语