简介:摘要:DCS系统的可靠接地,是保证石油化工公司DCS安全、可靠运行的首要条件。本人根据对中石油哈尔滨石化公司的一些系统设计、现场经验,对DCS系统的接地,进行了探讨和简要介绍。
简介:以和利时公司的SmartPro系统为依托,针对职业实践教学要求设计出接近生产实际的DCS系统仿真方案,其包含电厂控制系统仿真和SmartPro系统组态两部分。DCS系统仿真的训练极大地提高了学生的动手能力和工程实践能力,对其他类似实践教学设计有一定的指导意义。
简介:WithintheATLASexperimentTrigger/DAQandDCSarebothlogicallyandphysicallyseparated.Neverthelessthereisaneedtocommunicate.TheinitialproblemdefinitionandanalysissuggestedthreesubsystemstheTrigger/DAQDCSCommunication(DDC)projectshouldsupporttheabilityto:1.exchangedatabetweenTrigger/DAQandDCS;2.sendalarmmessagesfromDCStoTrigger/DAQ;3.issuecommandstoDCSfromTrigger/DAQ.Eachsubsystemisdevelopedandimplementedindependentlyusingacommonsoftwareinfrastructure.AmongthevarioussubsystemsoftheATLASTrigger/DAQtheOnlineisresponsibleforthecontrolandconfiguration.Itistheglueconnectingthedifferentsystemssuchasdataflow.level1andhigh-leveltriggers.TheDDCusesthevariousOnlinecomponentsasaninterfacepointontheTrigger/DAQsidewiththePVSSIISCADAsystemontheDCSsideandaddressesissuessuchaspartitioning,timestamps,eventnumbers,hierarchy,authorizationandsecurity,PVSSIIisacommercialproductchosenbyCERNtobetheSCADAsystemforallLHCexperiments,ItsAPIprovidesfullaccesstoitsdatabase,whichissufficienttoimplementthe3subsystemsoftheDDCsoftware,TheDDCprojectadoptedtheOnlineSoftwareProcess,whichrecommendsabasicsoftwarelife-cycle:problemstatement,analysis,design,implementationandtesting.Eachphaseresultsinacorrespondingdocumentorinthecaseoftheimplementationandtesting,apieceofcode,InspectionandreviewtakeamajorroleintheOnlinesoftwareprocess,TheDDCdocumentshavebeeninspectedtodetectflawsandresultedinaimprovedquality.AfirstprototypeoftheDDCisreadyandforeseentobeusedatthetest-beamduringsummer2001.