系统接地1.CPU——是PLC的核心部分。与通用微机CPU一样，CPU在PC系统中的作用类似于***的******。其功能：（6）PLC维护比PC容易。上位机系统与plc之间通过以太网连接，水东电厂的计算机监控系统采用南瑞集团公司的nc2000系统。narinc2000计算机监控系统是南瑞集团面向水利水电领域的新一代计算机监控系统软件［2］。nc2000具有良好的人机界面和网络功能，与施耐德plc网络通信采用tcp/ipmodbus规约。在组态环境下，设计人员对plc进行驱动配置，运行环境以图形画面形式的人机界面监控水位信息、故障报警，对有关数据存储历史库，生成报表，同时利用web功能使系统具有在线监控功能，即在***的情况下在任何一台联网的计算机上用标准的浏览器可远程监控。限于篇幅，上位机程序不再详述。在全世界上百个PLC制造厂中，有几家举足轻重的公司。它们是美国Rockwell自动化公司所属的A．B(AllenBradly)公司、GE-Fanuc公司，德国的西门子(Siemens)公司和法国的施耐德(Schneider)自动化公司，日本的三菱公司和欧姆龙(OMRON)公司。这几家公司控制着全世界80%以上的PLC市场，它们的系列产品有其技术广度和深度，从微型PLC到有上万个I／O(输入，输出)点的大型PLC应有尽有。很多时候，在一些大型的装配机械应用中你可能需要做启停的顺序逻辑控制。这些顺序控制保证在使用急停电路之前和保护通道打开之前正确地停下你的机器，很明显，通过这样控制机器的停止是有好处的。如果一个自动化过程启动以后，你想在停止机器之前允许它结束工作，特别是有一个必需的装配顺序在你的自动化机器工作周期中。一个控制停止更优于使用急停，所以你不必释放信息的跟踪，或者在周期的中间停止。6KP1123010X1B1BergerLahrTLC612FServoDrive+PBDPProfibus+MEMF10+RS24TopZustandSiemensPanelKTP1000BasicDP6***6647-0AE11-3AX0E-St.10unusedOVPTelemecaniqueXBTK70101PATerminalTextanzeige24VDC10WtestedNEUWERTIGWB07X11113GEControlPanelSubA***GenuineOEMWB07X11113EmersonFlowControls{Alco}Ter25Fx6AExpansionValveOEM55111HEWLETT-PACKARDAGILENT03497-6650944421A20CHANNELGUARDEDACQUISITIONCLIPPARDEMC-12-00-0112VALVEELECMFLDCARDNOVALVESTECAN10760724MICROPLATEHOLDERFORTE-SHAKESHAKER***EVO75LUMINEX200HPAGILENT8594E2.9GHZSPECTRUMANALYZER004041101J62SquareDEJB340403pole40amp480vNFpanelcircuitbreakerNewinboxwarranty!Siemens400amp208Y/120MainlugcircuitbreakerpanelboardtypeBLNEWP1SaleSquareDelectricalTransformer45T85HIS45kva208v208y/120warranty272409-SGASKET-FUELTANK(27911)3-5HPPulsaJetHorizontalBriggsOEMNewL14SEALMASTERNewBallBearingInsert(SO4RAL)FORDOEMNOSF0VY-10756-BBatteryHoldDownBoltCrownVictoriaGrandMarquis4pcOEMFORDSWITCHDIRINDIC/WARNE5TZ-13341-BICMICM282Lennox98M59Lennox15T43AO***ith100110740Lennox102175-01newinboxpanduitjbp1iiwsinglegangpowerjunctionbox2NEWSurplusHUBBELLHBL5661ISINGLERECEPT***E15AMP250VIVORYALCATEL-LUCENT8DG02649AA01DS3ProtectionAccessAssembly#3OmronNT-AL001LINKAdapterDC5V0,8W+KabelLiYY10x0,25XM2S-00TopZustandSiemensSimadynD6DD1611-0AD0MM11OmronE3S-CT66-DPhotoelectricSwitchE3S-CT66UNUSEDOVP6KP1123010X1B1JohnsonControls24VS/RFltgActr177InlbOEM***220-AGA-3Asco11/2"N/C,5/50Steam,5/150H.WtrOEM8220G11OPTEMZOOM10030-11-11MICROSCOPEHEADIRIS301111KEITHLEYINSTRUMENTS7116-MWS16-CHANNELMICROW***ESWITCHSYSTEMGIGATRONICS8541BUNIVERSALPOWERMETEROPTION0103RACKEARSYMBOLLOT:10XPPT2740PPT2740-ZRIW0E1CBARCODESCANNERCutlerHammerEDB3150circuitbreaker3pole150amptype1yearwarranty!!SquareDQOB350circuitbreaker3pole50ampboltontypeQOB1yearwarranty!CutlerHammerFC30153pole15amp600vcircuitbreaker1yearwarranty!GENERALELECTRICTHMR1HUSPPTHMR1HAmphenol31-5136CoaxialBNCPlugHoneywellL604A1185PressuretrolControllerTemperatureControlCumminsKIT,AIRCONTROLSP3806238Lennox56W34Lennox19K47Lennox32L63Lennox14G37AO***ith100109183(2)ELPIDAMEMDIMM2GBPC3-10600MEMORYMODULEEBJ21UE8BDF0-DJ-FWESTINGHOUSEA200MICACACMAGNETICSTARTERDellPowerVault114Xw/1xRD1000TapeDriveRexrothServomotorMSK061C-0600-NN-M1-BG0-NNNNmax600011,6AUNUSEDOVPB&R2PS425.9PowerSupplyModuleUnbenutztOVPSEWMovitracMC07B0055-503-4-50/FSC11BFrequenzumrichterNeuwertigMcQuayDaikin1/8Hp265V1075Rpm4SpdMotorOEMHWDQ5778Armstrong1"MainValveW/Pilot3/21OEMGP-2000-1-3/21BRAND759200UV-CUVETTEMICROCENTERH8.5MM,VOLUME70-850ΜLCUVETTEGRANITEBLOCKWITHPARTS13.75"X14.125"X4.75"TALL~13"14"4"XYSTAGERAININE4XLS100uL-1mLLTSELECTRONICPIPETTEE4-1000XLS17012310SWAGELOKSS-DLVCR4STAINLESSHIGHPURITYHIGHPRESSUREDIAPHRAGMSEALEDVALVESquareDQBA321253pole125amp240vcircuitbreakernewinbox1yearwarranty!Siemens200ampX2004L2GIG480/277buswaybusductXJ-LedgeelbowrighthandSquareDQBA321753pole175amp240vcircuitbreakernewinboxwarranty!OmronNT31C-ST141B-EV1FREIGHTLINERGEAR,COUNTERSHAFTFUL-3315747RyobiHP54L4-VoltLithium-IonScrewdriverKitP4SIEMENSGENERALDUTYSAFETYSWITCHGF222N60AMPFUSIBLENEMA1<625II2Reznor95548Mcdonnell&Miller69Lennox16K99ResearchProducts8126FieldControlsSWG-3(46130002)3"PowerVenter(70,000BTU)Lotof2BussR25030-2CRFuseholder30Amp250Volt2PoleLotof5IdecRH2B-URelaysUsed(4)RH2B-U(1)RH1B-UFERRAZSHAWMUTA4BY2000SchneiderElectricServomotorSH140/40270/0/0/00/00/00/01/00SH31403S0001467Siemens6SE7090-0XX87-0BB0TechBoardT100Version5unbenutztOVPMARKEM***ARTDATE2MODELREFS2IPRHoneywellMultizoneLoadAnalyzr3Ht/ClOEMW7080A1016Bell&GossettBalancedtripledutyvalve3Ds-3BOEM132160ANRITSUMP1552BCOVERPROTECTIVELIDFACEPLATESHIELDTOPKEITHLEY177MICROVOLT4.5DIGITMULTIMETERDMMMITUTOYO543-683ABSOLUTELCDDIGIMATICINDICATORID-S0.375"STEMDIAID-S1012EFESTODGSL-4-10-EAMINISLIDE5701584MMPISTON10MMSTROKEWITH2XSENSORSquareDKA36225circuitbreaker3pole225amp600vIline1yearwarranty!!6KP1123010X1B1SiemensED43B0253pole25amp480vcircuitbreakerEDtypeed43b025lwarranty!SquareDFA26020AC2pole20amp600vcircuitbreakerAmericanStandardCadet3Flowise12"RoughTank4021128N.020WhiteABBSensyconI/PConvertertype22/06652206654-20mA3-15PSIDINRAIL1/8NPTWIHA32005InsulatedScrewdriver,Slotted,5/64x3In33365WIX3365NapaGoldFuelFilterReggioRegistersAluminumscrollpatterngrille14x14Blacknoholes#1616-ABNHHoneywellVR8304M2501Robertshaw700-428HoneywellL91B1068AO***it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