高层建筑恒压供水控制系统毕业论文设计

北方民族大学学士学位论文高层建筑恒压供水控制系统设计[2]。5.2监控画面设计监控画面绘制过程简述如下：从开始菜单启动组态王6.53资源管理器窗口，如图5.1所示：图5.1在资源管理器窗口里点击新建按钮，输入项目名称，选择保存路径，单击“创建”按钮，一个新的工程就建立了。然后进行变量的添加，方法是在图5.2所示的窗口中双击变量管理器，出现一个新窗口。右键单击右边窗口，然后创建一个新变量，选择变量的类型，最后保存即可，如图5.3所示。图5.2图5.3变量添加好后，进行主画面的绘制，绘制后的主画面如图5.4。图5.45.3水压显示设计在图5.4所示主画面中的报表窗口输入静态文字“水压”、“Mpa”、“值班人”，然后在B1中插入动态变量“本站点/水压”，这样，水压就可以在组态监控界面上实时显示，达到了设计的要求。

结论本论文研究的是高层建筑恒压供水系统，设计的核心是PLC和变频器，利用西门子S7-200系列PLCCPU226强大而灵活的控制功能和MICROMASTER变频器优良的变频调速性能，实现了恒压供水的控制。该系统按实际需要,使用数据传送指令，在梯形图程序中设定压力给定值，根据压力差调整水泵的工作情况，进行水泵的工频/变频控制，高压时水泵工作方式的切换甚至停止，发生火灾时，辅助泵的工频启动，实现恒压供水。在启动时压力波动小，可控制在给定值的±2％范围内。且设计能够满足生活用水、消防用水，即通过控制1#泵、2#泵保障日常生活用水，消防紧急用水时，3#泵进入工频运行模式。由于设计了组态监控界面，工作人员不需要频繁在一线操作，还可以实现远程监控。在将来，人力的节省、供水质量的提高、劳动强度的减轻、管理费用的节约等优势将使本系统得到更为广泛的应用。不过，受限于实验室条件，本次设计自动化程度还是有待提高之处，主要体现在许多辅助功能无法实现，比如蓄水池水位检测，楼层供水液位实时监控，水泵电机的多段调速。在以后的恒压供水工程实施中，水泵组的电气控制柜可以使用不同的按钮代替本次设计使用的自锁按钮，比如旋钮，触点触发式，旋转复位按钮等。目前，国内外关于本供水系统方面的研究中，在能适应不同的控制性能、PLC网络通讯、用水场合多样化、同时兼顾系统自动化程度等方面还有一定的提高空间。因此，有待于进一步研究本课题的潜在附加功能，使它的自动化水平能够变得更高，在楼层供水行业中占得更加广阔的市场。

致谢对于这次毕业设计的顺利完成、毕业论文的撰写与完善，我十分感谢我的导师石万里老师！本设计从选题到主体控制方案的定夺，我的导师都对我给予了很大的帮助与指导。在硬件的制作、PLC梯形图程序的编写、组态监控界面的设计中，老师给我讲解了PLC的许多经典应用、模块化的编程思维以及组态监控界面的程序设计。系统硬件与梯形图程序、硬件与组态监控的调试中，老师丰富的调试方法，也是深深地让我折服。在这两个多月时间里，老师常常花费他宝贵的工作时间，陪我在实验室编写程序，调试。他渊博的知识、严谨的治学态度、崇高的敬业精神与为人师表的典范，使我受益匪浅。在此，谨向我的导师表示最衷心的感谢。最后，我要感谢关心我们论文撰写的各位学院领导和老师们，感谢你们四年来的悉心栽培！参考文献谢丽萍，王占富，岂兴明.西门子S7-200系列PLC快速入门与实践.[Z].北京：人民邮电出版社，2010.5（工业自动化实用技术丛书）.北京亚控科技发展有限公司技术部.6.5初级培训教程KingView组态王.[Z].2009.6.高安邦，石磊，张晓辉.西门子S7-200/300/400系列PLC自学手册.[Z].北京：中国电力出版社，2012.3.西门子（中国）有限公司.西门子S7-200中文系统手册.西门子（中国）有限公司.MICROMASTER420通用型变频器使用大全.张燕宾.变频调速应用.实践机械工业出版社，2002:244-251.2014年中国水务行业市场发展现状[EB/OL]./view/e4a65399da38376bae1fae19.html.附录附录1：梯形图程序附录2：外文文献PLCtechniquediscussionandfuturedevelopmentAlongwiththedevelopmentoftheages,thetechniquethatisnowadaysisalsograduallyperfect,thecompetitionplaysmoremorestrong;theoperationthatlistdependstheartificialhasalreadycan'tsatisfiedwiththecurrentmanufacturingindustryforeground,alsocan'tguaranteetherequestofthehigherquantityandhighnewtheimageofthetechniquebusinessenterprise.Thepeopleseeinproducepractice,automatebroughtthetremendousconvenienceandtheproductquantitiesforpeopleupofassurance,alsoeasedthepersonnel'slaborstrength,reducetheestablishmentonthepersonnel.Thetargetcontrolofthehardrealizationinmanycomplicatedproductionlines,wholeandexcellentturn,thebestdecisionetc.,well-trainedoperationwork,technicalpersonnelorexpert,governorbutcanjudgeandoperateeasily,canacquirethesatisfiedresult.Theresearchtargetoftheartificialintelligencemakesuseofthecalculatorexactlytocarryout,imitatetheseintelligencesbehavior,moderatingtheworkthroughperson'sbrainandcalculators,withthemodethatperson'smachinecombine,forresolvetheverycomplicatedproblemtolookforthebestpathWecomeinsightofthecontrolthatlinksaftertheelectricappliancesinvarioussituation,thatisalreadythethattimegenerationpast,nowofafteruseinthemoldaperhapssimpleequipmentsofgrass-rootscontrolthattheelectricappliancescandoforthelowlevelonly;AndthePLCemergencealsobecametheepoch-makingtopic,addingthevividsoftwarecontrolthroughaveryandstablehardware,makingtheautomationheadforthenewhightide.ThePLCbiggestcharacteristicsliein:Theelectricalengineeringteacheralreadynolongerelectrichardwareuptoomanycalculationsesofcost,aslongasordertheimportationthatthebuttonswitchortheimportationofthesensorsordertolinkthePLCupcansolveproblem,passtooutputtoordertheconjunctioncontactmachineorcontrolthestartequipmentsofthebigpoweraftertheelectricappliances,buttheexportationequipmentsdirectconjunctionofthesmallpowercan.PLCinternalcontainmenthavetheCPUoftheCPU,andtaketohaveanI/Oforexpandofexteriortoconnectapeople'saddressandsavingmachinethreebigpiecestoconstitute,CPUcoreisfromanormanyistiredtoaddthemachinetoconstitute,mathematicsthattheyhavethelogicoperationability,andcanreadtheproceduresavethecontentsofthemachinetodrivethehomologoussavingmachineandI/Ostoconnectafterpassthecalculation;TheI/Oaddinnerpartistiredtheinputandoutputsystemofthemachineandexteriorlink,anddeposittherelateddataintotheproceduresavingmachineordatasavingmachine;ThesavingmachinecandepositthedatathattheI/Oinputinthesavingmachine,andinworkadjustingtobecometiredtoaddthemachineandI/Ostoconnect,savingmachineseparatelysavingmachineRAMoftheproceduresavingmachineROManddatas,theROMcancandodepositofthedatapermanenceinthesavingmachine,butRAMonlyfortheCPUcomputesthetemporarycalculationusageofhourofbufferspace.ThePLCanti-interferenceisveryandexcellent,ourrootneednotconcernitsservicelifeandtheworksituationbad,theseallproblemshavealreadynolongerbecomethetopicthatwefail,butstaytoourisaconcerntocometointernalresourcesofmakeuseofthePLCtostrengthenthecontrolabilityoftheequipmentsforus,makeourequipmentsmoregentle.PLClanguageisnotweimagineofeditcollectedmaterialsthelanguageorlanguageofCstocarryonweavingthedistance,butthetrapezoiddiagramthattheadoptionisoriginalaftertheelectricappliancestocontrol,maketheelectricalengineeringteacherwhileweavingtowritetheprocedureveryeasycomprehendedthePLClanguage,andalotofnon-electricityprofessionalalsoveryquicklyknowandgodeepintotothePLC.IsPLConeoftheadvantageaboveandonly,thisisalsoonepartthatthepeoplecomprehendmoreandeasily,inalotofequipmentses,thepeoplehavealreadynolongerhopedtoseetoomanycontrolbuttons,theydamagenotonlyandeasilyandproducetheartificialerroreasiest,smallisnotamainerrorperhapsyoucanstillaccept;Butleadevenisafatalerrorgreatlyiswhatwecan'tistolerantof.Newtechniquealwaysforbringingmoresafeandconvenientoperationforus,makewealotofproblemsforfaceonsweepbutlight,doyouunderstandtheHMI?SaystheHMIhereyoubasicallynotclearwhatitis,alsohavenointerestunderstanding,changeoneinsidetextexplainsitintothetouchtoholdorman-machineinterfaceyouknew,itcombineswiththePLCtoourlargerspace.HMIthecontrolnotonlyonlyisreducedthecontrolpressbutton,increasethevividofthecontrol,moremainofitiscansequenceof,andatcanthechangedatainputtooutputthefeedbackwithdata,controlinthetemperaturecurveofimitatebutalsocankeepthemanifestationofviewtocomeout.Andcanwritethefunctionhelpprocedurethroughaplaittoprovidethehelpofvariouswhatliesinone'spower,theonewhomakeoperatereducestheotioseerror.CurrentlytheHMIfactoryisalsomoreandmore,thefunctionisalsomoreandmorestrong,thepriceisalsomoreandmorelow,thenoodlesoftheusagearewidemoreandmore.TheHMIforegroundcansaythatthink°tobegoodvery.Atalotofsituations,thelistisisasmoothmovementthatcan'tguaranteetheequipmentsbythecontrolofthesinglemachine,butpasstheinformationexchangesoftheequipmentsandequipmentstoattaintheresultthatwewant.Forexampleforepackandtheexaminationoftheempressworkpreface,wewillarrivewrappinginformationfeedbacktoexaminetheplace,andexaminetheinformationoftheplacetoalsowantthefeedbacktopacking.Passtheinformationsharethustomakeboththechainconnect,becomingatotalbody,thematchofyourthatthusmakeismoreclose,ateachotherattaintoreflecttheresultthatmutuallyflick.ThePLCcorrespondencehasalreadycomemoremorebodynowitsvalue,atthePLCandcorrespondencebetweenPLCs,canpassthecommunicationoftheinformationandtheshareofthedatastoguaranteethatoftheequipmentsmoderatesmutually,theresultthatarrivealreadytorepairwitheachother.DataconversiontheadoptionRS232betweenPLCconnecttocometothetransmissiondata,buttheRS232pickupapeopleandcanguarantee10metersonlyofdeliverthedistance,ifinthedistanceof1000meterswecanpasstheRS485tocarryonthecorrespondence,thelongerdistancecanpasstheMODELonlytocarryondeliver.ThePLCdatatransmissionisjusttobecalledaformtoitinapieceofandcontinuousaddressthatthedataoftheinnerpartdeliverstheotherparty,we,thePLCoftheotherpartypassestoreaddatainthewatchtocarryontheoperation.Ifthedatathatdatainthewatchisatoestablishgenerally,thatisjustthegeneraldatatransmission,forexampletodayofoilpricerise,Iwanttodeliverthepriceoftheoilpricetolosetheoilallyonboard,thatistheshareofthedata;ButtakedatainthewatchforaninstructionprocedurethatcontrolsthePLC,thathadthedifficultyverymuch,forexampleyouhavetocontrolonepedestalrobottopresstheactionworkthatyouimagine,youwilldrawupforittheformthataprocedurecombinewiththedatasendsouttopassby.Theformthatinformationtransportcontainsinglework,thehalfaworkandthedifferenceofaworkses.Themeaningofthesingleworkalsoistosayboth,acansendoutonly,butacanreceiveonly,forexampleaspyhecanreceivethedesignationofthesuperioronly,butcan'tgivethesuperiorreply;Aworkofhalfisalso2andcancansendoutsimilartoacceptthedata,butcan'tsendoutandacceptatthesametime,forexamplewhenyoumakeaphonecallistocan'tanswerthephone,theotherpartyalso;Butwholepairworksisbothcansendoutandacceptthedata,andcansendoutandacceptatthesametime.BeliketheInternetisatypicalexample.Theprocessthatinformationtransportalsohassynchronousanddifferentstepcent:Thedatalineandtheclocklinesaresynchronouswhensynchronousmeaninglieinsendingoutthedata,isalsothedatasignalandtheclocksignalstobecarryonbytheCPUtosendoutatthesametime,thisneedstoallwantthespecializedclocksignaleachothertocarryonthetransmissionandconnecttosend,andisconstrained,thecharacteristicsofthiskindofmethodliesinitsspeedveryquick,butcorrespondworktimeoftakeuptheCPUandalsowanttobelongoppositely,atthesametimethetechniquedifficultyalsoverybig.Itsrequestliesincan'tinghaveanerrormarginsinadatasdeliver,otherwisethewholepieceaccordingtocomparetheoccurrencemistake,thisonthehardwareisabiggerdifficulty.Appliedmoreandmoreextensiveinsomeappropriativeequipmentses,beliketheappropriativemedicaltreatmentequipments,thenumericalsignalequipments...etc.,incomparetheonedatadeliver,itsresultisverygood.Andthedifferentstepisanapplicationthemostextensive,thisreceivebenefitinitoftechniquedifficultyisoppositeandwanttobesmall,atthesametimenotneedtopreparethespecializedclocksignal,itscharacteristicstoliein,itsdataispartition,thelong-lostsendoutandaccept,betheCPUistoobusyoftimecangrindtoastopsextowork,alsoreducedthedifficultyonthehardware,thedatathrowtoloseatthesametimeoppositewanttobelittle,wecanpasstheexaminationofthedatatoobservewhetherthedatathatwesendouthasthemistakeornot,belikestrangeaccidentallythemethod,tiredadditionandeightefficaciesmethodetc.,canusetohelpswhetherthedatathatweexaminetosendouthaveornotthemistakeoccurrence,passthefeedbacktocarryonthediscriminator.Alineoftransmissionoftheinformationcontainastringofandcombinethecentof:TheusualPLCis8machines,certainlyalsohaving16machines.Wecanbeanatthetimeofsendingoutthedataasendouttotheotherparty,alsocanbe88sendoutthedatatotheotherparty,anand8differentiationsesarealsotheasthatwesaytosendoutthedataandcombinesendsoutthedata.Aspeedismoreandslowly,butaslongas2orthreelinescansolveproblem,andcanusethetelephonelinetocarryonthelongrangecontrol.Butcombinetheosculartransmissionspeedisveryquickof,itisastringofoscularof25600%,occupytheadvantageintheshortdistance,theinviewofthefactTTLelectricityiseven,beinglimitedbythescopeofonemetergenerally,itcombineunwellusedforthedatatransmissionofthelongpull,thusthecostistooexpensive.Underalotofcircumstanceswearetotaltoliketoadoptthestringtocombinetheconversionchiptocarryondeliver,underthiskindofcircumstancenotneedustocarryontodeposittedthemachinetoestablishtooandcomplicatedly,butcarryonthedataexchangesthroughthedatatransmissioninstructiondirectly,butisnotaveryviablewayinthecorrespondence,becausethePLCoftheotherpartymusthasbeenwaitforyourdataexportationatthetimeofsendingoutthedata,itcan'tdootherworks.Whenyouarereadingthebook,youhearsomeoneknockondoor,youstoptostartupofaffair,openthedoorandcombinetocontinuewiththeonewhoknockondooradialogue,thetelephoneofthistimerang,yousignalhinttoconnectatelephone,afterconnectingthetelephonethrough,returnoverdocometogetherknockondoortohaveaconversation,afterdialoguecomplete,youcontinueagaintoseeyourbook,thiskindofcircumstancewearecalledtheinterruptiontoit,ithastheauthority,alsohavingsexofhavetheinitiative,thePLChadsuchfunction.Itscharacteristicslieinusandmaymeettheurgentlyabruptaffairsintheoperationprocessoftheequipments,wewanttostoptostartimmediatelyupofwork,thewhereaboutsmanagesthemoreimportantaffair,thiskindofcircumstanceisweusuallymeetof,PLCwhilecarryouturgentmission,totalwillkeepthecurrentappearancefirst,forexampletheaddressoftheprocedure,CPUoftiredaddthemachinedataetc.,beliketotostickdownwhichthebookthatweseeiswhenweopenthedoorthepageorsimplymakeamark,becausewetreatandwouldstillneedtocontinueimmediatelyafterbookofseethebehind.TheCPUalwaysdoestheaffairthatshoulddoaccordingtoourwill,butyourmistakeofgiveitanaffair,italsowouldbesametodo,thiswemustnotice.Theinterruptionisnotonlya,sometimesexistingjointlywiththehourseveralinsidebreak,breakofftohavethepreferredClass,theywillcarryouttheinterruptionofthehigherClassaccordingtoperson'srequest.Thiskindofbreaksoffthemediuminterruptiontoalsobecametobreakofftheset.TheClassthatcertainlybreakoffisrelevantaccordingtovariousresourcesofCPUwithinternalPLC,alsofollowingaheapofcapacitysizeofalsorelevantfasten.Thecontentsthatbreakoffhasalotofkinds,forexampletheexteriorbreakoff,correspondenceinofsendoutandaccepttheinterruptionandsettleandtheclockthatcountbreakoff,stillhavetheWDTtoresettheinterruptionetc.,theyenrichedtheCPUtorespondtothecategorywhilehandlevariousbusiness.Speakthusperhapsyoucan'tcomprehendtheinternalstructureandoperationordersoftheinterruptioncompletelyalso,wedoaverysmallexampletoexplain.Eachequipmentsalwayswillnotforgetabutton,italsoisatwemeettheurgentcircumstanceuseof,thatisnastytostopthebutton.WhenwemeettheHumanbodytroubleandsurprisedcircumstancesweaslongaspressit,themachinestopsalloperationsimmediately,andwaitforprocessingtheoversurprisedempressrecovertheoperationagain.NastystoptheinternalI/OoftheinternalCPUofthebuttonconjunctionPLCtoconnectup,betopressbuttonanexteriortotriggersignalforCPU,theCPUcarriesontotheI/Otoexamineagain,beingtoconfirmtohavetheexteriortotriggerthesignal,CPUprotectionthespotbreaksoffprocedurecountsthemachineturnthehomologousexteriorI/Oautomaticallyintheproceduretogotoalso,beexteriorinterruptionprocedureprocessingcomplete,theprocedurecountsthemachinetoreturnthemainproceduretocontinuetowork.Have1:00canwhattoexplainiswegenerallywouldnastystopthebuttonofexteriorbreakofftorisetothetallestClass,thusguaranteethesafety.Whenweareworkaworkpiece,givingthePLCasignal,countingPLCinnerpartthemachineadd1tocomputeusforadayofworkload,acountthemachineandcansolveprobleminbrief,certainlytheyalsocankeepthedataundertheconditionofdroppingtheelectricity,urgingthedatanottothrowtolose,thisisalsowhatwehopeearnestly.ThePLCstillhasthefunctionthatthehighclasscountsthemachine,beinguswhileacceptsomedatasofhighspeed,thehighspeedthatheresayisthedataoftheinallaspectstinysecondclass,forexamplethebarcodescannerisscanningthedatacontinuously,calculatinghigh-speedsignalofthedataprocessorDSPetc.,wewilladoptthehighclasstocountthemachinetohelpwecarryoncount.ItatthePLCcarriesouttheprocedureoncediscoverthatthehighclasscountsthemachinetoshouldofinterruption,willletgooftheworkonthehandimmediately.Thetrapezoiddiagramprocedurethatpassesbytoweavethedistanceagainexplainsthehighclassforustocarryoutproceduretocountmachinewouldautomaticperformancetoshouldofwork,thusrisetheClassthatthehighclasscountsthemachinetohighoneClass.Youheardtoomanythisphrasesperhaps:"crash",themeaningthatismostlyisaworkloadofCPUtoleadgreatly,theinternalresourcesshortageetc.thecircumstancecan'tresultinprocedurecirculate.ThePLCalsohasthesimilarcircumstance,thereisawatchdogWDTintheinnerpartofPLC,wecanestablishtimethataprocedureofWDTcirculate,beingtoappeartheproceduretojumptoturnthemistakeintheproceduremovementprocessortheprocedureisbusy,movementtimeoftheprocedureexceedsWDTconstitutiontime,theCPUturnbuttheWDTresettheappearance.Theprocedurerestartsthemovement,butwillnotcarryonthebreakagetotheinterruption.ThePLCdevelopmenthasalreadyenteredfornetworkagesofcorrespondencefromthemodeoftheone,andtogetherotherworkscontrolthenetplankandI/Ocardplankstocarryontheshareeasily.Astatesoftwarecanpassallsehardwareslink,moreanimationpictureofkeeptheviewtocarriesonthecontrol,andcanspasstheInternettocarryonthecontrolintheforeignland,theblast-offthatisliketheabsolutebeingboatNo.5istoadoptthiskindofwaytomakeairshipgoupthesky.Thedevelopmentofthehigherlayerneedsourcontinuousefforttoobtain.ThePLCemergencehasalreadyaffectedafewpersonsfully,wealsoobtainedmoreknowledgeandpreceptsfromthetoponeexperienceofthegeneration,comingtothecontinuousdevelopmentPLCtechnique,pushittowardhigherwavetide.附录3：中文译文可编程控制器技术讨论与未来发展随着时代的发展,当今的技术也日趋完善、竞争愈演愈烈，单靠人工的操作已不能满足于目前的制造业前景，也无法保证更高质量的要求和高新技术企业的形象。人们在生产实践中看到，自动化给人们带来了极大的便利和产品质量上的保证,同时也减轻了人员的劳动强度，减少了人员上的编制。在许多复杂的生产过程中难以实现的目标控制、整体优化、最佳决策等,熟练的操作工、技术人员或专家、管理者却能够容易判断和操作，可以获得满意的效果。人工智能的研究目标正是利用计算机来实现、模拟这些智能行为，通过人脑与计算机协调工作，以人机结合的模式，为解决十分复杂的问题寻找最佳的途径。我们在各种场合看到了继电器连接的控制，那已经是时代的过去，如今的继电器只能作为低端的基层控制模块或者简单的设备中使用到；而PLC的出现也成为了划时代的主题，通过极其稳定的硬件穿插灵活的软件控制，使得自动化走向了新的高潮。PLC的最大特点在于：电气工程师已不再电气的硬件上花费太多的心计，只要将按钮开关或感应器的输入点连接到PLC的输入点上就能解决问题，通过输出点连接接触器或继电器来控制大功率的启动设备，而小功率的输出设备直接连接就可以。PLC的内部包含了具有中央处理器的CPU，并带有外部I/O口扩展的I/O接口地址和存储器三大块组成，CPU的核心是由一个或者多个累加器组成，它们具有逻辑的数学运算能力，并能读取程序存储器的内容通过计算后去驱动相应的存储器和I/O接口；I/O口将内部累加器和外部的输入和输出系统连接起来，并将相关的数据存入程序存储器或者数据存储器中；存储器可以将I/O口输入的数据存入存储器中，并在工作时调转到累加器和I/O接口上，存储器分程序存储器ROM和数据存储器RAM,ROM可以将数据永久的存入存储器中，而RAM只能作为CPU计算时临时计算使用的缓冲空间。PLC的抗干扰是极其优秀的，我们根本不用去关心它的使用寿命和工作场合的恶劣，这些所有的问题已不再成为我们失败的主题，而留给我们的是关心如何来利用PLC的内部资源为我们加强设备的控制能力，使我们的设备更加的柔性。PLC的语言并不是我们所想象的汇编语言或C语言来进行编程，而是采用原有的继电器控制的梯形图，使得电气工程师在编写程序时很容易就理解了PLC的语言，而且很多的非电气专业人士也对PLC很快认识并深入。以上仅仅是PLC的优点之一，这也是人们比较容易理解的一部分，在很多的设备中，人们已不再希望看到太多的控制按钮，它们不但容易损坏而且极易产生人为的失误，小的并不是主要的失误也许你还能够接受；但过大的甚至是致命的失误是我们无法容忍的。新的技术总是为了给我们带来更安全和便捷的操作，使得我们面临的一大堆问题一扫而光，你有了解过HMI吗？这里说HMI你根本不清楚它是什么，也没有兴趣了解，换一个中文把它说明为触摸屏或者人机界面你就知道了，它和PLC的结合给了我们更大的空间。HMI控制不仅仅是减少了控制按钮，增加控制的灵活性，更主要的它是可顺序性的，而且在能够改变数据输入和数据输出反馈，在温度控制曲线的模拟也能直观的显示出来。并且能够通过编写功能帮助程序来提供各种力所能及的帮助，使得操作者减少不必要的失误。HMI的厂商目前也越来越多，功能也越来越强，价格也越来越低，使用的面越来越广。HMI的前景可以说十分的看好。在很多场合，单靠单机的控制是无法保证设备的顺畅运行，而通过设备与设备的信息交流达到我们想要的效果。比如在前包装和后工序的检测，我们就要将包装的信息反馈到检测处，而检测处的信息也要反馈到包装来。这样通过信息共享来使得两者之间链接起来，形成一个共体，从而使的两者间的配合更加的紧密，在彼此间达到映影相挥的效果。PLC的通信已经愈来愈体现它的价值，在PLC与PLC之间的通信，能够通过信息的沟通和数据的共享来保证设备之间的相互协调，已达到互补的效果。PLC之间的数据转换采用RS232接口来传送数据，而RS232接口只能保证10米的传输距离，如果在1000米的距离内我们可以通过RS485来进行通信，更长的距离只能通过MODEL来进行传输。PLC的数据传送只是将内部的数据传送到对方的一块连续的地址中，我们把它称为一个表，对方的PLC通过读取表中的数据来进行操作。如果表中的数据是一个一般设置的数据的话，那只是一般的数据传送，比如今天的油价上升了，我要把油价的价格传送到所有的输油机上，那就是数据的共享；而当表中的数据是一段控制PLC的指令程序，那就很有难度了，比如你要控制一台机器人来按你想象的动作工作，你会给它编制一段程序并以