論文題目：基于PLC的城市小區(qū)節(jié)能供水系統(tǒng)學(xué)生姓名：所在院系：機(jī)電學(xué)院所學(xué)專(zhuān)業(yè)：應(yīng)用電子技術(shù)教育導(dǎo)師姓名：完成時(shí)間：摘要1本文介紹了小區(qū)恒壓供水系統(tǒng)的構(gòu)成及工作原理,恒壓供水的控制策略，分析了典型的恒壓供水系統(tǒng)控制方案,闡述了應(yīng)用該恒壓供水系統(tǒng)的經(jīng)濟(jì)效益。系統(tǒng)采用變頻調(diào)速的方式，自動(dòng)調(diào)節(jié)水泵電機(jī)轉(zhuǎn)速，保持供水壓力的恒定，在用水低谷時(shí)投入小流量、降低電耗。系統(tǒng)具有節(jié)能、工作可靠、自動(dòng)化程度高等優(yōu)點(diǎn)，提高了供水質(zhì)量。系統(tǒng)中運(yùn)用了PLC，它是一種固態(tài)電子裝置，利用已存入的程序來(lái)控制機(jī)器的運(yùn)行或工藝的工序。PLC通過(guò)輸入/輸出裝置發(fā)出控制信號(hào)和接受輸入信號(hào)。由于PLC綜合了計(jì)算機(jī)和自動(dòng)化技術(shù)，所以它發(fā)展異常迅猛，大大超過(guò)其出現(xiàn)時(shí)的技術(shù)水平。它不但可以很容易地完成邏輯、順序、定時(shí)、計(jì)數(shù)、數(shù)字運(yùn)算、數(shù)據(jù)處理等功能，而且可以通過(guò)輸入輸出接口建立與各類(lèi)生產(chǎn)機(jī)械數(shù)字量和模擬量的聯(lián)系，從而實(shí)現(xiàn)生產(chǎn)過(guò)程的自動(dòng)控制。關(guān)鍵詞：變頻調(diào)速，恒壓供水，PLC可編程序控制器DESIGNOFCONSTANTPRESSUREWATERSUPPLYCONTROLSYSTEMBASEDPLC2Abstract:ThecompositionandoperationalprincipleofthedistrictconstantPressurewatersupplysystembasedoninverterinthedistrictareintroduced.Thispaperintroduceswatersupplywithconstantpressurecontrolpolicy，cross-sectionanalysiswatersupplywithconstantpressuresystemcontrolschematic,expoundeconomicbenefitinapplicationwatersupplywithconstantpressuresystem.Thesystemadoptsmotorsofwaterpumpsandtokeepthepressconstant.Thissystemcanincreaseswatersupplyquantity.PLCisasolidstatedeviceusedtocontrolmachinemotionorprocessoperationbymeansofastaredprogram.ThePLCsendsoutputcontrolsignalsandreceivesinputsignalsthroughinput/out(I/O)devices.PLCdesignisforbadindustrialenvironmentaluse.Becauseofthecomprehensivecomputerandautomatictechnology，makeitsdevelopmentchangewitheachpassingday，exceedtheengineeringlevelwhileitappearsgreatly.Itcanfinishlogic，order，timing，count，digitaloperation，dataprocessing,etc.functionveryeasily，andcanestablishwithallkindsofconnectionwithanalogquantityofamountofmechanicalfigureproducedthroughtheinput-outputinterface，thusrealizetheautomaticcontroloftheproductionprocess.Keywords:variablefrequencyandspeedregulation，Constantpressurewaterfeeding，PLCProgrammableLogicController啟動(dòng)1#電機(jī)變頻運(yùn)行延時(shí)8S延時(shí)1S2#電機(jī)變頻運(yùn)行延