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中原工学院信息商务学院毕业论文（设计）I摘要在工业和农业生产过程中，经常需要测量和控制水位。在日常生活中水位控制应用也相当广泛，如水塔、地下水、水电站的控制。然而，随着世界人口不断增长，增加了人们的生活用水，过去由于频繁操作使用的继电器使水位自动控制系统会产生机械磨损，即不方便维护和更新，也不能满足实际需求。本论文使用的是西门子S7-200系列PLC可编程控制器作为一个小水塔水位自动控制系统的核心，涉及到需要分析水塔水位功能的自动控制系统。主要方法是通过水塔中的液位传感器来检测实际的水位，并通过PLC的CPU的智能扩展模块将得到的信息通过模拟量的转换传送给变频器，以控制水泵电动机的操作。完成整个系统的自动供水过程。如果水位低于或高于设定值时，危险警告信号将被发出。本论文给出设计的基础上很好地执行PLC塔液位控制系统的具体过程。并使用组态王软件画出水塔自动供水的动态流程。关键字：水塔水位控制系统，PLC，液位传感器，组态王中原工学院信息商务学院毕业论文（设计）IIAbstractIntheindustrialandagriculturalproductionprocess,oftenneedtomeasureandcontrolthewaterlevel.Ineverydaylifelevelcontrolapplicationsarequiteextensive,suchascontroltowers,groundwater,hydropower.However,withthegrowingworldpopulation,increasingpeople'slivingwater,inthepastduetotheoperationoftherelayfrequentlyusedtomakethewaterlevelautomaticcontrolsystemgeneratesmechanicalwear,whichisnotconvenienttomaintainandupdate,cannotmeettheactualdemand.Inthispaper,usingaSiemensS7-200seriesPLCprogrammablecontrollerasthecoreofasmallwatertowerwaterlevelautomaticcontrolsystem,involvingtheneedtoanalyzewatertowerfeaturesautomaticcontrolsystem.Themainmethodisthroughthetowerlevelsensortodetecttheactualwaterlevel,andthroughthePLCCPUintelligentexpansionmodulewilltransmittheinformationobtainedbytheconversiontoanalogconvertertocontrolthepumpmotoroperation.Tocompletetheentireprocessautomaticwatersupplysystem.Ifthewaterlevelislowerorhigherthanthesetvalue,thehazardwarningsignalwillbeissued.ThispapergivesspecificprocessesperformwellPLCtowerlevelcontrolsystemonthebasisofdesign.Configurationsoftwaretodrawanduseautomaticwatertowerdynamicprocesses.Keywords:towerwaterlevelcontrolsystem,PLC,configurationking,levelsensors中原工学院信息商务学院毕业论文（设计）III目录1.引言.................................................................................................................11.1设计背景及意义...................................................................................11.2国内外研究现状...................................................................................21.3主要研究内容.......................................................................................22.水塔水位控制系统方案设计.........................................................................42.1设计方案对比..........................................................................................42.1.1传统的水位控制方案...................................................................42.1.2PLC控制水塔液位的概述...........................................................42.1.3对比的结果...................................................................................52.2基于PLC的供水方案设计....................................................................52.2.1系统控制要求..............................................................................52.2.2设计分析示意图...........................................................................72.3确定设计方案.......................................................................................83.水塔控制系统硬件设计.................................................................................93.1简述..........................................................................................................93.1.1PLC的定义...................................................................................93.1.2可编程控制器的分类..................................................................93.2PLC控制系统设计的一般步骤.............................................................93.3可编程控制器的工作原理...................................................................103.4PLC的选型......................................................................................113.5CPU224应用介绍.................................................................................123.6PLC扩展模块的选择...........................................................................123.6.1交直流输出模块.........................................................................123.6.2模拟量输出模块.........................................................................133.7系统的I/O分配表................................................................................143.8电机及驱动线路...................................................................................153.9检测元件应用设计................................................................................164.控制系统软件设计.......................................................................................184.1控制程序流程图...................................................................................184.1.1程序流程图分析：.....................................................................194.2控制程序设计.......................................................................................195.组态王仿真的设计...........................................................................................23中原工学院信息商务学院毕业论文（设计）IV5.1组态软件概述.....................................................................................235.2系统监控界面设计................................................................................235.2.1新建工程....................................................................................235.2.2定义变量.....................................................