水塔水位PID控制系统设计、设计图

I水塔水位PID控制系统设计摘要供水是一个关系国计民生的重要产业。随着社会的发展和人民生活水平的提高，对城市供水提出了更高的要求，有一个水箱需要维持一定的水位，该水塔里的水以变化的速度流出。这就需要有一个输入控制液体阀以不同的速度给水塔供水，以维持水位的变化，这样才能使水塔不断水。研究设计的基于PLC控制的水塔水位PID供水系统,以西门子公司的S7-200系列中PLC-CPU226为基础，结合模拟量模块EM235、液位传感器、输入控制液压阀、输出控制液压阀等，组成一个基于S7-200系列中PLC-CPU226的水塔水位控制系统，能完成逻辑控制、水位调节和数据采样等功能,实现对水塔的水位进行控制及检测。在设计中大量运用PLC中PID来实现水塔水位的控制，为了精确地实现对水位的控制，建立成闭环控制系统，实现了水塔中的进、出水的水位自动控制。关键词：可编程控制器PLC，水塔水位，PID控制IIWATERTOWERSPIDCONTROLSYSTEMDESIGNABSTRACTWatersupplyisanimportantindustryofthepeople'slivelihood.Withthesocialdevelopmentandpeople'slivingstandards,urbanwatersupplytoahigherdemand,thereisaneedtomaintainacertainwatertankwaterlevel,thewatertowersinordertochangethespeedoftheoutflow.Thisrequiresaliquidinputcontrolvalvetothedifferentspeedsofwatertowersinordertomaintainthewaterlevelchanges,sothatcontinuouswatertowers.PLC-basedresearchanddesignofthetowerslevelPIDcontrolthewatersupplysystemtoSiemensS7-200seriesPLC-CPU226-basedlightsimulationmoduleEM235,liquidlevelsensors,typeofhydrauliccontrolvalve,hydraulicvalvecontroloutputandsoon,basedontheformationofaS7-200seriesofthePCL-CPU226towerswaterlevelcontrolsystem,tocompletelogiccontrol,waterregulationandfunctionofdatasampling,etc.,toachievethelevelofthewatertowerforcontrolanddetection.InthedesignofPIDmakeextensiveuseofPLCtoachievethelevelofcontroltowers,inordertoachievepreciselevelofcontrol,intoaclosed-loopcontrolsystem,thewatertowerinprogress,thewaterlevelofautomation.Keywords:ProgrammableLogicControllerPLC,WaterTowers,PIDControlIII目录前言...........................................................................................................1第1章水塔水位自动控制系统的概述...................................................21.1水位控制系统现状与发展............................................................21.2水塔水位自动控制系统的组成....................................................21.3水位控制系统效率及运行模式分析............................................3第2章PLC结构和工作原理..................................................................42.1PLC组成与基本结构...................................................................42.1.1PLC的系统结构..................................................................42.1.2PLC的基本工作原理..........................................................52.2PLC的主要应用...........................................................................62.3S7-200系列可编程控制器..........................................................62.3.1S7-200PLC系统组成..........................................................72.3.1S7-200系列PLC元件功能.................................................72.4PID控制器简介............................................................................92.4.1PID控制器的结构及原理...................................................92.4.2数字式PID控制................................................................102.4.3数字式PID控制的实现....................................................12第3章水塔水位控制系统方案设计.....................................................143.1系统的工作原理..........................................................................143.1.1设计分析.............................................................................143.1.2可行性试验.........................................................................153.1.3可行性分析.........................................................................163.2水位闭环控制系统......................................................................163.2.1PLC的选择........................................................................183.2.2供水的控制方法.................................................................18第4章PLC中PID控制器的实现........................................................204.1PID算法......................................................................................204.2PID应用......................................................................................214.3PLC实现PID控制的方式.........................................................214.4PLCPID控制器的实现..............................................................22IV4.5PID指令及回路表......................................................................24第5章系统硬件开发设计.....................................................................265.1可编程控制器的选型..................................................................265.3EM235模拟量模块.....................................................................285.3.1EM235的安装使用............................................................295.3.2EM235的工作程序编制....................................................295.4硬件连接图..................................................................................305.5控制系统I/O地址分配..............................................................30第6章系统软件应用设计.....................................................................316.1水位PID控制的逻辑设计.........................................................316.2梯形图编程..................................................................................356.3控制程序......................................................................................386.4联机..............................................................................................39结论.................