基于PLC水箱水位监控系统设计

分类号TP273单位代码11395密级学号1505320109学生毕业设计题目基于PLC的水箱水位监控系统的设计作者刘建坤院(系)能源工程学院专业电气工程及其自动化指导教师姬妍答辩日期2017年5月20日榆林学院毕业设计（论文）诚信责任书本人郑重声明：所呈交的毕业设计（论文），是本人在导师的指导下独立进行研究所取得的成果。毕业设计（论文）中凡引用他人已经发表或未发表的成果、数据、观点等，均已明确注明出处。尽我所知，除文中已经注明引用的内容外，本论文不包含任何其他个人或集体已经公开发表或撰写过的研究成果。对本文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明。本人毕业设计（论文）与资料若有不实，愿意承担一切相关的法律责任。论文作者签名:年月日摘要I摘要随着社会的发展，人口的日益增多和人民生活水平的提高，对供水的稳定性提出越来越严苛的要求。以往采用传统的供水系统，不仅占地面积大，供水速度慢，可靠性差，接线也很复杂。当工业生产工艺发生改变时，控制电路就必须重新接线，系统缺乏灵活性、自动化程度低。当今的很多企业都采用可编程逻辑控制器代替传统的控制系统，来提高系统的自动化程度，为企业的生产效率提供了可靠的保障。本设计是基于PLC水箱水位监控系统设计，针对现在大部分水箱自动化程度低，控制过程也相对繁杂等诸多因素，本设计是采用西门子S7-200PLC来对水箱水位监控系统进行控制的，通过液位变送器测得液位转化为电信号变送给PLC中，经过PLC的运算和PID调节把控制信号输出给电动调节阀后，电动调节阀控制阀门的开度来控制液位的恒压供水系统，在利用MCGS组态软件来进行液位控制的实时监控。得到了一个自动化程度较高并且可以通过MCGS组态界面就能简单快捷并灵活多变的控制液位的设计。关键词：水箱液位；PLC；MCGSABSTRACTIIDesignofWaterLevelMonitoringSystemBasedonPLCWaterTankABSTRACTTheincreasingsocialprogress,theincreasingpopulationandtheimprovementofpeople'squalityoflife,thestabilityofthewatersupplymorestringentrequirements.Pastwatersupplysystem,notonlyalargevolume,andwatersupplyefficiencyisslow,wiringisalsoverycomplicated.Whentheindustrialproductionprocesschanges,itmustbewired,lackofflexibility,lowdegreeofautomation.Manyoftoday'senterprisesareusingprogrammablelogiccontrollerinsteadofthetraditionalcontrolsystem,toimprovethedegreeofautomationofthesystemfortheproductionefficiencyoftheenterprisetoprovideareliableguarantee.ThedesignisbasedonPLCwatertankwaterlevelmonitoringsystemdesign,fornowmostofthewatertankislowdegreeofautomation,thecontrolprocessisalsorelativelycomplexandmanyotherfactors,thedesignistheuseofSiemensS7-200PLCwatertankwaterlevelmonitoringsystemtocontrol,throughtheliquidlevelThetransmittermeasuredtheliquidlevelintotheelectricalsignalsenttothePLC,afterthePLCoperationandPIDcontroltocontrolthesignaloutputtotheelectriccontrolvalve,theelectriccontrolvalvecontrolvalveopeningtocontrolthelevelofconstantpressurewatersupplySystem,intheuseofMCGSconfigurationsoftwareforreal-timemonitoringofliquidlevelcontrol.HasbeenahighdegreeofautomationandcanbeconfiguredthroughtheMCGSinterfacecanbesimpleandquickandflexiblecontroloftheliquidleveldesign.Keywords:tanklevel;PLC;MCGS目录IV目录摘要..................................................................................................................................................IABSTRACT.........................................................................................................................................II1绪论...................................................................................................................................................11.1设计的背景与意义................................................................................................................11.2国内外现状............................................................................................................................11.3西门子PLC介绍...................................................................................................................22水箱水位监控系统总体设计方案....................................................................................................32.1系统组成................................................................................................................................32.2系统设计方案.........................................................................................................................33水箱水位控制系统设计....................................................................................................................53.1系统构成................................................................................................................................53.2仪表的选型............................................................................................................................53.2.1CPU选择.....................................................................................................................53.2.2变送器的选择..............................................................................................................63.2.3执行器的选择..............................................................................................................63.2.4水泵的选择..................................................................................................................63.3工作原理................................................................................................................................83.4PID算法.................................................................................................................................84软件设计.........................................................................................................................................114.1软件流程图..........................................................................................................................114.2I/O分配表和PID回路参数表............................................................................................124.3梯形图.............................................................................