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1郑州大学毕业设计（论文）题目基于西门子S7-200PLC的温度控制系统设计院系专业年级学生姓名指导教师2013年6月2日I摘要温度是各种工业过程最普遍、最重要的参数之一，温度控制的精度对实验结果或工业生产都会产生重要的影响。传统的温控系统采用温控仪表和继电器式控制柜等进行控制，其主要缺点是结构复杂，体积大，故障率高，通用性差，控制精度低．人机交互困难，自动化程度低．难以满足现代生产加工的需要。随着现代传感技术与控制方法的不断革新和发展，对实时温度控制的精度以及反应快速性的要求越来越高。本文就是基于PLC的温度控制系统设计。本文主要介绍了PLC相关知识、温度控制系统的硬件设计、软件设计，同时对传感技术、PID算法以及调压技术进行了涉及。在硬件上主要采用西门子S7-200系列CPU224XP，K型热电偶传感器及K型热电偶变送器、柱式电压调压器以及EM235模拟量输入输出扩展模块。热电偶作为温度采集元件，采集的信号经温度变送器转换盒放大后送到EM235处理，随后送入PLC进行PID运算，运算结果控制调压器对加热过程进行调节实现自动化控制。关键词温度控制PLCPIDIIAbstractTemperatureisoneofthemostcommonvarietyofindustrialprocesses,themostimportantparameter,theaccuracyoftemperaturecontrolwillhaveanimportantimpactontheresultsorindustrialproduction.Thetemperaturecontrolsystemisadoptedintraditionaltemperaturecontrolmeterandrelaycontrolcabinetcontrol,itsmaindisadvantageisthecomplicatedstructure,bigvolume,highfailurerate,pooruniversality,lowcontrolaccuracy.Human-computerinteractiondifficulties,lowdegreeofautomation.Itisdifficulttomeettheneedsofmodernproductionandprocessing.Withthecontinuousinnovationanddevelopmentofmodernsensortechnologyandcontrolmethod,thehigherofthereal-timetemperaturecontrolprecisionandresponsespeedarerequired.ThisarticleisbasedonthePLCtemperaturecontrolsystemdesign.ThispapermainlyintroducedthePLCrelatedknowledge,thetemperaturecontrolsystemhardwaredesign,softwaredesign,atthesametime,sensortechnology,PIDalgorithmandthepressureregulatingtechnologyisinvolved.ThehardwaremainlyadoptsSiemensS7-200seriesCPU224XP,thecolumnvoltagetypeKthermocouplesensorandKtypethermocoupletemperaturetransmitter,pressureregulatorandEM235analoginputandoutputexpansionmodule.Thermocoupleasthetemperatureacquisitiondevice,thesignalscollectedbythetemperaturetransmitterconversionkitamplifiedtoEM235processing,thensenttoPLCPIDoperation,thecontrolvoltageregulatorisadjustedtorealizeautomaticcontrolofheatingprocesscalculationresults.KeywordstemperaturecontrolPLCPIDIII目录摘要.........................................................................................................................................................IAbstract...................................................................................................................................................II第一章绪论...........................................................................................................................................11.1课题研究背景及意义：..........................................................................................................11.2课题研究的主要内容..............................................................................................................21.3研究技术介绍..........................................................................................................................21.3.1传感检测技术...............................................................................................................21.3.2PLC................................................................................................................................31.3.3上位机...........................................................................................................................31.3.4组态软件.......................................................................................................................4第二章硬件设计...................................................................................................................................52.1硬件配置..................................................................................................................................52.1.1西门子S7-200PLC.......................................................................................................52.1.2热电偶...........................................................................................................................82.1.3电力调整器...................................................................................................................92.2硬件连接................................................................................................................................122.3地址分配表............................................................................................................................13第三章软件设计.................................................................................................................................143.1PID控制程序设计.................................................................................................................143.1.1PID控制内容..............................................................................................................143.1.2PID控制原理（PID算法）.......................................................................................143.1.3PID输入输出值转换..................................................................................................153.1.4PID在PLC中的回路指令.........................................................................................173.1.5PID参数调整的一般步骤....................................................................................