基于PLC温度控制系统的设计论文

南京工程学院自动化学院本科毕业设计（论文）题目：基于PLC温度控制系统的设计专业：测控技术与仪器班级：测控072学号：xxx学生姓名：xxx指导教师：xxx教授xxx副教授起迄日期：xxx设计地点：xxxGraduationDesign(Thesis)TheDesignOfTheTemperatureExaminationInPLCTemperatureControlSystemByWANGZhuJieSupervisedbyProf.XIAQingGuanAssociateProf.LUHongSchoolofAutomationNanjingInstituteofTechnologyJune,2011南京工程学院自动化学院本科毕业设计（论文）I摘要本文介绍基于PLC的温度控制系统的设计，包括A/D转换、标度变换、温度检测环节、积分分离PID算法以及过零数字触发电路的设计。主要内容：实际温度经温度传感器检测，得到模拟电压值，模拟量再经A/D转换和标度变换后得到实际炉温。数字控制器根据恒温给定值与实际温度的偏差e（k）按积分分离PID控制算法，得到输出控制量u（k），控制可控硅导通时间，调节炉温的变化使之与给定恒温值一致。达到恒温控制目的。本系统对温度检测和调节环节做了进一步的优化设计，使该系统更实用、易行和可靠，同时也提高了产品质量和减轻人工劳力负担。它在实际应用中具有一定参考价值。关键词：温度检测；温度传感器；A/D转换；PID南京工程学院自动化学院本科毕业设计（论文）IIABSTRACTTheintroductionoftemperature-basedPLCcontrolsystemdesign,includingA/Dconversion,scalingtransformation,temperaturecheckinglinks,scoringazeroseparationPIDalgorithmsanddigitaltriggeringcircuitdesign.Mainelements:theactualtemperatureofthetesttemperaturesensors,analogvoltageisthevalue,volumeviasimulationA/Dafterhisconversionandscalingpracticalfurnacetemperature.Digitalsignalcontrollerswillbeunderconstanttemperaturetothevalueandtheactualtemperaturedeviationse(k)byscoringseparationPIDcontrolalgorithms,withthevolumeofexportcontrolu(k),lead-timesilicon-controlledrectifiercontrol,regulatefurnacetemperaturechangestothecurrentagreementwiththegivenconstanttemperature.Achievethermostaticcontrolpurposes.Temperatureofthesystemtodofurthertestingandregulatoryaspectsofthedesignoptimization,enablingthesystemmorepracticalandeasyOKandreliable,whilealsoraisingproductqualityandreducingtheburdenofmanuallabor.Itmusthavepracticalapplicationinreferencevalue.Keywords：temperaturetesting;Temperaturesensors;A/Dconversion;PID南京工程学院自动化学院本科毕业设计（论文）III目录前言.............................................................................................................1第一章系统总体方案..............................................................................2第二章系统硬件设计..............................................................................42.1PLC选择.....................................................................................................42.1.1FX2N-48MR-001PLC.........................................................................42.1.2FX2N-4AD特殊功能模块.................................................................52.2硬件电路设计............................................................................................72.2.1温度值给定电路...............................................................................82.2.2温度检测电路...................................................................................82.2.3过零检测电路.................................................................................102.2.4晶闸管电功率控制电路..................................................................102.2.5脉冲输出通道.................................................................................132.2.6报警指示与显示电路......................................................................132.2.7复位电路.........................................................................................14第三章系统软件设计............................................................................153.1编程与通信软件的使用..........................................................................153.2程序设计..................................................................................................163.3系统程序流程图......................................................................................173.4控制系统控制程序的开发......................................................................183.4.1温度设计.........................................................................................183.4.2A/D转换功能模块..........................................................................183.4.3标度变换程序.................................................................................203.4.4恒温控制程序.................................................................................203.4.5数字触发器程序设计.....................................................................243.4.6显示程序.........................................................................................263.4.7恒温指示程序.................................................................................273.4.8报警程序.........................................................................................27第四章总结与展望................................................................................284.1总结........................................................................................................284.2展望........................................................................................................28致谢............................................................................................................29南京工程学院自动化学院本科毕业设计（论文）IV参考文献.....................................................................................................30附录一：三菱FX系列PLC指令一览表...............................................................31附录二：热电偶温度传感器和信号放大器............................................................33附录三：系统程序（梯形图）...............................