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青岛农业大学本科生毕业论文（设计）题目：基于PLC的太阳能热水器自动控制系统的设计姓名：王云志学院：机电工程学院专业：电气工程及其自动化班级：2003.2学号：0320030290指导老师：李胜多完成时间：2007年6月18日2007年6月18日青岛农业大学机电工程学院本科毕业设计I基于PLC的太阳能热水器自动控制系统的设计摘要本课题研究了可编程控制器（PLC）在太阳能热水器自动控制系统中的应用。重点研究了系统的硬件构成及系统软件的设计过程。指出了PLC设计的关键主要是能满足基本控制功能,并考虑维护的方便性、系统可扩展性等。在本文中经研究确定出了系统的各个工序，绘制了系统的工艺流程图；进行了系统的I/O分配和PLC的选型；根据系统设计要求设计绘制了系统的控制梯形图；绘制出了控制系统电气原理图和接线图等。通过用PLC对太阳能热水器自动控制系统的改造，大大减少了系统对其它元器件的使用，使系统接线简单、检修维护方便快捷、可靠性提高，增进了系统的先进性。关键词:PLC；太阳能；自动控制系统；热水器青岛农业大学机电工程学院本科毕业设计IIDesignofSolarWaterHeaterAutomaticControlSystemBasedonPLCAbstractApplicationofPLCinsolarwaterheaterautomaticcontrolsystemisresearchedinthispaper.Thecontentofthispaperontheprocessofsystemhardwareconstitutionandthesystemsoftwaredesignisemphasized.AndthekeyofPLCdesignthatistosatisfythebasiccontrolfunctionispointedout,meanwhilemaintenanceconvenienceandsystemextensionarealsoconsiderated.Thecontentofthispaperisdividedintofourparts.Inthefirstpart,theprocedureofthesystemisestablished,andthenthetreatmentflowchartisdrawedout;Inthesecondpart,TheaddressofI/Oisresigned.andthesuitablePLCtypeischoosed.Thethirdpart,thecontrolladderdiagramisdesignedaccordingtotherequirement;Intheend,theelectricalprinciplediagramandtheinterconnectiondiagramaredrawn.Throughthedesignofthesolarwaterheaterautomaticcontrolsystem,thecomponentsthatisusedinthesolarwaterheaterautomaticcontrolsystemaredecreased.Theperformanceofthesystemislifted,andithasthefeaturesuchassimplyinterconnection,rapidandeasyfaultdetectingandmaintenance,andhighreliability.Inaword,thesystembecomesmoreadvancedbecauseofmydesign.Keywords:PLC;solar;automaticcontrolsystem;waterheater目录摘要........................................................................................IAbstract.................................................................................................................II第一章绪论...............................................................................11.1本课题研究的目的、意义..........................................................................................11.2国内外研究现状...........................................................................................................11.2.1国内研究现状.......................................................................................................................11.2.2国外研究现状.......................................................................................................................21.3目前我国太阳能热水器的种类..................................................................................21.3.1平板式太阳热水器...............................................................................................................21.3.2全玻璃真空管式热水器.......................................................................................................31.3.3热管式太阳能热水器...........................................................................................................41.3.4热管—真空管式太阳能热水器...........................................................................................41.4研究的内容..................................................................................................................5第二章全玻璃真空管式太阳能热水器的综述.................................................62.1太阳能热水器系统功能简介......................................................................................62.1.1太阳能热水器组成、原理和工作过程...............................................................................72.1.2太阳能热水器各单元介绍...................................................................................................82.1.3系统的要求.........................................................................................................................102.2可编程控制器（PLC）简介......................................................................................102.2.1PLC的发展历史..................................................................................................................112.2.2可编程序控制器的工作原理.............................................................................................112.2.3可编程控制器的的特点.....................................................................................................122.2.4PLC的分类..........................................................................................................................132.2.5可编程控制器应用领域.....................................................................................................14第三章热水器控制系统的设计方案................................................................163.1系统硬件的设计方案.................................................................................................163.1.1PLC的选型..........................................................................................................................163.1.2PLC硬件控制框图..............................................................................................................173.1.3各单元功能作用介绍.........................................................................................................173.1.4PLC的端口分配...............................................................................................