机电一体化-毕业论文

毕业设计（论文）报告纸I┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊毕业论文课题名称十字路口交通信号灯控制分院/专业班级学号学生姓名指导教师：2013年5月31日毕业设计（论文）报告纸II┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊摘要自从交通灯诞生以来，其内部的电路控制系统就不断的被改进。设计方法也开始多种多样，从而使交通灯显得更加智能化。作为交通控制的重要组成部份的交通信号灯也应适合社会实际情况。这是选择制作十字路口交通灯的目的。可编程控制器(PLC)以微处理器为核心，普遍采用依据继电接触器控制系统电气原理图编制的梯形图语言进行程序设计，编程容易，功能扩展方便，修改灵活,而且结构简单，抗干扰能力强。西门子可编程控制器指令丰富，可以接各种输出、输入扩充设备，有丰富的特殊扩展设备，其中的模拟输入设备和通信设备更是符合交通灯控制系统的要求与特点，能够方便地联网通信。本文选择西门子可编程控制器S7-200为核心部件，着重进行硬件接口设计，利用梯形图和语句表进行编程，实现了十字路口交通灯控制系统的自动化。每个路口采用LED数码管，倒计时显示，使得计时功能更加直观。关键词：西门子；PLC；交通信号灯；控制；LED；倒计时毕业设计（论文）报告纸III┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊ABSTRACTSincetheinceptionoftrafficlights,itsinternalcontrolsystemonthecircuittobecontinuouslyimproved.Designbegantodiversity,sothatevenmoreintelligenttrafficlights.Trafficcontrolasanintegralpartofthetrafficsignalsshouldalsobesuitablefortheactualsocialsituation.Thisisthechoicemakingcrossroads,trafficlights.ProgrammableLogicController(PLC)microprocessorcore,basedoncommonlyusedelectricalrelaycontactorcontrolsystemladderdiagramcompiledprogramminglanguage,programmingiseasy,convenientfeaturesextend,modifyandflexible,andsimple,anti-interferenceability.SiemensPLCinstructionrich,youcantakeavarietyofoutput,inputexpansiondevicewithrichspecialexpansiondevices,includinganaloginputdevicesandcommunicationsequipmentisaccordingtothetrafficlightcontrolsystemrequirementsandfeatures,theabilitytoeasilynetworkcommunication.ThischoiceofSiemensS7-200programmablecontrollerasthecorecomponents,hardwareinterfacedesignfocusesontheuseofladderandstatementstableprogramming,acrossroadsoftrafficlightcontrolsystemautomation.EachintersectionwithLEDdigitaltube,countdowndisplay,makingtimingmoreintuitivefunctionality.【KeyWord】:siemens;PLC;trafficlights;control;LED;countdown毕业设计（论文）报告纸IV┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊目录摘要.......................................................................................................................................................IIABSTRACT............................................................................................................................................III第一章绪论.............................................................................................................................................11.1引言...........................................................................................................................................11.2课题研究目的及意义.................................................................................................................11.3课题主要研究工作.....................................................................................................................21.3本课题的主要内容.....................................................................................................................2第二章PLC的基础.................................................................................................................................32.1PLC的基础和特点.....................................................................................................................32.2PLC的结构和工作原理.............................................................................................................42.2.1PLC的基本结构..............................................................................................................42.2.2PLC的工作原理..............................................................................................................6第三章西门子S7-200系列PLC的硬件单元......................................................................................73.1主机.............................................................................................................................................73.1.1CPU的主要特点.............................................................................................................73.1.2存储系统.........................................................................................................................83.2扩展单元.....................................................................................................................................83.3特殊功能模块.............................................................................................................................93.4内部软元件...............................................................................................................................103.5基本指令....................................................................................................................................11第四章控制方案设计.........................................................................................................................134.1技术控制要求...........................................................................................................................134.2总体方案确定...........................................................................................................................144.2.1方案的原理...................................................................................................................