基于PLC的三层电梯控制系统设计目录摘要.......................................................1第1章电梯概述..................................................31.1引言........................................................31.2电梯的发展简史..............................................31.3电梯的基本结构..............................................31.4电梯的分类..................................................5第2章可编程控制器简介..........................................62.1PLC的结构及各部分的作用.....................................62.2PLC的工作原理...............................................72.3PLC的编程语言...............................................82.4PLC基本指令.................................................82.5梯形图设计规则..............................................11第3章三层电梯PLC控制系统设计...................................123.1电梯的控制要求..............................................123.2三层电梯主电路..............................................123.3输入输出点数分配............................................123.4PLC外围接线图...............................................133.5功能指令表概述..............................................143.6程序分析....................................................153.7三层电梯梯形图程序..........................................19结束语........................................................29参考文献.......................................................摘要电梯是高层建筑不可缺少的运输工具，用于垂直运送乘客和货物，传统的电梯控制系统主要采用继电器--接触器进行控制，其缺点是触点多，故障率高、可靠性差、维修工作量大等，而采用PLC组成的控制系统可以很好地解决上述问题。本论文通过讨论电梯控制系统的组成，阐述可编程控制器（PLC）在电梯控制中的应用，采用三菱PLC编程的程序控制方式，提出了三层电梯的PLC控制系统总体设计方案、设计过程、组成，列出了具体的主要硬件电路、电梯的控制梯形图及指令表。并给出了系统组成框图和程序流程图，在分析、处理随机信号逻辑关系的基础上，提出了PLC的编程方法，设计了一套完整的电梯控制系统方案。采用本方案实现电梯控制，能够解决继电器——接触器触点多，故障率高、可靠性差、安装调试周期长、维修工作量大、接线复杂等缺点。使电梯运行更加安全、方便、舒适。关键词：电梯、PLC、梯形图AbstractElevator,thenecessarytransportationtoolfortallbuildings,isusedfortransferringpassengersandcommoditiesvertically.Mosttraditionalelevatorcontrolsystemadoptsrelay---contactingmachineasitscentraldirector.Butthissystemhassomanydisadvantagessuchastoomanycontactingpoints,highfaultrate,heavyrepairingworkandsoon.SoifitwasreplacedbythecontrolsystemequippedwithPLC,theproblemswillbesolvedmuchmoreeasily.ThisessayexplainstheapplicationofPLC(MitsubushiPLC)onelevator，bydiscussingtheconstructionofelevatorcontrolsystem.Italsoillustratesthegeneraldesignproject,thedesignprocessandconstructionofthePLCcontrolsystemforthree-storybuildings,listingthespecificmaincircuit,trapeziacontrolchartofelevatorandrepertoires.Italsoshowstheconstructionofframechartofthesystemandprocessflowchart.ThustheprogrammingmethodofPLCisbroughtforwardonthebasisofanalyzinganddealingwiththelogicrelationshipofrandomsigns.Italsodesignedacomplicatedelevatorcontrolsystem.Iftheprojectcanbeaccepted,itcansolvetheproblemswhichcanbebroughtbyrelay,suchastoomanycontactingpoints,highfaultrate,lowreliability,longinstallationanddebuggingtime,heavyrepairingwork,complexconnectionandsoon.第1...
