文档介绍：目录
摘要 1
第1章电梯概述 3
引言 3
电梯的发展简史 3
电梯的基本结构 3
电梯的分类 5
第2章可编程控制器简介 6
PLC的结构及各部分的作用 6
PLC的工作原理 7
PLC的编程语言 8
PLC基本指令 8
梯形图设计规则 11
第3章三层电梯PLC控制系统设计 12
电梯的控制要求 12
三层电梯主电路 12
输入输出点数分配 12
PLC外围接线图 13
功能指令表概述 14
程序分析 15
三层电梯梯形图程序 19
三层电梯助记符语句程序 21
本系统的不足及改进 27
结束语 29
致谢 30
参考文献 31
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
Abstract
Elevator, the necessary transportation tool for tall buildings, is used for transferring passengers modities vertically. Most traditional elevator control system adopts relay--- contacting machine as its central director. But this system has so many disadvantages such as too many contacting points, high fault rate, heavy repairing work and so on. So if it was replaced by the control system equipped with PLC, the problems will be solved much more easily.
This essay explains the application of PLC (Mitsubushi PLC) on elevator,by discussing the construction of elevator control system. It also illustrates the general design project, the design process and construction of the PLC control system for three-story buildings, listing the specific main circuit, trapezia control chart of elevator and repertoires. It also shows the construction of frame chart of the system and process flow chart. Thus the programming method of PLC is brought forward on the basis of analyzing and dealing with the logic relationship of random signs. It also designed plicated elevator control system. If the project can be accepted, it can solve the problems which can be brought by relay, such as too many contacting points, high fault rate, low r