基于PLC的四层电梯的毕业论文.docx

基于PLC的四层电梯的毕业论文
目录
摘要 1
1 前言 2
2 电梯概述 3
3
3
3
电梯技术发展趋势 3
第3章  PLC的发展 3
PLC的定义 3
PLC的发展阶段 7
PLC发展趋势 3
PLC的基本组成 3
第4章  电梯模型PLC控制系统设计 3
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PLC控制系统的设计分析 错误!未定义书签。
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PLC的选择 错误!未定义书签。
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结束语 错误!未定义书签。
致    谢 3
参考文献 3
摘要
随着我国经济的高速发展,微电子技术、计算机技术和自动控制技术也得到了迅速发展,交流变频调速技术已经进入一个崭新的时代,其应用越来越广。而电梯作为现代高层建筑的垂直交通工具,与人们的生活紧密相关,随着人们对其要求的提高,电梯得到了快速发展,其拖动技术已经发展到了调频调压调速,其逻辑控制也由PLC代替原来的继电器控制。电梯的电气系统由拖动系统和控制系统两部分组成。目前电梯设计使用可编程控制器(PLC),功能变化灵活,编程简单,故障少,噪音低。维修保养方便,节能省工,抗干扰能力强,控制箱占地面积少。当乘员进入电梯,按下楼层按钮,:根据轿厢所处位置及乘员所处层数。判定轿厢运行方向,保证轿厢平层时减速。将轿厢停在选定的楼层上;同时,根据楼层的呼叫,顺路停车,自动开关门。另外在轿厢内外均要有信号灯显示电梯运行方向及楼层数。
Abstract
With the development of the economy, microelectronic technology, computer technology and the automatic theory are developed rapidly, the AC variable frequency technology has been in a new state. Its application is ing more and more widely. But the elevator as an important traffic in skyscraper,it also has developed quickly with the improving requirement of the people .Its dragging technology has developed from DC timing to AC variable frequency timing and its logic control- relay control also has been replaced by PLC. Lift the electrical system from the drive system and control posed of two parts. Lift the current design PLC (PLC), function in a flexible, simple programming, less failure, low noise. Facilitate maintenance, energy-saving in public, anti-interference capability and control box covers an area of less. When the crew entered the elevator, press the floor button, automatically shut down after the elevator door. Control systems following the operation: Cabin crew and the location in which layers. Cars determine the direction of travel to ensure that Car-layer slowdown. Car will be parked in the selected on the floor at the same time, under floors of the calls, parking places, a