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，电梯门自动关闭后．控制系统进行下列运作：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。

    Lift the electrical system from the drive system and control system composed 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, automatic switching gate. Also in the Cabin have both inside and outside lights show the direction of the lift and a few floors. 

关键词：电梯模型（ Elevator）  PLC   程序设计（Programming model）

目  录

第1章  前言                                                   1

第2章  电梯概述                                               1

2.1电梯的起源与发展                                            1

2.2国外电梯的情况                                              2

2.3国内电梯的情况                                              3

2.4 电梯技术发展趋势                                           4

第3章  PLC的发展                                              5

3.1 PLC的定义                                                  5

3.2 PLC的发展阶段                                              6