PLC三层楼电梯系统设计与调试

设计要求
 三层电梯分别用1F、2F和3F表示1层、2层和3层。电梯必须具有如下功能：
 （1）电梯停于1F或2F时，按3F按钮呼叫，电梯上升到3F才停止，由行程开关SQ3停止。
 （2）电梯停于2F或3F时，按1F按钮呼叫，电梯下降到1F才停止，由形成开关SQ1停止。
 （3）电梯停于1F时，按2F按钮呼叫，电梯上升到2F停止，由形成开关SQ2停止。
 （4）电梯停于3F时，按2F按钮呼叫，电梯下降到2F停止，由SQ2停止。
 （5）电梯停于1F，2F和3F均有按钮呼叫，电梯先上升到2F，由SQ2控制暂停2S，然后上升到3F停止，由SQ3停止。
 （6）电梯停于3F，2F和1F均有按钮呼叫，电梯先下降到2F，由SQ2控制暂停2S，然后下降到1F停止，由SQ1停止。
 （7）电梯上升途中或下降途中，任何反方向按钮呼叫均无效；
 （8）每层楼之间到达时间应在12S内完成，否则电梯停机；

摘要：
PLC（可编程控制器）作为一种工业控制微型计算机，它以其编程方便、操作简单尤其是它的高可控性等优点，在工业生产过程中得到了广泛的应用。它应用大规模集成电路，微型机技术和通讯技术的发展成果，逐步形成了具有多种优点和微型，中型，大型，超大型等各种规格的系列产品，应用于从继电器控制系统到监控计算机之间的许多控制领域。随着社会的不断发展，楼房越来越高，而电梯成为了高层楼房的必须设备。电梯从手柄开关操纵电梯、按钮控制电梯发展到了现在的群控电梯，为高层运输做出了不可磨灭的贡献。PLC在电梯升降控制上的应用主要体现在它的逻辑开关控制功能。由于PLC具有逻辑运算，计数和定时以及数据输入输出的功能。在电梯升降过程中，各种逻辑开关控制与PLC很好的结合，很好的实现了对的控制。
本文主要讨论研究利用欧姆龙CPM1A PLC对电梯的升降进行控制，形成电梯控制系统。

关键词：PLC   电梯控制   欧姆龙   升降

ABSTRACT：
PLC (programmable controller) takes one industrial control microcomputer, it is convenient by its programming, simplicity of operator its merits and so on high controllability, obtained the widespread application particularly in the industrial production process. It applies the large scale integrated circuit, the miniature machine technology and the mechanics of communication development achievement, formed gradually had many kinds of merits and miniature, medium, large-scale, the ultra-large type and so on each kind of specification's serial products, applied to monitors between computer's many control domain from the black-white control system. Along with society's unceasing development, the building is getting higher and higher, but the elevator became the high-level building to the equipment. The elevator from the handle switch operation elevator, the push-button control elevator develops to present's group control elevator, has made the indelible contribution for the high-level transportation. PLC mainly manifests in the elevator cuing control's application in its logical switch control function. Because PLC has the logic operation, counting and fixed time as well as data feeds output function. In the elevator rises and falls in the process, each logical switch control and the PLC very good union, very good have realized to the fluctuation the control.
This article main discussion studies uses Simens in the S7-200 PLC to carry on the control to elevator's fluctuation, forms the lift control system.

key words:  Programmable Logic Controller    Lift control    Ohm of dragon     Fluctuation