摘  要:随着人们生活水平的日益提高，电梯成为了城市生活中必不可少的垂直交通工具。电梯的种类和功能也逐渐的增多，传统的电梯已经不能满足现今人们生活需求。人们对于电梯的要求也越来越高，不仅是在安全性、舒适性上，在电梯的效率和节能方面也有了较高的要求。

　　　传统的电梯中的继电器控制和单台电梯的运行已经不能满足人们的需求了。在本次设计中是在一台电梯的基础上，以PLC为核心，改造出双电梯的控制系统。用以解决人们在现今生活中遇到的种种困难，提高电梯的工作效率和有效的节约资源。为人们的出行提供便利。

　　　在论文中，通过对PLC的分析和比较选择出适合的PLC，选择了西门子的编程的控制方式，提出来九层双电梯的设计思路，列出了系统控制流程图、控制原则、I/O分配表及电梯的梯形图。完成了双电梯控制系统，切实的做到了节省资源和合理运用电梯。

关键词：双电梯;PLC;分层;控制

ABSTRACT:As people living standard is increasing day by day, the elevator has become the essential vertical transportation in the city life. Type and function of the elevator also gradually increase in the number of updates, and the traditional elevator cannot meet the demand of people's life today. People also more and more higher to the requirement of the elevator, not just in safety, comfort requirements, in terms of efficiency and energy saving of the elevator also have higher requirements.

　　　The traditional relay control and single elevator in the elevator running already cannot satisfy people's needs. In this design is based on an elevator, with PLC as the core, the reform of double elevator control system. To solve all kinds of difficulties in people in today's life, improve the working efficiency of the elevator and effective save resources. Provide convenience for people's travel. 

　　　In the paper, through the analysis of the PLC and comparison, choose the suitable PLC chose Siemens programming control method, put forward nine layers of double elevator design train of thought, lists the system control flow chart, control principle, the I/O allocation table and the ladder diagram of the lift. Complete the double elevator control system to do save resource and reasonable use of the elevator.

Keywords: double elevator; PLC; layered; control