毕业设计（论文）-基于PLC的自动售货机的设计精选.docxVIP

自动售货机的设计目录摘要IAbstractII第一章绪论31.1 研究自动售货机的目的及意义31.2国内外研究现状31.3本文研究的主要内容4第二章系统总体设计52.1售货方式52.2控制要求52.3自动售货机构想面板及工作过程52.4本章小结8第三章可编程控制器PLC93.1 PLC概论93.1.1可编程控制器的定义93.1.2可编程控制器的特点93.1.3可编程控制器的发展趋势93.2 PLC控制自动售货机的主要功能103.3PLC选型103.4可编程控制器的工作原理123.5本章小结13第四章自动售货机的硬件设计144.1输入输出点分配144.2外部硬件接线图及主电路144.3货币识别原理164.4本章小结17第五章自动售货机控制系统的软件控制185.1程序设计185.2本章小结26结论27参考文献28参考文献28致谢30摘要随着科技的发展和我国人口的增长，自动售货机的重要性和必需性开始慢慢体现出来，这也使得其具有广阔的发展空间。由于PLC的特性，使PLC可以应用于各个领域。而通过与单片机等控制的对比，确定使用PLC来控制自动售货机，因此本次设计是基于PLC的饮料自动售货机，可将其安放于学校的图书馆、食堂、球场等很多地方，使同学们更加便利。本文分析了自动售货机在国内外的发展现状，利用可编程逻辑控制的目的和意义，从自动售货机的结构、分类、控制要求等对自动售货机做了简单概述，介绍了可编程控制器工作原理、发展趋势、应用领域等，对系统的控制方案进行设计。按照I/O分配表对PLC选型，并画出外部接线图。通过对售货机的功能分析作出硬件框图，根据硬件框图选择所需要的PLC、货币识别器、电动机和接触器。根据控制系统流程图编写符合自动售货机功能的程序。关键词：自动售货机，PLC，控制系统，梯形图AbstractWith the development of science and technology and the growth of Chinas population, the importance and necessity of the vending machine began to emerge, which makes it has a broad space for development. Because of the characteristics of PLC, so that PLC can be applied in various fields. And by comparing with the SCM control, to control the automatic vending machine use PLC to determine therefore, this design is the beverage vending machine based on PLC, which can be placed in the school library, dining hall, stadium and many other places, make students more convenient.This paper analyzes the development status at home and abroad of the vending machine, the purpose and significance of the use of programmable logic control, classification structure, automatic vending machine, control requirements to do a simple overview of the automatic vending machine, introduces the programmable controller working principle, development trend, application field, design of control scheme according to the I/O system. The selection of PLC allocation table, and draw the external wiring diagram. Based on the analysis of functions of the vending machine to make hardware diagram, according to the hardware diagram to select the PLC currency re