河南农业大学 本科生毕业论文（设计）

题 目 ：基于PLC的自动售货机设计

摘 要

在今天的工业生产中，可编程逻辑控制器（PLC）已经成为实现工业自动化的关键。本文简要介绍了有关可编程逻辑控制器的一些基础知识和简单应用，而且还介绍了PLC的技术特点，并重点在硬件、软件和组态软件方面进行了介绍，对它们在工业自动化中的典型应用、最新的技术发展趋势也作了介绍。矚慫润厲钐瘗睞枥庑赖。 自动售货机在中国有着广阔的发展前景，文中介绍了自动售货机的发展历史和现状。在这次毕业设计中，我查阅了大量资料，以PLC原理为基础设计了自动售货机系统。按照自动售货机的工作方式，把一次交易过程分为：运行初期清零过程、投币过程、价格比较过程、选择商品过程、退币过程。利用梯形图编制各个过程的程序，完成了设计的基本要求。聞創沟燴鐺險爱氇谴净。

关键词：可编程逻辑控制器；梯形图；过程；自动售货机

PLC-based design of a vending machine

1

Abstract

In today's industrial production, the programmable logic controller (PLC) has become the key to realization of industrial automation. This article briefly describes the programmable logic controller of some basic knowledge and simple applications, but also introduces the technical features of PLC and focus on hardware, software and configuration software are introduced, their typical in industrial automation applications, the latest trends in technology are also introduced.

Vending machines in China has a bright future, the paper introduces the history and development of vending machine status. During the graduation project, I reviewed a lot of information to design PLC based on the principle of automatic vending machine system. Vending machines work according to a transaction process is divided into: Run the initial clearing process, the process of coin, the price comparison process, the process of selection of goods, coin process. Ladder prepared using the procedure of each process to complete the design of the basic requirements.

残骛楼諍锩瀨濟溆塹籟。

Key Words：Programmable logic controller；ladder；process；vending machines酽锕极額閉镇桧猪訣锥。

2