基于PLC的自动售货机控制毕业设计（论文）.doc

摘 要 自动售货机最早出现在二十世纪五、六十年代的西欧，当时在美国的地铁系统中，人们可以用1美分在自动售货机上买到一块口香糖。目前自动售货机在一些国家已达到普及的程度。自动售货机有自动售饮料机、自动售香烟机和自动服务机等等。 PLC控制自动售货机，选择合适的方案，并进行合理的硬件选型、设计及I/O配置，将程序输入PC机进行调试，最终确定设计方案。 文中详尽地介绍了自动售货机的各硬件组成，并完成了PLC外部接线图。在PLC梯形图的编写时，文中采用的是三菱PLC梯形图专用编译软件来进行编写。介绍了自动售货机的基本原理以及工作流程具体说明了可编程序控制器在自动售货机中的作用。程序涉及到了自动售货机工作的绝大部分过程。利用PLC控制的自动售货机提高了系统的稳定性，保证自动售货机能够长期稳定运行PLC，FX2N Abstract Vending machine appears the earliest in the 1950s and 1960s, when the Western Europe in the subway system in the United States, people can use 1 cents in vending machine to buy a piece of chewing gum. At present the vending machine in some countries has reached popularity of degree. Vending machines, automatic machines, automatic sale sell cigarette machine and automatic service machine, etc. This paper studied the vending machine, report the development of the situation, application field and the future trend of development of the vending machine ,Using PLC control vending machine, choose the right plan and make reasonable hardware selection, design and the I/O configuration, debugging input PC, determines the design scheme. This paper introduced in detail the vending machines, hardware composition, and completed PLC external hookup. Write in PLC ladder diagram, the paper USES is when mitsubishi PLC ladder-diagram special compiled software to write. Introduces the basic principle of vending machine and the working process, specifying the programmable controller in the vending machine in the role. Program involves a vending machine work most of the process. Use of PLC controlled vending machines, improve the stability of the system, ensure the vending machine can have a long-term and stable operation. Keywords: vending machine,PLC,FX2N 目录 摘 要 1 Abstract 2 绪论 5 第1章 自动售货机简介 6 1.1自动售货机的起源和发展 6 1.2 自动售货机的发展现状和发展前景 7 第2章 可编程控制器PLC简介 9 2.1 PLC概述 9 2.1.1可编程控制器的产生和发展 9 2.1.2 PLC的发展前景和主要品牌 10 2.2 PLC的工作原理 11 2.2.1 PLC的硬件组成 11 2.2.2 PLC的工作原理 12 2.2.3 PLC应用的特点及编程语言 14 第3章 硬币验钞机构及原理 15 3.1硬币验钞机构 15 3.2硬币的识别原理 15 第4章