毕业设计基于PLC的自动售货机控制系统的研究与设计.doc

摘要 关键词： ABSTRACT With the development of science and technology, the application of PLC in engineering everybody be obvious to people, PLC has occupied a space for one person in every field, and will have a better development. Because of the large number of population, the vending machine is playing a more and more important role in peoples life, in the long run it has broad space for development. The design of the automatic vending machine for beverage vending machine, the nature of the goods sold in the clear, adapted to be placed in a short time population flow of relatively large areas, such as restaurant. First, by comparing with the single chip microcomputer and hydraulic control, and adopt PLC to control the vending machine, then analyzes the structure and working principle of automatic vending machines selling process, understand the vending machine, to prepare for the selection of hardware. Through vending machine function analysis to make the hardware block diagram, according to the hardware block diagram, select the desired PLC currency recognizer, motor and contactor. According to the I/O distribution list on the PLC selection, and draw the external wiring diagram. According to the flow chart of control system prepared with vending machine program. If the shopping after the remaining amount, then press the coin button coin. Trapezoidal chart compilation done by GX Developer, complete ladder diagram can be debugged and simulated in Mitsubishi PLC simulation software GX Simulator 6c. Finally, MCGS made the configuration effect. Configuration simulation diagram of the vending machine comprises a button, indicator light, the slot, fetching port, a coin refund part. Keywords: vending machine; PLC; ladder diagram; MCGS 目 录 第一章 绪论 5 1.1 自动售货机的研究背景及意义 5 1.2研究自动售货机的目的 第二章 可编程控制器PLC的介绍........................................7 2.1 可编程控制器PLC................................................................ 7 2.1.1 PLC概述 7 2.1.2 PLC的发展前景 7 2.1.3 PLC的工作原理 7 2.1.4