基于 PLC 的自动售货机控制设计摘要:本论文设计的是基于三菱FX2N系列PLC构成的自动售货机监控系统, 本文阐述了自动售货机的来源与进展, 以及它在国内外进展的现状, 对自动售货机的方案进行了论证, 介绍了PLC的基本组成、 特点以及工作原理, 对基于三菱FX2N系列PLC构成的自动售货机系统整体设计过程进行较为细致的论述。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, 文中采纳的是三菱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, 然后以一次交易过程为例, 把交易过程分为几个程序块, 然后分别对程序块进行编程。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。关键词: 自动售货机; 顺序功能图; 梯形图; I/O点的分配。The Control Design Of Vending Machine Based On PLCAbstract:This thesis is based on Mitsubishi PLC FX2N series monitoring system consisting of vending machines, vending machines this paper describes the origin and development, and its development status at home and abroad, on the vending machine programs were demonstrated, PLC introduces the basic composition, characteristics and working principle, based on Mitsubishi FX2N series PLC vending machine system as a whole constitutes the design process in a more detailed discussion.The paper describes in detail the various hardware components of vending machines, and completed a PLC external wiring diagram. PLC ladder in the preparation, the paper uses a special compiler software Mitsubishi PLC ladder to be written. Introduces the basic principles of vending machines and work processes, and then to a transaction process, for example, the transaction process is divided into several blocks, and then program the block respectively. Specify the programmable logic controller's role in the vending machines. P...
