基于PLC的自动售货机控制系统设计

摘要随着科技的不断进展,PLC 在工程中的应用大家有目共睹,PLC 在各个领域已占得一席之地，并将有更好的进展.我国人口数量庞大，自动售货机在人们的生活中扮演越来越重要的角色,从长远来看其具有宽阔的进展空间.本次设计的自动售货机为饮料自动售货机，贩卖的商品性质明确,适于放置在短时间人口流动比较大的地方，比如餐厅。首先通过与单片机和液压等控制的对比,确定采纳 PLC 来控制自动售货机，然后分析自动售货机的结构和工作原理，明白自动售货机的贩卖过程，以便为硬件的选择做准备.通过自动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 I/O 分配表对 PLC 选型,并画出外部接线图。根据控制系统流程图编写符合自动售货机功能的程序。假如购物后有剩余金额 ,则可按退币按钮退币。梯形图的编写通过 GX Developer 来完成,完成梯形图后可以在三菱 PLC仿真软件 GX Simulator 6c 进行调试和仿真。最后用 MCGS 作出组态效果.组态仿真图中自动售货机包括按钮、指示灯、投币口、取物口、退币口等部分.关键词：自动售货机； PLC; 梯形图； MCGSABSTRACTWith 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 people’s 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....