摘要随着社会不断的进步，机械化程度的迅速发展，自动化控制已在人们的生活中得到了广泛的运用，给人们带来了便利。我国人口数目庞大，自动售货机在人们的生活中扮演着越来越重要的角色，从长远来看其具有广阔的发展空间。本次设计的自动售货机为饮料自动售货机，贩卖性质明确，适于放置在短时间人口流动比较大的地方，比如餐厅、车站等。分析了自动售货的结构和工作原理，阐述了自动售货机的背景和意义，以及在的发展现状，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-32MR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。根据控制要求进行I/O分配，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，如果购物后有剩余金额，则可按退币按钮退币，梯形图的编写通过GXDeveloper来完成，梯形图程序之后用三菱PLC仿真软件进行了仿真调试。关键词：自动售货机、PLC、梯形图2AbsteactAlongwiththedevelopmentofthemodemworld,mechanizationisdevelopingrapidlysuchasautomationwhichhasbeenwidelyappliedinpeople'slife,bringingaboutgreatconveniencetopeople.ThelargenumberofpeopleinChinamakesgreatcontributionstoamoreandmoreessentialrolethatvendingmachinewillplayandbroadspacefordevelopmentinthelongrun.Thevendingmachineexplicatedbelowisdesignedforsellingdrinks,whichhasaclearsellingpropertyandisespeciallysuitableforbeingplacedwherethereisalargepopulationflowinashorttime,forinstance,restaurantsandstations,etc.Therewillbeanalysesofitsorganization,workingprincipleandalsoanswerstoitsdesigningbackgroundandpracticalsignificanceaswellascurrentdevelopingconditionbelow.Moreover,thispaperdemonstratesschemeofthevendingmachineandintroducesbasiccomposition,characteristicsandworkingprincipleofPLC.MoredetailsarealsoaddedtotheoveralldesignprocessofthemachinesystemwhichisbasedonMitsubishiFX2N—32.AccordingtothecontrolrequirementofI/Odistribution,theexternalwiringdiagramisshown.Inaddition,vendingmachinefunctionprogramiswrittenbasedontheflowchartofcontrolsystem.Forexample,ifthereisremainingmoneyaftershopping,theywouldbeunderautomaticcontrolandreturntocustomers5pocketsbypeople'spressingonabutton.Whentheladderdiagramiscon^letedbyGXDeveloper,itwillbesimulatedanddebuggedwiththehelpofmitsubishiPLCsimulationsoftwareKeywords:Vendingmachine、PLC、Ladder3目录第一章绪论................................................................6L1自动售货机的背景及意义.............................................61.2研究自动售货机的目的..............................