本科毕业论文---基于plc的自动售货机控制系统设计正文.doc

PAGE\*MERGEFORMAT43第页随着科技的不断发展，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，并将有更好的发展。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，确定采用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。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，完成梯形图后可以在三菱PLC仿真软件GXSimulator6c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；MCGSABSTRACTWiththedevelopmentofscienceandtechnology,theapplicationofPLCinengineeringeverybodybeobvioustopeople,PLChasoccupiedaspaceforonepersonineveryfield,andwillhaveabetterdevelopment.Becauseofthelargenumberofpopulation,thevendingmachineisplayingamoreandmoreimportantroleinpeople'slife,inthelongrunithasbroadspacefordevelopment.Thedesignoftheautomaticvendingmachineforbeveragevendingmachine,thenatureofthegoodssoldintheclear,adaptedtobeplacedinashorttimepopulationflowofrelativelylargeareas,suchasrestaurant.First,bycomparingwiththesinglechipmicrocomputerandhydrauliccontrol,andadoptPLCtocontrolthevendingmachine,thenanalyzesthestructureandworkingprincipleofautomaticvendingmachinessellingprocess,understandthevendingmachine,topreparefortheselectionofhardware.Throughvendingmachinefunctionanalysistomakethehardwareblockdiagram,accordingtothehardwareblockdiagram,selectthedesiredPLCcurrencyrecognizer,motorandcontactor.AccordingtotheI/OdistributionlistonthePLCselection,anddrawtheexternalwiringdiagram.Accordingtotheflowchartofcontrolsystempreparedwithvendingmachineprogram.Iftheshoppingaftertheremainingamount,thenpressthecoinbuttoncoin.TrapezoidalchartcompilationdonebyGXDeveloper,completeladderdiagramcanbedebuggedandsimulatedinMitsubishiPLCsimulationsoftwareGXSimulator6c.Finally,MCGSmadetheconfigurationeffect.Configurationsimulationdiagramofthevendingmachinecomprisesabutton,indicatorlight,theslot,fetchingport,acoinrefundpart.Keywords:vendingmachine;PLC;ladderdiagram;MCGS目录TOC\o"1-