第I页毕业设计（论文）专用纸摘要本文阐述了自动售货机的设计概论、研究意义以及它的发展历史，对自动售货机的方案进行了论证。本设计采用西门子s7-200系列PLC作为控制系统，介绍了PLC的基本组成、发展以及特点。文中详尽地介绍了自动售货机的原理以及各硬件组成，PLC外部接线图，并与按钮指示灯相结合进行人机交互，以完成交易。本设计编程部分采用了西门子专用编译软件进PLC梯形图的编写。基于西门子s7-200系列PLC控制的自动售货机具有很高的稳定性，保证自动售货机能够长期运行。关键词：PLC，自动售货机，梯形图第II页第I页毕业设计（论文）专用纸AbstractThispaperexpoundstheintroductiontothedesignofthevendingmachine,theresearchsignificanceandthedevelopmenthistoryofit,anddemonstratestheschemeofit.ThisdesignschemeadoptstheSiemenss7-200seriesPLCasthecontrolsystem,andintroducesthebasicstructure,developmentandcharacteristicsofthePLC.ThispaperintroducestheprincipleofthevendingmachineandthehardwarecompositionandPLCexternalwiringdiagram,andcombinedwithbuttonsandindicatorlightsforhumaninteractioninordertocompletethetransaction.ThisdesignprogrammingpartadoptsSiemenscompilersoftwareintothewritingofthePLCladderdiagram.TheSiemensPLCcontrol-basedvendingmachinehashighstabilitytoensurethevendingmachinecanrunforalongtime.Keywords:PLC,vendingmachine,ladderdiagram第III页第II页毕业设计（论文）专用纸目录1绪论...........................................................................................................................11.1课题研究背景、目的以及意义......................................................................11.2自动售货机的历史沿革与发展前景..............................................................11.3本设计的基本要求..........................................................................................31.4自动售货机设计的基本思路..........................................................................32PLC概述.....................................................................................................................52.1PLC的产生以及定义.......................................................................................52.2PLC发展趋势...................................................................................................62.3PLC的硬件组成与工作原理...........................................................................82.4PLC的编程语言...............................................................................................93自动售货机的整体设计..........................................................................................103.1自动售货机控制面板图................................................................................103.2电机的选择....................................................................................................113.4钱币识别器....................................................................................................123.5电磁阀的选择................................................................................................164控制系统设计..........................................................................................................174.1控制电路硬件组成框图................................................................................174.2工作流程图....................................................................................................174.3自动售货机I/O点分配...............................................
