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S7-200PLC在薄钢板自动剪切控制系统中的应用摘要针对普通剪切机或传统自动剪切机存在的不足，为满足中小企业对普通剪切机进行技术改造和升级的需求，提出一种基于可编程逻辑控制器S7-200PLC的薄钢板自动剪切控制系统方案并实现。当系统传送薄钢板过来时，采用光电编码器检测系统对钢板的尺寸自动计数，当与设定值（要求用拨码盘设定）一致时启动冲压系统对薄钢板进行剪切，如果大于设定值时,电机反转,直至与设定值一致。本课题的设计关键是薄钢板的剪切精度控制。本设计内容主要包括系统总体设计，系统硬件设计，系统软件设计，具体介绍了薄钢板自动剪切控制系统结构组成，确定相关电路参数，选择器件型号，给出系统的硬件连线图，软件流程图和程序清单。本设计的薄钢板剪切自动控制系统，剪切精度较高，提高了生产效率，安装方便，具有一定的应用和经济价值。关键词：S7-200PLC；自动剪切；光电编码器；变频调速S7-200PLCINTHEAUTOMATICSHEETCUTTINGCONTROLSYSTEMABSTRACTAccordingtotheinsufficientofordinaryshearmachineorconventionalautomaticcuttingmachine,inodertomeettheSMEs'technologicaltransformationandupgradeneedsofordinaryshearingmachine,thedesignshowsaprojectofautomaticcontrolsystemforthinsteelplateshear,andtomakeitwork.Whenittransmittingoverthethinplate,thesystemadoptsphotoelectricalencoderdetectionsystemtoautomaticlycountsteelsize.Ifsteelcountingsize(requiredwithadialdiscset)andsettingsizearethesame,systemstartsstampingsystemtocuttheplate,andifmorethanthesetvalue,themotorreversal,untilconsistentwithsetup.Thekeyisthedesignofprecisioncontrolofthinsteelplateshear.Thisdesignmainlyincludessystemdesign,hardwaredesign,systemsoftwaredesign,describesdetailsofstructureforthinplateautomaticcuttingsystem,identifysthecircuitparameters,andchoosedevicetype,givesthesystemhardwareandsoftwareflowchartandevenprogramminglist.Thedesignofautomaticcontrolsystemofcuttingthinplate,improvestheprecisionofshearing,improvestheproductionefficiency,offersconvenientinstallation,hascertainapplicationandeconomicvalue.Keywords:S7-200PLC；automaticshear;photoelectricencoder；frequency目录1绪论........................................................................................................................................11.1课题背景和目的意义.................................................................................................11.2设计的现状和发展趋势.............................................................................................11.3方案论证.....................................................................................................................21.4课题设计内容.............................................................................................................31.5本章小结.....................................................................................................................32系统总体设计........................................................................................................................42.1系统控制要求.............................................................................................................42.2系统结构组成和工作原理.........................................................................................42.3本章小结.....................................................................................................................53系统硬件设计........................................................................................................................63.1光电编码器.................................................................................................................63.1.1光电编码器原理..............................................................................................63.1.2脉冲信号处理..................................................................................................63.1.3光电编码器选择和安装..................................................................................73.2拨码盘应用.................................................................................................................83.2.1拨码盘原理......................................................................................................83.2.2拨码盘与PLC连接.........................................................................................93.3检测开关安装...........................................................................................................103.3.1光电开关........................................................................................................103.3.2行程开关........................................................................................................113.4主电路设计...............................................................................................................123.5变频器.......................................................................................................................133.5.1变频器一般架构............................................................................................133.5.2变频器选择....................................................................................................143.6PLC控制系统............................................................................................................153.6.1PLC选型.........................................................................................................153.6.2PLC端口分配.................................................................................................163.7脉冲当量选择...........................................................................................................173.8分段变频调速...................................................