摘要本文是介绍采用三菱FX2-40MRCD4511PLC编写数字显示电子钟,显示器采用七段LED显示器,共接入6位,从左至右分别表示秒、时、分的个、时位。采用BCD码驱动器CD4511把PLC输出的时、分、秒等显示BCD码变换成对应的显示器所要求的7段驱动信号。由于显示位数较多,故显示采用动态显示方式,PLC的输出类型为晶体管源输出(正逻辑),其中输出端子Y0~Y3输出第一组显示器的BCD信号,Y10~Y13输出第二组显示器的BCD信号,Y4~Y7依次为各组显示器的选通信号。关键词:PLC,驱动器,晶体管AbstractThisarticleisintroduced40MRCD4511PLC-writeFX2mitsubishielectricclock,thedisplayUSESdigitaldisplayof7LEDdisplay,twogroupsofeightaccess,includingthefirstgroup(above)isusedtoindicatethefourhours,points,fromlefttoright,saidthetenmonths,10daysofbitsandbytes,.UsingthePLCCD4511BCDdriveroutputmonth,day,andclassificationofconvertingBCDdisplaymonitorrequestedofsevendriversignal.Becauseofthat,itshowsmoredigitsdisplaymodebyusingdynamic,PLCoutputtypetransistorsourceoutput(for),whichislogicalY0outputterminalsoutputfirstgroupY3~Y10signalmonitorBCDY13~thesecondgroupdisplaysoutputsignal,Y4~Y7BCDingroupsofcommunication,display.Keywords:ProgrammableLogicController,Drive,Transistor前言可编程控制器(ProgrammableLogicalController)是在计算机技术、通信技术和继电器控制技术的发展基础上开发起来的,现已广泛应用于工业控制的各个领域。它以微处理器为核心,用编写的程序进行逻辑控制、定时、计数和算术运算等,并通过数字量和模拟量的输入/输出来控制机械设备或生产过程。PLC自身具有完善的功能,模块化的结构,以及开发容易、操作方便、性能稳定、可靠性高的特点和较高的性价比,使其在工业生产中的应用前景广阔,而且随着集成电路的发展和网络时代的到来,PLC必将能够有更大的用武之地。目录第1章PLC概述.................................................................................................................................11.1PLC的产生...................................................................................................................................11.2PLC的功能和特点....................................................................................................................11.3PLC的结构与工作过程..........................................................................................................41.4PLC的应用与发展....................................................................................................................7第2章PLC控制的数字显示电子钟.........................................................................................82.1设计目的........................................................................................................................................82.2设计要求........................................................................................................................................82.3电子钟的显示数值范围、PLC控制的硬件接口及软件设计................................82.4数字电路CD4511的原理(引脚及功能)....................................................................12第3章程序设计.............................................................................................................................203.1数字显示电子钟主程序........................................................................................................203.2梯形图...........................................................................................................................................233.3接线图...........