1738-IB4M12控制器1738-IB4M12控制器1738-IB4M12控制器PLC点阵键盘在工控行业中，有时候会碰到因为可编程控制器（PLC）输入点的不够，而导致需要更换设备，浪费资源。对此，当实时性不需要那么高时，我们可以编写一个键盘的扫描程序来扩展输入的点数。因为扫描的方式是循环扫描，所以在实时性方面会有一定的欠缺。下面是用海为PLC编程软件编写的8乘6的48键扫描程序。需要用到8个输入点，6个输出点，硬件连接如下图所示：注：当要求实现组合按键时上图的二极管必须加，反之二极管可加可不加。扫描的点是令Y0~Y5循环输出，当有按钮按下时，就会做出相应的动作，例如：当按钮键0按下时，则X0接通，当程序扫描到Y0时，X0与Y0形成一个回路，表示按键“0”按下。程序如下图所示：结论：键盘是以循环扫描的方式来进行输入，而扫描的时间越短则实时性越好。但是当扫描时间过短时会因Y0~Y5输出结束时，X0仍未接通导致无法产生输出信号。或者当Y0输出结束，Y1也输出结束时，X0仍未断开，导致误判断。经过型号SW-S32ZS220T测试可知每次循环扫描的时间T0不得低于20ms。建议可将滤波时间设得短一点，则可以缩短每次循环扫描的时间T0，例如：本例中将滤波时间设为0.8ms，则每次循环扫描的时间T0可以设到***短10ms。SIEMENS6FX1-120-2CA01USPP6FX11202CA01ASEABROWNBOVERIYB161101-GKUSPPYB161101GKOnePanasonicACServoDriverMSDA083D1A750WFreeShipSIEMENS6FC5-203-0AB12​-0AA0USPP6FC52030AB120A​A0PANASONICNACHIACSERVOMOTORMFMMFM552Q3V5.5KWTEXASINSTRUMENTSPLC961642USPP961642TexasInstruments46191PCBoardITESIEMENSCED63B015LNSFPCED63B015LTEXASINSTRUMENTS500-2151-APOWERSUPPLY5002151ABAILEYCONTROLS6637827B1NSPP6637827B1PanasonicServoMSD023A1XX&MotorM***022A1F200WPanasonicACServoMotorM***022A1EnewinboxfreeshipTEXASINSTRUMENTSPLC500-5016USPP5005016ASEABROWNBOVERIR512H6B1N4NN1NNSPPR512H6B1N4NN1NASEABROWNBOVERI57310001-GPUSPP57310001GPFOXBORO230***-AUSPP230***A560-2820TITexasInstrumentsPowerSupply5602820TexasInstruments2460221-0001ASEABROWNBOVERIAF260-20-22-72NSFPAF260202272ARO39566013NSPP39566013TEXASINSTRUMENTSPLC530-1104NSFP5301104MOOG152D-423AUSPP152D423ATEXASINSTRUMENTSPLC505-6108USPP5056108M***A042A1GPanasonicACServoMotorFreeShipTEXASINSTRUMENTSPLC545-1102USPP5451102ASEABROWNBOVERIE-32235USPPE32235(AS01)MSD043A1XPANASONICACSERVODRIVEUSEDWORKINGASEABROWNBOVERI3BSE005831R1NSPP3BSE005831R1PanasonicServoMotorM***042P1A400WFreeShipTEXASINSTRUMENTSPLC505-4316NSPP5054316TexasInstruments2497284PCBDPM550CMU-7KMODICONP2-984A-816USPPP2984A816BAILEYCONTROLS6637827B1NSPP6637827B1ASEABROWNBOVERIDSQC-239USPPDSQC239GEFANUCIC646NMP000NSFPIC646NMP000PanasonicACServoMotorM***152A2D200V9.4AWEINIG1LA5131-2FB90-​ZX51USPP1LA51312FB90ZX​51PANASONICMSDA043A1AMINAS-AACSERVODRIVER400WNIBNEWPanasonicACServoDriveMQDB011AAD03new0190-19214TexasInstrumentsPM550-400LoopAccessModulePM550400ASEABROWNBOVERI3ASD573001A1USPP3ASD573001A1PanasonicACServoDriveMCDCT3312B12Lotof2PanasonicACServoMotorM***A041A1EASEABROWNBOVERIE-32235USPPE32235TEXASINSTRUMENTSPLC510NSFP510TexasInstruments500-5020GENERALELECTRICCK08CE311JNSFPCK08CE311JTEXASINSTRUMENTSPLC505-4016ANSFP5054016AHOFFMANC-SD302410SSNSPPCSD302410SSTEXASINSTRUMENTSPLC505-CP1434TFNSPP505CP1434TFSIEMENS6ES5-923-3UA11NSFP6ES59233UA11TEXASINSTRUMENTSPLC500-5055USPP5005055TexasInstruments7MT210PanasonicACServoDriverMSD013A1XX07FreeShipTEXASINSTRUMENTSPLC305-LICUSPP305LICTEXASINSTRUMENTSPLCPM550-5040USPPPM5505040Perceptron140-0138ReplacementLaserModuleALLENBRADLEY512-CJB-6P-24RNSPP512CJB6P24RTexasInstruments5TI-2000OMRONF10-S15RUSPPF10S15RTEXASINSTRUMENTSPLC945075-0001-VUSPP9450750001VTEXASINSTRUMENTSPLC2490871USPP2490871TEXASINSTRUMENTS500-5061OUTPUTMODULE5005061)