【872c-a2n12-a5】
【872c-a2n12-a5】
　　实际的物理量，除了开关量、模拟量，还有运动控制。如机床部件的位移，常以数字量表示。运动控制，有效的办法是nc，即数字控制技术。这是50年代诞生于美国的基于计算机的控制技术。当今已很普及，并也很完善。目前，先进国家的金属切削机床，数控化的比率已超过40%～80%，有的甚至更高。plc也是基于计算机的技术，并日益完善。plc可接收计数脉冲，频率可高达几k到几十k赫兹，可用多种方式接收这脉冲，还可多路接收。有的plc还有脉冲输出功能，脉冲频率也可达几十k，有了这两种功能，加上plc有数据处理及运算能力，若再配备相应的传感器(如旋转编码器)或脉冲伺服装置，则完全可以依nc的原理实现种种控制。高、中档的plc，还开发有nc单元，或运动单元，可实现点位控制。运动单元还可实现曲线插补，可控制曲线运动。所以，若plc配置了这种单元，则完全可以用nc的办法，进行数字量的控制。新开发的运动单元，甚至还发行了nc技术的编程语言，为更好地用plc进行数字控制提供了方便。
【5.03.09d10bh】omron gt1-id32ml digital unit input module 24vdc
keyence ex-v02
canon bh8-2445-02 board
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