【2n3n2101-d2t】
【2n3n2101-d2t】
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。
【pwm5880c86h01】media forte m56-vip-02 m56vip02 board
allen-bradley 2711-t5a15l1 panelview 550 mono/touch/controlnet/rs232-prt, dc
sunje hi-tek sbp-11 sbp11 power controller
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