TBUAAVFN1N25D

TBUAAVFN1N25D

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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，*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。故它也*可以用于数字量控制。 
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（如环形分配器、功放、步进电机），则*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*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。 
3.4用于数据采集 
随着PLC技术的发展，其数据存储区越来越大。如德维森公司的PLC，其数据存储区（DM区）可达到9999个字。这样庞大的数据存储区，可以存储大量数据。 
数据采集可以用计数器，累计记录采集到的脉冲数，并定时地转存到DM区中往。 
数据采集也可用A/D单元，当模拟量转换成数字量后，再定时地转存到DM区中往。 
PLC还可配置上小型打印机，定期把DM区的数据打出来。 
PLC也可与计算机通讯，由计算机把DM区的数据读出，并由计算机再对这些数据作处理。这时，PLC即成为计算机的数据终端。 
电力用户曾使用PLC，用以实时记录用户用电情况，以实现不同用电时间、不同计价的收费办法，鼓励用户在用电低谷时多用电，达到公道用电与节约用电的目的。 
3.5用于信号监控 
PLC自检信号很多，内部器件也很多，多数使用者未充分发挥其作用。 
实在，*可利用它进行PLC自身工作的监控，或对控制对象进行监控。 
这里介绍一种用PLC定时器作看门狗，对控制对象工作情况进行监控的思路。 
如用PLC控制某运动部件动作，看施加控制后动作进行了没有，可用看门狗办法实现监控。具体作法是在施加控制的同时，令看门狗定时器计时。如在规定的时间内动作完成，即定时器未超过警戒值的情况下，已收到动作完成信号，则说明控制对象工作正常，无需报警。 
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