1756-IB16
1756-IB16
1756-IB16

这样，用PLC实现模拟量控制是*可能的。控制的单位值可小到212分之一的测量程值，多数也是足够的。

PLC进行模拟量控制，还有A/D、D/A组合在一起的单元，并可用PID或模糊控制算法实现控制，可得到很高的控制质量。

用PLC进行模拟量控制的好处是，在进行模拟量控制的同时，开关量也可控制。这个优点是别的控制器所不具备的，或控制的实现不如PLC方便。

当然，若纯为模拟量的系统，用PLC可能在性能价格比上不如用调节器。这也是应当看到的。

3.3用于运动控制

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。

现货，现货，降降降，火火火，火火火……

现货，现货，降降降，火火火，火火火……

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