描述
动作控制,根据动作完成的情况实施控制;
时间控制,根据时间推进的进程实施控制;
计数控制,根据累计计数的情况实施控制;
混合控制,包含有以上几种控制的组合;
还有不同以上的其它控制,等等。
使用PLC实现顺序控制是PLC的初衷,也是它的强项。在顺序控制领域,至今还没有别的控制器能够取代它。
2.用于过程控制
过程控制要用到模拟量。模拟量一般是指连续变化的量,如电流、电压、温度、压力等物理量。过程控制的目的就是,根据有关模拟量的当前与历史的输入状况,产生所要求的开关量、或模拟量输出,以使系统工作参数能按一定要求工作。是连续生产过程常用的控制。
过程控制的类型很多。
PLC用于过程控制,已是一个趋势。因为用PLC实现这个控制,其价格比用别的要低,而且,用它时,在进行模拟量控制的同时,还可很方便的进行其它控制。再加上各种过程控制模块的开发与应用,以及相关软件的推出及使用,用PLC进行种种过程控制已变得很容易,其编程也很简便。所以,目前有的厂家PLC用于模拟量控制的份额,已超过用于顺序控制。
3.用于运动控制
运动控制主要指,对工作对象的位置、速度及加速度所作的控制。可以是单坐标,即控制对象作直线运动;也可是多坐标的,控制对象的平面、立体,以至于角度变换等运动。有时,还可控制多个对象,而这些对象间的运动可能还要有协调。
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