以上几点应用是着重从质上讲的。从量上讲，PLC有大、有小。所以它的控制范围也可大、可小。小的只控制一个设备，甚至一个部件，一个站点；大的可控制多台设备，一条生产线，以至于整个工厂。可以说工业控制的大小场合，都离不开PLC。
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