PLC的硬件结构是可变的，软件程序是可编的，用于控制时，非常灵活。必要时可编写多套或多组程序，依需要调用。它很适应于工业现场多工况、多状态变换的需要。用PLC进行开关量控制实例是很多的，冶金、机械、轻工、化工、纺织等等，几乎所有工业行业都需要用到它。目前，PLC首用的目标，也是别的控制器无法与其比拟的，就是它能方便并可靠地用于开关量的控制。
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