PLC控制开关量的能力是很强的。所控制的入出点数，少的十几点、几十点，多的可到几百、几千，甚至几万点，由于它能联网，点数几乎不受限制，不管多少点都能控制，所控制的逻辑问题可以是多种多样的：组合的、时序的、即时的、延时的、不需计数的、需要计数的、固定顺序的、随机工作的等等，都可进行。

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