最初，PLC主要用于开关量的逻辑控制。随着PLC技术的进步，它的应用领域不断扩大。

如今，PLC不仅用于开关量控制，还用于模拟量及数字量的控制，可采集与存储数据，还可对控制系统进行监控；还可联网、通讯，实现大范围、跨地域的控制与管理。PLC已日益成为工业控制装置家族中一个重要的角色。。

3.1用于开关量控制

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。

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