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1794-ACN15
1794-ACN15
1794-ACN15
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。
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。
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。
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