PLC（可编程序控制器）是近几十年来发展起来的一种新型工业控制器，由于它编程灵活，功能，应用广泛比继电器系统的控制简单，使用方便，抗干扰力强，性价比高，工作寿命高，而其本身具有体积小，重量轻，耗电省等特点。继电器系统有明显的缺点：体积大，可靠性低，工作寿命短，查找故障困难，特别是由于它是靠硬连线逻辑构成系统，所以接线复杂，对于生产工艺的变化的适应性差，不便实现集中控制；而PLC的安装和现场接线简便，可以应用其内部的软继电器简化继电器系统的繁杂中间环节，实现软接线逻辑构成系统，方便集中控制，除此之外，PLC还具有自诊断、故障报警、故障报警种类显示及网络通讯功能，便于操作和维修人员检查。
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