描述
数控机床所用的顺序控制装置(或系统)主要有两种,一种是传统的“继电器逻辑电路”,简称RLC(RelayLogicCircuit)。另一种是“可编程序控制器”,即PLC。RLC是将继电器、接触器、按钮、开关等机电式控制器件用导线连接而成的以实现规定的顺序控制功能的电路。在实际应用中,RLC存在一些难以克服的缺点。如:只能解决开关量的简单逻辑运算,以及定时、计数等有限几种功能控制
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