描述
应该注意的是虽然在梯形图中已经有了软继电器的互锁触点(X1与X0、Y1与Y0),但在I/O接线图的输出电路中还必须使用KM1、KM2的常闭触点进行硬件互锁。因为PLC软继电器互锁只相差一个扫描周期,而外部硬件接触器触点的断开时间往往大于一个扫描周期,来不及响应,且触点的断开时间一般较闭合时间长。例如Y0虽然断开,可能KM1的触点还未断开,在没有外部硬件互锁的情况下,KM2的触点可能接通,引起主电路短路,因此必须采用软硬件双重互锁。采用了双重互锁,同时也避免因接触器KM1或KM2的主触点熔焊引起电动机主电路短路。
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