描述
优先(互锁)电路电路是指两个输入信号中先到信号取得优先权,后者无效。例如在抢答器程序设计中的抢答优先,又如防止控制的电机两个正、反转按钮同时按下的保护电路。图6-17所示为优先电路例。图中,X0先接通,M10线圈接通,则Y0线圈有输出;同时由于M10的动断触点断开,X1输入再接通时,亦无法使M11动作,Y1无输出。若X1先接通,情况相反。
但该电路存在一个问题:一旦X0或X1输入后,M10或M11被自锁和互锁的作用,使M10或M11永远接通。因此,该电路一般要在输出线圈前串联一个用于解锁的动断触点。
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