Description
定时器的设定值比正常情况下该动作的持续时间长20%左右。例如设某执行机构(如电动机)在正常情况下运行50s后,它驱动的部件使限位开关动作,发出动作结束信号。若该执行机构的动作时间超过60s(即对应定时器的设定时间)
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