描述
当输入X0接通时，定时器T200从0开始对10ms时钟脉冲进行累积计数，当计数值与设定值K123相等时，定时器的常开接通Y0，经过的时间为123×0.01s=1.23s。当X0断开后定时器复位，计数值变为0，其常开触点断开，Y0也随之OFF。若外部电源断电，定时器也将复位。
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