描述
当X0接通时，T253当前值计数数器开始累积100ms的时钟脉冲的个数。当X0经t0后断开，而T253尚未计数到设定值K345，其计数的当前值保留。当X0再次接通，T253从保留的当前值开始继续累积，经过t1时间，当前值达到K345时，定时器的触点动作。累积的时间为t0+t1=0.1×345=34.5s。当复位输入X1接通时，定时器才复位，当前值变为0，触点也跟随复位。
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