描述
100ms积算定时器T250～T255的定时范围为0.1～3276.7s。X1的常开触点接通时(见图3–12)，T250的当前值计数器对100ms时钟脉冲进行累加计数。X1的常开触点断开或停电时停止定时，当前值保持不变。X1的常开触点再次接通或重新上电时继续定时，累计时间(t1+t2)为1055×100ms=105.5s时，T250的触点动作。因为积算定时器的线圈断电时不会复位，需要用X2的常开触点使T250强制复位。
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