每次调用功能模块使逻辑置于OFF时，当前值即被刷新，以反映由于定时器关 闭的逝去时间。当当前值(CV)等于预设定置（PV）时，此功能就停止向右传 送电流。当这现象出现时，定时器就停止累积时间，当此功能再次接收电流 时，电流值复位至0。 当 OFDT 用于一个不是每次扫描都调用的程序块时，定时器可累加程序块的 调用时间，直到定时器复位为止。
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