注意如果在一次CPU扫描期间,带有同样参考地址的同一定时器多次出现的话，那么定时器的当前值相同。如果预设定值为零或非,那么OFDT就不传送电流。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)等于预设定值(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–参看下而的C部分。当此功能再次接收到电流时,电流值复位至0。
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