FX系列PLC通用定時器的工作原理如下:
當(dāng)定時條件為ON,指定的定時器對PLC內(nèi)部的100ms,、10ms,、1ms時鐘脈沖進(jìn)行累加計(jì)數(shù),當(dāng)前值等于設(shè)定值時,,定時器的常開觸點(diǎn)接通,,常閉觸點(diǎn)斷開。當(dāng)定時條件變?yōu)镺FF,,定時器被復(fù)位,,常開觸點(diǎn)斷開,常閉觸點(diǎn)接通,,當(dāng)前值恢復(fù)為零,。
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