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