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內部的100ms、10ms、1ms時鐘脈沖進行累加計數，當前值等于設定值時，定時器的常開觸點接通，常閉觸點斷開。當定時條件變為OFF，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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