TRM-21006691,TRM-21006691,TRM-21006691
FX系列PLC的定時擴展編程
FX系列的定時器的最長定時時間為3 276.7s，如果需要更長的定時時間，可使用圖1所示的電路。當X2為OFF時，T0和C0處于復位狀態，它們不能工作。X2為ON時，其常開觸點接通，T0開始定時，3000s后100ms定時器T0的定時時間到，其當前值等于設定值，它的常閉觸點斷開，使它自己復位，復位后T0的當前值變為0，同時它的常閉觸點接通，使它自己的線圈重新“通電”，又開始定時。T0將這樣周而復始地工作，直到X2變為OFF，從上面的分析可知，圖1中最上面一行電路是一個脈沖信號發生器，脈沖周期等于T0的設定值。
產生的脈沖列送給C0計數，計滿30000個數（即25000h）后，C0的當前值等于設定值，它的常開觸點閉全。設T0和C0的設定值分別為KT和KC ，對于100ms定時器，總的定時時間為
T=0.1KTKc (s)
如以用特輔助繼電器M8014的觸點向計數器提供周期為1min的時鐘脈沖，單個定時器的最長定時間為32 767min。
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