BMXXBC008K施耐德
PLC採用集中採樣、集中輸出、循環掃描的工作方式。
特點:集中採樣是指在一個掃描周期內,PLC對輸入狀態的採樣只在輸入採樣階段進行,當進入程序執行階段後輸入端將被封鎖。
集中輸出是指在一個掃描周期內,PLC只在輸出刷新階段才將輸出映像寄存器中與輸出有關的狀態轉存到輸出鎖存器中,對輸出接口進行刷新,在其他階段輸出狀態一直保存在輸出映像寄存器中。
循環掃描是指PLC在一個掃描周期內需要執行多個操作,它採用分時掃描的方式按順序逐個執行,周而復始重復運行。
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