品牌:施耐德 | 規格:140CRP93200 | 材質:140CRP93200 |
產地:法國 |
140CRP93200
140CRP93200
140CRP93200
PLC的基本工作方式是順序執行用戶程序,每一時鐘周期執行一條指令。對用戶程序的執行一般有循環掃描和定時掃描兩種,掃描過程分為三個階段,即輸入採樣階段、程序執行階段和輸出刷新階段,如圖1所示。
(1)輸入採樣階段。PLC在輸入採樣階段以掃描方式順序讀人所有輸入端子的狀態,存人輸人寄存器,接著轉入程序執行階段。
(2)程序執行階段。PLC在程序執行階段中順序對每條指令進行掃描。先從輸人寄存器讀人所有輸入端子的狀態。
(3)輸出刷新階段。所有指令執行完畢後,將輸出寄存器中所有的輸出狀態送到輸出電路,成為PLC的實際輸出。
PLC執行完上述的三個階段稱為一個掃描周期。
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