| 品牌：施耐德 | 規格：140EHC20200 | 材質：140EHC20200 |
| 產地：法國 |
140EHC20200
140EHC20200
140EHC20200
當PLC運行時，CPU就要執行用戶程序中的操作。但是CPU不可能同時執行多個操作，只能分時地一個操作一個操作地執行。PLC利用係統軟件在其內部建立了輸入輸出映像區，當PLC的CPU執行用戶程序時，從輸入映像區中讀取輸入信號的狀態，進行相應的操作。當CPU執行完第一個操作後，將操作結果輸出到輸出映像區，然後再執行第二個操作，操作結果送到輸出映像區。在程序執行過程中，PLC並不讀取輸入信號的真正狀態，執行結果也並沒有輸出到PLC外部。只有當程序執行到結束指令（END）時，將輸出映像區中執行結果向PLC外部輸出一次，將輸入信號的狀態讀取一次送到輸入映像區。對輸入輸出信號的這一操作過程稱為I/O刷新。I/O刷新完成後，CPU再從用戶程序的第一條指令開始，進行下一次程序執行。PLC的這種工作方式被稱為掃描方式。
PLC的掃描周期包括上電後初始處理、共同處理、上位鏈接服務、外設服務、運算處理、I/O刷新。
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