用戶程序通過編程器順序輸入到用戶存儲器，CPU對用戶程序循環掃描并順序執行，這是PLC的基本工作過程。

     當PLC運行時，用戶程序中有眾多的操作需要去執行，但是CPU是不能同時去執行多個操作的，它只能按分時操作原理，每一時刻執行一個操作。但由于CPU運算處理速度很高，使得外部出現的結果從宏觀來看似乎是同時完成的。這種分時操作的過程，稱為CPU對程序的掃描（CPU處理執行每條指令的平均時間：小型PLC如OMRON-P系列為10μs、中型PLC如FANUC-PLC-B為7μs）。

     PLC接通電源并開始運行后，立即開始進行自診斷，自診斷時間的長短隨用戶程序的長短而變化。自診斷通過后，CPU就對用戶程序進行掃

◆ 企業名稱：廈門泰尼電氣有限公司

◆ 企業性質： 有限責任公司

◆ 主營業務：DCS,PLC

◆ 經營模式： 貿易

◆ 貿易地區： 全國

◆ ： 小廖女士）

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◆ 郵政編碼： 361026

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