品牌:ABB | 規格:AX522A | 材質:AX522A |
產地:瑞士 |
AX522A
AX522A
AX522A
中央處理單元(CPU)是PLC 的控制中樞。它按照PLC係統程序賦予的功能,接受並存儲從編程器鍵入的用戶程序和數據,檢查電源、存儲器、I/O以及警戒定時器的狀態,並能檢查用戶程序的語法錯誤。當PLC投入運行時,首先它以掃描的方式接受現場各輸入裝置的狀態和數據,並分別存入I/O映象區, 然後從用戶程序存儲器中逐條讀取用戶程序,經過命令解釋後按指令的規定執行邏輯或算術運算等任務。並將邏輯或算術運算等結果送入I/O映象區或數據寄存器內。等所有的用戶程序執行完畢以後,後將I/O映象區的各輸出狀態或輸出寄存器內的數據傳送到相應的輸出裝置,如此循環運行,直到停止運行為止。
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