IC697PWR722RR,IC697PWR722RR,IC697PWR722RR
用三菱 FX PLC控制某化學反應生產過程
PLC接線圖
按照輸入與輸出點的分配和項目描述的控制要求,設計PLC的接線圖如圖11-4所示。如用指示燈代替泵,用24V直流電作電源。若控制實際泵應接220V交流,如圖中虛線部分。“□”表示控制泵的接觸器線圈或模擬中的指示燈。
2.3 程序設計
根據工藝要求設計出順序控制功能圖如圖11-5所示。圖中各步用狀態繼電器S表示,這里S作普通輔助繼電器使用,在進入步進程序之后,開始分別進入A、B兩罐的A液、B液注入程序。由于B罐要進行加熱,因此,比A罐要多一步。為了同時開始將A、B兩液體注入反應罐C前,關掉A罐注入泵1,人為增加一個時間定時步,已完成對S10步的復位。
當B罐加熱到60℃且T0延時到,開始進入將A、B兩種液體注入C罐進行反應的S3步。在打開泵3、4輸送A、B兩種液體的同時,攪拌器就開始攪拌,為了延續該動作到反應結束,采用SET指令。
當A罐與B罐空,而C罐滿時,注入結束。進入反應計時步S4。60s后反應結束,C罐反應液將通過泵5經過濾器輸送到D罐。
當D罐滿時,C罐也應空。D罐通過泵6排出,當D罐空時,循環以上過程。
2.4 運行并調試程序
(1)將梯形圖程序輸入到計算機。
(2)下載程序到PLC,并對程序進行調試運行。
(3)調試運行并記錄調試結果。
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