描述
就地控制單元不僅具有自動控制功能, 由于觸摸屏的使用,而具有直觀畫面監(jiān)視功能,其結(jié)構(gòu)如圖二所示。
如圖所示,單格濾池由五個(gè)閥門組成: DF進(jìn)水電磁閥、F1出水閥、F2水沖閥、F3氣沖閥、F4排水閥。由一臺FX2N PLC控制單格濾池的自動過濾和自動反沖洗。濾池就地控制單元即CClink 網(wǎng)絡(luò)的一個(gè)從站,執(zhí)行三格濾池的控制過程內(nèi)部數(shù)據(jù)交換。三格濾池通過RS485網(wǎng)絡(luò)互連,這種RS485網(wǎng)絡(luò)速率為192KB、距離為50米、數(shù)據(jù)傳送量不大,但也是N`:N網(wǎng)絡(luò),可實(shí)現(xiàn)主控PC與從站PC之間數(shù)據(jù)循環(huán)傳送。通過此網(wǎng)絡(luò)三格濾格的三臺FX2N PLC與觸摸屏互連。
濾池就地控制單元功能包括:
① 控制單格濾池的自動過濾和自動反沖洗。自動過濾監(jiān)測濾池水位,據(jù)濾池水位的情況及時(shí)調(diào)整出水閥的開度,使濾池保持在過濾水位。當(dāng)運(yùn)行周期到或強(qiáng)沖或水頭損失以達(dá)到時(shí),濾池進(jìn)行自動反沖洗??刂破鞅O(jiān)測濾池水位到達(dá)低水位,開啟排水閥,開啟氣沖閥、氣沖5分鐘,關(guān)閉氣沖閥;開啟水沖閥、水沖5分鐘、關(guān)閉水沖閥;關(guān)閉排水閥,沖洗結(jié)束。
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