描述

為了防止運行時由于壓力變送器不可預見的故障造成PLC的PID運算調節(jié)失實，從而造成管網壓力失恒引發(fā)失壓或爆管的嚴重事故。我們分別在1#和2#變頻泵后輸水管上安裝壓力變送器，可以同時測到出廠輸水管線上的壓力；在PLC程序上對壓力信號進行了相應的處理，在程序中設置選擇軟開關，調度人員可以在RSView上將其中一臺壓力變送器的值設定為“控制反饋值”，另一臺壓力變送器的值則設為“參考反饋值”（見圖2：變頻恒壓供水系統控制圖形界面（RSView工作站））；對1#壓力和2#壓力值進行比較，相差0.1Mpa時，判斷為，其中一只壓力變送器出現故障，變頻器控制轉換為遠程直接手動調頻控制（通過RSView設置運行）。壓力變送器正常工作時，“控制反饋值”經過平均濾波處理后，分別比較壓力報警上限和下限值，如果超出控制范圍，變頻器控制轉換為遠程直接手動調頻控制，否則“控制反饋值”作為PID調節(jié)的參數PV。

同時為了在就地手動控制實現在控制現場對變頻泵進行開?？刂坪瓦\行數據監(jiān)視。我們在變頻泵工作現場安裝了A-B公司的PanelView圖形工作終端，該工作終端提供圖形交互界面和觸摸輸入方式，以從站的方式與PLC進行通信，進行數據和控制命令的交換，提供就地監(jiān)控操作的通道。
歐美品牌停產的，常用的“PLC”備品備件

我司產品應用于以下領域：

1,《發(fā)電廠DCS監(jiān)控系統》

2,《智能平鋼化爐系統制造》

3,《PLC可編程輸送控制系統》

4,《DCS集散控制系統》
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5,《智能型消防供水控制系統》

6,《化工廠藥液恒流量計算機控制系統》

7,《電氣控制系統》造紙,印染生產線,變電站綜合自動化控制系列

本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統配件，機器人系統配件，大型伺服系統備件。

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