描述

為了防止運(yùn)行時(shí)由于壓力變送器不可預(yù)見(jiàn)的故障造成PLC的PID運(yùn)算調(diào)節(jié)失實(shí)，從而造成管網(wǎng)壓力失恒引發(fā)失壓或爆管的嚴(yán)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(shí)測(cè)到出廠輸水管線上的壓力；在PLC程序上對(duì)壓力信號(hào)進(jìn)行了相應(yīng)的處理，在程序中設(shè)置選擇軟開(kāi)關(guān)，調(diào)度人員可以在RSView上將其中一臺(tái)壓力變送器的值設(shè)定為“控制反饋值”，另一臺(tái)壓力變送器的值則設(shè)為“參考反饋值”（見(jiàn)圖2：變頻恒壓供水系統(tǒng)控制圖形界面（RSView工作站））；對(duì)1#壓力和2#壓力值進(jìn)行比較，相差0.1Mpa時(shí)，判斷為，其中一只壓力變送器出現(xiàn)故障，變頻器控制轉(zhuǎn)換為遠(yuǎn)程直接手動(dòng)調(diào)頻控制（通過(guò)RSView設(shè)置運(yùn)行）。壓力變送器正常工作時(shí)，“控制反饋值”經(jīng)過(guò)平均濾波處理后，分別比較壓力報(bào)警上限和下限值，如果超出控制范圍，變頻器控制轉(zhuǎn)換為遠(yuǎn)程直接手動(dòng)調(diào)頻控制，否則“控制反饋值”作為PID調(diào)節(jié)的參數(shù)PV。

同時(shí)為了在就地手動(dòng)控制實(shí)現(xiàn)在控制現(xiàn)場(chǎng)對(duì)變頻泵進(jìn)行開(kāi)?？刂坪瓦\(yùn)行數(shù)據(jù)監(jiān)視。我們?cè)谧冾l泵工作現(xiàn)場(chǎng)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(jìn)行通信，進(jìn)行數(shù)據(jù)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(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應(yīng)用于以下領(lǐng)域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)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(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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