描述

控制系統(tǒng)軟件設(shè)計(jì)

控制系統(tǒng)的主要功能是對(duì)熱泵進(jìn)行自動(dòng)啟停，顯示溫度、壓力、流量等運(yùn)行參數(shù)，顯示壓縮機(jī)的工作狀態(tài)，記錄設(shè)備的運(yùn)行時(shí)間和故障原因，實(shí)現(xiàn)對(duì)水源熱泵中央空調(diào)系統(tǒng)的智能控制。從控制系統(tǒng)的主要功能出發(fā)，為了增加程序可讀性和減少程序代碼，PLC程序采用了主程序調(diào)用功能塊、功能塊調(diào)用函數(shù)的程序結(jié)構(gòu)。PLC程序由1個(gè)主程序、11個(gè)功能塊子程序和1個(gè)函數(shù)組成，其調(diào)用關(guān)系如圖2所示。程序編譯碼占用空間為30K。

程序設(shè)計(jì)的思路是，當(dāng)PLC上電后，一直進(jìn)行溫度、壓力、流量等運(yùn)行參數(shù)的檢測(cè)，這些檢測(cè)主要在檢測(cè)程序、故障程序和A/B組故障停機(jī)程序中完成。如果相關(guān)參數(shù)均無(wú)異常，則開機(jī)功能塊子程序運(yùn)行，啟動(dòng)壓縮機(jī)。在開機(jī)過(guò)程中，同時(shí)進(jìn)行溫度判斷。如果溫度達(dá)到了設(shè)定值，則進(jìn)入調(diào)節(jié)功能塊子程序，停止開機(jī)功能塊子程序，完成開機(jī)。根據(jù)溫度的變化，調(diào)節(jié)功能塊程序控制壓縮機(jī)的啟停。變頻器的控制則是通過(guò)調(diào)用加載程序和降載程序來(lái)實(shí)現(xiàn)。

在這些程序中，為了滿足壓縮機(jī)的使用要求，調(diào)節(jié)功能塊子程序<是最繁瑣的，例如壓縮機(jī)的啟動(dòng)時(shí)間要小于30秒、壓縮機(jī)每小時(shí)的啟動(dòng)次數(shù)不要超過(guò)5次等。為了平衡壓縮機(jī)的運(yùn)行時(shí)間，增加空調(diào)的使用壽命，傳統(tǒng)的程序設(shè)計(jì)采用先啟先停、先停先啟、開機(jī)過(guò)程中啟動(dòng)次序輪換等控制方法，來(lái)協(xié)調(diào)壓縮機(jī)的運(yùn)行時(shí)間。但是，如果本系統(tǒng)采用這種方法，則仍然存在某一臺(tái)壓縮機(jī)運(yùn)行時(shí)間過(guò)長(zhǎng)的問(wèn)題。因此決定對(duì)傳統(tǒng)方法進(jìn)行改進(jìn)，采用隨機(jī)啟停的控制方法代替先啟先停、先停先啟的控制方法，解決了壓縮機(jī)的運(yùn)行時(shí)間不平衡的問(wèn)題。

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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