MDD093C-N-060-N2L-110GL0控制系統(tǒng)硬件設(shè)計(jì)
MDD093C-N-060-N2L-110GL0控制系統(tǒng)的核心是下位控制器PLC,松下FP1的控制器因其較高的性價(jià)比受到用戶的青睞。
(1) FP1具有計(jì)算機(jī)Link功能,可由上位計(jì)算機(jī)根據(jù)MEWTOCOL-COM通訊協(xié)議,直接通過編程口RS422讀取FP1中的接點(diǎn)信息和其數(shù)據(jù)寄存器中的內(nèi)容,實(shí)現(xiàn)數(shù)據(jù)采集,監(jiān)視運(yùn)行狀態(tài)的功能;同時RS232可直接與操作界面觸摸屏進(jìn)行通訊。
(2)MDD093C-N-060-N2L-110GL0 擴(kuò)展方便、靈活,可根據(jù)輸入輸出的點(diǎn)數(shù)的多少選擇主機(jī)CPU單元和擴(kuò)展單元。
(3) MDD093C-N-060-N2L-110GL0控制單元和擴(kuò)展單元輸出功能強(qiáng)大:各個“COM”端均為獨(dú)立的,可使用不同的電壓;輸出點(diǎn)額定控制能力強(qiáng),為2A/250VAC或2A/30VDC,可直接控制接觸器動作。
MDD093C-N-060-N2L-110GL0車庫設(shè)置兩個車輛出入口,主要目的是加快存取車輛的速度。系統(tǒng)配置時選用一個PLC,在東西出入口處各放置一臺觸摸屏,東出入口觸摸屏和PLC距離約為 8m,所以直接通過RS232接口通訊;兩個觸摸屏之間的距離約為20m,選用RS485通訊接口。圖3為其通訊接口協(xié)議接線圖。
由于立體停車庫領(lǐng)域的特殊性,對電機(jī)的要求很高,一般都采用三合一電機(jī)(即減速、制動、剎車為一體),本車庫使用德國漢森電機(jī),橫移電機(jī)為0.25kW,升降電機(jī)為 2.2kW,規(guī)格為三相380V,通過接觸器的通斷直接控制電機(jī)的運(yùn)行和停止,完全可以達(dá)到車位板的定位要求。
MDD093C-N-060-N2L-110GL0綜合以上因素,根據(jù)I/O點(diǎn)數(shù)、輸入輸出信號特點(diǎn)、輸出驅(qū)動能力、通訊等要求,選擇FP1系列C72C繼電器輸出型PLC,擴(kuò)展模塊為繼電器輸出型E40(I 24/O 16),即可滿足設(shè)計(jì)要求。
5 控制系統(tǒng)軟件設(shè)計(jì)
本系統(tǒng)軟件部分的中心任務(wù)是根據(jù)輸入的存(取)車密碼,對應(yīng)的車位板運(yùn)行到指定的位置。主要有四部分組成:(1)自動操作程序—根據(jù)車主輸入的密碼,對應(yīng)的車位板運(yùn)行,完成車輛的存取。(2)單步操作程序—按下按鈕,執(zhí)行一個車位板的完整動作。(3)手動操作程序—按鈕按下時,車位板運(yùn)動,直至車位板到位,否則停止,可方便維修、故障查找。(4)操作顯示程序—在存(取)車過程中,應(yīng)顯示必要的提示信息,方便車主存(取)車;為方便維護(hù)人員,在系統(tǒng)故障時,應(yīng)顯示對應(yīng)的故障代碼。
MDD093C-N-060-N2L-110GL0所有實(shí)現(xiàn)上述功能的PLC軟件程序采用步進(jìn)結(jié)構(gòu),圖4所示為軟件流程圖。
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