G2R-2-SN-AC220V
G2R-2-SN-AC220V
G2R-2-SN-AC220V
G2R-2-SN-AC220V
G2R-2-SN-AC220V
2)適當?shù)姆蛛x繼電器電路圖中的某些電路。設(shè)計繼電器電路圖時的一個基本原則是盡量減少圖中使用的觸點這意味著成本的節(jié)約,但是這往往會使某些線圈的控制電路交織在一起。在設(shè)計梯形圖時首要的問題是設(shè)計的思路要清楚,設(shè)計出的梯形圖容易閱讀和理解,并不是特別在意是否多用幾個觸點,因為這不會增加硬件的成本,只是在輸人程序時需要多花一點時間。
《聯(lián)系人;歐先生》
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(3)盡量減少plc的輸人和輸出點。plc的價格與點數(shù)有關(guān),因此輸人、輸出信號的點數(shù)是降低硬件費用的主要措施。
(4)時間繼電器的處理時間繼電器除了有延時動作的觸點外,還有在線圈通電瞬間接通的瞬動觸點。在梯形圖中,可以在定時器的線圈兩端并聯(lián)存儲器位的線圈,它的觸點相當于定時器的瞬動觸點。
(5)設(shè)置中間單元,在梯形圖中,若多個線圈都受某一觸點串并聯(lián)電路的控制。為了簡化電路,在梯形圖中可以設(shè)置中間單元,即用該電路來控制某存儲位,在各線圈的控制電路中使用其常開觸點。
(6)設(shè)立外部互鎖電路,由于軟件動作時間原因,即使在梯形圖已經(jīng)完成互鎖,為確保不同時動作,還要在plc外部設(shè)置硬件聯(lián)鎖電路。
(7)外部負載的額定電壓,plc雙向晶閘管輸出模塊一般只能驅(qū)動額定電壓ac220v的負載,系統(tǒng)交流接觸器應(yīng)換成220v電壓的線圈。
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