E51-DF3;
E51-DF3現貨;
E51-DF3供應。
輸入回路的設計
1、電源回路 PLC供電電源一般為 AC85—240V(也有DC24V),適應電源范圍較寬,但為了抗干擾,應加裝電源凈化元件(如電源濾波器、1:1隔離變壓器等)。
2、PLC上DC24V電源的使用各公司 PLC產品上一般都有DC24V電源,但該電源容量小,為幾十毫安至幾百毫安,用其帶負載時要注意容量,同時作好防短路措施(因為該電源的過載或短路都將影響PLC的運行)。
3、外部DC24V電源 若輸入回路有 DC24V供電的接近開關、光電開關等,而PLC上DC24V電源容量不夠時,要從外部提供DC24V電源;但該電源的“—”端不要與 PLC的 DC24V的“—”端以及“COM”端相連,否則會影響PLC的運行。
4、輸入的靈敏度各廠家對PLC的輸人端電壓和電流都有規定,如日本三菱公司F7n系列PLC的輸入值為:DC24V、7mA,啟動電流為4.5mA,關 斷電流小于1.5mA,因此,當輸入回路串有二極管或電阻(不能完全啟動),或者有并聯電阻或有漏電流時(不能完全切斷),就會有誤動作,靈敏度下降,對 此應采取措施。另一方面,當輸入器件的輸入電流大于PLC的輸入電流時,也會引起誤動作,應采用弱電流的輸入器件,并且選用輸人為共漏型輸入的 PLC,Bp輸入元件的公共點電位相對為負,電流是流出 PLC的輸入端。
17、人人好公,則天下太平;人人營私,則天下大亂?!獎Ⅸ?br />
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