1756-EN2TSC+++1756-EN2TSC
在些輸入信號只能由常閉觸點提供,圖1a是控制電機(jī)運行的繼電路圖,SB1和SB2分別是起動按鈕和停止按鈕,如果將它們的常開觸點接到PLC的輸入端,梯形圖中觸點的類型與圖1a完全一致。如果接入PLC的是SB2的常閉觸點,按下圖1b中的SB2,其常閉觸點斷開,X1變?yōu)镺FF,它的常開觸點斷開,顯然在梯形圖中應(yīng)將X1的常開觸點與Y0的線圈串聯(lián)(見圖1c),但是這時在梯形圖中所用的X1的觸點類型與PLC外接SB2的常開觸點時剛好相反,與繼電器電路圖中的習(xí)慣也是相反的。建議盡可能用常開觸點作PLC的輸入信號。 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
公司 名稱:廈門泰尼電氣有限公司
固定 電話:0592-6809819
聯(lián) 系 人:張亮
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