詳細介紹
ABB SAFT 110
ABB SAFT 110
ABB SAFT 110
設智力測驗時分四個組,每一組前面放一個按鈕,當某一組先按下按鈕時,其對應的指示燈亮,電鈴響,此時其它按鈕均失效。這樣,先按下按鈕的那一組,就搶到了“答題權”。這就是“四路智力搶答器”的“搶答”功能。
設計“四路智力搶答器”的關鍵是:四路信號優(yōu)先擇一,拒絕其余。
如果用邏輯門來實現(xiàn)的話,可以用五個四輸入與非門和一級輸出驅動電路來實現(xiàn)。但在這里僅介紹用PLC“程序”來實現(xiàn)“四路智力搶答器”邏輯功能的方法:
1、將如下程序語句寫入PLC中:“0 LD X0 1 ANI Y1 2 ANI Y2 3 ANI Y3 4 OUT Y0 5 LD X1 6 ANI Y0 7 ANI Y2 8 ANI Y3 9 OUT Y1 10 LD X2 11 ANI Y0 12 ANI Y1 13 ANI Y3 14 OUT Y2 15 LD X3 16 ANI Y0 17 ANI Y1 18 ANI Y2 19 OUT Y3 20 END”
2、按照I/O分配接線圖接線。I/O分配接線圖如圖3所示,圖中P0—P3為四個按鈕,X0—X3為輸入繼電器接口,Y0—Y3為輸出繼電器接口,COM為輸入繼電器的公共端,在內部已接電源負極,COM1為輸出繼電器分區(qū)的公共端,應接24V直流電源的正極。千萬注意不能將COM和COM1連接在一起,否則,將造成電源短路,燒壞保險絲。因本實驗臺本身沒有提供電鈴,所以電鈴在圖中未畫出,實際應用時可用相應的輸出接繼電器再控制電鈴。
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