ABB SAFT 110

ABB SAFT 110

ABB SAFT 110

設(shè)智力測(cè)驗(yàn)時(shí)分四個(gè)組，每一組前面放一個(gè)按鈕，當(dāng)某一組先按下按鈕時(shí)，其對(duì)應(yīng)的指示燈亮，電鈴響，此時(shí)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(quán)”。這就是“四路智力搶答器”的“搶答”功能。

設(shè)計(jì)“四路智力搶答器”的關(guān)鍵是：四路信號(hào)優(yōu)先擇一，拒絕其余。

如果用邏輯門來(lái)實(shí)現(xiàn)的話，可以用五個(gè)四輸入與非門和一級(jí)輸出驅(qū)動(dòng)電路來(lái)實(shí)現(xiàn)。但在這里僅介紹用PLC“程序”來(lái)實(shí)現(xiàn)“四路智力搶答器”邏輯功能的方法：

1、將如下程序語(yǔ)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(gè)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(nèi)部已接電源負(fù)極，COM1為輸出繼電器分區(qū)的公共端，應(yīng)接24V直流電源的正極。千萬(wàn)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(xiǎn)絲。因本實(shí)驗(yàn)臺(tái)本身沒有提供電鈴，所以電鈴在圖中未畫出，實(shí)際應(yīng)用時(shí)可用相應(yīng)的輸出接繼電器再控制電鈴。

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