描述
步進(jìn)梯形指令是專門為順序控制設(shè)計(jì)提供的指令,它的步只能用狀態(tài)寄存器S來(lái)表示,狀態(tài)寄存器有斷電保持功能,在編制順序控制程序時(shí)應(yīng)與步進(jìn)指令一起使用,而且狀態(tài)寄存器必須用置位指令SET置位,這樣才具有控制功能,狀態(tài)寄存器S才能提供STL觸點(diǎn),否則狀態(tài)寄存器S與一般的中間繼電器M相同。在步進(jìn)梯形圖中不同的步進(jìn)段允許有雙重輸出,即允許有重號(hào)的負(fù)載輸出,在步進(jìn)觸點(diǎn)結(jié)束時(shí)要用RET指令使后面的程序返回原母線。把圖1中的0-3用狀態(tài)寄存器S600-S603代替,代替以后使用步進(jìn)梯形指令編程,對(duì)應(yīng)的梯形圖如圖3所示。這種編程方法很容易被初學(xué)者接受和掌握,對(duì)于有經(jīng)驗(yàn)的工程師,也會(huì)提高設(shè)計(jì)效率,程序的調(diào)試、修改和閱讀也很容易,使用方便,程序也較短,在順序控制設(shè)計(jì)中應(yīng)優(yōu)先考慮,該法在工業(yè)自動(dòng)化控制中應(yīng)用較多。
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