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sFTR指令的作用及符號各是什么?

發布日期:2022-04-27 點擊率:1409 品牌:組態王_Kingview

    SFTR指令是左右移位寄存器指令,它進行移位方向可以切換的移位寄存器動作,其符號如圖5-93所示。

 該指令的功能是移位信號輸入繼電器 (C的位14)為ON時,Dl將向D2移動1 位,移動的方向是設定繼電器(C的位 12)所指定的方向。在最低位或最高位中  反映數據輸入繼電器(C的位13)的ON/OFF內容。溢出移位范圍的位的內容反映在進位標志(CY)中。SFTR指令的狀態標志的具體動作情況見表5-17。

SFTR指令的梯形圖如圖5-94所示。

    此程序是當復位輸入HO. 15為OFF時,在0.01為ON狀態下,移位信號輸入HO. 14為ON時,將從D200到D202向HO. 12所指定的方向移1位,在D200的最低位設置HO. 13的內容。

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