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SET/RSET指令的作用及符號各是什么?

發布日期:2022-04-27 點擊率:2040 品牌:組態王_Kingview

SET指令是置位指令。它表示指令執行條件為ON時,將指定的觸點置于ON,其符號如圖5-35所示。

       
輸入條件為ON時,將R所指定的觸點置于ON。此時無論輸入條件是OFF還是ON,指定觸點R都始終保持ON狀態;若要使R進入()FF狀態,就要使用RSET指令。

    RSET指令是復位指令。它表示指令執行條件為ON時,將指定的觸點置于OFF,進行復位操作,其符號如圖5-36所示。

    指令執行條件為ON時,將R所指定的觸點置于OFF。此時無論輸入條件是OFF還是ON,指定觸點都始終保持OFF狀態。  需要注意的是,不能通過SET/RSET指令進行定時器和計數器的置位與復位操作,但可以作為每次刷新型指令使用。

    SET/RSET指令的梯形圖如圖5-37所示。

    此程序是當0. 00為ON時,則100. 00為ON;直到0.01為ON為止,100. 01保持ON狀態。

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