BUS_ RD功能塊從VME總線上讀取數(shù)據(jù)。這個功能應(yīng)該在程序中需要該數(shù)據(jù)之前執(zhí)行。如果要被讀取的數(shù)據(jù)總數(shù)在32767字節(jié)、字或雙字以上，則使用多指令來讀取該數(shù)據(jù)。當(dāng)BUS_ RD接收到能量流，它就訪問在指定機架(R)、插槽(S)、子插槽(SS)、區(qū)域地址(RGN)和偏移量(OFF)上的VME模塊。BUS_ RD從輸出點Q開始在模塊中復(fù)制的數(shù)據(jù):單位(雙字、字或字節(jié))指定數(shù)量送入CPU。該功能塊的操作成功時，向右傳遞能流。功能塊執(zhí)行的狀態(tài)在狀態(tài)位置(ST)中反映出來。

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