BUS_ RD功能块从VME总线上读取数据。这个功能应该在程序中需要该数据之前执行。如果要被读取的数据总数在32767字节、字或双字以上,则使用多指令来读取该数据。当BUS_ RD接收到能量流,它就访问在指定机架(R)、插槽(S)、子插槽(SS)、区域地址(RGN)和偏移量(OFF)上的VME模块。BUS_ RD从输出点Q开始在模块中复制的数据:单位(双字、字或字节)指定数量送入CPU。该功能块的操作成功时,向右传递能流。功能块执行的状态在状态位置(ST)中反映出来。
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