这个东西没啥用的,没有说明,IO读写都没有,只能读写V区,而且函数都没有参数,郁闷
Private Declare Function writeVB Lib "S7_200_PPI.dll" () As Long
Private Declare Function writeVBx Lib "S7_200_PPI.dll" () As Long
Private Declare Function writeVW Lib "S7_200_PPI.dll" () As Long
Private Declare Function writeVW
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