Defines whether this OPC Tag must be read or not by the OPC Driver. If this property is set to True, the OPC Driver automatically updates Value, Bits, from Bit00 to Bit31, and RawValue properties of this object in time spans. Otherwise, this OPC Tag is not read. Default value of this property is True. The next script contains an example of using this property.

Sub CommandButton1_Click()
  ' Stops a Tag reading
  Set obj = Application.GetObject("Driver1.tag")
  obj.AllowRead = False
End Sub