Defines the size of OPC Block's set of values. Please check Driver's documentation for information about the limit for this property, according to B1 to B4 parameters. By creating OPC Block Elements for the OPC Block, it allows both accessing the values read and also allows writing values to the device. Default value of this property is 0 (zero). The next script contains an example of using this property.

Sub OPCBlock1_OnStartRunning()
  Size = 12
End Sub