The DeviceHigh property defines the highest value achieved by this Tag in a device. This property is used to perform a scale adjustment of the value received from a device before setting it to the Value property. Likewise, the inverse operation is performed before sending that value to the Driver, when writing. This conversion only occurs when the EnableScaling property is set to True. Default value of this property is 1,000. Example:

Sub Tag_OnStartRunning()
  ' Adjusts the scale of temperature
  ' ranging from 0 to 255 at PLC, but it actually means
  ' 0 to 100 Celsius degrees
  EU = "Celsius degrees"
  EnableScaling = True
  DeviceHigh = 255
  DeviceLow = 0
  EUHigh = 100
  EULow = 0
End Sub