1 Reply Latest reply on Feb 13, 2018 8:37 PM by gmichaud-verreault

    OPC DA Interface UOM Conversion

    dheater

      Q :How do you convert a raw signal input from degrees C to degrees F at the OPC DA level so the archive receives the temperature in degrees F?

      A: Refer to the PI Interface for OPC DA 2.x manual, Scaling and Transformations section.

      Use these values in Point Builder:

       

      OutValue = [ (InValue - Dzero) / Convers ] * Span + Zero

       

      Conversion factor = 1

      Total Code = 1

      Squareroot = 0

      In Excdec, write the following: DZERO = 0

      Span= 1.8

      Zero = 32

      Typical value = 33

       

      This should result in:

      [ ( TagVal – 0 ) / 1 ] * 1.8 + 32

      or

      TagVal * 1.8 + 32

       

      NOTE: Make sure when you have “DZERO = 0” in the Excdec field,  include a space before and after the equals sign!