8 Replies Latest reply on Aug 31, 2017 7:59 PM by gregor

    Get previous value of TAG in PI ProcessBook


      Hello, how can I get the previous values from a TAG.


      I have a TAG that counts from 1 to 10, at the moment this TAG is with the value of 8 and I want to get the previous value to 8 {In the case it would be 7}

      Logic is the value of tag - 1.

      I am trying to query with the code below.


      Public Sub um_historico()

      'Pego as um's anteriores ao processo

      Dim srv As Server

      Dim ptval As PIPoint

      Dim vals As New PIValues, pival As PIValue


      Set srv = Servers.DefaultServer

      Set ptval = srv.PIPoints.Item("LTQ_SM_SSS_AGC_OPER_COIL_NUM")

      Set pival = ptval.Data.ArcValue("", rtAtOrBefore)

      txtHistorico1.Contents = pival.Clone


      End Sub