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TN Hist282 How to change the Interpolation type for all Real tags in the Wonderware Historian.



This article from InSource walks through a process for changing the Interpolation type for all Real Tags in the Historian.

  • Author: Joseph Hefner
  • Published: 11/21/2017
  • Applies to: Historian 10 and above


By default, the Wonderware Historian returns all Real values with the "Linear" Interpolation type. This tech note walks through the process for switching to stairstep.

Step 1)  Launch the System Management Console and navigate to the Configuration Editor \ System Configuration \ Parameters:



Step 2) Find the parameter InterpolationTypeReal and double click on it:



Step 3)  Type in a value of 0 for Stairstep Interpolation and click "Apply" and then "OK".   If you wish to switch to linear Interpolation you would enter a value of 1 here.


Step 4) Right click on the Configuration Editor in the tree and choose "Commit Pending Changes":


Step 5) Click the Commit button: