Resolving flat line in long duration Wonderware Historian Client Trends

Description

This article from InSource walks through resolving the problem where long duration Wonderware Historian Client trends show a flat line after a certain amount of time.

• Author: Joseph Hefner
• Published: 3/17/2016
• Applies to: Historian Client 10 or later

Details

In this scenario, you will most likely see a trend that looks similar to the one below:

First, from within the Historian Client trend go to Tools \ Options from the menu bar:

In the scenario described above, the most likely problem is the "Query row limit". In the picture below you can see where this value has been set to 200.

To resolve this issue set the value to 0 as in the picture below and click the OK button.