When upgrading from version 1.1 to 2.x, converted displays containing charts may update at a slower rate than they did in version 1.1. You may also see the error message "Memory Low: Unable to Plot Data". In infoAgent 1.1, the Maximum Points setting (used when configuring the Historian data source for charts) was an artificial way to limit the amount of Historian data sent across the network. Because using the Max Points setting can cause trend distortion, it has been removed in version 2.x. It is extremely important that you examine the amount of data your charts are set up to retrieve. If they are retrieving too much data, this may give an initial impression that 2.x performs slower than 1.1. However, you have full control over how much data is retrieved, and experimenting with the following settings will ensure the best possible performance:
Use an alternative retrieval mode (Retrieve Mode on the General tab of the Historian Edit Source dialog box).
Time range parameters (Time tab of the Historian Edit Source dialog box). For more information on retrieval modes and time intervals, see iHistorian Data Sources.
Pen settings on the chart's configuration dialog box (e.g., limiting the number of pens).
Additionally, you can limit the data by
setting the Max query tag in the config.xml file associated with
the data source. The config.xml file can be found in the
datasources directory (InstallDir\GE Fanuc\Proficy
datasources\Historian). Locate the particular Historian data source config.xml file. Open the file in a text editor such as Notepad, and change the value of the MAXQUERY tag. The default value is 100000. If the data request exceeds this amount, you will receive an error message.