Differences between the Trend Client control and the Historian Client Trend control

If you use the Historian Client Trend control, you need to be aware that there are several differences between the Trend Client Control and the Historian Client Trend control.

Description of the Historian Client Trend control

AVEVA Historian Client Trend is a client application that allows you to query tags from a Historian database and plot them on a graphical display. The Historian Client Trend supports two different chart types: a regular trend curve and an XY scatter plot.

Before you can use the Historian Client Trend control to query tag information from the database, the Historian Server must be running and you must have the necessary access privileges.

Description of the Trend Client control

In contrast to the Historian Client Trend control, the Trend Client control:

• Includes the real-time as well as historical trending functionality.

• Uses the data from a historical source such as InTouch Log History (LGH) files or from the Historian.

• Has fewer pens.

• Uses real-time attribute or tag data as well as historized data stored in the Historian or InTouch Log History (LGH) files.

• Does not require a separate license from the Application Server.

• Requires the InTouch HMI.

• Only supports the full and cyclic retrieval modes of the Historian when retrieving data.

• Does not support configuring the default pen colors (although you can change them after you add a pen).

• Does not provide scatter plots and target regions.