This topic only applies to points and accumulators for which historic data is, or has been, exported to Wonderware Historian or AVEVA Insight (formerly Wonderware Online).
Associated with: All points and accumulators in ClearSCADA with Historic data enabled.
Security permission: Configure.
Use the Wonderware Historian Export attribute to find out the Wonderware Historian tag name for the selected ClearSCADA point or accumulator. There is one Wonderware Historian Export attribute for each Wonderware Historian database item that is configured to export the point's or accumulator's historic data. This is because the tag names could be different for each Wonderware Historian item. This could occur if:
- You move or rename the point or accumulator between creating each Wonderware Historian item
- The Wonderware Historian items have different Tag Names settings (see Specify the Properties that are Associated with Tag Names).
The attribute is only displayed for a point or accumulator that is configured to have its historic data exported using a Wonderware Historian database item. Initially, ClearSCADA will show '<No Tag>' for the tag name until it exports the first historic data for the selected point or accumulator. You can therefore use this attribute as an indication of whether or not ClearSCADA has exported any data for the selected point or accumulator.
If you delete a Wonderware Historian database item, then ClearSCADA will delete the relevant attribute from all points and accumulators.
A user can rename or move a point or accumulator in ClearSCADA after HCAL creates the Wonderware Historian tag for it. In this situation, the tag name will not match the ClearSCADA database item's current name unless you use the RenameTag method to realign the two names.
Each Wonderware Historian Export attribute shows the following information on two lines:
- The first line shows the name of the ClearSCADA Wonderware Historian export database item to which this attribute refers
- The second line shows the name of the tag created by HCAL for the selected ClearSCADA point or accumulator. This tag name is associated with the Wonderware Historian shown in the first line. The name has the following format:
[<prefix>.]<object name>[.<aggregate name>]
(where
[<prefix>.]and[.<aggregate name>]are optional)
There is a blank line between each export entry.
Further Information
Information and examples of how the tag name content differs, depending whether the Prefix and Aggregate Name Suffix are used: see Wonderware Historian Tags.
Specify to which external historian application(s) a point's or accumulator's historic data is to be exported: see Define the Historic Export Details.