Overview
A Historian Tag HistorianTag represents a specific data point you want to track and store over time. The Historian Tags link HistorianTags definition links a Tag to a Historian Table HistorianTable for organized storage, supporting various data types. When you map the tag to a Historian TableHistorianTable, it will record the value changes or events associated tag over time.
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Understanding HistorianTags
When a solution Tag, or an external Asset, is mapped to be archived or retrieved from an Historian, that configuration is called a HistorianTag.
When you define HistorianTags, you archive data by associating information with specific tags and HistorianTables in Storage locations. In other words, you establish a link between Tags and Historian Tables to ensure systematic and organized data storage.
When Archiving Tags created using DataTemplates, you don/t need to specify all the properties, jut the initial tagname.
The 2 pieces of Information that are mandatory to define an Historian Tags are:
TagName: variables that will archived, or retrieved.
HistorianTable: logical object that groups data and define in which Storage Location that variable will be connected.
Configuring Historian TagsHistorianTags
Before setting Historian Tags, you need to configure the Historian Tables. However, you can use the default one (Table 1).
After configuring the Historian Tables, you can start defining which Tags to archive with the configured Historian Tables. To add and configure a single Tag, follow the steps below:
Access Historian / Historian Tags.
On the Tag Name column, type the Tag name or select from the available list. Alternatively, copy and paste the Tag's name from Unified Namespace / Tags.
Configure the Dead Band, Deviation, and Rate Of Change. The following section describes each of these configurations.
Select if the platform should consider an Absolute or Percentual as the Deviation Dead Band Type.
To finish, select the Historian Table, where the Tags' information will be archived.
The image below illustrates the process described above.
Historian Tags HistorianTags properties
When configuring a Historian TagHistorianTag, you need to specify some properties that will define how data will be archived. The following table describes each available property you can configure:
| Property | Description |
|---|---|
Tag Name | Specify the unique identifier of the Tag to be archived. To archive Template Tags, specify one of the Template Tag's properties or archive all properties by entering only the primary Tag name. |
Dead Band | (Optional feature) Defines how much the value must change (in Units) for the system to store the value. This configuration is considered when you use the Save on Change option in the Historian Table. |
Deviation | (Optional feature) Specify how much the value must change (in Units) for the system to store the value. This configuration is considered when you use the Time DeadBand option in the Historian Table. If you define this property, its value overrides the Time Deadband logging interval. |
Rate Of Change | (Optional feature) Defines how much the value must change (in Units) by second for the system to store the value. This configuration is considered when you use the Time DeadBand option in the Historian Table. If you define this property, its value overrides the Time Deadband logging interval. |
Deviation Dead Band Type | (Optional feature) Determines the calculation method used to define the deadband value. |
HistorianTable | Select the Historian Table to use when saving the Tag's value. |
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