Overview
When any Tag is registered into a Historian module to record the value over time or events, it becomes a Historian Tag. This page will show you how to configure a new Historian Tag and the properties availableA HistorianTag represents a specific data point you want to track and store over time. The HistorianTags definition links a Tag to a HistorianTable for organized storage, supporting various data types. When you map the tag to a HistorianTable, it will record the value changes or events associated to that tag over time.
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
Understanding Historian Tags
Historian Tags are used when you need to archive data, especially when dealing with process control and manufacturing. You have the option to archive the following Historian Tag types:
- Integer
- Decimal (float)
- Text (string)
- Digital (boolean)
When you use Historian Tags, you archive data by associating information with specific tags and tablesHistorianTables in Storage Locations. In other words, you establish a link between Tags and Historian Tables HistorianTables to ensure systematic and organized data storage. You can also archive Template Tags. For this case, you can specify one of the Template Tag's properties or archive all properties by entering only the primary Tag name.
When archiving Tags created using DataTemplates, you don't need to specify all the properties.
The two 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 defines the storage location to which that variable will be connected.
Configuring HistorianTags
Before setting HistorianTags, you need to configure a HistorianTable. To Know more about creating and configuring HistorianTables, click here. You can also
To utilize Historian Tags, you need to define which Tags are associated with each Historian Table.
Configuring Historian Tags
Before setting Historian Tags, you need to configure the Historian Tables. However, you can use the default one (Table 1).
After configuring the Historian TablesHistorianTables, you can start defining which Tags to archive with archive with the configured Historian TablesHistorianTables. To add and configure a single Tag, follow the steps below:
Access Historian
→/ Historian Tags.
On the
Tag NameTagName 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 BandDeadBand, Deviation, and
Rate Of ChangeRateOfChange. The following section describes each of these configurations.
Select if the platform should consider an Absolute or Percentual as the
Deviation Dead Band TypeDeviationDeadBandType.
To finish, select the
Historian TableHistorianTable, where the Tags' information will be archived.
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Only the Tag Name and Historian Table fields are mandatory. |
The image below illustrates the process described above.
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 NameTagName | Specify the unique identifier of the Tag to be archived. To To archive Template Tags, specify one of the Template Tag's properties or archive all properties by entering only the primary Tag name. |
Dead BandDeadBand | (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 the SaveOnChange option in the Historian TableHistorianTable. |
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 TimeDeadBand option in the Historian TableHistorianTable. If you define this property, its value overrides the Time Deadband TimeDeadband logging interval. |
Rate Of ChangeRateOfChange | (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 TimeDeadBand option in the Historian TableHistorianTable. If you define this property, its value overrides the Time Deadband TimeDeadband logging interval. |
Deviation Dead Band TypeDeviationDeadBandType | (Optional feature) Determines the calculation method used to define the deadband Deadband value. |
HistorianTable | Select the Historian Table HistorianTable to use when saving the Tag's value. |
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