Overview
When any Tag is registered into a Historian module to record the value over time or events, it is called HistorianTag.
The HistorianTag can be any of this types: INT, Digital, Decimal or TextA 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.
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Understanding Historian Tags
Historian Tags allow users to archive data effectively. To add a tag, users enter the TagName and select a Historian table. This interface offers flexibility with optional settings and supports the use of template tags for storing specific properties or all properties associated with a main tag name.
Definition
Historian Tags is a tool that facilitates the archiving of data by associating it with specific tags and tables.
Purpose
The purpose of Historian Tags is to facility the store data.
Function
Historian Tags function by linking tags to a table into the ArchiveLocation.
Operation
Users operate Historian Tags by entering a tag name and choosing a Historian table for archiving. For template tags, users either select a specific property or store all properties by entering the main tag name.
Application
Historian Tags apply in scenarios where data collection, archiving, and retrieval are necessary. They are crucial in fields like process control, manufacturing, and other industrial applications where historical data analysis is essential.
Usage
To use Historian Tags, go to Historian → Historian Tags, enter the tag name, select a Historian table, and configure additional settings if needed. For template tags, users specify whether to store specific properties or all associated properties.
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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 HistorianTables to ensure systematic and organized data storage.
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 use the default one (Table 1).
After configuring the HistorianTables, you can start defining which Tags to archive with the configured HistorianTables. To add and configure a single Tag, follow the steps below:
Access Historian / Historian Tags.
On the TagName 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 DeadBand, Deviation, and RateOfChange. The following section describes each of these configurations.
Select if the platform should consider an Absolute or Percentual as the DeviationDeadBandType.
To finish, select the HistorianTable, where the Tags' information will be archived.
The image below illustrates the process described above.
HistorianTags Properties
When configuring a HistorianTag, 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 |
|---|---|
TagName | 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. |
DeadBand | (Optional feature) Defines |
Configuring Historian Tags
After configuring the HistorianTables, or just keeping the predefined ones, the next step is to list the tags to be archived in connection with those HistorianTables.
Go to Historian → Historian Tags.
Type or select tags in the TagName column, or copy and paste tags from Unified Namespace → Tags.
Configure any required additional fields.
Only the TagName and TableName fields are mandatory.
Historian Tags properties
Historian Tags Properties | |
ID | Uniquely identifies a record in a database. |
VersionID | Tracks different versions of a record as it changes. |
TagName | Gives a descriptive name to a data point for reference. |
DeadBand | Range of values that triggers no update or alarm. |
Deviation | Measures difference from an expected value. |
RateOfChange | Shows how quickly a value changes. |
DeviationDeadBandLimit | Sets a specific limit for deviations. |
DeviationDeadBandType | Determines the calculation method for the dead band. |
HistorianTable | Records historical data points. |
LockState | Indicates whether someone has locked a record from changes. |
LockOwner | Shows who has the editing lock. |
DateCreated | Indicates when someone created the record. |
DateModified | Indicates when someone last modified the record. |
| Property | Description |
|---|---|
TagName | Enter a tag name or click ... to select a tag. |
DeadBand | When using the Save on Change option in the historian table, the DeadBand is how much the value must change (in Units) for the system to store the value. This configuration is considered when you use the SaveOnChange option in the historianHistorianTable. |
Deviation | When using the Time DeadBand option in the historian table, the Deviation is (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 TimeDeadBand option in the historian. This HistorianTable. If you define this property, its value overrides the Time Deadband TimeDeadband logging interval. |
RateOfChange | When using the Time DeadBand option in the historian table, the RateOfChange is (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 TimeDeadBand option in the historian. This HistorianTable. If you define this property, its value overrides the Time Deadband TimeDeadband logging interval. |
DeviationDeadBandType | (Optional feature) Determines the calculation method used to define the Deadband value. |
HistorianTable | Select the table that has the settings you want HistorianTable to use for when to save and how long to retain this tag's value. |
[Other columns] | For definitions of other columns that are available in many tables, see Common Column Definitions. |
Adding Tags for Data Logging
After you configure your tables for the tag historian, you can configure the tags that will be logged.
To configure the tags for the tag historian:
- Chose a previously created tag to store.
- Go to Historian > Historian Tags.
- Fill the TagName field with the previously chosen name.
- Fill in the HistorianTable field with the previously chosen table.
- If necessary, configure more settings, but in general cases it is not necessary.
when saving the Tag's value. |
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