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 Text.
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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.
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.
Properties Reference
In addition to the standard attributes of a tag, a HistorianTag has new characteristics, defined by the properties described in the following table.
Historian Tags properties
Historian Tags propertiesProperties | |
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 in the historian. |
Deviation | When using the Time DeadBand option in the historian table, the Deviation is how much the value must change (in Units) for the system to store the value in the historian. This value overrides the Time Deadband logging interval. |
RateOfChange | When using the Time DeadBand option in the historian table, the RateOfChange is how much the value must change (in Units) by second, for the system to store the value in the historian. This value overrides the Time Deadband logging interval. |
HistorianTable | Select the table that has the settings you want 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.
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