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Overview

The Historian Namespace exposes properties and methods from the .NET objects used by the Historian Module execution. You can use these properties and methods on your Displays or to create Scripts and Alarms.

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Runtime Attributes

HistorianTables Tag Historian Values

Like all objects in the platform, HistorianTables have their own set or properties and methods. 

Particularly, there are a few methods that are frequently used by the application, which focus on retrieving the historian contents and generating a DataTable with the results.

These methods are mainly on the Tag namespace and HistorianTabe namespaces, using the TK toolkit methods.

Method

Description

TK.GetTagHistorian

Gets Historian data from a Tag, given a date range

TK.GetValueFromHistorian

Gets one specific value from the Historian Database

Historian.Table.Table1.SaveToTextFile

Export contents to CSV files

Historian.Table.Table1.GetObjectList

Get List of Tags used by each HistorianTable


Some other methods focus on the state of the execution of the Historian Module itself.

Property Path

Type

Description

Historian.IsStarted

Boolean

Indicates if

Runtime Attibutes

Below you find a table describing the most used properties from the Historian Namespace. Access the Historian Namespace page for a complete list of available options.

Property

Type

Description

Property path on CodeBehind

IsStarted

Boolean

Indicates

the operational status Module Historian has started.

When true

  • True, the Module Historian actively archives data.
When false
  • False, no data archiving occurs.

Historian.

IsStarted

OpenStatusMessage

String

Indicates the success or failure when initiating the Module Historian. If the Module Historian starts successfully, the system returns an OK string.

The system provides a descriptive error message in case of failure during the initiation process to help you diagnose and troubleshoot the issue

otherwise returns error message.

Historian.

OpenStatusMessage

EnableCache

Boolean

A Boolean flag that enables the creation of temporary binary files on the server to optimize the TrendChat object performance when handling large datasets. Setting to true improves responsiveness and efficiency.

Historian.EnableCache


To learn about the basic concepts of namespaces and objects, you can refer to → Read more about Objects, and access the Namespace API, at Objects and Namespaces.

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