
Chapter 15. Classes from `HistorianSupport.g`
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Chapter 15. Classes from `HistorianSupport.g`

Table of Contents

Historian — encapsulates the Historian facility in the DataHub program.
HistoryBuffer — a set of HistoryValues returned from a Historian query.
HistoryValue — a single value from the Historian, consisting of value, x-axis and quality.
HistTest.g — an example script that demonstrates how to access Historian data.

The functionality of the DataHub Historian features is made available through a Historian class provided in the HistorianSupport.g script located in the require folder of your DataHub installation..


You must require the Historian support methods before you can use them in a script. At the top of your script, include the following line: require (HistorianSupport);

You must require the Historian support methods before you can use them in a script. At the top of your script, include the following line:

require (HistorianSupport);

The HistorianSupport.g file provides three classes: Historian, HistoryBuffer, and HistoryValue. The HistTest.g script provides an example of how these classes are used to query the DataHub Historian.

Chapter 15. Classes from HistorianSupport.g

Chapter 15. Classes from `HistorianSupport.g`