Historian

The Historian stores tag values historically and provides an audit of important events through the event log.

Historic Tag Data

Any Data Point Tag can be configured to store values historically. You can control the volume and frequency of data stored using these configuration options:

Significant change deadband,
Sample Interval,
Number of samples stored.

A dedicated trend display allows you to view tag data historically:

You can also access time-stamped data from:

The Show Historic Data option in the configuration tool Tag Window Menu
3rd party OPC aware applications using the OPC Historic Data Access server
3rd party ADO.NET aware applications using the ADO.NET Data Provider.
3rd party ODBC aware applications using the ODBC Driver.

Event Log

Viewing the Event Log:

Three types of event are recorded in the event log:

Tracking - An event directly caused by an operator action
Condition - An event related to a change in state of an alarm condition
Simple - All other events not related to an operator action or alarm condition

You can access the Event Log from:

The Show Events option in the configuration tool Tag Window Menu
The view menu in the Fernhill SCADA Notification Icon.
3rd party OPC aware applications using the OPC Alarm and Event server
3rd party ADO.NET aware applications using the ADO.NET Data Provider.
3rd party ODBC aware applications using the ODBC Driver.