Data Life Cycle

Tag data is collected and stored in the database, and can later be modified by editing or by importing external data.Use the Data modules to manage the data and the data changes.

Collecting data

Site data is collected from sensors and stored in the memory of the site RTU as tag values. When data changes, or when the RTU is polled, the data values are written to the database . For each tag, the database stores a collection of timestamped values.

Use these tools to view the data history for a tag:

Site Tags Module or the Data Sources Module to view the current value of timestamped data.
Data History Module to capture a view of the data at any specific date and time.

Use these tools to export tag data:

Changing Data

These historical values may be modified at a later date to change the value stored in the database against a timestamped event.

Example

You may have a had a faulty sensor that stored spurious data values in the database. You can edit the data to remove or change these values.
You may collect provisional data at a site, but later overwrite this low-quality data with imported quality-controlled data from an external source.

Use these tools to make changes to the stored data:

Data Editor Module to make changes to individual data values.
Data Import Module to import a set of data values from an external source.

Use these tools to view the details of any changes:

Data History Module to capture a view of the data at any specific date and time.
Data Audit Log Module to examine the details of any data changes including who made the changes and why.

Calculated data

Calculated data includes data derived from rating tables or from tag expressions. If imported data is the source for any calculated values, the dependent values are automatically recalculated when the source value changes.