Parameter Based Settings

What are Parameter-Based Time Settings

With Parameter-Based Time Settings, the start date and end date of the Historian query are contained in a Alpana Parameter.
This means that the values can be changed at runtime using User interaction (filters, URL parameters).

*This is useful for letting users explore any time range in the Historian data.

How to configure

!To configure a parameter-based Historian query, the Alpana Parameter containing the values must already exist and have multiple values (exactly 2 values) : the start date and end date.

Use the panel on the left to select an existing Parameter from the dropdown list, or create a new Parameter using the shortcut button :

Hint

A recommended way to proceed is to :

1. have a separate DataSource with field containing a list of possible dates/times for the user to select from (this is easy to do in Excel, CSV, SQL)
2. create a Master Widget for the user to select the date/time, and configure it with the above DataSource
3. make a default selection in the Master Widget, possibly using relative time default selection (if the Widget type allows it), so that the Parameter always has a value
4. configure the Historian query with Parameter-Based Time Settings, using the Parameter that was automatically generated by the Master Widget