About this task
This topic describes how to create an unsolicited trigger for a calculation, and how to set
up a dependency list:
Before you begin
If you want to browse for tags while adding a trigger tag,
ensure that the
Calculation collector is running.
Procedure
-
Access Historian Administrator.
-
Select Tags, and then select the tag to which you want
to apply the trigger.
-
In the Collection section, select Unsolicited
from the Collection Type, and specify an interval.
- Select Calculation.
- Select Add to add a trigger.
The Insert Function window appears.
-
In the Trigger Tag field, enter the name of the trigger
tag that you want to use in the calculation.
The wizard automatically populates the
Trigger
Tag field and updates the
Function
Preview field, as shown in the following figure:
![](i_Calculation_Collector_function_preview_field.png)
- Select Insert.
The trigger is added to the
Calculation Triggers section.
![](i_Calculation_Collector_trigger_list.png)
In addition, the trigger list appears when using
the Insert Function window to build a calculation
formula for an event based tag.
-
Select Update.