Add a virtual tag script to your free-form dashboard to generate virtual tags to
bind to a widget. Virtual tags enable you to visualize and analyze your tag
data in a customized way.
Note
This dashboard type is deprecated. NI recommends
that you use tile dashboards instead of free-form dashboards for new
visualizations you create.
A virtual tag uses real tags from your SystemLink Server as parameters. When these parameters, or real tags, pass values
to the main function of your script, the value of the virtual tag updates. As a result, you can only see values of virtual
tags on your dashboard.
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In Dashboards, open the dashboard to which you added an event script to a
widget.
-
Click
.
-
In the
configuration pane, under
Scripts, click
+ to add a virtual tag.
The
Script window opens.
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Enter the main function name of the event script you previously added to a widget in the dashboard.
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Add input tags to your script.
-
Click
+.
-
Specify the tag's path that exists on your SystemLink Server.
The tags you specify automatically become parameters passed to the script.
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Add output tags you want the script to create.
-
Click
+.
-
Specify the path of the virtual tag you want to create.
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In the Script window, enter
def and press Ctrl+Space to autogenerate the function definition and return statement.
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Add your Python code that performs the logic of the script.
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When you finish adding your Python code, click
OK.
Dashboards lists the script in the configuration pane.
-
Click
Save and
Play to view your dashboard.
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To make changes to your virtual tag script, double-click the script in the
configuration pane.
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