Selecting a Data Source

Drawing methods require a data source to provide the value that is being shown.  Most commonly, the data source for a drawing method will be a tag’s value, but this is not the only option.  You can also select page parameters. (See diagram.)

The differences between the choices are as follows:

Tag:  Use the Tag Browser to select any tag whose value can be represented by this drawing method.

Parameters:  The tag selection area is replaced by a parameter selection.  From this control you can select any page parameter (or descendants of that page parameter) whose type has a value that can be represented by this drawing method.