RSView Supervisory Edition Installation Guide

Using tag references
When you type a tag name, you are creating a reference to the tag. For
example, you might refer to a tag called FanRunning to obtain its value
for animating a graphical representation of a fan in a graphic display.
The Tag Browser composes references to tags automatically, using
correct syntax. You can also create references to tags manually, by
typing the tag name and, optionally, its path.
In distributed applications you can refer to a tag using an absolute
reference or a relative reference. In stand-alone applications you only
use relative references.
Absolute references
Absolute references are a way of referring directly to a specific tag in a
specific area by providing the tag’s name and the path to it.
For example, /Cooling/Fans::Extractor is a reference to an extractor
fan in the Fans subarea of the Cooling area.
Use absolute references when you want to ensure that you are referring
to a specific tag in a specific location.
Relative references
Relative references point at a tag relative to the current server or area.
For example, Extractor is a reference to an extractor fan in the current
area.
Relative references are useful if tag names are all the same, but they are
in different areas. This might be the case if you expect to clone identical
areas, for example to represent identical production lines in a plant. For
more information about areas, see page 5-3.
Working with tags 8–15