RSView Supervisory Edition Installation Guide

For example, if you create a reference to a tag on a display but do not
specify its area, RSView assumes that the tag’s home area is the same as
the display’s. If the tag does not belong to a data server or HMI server
in the display’s home area, an error will occur when the display is run.
Absolute and relative references
When you refer to an application component, for example a graphic
display, you create a reference to it. Use absolute or relative references
when building commands, or when connecting graphic objects to tags.
Absolute references point directly at a specific component by
referring to the component’s name and the area (or areas, in the case of
nested areas) that contain it. Absolute references are a way of referring
to a specific component in a specific area.
For example, an absolute reference to a display called Detail in an area
called AssemblyLineNorth is /AssemblyLineNorth::Detail.
IMPORTANT
An absolute reference to an application’s root area does
not include the application’s name, even though the
name appears in the root area in RSView Studio.
Relative references point at a component relative to the current
server or area.
For example, a relative reference to a display called Detail is simply the
display’s name: Detail.
Using absolute and relative references
Assume the display called Detail, mentioned above, contains an
absolute reference to a tag called /AssemblyLineNorth::Speed, and a
relative reference to a tag called Temp. The relative reference is simply
the tag’s name: Temp.
If you copy the Detail display to an area called AssemblyLineSouth the
display will still use the tag /AssemblyLineNorth::Speed because you
5–4 RSView Supervisory Edition User’s Guide