Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 149)

7 • W ORKING WITH NETWORK STATION APPLICATIONS
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HMI projects
HMI projects contain graphic displays, data log models, HMI tags, HMI tag alarms, and
other services. Network station applications can contain only one HMI project.
HMI clients
HMI clients are software programs that obtain information from, or write information to
HMI servers or data servers. FactoryTalk View Studio, the FactoryTalk View SE
Administration Console, and the FactoryTalk View SE Client are all HMI clients.
Areas
All FactoryTalk View applications have one system-defined area called the application
root area, which has the same name as the application. The application root area can
contain one HMI server and one or more OPC data servers. It is a system best practice to
only have one RSLinx Enterprise data server in the root area or individual area .
About the home area
In a network station application, the area that contains a given application component,
such as a graphic display, is called the home area.
When you refer to an application component without specifying the area, FactoryTalk
View SE uses the home area to locate the component.
For example, if an object in a graphic display refers to a tag without specifying an area,
FactoryTalk View assumes that the tag and the display are in the same home area.
If the tag cannot be found in an HMI server or a data server in the display’s home area, an
error is logged when the display is run.
Relative references
You can have both referencing types in a network station application when using Areas. In
a network station application, you use relative references to refer to application
components, such as graphic displays and tags, when building FactoryTalk View
commands or connecting graphic objects to process data.
Relative references point at a component relative to the current application.
A FactoryTalk View SE network station application must have one and only one HMI server. You
can add the HMI server in the root area of the application (the icon and application name in the
Explorer window) or within the areas you have created.