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Chapter 3 Tag Configuration
BridgeVIEW User Manual 3-6 © National Instruments Corporation
Note If you delete a tag and save the .scf file, the tag and its configuration information
are removed from the
.scf file. You still can retrieve historical and event
information about the tag, but information such as the tag description, units,
range, and alarm settings is lost.
What are Network Tags?
BridgeVIEW makes it easy to create distributed applications so more than
one computer can be involved in an HMI application.
A BridgeVIEW server is a computer that allows tags configured in the
current
.scf
file to be accessed by other machines connected to the server
via a network. The server machine may or may not have an HMI running
on it. In order for a machine to function as aBridgeVIEW server, the
Engine must use an
.scf
file that has the Allow Network Access option
enabled.
A BridgeVIEW client is a computer that gets its data through tags from one
or more BridgeVIEW servers. Tags remotely accessed from BridgeVIEW
servers are network tags. An
.scf
file for a BridgeVIEW client can have
network tags from multiple BridgeVIEW servers. However, a BridgeVIEW
client
.scf
can import network tags from only one
.scf
file per server
machine.
A BridgeVIEW server can also act as a client and get its data from other
BridgeVIEW server machines, as shown in the illustration below.
Figure 3-2.
Flowchart of Server/Client Interaction
BridgeVIEW Servers
BridgeVIEW Clients
BridgeVIEW
Server/Client