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VTS
| Redundancy Out of
the Box - VTS has the ability to share data over a
network as one of its out-of-the-box capabilities.
One PC on the network can be designated as a data
server for a particular PLC, and the remaining PCs
on the network can act as clients. This means that
only the server PC actually communicates with the
PLC. This Server can, and normally does, function
as any other operator station. It is not restricted
to just being a data concentrator as with other HMI's,
and can switch to becoming a client in fail-over scenarios.
The remaining clients all get their data for that
PLC from the server PC. This limits the communication
to each PLC, vastly improving communication updates.
VTS also allows for redundancy in its data servers.
A list of backup data servers can be assembled such
that, if the first data server drops off of the network
the second data server, which could be a client, automatically
picks up the server responsibility. This can be continued
with a second backup data server and so on. This arrangement
produces efficient data propagation and can be arranged
in a variety of network paths such as a star node
or ring. It is has been used in some cases to provide
a redundancy level of 28 backup servers.
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