WinCC/Redundancy
Increasing system availability due to redundancy in the case of applications
with WinCC is possible by using
- redundant servers,
- redundant communications paths
- and highly available controllers.
The WinCC/Redundancy option gives the user the opportunity to operate two
linked WinCC single-user systems or server PCs in parallel, in order to monitor
each other. For both redundancy partner servers you need one of the two
redundancy licenses that are supplied with the option package. On the failure of
one of the servers, the second server assumes control of the entire system. When
the failed server resumes operation, the contents of all message and process
value archives are copied back to the restored server. All in all, this results
in significantly higher levels of system availability.
Key benefits
- Increased system availability with continuous data integrity
- Automatic switching in the case of a server failure or communications
failure with the server
- Continuous operation and visualization due to automatic switching of
the clients to the intact server
- Automatic matching of all the archives, alarm information and internal
variables in the background after eliminating the disturbance
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Way of functioning
In a normal situation, two WinCC stations or process data servers operate
completely in parallel, i.e. each station has its own process connection and its
own data archives.
If either of the WinCC stations fails, the other one takes over archiving of
messages, process and user data. This guarantees constant data integrity. In
clientserver operation, the system automatically switches clients from the
failed server to the redundant machine. This guarantees continuous visualization
and operation of the plant at each operator station.
When the failed server starts up again, the system automatically matches in
the background all the process values, messages (incl. statuses,
acknowledgements, lists and comments) and data from the user archive for the
down period (without influencing online operation) this means that two
stations are available again that have the same data.
Additional increase in system availability
In addition to using the WinCC/Redundancy option for running two servers in
parallel, it is possible in a WinCC application to also implement redundant
communication channels to the SIMATIC S7 controller. You do this by installing
two communication modules and implementing duplicate communication paths
(communication software S7-REDCONNECT needed). By using H-series SIMATIC S7
controllers, you can, if required, additionally increase availability at the
control level.
By combining system solutions, you can create a security concept that meets even
the most demanding requirements.
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