Description
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.
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
Functionality
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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