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Seamless Redundancy
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Where data security is required, zeOn is far ahead. The software not only provides for the usual redundancy but guarantees seamless redundancy, which means that no data is lost even in the time period between the breakdown of one processor and the take over by the back-up. zenon has offered this feature since 1996 and it has been successfully implemented in many power plants.
Seamless redundancy is provided by zenon for low cost already with two, common PCs. How does it work?
- A server and a standby-server are jointly in charge of a project.
- Like in a normal client/server network, the server has the data ownership.
- The standby server acts very much like a client. It receives all data from the server and is fully operable. In contrast to a normal client, however, the standby server records all historical data like alarms, CEL and archives. Also recipes, users, etc. are aligned.
- Because the information is always coming from the server, it is guaranteed to be up-to-date and consistent.
- If the server breaks down, the standby server upgrades itself and takes over all tasks. With the help of an intelligent mechanism, even in the time during the breakdown until the breakdown is detected, no data loss occurs. Seamless Redundancy!
- All linked clients are informed of the server breakdown and connect fully automatically with the new server.
- Once the original server is back online, it connects to the standby server, aligns all data and upgrades itself to be the server again. No data is lost. All linked clients including the standby server reconnect to the server.
The zenon redundancy can be as easily engineered as the zenon network: simply define server and standby server. Further adjustments are unnecessary.
Server and standby server can be used in the plant as operator workspaces. Project changes (i.e. new pictures) are integrated in the project server – also online. The standby server and the connected clients automatically create an online data alignment. All processors always have the same project status!
