Os Clients; Failover Reactions Of Os Clients With Permanent Operability - Siemens SIMATIC PCS 7 Function Manual

Failure, Switchover and Return of Fault-tolerant Components

6.7 OS clients

6.7 OS clients
6.7.1

Failover reactions of OS clients with permanent operability

Functionality
If the network for the configured OS server is interrupted, the process values on the OS clients
are no longer updated. After successful failover to the partner server, the process can be
operated again on all assigned OS clients. Other OS clients interconnected with the redundant
OS partner server are not affected by this. The plant operator can therefore switch to these
OS clients, if needed.
Example configuration
Permanent operability
If OS Server 1 fails, OS Client 1 is connected to redundant OS Server 2. The identity of the
redundant partner server of OS Server 1 comes from the downloaded server data on the OS
client. OS Client 1 is not available during the failover to redundant OS Server 2. However, if
redundant OS Server 2 is specified as the preferred server for OS Client 2, you can continue
to operate the plant during the failover from the failed OS Server 1 to redundant OS Server 2.
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Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA