Siemens SIMATIC PCS 7 Function Manual page 86

Fault-tolerant Solutions in PCS 7
3.5 Solutions for OS servers
OS partner servers (OS_Stby) are configured in the SIMATIC Manager. Using the menu
command PLC > Download synchronizes the functionality.
Redundant external archive server
If an external archive server of a server pair fails, the data is automatically synchronized on
the return of the failed external archive server.
PCS 7 provides the following options for centralized collection of archive information for the
process control system:
● Process Historian
You can set up two Process Historians with redundancy functionality for fault-tolerant
operation. The associated information server can be configured in such a way that it
connects to the active Process Historian to execute tasks.
● Central archive server
You can set up two central archive servers with redundancy functionality for fault-tolerant
operation.
This server does not require a connection to the plant bus.
Redundant maintenance station
PCS 7 allows you to configure two maintenance servers with redundancy functionality for fault-
tolerant operation.
Setting up a redundant OS server
The following configuration shows the basic operating principle of redundant OS servers.
Note
You need to connect the redundant PC stations through a redundancy connection. This
connection offers security against problematic behavior during communication between the
OS servers.
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Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA