Siemens SIMATIC PCS 7 Function Manual page 148

Advantages of fault-tolerant components
4.5 Operator stations
5. Select the WinCC application of the OS server for which you want to configure a fault-
tolerant network connection.
The connection table is displayed in the lower window pane.
6. Select the first empty row in the connection table and select the menu command Insert >
New Connection.
The "New Connection" dialog box opens.
7. Select the desired connection partner in the tree.
8. Select the connection type "S7 connection fault-tolerant" in the "Connection" box.
9. Activate the "Show properties before inserting" check box.
This allows you to make settings or changes to the connection.
10.If redundant CPs for the plant bus are configured in the SIMATIC H stations, activate the
check box "Enable max. CP redundancy (with 4 connection paths)" in the "Redundancy"
group.
11.Click "OK" to save your entries.
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Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA