Siemens SIMATIC PCS 7 System Manual page 14

Configuring AS-OS communication
3.1 Setting up an S7 connection
5. Specify a local ID in the "Properties - S7 Connection" dialog.
Note
The local ID is needed for configuring the communication blocks of the User Archive Read
Manager and User Archive Write Manager.
6. Click "OK".
The connection is created and displayed in the connection table of the NetPro window.
7. If you want to configure a redundant connection to the OS, create a second connection
using the same procedure.
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Advanced Process Functions Engineering Manual
System Manual, 07/2016, A5E38719921-AA