Siemens SIMATIC PCS 7 Configuration Manual page 196

Compiling and downloading
9.4 Compile OS
Procedure
The following steps demonstrate how to compile the OS:
1. Select the "Compile" command in the context menu of the OS project.
2. Click "Next".
3. Check that the configured network connections AS1 and AS2 are selected. In this case,
"Symb. Verb." is selected as the subnet type and "Named Connections" as the WinCC unit.
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Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA