Siemens SIMATIC PCS 7 Configuration Manual page 149

The OS will then need to be compiled and downloaded if AS-OS connections are changed.
Downloading to the ES
Always start with the Engineering Station when downloading stations.
1. Select the ES and then
2. select the menu command "PLC > Download to Current Project > Selected Stations".
Downloading to OS servers
Download the configuration to SERVER1A and SERVER1B too.
Downloading to AS stations
The "PLC > Download to Current Project > Selected Stations" function loads the complete
configuration including HW Config to the AS. This function can only be performed in the STOP
operating state.
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA
Configuration of the network connections
7.3 Downloading connections
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