From PCS 7 V8.1 onwards, encrypted communication is possible. If you activate encrypted 
communication, only the computers for which a common key is defined can communicate with 
each other. You can find additional information on this in the "SIMATIC Process Control System 
PCS 7 - PC Configuration" (https://support.industry.siemens.com/cs/ww/en/view/109485951) 
manual.
If all stations are available you can manage all stations centrally via the network using the 
Microsoft Management Console (See "Tools for PC administration (Page 40)").
4.3.7 Configuring the plant bus
Communication of a PCS 7 ES via the plant bus
In SIMATIC PCS 7, the "S7 online" access point must be set to the "PC internal" interface. All 
access to the AS – in order to check the module information of an AS or to download S7 
programs, for example – is performed via "PC internal". "PC internal" is a centrally configurable 
interface, which can be loaded with project-specific settings for all stations on the plant bus. 
The settings are made on the ES in the PCS 7 multiproject and downloaded from the ES. You 
can find the relevant procedure in Section "Engineering Station (Page 56)".
Preparation and administration
4.3 Installation
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA  35