VPN tunnel between SCALANCE M-800 and security CPs   
4.2 Secure VPN tunnel with PSK 
  SCALANCE M-800 Getting Started 
148  Getting Started, 06/2015, C79000-G8976-C337-04 
6.  Enter the values assigned to the SCALANCE M-800 from the "Settings used (Page 143)" 
table. 
 
7.  Confirm the dialog with "OK". 
The CP and the SCALANCE M-800 will then be displayed in the list of configured modules. 
 
Configuring a tunnel connection 
A VPN tunnel for secure communication can only be established if the SCALANCE M-800 
and the CP are assigned to the same VPN group.