In this scheme, myPANEL is connected to SCADA server and the server then communicates with the PLCs. The main advantages are:
multiple myPANELs can be connected to the SCADA server, all user actions are logged on the server, possibility to control everything from one myPANEL, high performance (load is balanced), the server lowes the PLC load when multiple myPANELs are connected to one PLC.