Any project already created for Simatic S7 EM must be stopped.
Click Start > Control Panel and then click PG/PC interface (32bit).
Assign the network adapter for the S7 TCP/IP communication. NOTE: <Networkcard>.TCPIP.x <Active> is recommended. (Do not use *ISO* or *Auto* network adapter.)
Click Diagnostics.
In the SIMATIC NET Diagnostics window, click Test to test the communication.
Click OK.
Click OK, to apply the setting of the SIMATIC NET Diagnostics window.