Siemens SIMATIC S7 Manual page 13

MODBUS / TCP communication via the integrated PN interface of the CPU
2XV9450-1MB02; Manual edition 2.1
3. Enter the IP address and the subnet mask.
To establish a connection via a router, enter the address of the router
as well.
4. Click on "New" to assign a name for a new Industrial Ethernet subnet.
Confirm your entries with "OK".
Result: You created a new Industrial Ethernet subnet.
5. Click on the "OK" button.
Result: The properties window of Ethernet interface X2 for PLC 317-2
PN/DP closes.
Commissioning
3-3