Siemens SIMATIC S7 System Manual page 77

Note
The CPU does not have a pre-configured IP address. You must manually assign an IP
address for the CPU. If your CPU is connected to a router on a network, you must also enter
the router's IP address. All IP addresses are configured when you download the project.
Refer to "Assigning IP addresses to programming and network devices (Page 212)" for more
information.
The following table defines the parameters for the IP address:
Parameter
Subnet
IP protocol
S7-1200 Programmable controller
System Manual, 11/2009, A5E02486680-02
Description
Name of the Subnet to which the device is connected. Click the "Add new subnet"
button to create a new subnet. "Not connected" is the default.
Two connection types are possible:
The "Not connected" default provides a local connection.

A subnet is required when your network has two or more devices.

IP address Assigned IP address for the CPU
Subnet mask Assigned subnet mask
Use IP router Click the checkbox to indicate the use of an IP router
Router address Assigned IP address for the router, if applicable
4.8 Configuring an IP address in your project
IP addresses properties:
In the Properties window,
select the "Ethernet
address" configuration
entry. The TIA Portal
displays the Ethernet
address configuration
dialog, which associates
the software project with
the IP address of the CPU
that will receive that
project.
Device configuration
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