Siemens SIMATIC S7 System Manual page 409

Configuring the IP information in the System Block dialog (static IP information)
IP information configuration or changes done in the system block are part of the project and
do not become active until you download your project to the CPU.
To access this dialog, perform one of the following:
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
• In the Navigation bar, click the "System Block" button.
• In the Project tree, select the "System Block" node, then
press Enter; or double-click the "System Block" node.
Communication
8.4 Ethernet
409