Siemens SIMATIC S7 System Manual page 408

Communication
8.4 Ethernet
● Highlight a CPU, and then click "OK".
To enter or change IP information, perform the following:
● Click the required CPU.
● If you need to identify which CPU to configure or change, click the "Flash Lights" button.
This button flashes the STOP, RUN, and FAULT lights for the highlighted CPU in the list.
● Click the "Edit" button to make changes in the IP information.
● Change the following IP information:
– IP address
– Subnet mask
– Default gateway
– Station name
● Press the "Set" button. When the "Set" button is pressed, these values are updated within
the CPU.
● When finished, click "OK".
When you configure IP information for the onboard Ethernet port in the Communications
dialog, this information is "dynamic". If the "IP address data is fixed to the values below and
cannot be changed by other means" checkbox in the system block dialog is not checked,
then you must enter IP information in the Communications dialog. You can enter new IP
address information and update this information in the CPU by clicking the "Set" button.
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System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART