IP addresses   
5.2 IPv4 address 
  SCALANCE W780/W740 to IEEE 802.11n Web Based Management 
82  Configuration Manual, 08/2018, C79000-G8976-C267-13 
 
Address assignment with STEP 7 
In STEP 7, you can configure the topology, the device name and the IP address; in other 
words, an IP address is specified for the MAC address of the device. If you connect the 
unconfigured device to the controller, the controller assigns the configured device name and 
the IP address to the device automatically. 
For further information on the assignment of the IP address using STEP 7 V5.x and earlier, 
refer to the documentation "Configuring Hardware and Communication Connections STEP 
7", in the section "Steps for Configuring a PROFINET IO System". 
For further information on assigning the IP address using STEP 7 as of V13, refer to the 
online help "Information system", section "Addressing PROFINET devices".