Siemens SIMATIC HMI KP400 Comfort Operating Instructions Manual page 122

Commissioning the device
4.3 Parameter assignment for Comfort Panel
5. If you have selected manual address assignment, enter the corresponding addresses
under "IP Address", "Subnet Mask" and under "Default Gateway", if necessary.
Note
PROFINET I/O error if the PN_X1 and PN_X3 subnet masks are identical
In principle, the two network adapters may be assigned to a shared physical subnetwork.
If you have enabled PROFINET services for PN_X1 and the IP subnet masks of the two
network adapters are identical, PROFINET I/O errors may occur.
Assign a different entry for each network adapter in PROFINET I/O operation under
"Subnet Mask".
Note
You can also configure the network address in the "Devices & Networks" editor in WinCC.
You can find more information on this topic in the WinCC online help.
6. If a name server is used in the network, change to the "Name Servers" tab.
7. Enter the corresponding addresses.
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Operating Instructions, 07/2017, A5E36770603-AB
Comfort Panels