Siemens V1.0 - Manual (Page 15)

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i) Double-click each PROFINET IO Device to display its properties and set the Device
Name. The device name must match the name in the physical device. Downloading a
name to an IO device is described later. If the IP address is not correct, select
“Ethernet…” to change it. Make sure the IP address for IE General and the IP addresses
for the IO devices are on the same network (addresses match through the subnet mask
number of bits). Note: when the IO controller starts communication with the IO device, it
will find the device by name and then set the IP address to this configured value.