Siemens SCALANCE X-300 Configuration Manual page 330

PROFINET IO functionality
6.1 Configuring with PROFINET IO
9. Select the Station > Save and Compile menu command.
10.Interconnect the devices over the network and turn on the power supplies of the
networked devices.
Figure 6-6 HW Config assigning PROFINET IO device names
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Configuration Manual, 10/2014, C79000-G8976-C187-22
SCALANCE X-300 / X-400