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Profibus and Profinet are both field networks (i.e. communicate industrial devices with each other in the site or industrial field) so they are designed to work in industrial environment taking into account factors of dust, humidity, temperature and electromagnetic noise and interference but Profinet speed is about100 Mbits per second where Profibus cannot exceed12 Mbits per second. The maximum number of devices in Profinet network may be at least256 where it is126 for Profibus.
Profinet and Ethernet (definitely Fast Ethernet) have the same concept and wiring but profinet is industrial and more limited in length of cables (100 meter for a network).
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