This blogpost is the second in a series of seven, inspired by the most frequently asked questions we receive regarding PROFINET.
PROFINET is not a closed network. PROFIBUS, as a serial fieldbus for example, was a closed network. By closing the network, PROFIBUS was able to ensure determinism. Despite being an Ethernet-based protocol, the choice was made early-on to keep a PROFINET network open. With the widespread adoption of Ethernet and now Industry 4.0, today we are able to appreciate what a wise decision that has become. Profinet utilizes standard unmodified Ethernet, meaning any Ethernet-based protocol can utilize the infrastructure. Inherent PROFINET mechanisms ensure the determinism required for industrial automation.
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