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What role does the VLAN symbol in the Ethernet data frame play in PROFINET?

April 26, 2017Data Ethernet frame play profinet symbol VLAN

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What role does the VLAN symbol in the Ethernet data frame play in PROFINET?

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The VLAN symbol is always used in every RT frame. NRT Frames may use it. With the VLAN Tag it is possible to increase the priority of a frame to be sent. Normally it is enough to distinguish the priority with our Ethertype for RT (0x8892). But to ensure interoperability with older Ethernet switches we also use the VLAN Tag.