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Am I right in my protocol hierarchy? (Ethernet up to fieldbus)

Am I right in my protocol hierarchy? (Ethernet up to fieldbus)

Am I right in my protocol hierarchy? (Ethernet up to fieldbus)

(OP)
Am I right to say that on an Ethernet network PLC communicate with fieldbuses which are "encapsulated" in RS-485 protocol which is "encapsulated" in TCP/IP protocol. If i'm wrong could someone tell me what is the correct hierarchy.

Thanx

Philippe St-Pierre

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