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InstantHMI EtherNet/IP Interface |
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Ethernet/IP is an 'Encapsulation Protocol' which carries forward the flavor of TCP/IP (and UDP/IP) very well. The EIP encapsulated message packet transmitted over the Ethernet media (Layer 1 in OSI 7-layer network representation) is embedded in a TCP/IP packet. This packet consists of Ethernet (link Layer 2) header, IP header (Layer 3), TCP header followed by the EIP encapsulation header and encapsulation specific data in the Common Packet Format (CPF). Traditionally, TCP/IP is a connection-oriented protocol unlike UDP/IP. EIP uses 'CIP connections' between Application Objects (residing in separate Client/Server IP nodes) over both TCP and UDP transport layers (Layer 4). CIP connection IDs, sequence numbering, duplicate message detection etc. are used to maintain dependable message transfer between application nodes. InstantHMI EIP implementation uses TCP/IP Sessions (Layer 5) between Client and Server nodes to perform Explicit Messaging using CIP connections between application objects (layer 6 - Presentation, and layer 7 - Application). |
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