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1 Publication 1761-UM006A-EN-P - February 2001
Chapter
3
Operation
This chapter describes ENI operation. The following information is
included:
• Operation Overview
• Allocation of Ethernet Connections
• ENI Functional Overview
• Program Upload/Download and On-Line Sessions
Operation Overview
Ethernet is the protocol used to transport TCP/IP messages. On top of
TCP, Ethernet/IP is the open protocol used by the ENI. Ethernet/IP
allows devices to exchange information (data); or to upload,
download, and edit logic programs over Ethernet.
To communicate between devices, Ethernet/IP uses a “connection”
model. Connections are dedicated paths across Ethernet between
devices.
Allocation of Ethernet
Connections
The ENI supports a maximum of 6 connections, allowing
simultaneous communication with up to 6 other devices or
applications. The connections are dedicated as follows:
Number of Connections Dedicated to:
2 outgoing messages
2 incoming messages
2 either incoming or outgoing messages
TIP
For peer connections, no more than one connection
per destination node is established. If multiple MSG
instructions use the same destination node, they use
the same connection.