User manual

Publication ENET-UM001I-EN-P - January 2010 213

Appendix

EtherNet/IP Network Connections

Introduction

EtherNet/IP communication modules use connections to manage

communication. A connection is a point-to-point communication mechanism

used to transfer data between a transmitter and a receiver. The EtherNet/IP

communication modules use these connections:

• CIP connections for Logix-based communication.

A CIP connection transfers data from one Logix application running on

one en

d node to a second Logix application running on another end

node. A CIP connection is established over a TCP connection.

• TCP/IP connections for EtherNet/IP communication.

A single TCP connection can support multiple CIP connections.

CIP Connections

Connected modules communicate more reliably than do unconnected

modules.

Examples of functions supported by CIP implicit (connected) messaging

include:

•

Logix controller message transfer to Logix controller

• I/O or produced/consumed tag.

•program upload.

• RSLinx DDE/OPC client.

• PanelView polling of Logix controller.

Topic Page

CIP Connections 213

TCP Connections 214

Multicast Address Limit 215