Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario descargar pdf (Pagina 60)

60 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013

Chapter 4 EtherNet/IP Protocol

This graphic shows how connections are layered on each other when data is

transferred over the EtherNet/IP network.

Remember these points when configuring your EtherNet/IP network

application:

• All of the connections are used each time data is transferred on the

EtherNet/IP network.

• You specify CIP connection message types and CIP connection types

when configuring your application.

For example, when a Logix5000 controller sends a MSG instruction to

another Logix5000 controller, the transmitter sends the instruction to the

receiver over a connection. That connection includes the following:

– A TCP connection is established.

– A CIP connection is layered on the TCP connection.

– An explicit or implicit CIP connection message is delivered via the CIP

connection.

– If an explicit message type is used, it can be connected or unconnected.

If an implicit message type is used, it is connected.

• Each EtherNet/IP communication module has TCP and CIP connection

limits that you must account for when configuring your application. For

more information on connection limits, see Table 12 on page 66

• Refer to Nodes on an EtherNet/IP Network

on page 65 for node count

limitations for CompactLogix 5370 controllers.

TCP Connection

CIP Connection

Explicit Implicit

CIP Connection Message Types

Connected Connected

CIP Connection Types

Unconnected

You do not execute any tasks to

establish these connections.

Your decisions when configuring

your application determine the

parameters of these connections.

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario Pagina 60