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Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 59

Chapter 4

EtherNet/IP Protocol

The EtherNet/IP protocol is standard Ethernet and standard IP technologies

with standard CIP technology at the application layer.

Connections

EtherNet/IP communication modules must consider connections and EtherNet

nodes to communicate on the EtherNet/IP network. The number of supported

nodes applies only to CompactLogix 5370 controllers. See page 65

A connection is a point-to-point communication mechanism used to transfer

data between a transmitter and a receiver. Connections can be logical or physical.

Two connection types--TCP connections and CIP connections--are layered over

each other each time data is transferred. The TCP connection is the first

connection established. It is used for all EtherNet/IP communication and is

required for all CIP connection use. A single TCP connection supports multiple

CIP connections and remains open.

Established over TCP connections, EtherNet/IP CIP connections transfer data

from an application running on one end-node (transmitter) to an application

running on another end-node (receiver). CIP connections are configured to use

explicit or implicit message types. The message types support connected and

unconnected connection types. Typically, connected CIP messages are used to

transfer data. Unconnected CIP messages are used, but they are only temporary.

Topic Page

Connections 59

EtherNet/IP Network Specifications 66

Packets Rate Capacity 69

Requested Packet Interval (RPI) 70

Messaging 71

CIP Safety 73

CIP Sync 74

Integrated Motion on an EtherNet/IP Network 76

Connectivity to IT 77

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario Pagina 59