(1) Total packet rate capacity = I/O Produced Tag, max + HMI/MSG, max Packet rates vary depending on packet size. For more detailed specifications, see the capacity section of the EDS file for the catalog

number.

(2) These are the maximum numbers of CIP I/O connections.

134

EtherNet/IP Network Connections

CompactLogix 5370 controllers use connections to manage communication on

the EtherNet/IP network. A connection is a point-to-point communication

mechanism that is used to transfer data between a transmitter and a receiver.

Connections can be logical or physical.

You indirectly determine the number of connections the controller uses by

configuring the controller to communicate with other devices in the system.

Connections are allocations of resources that provide more reliable

communication between devices than unconnected messages.

All EtherNet/IP connections are unscheduled. An unscheduled connection is a

message transfer between controllers that the requested packet interval (RPI) or

the program, such as a MSG instruction, triggers. Unscheduled messaging lets

you send and receive data when needed.

This table lists information for CompactLogix 5370 controllers.

CIP

Unconnected

Messages

TCP

CIP

(backplane +

Ethernet)

120

256

Rockwell Automation Publication 1769-UM021G-EN-P - October 2015

Packet Rate Capacity

SNMP

(1)

(packets/second)

Support

(password

I/O

HMI/MSG

required)

6000 @ 500

400

Yes

bytes/

messages/s

packet

@ 20%

comm.

timeslice

Media

Produced/Consumed Tags

Support

Number of

Unicast

Multicast

Available

Tags,

(2)

max

Twisted Pair

32 multicast

Yes

produced

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Ethernet/Ip Network Connections - Allen-Bradley 1769-L16ER-BB1B User Manual