Rockwell Automation 1734-AENTR EtherNet/IP Network Configuration User Manual User Manual
Page 65
Rockwell Automation Publication ENET-UM001L-EN-P - March 2014
65
Interlocking and Data Transfer between Controllers Chapter 6
All EtherNet/IP communication modules support as many as 32 produced
multicast connections. Because each tag that passes through an EtherNet/IP
communication module uses a single connection, the number of available
connections limits the total number of tags that can be produced or consumed. If
the communication module uses all of its connections for I/O and other
communication modules, no connections remain for produced and consumed
tags.
This graphic shows a Logix5000 controller producing a single tag for
consumption by another Logix5000 controller. In this example, the producing
controller uses 2 connections and every other Logix module/controller uses only
1 connection.
Figure 8 - Logix5000 Controller in Local Chassis Producing a Single Tag for a Logix5000 Controller
in a Remote Chassis
At its limits, a Logix5000 controller that produced 125 tags, each with only 1
consumer, the controller would use all of its available 250 connections. In this
example, the EtherNet modules used to communicate the tags would use only
125 connections. An example of the different.
For more information on using connections over an EtherNet/IP network, see
Ethernet Design Considerations Reference Manual, publication
.
IMPORTANT
Depending on whether it is producing or consuming a tag, a Logix5000
controller uses its connections differently.
Table 13 - Number Connections for Produced and Consumed Tags
Type of Tag
Device
Number of Connections Used
Produced tag
Logix5000 controller
Number_of_consumers + 1
EtherNet/IP communication
module
1
Consumed tag
Logix5000 controller
EtherNet/IP communication
module
1
Logix5575
EtherNet/IP
ControlNet
OK
FORCE SD
RUN
RUN
REM
PRO
G
1 2
LNK1 LNK2 OK
10/100 BASE T
EtherNet/IP
1 2
LNK1 LNK2 OK
10/100 BASE T
Local Controller (producer controller)- 1768 CompactLogix controller
Connections Used = 2 (1 + Number of consumers)
Remote Controller (consumer controller) - ControlLogix controller
Connections Used = 1
Local Communication Module -
1768-ENBT
Connections Used = 1
Remote Communication Module
- 1756-EN2T
Connections Used = 1