Rockwell Automation Ethernet Design Considerations Reference Manual - Manual (Page 85)

Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 85
Predict System Performance Chapter 5
Identify and Count Connections
Use your design to identify and count the total number of these connections for
each EtherNet/IP communication module in your system. Performance
prediction is done on a CIP connection basis.
This table describes how to count connections for an EtherNet/IP
communication module
, regardless of whether it is in a local or remote chassis.
Use this table to count the connections for the EtherNet/IP communication
module in the example system shown on
page 84 .
Each 1756-EN2T communication module in the example system uses four
connections.
Connection Type Count Calculation Method
Produced tag between controllers Number of consumers
Consumed tag between controllers Number of tags consumed
Rack-optimized connections Number of chassis to which the controller is making a
rack-optimized connection
Direct connections Number of devices to which the controller is making a
direct connection, such as drives or I/O modules
IMPORTANT The table above is used to calculate connections used by an EtherNet/IP
communication module.
To calculate connections used on a Logix5000 controller, see Logix5000
Controllers Produced and Consumed Tags Programming Manual, publication
1756-PM011 .
Communication Module Connection Type Total
Local 1756-EN2T communication
module Produced tag between controllers 1
(Number of consumers)
Rack-optimized connections to digital I/O
modules 1 x 1 = 1
(Number of chassis to which a rack-optimized connection is made x Number of
rack-optimized connections made to the chassis)
Direct connections to analog I/O modules 2 x 1 = 2
(Number of remote analog modules to which a direction connection is made x Number of
connections per remote analog module)
Remote 1756-EN2T communication
module Consumed tag between controllers 1
(Number of tags consumed)
Rack-optimized connections to digital I/O
modules 1 x 1 = 1
(Number of chassis to which a rack-optimized connection is made x Number of
rack-optimized connections made to the chassis)
Direct connections to analog
I/O modules 2 x 1= 2
(Number of remote analog modules to which a direction connection is made x Number of
connections per remote analog module)