Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 342)

342 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 6 Integrated Motion on the EtherNet/IP Network Applications for PowerFlex 755 AC Drives
The primary disadvantage of a star topology is that all end devices must typically
be connected back to a central location, which increases the amount of cable
infrastructure that is required and also increases the number of available ports
required by the central switch leading to a higher cost per node solution.
Linear Topology
In a linear topology, the devices are linked together via a two port embedded
switch or through an EtherNet/IP network tap (1783-ETAP), instead of being
connected back to a centralized network switch.
Either a Dual Port EtherNet/IP Option Module or an EtherNet/IP network tap
(1783-ETAP) is required for this network topology (this diagram illustrates an
application using the dual port option card). For more information about
applying a Dual Port EtherNet/IP Option Module, see the PowerFlex 20-750-
ENETR Dual-Port EtherNet/IP Option Module User Manual, publication
750COM-UM008 .
Although the ControlLogix controller is illustrated, the CompactLogix
controller could also be used.
Advantages/Disadvantages
The advantages of a linear network include the following:
• The topology simplifies installation by eliminating long cable runs back to
a centralized switch.
• The network can be extended over a longer distance because individual
cable segments can be up to 100m.
Programming Software
ControlLogix
1756-ENxTR
HMI
Point I/O
PowerFlex 755 PowerFlex 755 PowerFlex 755 PowerFlex 755
1585J-M8CBJM-x
EtherNet (shielded) Cable