Rockwell Automation Publication 1769-UM011H-EN-P - April 2012 49
Communicate over Networks Chapter 4
Figure 4 - CompactLogix EtherNet/IP Overview
Connections over an EtherNet/IP Network
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 is triggered by the requested packet
interval (RPI) or the program, such as a MSG instruction. Unscheduled
messaging lets you send and receive data when needed.
Switch
Distributed I/O
1756-ENBT Module
(as an adapter) with 1756 I/O
Modules
1794-AENT Adapter with 1794
I/O Modules
Workstation
CompactLogix Controller with
Integrated EtherNet/IP Port
CompactLogix
Controller with
1756-ENBT Module
FlexLogix Controller with
1788-ENBT Module
1734-AENT Adapter
with 1734 I/O Modules
PowerFlex 700S AC Drive
with DriveLogix
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