Rockwell Automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual - Manual (Page 88)

Publication 1794-UM061A-EN-P - July 2006
86 Configure your Digital Module on an EtherNet/IP Network
Rack-optimized Connections For I/O Modules
In this example, assume that each digital I/O module is configured for a
rack-optimized connection to the controller. Analog modules must be
configured for direct connections.
The following table calculates the connections in this example.
The rack-optimized connection conserves connections, but can limit the status
and diagnostic information that is available from the I/O modules.
To optimize the number of available connections, use a rack-optimized
connection between any digital I/O that allow it and the remote adapter that
connects the distributed I/O to the controller via the communication module.
EtherNet/IP Network
Controller With EtherNet/IP
Communication Module
EtherNet/IP Adapters
With I/O Modules
Digital I/O modules Analog I/O Modules Digital I/O Modules
Switch
System Connections Amount
Controller to local EtherNet/IP communication module 0
Controller to EtherNet/IP adapter with digital modules
(rack-optimized connection to each adapter) 2
Controller to EtherNet/IP adapter with analog modules
(direct connection for each analog I/O module) 2
Total Connections used 4