Rockwell Automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual - Manual (Page 86)

Publication 1794-UM061A-EN-P - July 2006
84 Configure your Digital Module on an EtherNet/IP Network
Choose Direct or Rack-optimized Connection
The Logix5000 controller uses connections to transmit I/O data. These
connections can be direct connections or rack-optimized connections.
Term Definition
Direct Connection A direct connection is a real-time, data transfer link between the controller and an I/O
module. The controller maintains and monitors the connection with the I/O module. Any
break in the connection, such as a module fault or the removal of a module while under
power, sets fault bits in the data area associated with the module.
Rack-optimized
Connection For digital I/O modules, you can select rack-optimized communication.
A rack-optimized
connection consolidates connection usage between the controller and all the digital I/O
modules in the chassis (or DIN rail). Rather than having individual, direct connections for
each I/O module, there is one connection for the entire chassis (or DIN rail).
A direct connection is any connection that does
not use the Rack Optimization Comm Format.
Rack-optimized Connection