64  Rockwell Automation Publication CNET-UM001F-EN-P - February 2018 
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. 
 
This table calculates the connections in this example. 
Table 12 - Connection Calculations 
System Connections  Amount 
Controller to local ControlNet communication 
module 
0 
Controller to ControlNet adapters with digital 
modules (rack-optimized connection to each 
adapter) 
2 
Controller to ControlNet adapter with analog 
modules (direct connection for each analog I/O 
module) 
2 
Total connections used  4 
The rack-optimized connection limits connections, but can also limit the 
status and diagnostic information that is available from the digital 
I/O modules. 
To increase the number of available connections, use a rack-optimized 
connection to any remote adapter with multiple digital I/O modules that 
permit rack-optimized connections, instead of direct connections to those I/O 
modules. 
Connections for I/O 
Modules