Rockwell Automation Publication CNET-UM001F-EN-P - February 2018  63 
In this example, assume that each distributed I/O module is configured for a 
direct connection to the controller. 
 
The table below calculates the connections in this example. 
Table 11 - Connection Calculations 
System Connections  Amount 
Controller to local ControlNet communication 
module 
0 
Controller to ControlNet adapter(1)  
Direct connection for digital I/O modules 
Direct connection for analog I/O modules 
0 
5 digital 
2 analog 
Total connections used  7 
 
Direct connections to many modules may not be feasible because the module supports a finite number of 
connections, and direct connections may require more resources than the module has available. 
In this case, use rack-optimized connections. Refer to Rack-optimized Connections for I/O Modules on page 60 on 
page 64 for more information on how to limit connection use and network traffic. 
 
Direct Connections for I/O 
Modules