Rockwell Automation Allen-Bradley ControlNet 1734-ACNR User Manual page 62

4-6 Control I/O
Publication CNET-UM001C-EN-P - November 2005
Direct Connections for I/O Modules
In this example, assume that each distributed I/O module is configured for a
direct connection to the controller.
ControlNet Network
I/O I/O
ControlNet Adapter with ControlNet Adapter with
Digital I/O Modules Analog I/O Modules
This table calculates the connections in this example.
Table 4.3 Connection Calculations
System Connections
Controller to local ControlNet communication module
Controller to ControlNet adapter
direct connection for digital I/O modules
direct connection for analog I/O modules
(1)
In this example, the remote ControlNet adapter uses the None communication format.
TIP
Controller with ControlNet
Communication Module
I/O I/O
ControlNet Adapter with
Digital I/O Modules
(1)
total connections used: 6
If you have a high number of modules, direct connections
to each module 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 (see the
section Rack Optimized Connections for I/O Modules) to
conserve connection use and network traffic.
I/O I/O
Amount
0
0
4
2