62 Rockwell Automation Publication 1794-UM061B-EN-P - March 2020
Chapter 6        Configure Your Adapter and Digital Modules on a ControlNet Network
For I/O modules, the available communication formats depend on the module 
type. In general:
See online help in RSLogix 5000 programming software for specific 
communication formats per I/O module.
If you have this type of I/O module: And want: Select a communication format that specifies:
digital module a rack-optimized connection Rack Optimization
a direct connection or to use 
specialty features of the module, 
such as diagnostics, timestamps, 
or electronic fuses
or
to only listen to data from the 
module.
The data your controller needs from the I/O module. For 
example, if your application uses a 1756-IA16I module 
in a remote chassis that must provide timestamped 
input data, you should select the CST Timestamped 
Input Data communication format.
A Listen Only communication format that matches the 
data the I/O module is broadcasting to other controllers.
analog module a direct connection or to use 
specialty features of the module, 
such as diagnostics, timestamps, 
or electronic fuses
or
to only listen to data from the 
module.
The data your controller needs from the I/O module. For 
example, if your application uses a 1756-OF6CI module 
in a remote chassis that must provide floating point 
output data, you should select the Float Data 
communication format.
A Listen Only communication format that matches the 
data the I/O module is broadcasting to other controllers.