104 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Chapter 5 Communication Networks
Communicate Over a Universal Remote I/O Network
For the controller to control I/O over a universal remote I/O network, you must
complete these tasks.
1. Configure the remote I/O adapter.
2. Lay out the remote I/O network cable.
3. Connect the remote I/O network cable.
4. Configure the scanner channel.
For more information about configuring a remote I/O network with the
1756-RIO or 1756-DHRIO modules, see these publications:
• Data Highway Plus-Remote I/O Communication Interface Module User
Manual, publication 1756-UM514
• ControlLogix Remote I/O Communication Module User Manual,
publication 1756-UM534
As you design your remote I/O network, remember the following:
• All devices connected to a remote I/O network must communicate using
the same communication rate. These rates are available for remote I/O:
– 57.6 Kbps
– 115.2 Kbps
– 230.4 Kbps
• You must assign unique partial and full racks to each channel used in
Remote I/O Scanner mode.
Both channels of a 1756-DHRIO module cannot scan the same partial or
full rack address. Both module channels can communicate to 00...37 octal
or 40...77 octal, but each channel can communicate only with one address
at a time in whichever of these two ranges it falls.
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