Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module - Manual (Page 100)

100 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014
Chapter 9 Using the 1756-DHRIO and 1756-DHRIOXT Modules in Remote I/O Applications
Introduction to Remote I/O The remote I/O system lets you control I/O devices that are not in the
controller’s chassis. A 1756-DHRIO channel, configured as a remote I/O
scanner, transfers discrete and block-transfer data between a ControlLogix
controller and remote I/O devices.
The following figure shows an example of a remote I/O system.
Follow these steps when setting up a remote I/O system:
1. Configure the remote I/O adapter.
2. Layout the remote I/O network cable.
3. Connect the remote I/O network cable.
4. Configure the scanner channel.
1756-DHRIO ControlLogix Controller
ControlLogix Chassis
Remote I/O Link Cable: Belden 9463
The scanner channel maintains a list of the full and
partial racks connected to the channel.
Remote I/O node adapter like the 1771-ASB
modules or PanelView operator interfaces
addressed as remote I/O racks
PLC-5 channel or a processor operating as a remote I/O adapter
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