Publication 1756-UM514B-EN-P - February 2003
8-2 Using the 1756-DHRIO Module 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.
Figure 8.1 shows an example of a remote I/O system.
Figure 8.1
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-DHRIOControlLogix controller
ControlLogix chassis
Remote I/O link cable: Belden 9463
The scanner channel maintains a list of all 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
41290
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