Publication 1756-UM514B-EN-P - February 2003
Using the 1756-DHRIO Module in Remote I/O Applications 8-7
1756-DHRIO Module
Operation in a Remote I/O
Application
The 1756-DHRIO module provides two configurable channels that can
either send and receive messages over DH+ or scan remote I/O
devices. You must set the rotary switches on the module to use the
1756-DHRIO module in a remote I/O application.
Figure 8.2
When a channel is configured for remote I/O, the 1756-DHRIO
module is designed to function as an remote I/O scanner for a
ControlLogix controller. In this case, the following occurs:
· I/O data is exchanged between the 1756-DHRIO module and
remote I/O adapters on the remote I/O link.
· I/O data is exchanged between the 1756-DHRIO module and
the ControlLogix controller.
Set the channel you want to use
for remote I/O to 1.
41277
IMPORTANT
If you require a channel to be configured for DH+,
use Channel A. By doing so, you can connect your
programming terminal to the connector on the front
of the module and communicate to devices on the
network. If only one channel is needed for RIO, use
Channel B.
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