Instruction Manual

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 135
Chapter 11
Connecting a ControlLogix Controller
to Remote I/O
What This Chapter Contains
This chapter describes how to use the 1756-DHRIO and 1756-DHRIOXT
modules in remote I/O scanner mode to connect a ControlLogix controller to
remote I/O.
Topic Page
Scan Remote FLEX Adapters through One 1756-DHRIO or
1756-DHRIOXT Module in a Local 1756-Chassis
136
Scan Remote FLEX Adapters through Multiple 1756-DHRIO or
1756-DHRIOXT Modules in a Local Chassis
138
Scan 1771 Remote I/O Adapters through a 1756-DHRIO or
1756-DHRIOXT Module in a Remote Chassis
141
IMPORTANT
In these examples, only channel B is configured as a remote I/O scanner.
You can configure the channels as remote I/O scanners simultaneously if
necessary.
If only one channel is configured as a remote I/O scanner, we recommend
you use channel B. If you configure channel A as a remote I/O scanner, you
cannot use the programming terminal on the front of the 1756-DHRIO and
1756-DHRIOXT modules for DH+ access.
Also, throughout this chapter, we show sample configuration dialog boxes
with each example. Configuration information is dependent on your
application needs.