Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 13
Analog I/O Module Operation in the ControlLogix System Chapter 1
Ownership
Every I/O module in the ControlLogix system must be owned by a ControlLogix
controller. This controller performs the following:
• Stores configuration data for every module that it owns.
• Resides in the local or remote chassis in regard to the position of the I/O
module.
• Sends the I/O module configuration data to define the behavior of the
module and begin operation in the control system.
Each ControlLogix I/O module must continuously maintain communication
with its owner to operate normally. Typically, each module in the system has only
one owner. Some Input modules can have multiple owners. Output modules, and
Input modules that have an Output image like the 1756-IF8I and 1756-IRT8I
modules, however, are limited to one owner.
1756-OF8I Redundant Owner
Redundant ownership lets a single controller use redundant adapters to
communicate with a single output or lets two separate controllers coordinate to
control the output.
See Redundant Owners
on page 98.
Configure a Module
You use the I/O configuration portion of the Studio 5000 Logix Designer®
application to configure each I/O module. An I/O module can reside in either of
the following:
•Local chassis - The chassis in which the owner-controller resides.
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