Allen-Bradley 1756 ControlLogix - Choose the Type of Ownership for a Module; Ownership

Control I/O
Chapter 4
Rockwell Automation Publication CNET-UM001F-EN-P - February 2018 65
In a Logix 5000 system, modules multicast data. This means that multiple
controllers can receive the same data at the same time from a single module.
When you choose a communication format, you have to choose whether to
establish an owner or listen-only relationship with the module.
Type of Ownership Definition
Owner controller The controller that creates the primary configuration and communication connection to a module. The
owner controller writes configuration data and can establish a connection to the module. The owner
controller is the only device that controls the outputs.
An owner connection is
any connection that does
not include listen-only in
its communication format.
Listen-only
connection
An I/O connection where another controller provides the configuration data for the I/O module. A
controller using a listen-only connection only monitors the module. It does not write configuration data
and can maintain a connection to the I/O module only when the owner controller is actively controlling
the I/O module.
Listen-only Connection.
Table 13 - Module Ownership
Module Type Controller Desired Function Required Connection Type
Input module Does not own the module ---------------------------------> Owner, such as not listen-only
Owns the module Maintain communication with the
module if it loses communication
with the other controller.
Owner, such as not listen-only
Use the same configuration as the
other owner controller.
Ownership
Choose the Type of
Ownership for a Module