Configuration User Manual

56 Rockwell Automation Publication ENET-UM001L-EN-P - March 2014
Chapter 5 Control I/O
Ownership
In a Logix5000 system, modules multicast data. Therefore, multiple modules can
receive the same data at the same time from a single module. When choosing a
communication format, decide whether to establish an owner-controller or
listen-only relationship with the module.
Ownership Type Description
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.
Listen-only connection An I/O connection where another controller owns/provides the configuration data for the I/O module. A controller using a listen-only
connection monitors only the module. It does not write configuration data and can only maintain a connection to the I/O module when the
owner controller is actively controlling the I/O module.
An owner connection is any connection that does
not include Listen-Only in its Comm Format.
Listen-only connection
Table 5 - Choosing a Type of Module Ownership
Module Type Another Controller Desired Conditions Use This Connection Type
Input module Does not own the module Owner
Owns the module Maintain communication with the module if it loses
communication with the other controller
Owner
Use the same configuration as the other owner
controller.
Stop communication with the module if it loses
communication with the other controller
Listen-only
Output module Does not own the module Owner
Owns the module Listen-only