Allen-Bradley 1756-L61 ControlLogix 5561 Programming Manual page 12

Chapter 1 Communicate with I/O Modules
Owner controller
Listen-only connection
Table 1 - Choose the Type of Ownership
If module is And another controller
Input module Does not own the module
Owns the module
Output module Does not own the module
Owns the module
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When you choose a communication format, you have to choose whether to
establish an owner or listen-only relationship with the module.
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.
An owner connection is any
connection that does not include
Listen-Only
in its Comm Format.
An I/O connection where another controller owns/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 only maintain a
connection to the I/O module when the owner controller is actively controlling the I/O module.
Listen-only Connection
Use the following table to choose the type of ownership for a module.
And you want to
Maintain communication with the module if it loses
communication with the other controller
Stop communication with the module if it loses
communication with the other controller
There is a noted difference in controlling input modules versus controlling
output modules.
Rockwell Automation Publication 1756-PM004D-EN-P - September 2012
Then use this type of connection
Owner (not listen-only)
Owner (not listen-only)
Use the same configuration as the other owner
controller.
Listen-only
Owner (such as, not listen-only)
Listen-only