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