User manual

Publication CNET-UM001C-EN-P - November 2005
4-8 Control I/O
Ownership
In a Logix5000 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.
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.
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 only 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