User manual

86 Publication ENET-UM001I-EN-P - January 2010
Chapter 6 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.
Types of Module Ownership
Owner controller The controller that creates the primary configuration and communication connection to a module. The owne
r
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 co
nfiguration 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.
Listen-only connection