20 Rockwell Automation Publication 5000-UM005B-EN-P - November 2015
Chapter 1 Analog I/O Module Operation in a Logix5000 Control System
Listen Only Mode
Any controller in the system can listen to the data from an I/O module. An
owner-controller, as described in
Ownership on page 12, exchanges data with the
analog I/O module.
Other controllers can use a Listen Only connection with the analog I/O module.
In this case, the ‘listening’ controller can only listen to input data or ‘echoed’
output data. The listening controller does not own the module configuration or
exchange other data with the module.
During the I/O configuration process, you can specify a Listen Only connection.
For more information on Connection options when configuring your system, see
Module Definition Parameters on page 89.
Use 5069-ARM and
5069-FPD Modules
The following 5069 modules are available for unique purposes in a 5069
Compact I/O system:
•
5069-ARM Address Reserve Module
•
5069-FPD Field Potential Distributor
IMPORTANT
Remember the following:
• If a controller uses a Listen Only connection, the connection must use
the Multicast option. In this case, all other connections to the module,
for example, the connection to the owner-controller, must also use the
Multicast option.
• If a controller attempts to use a Listen Only connection to a module but
the owner-controller connection uses the Unicast option, the attempt
at a Listen Only connection fails.
The ‘Listen Only’ controller receives data from the module as long as a
connection between an owner-controller and module is maintained
• If the connection between an owner-controller and the module is
broken, the module stops sending data and connections to all ‘Listening
controllers’ are also broken.
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