Rockwell Automation Allen-Bradley ControlNet 1734-ACNR User Manual page 65

If The Module Is An And Another Controller
Input Module Does not own the module
Owns the module
Output Module Does not own the module
Owns the module
Controlling This Ownership
Input Modules Owner
Listen-only
Output Modules Owner
Listen-only
Choose the Type of Ownership for a Module
Table 4.5 Choose the Type of Module Ownership
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
Table 4.6 Module Ownership Control
Description
The controller that establishes an owner connection to an input module configures that
module. This configuring controller is the first controller to establish an owner connection.
Once a controller owns and configures an input module, other controllers can establish
owner connections to that module. This lets additional owners to continue to receive
multicasted data if the original owner-controller's connection to the module breaks. All other
additional owners must have the identical configuration data and identical communication
format that the original owner controller has, otherwise the connection attempt is rejected.
Once a controller owns and configures an input module, other controllers can establish a
listen-only connection to that module. These controllers can receive multicast data while
another controller owns the module. If all owner controllers break their connections to the
input module, all controllers with listen-only connections no longer receive multicast data.
The controller that establishes an owner connection to an output module configures that
module. Only one owner connection is allowed for an output module. If another controller
attempts to establish an owner connection, the connection attempt is rejected.
Once a controller owns and configures an output module, other controllers can establish
listen-only connections to that module. These controllers can receive multicast data while
another controller owns the module. If the owner controller breaks its connection to the
output module, all controllers with listen-only connections no longer receive multicast data.
Control I/O
Then Use This Type of Connection
Owner, such as: not listen-only
Owner, such as: not listen-only
Use the same configuration as the other
owner controller.
Listen-only
Owner, such as: not listen-only
Listen-only
Publication CNET-UM001C-EN-P - November 2005
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