Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Bedienungsanleitung PDF herunterladen (Seite 14)

Chapter 1 Communicate with I/O modules

Ownership

In a Logix5000 system, modules multicast data. This means that multiple devices

can receive the same data at the same time from a single device.

When you choose a communication format, you have to choose whether to

establish an owner or listen-only relationship with the module.

Term Definition

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.

An owner connection is any connection that does not include Listen-Only in its Comm Format.

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.

Use the following table to choose the type of ownership for a module.

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)

14 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Bedienungsanleitung Seite 14