Rockwell-automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual Manual de usuario descargar pdf (Pagina 61)

Publication 1794-UM061A-EN-P - July 2006

Configure Your Adapter and Digital Modules on a ControlNet Network 59

Select a

Communication Format

When you configure a remote ControlNet communications module or an I/O

module, you select a communication format. The communication format you

choose determines the data structure for the tags that are associated with the

module. Many I/O modules support different formats. Each format uses a

different data structure.

The communication format that you choose also determines:

• Direct or rack-optimized connection

• Ownership of outputs

For a remote ControlNet communications module, you must select one of the

formats listed below.

Use this communication format

with a remote ControlNet

communication module:

In these scenarios:

None • All of the remote I/O communicating with a

controller via the remote ControlNet

communication module use a Direct Connection

communication format.

• The connection is used for scheduled

peer interlocking.

• When I/O will be predominately direct

connections.

• When multiple controllers control the outputs in

the chassis

Rack optimized • Some or all of the remote I/O communicating

with a controller via the remote ControlNet

communication module use a Rack Optimized

communication format.

• To minimize ControlNet bandwidth when using

large volume of digital I/O.

• If only one controller will control the I/O.

Rack optimized - Listen only • Some or all of the remote I/O communicating

with a controller via the remote ControlNet

communication module use a Rack Optimized

communication format.

• The connection is going to read inputs but is not

going to be controlling outputs.

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Rockwell-automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual Manual de usuario Pagina 61