Allen-Bradley 1738-ADNX Manual de usuario descargar pdf (Pagina 58)

Publication 1768-UM001C-EN-P - November 2007

58 Configure and Monitor I/O

I/O Connections

A Logix5000 system uses connections to transmit I/O data.

Logix5000 Connection Types

Connection Description

Direct

(applies to all 1769 I/O)

A direct connection is a real-time, data-transfer link between

the controller and an I/O module. The controller maintains

and monitors the connection between the controller and the

I/O module. Any break in the connection, such as a module

fault or the removal of a module while under power, causes

the controller to set fault status bits in the data area

associated with the module.

Typically, analog I/O modules, diagnostic I/O modules, and

specialty modules require direct connections.

Rack-optimized

(applies to distributed I/O)

For digital I/O modules, you can select rack-optimized

communication. A rack-optimized connection consolidates

connection usage between the controller and all of the

digital I/O modules on a rack (or DIN rail). Rather than having

individual, direct connections for each I/O module, there is

one connection for the entire rack (or DIN rail).

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Allen-Bradley 1738-ADNX Manual de usuario Pagina 58