Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Manual de usuario descargar pdf (Pagina 13)

Communicate with I/O modules Chapter 1

formats. Each format uses a different data structure. The communication format

that you choose also determines:

• Direct or rack-optimized connection on page 13.

• Ownership on page 14.

Direct or rack-optimized connection

The Logix5000 controller uses connections to transmit I/O data. These

connections can be direct connections or rack-optimized connections.

Term Definition

Direct connection 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 with the I/O module. Any break in the connection, such as a module fault or

the removal of a module while under power, sets fault bits in the data area associated with the module.

A direct connection is any connection that does not use the Rack Optimization Comm Format.

Rack-optimized connection For digital I/O modules, you can select rack-optimized communication. A rack-optimized connection consolidates

connection usage between the controller and all the digital I/O modules in the chassis (or DIN rail). Rather than having

individual, direct connections for each I/O module, there is one connection for the entire chassis (or DIN rail).

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Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Manual de usuario Pagina 13