Rockwell-automation 25B PowerFlex 525 Embedded EtherNet/IP Adapter Manual do Utilizador descarregar pdf (Página 162)

162 Rockwell Automation Publication 520COM-UM001B-EN-E - March 2013

Glossary

Switches Network devices that provide virtual connections that help to control collisions

and reduce traffic on the network. They are able to reduce network congestion by

transmitting packets to an individual port only if they are destined for the

connected device. In a control application, in which real time data access is

critical, network switches may be required in place of hubs.

TCP (Transmission Control Proto-

col)

EtherNet/IP uses this protocol to transfer Explicit Messaging packets using IP.

TCP guarantees delivery of data through the use of retries.

UDP (User Datagram Protocol) EtherNet/IP uses this protocol to transfer I/O packets using IP. UDP provides a

simple, but fast capability to send I/O messaging packets between devices. This

protocol ensures that adapters transmit the most recent data because it does not

use acknowledgements or retries.

UDDT (User-Defined Data Type) A structure data type that you define during the development of an application

(for example, to convert 32-bit REAL parameter data to correctly write and read

their values).

Zero Data When communications are disrupted (for example, a cable is disconnected), the

adapter and drive can respond with zero data. Zero data results in the drive

receiving zero as values for Logic Command, Reference, and Datalink data. If the

drive was running and using the Reference from the adapter, it will stay running

but at zero Reference.

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Rockwell-automation 25B PowerFlex 525 Embedded EtherNet/IP Adapter Manual do Utilizador Página 162