Field device with dynamically adjustable power consumption...

Details Field device with dynamically adjustable power consumption... Field device with dynamically adjustable power consumption...

Category

G - Physics

Subcategory

05

Subsubcategory

B

IPC codes

G05B 19/042 (2006.01)

Type

Patent

Patent number

CA 2602758

Description

A field device (14) for use in an industrial process control or monitoring system (10) includes terminals (56H, 56L) configured to connect to a two-wire process control loop (16) configured to carry data and to provide power. In one embodiment, RF circuitry (22) in the field device (14) is configured for radio frequency communication having variable power consumption. In another embodiment, the RF circuitry (22) is coupled to the field device (14) through a separate digital communication bus (100) . A method of modulating the power of RF communication based upon a process communication signal is also provided.

Cette invention concerne un appareil de terrain (14) conçu pour être utilisé dans un système de commande ou de suivi de processus industriel (10) et comprenant à cet effet des bornes (56H, 56L) configurées pour se connecter à une boucle de commande de processus bifilaire (16) destinée au transport des données et à l'alimentation en courant. Dans un mode de réalisation, un circuit RF (22) dans l'appareil de terrain (14) est configuré pour permettre la communication en radiofréquence avec une consommation d'énergie variable. Dans un autre mode de réalisation, le circuit RF (22) est couplé à l'appareil de terrain (14) par l'intermédiaire d'un bus de communication numérique séparé (100). Cette invention concerne également un procédé permettant de moduler la puissance de la communication RF sur la base d'un signal de communication de processus.

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