Circuito conductor y Los circuitos sensores conectan el mundo analógico de los dispositivos no digitales a las señales de control digitales. Circuito excitador es el nombre genérico de los circuitos que proporcionan voltaje y corriente adecuados a los dispositivos periféricos. Dependiendo del dispositivo, las corrientes y tensiones necesarias a menudo superan la capacidad de salida de cualquier unidad de control digital (DCU). Además, el accionamiento de muchos dispositivos requiere señales de naturaleza analógica, lo que exige algún tipo de estrategia de conversión digital-analógica (DAC). Un circuito sensorial monitoriza la información analógica del mundo real y la convierte en datos digitales adecuados para el procesamiento de la DCU. El Capítulo 9 está dedicado a explorar los sensores y los métodos de circuitos utilizados para soportarlos.
La Figura 8-1 ilustra los conceptos de sensado/accionamiento. Un circuito excitador proporciona alta potencia a un motor y un circuito sensor determina la velocidad de giro del motor. Los dispositivos pueden funcionar sin detección de realimentación (también conocido como bucle abierto), o junto con la realimentación dentro de un sistema de control de bucle cerrado (IED: Control).
Figura 8-1. Sistemas de accionamiento y detección
Este capítulo se centra en los circuitos ...
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