Publication: DESARROLLO DE UN MÓDULO DE COMUNICACIÓN FIELDBUS HART ESCLAVO PARA SENSORESINDUSTRIALES
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Date
2017
Authors
RAMIREZ PUSCHEL, CRISTOBAL MARCELO
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Abstract
El objetivo de este trabajo es contar con un prototipo de módulo de comunicaciónHART para sensores industriales. El sensor se conecta por cable USB al módulo de comunicación.Se entrega una biblioteca desarrollada en lenguaje C++ para sistemas Linux.Para el desarrollo del módulo de comunicación se siguieron las hojas de especificacionesHART. Estas especificaciones indican un modelo OSI conformado por capa física, capade enlace de datos y capa de aplicación. El protocolo especifica las funciones de cada unade estas capas y nombra servicios para acceder a cada una de ellas. Con este mecanismoes que cada capa puede comunicarse con la capa inferior.Se utilizó un modem HART comercial para la modulación y demodulación de la señalfísica sobre el lazo de corriente 4 - 20[mA]. Se desarrolló un firmware cumpliendo conel diseño de capas especificado por HART. El microcontrolador se conectó por UARTal modem HART y por USB al computador con sistema Linux que tiene los datos delsensor.Se probó el funcionamiento del módulo de comunicación HART con dispositivo HARTcomercial que actúa como maestro en la red HART y un programa que emplea la bibliotecadesarrollada. No se pudo obtener comunicación de extremo a extremo por fallade modem HART. De todas maneras, por el software empleado por el adaptador USBHARTse observa que las demás capas son compatibles entre el dispositivo comercial yel desarrollo presente en este trabajo.
The objective of this work is to have a prototype of a HART communication modulefor industrial sensors. The sensor is connected via USB cable to the communicationmodule. It is provide a library developed in C++ to be used in Linux systems to communicateto the HART module.The HART specification were used to develop the communication module. Thesespecifications indicate an OSI model composed only of a physical layer, a data link layerand a application layer. The protocol specifies the functions of each of these layers andthe services to access each of them. With this mechanism each layer can communicatewith the lower one.A commercial HART modem was used for the modulation and demodulation of the physicalsignal over the 4-20[mA] current loop. A firmware was developed that implementsthe layer specified by HART. It was burned to a microcontroller. This microcontrollerwas connected by UART to the HART modem and via USB to the computer with Linuxsystem that has the sensor data.The operation of the HART communication module with a commercial HART devicethat acts as master and a program that uses the developed library was tested. Theend-to-end communication from HART modem failed. However, the software used bythe commercial HART device shows that the other layers are compatible between thecommercial device and the development presented in this work.
The objective of this work is to have a prototype of a HART communication modulefor industrial sensors. The sensor is connected via USB cable to the communicationmodule. It is provide a library developed in C++ to be used in Linux systems to communicateto the HART module.The HART specification were used to develop the communication module. Thesespecifications indicate an OSI model composed only of a physical layer, a data link layerand a application layer. The protocol specifies the functions of each of these layers andthe services to access each of them. With this mechanism each layer can communicatewith the lower one.A commercial HART modem was used for the modulation and demodulation of the physicalsignal over the 4-20[mA] current loop. A firmware was developed that implementsthe layer specified by HART. It was burned to a microcontroller. This microcontrollerwas connected by UART to the HART modem and via USB to the computer with Linuxsystem that has the sensor data.The operation of the HART communication module with a commercial HART devicethat acts as master and a program that uses the developed library was tested. Theend-to-end communication from HART modem failed. However, the software used bythe commercial HART device shows that the other layers are compatible between thecommercial device and the development presented in this work.
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Keywords
FIELDBUS , MODULO DE COMUNICACION HART , SENSORES INDUSTRIALES