NI-XNET CAN

Introducción a NI CAN y NI-XNET CAN

Prueba de los puertos del PXI-8512
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Contenido
Introducción ................................................................................................ 4
Requerimientos ............................................................................................ 5
Software ............................................................................................. 5
Hardware ............................................................................................ 5
Prueba del funcionamiento de los puertos del PXI 8512 .......................................... 6
Ejercicio 1. .......................................................................................... 6
Referencias ................................................................................................ 11
Introducción
National Instruments proporciona la primera interfaz industrial CAN seleccionable por
software que contiene un transceptor de alta velocidad y de baja velocidad/tolerante a fallas
y de un solo cable en la tarjeta, por cada puerto y en el mismo dispositivo. Esto quiere decir
que usted simplemente selecciona por software el modo que desea utilizar.

CAN es una red duradera y económica que permite a varios dispositivos comunicarse
entre sí. Un beneficio es que permite a las unidades de control electrónico (ECUs) tener una
sola interfaz CAN (ver Figura 1), en lugar de diferentes entradas analógicas y digitales para
cada dispositivo en el sistema. Reduciendo costos y pesos.

Figura 1. ECUs

CAN fue creado en un principio para uso automotriz, sin embargo, conforme otras industrias
han observado las ventajas de CAN, han adoptado al bus para una amplia variedad de
aplicaciones. Por ejemplo en aplicaciones ferroviarias, aviación, aeroespaciales y en equipo
médico.

La plataforma NI-XNET combina una serie de interfaces CAN, LIN y FlexRay de alto
rendimiento.

La interfaz NI-XNET ofrece el rendimiento asociado con programación de microcontroladores

de bajo nivel y la velocidad y la potencia de Windows y el desarrollo del SO LabVIEW Real-Time.
El motor de patente pendiente NI-XNET guiado por dispositivo DMA reduce la latencia del
sistema, un punto común para interfaces CAN basadas en PC, desde miles de segundos y
microsegundos. El motor habilita el procesador interno para mover marcos y señales CAN entre
la interfaz y el programa de usuario sin interrupciones en el CPU, liberando el tiempo del
procesador principal para procesar modelos y aplicaciones complejos.
Requerimientos
Software
 NI LabVIEW 2012 o superior
 NI-XNET

Hardware
 Controlador embebido
 Sistema PXI Chasis
 NI PXI 8512
 Cable CAN de una sola Terminal
 Mouse
 Teclado
 Monitor
Prueba del funcionamiento de los puertos del
PXI 8512
Ejercicio 1.

Objetivo

 Que el usuario pueda probar su tarjeta NI-XNET para comprobar que los puertos
funcionen correctamente, en este caso usaremos una tarjeta NI PXI-1512.

Introducción

NI PXI-8512 es una interfaz PXI de red de controladores de área (CAN) de alta

velocidad/FD de 2 puertos para desarrollar aplicaciones CAN en NI LabVIEW, NI LabWindows/CVI
y C/C++ en SOs Windows y LabVIEW Real-Time.

Como parte de la plataforma NI-XNET CAN, funciona bien en aplicaciones que requieren
manipulación de alta velocidad en tiempo real de cientos de marcos y señales CAN, como
simulación de hardware en el ciclo, rápida generación de prototipos de control, monitoreo de
bus, control de automatización y más. l

CAN FD es la próxima generación de comunicación CAN de alta velocidad con estándares que
evolucionan para razones de datos más altas. NI ha habilitado velocidades hasta 8 Mbit/s usando
el transceptor TJA1041 a través del controlador NI-XNET.

Figura 2. NI PXI-8512
Desarrollo

Antes de hacer la prueba debemos de asegurarnos de que todo esté conectado correctamente

1. Conecte el monitor, mouse, teclado y fuente de alimentación al Sistema PXI.

2. Coloque la tarjeta NI PXI-8512 en una de las ranuras del chasis, asegúrese de que este
bien colocada.

3. Conecte el cable CAN de una sola terminal a los dos puertos de la tarjeta NI PXI-8512,
debe de asegurarse de que tenga el cable correcto ya que este cuenta con un resistor
integrado en una terminal del cable para simplificar el cableado a dispositivos CAN de
alta velocidad.

Figura 3. Sistema PXI

4. Prenda el Sistema PXI.

5. Abra LabVIEW y seleccione HELP -> Find Examples

Figura 4. Encontrar ejemplos en NI LabVIEW

6. Vaya a la pestaña de buscar y escriba Loopback

Figura 5. Búsqueda CAN Loopback Test

7. Abra el documento CAN Loopback Test.vi

Figura 6. Panel Frontal CAN Loopback Test.vi

8. Diríjase al Diagrama de bloques. Identifique la funcionalidad de cada bloque.

Figura 7.1 Diagrama de Bloques CAN Loopback Test.vi

 Figura 7.2 Diagrama de Bloques CAN Loopback Test.vi

9. Ejecute el programa. Si no está seguro de tener el cable CAN correcto (con el resistor
integrado) en Termination seleccione YES.

Figura 8. Prueba de que los puertos funcionan correctamente

Si el Led se enciende significa que los puertos han pasado la prueba y funcionan de
manera correcta.

FIN DEL EJERCICIO

Referencias

1. NI PXI-8512
http://sine.ni.com/nips/cds/view/p/lang/es/nid/207317

2. Introducción a CAN
http://www.ni.com/white-paper/2732/es/

3. NI-XNET CAN, LIN, and FlexRay Platform Overview

http://www.ni.com/white-paper/9727/en/

4. NI PXIe-1082
http://sine.ni.com/gallery/app/ui/page?nodeId=&mTitle=NI%20PXIe-
1082&mGallery=set_pxie-1082