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VI Ejercicio con Formula Node

Module by: Juan Martínez. E-mail the author

Based on: Formula Node Exercise VI by National Instruments

Summary: In this exercise, the objective is to use the Formula Node in a VI. Complete the following steps to build a VI that uses the Formula Node to perform a complex mathematical operation and graphs the results.

Exercise 1

1.a) Panel Frontal

  1. Abrir un VI en blanco y construir el panel frontal mostrado en la figura 1.
    Figura 1
    Figura 1 (formulaexer.png)

1.b) Diagrama de Bloques

  1. Construir el diagrama de bloques mostrado en la figura 2.
    Figura 2
    Figura 2 (formulaexerbd.png)
    1. Colocar en el diagrama de bloques el Formula Node, situado en la paleta Functions>>All Functions>>Structures.
    2. Crear el terminal de entrada x haciendo clic con el botón derecho del ratón sobre el borde izquierdo y seleccionando Add Input en el menú contextual. Escribe x en la caja que aparece.
    3. Crear los terminales de salida y y a haciendo clic con el botón derecho del ratón sobre el borde izquierdo y seleccionando Add Output en el menú contextual. Escribir y y a respectivamente, en las cajas que aparecen. Hay que crear terminales de salida para las variables temporales como aa.

      Nota:

      Cuando se crea un terminal de entrada o de salida, se tiene que usar para la variable el mismo nombre que el que se ha usado en la ecuación. Los nombres de variable son sensibles a mayúsculas y minúsculas.
    4. Escribir las siguientes ecuaciones en el Formula Node, donde ** es el operador exponencial. Consultar la ayuda de LabVIEW para una mayor información sobre la sintaxis de los Formula Node. 
      
		    a = tanh(x) + cos(x);
		    y = a**3 + a;
    5. Completar el diagrama de bloques según se muestra en la figura 2.
  2. Salvar el VI como Ejercicio Formula Node.vi en el directorio C:\Exercises\ LabVIEW Basics I.

1.c) Ejecutar el VI

  1. Mostrar el panel frontal y ejecutar el VI. El gráfico muestra la representación de la ecuación y=f3x+f⁢x y f x 3 f x , donde f⁢x=tanhx+cosx f x x x . Durante cada vuelta del bucle, el VI divide el terminal de contaje entre 15.0. El cociente está unido al Formula Node, que calcula el valor de la función. El instrumento virtual dibuja el array como un gráfico.
  2. Cerrar el VI.

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