Introducción
¿Tienes o trabajas en una pequeña / mediana empresa y sigues perdiendo el tiempo haciendo procesos de forma manual? ¿Sabes que, gracias a la automatización industrial, puedes automatizarlos e invertir tu tiempo en otras tareas?
En este post, vamos a mostrarte cómo automatizar estos procesos que aún estabas haciendo manualmente. Vamos a activar y desactivar una salida, analógica o digital, con tiempo personalizable desde el Dashboard de Node-RED, y esta aplicación sólo funcionará si una entrada digital está a 1.
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Requisitos
- Raspberry Pi PLC > o de Panel PC >
- Fuente de Aliementación >
- Alguna válvula, sensor > o actuador para conectar a la entrada o salida.
Node-RED
Vamos a crear nuestra aplicación con Node-RED >, así que lo primero que hay que hacer es descargarlo e instalarlo, ya sea como aplicación o como servicio.
Por defecto en tu PLC o Panel PC Raspberry Pi de código abierto, Node-RED ya viene instalado. Si no lo tienes, descárgalo pinchando
on this link > .
Ejemplo de aplicación
Para que este post sea realmente útil, vamos a ver algunos ejemplos prácticos en los que puedes utilizar los flujos de Node-RED y controlar tu aplicación a través del Dashboard de Node-RED.
Antes de nada, te invitamos a que eches un vistazo a este post, donde podrás ver una lista de hasta
50 industrial applications! >
Ahora, vamos a ver cómo aprovechar este ejemplo de Node-RED flows.json que te proporcionamos para poder controlar tu aplicación a través de un Dashboard.
1. En primer lugar, podríamos conectar una señal de entrada digital como un variador de frecuencia, que si se enciende, activará una válvula ON/OFF que regulará la emisión de líquidos dentro de las botellas durante el tiempo que le digamos. El tiempo de encendido será el tiempo que la válvula dejará pasar el líquido, y el tiempo de apagado será el tiempo que no lo dejará pasar. El líquido se emitirá de forma intermitente. Esta misma aplicación puede ser aplicable a un
labeling system > y a cualquier proyecto que se te ocurra.
TEsta aplicación sería un ejemplo para una entrada automática.
2. Otra aplicación podría ser recibir la señal de un interruptor, y cuando recibimos una señal ALTA, por lo tanto, cuando el interruptor está encendido, activar la salida intermitente, como una luz, alarma, válvula, bomba, motor, turbina, etc.
Este ejemplo sería aplicable como una entrada activada manualmente.
Node-RED flows.json
Una vez que Node-RED esté correctamente instalado, ve al menú > haz clic en Importar > copia este flows.json:
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Y pégalo en los nodos de importación (portapapeles).
Explicación
Una vez importado, deberías ver tu flows.json, algo parecido a la imagen de arriba, que está dividido en varias partes:
1. Creamos un fichero llamado /home/pi/values.json que nos servirá de base de datos de los valores almacenados, de forma que cuando se pare la aplicación y se vuelva a encender, se inicialicen los valores con los últimos establecidos.
2. Inicializamos las variables de T1, T2, active y useInput, asignamos estos valores en variables de flujo.
3. Con las variables de flujo, asignaremos el valor de otra variable en el flujo de ejecución.
4. Si la señal de entrada digital está a 1 y además el pulsador de habilitación está activado, la ejecución debe ser positiva. Y si además, el botón de forzar también está activado, la aplicación debe ejecutarse.
Si, por el contrario, la señal de entrada digital está desactivada pero la fuerza está activada, la aplicación también tiene que funcionar, siempre y cuando el botón de activación esté encendido, de lo contrario la salida debe estar desactivada.
5. Por último, hay un nodo de plantilla en el que se puede modificar el CSS desde el panel de control de Node-RED.
Una vez que toda la aplicación ha tomado su lógica. Puedes cambiar los nodos de write digital output o de read digital input por los analógicos en caso de que tus entradas o de salidas sean analógicas, así como la apariencia y así.
Finalmente, ve a tu Panel de Control y ¡disfruta de tu aplicación!
Tutorial de Node-RED: Proyecto de ejemplo de Node-RED