La creación de un OPC viene dada por dominar los siguientes conceptos:
Aguas abajo: lectura hacia el bus de campo o red de control.
- Canal o Channel: es el protocolo que vamos a leer aguas abajo del OPC. Este protocolo entiéndase como DeviceNet, EthernetIP, Modbus Plus, cualquier protocolo de control MENOS OPC.
El protocolo OPC es a nivel de Sistema Operativo para la intercomunicación de software de supervisión o similares
- Dispositivo o Device: es el equipo que queremos leer en el canal configurado. Este equipo puede ser un PLC, una RTU, un bridge de protocolos, etc.
Aguas arriba también es diferenciar:
- OPC Server: es quien provee la lectura desde la red de control o bus de campo y la deja disponible para que alguien les consulte en OPC.
- OPC Client: se conectan al servidor OPC para solicitar información. Los clientes solicitan la información por protocolo OPC, y en ningún caso directamente hacia los dispositivos de control. Esta labor la realiza el servidor OPC.
Ejemplo:
InTouch necesita conectarse a un bus de campo no soportado y para ello se instalo en un servidor de comunicaciones Kepserver con dicho protocolo. Cómo entonces hacemos conversar InTouch con Kepserver?
InTouch se conecta como cliente OPC con su software FSGateway mientras que Kepserver actúa como servidor OPC proporcionando toda la información que le solicite InTouch.
Teniendo eso en cuenta lo que viene es la configuración del OPC. Eso es motivo de otro post.
Puedo hacer configuración de los OPC TopServer y Kepserver. Cual les gustaría que abordara primero?
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