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Resumen: Zigbee es un estandar que define un conjunto de especificaciones para redes inalambricas de sensores a corta distancia y baja velocidad de transmision. La tecnologia Zigbee tiene a las redes industriales como uno de sus principales objetivos, pero en muchos casos, se requiere la coexistencia con las redes industriales existentes. En este trabajo, se presenta el diseno y construccion de sistema de adquisicion de datos basado en dicha tecnologia. Una pasarela Modbus-Zigbee, basada en microcontrolador, se comunica en una red cableada Modbus con un Controlador logico programable (PLC). El PLC realiza las solicitudes al microcontrolador mediante protocolo de comunicaciones Modbus RTU y el microcontrolador direcciona, mediante comandos AT, un modulo coordinador Zigbee que conforma, a su vez, una red inalambrica con dos modulos remotos transmisores/receptores Zigbee conectados a sensores industriales, uno con salida analogica y otro de tipo digital. La pasarela recibe los datos de los modulos remotos y traduce la informacion al protocolo Modbus para luego ser enviada al PLC. De esta manera, no se requiere modificar los programas del PLC y se preservan los sensores existentes. Abstract: ZigBee is a standard that defines a set of specifications for wireless sensor networks, at short range and low transmission speed. ZigBee technology has industrial networks as one of its primary targets, but in many cases, coexistence with existing industrial networks is required. In this paper, the design and construction of data acquisition system based on this technology is presented. A Modbus-Zigbee based microcontroller gateway communicates on a Modbus wired network with a Programmable Logic Controller (PLC). The PLC makes requests to the microcontroller via Modbus RTU protocol and the microcontroller routes, through AT commands, a Zigbee coordinator module, which in turn creates a wireless network with two remote transmitters/receivers Zigbee modules connected to industrial analog and digital sensors. The gateway receives data from the remote modules and translates the information to the Modbus protocol before being sent to the PLC. Thus, it is not necessary to modify the PLC programs and existing sensors are preserved.

Implementación de Tecnología Zigbee en una Red Modbus para Aplicaciones Inalámbricas en Automatización Industrial