Development Of The Temperature Collection And Control Node Based On LONWORKS Field Bus Technology

Fieldbus technology is one of the hottest development of today's control area, It promotes fast development of modern enterprise network technology, brings new vitality and effectiveness to enterprises, therefore it has been widely used. Temperature is one of the most important parameters of industrial production, especially in the fermentation and chemical industry,temperature controlling takes a long time according to a certain temperature curve, temperature automatic controlling has become one of the important measures of the safe production and reduce the loss. Because the substations of monitors are scattered, if using traditional method, the cyele is long and the cost is high, moreover, the survey crew must be measured to the local Point, so efficiency is very low, produce large errors, and can't do real-time monitoring, not eonvenient to manage, not adapt to modern production. Based on the Platform of LonWorks, the temperature collection and control system can achieve the request well, using the platform of LonWorks, through the periphery circuit and the upper control interface, achieve real-time collection of temperature. Through the LonWorks network communication, realizes the functions of data transmission, memory and real-time monitoring, fast diagnosis and so on, it is an intelligent and highly effective system in automatic monitor. Satisfy the temperature requirements to modern production.This thesis use openness, interoperability and other features of Lonworks bus to design and develop the temperature collection and control node. The node is based on the chip, the control module is consisted by Neuron chip TMPN3150B1AF and twisted pair transceiver FTT-10A. the periphery circuit is consisted by temperature collection circuit, A/D conversion circuit, D/A conversion circuit and power circuit, its main effect is to realize collection and control of temperature, and provides power to the nodes of the entire temperature acquisition and control system. Then, respcetively carries on the introduction in view of the temperature system from the hardware and the software, in the hardware aspcet is the LonWorks control module and the periphery cireuit design, in the software aspect is mainly aims at data sample and date control. Then introduce the design of LonWorks network, including PCLTA adapter, network integration tools——LonMaker, network software tools——LNS DDE Server and the Dynamic Data Exchange protocol, finally, introduce the testing and validation of network.