Ningbo Port Liquid Chemical Monitoring System

It is very important to carry on effective control in the chemical tank field to raising management level, reducing the workers' labor intensity, improving working condition, avoiding the accident, etc.In our country, the management to the tank field and quay mainly depended on artificial for a long time, which meant there was no real "monitoring system". By the beginning of the 1990s, as various kinds of new technologies and new methods applied to the field of measuring the tank, the instrument that can automatically measure the liquid location was equipped basically on the tank in every tank field, through which the operator could sit in the control room and make a general survey of the state of all the tank, but the concrete control work still depended on artificial.With the systematic theory of the industrial bus being put forward and the products being under the industrial process control in a large amount, automatic control system and instrument develop towards digitization, intelligent and network(or dispersion), and PROFIBUS bus makes remote control applied to large-scale complicated system nicely. The remote I/O system, whose appearance has solved problems of traditional explosion-proof system, such as high investment of product, low dependence, and complicate application, is used extensively in the field of industry.The field controller based on Profibus technology has really reflected the concept of decentralized control in process automation. Control could be dispersed to each field bus device from geography, unlike the traditional DCS system that all control strategy is made on itself. The field bus control system becomes the direction of control system development, and nowadays, actively exploiting the control system based on field bus and advancing the development of industrial automation becomes the important subject.In this thesis, by analyzing the major type, characteristic and application field of the field bus network system of domestic and international industrial control, analyzing conscientiously to the existing monitoring system situation of tank field of old chemical tank field in the harbor Company of Zhenhai of Ningbo, and...