Abstract
During a period of two years a number of process studies were carried out in a vinyl chloride plant with the aid of a mobile process computer.As a result of these experiments a motivation could be given for the installation of a process information system.This system had to meet the demands of all plant disciplines involved, viz. process operators, production management, and engineering.Therefore, a modular computer network has been designed on the basis of an in-house time sharing system and four front-end processors.The communication between the computers is controlled by means of a real-time supervisory program in the central time sharing computer. Every five minutes a complete set of actual process data is collected.After correction and calculation of more complex variables these data are stored into data files of the time sharing computer. All the authorised time-sharing users have access to the process data files from their own programs written in BASIC.The project was realised in about 10 months and the system has been operational since October, 1974.
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