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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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System integration of a multivariable process plant utilising an intelligent control technique

Naidoo P., Govender D. T. P., van Niekerk T. I.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 31, nr 2

540-546

Purpose: The research objective is to maintain a desired process outlet temperature. Firstly, communication between the control system and the process field devices by means of Profibus-PA and Profibus-DP is established. Secondly the process flow rate and level in the supply vessel must be controlled in the same system. The final manipulated variable, an air-to-open control valve is regulated to achieve the research objective [2]. The paper will discuss introductory aspects of Profibus and simulated results on the knowledge based controller as the research is on-going. Design/methodology/approach: The research project comprises the design, engineering and analysis of a multi input/output rule-based process control system on the Profibus communication platform. A programmable logic controller is configured to control the plant and a Profibus system is used to communicate input and output signals between the field instrumentation and the process control system. Findings: The plant and control knowledge derived for the design of the decision-making control algorithm in the research was obtained from available data in the open-loop mode as the plant is still to be commissioned. The designed algorithm will be tested on the process plant in comparison with the simulated results in order to evaluate its feasibility in a networked control system for temperature, level and flow on a Profibus-DP and Profibus-PA network. A mathematically-based control strategy will contribute to increasing the settling time tremendously thereby impacting negatively on factors like production time and quality. Practical implications: The process control system will monitor and control measured variables such as flow, temperature and level on a typical industrial plant. The plant will be used to transfer technology education and training to industry and practitioners alike. Originality/value: The control strategy emerging from this research may be applied to similar process plants in industry.