JCSE, vol. 2, no. 4, pp.394-411, December, 2008

DOI:

New Control System Aspects for Supporting Complex Data and High Performance System

Dae-Seung Yoo, Vu Van Tan, Myeong-Jae Yi
School of Computer Engineering and IT, University of Ulsan, Korea

Abstract: The data in automation and control systems can be achieved not only from different fielddevices but also from different OPC (OLE for Process Control) servers. However, current OPCclients can only read and decode the simple data from OPC servers. They will have someproblems to acquire structured data and exchange the structured data. In addition to the largenetwork control systems, the OPC clients can read, write, and subscribe to thousands of datapoints from/to OPC servers. Due to that, the most important factor for building a highperformance and scalable industrial control system is the ability to transfer the process databetween server and client in the most efficient and fastest way. In order to solve these problems,we propose a means to implement the OPC DA (Data Access) server supporting the OPCcomplex data, so that the OPC DA clients are able to read and decode any type of data fromOPC servers. We also propose a method for caching the process data in large industrial controlsystems to overcome the limitation of performance of the pure OPC DA system. Theperformance analysis and discussion indicate that the proposed system has an acceptableperformance and is feasible in order for applying to real-time industrial systems today.

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