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Vol: 54(68) No: 1 / March 2009 The Practical Sollution of Task Scheduling in a Soft Real Time Unit Dragan Milivojevic Department of Industrial Informatics, Mining and Metallurgy Institute at Bor, Zeleni bulevar 35, 19210 Bor, Serbia, phone: (381) 30 435 -109, e-mail: indinformatika@nadlanu.com Visa Tasic Department of Industrial Informatics, Mining and Metallurgy Institute at Bor, Zeleni bulevar 35, 19210 Bor, Serbia Marijana Pavlov Department of Industrial Informatics, Mining and Metallurgy Institute at Bor, Zeleni bulevar 35, 19210 Bor, Serbia Vladimir Despotovic University of Belgrade, Technical Faculty Bor, Vojske Jugoslavije 12, 19210 Bor, Serbia, phone: (381) 30 424 - 555, e-mail: vdespotovic@tf.bor.ac.yu Keywords: measuring, communication, data acquisition, process control, task scheduling Abstract For the purposes of process control in copper production plants of Mining and Smelting Company - RTB Bor, a special system was developed. The core of that system is Microprocessor Measuring Station – MMS. It is a type of programmable logic controller, with main characteristics of real time units and monitoring and command functions. Hardware and software, as well are fully developed and designed in Mining and Metallurgy Institute Bor. The paper presents a structure of executive and control program with respect to synchronization of the two most important events: measuring and communication. The results of practical implementation are also included. References [1] V. Despotovic, V. Tasic, D. Milivojevic, A. Ignjatovic, ²Power Consumption Control System in Copper Tubes Factory – Majdanpek², Proceedings of XLI International Scientific Conference on Information, Communication and Energy Systems and Technologies ICEST 2006, Sofia, Bulgaria, pp. 403-406, 2006. [2] M68HC11 Reference Manual, Motorola Inc., 1990. [3] Z. Radonjic, Õ-assembler user guide, Nis, 1996 (in Serbian). [4] B. Djordjevic, M. Jevtic, M. Damnjanovic, Digital Real-Time Systems Testing, Charisma, Evidenz und Caritas Ruhr-Universiteat Bochum, Bochum, 1997. [5] D. Milivojevic, V. Tasic, ²MMS in Real Industrial Network², Information Technology and Control, No.3. Vol.36. pp. 318-322, Kaunus, Lythvania, 2007. [6] G. Barney, Intelligent Instrumentation, Microprocessor Applications in Measurement and Control, Prentice Hall, Herefordshire, 1988. [7] D. Karabasevic, V. Tasic, D. Milivojevic, ²SCADA as result of OOP (Universal measuring program)², Proceedings CD of Conference YUINFO\'2004, Kopaonik, Serbia, 2004 (in Serbian). [8] D. Milivojevic, V. Tasic, V. Despotovic, A. Ignjatovic, ²An Example of Influence on Reduction of Electrical Energy Costs², Proceedings of XLI International Scientific Conference on Information, Communication and Energy Systems and Technologies ICEST 2006, pp. 406-409, Sofia, Bulgaria, 2006. [9] D. Milivojevic, V. Tasic, M. Pavlov, V. Despotovic, ²Synthesis of DCS in Copper Metallurgy², Proceedings of XLII International Scientific Conference on Information, Communication and Energy Systems and Technologies ICEST 2007, pp. 629-631, Ohrid, FYR Macedonia, 2007. |