A VxD-based automatic blending system using multithreaded programming

This paper discusses the object-oriented software design for an automatic blending system. By combining the advantages of a programmable logic controller (PLC) and an industrial control PC (ICPC), an automatic blending control system is developed for a chemical plant. The system structure and multit...

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Bibliographic Details
Published in:	ISA transactions 2004, Vol.43 (1), p.99-109
Main Authors:	Wang, L., Jiang, X., Chen, Y., Tan, K.C.
Format:	Article
Language:	eng
Subjects:	Algorithms Applied sciences Automata. Abstract machines. Turing machines Automata. Logic controller Automatic blending system Chemical Industry - instrumentation Chemical Industry - methods Complex Mixtures - chemical synthesis Computer science control theory systems Computing Methodologies Control theory. Systems Equipment Design Equipment Failure Analysis Exact sciences and technology Multithreaded data communication Object orientation Online Systems Programmable logic controller Programming Languages Rheology - instrumentation Rheology - methods Robotics - instrumentation Robotics - methods Software Software engineering Theoretical computing Virtual X device driver
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Summary:	This paper discusses the object-oriented software design for an automatic blending system. By combining the advantages of a programmable logic controller (PLC) and an industrial control PC (ICPC), an automatic blending control system is developed for a chemical plant. The system structure and multithread-based communication approach are first presented in this paper. The overall software design issues, such as system requirements and functionalities, are then discussed in detail. Furthermore, by replacing the conventional dynamic link library (DLL) with virtual X device drivers (VxD's), a practical and cost-effective solution is provided to improve the robustness of the Windows platform-based automatic blending system in small- and medium-sized plants.
ISSN:	0019-0578 1879-2022