| In the dissertation, designing and realization of the real-time database system of a configuration software applied for the mini-median DCS is discussed. In addition, the dissertation accomplishes work as follows: the basic configuration functions for flow chart is replenished and perfected based on the former this configuration software collectivity frame designs , and the application of Static table-driven scheduling . Accordingly , the development of this configuration software is impelled in the field of opening, integration, network availability, module structure, standardization of communication interface.The designing of the real-time database is the key and the most difficulty part in the configuration software. The real-time database system contains the real-time database and transaction scheduling system. The real-time database system saves the dynamic data produced in the run of system and the various interior information needed for the normal run. Transaction scheduling system is affair schedule center, and the aim of transaction scheduling is to ensure real-time credibility of data in the real-time database and the reliability of run for DCS. The relevant transactions include data sampling, graph display, saving, alarm, and default handling, etc.The scheduling scheme in RTDBS adopts the Static table-driven scheduling assisted with the other scheduling to meet the need of timing limitation of real-time affair. The real-time database system exists as DLL, and the running of RTDBS is realized by using DLL. The real-time database system is saved in the full-range memory owned by Dynamic Linked Library. Read, write requirement and management of real-time database are realized through the interface functions supplied by Dynamic Linked Library. |
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