| Real-time industrial control system is one of the hotspot problems of present research, among which production data collection methods and the stability and high effect of production data distribution system are keystones of research. This paper, which is based on Jiangxi Dexing Copper mine's real-time industrial control network, introduces how to build a high-efficient real-time industrial control network and the problems involved such as communication between configuration software and PLC, unexpected errors occurred in the process of data distribution, the performance of its own database is not excellent enough to meet requirements about high speed and efficiency.About communication between configuration software and PLC, it suggests to get serial data through invoking VC function in DLL of Serial Communication in VB program, then realize Inter Process Communication (IPC) with configuration software by sharing memory via DDE protocol integrated with VB. It successfully resolves the communication problem between configuration iFix and old PLC.The paper introduces the method of visiting iFix database by ASP+ADO and distributing data. After a detailed analysis on the causes of 0115 unexpected error occurred in the process of running data distribution system, corresponding resolve methods are brought forward to assure the stable running of data distribution.Due to the imperfect function of iFix database, data inquiry is slow and database can't sustain contemporary visit of multi-consumer. For the sake of carrying out a high-efficient and multi-consumer sustainable data distribution system, this paper suggests to substitute relative database for iFix database, and explains how to transmit locale data to SQL SERVER via data blocks in iFix course database and illuminates how to inquire data efficiently. This method can resolve the imperfectness of data distribution in iFix database and make it more rapid to inquire and distribute data. It is directive for the development of factory MIS system. |
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