Historical data collection and storage design of cross-platform SCADA

Historical data is the real-time data record generated by the operation of equipment in industrial production. Aiming at the problems such as oversize of data, low efficiency in the process of data collection and storage of domestic PLC monitor and control system, a cross-platform, meeting the requirements of industrial production, facilitating the backtracking of problem collection and storage method is proposed. Data is compressed and collected by using the way of key frames and change sets. This design divides multiple memory buffers and uses timestamp change to achieve automatic switching so as to enhance data read and write efficiency. Meanwhile, the signal and slot mechanism of Qt are used to trigger the thread for data storage operation, which implements data collection and storage at the same time. Running on Windows and Linux operating system platforms, both function and performance of the design meet the requirements.