History data acquisition method for monitoring system
A technology of historical data and collection methods, applied in general control systems, control/regulation systems, program control, etc., can solve problems such as data loss and sampling data loss, achieve reliable data, ensure accuracy, and facilitate locating abnormal data points Effect
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[0018] In order to realize the storage of historical data of data points, it is first necessary to define the historical data sampling period of data points and the minimum sampling time of the timer. The minimum sampling time is shorter than the historical data sampling period of all data points.
[0019] see Figure 8 As shown in , the timer sends regular notifications to the historical data acquisition system periodically according to the minimum sampling time to stimulate the historical data acquisition system. The historical data acquisition system judges in turn whether all data points have reached the historical data sampling time, and if it reaches the sampling time, the real-time data acquisition system is called to obtain the current value of the data point (real-time data) as historical data and stored in the historical data file library. In this way, the historical data collection system can automatically adjust the phase of data points in the same sampling period...
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