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

Inactive Publication Date: 2009-04-29
SHANGHAI BAOSIGHT SOFTWARE CO LTD
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  • Claims
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Problems solved by technology

In addition, when the time of the historical data acquisition system changes suddenly, it will also cause data loss
like image 3 As shown, when the first data collection is performed at the 10th second, the system time is suddenly modified backwards to 54 seconds, and the sampling data at the 20th, 30th, 40th, and 50th seconds will be lost

Method used

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  • History data acquisition method for monitoring system
  • History data acquisition method for monitoring system
  • History data acquisition method for monitoring system

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Embodiment Construction

[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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Abstract

The invention discloses a historical data collecting method applicable to a monitoring system. The collecting method comprises that a timer is used to periodically motivate a historical data collecting process according to the minimum sampling circle of the historical data; for a data point arrived the sampling circle, a real-time data accessing interface is called to obtain a real-time value as the historical data to be stored; after storing the historical data to a historical data library, the historical data collecting system adjusts time interval between two data processes according to the time movements needed in the historical data collecting process. The method can reduce sampling time delays caused by timer error and program execution, thereby improving precision of the sampling time. Furthermore, the method can automatically carrying out point compensation to adapt to sudden time change of the operation system too. Therefore, the method is applicable to historical tendency data collections in various technical fields, including intelligent building, rail transit, tunnel, mine, petrochemical industry and the like.

Description

technical field [0001] The invention relates to a method for collecting historical data of data points, in particular to a method for collecting historical data of data points that can be used in monitoring systems in multiple technical fields such as intelligent buildings, rail transit, tunnels, coal mines, and petrochemicals. Background technique [0002] The monitoring system requires the collection of historical data of certain data points, so that the historical data can be displayed and analyzed according to parameters such as start time, end time, and data sampling interval when needed. like figure 1 As shown, in the past, when the sampling period of a batch of data points required for historical data collection arrives, the collection and storage of these data by the historical data collection system will form a performance peak. At the same time, because the process of data collection and storage itself takes a certain amount of time, it will have a certain impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/048
Inventor 蔡春雷徐利再范昀
Owner SHANGHAI BAOSIGHT SOFTWARE CO LTD
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