JPH10143543A - Time sequential data preservation device and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save preservation resources and to save time required for the write and read processings of data by controlling the preservation of the data corresponding to the change amount of time sequential data. SOLUTION: When a data read part 21 reads the data outputted by the respective kinds of measurement devices 1a-1d in a fixed cycle, a data temporary preservation part 22 temporarily preserves the read new data, the data one before and a counter value at the present point of time, etc. A change amount calculation part 23 reads the previous data for comparison and the data of this time from the data temporary preservation part 22 and calculates the difference of each other. A change amount comparison part 24 compares the value of a calculated deviation and the reference value of the change amount set beforehand and judges size and a data preservation interval control part 25 preserves the data and the counter value to a data preservation part 26 when the value of the deviation is larger than the reference value as the compared result of the comparison part 24. Thus, when the change amount of the data is small, a preservation interval is prolonged and the preservation resources are saved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-series data storage device and a recording medium used in, for example, a sewage treatment plant.

[0002]

2. Description of the Related Art In a sewage treatment plant, for example, a flow meter for measuring a flow rate of sewage flowing into the plant, a water level meter for measuring a water level of a pond (sedimentation pond) for storing sewage, and a thermometer for measuring the temperature thereof Instruments that inspect and analyze the quality of sewage water are used. Time-series data storage devices store and save data (process data) obtained from each measuring device, and process data is used for plant control and It is useful for monitoring.

[0003] Since a sewage treatment plant is normally operated for 24 hours without stopping, enormous amount of process data is obtained from various measuring instruments. For this reason,
Magneto-optical disk devices, magnetic tapes, and the like as storage resources (data storage units) of the time-series data storage device also have a large storage capacity.

[0004] In most cases, this type of process data changes only slightly over a long period of time. However, in the sense of monitoring, data obtained from all instruments is stored so that each change can be understood. Need to be kept.

[0005]

As described above, in the conventional time-series data storage device described above, it is necessary to store all data in a time-series even if the data has only a small change in a long time. For this reason, there is a problem that it is necessary to use a large-capacity data storage means and resources cannot be saved.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a time-series data storage device and a recording medium that can save resources.

[0007]

In order to achieve the above-mentioned object, a time-series data storage device according to the first aspect of the present invention is provided with a data-generating apparatus which captures data generated by a data source as time-series data at predetermined time intervals. Capturing means, temporary storage means for temporarily storing the time-series data captured by the capturing means, change amount calculation means for reading the previous and current time-series data from the temporary storage means to determine the change amount, Control means for determining whether to save the time-series data stored in the temporary storage means according to the amount of change obtained by the change-amount calculating means; and the time-series data permitted to be stored by the control means And a storage means for storing

According to a second aspect of the present invention, there is provided the time-series data storage device according to the first aspect.
The control unit includes a change amount comparison unit that compares the change amount obtained by the change amount calculation unit with a preset reference value, and a comparison result obtained by the change amount comparison unit. A data storage interval control unit that stores the time-series data in the temporary storage unit in the storage unit only when the value exceeds the value range.

The time-series data storage device according to the third aspect of the present invention is the time-series data storage device according to the second aspect,
The data storage interval control unit does not store the time-series data of the change amount within the range of the preset reference value, and adds a new sampling number to the previous data.

According to a fourth aspect of the present invention, there is provided the time-series data storage device according to the second aspect.
The data storage interval control unit, when the change amount exceeds the range of the reference value, the data up to the previous time temporarily stored in the temporary storage means up to that time until the data has been continuous within the reference range It is characterized in that it is stored in the storage means together with the number of times. .

According to a fifth aspect of the present invention, in the time series data storage device according to any one of the first to fourth aspects, the data generation source measures data that requires monitoring and control for 24 hours. It is characterized by being a device that performs.

According to a sixth aspect of the present invention, there is provided a recording medium wherein data generated by a data source is captured as time-series data at predetermined time intervals and temporarily stored in temporary storage means. Read the time series data of
Determine the mutual change amount based on the read time-series data, determine whether to save the time-series data temporarily stored in the temporary storage means to the storage means according to the obtained change amount,
A program for causing a computer to execute a process of storing the time-series data determined to be stored in the storage unit is recorded.

That is, according to the present invention, time-series data is read at predetermined time intervals, the read data is temporarily stored, the amount of change between the previous time and this time is obtained, and the data is stored based on the amount of change. Since the control is performed to change the interval at which data is stored in the data storage unit, when the amount of change in the data is small, the data storage interval becomes longer, thereby saving storage resources more than before. When the data storage interval is long, the time required for data write and read processing can be saved, and resources can be saved both in storage area and time.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a variable-density data storage device according to one embodiment of the time-series data storage device of the present invention.

In FIG. 1, reference numeral 1 denotes a data source.
The data generation source 1 is a water level meter 1a installed in a sedimentation basin for storing sewage treated in a sewage treatment plant, and constantly measuring the height (water level) of the water accumulated in the sedimentation basin. In the sewage treatment plant, as a data source 1 other than the water level meter 1a, for example, a flow meter 1b, a thermometer 1c,
A water quality analyzer 1d and the like are also installed. Reference numeral 2 denotes a computer, which is installed in a building having a sewage treatment plant and performs calculations for controlling each control device (pump, valve, etc.) related to sewage treatment. 3 is a data transmission means,
This is for transmitting data from the data source 1 to the computer 2, such as an RS232C cable or Ethernet.
(Communication network), MAP (Manufacturing Automation Proto
col: industrial LAN).

The computer 2 includes a data reading unit 21, a data temporary storage unit 22, a change amount calculation unit 23, a change amount comparison unit 24,
It has a data storage interval control unit 25, a data storage unit 26, and the like. The data reading unit 21 reads the results (data) output from the various measuring instruments at regular intervals (at fixed time intervals) and attaches a time stamp to the data as process data. is there.
The data temporary storage unit 22 temporarily stores the new data read by the data reading unit 21, the previous data for comparison, the current counter value, and the like, and is, for example, a buffer memory. The change amount calculation unit 23 reads the previous comparison data and the current data from the data temporary storage unit 22 (buffer memory), and calculates the difference between them. The change amount comparison unit 24 compares the value of the deviation calculated by the change amount calculation unit 23 with a preset reference value of the change amount to determine whether the difference is within the reference range or outside the reference range. The data storage interval control unit 25 has a counter 25a therein, determines whether or not to store data based on the comparison result of the change amount comparison unit 24, and clears or increments the counter 25a. For example, the change amount comparison unit 2
As a result of the comparison in 4, if the deviation value is larger than the reference value, the data in the data temporary storage unit 22 and the count value of the counter 25a are stored in the data storage unit 26. Data storage unit 2
Reference numeral 6 denotes a device capable of storing a large amount of data, such as a magneto-optical disk device, a hard disk device, and a magnetic tape device. (The storage capacity may be smaller than the conventional one.) The operation of this variable density data storage device will be described below with reference to FIGS. 2 is a diagram showing a flow of data in the computer, FIG. 3 is a flowchart showing a processing procedure of the computer, FIG. 4 is a diagram showing input data and collected data,
FIG. 5 is a diagram showing one pattern in which the density of collected data is changed and stored, and FIG. 6 is a diagram showing the contents of data to be stored. FIG. 7 is a diagram showing a comparative example of the variable density data storage device and a conventional device. FIG. 8 is a diagram for specifically explaining the effect of the variable density data storage device.

In the case of this variable-density data storage device, as shown in FIGS. 2 and 4, measurement data P (input time-series data P) which is an analog signal from the water level gauge 1a of the sewage treatment plant through the data transmission means 3. Is input to the computer 2, the input time-series data P is read by the data reading unit 21 at equal time intervals (step 101 in FIG. 3).
It becomes collected time-series data Q (bar-shaped data) and is temporarily stored in the data temporary storage unit 22. In the change amount comparing section 24, an A pattern having a long sampling time interval and a B pattern having a short time interval are set in advance. One of the time intervals of the A pattern and the B pattern, for example, the B pattern is used. Data Q
Are stored in the data temporary storage unit 22 at the time interval of the B pattern, the change amount calculation unit 23
Then, the signal intensity (height direction) of the current data Q and the previous comparison data Q-1 are compared to obtain a mutual deviation (step 102).

Subsequently, the change amount comparison unit 24 compares the value of the deviation calculated by the change amount calculation unit 23 with a preset reference signal intensity value (reference value) of the change amount of the deviation. It is determined whether or not the value of the deviation is within the range of the set reference value (step 103).

The data storage interval control unit 25 determines whether to store the data Q in the data storage unit 26 based on the comparison result of the change amount comparison unit 24.

Here, for example, if the difference value is within the range of the reference value of the pattern A (yes in step 103), the data storage interval control unit 25 determines that data is not stored (step 104). One is added (incremented) to the count value of the counter 25a (step 105), and only the count value is stored in the data temporary storage unit 22 to wait for the next sampling timing.

On the other hand, if the deviation exceeds the range of the reference value (no in step 103), the data Q-1 stored in the data temporary storage unit 22 up to the previous time and the counter 25a in the sampling up to that time are used. The added current count value, that is, the number of consecutive times that the deviation was within the range of the reference value, is stored in the data storage unit 26 (step 106).

After storing the data, the data storage interval control unit 25
Resets the count value of the counter 25a, that is, stores the count value 1 together with the current data Q in the data temporary storage unit 22.

As a result, as shown in FIG. 5, in the case of the pattern C or the like in which the reference value is set small, the data is stored in the data storage unit 26 at small intervals, and the recording density becomes close to the sampled data.

On the other hand, for example, in the case of the pattern D in which the reference value is set large, the data is stored in the data storage unit 26 at roughly intervals, and the recording density is reduced accordingly.

As shown in FIG. 6, the data temporary storage 22
The data to be temporarily stored include the data sampled this time, the comparison data, and the count value of the counter 25a. The contents of the file stored in the data storage unit 26 include the stored data and the stored data This is the data of the number of times indicating whether the operation has been performed.

As a specific example of a file stored in the data storage unit 26, as shown in FIG. 7 (a), for example, when the signal strength 11.1 is continuous nine times and the signal strength 9.2 is continuous twice, FIG. As shown in FIG. 7 (b), the data storage unit 26 stores the signal strength 11.1 and the number 9 below it, the signal strength 9.2 below it, and the number 2 below it.

In the prior art, as shown in FIG. 7C, nine signal intensities 11.1 are stored, and the signal intensity 9.1 is stored below them.
2 are saved.

As described above, according to the variable-density data storage device, the time-series data is stored at an appropriate storage density within a range where there is no problem in recording accuracy, so that the data storage area and the data storage The resources of the computer 2 can be saved in both time required for reading and writing data.

Here, specific effects will be described with reference to an example.

For example, consider a sine wave having a frequency of 1/72 and an amplitude of 1 as time series data from the data source 1.

Then, the sampling period of the computer 2 is set to 1
If it is seconds, 72 points can be sampled in one sine wave cycle.

In this case, in the conventional technique, as shown in FIG. 8A, all 72 sampled points are unconditionally stored in the data storage unit. The storage area required for this storage requires 8 × 72 = 576 bytes as a double precision decimal.

The sine wave of this example is relatively large at a maximum of 0.087 near 0, 36, and 72 seconds.
At around 54 seconds, the change is as small as 0.0039.

Therefore, in the case of the present invention, taking the above change into consideration, for example, if the reference value of the deviation is set to 0.045 or the like,
Since the data whose change amount is smaller than 0.045 is not stored, the time interval of the data stored in the data storage unit 26 is widened as shown in FIG.
= 400 bytes.

The value of the integer type (short type) counter 25a to be added thereto is 2 × 50 = 100 bytes, and the storage area necessary for storage in this apparatus is 400 + 100 = 500 bytes in total.
Becomes Therefore, compared to the conventional 576 bytes,
Saving 500 = 76 bytes.

The time required for writing and reading data is proportional to the area required for storing data, so that 500/576 × 100 = 86.8% can be saved. If the reference value of the deviation is set to a value larger than 0.045, the storage area and time can be further saved.

The present invention is not limited only to the above embodiment.

For example, each unit (the data reading unit 21, the data temporary storage unit 22, the change amount calculation unit 23, the change amount comparison unit 24, the data storage interval control unit 25, and the data storage unit 26) which constitute the computer 2 shown in FIG. ) Are programmed and written in advance in a recording medium such as a CD-ROM 50 as shown in FIG.
Is mounted on the computer 51 equipped with a CD-ROM drive, and the computer 51 loads a program from the CD-ROM 50, thereby realizing the same function as the above embodiment. The recording medium is the CD-RO described above.
Other than the M50, a magnetic tape, a DVD-ROM, a floppy disk, an MO, an MD, a CD-R, a memory card, or the like may be used.

When the above functions (processes) are programmed, the present invention is not limited to the form of the CD-ROM 50 and the like, but there are also means for realizing the above functions.

For example, the present invention can be realized by loading the program from a computer or the like recorded on a hard disk or the like to another computer via a public line network or a LAN.
In addition to data communication networks such as public line networks and LANs,
It is also conceivable to send and receive the above program by wireless communication.

[0042]

As described above, according to the present invention, the storage of time-series data is controlled in accordance with the amount of change in time-series data, that is, by changing the data storage interval, the amount of change in data is small. Can save resources more than before. Also, the time required for data writing and reading processing can be saved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a variable density data storage device according to one embodiment of the present invention.

FIG. 2 is a diagram showing a data flow in a computer of the variable density data storage device.

FIG. 3 is a flowchart illustrating a processing procedure of a computer.

FIG. 4 is a diagram showing input data and collected data.

FIG. 5 is a diagram showing patterns C and D in which the density of collected data is changed and stored.

FIG. 6 is a diagram showing contents stored in a data temporary storage unit 22 and a data storage unit 26;

FIG. 7A is a diagram illustrating an example of sampled time-series data. FIG. 3B is a diagram illustrating data stored in a data storage unit according to the present embodiment. (C) is a diagram showing data stored in a conventional data storage unit.

FIG. 8A is a diagram showing stored data in the related art.
FIG. 2B is a diagram illustrating stored data according to the embodiment.

FIG. 9 is a diagram showing a configuration example of a recording medium of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Data source, 2 ... Computer, 3 ... Data transmission means,
21: Data reading unit, 22: Data temporary storage unit, 23:
Change amount calculation unit, 24: change amount comparison unit, 25: data storage interval control unit, 26: data storage unit.

Claims (6)

[Claims] An input unit for inputting data generated by a data source as time-series data at predetermined time intervals; a temporary storage unit for temporarily storing the time-series data input by the input unit; Change amount calculating means for reading the previous and current time-series data from the temporary storage means to obtain a change amount; and time-series data temporarily stored in the temporary storage means according to the change amount obtained by the change amount calculating means. A time-series data storage device, comprising: control means for determining whether to store the time-series data; and storage means for storing the time-series data permitted to be stored by the control means. 2. The time-series data storage device according to claim 1, wherein the control unit includes a change amount comparison unit that compares the change amount obtained by the change amount calculation unit with a preset reference value. A data storage interval control unit that stores the time-series data of the temporary storage unit in the storage unit only when the change amount exceeds the range of the reference value as a result of the comparison by the change amount comparison unit. A time-series data storage device characterized by the above-mentioned. 3. The time-series data storage device according to claim 2, wherein the data storage interval control unit does not store the time-series data of the change amount within a range of a preset reference value, and stores the time-series data of the previous time. A time-series data storage device, characterized by adding a new number of samplings to the data. 4. The time-series data storage device according to claim 2, wherein the data storage interval control unit, when the change amount exceeds a range of a reference value, stores the last time stored in the temporary storage unit up to that time. A time-series data storage device for storing the data up to and including the number of times the data has continued in the reference range. 5. The time-series data storage device according to claim 1, wherein the data generation source is a device that measures data requiring monitoring and control for 24 hours. Storage device. 6. The data generated by the data source is captured as time-series data at predetermined time intervals, temporarily stored in temporary storage means, and the previous and current time-series data are read out from said temporary storage means and read out. Determine the mutual change amount based on the time-series data, determine whether to save the time-series data of the temporary storage means to the storage means according to the obtained change amount, the time-series data determined to be saved A recording medium on which a program for causing a computer to execute a process of storing in the storage unit is recorded.