JPH0528009A - Operational history data processor - Google Patents

Abstract

PURPOSE:To store a large amount of data in the same storing media by conpressing the data to be stored in an operational history data processor by using a data amount reducing process part without degrading data precision. CONSTITUTION:An operational history data processing device 2 receives the transfer data through a data receiving part 8, and at a day-unit file editing process part 9, the data is edited into a day-unit file for each input point, and it is stored in a day-unit file storing part 10. At the stage when the amount of data equivalent to one day is obtained, the data file stored in the day-unit file storing part 10 is processed for preservation by a preserving process part 11, however, before this process, a data amount reducing/converting process part 18 reduces a data table by using a data conversion expression which reduces a data table. When data is displayed by reading the data preserved in a data preserving media 12, the data which is read by a data reading part 15 in response to a read instruction is converted into restored data which includes an original data table by a data restoring/converting process part 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation history data processing device for storing operation data of a plant as operation history data and processing the data such as the operation state and efficiency of the plant.

[0002]

2. Description of the Related Art An operation history data processing device of a power plant or the like receives operation state data from a unit computer that monitors plant operation, saves it as operation history data on a daily basis, and reads out these data for operation. It manages long-term trends such as condition and efficiency, and creates forms such as operation records.

An example of such a device will be described with reference to FIG. The unit computer 1 reads plant data from the plant and monitors and controls the plant. further,
The plant data is transmitted to the operation history data processing device 2. The unit computer 1 reads the state of the plant from the sensor 3. At this time, the analog signal from the sensor 3 is converted into a digital value by the analog / digital converter 4 and read into the unit computer 1. The read data is converted by the unit conversion unit 5 into a value that can be recognized by the operator as a plant state value, and is converted into a value that matches a unit designated in advance for each input point, and is stored in the plant data storage unit 6.

The unit computer 1 uses this data for plant monitoring and also transmits it to the operation history data processing device 2 by the data transmission unit 7.

In the operation history data processing device 2, the transmitted data is received by the data receiving section 8 and is edited by the daily file editing processing section 9 into a daily file for each input point. The data is stored in the daily file storage unit 10. 1
When the daily data is collected, the data file stored in the daily file storage unit 10 is recorded and stored in the large capacity data storage medium 12 such as an optical disk by the storage processing unit 11.

When the data stored in the data storage medium 12 is read and the data is displayed, the search condition setting dialogue section 13 interactively specifies the search condition of the data to be read. As a result, the search command unit 14 issues a read command to the data read unit 15 according to the specified search condition, and the data is read from the data storage medium 12. The read data is stored in the read data storage unit 16, and the data display unit 17 reads and displays this data.

The structure of the data file stored in the data storage medium 12 is shown in FIG. here,
The date of the data to be saved, the data identification name such as the data item name of each input point or the PID number that indicates the data item by number, and the data in which the data of one day is arranged in time series are sequentially saved in 4 bytes. ing.

[0008]

However, the above-mentioned device has the following problems.

In this type of device, the data input by the unit computer 1 as shown in FIG. 7 is stored in the operation history data processing device 2. Here, regarding the data stored in the operation history data processing device 2 as the operation record, it is desired that the data of all input points of the unit computer 1 be stored in a short cycle and the data analysis can be performed in detail.

On the other hand, the number of data input to the unit computer 1 is increasing with the progress of the processing capability of the computer, and the storage capacity of the data stored in the operation history data processing device 2 tends to be enormous. It is in.

Therefore, according to the present invention, an operation history data processing apparatus capable of converting a huge amount of operation record data of a plant into a small data volume and efficiently storing the data so as not to deteriorate the data accuracy. The purpose is to provide.

[0012]

SUMMARY OF THE INVENTION The present invention relates to an operation history data processing apparatus for collecting various data from a plant and storing the collected plant data as history data in a storage medium, which corresponds to an input point from the plant. A file storage unit for collecting and storing each plant data, and a data capacity for storing the conversion data obtained by converting the plant data stored in the file storage unit using a data conversion formula for reducing the data length in the storage medium. A reduction processing unit and a data restoration conversion processing unit for reading restored data whose data length has been expanded by using a restoration conversion formula for inversely converting the conversion data stored in the storage medium into the original plant data Is.

[0013]

With the above structure, the amount of data stored in the operation history data processing device can be reduced, and a larger amount of data can be stored in the same storage medium.

[0014]

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

FIG. 1 is a block diagram of an operation history data processing device 2 and a unit computer 1 showing an embodiment of the present invention. The same reference numerals as those in FIG. 7 indicate the same or corresponding portions. The difference from FIG. 7 is that the data capacity reduction conversion processing unit 1
8 and the data restoration conversion processing unit 19 are additionally provided.

The data capacity reduction conversion processing unit 18 reduces the data capacity to be stored before the storage processing by the storage processing unit 11.

The data restoration conversion processing section 19 restores the data read from the data reading section 15 again.

With the above configuration, the unit computer 1 first reads the state of the plant from the sensor 3. At this time, the sensor 3 outputs the plant state value as an analog signal. Therefore, in the unit computer 1, this is converted into a digital value by the analog / digital converter 4 and the unit computer 1
Read in.

Here, the data read as a digital value is read as a data string of 12 bits to 16 bits due to the functional restriction of the analog / digital conversion unit 4. Therefore, the accuracy of the data at the time of reading the data is 2 Bytes or less.

The read data is further used as a plant state value as a value that can be recognized by the operator, and the unit conversion unit 5
Is converted into a value suitable for the unit designated for each input point, and stored in the plant data storage unit 6. Here, since the converted data has a data format represented by a unit designated for each data, it is converted into a data length necessary for this. The normal data length at this time is 4 bytes, and in this embodiment, it is treated as 4 bytes data.

In the unit computer 1, this data is used for plant monitoring, and is transmitted to the operation history data processing device 2 by the data transmission unit 7.

The operation history data processing device 2 receives the transmitted data at the data receiving section 8. The received data is edited by the daily file edit processing unit 9 into a daily file for each input point, and the daily file storage unit 10
To store.

The data capacity reduction conversion processing section 18 processes the data capacity reduction processing as shown in FIG.

Here, a case will be described in which the capacity of 1-day data captured in 4 bytes is reduced to 2 bytes. First, the maximum / minimum data retrieval unit 20 reads data from the daily unit file storage unit 10 and retrieves the maximum and minimum values of the data for one day.

Then, using the maximum value and the minimum value of the data retrieved by the maximum / minimum data retrieval section 20, the data conversion section 21 performs the data conversion processing by the following equation (1).

[0026]

[Equation 1]       Conversion data = (data value-minimum value) / (maximum value-minimum value) ......... (1)

The converted data is 0 to 1
The data value is represented by a decimal number between. The data capacity reduction processing unit 22 reduces the number of digits in the latter half of the decimal points below the data length of these converted data, and reduces the data content of one data. Here, it is assumed that the number of digits of the data to be reduced is a value corresponding to the number of data bits of the sensor 3 read by the unit computer 1, and is 2 bytes of data in this embodiment.

For example, the data capacity reduction processing unit 2 described above
The processing of No. 2 will be specifically described with reference to FIG. First, here, as a hypothetical condition, the sensor 3 is
Flow rate data is detected and 0-2200T / H is 4-20m
Detect with ADC. In addition, the unit computer 1 has the above 4
〜20mADC is converted and input by 800-4000 count value, and this is further unit-converted, 0-2200T / H
To display. The number of display digits at this time is two.

Here, the input of the sensor 3 is No. 1 to N
o. As shown in the sensor input column 31 of FIG. 3 corresponding to No. 4, “15.0”, “16.0”, “14.5”, “1”.
Calculate when there are 4 inputs of 2.0 "mA. The analog / digital converter 4 converts the four inputs of the sensor 3 as shown in the count value column 32. The unit conversion unit 5 converts the count value as shown in the unit conversion value column 33. The binary IBM format data in the unit conversion field 33 is shown in the floating point data format field in FIG. 4 as a 4-byte floating point number.

Next, 10 shown in the unit conversion value column 33 of FIG.
Using a maximum value of 1650.00 T / H and a minimum value of 1100.00 T / H from the base number (T / H), as in the case of the above-mentioned formula (1), for example, No. In the case of 1, the data capacity is reduced by the following equation (2).

[0031]

[Equation 2]       Conversion data = (data of No. 1-minimum value) / (maximum value-minimum value)       = (1512.50-1100) / (1650.00-1100.00)       = 0.75 ………… (2)

The above No. In 1, the converted data is "0.7
It becomes the value of "5". Other No. The numerical value of is as shown in the conversion data column 34. These numerical values are converted into a fixed decimal format as shown in the fixed decimal data format column shown in FIG. The above-mentioned converted 2-byte data in the fixed decimal format is shown in the fixed decimal format data column 35. In this way, reduced data is created.

2 Bytes by the data capacity reduction processing unit 22
The data reduced to e is edited by the capacity reduction file edit processing unit 23 into the file format of the capacity reduction file storage unit 24.

The capacity-reduced file storage unit 24 is shown in FIG.
Unlike the conventional data file shown in FIG. 8 configured as shown in FIG. 8, data 1 and data 2 reduced to 2 Bytes.
Besides, the maximum value and the minimum value retrieved by the maximum / minimum data retrieval unit 20 are stored together as a file.

Then, the capacity-reduced file storage unit 24
The data stored in is stored in the large-capacity data storage medium 12 such as an optical disk, after being processed by the storage processing unit 11.

On the other hand, the processing of the data restoration conversion processing section 19 will be described with reference to FIG.

First, the data stored in the data storage medium 12 is read from the data reading section 15. Next, the data restoration conversion processing unit 19 performs data conversion processing by the following formula (3) using the capacity reduced data as the conversion data and the maximum value and minimum value data.

[0038]

[Equation 3]       Restored data = capacity reduction data x (maximum value-minimum value) + minimum value ... (3)

In this calculation process, the data of 2 Bytes, which is stored in a small number between 0 and 1, is restored to the unit-converted data format received from the unit computer 1. At this time, the calculation result is represented by the original 4 Byte data and stored in the read data storage unit 16.

For example, in the example described with reference to FIG. 3, the fixed decimal format field 35 of FIG. 3 is again represented by 4 Byte data, and the data is restored. No. When the value is 1, the value is “0.75” in the capacity reduction data column of FIG. 6B, and thus the restored data is obtained by the equation (4) in the same manner as the equation (3).

[0041]

[Equation 4]       Restored data = No. Capacity reduction data of 1 * (maximum value-minimum value) + minimum value           = 0.75 * (1650.00-1100.00) +1100.00           = 1512.50 (T / H) ... (4)

In this way, the data is restored as shown in the restored data column 37 of FIG. 6 (B).

When the data stored as described above is read out and displayed, the retrieval condition of the data to be read out is interactively specified by the retrieval condition expression setting dialogue unit 13. The search command unit 14 passes the read command to the data read unit 15 according to the specified search condition. As a result, the data retrieved from the data storage medium 12 and the maximum and minimum value data are read.

Here, the retrieval target read out is
Since the data has been converted when saved, it is restored to data that can be displayed by the data restoration conversion processing unit 19, stored in the read data storage unit 16, and displayed on the display unit 17.

In this way, the data history at the time when the operation history data processor 2 receives the 4-byte data received from the unit computer 1 by the original unit computer 1, that is, the 2-byte data corresponding to the precision of the sensor 3.
The data of (12 to 16 bits) can be reduced without impairing the data accuracy. Therefore, it is possible to reduce the data capacity and save the data.

Here, the data capacity is reduced, and the stored data is compared with the conventional case where the data is not reduced,
The difference in data capacity will be described.

Assuming that 2000 points of input point data are stored in a 1-minute cycle as the data amount, since the data length of 1 data is 4 Bytes, the data portion has a total data capacity without data compression. The storage capacity required by the following equation (5) is required.

[0048]

[Equation 5]       4 Byte x 2000 points x 60 times x 1 hour x 24 hours         = 11520000 Byte = 11.52 MByte ……… (5)

On the other hand, in the case of data compression, the data length of one data is 2 Bytes, so the total data capacity requires the storage capacity calculated by the following equation (6).

[0050]

[Equation 6]       2 Byte x 2000 points x 60 times x 1 hour x 24 hours             = 5760000 Bytes = 5.76 MBytes ... (6)

Since data of maximum and minimum values are required for each input point in addition to the value obtained by the above equation (5) or equation (6), the data capacity obtained by the following equation (7) is added. Become.

[0052]

[Equation 7]       4 Byte x 2000 points x 2               = 16000 Bytes = 0.016 MBytes ... (7)

Therefore, the amount of data when the data is compressed is obtained by the following equation (8) as the sum of the results of the equations (6) and (7).

[0054]

[Equation 8]       5.76 MByte + 0.016 MByte                                   = 5.776MByte ... (8)

As described above, when the results of the equations (5) and (8) are compared, the amount of stored data is about half that in the case where the data is not compressed.

In this embodiment, the maximum value and the minimum value are searched from the daily operation history data and the data conversion is performed based on this data. However, the present invention is not limited to this, and the following may be applied. It can be carried out in the same manner as this embodiment.

First, the maximum value of daily operation history data,
It is also possible to perform conversion by using constants such as the upper limit value and the lower limit value of the sensor range instead of the minimum value, and the same effect is obtained.

Secondly, in the conversion processing of the present embodiment, each data is converted into a value between 0 and 1 to reduce the data capacity, but by simply dropping the last digit of the data. It is also possible to reduce the data capacity.

Thirdly, in the present embodiment, the data reduction conversion of only the data value is performed. However, in the case of plant data, the data has a quality (data quality such as the data does not deviate from the range). It also has the information to represent, and the data is 2By along with the quality information of the data.
The same effect can be obtained when expressed by te.

[0060]

As described above, according to the present invention, the operation history data is converted and saved so that the data capacity thereof is reduced and the accuracy of the data is not deteriorated. As a result, the data storage capacity can be reduced and a larger amount of data can be stored in the same storage medium.

[Brief description of drawings]

FIG. 1 is a block diagram showing a driving history data processing device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a data capacity reduction conversion process of the apparatus.

FIG. 3 is an explanatory diagram showing an example of FIG.

FIG. 4 is an explanatory diagram showing a data format of FIG.

FIG. 5 is an explanatory diagram showing a file structure of a data storage medium of the device.

FIG. 6 is an explanatory diagram showing a data restoration conversion process and a processing result of the device.

FIG. 7 is a block diagram of a driving history data processing device showing a conventional example.

FIG. 8 is an explanatory diagram showing a file structure of a conventional data storage medium of the apparatus.

[Explanation of symbols]

1 unit calculator 2 Operation history data processing device 11 Storage processing unit 12 Data storage medium 15 Data reading section 16 Read data storage 18 Data capacity reduction processing unit 19 Data restoration conversion processing unit

Claims (2)

[Claims] 1. An operation history data processing device for collecting various data from a plant and storing the collected plant data as history data in a storage medium, collecting and storing each plant data corresponding to an input point from the plant. A file storage unit for storing the plant data stored in the file storage unit, and a data capacity reduction processing unit for storing converted data in the storage medium, the conversion data being converted using a data conversion formula for reducing the data length; An operation history data processing device, comprising: a data restoration conversion processing unit that reads restoration data whose data length has been expanded by using a restoration conversion formula that reversely transforms the transformed data stored in the original plant data. 2. The data conversion formula uses a subtraction value obtained by subtracting the minimum value of plant data within a predetermined period from each plant data as a numerator, and subtracting the minimum value from the maximum value of plant data within the predetermined period. The subtraction value is divided as a denominator, and the restoration conversion equation is to multiply the conversion data by a subtraction value obtained by subtracting the minimum value from the maximum value, and add the minimum value to the multiplication value. The operation history data processing device according to claim 1, wherein