JP2006155135A - Data collection method and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that long hours of interruption of communication in a network connecting a computer with a measuring device results in loss of data, and measurement data are divided into a record data file in the computer and a backup file in the measuring device, thus management becomes complicated. <P>SOLUTION: A unique record identifier is set in the record data file in the computer and the backup file in the measuring device. If the communication in the network is interrupted, the measuring device side writes the measurement data into the backup file, and when the measurement is halted, the measuring device side identifies a back up file based on the record identifier, and embeds data of the backup file in a lost data portion of the record data file. Because the files in a single time series are reconfigured into one file, the data management is simplified. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a measurement data collection device that connects a data recording device and a measurement device via a network, and relates to a data collection method and device that can repair missing data.

  FIG. 4 shows the configuration of a data collection device using a network. In FIG. 4, a computer 4 that is a data recording device and a measuring instrument 6 are connected by a network 5. The measuring device 6 transmits measurement data to the computer 4 via the network 5 in response to a request from the computer. The computer 4 stores the received measurement value in a recording data file. A plurality of measuring instruments 6 are connected to the normal network 5.

  In such a data collection device, if a failure occurs in the network 5 and communication becomes impossible, data during that time is lost. Usually, since the measuring instrument has a buffer of a predetermined size, the data remaining in this buffer can be restored when communication is resumed. However, since the capacity of the buffer is limited, if the time during which communication cannot be performed becomes long, the measurement data overflows from the buffer and cannot be restored.

  A measuring instrument with a built-in storage device such as a memory card or hard disk can automatically store measurement data from when communication is lost until it returns to the storage device as a backup file. However, since the measurement data is divided into a recording data file of the computer 4 and a backup file of the measuring device 6, there is a disadvantage that data management becomes troublesome.

  This will be described with reference to FIG. FIG. 5A shows the change over time of the measurement data recorded in the recording data file of the computer 4, with the horizontal axis representing time and the vertical axis representing measurement values. Assume that a network failure occurs at time t11 and communication cannot be performed, and the network returns at t14. At this time, the measurement data from t13 to t14 remains in the buffer of the measuring instrument 6 and can be restored. However, the measurement data from t11 to t13 cannot be restored and becomes missing data.

  FIG. 5B shows measurement data stored as a backup file in the storage device of the measuring instrument 6. When the measuring device 6 detects a disconnection at time t12, backup is started. Since the measurement data from time t10 to t12 remains in the buffer, the backup is started from time t10. This backup is continued until t14 when communication returns.

The collected data is stored in duplicate in the two logging files, and when one system is restarted after an abnormal stop, each saved data is missing based on the last storage time in the management file of the logging file For example, Patent Document 1 discloses an apparatus that identifies a period that has been deleted and calls data from the other period to restore the missing part.
JP-A-9-160845

  However, such a data collection device has the following problems. A measuring instrument that does not have a storage device cannot restore measurement data that overflows from the buffer. Therefore, when the time during which communication cannot be performed becomes long, most of the measurement data does not remain in the buffer and is permanently lost.

  If the capacity of the buffer is increased, the ratio of the measurement data lost is reduced. However, for this purpose, a large-capacity memory must be installed, and there is a problem that the cost increases.

  A measuring instrument with a built-in storage device can store measurement data even if communication is not possible for a long time. However, since one time series data is divided and stored in a recording data file of the computer 4 and a backup file of the measuring instrument 6, there is a problem that it takes time and effort to manage and check data.

  Therefore, the problem to be solved by the present invention is that data backup and data confirmation are facilitated by reading a backup file stored in the storage device of the measuring instrument after measurement is stopped and embedding the data in a recorded data file of the data recording device. It is an object of the present invention to provide a data collection method and apparatus capable of performing the above.

In order to achieve such a problem, the invention according to claim 1 of the present invention is:
In a data collection method for transmitting measurement data generated by a measuring instrument to a data recording device via a network and storing the data in the data recording device,
Generating a unique recording identifier at the start of measurement;
Storing the measurement data sent from the measuring instrument in a recording data file arranged in the data recording device and set with the recording identifier;
Storing the measurement data in a backup file placed in the measuring instrument and set with the recording identifier while communication of the network is interrupted;
When the measurement is stopped, reading the backup file having the same recording identifier as the recording identifier set in the recording data file, and embedding the data of the backup file in the corresponding position of the recording data file;
Is provided. Since one time-series data is stored in one file, data management and confirmation become easy.

The invention according to claim 2 is the invention according to claim 1,
When measurement is stopped, a backup file in the measuring instrument is searched, a list of recording identifiers and backup files is created, and the backup file is read based on this list. A backup file with the same record identifier can be easily found.

The invention according to claim 3 is the invention according to claim 1 or claim 2,
When communication on the network is interrupted, missing data indicating that the measurement data is missing is written in a predetermined position of the recording data file. Defects can be found with certainty.

The invention according to claim 4
In the data collection device configured to connect the data recording device and the measuring device via a network, and transmit the measurement data measured by the measuring device to the data recording device via the network and store the data.
A record identifier generating unit for generating a record identifier that is not duplicated at the start of measurement;
A backup file creation unit that is arranged in the measuring device and creates a backup file in which the recording identifier is set, and writes measurement data to the backup file while communication by the network is interrupted,
The recording data file in which the recording identifier is set is generated, the measurement data sent from the measuring device via the network is stored in the recording data file, and when the measurement is stopped, the recording data file is stored. A measurement data recording unit that reads the backup file in which the same recording identifier as the recording identifier set in is read and embeds the measurement data of the backup file in a predetermined position of the recording data file;
Is provided. Since one time-series data is stored in one file, data management and confirmation become easy.

The invention according to claim 5 is the invention according to claim 4,
When the measurement is stopped, the device connected to the network is searched for, and the recording identifier and a file list creation unit for creating a list of the backup files are provided,
The measurement data recording unit reads the backup file based on the file list. A backup file with the same record identifier can be easily found.

The invention according to claim 6 is the invention according to claim 4 or claim 5,
The measurement data recording unit is configured to write missing data indicating that the measurement data is missing at a predetermined position of the recording data file when communication of the network is interrupted. Defects can be found with certainty.

As is apparent from the above description, the present invention has the following effects.
According to the inventions of claims 1, 2, 3, 4, 5 and 6, the same recording identifier is set in the recording data file in the data recording device and the backup file in the measuring instrument, and network communication is interrupted. Sometimes, when the measurement data is stored in the backup file and the measurement is stopped, a backup file having the same recording identifier is read out and the data is embedded in a predetermined position of the recording data file.

  Even if the network communication is temporarily interrupted, one time-series data is stored in one file, so that it is possible to easily check and manage the data. In addition, data loss can be reduced, and data safety can be maintained.

  Further, by setting the same unique recording identifier for the recording data file and the backup file, there is also an effect that the recording data file and the backup file can be easily and reliably associated with each other. Furthermore, there is an effect that loss of measurement data can be prevented without increasing the capacity of the buffer.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a data collection apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a computer that is a data recording device, which includes a recording identifier generation unit 11, a measurement data recording unit 12, a file list creation unit 13, and a communication interface 14.

  Reference numeral 3 denotes a measuring instrument, which includes a measuring unit 31, a backup file creating unit 32, and a communication interface 33, and has a built-in storage device. Further, the computer 1 and the measuring instrument 3 are connected by the network 2 via the communication interfaces 14 and 33. In this embodiment, one measuring device 3 is connected to the network 2, but usually two or more measuring devices are connected.

  At the start of measurement, the recording identifier generation unit 11 creates a recording identifier (ID) that does not overlap. This record identifier is transmitted to the measuring device 3 via the network 2 and set. As described above, a plurality of measuring devices 3 are connected to the normal network 2, and record identifiers are set for all the measuring devices. The measurement data recording unit 12 creates a recording data file and stores the recording identifier in this recording data file.

  Measurement data is created by the measurement unit 31 and stored in a buffer (not shown). This measurement data is transmitted to the computer 1 via the network 2 in response to a collection request from the computer 1. The measurement data recording unit 12 stores the received measurement data in a recording data file having the same recording identifier as the transmission source measuring device 3 in time series.

  When it is detected that communication cannot be performed due to a failure in the network 2, the backup file creation unit 32 creates a backup file in the storage device and writes measurement data. In this backup file, the record identifier transmitted from the computer 1 at the start of measurement is also written. When the communication is restored, writing of the measurement data to the backup file is stopped, and the operation of transmitting new measurement data is resumed in response to the collection request of the computer 1.

  If communication becomes impossible, the computer 1 cannot receive measurement data. The measurement data recording unit 12 writes the missing data indicating that the data is missing into the recorded data file. When communication returns, a collection request is again output to the measuring instrument 3, and the transmitted measurement data is written into the recording data file.

  When the measurement is completed and the writing to the recording data file is stopped, the computer 1 copies the backup file from the measuring instrument 3, embeds the missing data using the data in the backup file, and reconstructs the recording data file.

  Next, details of the missing data embedding process executed after the measurement is stopped will be described with reference to FIG. In FIG. 2, first, in (A-1), the file list creation unit 13 acquires the identifier of the recording data file from the measuring device 3. Then, the measuring instrument connected to the network 2 is searched in order in (A-2), and a list of files storing the same recording identifier among the backup files stored in the measuring instrument is created.

  When all the measuring instruments connected to the network are searched, the list creation is completed (A-3). When the list creation is completed, this list is sent to the measurement data recording unit 12. The measurement data recording unit 12 reads the backup file data based on this list in (A-4). When it is checked in (A-5) that all backup file data having the same recording identifier has been read, the data in this backup file is embedded in the position of missing data in (A-6). This operation is performed for all recording data files.

  Next, embedding of measurement data will be described with reference to FIG. The horizontal axis in FIG. 3 is time, and the vertical axis is the value of measurement data. FIG. 3A shows measurement data stored in a recording data file of the computer 1 before embedding. Communication is interrupted at time t2 and returned at time t5. The measurement data between time t4 and t5 can be restored because it is stored in the buffer, but cannot be restored from time t2 to t4. In this part, missing data is stored.

  FIG. 5B shows measurement data stored in a backup file in the measuring instrument 3. Although the communication disconnection is detected at time t3, since the measurement data from time t1 to t3 is stored in the buffer, backup is started from time t1. Since communication is restored at time t5, backup is terminated at time t5.

  FIG. 6C shows the measurement data of the recording data file when the data of the backup file is embedded in the missing data portion of the recording data file. It can be seen that the missing data is embedded and the measurement data is completely restored.

  In this way, the measurement data while communication is disconnected is completely restored to one recorded data file. Therefore, data management and confirmation can be easily performed. In addition, the kind of measuring device 3 is not specifically limited, It can apply to all the measuring devices connected via a network. The network is a general term for communication paths, and can be applied to any data collection apparatus as long as it is an apparatus in which the computer 1 and the measuring device 3 are connected via a communication path.

It is a block diagram which shows one Example of this invention. It is a flowchart which shows one Example of this invention. It is a characteristic view which shows the effect of this invention. It is a block diagram of the conventional data collection device. It is a characteristic view of the conventional data collection device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Computer 11 Recording identifier production | generation part 12 Measurement data recording part 13 File list creation part 2 Network 3 Measuring device 31 Measurement part 32 Backup file creation part

Claims (6)

In a data collection method for transmitting measurement data generated by a measuring instrument to a data recording device via a network and storing the data in the data recording device,
Generating a unique recording identifier at the start of measurement;
Storing the measurement data sent from the measuring instrument in a recording data file arranged in the data recording device and set with the recording identifier;
Storing the measurement data in a backup file placed in the measuring instrument and set with the recording identifier while communication of the network is interrupted;
When the measurement is stopped, reading the backup file having the same recording identifier as the recording identifier set in the recording data file, and embedding the data of the backup file in the corresponding position of the recording data file;
A data collection method characterized by comprising:   A step of searching for a backup file in the measuring device when measurement is stopped, creating a list of recording identifiers and backup files, and reading the backup file based on the list is provided. Item 2. The data collection method according to Item 1.   3. The missing data indicating that the measurement data is missing is written in a predetermined position of the recording data file when communication of the network is interrupted. The data collection method described. In the data collection device configured to connect the data recording device and the measuring device via a network, and transmit the measurement data measured by the measuring device to the data recording device via the network and store the data.
A record identifier generating unit for generating a record identifier that is not duplicated at the start of measurement;
A backup file creation unit that is arranged in the measuring device and creates a backup file in which the recording identifier is set, and writes measurement data to the backup file while communication by the network is interrupted,
The recording data file in which the recording identifier is set is generated, the measurement data sent from the measuring device via the network is stored in the recording data file, and when the measurement is stopped, the recording data file is stored. A measurement data recording unit that reads the backup file in which the same recording identifier as the recording identifier set in is read and embeds the measurement data of the backup file in a predetermined position of the recording data file;
A data collection device comprising: When the measurement is stopped, the device connected to the network is searched for, and the recording identifier and a file list creation unit for creating a list of the backup files are provided,
5. The data collection apparatus according to claim 4, wherein the measurement data recording unit reads the backup file based on the file list. The measurement data recording unit is configured to write missing data indicating that measurement data is missing at a predetermined position of the recording data file when communication of the network is interrupted. The data collection device according to claim 4 or 5.

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