JP2006113964A - Measurement data collection device and measurement data collection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement data collection device and a measurement data collection system preventing failure in reading a data file during writing it for improvement in reliability of collection of measurement data. <P>SOLUTION: This measurement data collection device is constructed of a measurement unit 2a periodically acquiring detection data from a sensor 2, a data file creation part 15 creating a data file consisting of dummy data, a file management control part 16 reading a FAT 4a from a memory card 4, storing the data file created by the data file creation part 15 in the memory card 4 based on the FAT, and writing allocation information about a storage area of the data file in the FAT 4a to store it in the memory card 4, and a file data replacement control part 13 accessing the memory card 4 based on the detection data to sequentially replacing the dummy data inside the data file, in which the allocation information is written in the FAT 4a, by the detection data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a measurement data collection device and a measurement data collection system, and more particularly to an improvement of a measurement data collection device that collects detection data from a sensor such as a thermocouple and accumulates it in a data file.

  Usually, detection data obtained by a sensor such as a thermocouple is temporarily stored in a data collection device in order to prevent data loss due to a transmission error.

  In the data collection device, a data file composed of the detection data is generated and stored in a nonvolatile storage means. At that time, when the file management means ends the writing operation to the data file and closes the data file, the allocation information related to the storage area of the data file is written to an allocation table (for example, FAT: File Allocation Table). The allocation table is updated.

  In the conventional data collecting apparatus as described above, when the system goes down due to a power failure or the like, the data file being written cannot be read from the storage means, and all the detected data in the data file is lost. . That is, since the allocation table is updated when the data file is closed, if the system goes down before the writing to the data file is completed, the allocation table is not updated normally. For this reason, there is a problem that the allocation information of the data file relating to the update of the allocation table is lost, and the detection data cannot be read out.

  Further, in the conventional data collecting apparatus, since the file size of the data file is not determined until the data file is closed, there is a problem that overflow occurs during writing to the data file and detection data cannot be written.

  Further, the conventional data collection system including the data collection device and the processing terminal has a problem that the contents of the data file acquired from the data collection device via the communication line may be different from those in the data collection device. That is, a conventional data collection system that uploads a data file to a server on a communication line via the file management means of the data collection device and allows browsing on the processing terminal is performed by the file management means at the time of uploading the data file being written by the file management means. Transfer all data files it contains to the server. For this reason, the data file that was being written at the time of uploading is updated on the data collection device side by subsequent detection data writing, whereas the data that is being written on the processing terminal side that acquired the data file from the server at the time of uploading Since it is impossible to identify whether or not the file is a file, the data file is not updated, and the content differs between the data collection device and the processing terminal.

  The present invention has been made in view of the above circumstances, and provides a measurement data collection device and a measurement data collection system that prevent a data file being written from becoming unreadable and improve the reliability in collecting measurement data. The purpose is to provide. In particular, it is an object of the present invention to provide a measurement data collection device that can read detection data in a data file even when the system is down before writing of detection data to the data file is completed. It is another object of the present invention to provide a measurement data collection device that can predict that an overflow will occur during writing to a data file.

  Another object of the present invention is to provide a measurement data collection system that can always match the contents of a data file acquired from a measurement data collection device via a communication line with those in the measurement data collection device.

  A measurement data collection device according to the present invention comprises measurement data acquisition means for periodically acquiring detection data from a sensor, data file generation means for generating a data file consisting of dummy data, and allocation information relating to the storage area of the data file. The allocation table is read from the rewritable nonvolatile file storage means, the data file generated by the data file generation means is stored in the file storage means based on the allocation table, and the allocation information relating to the storage area of the data file Is stored in the file storage means and the file storage means is accessed based on the detection data, and the allocation information is written in the allocation table. Constructed and a file data replacement means for sequentially replacing the dummy data in the data file to the detection data.

  Prior to writing the detection data, first, a data file composed of dummy data is generated and stored in the file storage means. At this time, the allocation table in which the allocation information related to the storage area of the data file is written is also stored in the file storage means. When writing the detection data to the data file, the detection data can be written without changing the allocation table by replacing the dummy data with the detection data for the data file in which the allocation information is written in the allocation table. Done. That is, when the detection data is written, the allocation table relating to the data file is not updated, and the data file can always be correctly read from the file storage means. Therefore, even if the system is down before writing of the detection data to the data file is completed, the detection data in the data file can be read.

  In addition to the above-described configuration, the measurement data collection device according to the present invention lists a data file that has been replaced with detected data as a completed file, a file list generating unit that generates a completed file list, and an information processing terminal And a file transmission means for outputting the completed file list in response to the file list request.

  Specifically, the file data replacement unit refers to when accessing the file storage unit, and the rewrite stores the file instruction information for designating the data file in which the allocation information is newly written in the allocation table by the file management unit. Volatile instruction information storage means is provided, and the file list generation means is configured to generate a completed file list based on the file instruction information.

  According to such a configuration, since a completed file list is output in response to a file list request from the information processing terminal, the information processing terminal can obtain via the communication line is the completion of replacement of dummy data It becomes only a file. Therefore, regarding the data file downloaded from the measurement data collection device by the information processing terminal, the data file corresponding to the data file is not changed by the addition of new detection data in the measurement data collection device, and the contents of the data file Can always be matched between the measurement data collection device and the information processing terminal. Further, since the file instruction information referred to by the file list generating means is stored in the volatile instruction information storage means, it disappears when the power supply to the instruction information storage means is stopped due to a system down. For this reason, the data file in which the detection data was being written before the system went down is regarded as a completed file by the disappearance of the file instruction information after the system goes down, and can be downloaded by the information processing terminal.

  In addition to the above configuration, the measurement data collection device according to the present invention is configured so that the file management unit deletes allocation information related to a data file to be deleted from the allocation table in response to a file deletion request from the information processing terminal. Composed.

  In addition to the above-described configuration, the measurement data collection device according to the present invention, when the data file generation unit finishes replacing the dummy data with the detection data in a certain data file, the data file to which the detection data is to be written next. In addition, a data file is generated as a preliminary file.

  According to such a configuration, when replacement with detection data in a certain data file is completed, a spare file is generated in addition to the data file to which detection data is to be written next. For this reason, even if the reserve file cannot be stored in the file storage means because the storage area that can be stored is smaller than the file size, the detection data is not transferred to the data file to which the detection data is to be written next. Can be written. At that time, since the allocation table is updated before the start of writing of the detection data to the data file and the file size of the data file is determined, an overflow in the file storage means is performed before the detection data cannot be written to the data file. Can be predicted.

  Specifically, the information management device includes warning information generation means for generating overflow warning information when the file management means fails to store the spare file.

  A measurement data collection system according to the present invention collects detection data from a sensor and accumulates the data in a data file, and information processing that acquires a data file from the measurement data collection device via a communication line and performs data processing A measurement data acquisition unit that periodically acquires detection data from a sensor, a data file generation unit that generates a data file including dummy data, and an allocation related to a storage area of the data file An allocation table consisting of information is read from a rewritable nonvolatile file storage means, the data file generated by the data file generation means is stored in the file storage means based on the allocation table, and a storage area for the data file File management means for writing the allocation information related to the allocation table and storing it in the file storage means, and accessing the file storage means based on the detection data, and the dummy data in the data file in which the allocation information is written in the allocation table File data replacement means for sequentially replacing the detected data.

  In addition to the above-described configuration, the measurement data collection system according to the present invention may be configured such that the measurement data collection device causes the data file generation unit to detect the detection data after replacement of the dummy data with the detection data in a certain data file is completed. In addition to the data file to be written, the information processing terminal includes a warning information generating unit that generates a data file as a backup file and generates overflow warning information when the file management unit fails to store the backup file, Is configured to include a mail transmission means for transmitting an electronic mail based on overflow warning information from the measurement data collection device.

  In addition to the above-described configuration, the measurement data collection system according to the present invention includes a file format conversion unit that converts the acquired data file into a predetermined text format, and the information processing terminal generates a data file for the measurement data collection device. The means is configured to generate the data file as a binary file.

  According to the measurement data collection device and the measurement data collection system of the present invention, the detection data is written without changing the allocation table. Therefore, even when the system is down before writing of the detection data to the data file is completed, the detection data in the data file can be read, and the reliability in collecting the measurement data can be improved. .

  In addition, since the information processing terminal can obtain the completed file after replacement of the dummy data through the communication line, regarding the data file downloaded from the measurement data collection device by the information processing terminal, the data corresponding to the data file The file is not changed by adding new detection data in the measurement data collection device, and the contents of the data file can always be matched between the measurement data collection device and the information processing terminal. In addition, since the file instruction information referred to by the file list generation unit disappears when the power supply to the instruction information storage unit is stopped due to the system down, the data file in which the detection data was being written before the system down After the system is down, it is regarded as a completed file by the disappearance of the file instruction information and can be downloaded by the information processing terminal.

  In addition, when replacement with detected data is completed in a data file, a spare file is generated in addition to the data file to which detection data is to be written next, so that the spare file cannot be stored in the file storage means. Even if it exists, the detection data can be written to the data file to which the detection data is to be written next. At that time, since the allocation table is updated before the start of writing of the detection data to the data file and the file size of the data file is determined, an overflow in the file storage means is performed before the detection data cannot be written to the data file. Can be predicted.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an example of a schematic configuration of a measurement data collection system according to Embodiment 1 of the present invention. The measurement data collection system according to this embodiment includes a measurement data collection device 1 that collects detection data, and an information processing terminal 8 that acquires data files from the measurement data collection device 1 via communication lines 7a and 7b and performs data processing. And a mail server 9 connected to the communication network 7c.

  The measurement data collection device 1 is a storage unit for detection data that collects detection data input from a detection element (sensor) such as a thermocouple and stores it as a data file. The measurement unit 2a, the memory unit 5, and the display unit 6 Consists of.

  The measurement unit 2a is measurement data acquisition means for periodically acquiring detection data from the sensor. The measurement unit 2a is provided with an input interface 11 including a plurality of connection terminals, and a plurality of sensors can be connected simultaneously. In the measurement data collection device 1, two or more measurement units 2a can be connected and used as necessary, and detection data from the sensor is input via the input interface 11 in each measurement unit 2a. That is, the detection data from each sensor for each measurement unit 2a can be stored together as one data file.

  The memory unit 5 is a drive device that drives a storage medium, and is provided with a card slot 25 into which a memory card as a storage medium can be inserted and removed. Detection data collected via each measurement unit 2a is stored in a memory card inserted into the card slot 25.

  The display unit 6 is an apparatus main body (master unit) having a display screen 20a composed of an LCD, and performs control related to collection of detection data and accumulation of data files. In addition to the detection data, date information, file number, division information, sampling information, the number of units, the number of channels used in each measurement unit 2a, measurement information, and the like can be displayed on the display screen 20a. Each unit is connected to the display unit 6 in the order of the memory unit 5 and the measurement unit 2a.

  The measurement data collection device 1 outputs a data file to the information processing terminal 8 via a communication line 7a such as a USB (Universal Serial Bus), and also uses a LAN (Local Area Network) or the Internet according to a predetermined file transfer protocol. It is a server (for example, an FTP server) that can also transmit a data file to the information processing terminal 8 via the communication network 7c.

  Here, it is assumed that up to eight measuring units 2a can be connected. The number of sensors that can be connected simultaneously in each measuring unit 2a (maximum number of channels) is assumed to be eight. In addition, a rewritable nonvolatile storage medium is used as the memory card. For example, a flash memory card as a small and lightweight semiconductor storage device can be used. Here, the memory card is used as the storage means. However, any other rewritable nonvolatile storage medium may be used. For example, a magnetic storage medium such as a hard disk may be used. .

  FIG. 2 is a block diagram showing an example of the details of the main part in the measurement data collection system of FIG. 1, and performs a measurement operation for accumulating detection data from the sensor 2 as a data file in the memory card 4 in the card slot 25. A configuration within the data collection device 1 is shown.

  The measurement data collection device 1 includes an A / D conversion unit 12, a file data replacement control unit 13, a main control unit 14, a data file generation unit 15, a file management control unit 16, a file list generation unit 17, a communication control unit 18, The display control unit 19, the operation input unit 21, the ROM 22, and the RAMs 23 and 24 are included. The power consumed in each part is supplied from the external power supply circuit 3 as necessary.

  Detection data input from the sensor 2 via the input interface 11 is converted into digital data by the A / D converter 12. Conversion to digital data is performed, for example, by quantizing the detection signal at a predetermined sampling period.

  The data file generation unit 15 performs an operation of generating a data file 4c composed of dummy data that can be replaced with detection data. The generated data file 4c is stored in the memory card 4 based on the FAT 4a by the file management control unit 16, and the allocation information is written in the FAT 4a. Here, the data file 4c includes a predetermined number of two or more dummy data having a predetermined data size.

  The FAT (File Allocation Table) 4 a is an allocation table made up of allocation information related to the storage area of the data file, and is stored in the memory card 4. That is, when the file management control unit 16 newly stores the data file 4c in the memory card 4, the file management controller 16 reads the FAT 4a from the memory card 4, searches for a free space, and stores the data file 4c. Note that the file management control unit 16 also searches the storage area based on the FAT 4 a when reading / writing the file data 4 c already stored in the memory card 4.

  The file data replacement control unit 13 performs control to replace the dummy data with the detection data by accessing the memory card 4 via the main control unit 14 when the detection data is stored in the data file 4c. That is, when detection data is input from the A / D conversion unit 12, the data file 4c on the memory card 4 is directly accessed without going through the file management control unit 16, and the data file 4c in which the allocation information is written in the FAT 4a. The operation of sequentially replacing the dummy data in the data with the detected data is performed.

  The replacement of the data file 4c with the detection data, that is, the writing of the detection data to the data file 4c on the memory card 4 is performed based on a write task stored in the RAM 23. The RAM 23 is a rewritable volatile semiconductor memory, and a write task is generated by the file data replacement control unit 13 when a data file 4 c is newly stored in the memory card 4. This write task includes the file number of the newly stored data file 4c and its FAT information, and can specify the write destination of the detected data. That is, the write task is a pointer that specifies the data file 4c to be written to and indicates the write position in the data file.

  Here, the detection data is stored for each measurement unit 2a, and a unit number is added. The unit number is identification information for measuring units assigned in advance to each measuring unit 2a, and at the same time, is identification information for identifying whether or not replacement with detection data has been completed. That is, it is possible to identify that the data is replaced data, that is, detection data, not dummy data, by the unit number assigned to each data.

  The detection data is written after the data file 4c is stored in the memory card 4, the allocation information is written in the FAT 4a and the FAT 4a is stored in the memory card 4. Therefore, the data file 4c is started after the detection data is written. The allocation table according to the above has already been updated, and the data file 4c can always be correctly read from the memory card 4. Therefore, even if the power supply to the system is stopped due to a power failure or the like before the writing of the detection data to the data file 4c is completed and the system is down, if the power supply to the system is restored, the data The detection data in the file 4c can be read out.

  The file list generation unit 17 performs an operation of listing the data file 4c in which the replacement of the dummy data with the detected data is completed and generating a completed file list. The replacement to the detection data, that is, the writing of the detection data to the data file 4c is completed, for example, when the dummy data is all replaced with the detection data by the file data replacement control unit 13, and the process proceeds to the writing to the next data file 4c. . That is, based on the write task on the RAM 23, the end of replacement by the detected data is determined.

  The data file 4c that has been replaced with the detected data becomes a completed file 4b, and a completed file list including the completed file 4b is stored in the RAM 24 by the file list generation unit 17.

  The communication control unit 18 performs control related to file transfer based on an FTP (File Transfer Protocol) server program on the ROM 22. Specifically, in response to a file list request from the information processing terminal 8, an operation for outputting a completed file list is performed. That is, when the file list request transmitted by the information processing terminal 8 is received, the completed file list is read from the RAM 24 based on the file list request and transmitted to the information processing terminal 8.

  Further, the communication control unit 18 performs an operation of outputting the completion file 4b in response to the file transfer request from the information processing terminal 8. That is, when the file transfer request transmitted by the information processing terminal 8 is received, the completion file 4b is read from the memory card 4 based on the file transfer request and transmitted to the information processing terminal 8. In response to the file list request from the information processing terminal 8, the completed file list on the RAM 24 is output. Therefore, the information processing terminal 8 can obtain the completed file 4b after the replacement of the dummy data is completed via the communication line. It becomes only. Therefore, regarding the data file downloaded from the measurement data collection device 1 by the information processing terminal 8, the data file corresponding to the data file is not updated by the addition of new detection data in the measurement data collection device 1, and the data file The contents of the file can always be matched between the measurement data collection device 1 and the information processing terminal 8. At this time, the write task on the RAM 23 referred to by the file data replacement control unit 13 disappears when the power supply to the RAM 23 is stopped due to a system down. For this reason, the data file in which the detection data was being written before the system was down is regarded as a completed file by the disappearance of the writing task on the RAM 23 after the system is down, and can be downloaded by the information processing terminal 8. become able to.

  In response to the file deletion request from the information processing terminal 8, the communication control unit 18 instructs the file management control unit 16 to delete the completion file 4 b. Based on this deletion instruction, the file management control unit 16 performs control to delete the allocation information related to the data file to be deleted from the FAT 4a. The data file from which the allocation information has been deleted from the FAT 4a cannot be read from or written to the data card, and the data file itself is deleted from the memory card 4 in the same manner as the data file itself. It becomes a part of the area where the data file can be stored. That is, if necessary, the completion file 4b accumulated in the measurement data collection device 1 can be deleted to increase the data file storage area.

  FIG. 3 is a block diagram showing an example of the details of the main part in the measurement data collection system of FIG. 1, and an information processing terminal 8 such as a personal computer that generates a file list request, a file transfer request, and a file deletion request at regular intervals. It is shown. The information processing terminal 8 includes a main control unit 50, a file management control unit 51, a communication control unit 52, a display unit 53, an operation input unit 54, a ROM 55, and a storage unit 56.

  The file management control unit 51 controls the reading and writing of the data file with respect to the rewritable nonvolatile storage unit 56 such as a hard disk, and the data file acquired via the communication control unit 52 is stored in the storage unit 56. .

  The communication control unit 52 controls the file transfer to the measurement data collection device 1 based on the FTP client program on the ROM 55. Specifically, a file list request, a file transfer request, and a file deletion request are generated at regular intervals and transmitted to the measurement data collection device 1.

  FIGS. 4A to 4D are diagrams illustrating an example of a data file generated in the measurement data collection apparatus of FIG. FIG. 4A shows the entire image in the file format divided into blocks, and FIG. 4B shows details of the header block 31. 4C shows details of the file information block 32 in the data file 4c, and FIG. 4D shows details of the data block 33.

  The data file 4 c includes a header block 31, a file information block 32, and a data block 33. The header block 31 arranged at the head of the data file 4c stores the data size (unit: bytes) of each block. Here, the data sizes 31a and 31b of the file information block 32 and the data block 33 are stored as block sizes 1 and 2, respectively.

  The file information block 32 arranged next to the header block 31 stores date information 34, file number 35, division flag 36, sampling information 37, unit number 38, channel number 39 of each unit, and measurement information 40. Yes. The date information 34 is the date and time when the detection data was written, and the date and time when the first detection data for the data file 4c was sampled is stored as the date information 34. The file number 35 is serial data for identifying each data file 4c.

  The division flag 36 is identification information indicating that the detection data is divided and stored when the series of detection data is divided into a plurality of data files 4c and collected. That is, the division flag 36 added to the data file 4c can identify that the data file 4c stores a series of detection data.

  The sampling information 37 includes a sampling period and the number of samplings. The sampling period is a data repetition interval when the detection signal from the sensor is sampled and detection data is periodically obtained. Here, time data in the range from 1 μs to 1 h (time) is stored. The sampling number is the number of detected data stored in the data file 4c, and a number from 1 to 4000000 is stored. Note that the time required to collect data for one file can be obtained from sampling cycle × sampling number.

  The unit number 38 is the number of measurement units connected to the master unit (display unit 6), and stores the number of measurement units 2a in which the number of channels to be used is 1 or more. The unit number 38 stores a number from 1 to 8. The number of channels 39 for each unit stores the number of channels used for each measurement unit 2a. The measurement information 40 stores an input range at the time of measurement (for example, a temperature threshold value in the detection data, a voltage level threshold value in the detection signal), and the like.

  The data block 33 arranged next to the file information block 32 is provided with a data storage area 42 for each channel by adding a unit number 41 to each measurement unit 2a. Each unit number 41 stores a number from 1 to 8. Here, when data other than this is stored as the unit number 41, the data after the unit number 41 is considered invalid. That is, when all the dummy data stored in advance in the data storage area 42 in the unit is replaced with the detection data, the unit number 41 is assigned at the end of the replacement, whereby the data in the unit becomes the detection data. It is possible to identify whether or not the data has been replaced.

  The unit number 41 is assumed to have a data size of 1 byte. Each data storage area 42 stores data having a data size of 2 bytes. The data size of the data block 33 can be obtained from the number of units × 1 byte × sampling number + total number of channels × 2 bytes × sampling number.

  FIG. 5 is a state transition diagram showing an example of a file transfer operation in the measurement data collection system of FIG. 1, and the measurement data collection device 1 transfers the completed file 4b in response to a file transfer request from the information processing terminal 8. The situation is shown. In response to the file transfer request from the information processing terminal 8, the measurement data collection device 1 transfers only the data file (completed file 4b) for which detection data has been written, and the data file being written when the file transfer request is received. 4c is not transferred.

  Thereby, regarding the data file downloaded from the measurement data collection device 1 by the information processing terminal 8, it is possible to prevent the data file corresponding to the data file from being updated by the addition of new detection data in the measurement data collection device 1. Therefore, the contents of the data file can always be matched between the measurement data collection device 1 and the information processing terminal 8.

  FIG. 6 is a state transition diagram showing an example of a file deletion operation in the measurement data collection system of FIG. 1, and the completion file 4b in the measurement data collection device 1 is deleted in response to a file deletion request from the information processing terminal 8 The state of being done is shown. In response to the file deletion request from the information processing terminal 8, the measurement data collection device 1 deletes only the data file for which detection data has been written, and does not delete the data file 4c that is being written when the file deletion request is received.

  As a result, the data file 4c being written can be protected and the detected data can be continuously accumulated, and the completion file 4b can be deleted from the memory card 4 so that an empty area in the storage area in the memory card 4 can be obtained. Can be increased.

  Steps S101 to S107 in FIG. 7 are flowcharts showing an operation example as an FTP server in the measurement data collection apparatus in FIG. First, if there is a login request from the information processing terminal 8, the communication control unit 18 permits it and accepts a file list request from the information processing terminal 8 (steps S101 and S102).

  Next, the file list generation unit 17 generates a completed file list based on the write task on the RAM 23 in accordance with an instruction from the communication control unit 18, stores it in the RAM 24, and sends the completed file list to the information processing terminal 8. The list is transmitted (step S103). The communication control unit 18 reads the completion file on the memory card 4 in response to a file transfer request from the information processing terminal, and transmits it to the information processing terminal (steps S104 and S105).

  Next, the communication control unit 18 deletes the completed file on the memory card 4 in response to the file deletion request from the information processing terminal 8 (steps S106 and S107).

  Steps S201 to S208 in FIG. 8 are flowcharts showing an operation example in the information processing terminal in FIG. First, the communication control unit 52 transmits a login request to the measurement data collection device 1 at regular intervals (steps S201 and S202). Upon receiving the completed file list from the measurement data collection device 1 (step S203), the communication control unit 52 generates a file transfer request specifying a data file to be downloaded based on the file list, and collects the measurement data collection It transmits with respect to the apparatus 1 (step S204, S205).

  Next, when receiving the data file from the measurement data collection device 1, the communication control unit 52 instructs the file management control unit 51 to store the data file in the storage unit 56 (step S206). After storing the data file, the communication control unit 52 generates a file deletion request for causing the measurement data collection device 1 to delete the data file (completion file) corresponding to the data file, and the measurement data collection device 1 (Steps S207 and S208). The processing procedure from step S202 to step S208 is repeated at a constant cycle.

  According to the present embodiment, after the start of writing of detection data, the FAT 4a related to the data file has already been updated, and the data file can always be correctly read from the memory card 4, so the writing of the detection data to the data file is completed. Even if the system goes down before the detection, the detection data in the data file can be read, and the reliability in collecting measurement data can be improved.

  In addition, since the completion file is downloaded at a constant cycle and the downloaded completion file on the memory card 4 is automatically deleted, it is possible to prevent the memory card 4 from overflowing.

  In the present embodiment, the example in which the data file downloaded from the measurement data collection device 1 by the information processing terminal 8 is stored in the storage unit 56 has been described, but the present invention is not limited to this. For example, when the data file generation unit 15 of the measurement data collection device 1 generates a data file as a binary file, the data file acquired by the information processing terminal 8 is converted into a predetermined text format (CSV: Comma Separated Value, etc.). You may make it provide a file format conversion means.

Embodiment 2. FIG.
In this embodiment, when the file management control unit 16 of the measurement data collection device 1 fails to store the data file 4c, overflow warning information of the memory card 4 is generated, and the information processing terminal 8 is based on this warning information. Will send an email.

  The measurement data collection device 1 includes warning information generation means for generating overflow warning information when the file management control unit 16 fails to store the data file 4c, and the information processing terminal 8 receives from the measurement data collection device 1 A mail transmission means for transmitting an electronic mail based on the overflow warning information is provided.

  When the replacement of the dummy data by the detection data in a certain data file is completed, the data file generation unit 15 of the measurement data collection device 1 generates a data file as a spare file in addition to the data file to which the detection data is to be written next. . The warning information generation means generates overflow warning information when the spare file cannot be stored in the memory card 4. That is, it is possible to determine whether or not an overflow occurs in the memory card 4 depending on whether or not a spare file can be stored in addition to the data file being written.

  Steps S301 to S310 in FIG. 9 are flowcharts showing an example of data collection operation in the measurement data collection apparatus in FIG. First, if the detection data is input from the A / D conversion unit 12, the file data replacement control unit 13 instructs the data file generation unit 15 to generate a data file (steps S301 and S302).

  Next, the file management control unit 16 updates the FAT 4a on the memory card 4 and determines whether or not the data file can be stored on the memory card 4 (steps S303 and S304). If the data file can be stored, the data file and the updated FAT 4a are stored in the memory card 4 (step S305).

  The file data replacement control unit 13 sequentially replaces the dummy data in the data file with the detection data input from the A / D conversion unit 12 (steps S306 and S307). The file data replacement control unit 13 instructs the data file generation unit 15 to generate a new data file when the replacement by the detection data is completed and the detection data is further input.

  On the other hand, when the data file cannot be stored on the memory card 4, the overflow warning information is generated by the warning information generation means (step S308). At this time, the communication control unit 18 transmits overflow warning information to the information processing terminal 8 in response to an overflow occurrence inquiry from the information processing terminal 8 (steps S309 and S310).

  Steps S401 to S404 in FIG. 10 are flowcharts showing an example of alarm mail transmission operation in the information processing terminal in FIG. First, the communication control unit 52 generates an overflow inquiry at a constant period and transmits it to the measurement data collection device 1 (step S401).

  Next, when the overflow warning information from the measurement data collection device 1 is received (step S402), the communication control unit 52 sends an e-mail (alarm mail) for notifying the occurrence of an overflow according to the setting content by the user. Generated and transmitted to the measurement data collection device 1 (steps S403, S404).

  According to the present embodiment, even when the reserve file cannot be stored in the memory card 4 because the storage area that can be stored is smaller than the file size, the data to which the detection data is to be written next Detection data can be written to the file. At this time, since the FAT 4a is updated before the start of writing of the detection data to the data file and the file size of the data file is determined, an overflow in the memory card 4 is predicted before the detection data cannot be written to the data file. can do. Further, before the memory card 4 overflows, it can be notified to other terminals by an alarm mail.

It is the figure which showed an example of schematic structure of the measurement data collection system by Embodiment 1 of this invention. It is the block diagram which showed an example of the principal part detail in the measurement data collection system of FIG. It is the block diagram which showed an example of the principal part detail in the measurement data collection system of FIG. It is the figure which showed an example of the data file produced | generated in the measurement data collection device of FIG. It is the state transition diagram which showed an example of the file transfer operation | movement in the measurement data collection system of FIG. It is the state transition diagram which showed an example of the file deletion operation | movement in the measurement data collection system of FIG. 3 is a flowchart showing an operation example as an FTP server in the measurement data collection device of FIG. 2. It is the flowchart which showed the operation example in the information processing terminal of FIG. 3 is a flowchart showing an operation example of data collection in the measurement data collection apparatus of FIG. 2. 4 is a flowchart illustrating an example of an alarm mail transmission operation in the information processing terminal of FIG. 3.

Explanation of symbols

1 Measurement Data Collection Device 2a Measurement Unit 4 Memory Card 4a FAT
4b Completion file 4c Data file 5 Memory unit 6 Display unit 7a, 7b Communication line 7c Communication network 8 Information processing terminal 9 Mail server 11 Input interface 12 A / D conversion unit 13 File data replacement control unit 14 Main control unit 15 Data file generation Unit 16 File management control unit 17 File list generation unit 18 Communication control unit 19 Display control unit 20 LCD
20a Display screen 21 Operation input unit 22 ROM
23, 24 RAM
25 card slot

Claims (9)

Measurement data acquisition means for periodically acquiring detection data from the sensor;
Data file generating means for generating a data file composed of dummy data;
An allocation table comprising allocation information relating to the storage area of the data file is read from a rewritable nonvolatile file storage means, and the data file generated by the data file generation means is stored in the file storage means based on the allocation table. The file management means for writing the allocation information relating to the storage area of the data file to the allocation table and storing it in the file storage means;
File data replacing means for accessing the file storage means based on the detected data and sequentially replacing dummy data in the data file in which the allocation information is written in the allocation table with the detected data; Data collection device. A file list generating means for listing a data file for which dummy data is replaced by detected data as a completed file and generating a completed file list;
The measurement data collection device according to claim 1, further comprising: a file transmission unit that outputs the completed file list in response to a file list request from an information processing terminal. Rewritable volatile instruction information storage means for storing file instruction information for designating a data file in which allocation information is newly written in the allocation table by the file management means,
The measurement data collection device according to claim 2, wherein the file list generation unit generates a completed file list based on the file instruction information.   The measurement data collection apparatus according to claim 1, wherein the file management unit deletes allocation information related to the data file to be deleted from the allocation table in response to a file deletion request from the information processing terminal.   The data file generation means generates a data file as a spare file in addition to the data file to which the detection data is to be written next after the replacement of the dummy data by the detection data in a certain data file is completed. Item 2. The measurement data collection device according to Item 1.   6. The measurement data collection device according to claim 5, further comprising warning information generation means for generating overflow warning information when said file management means fails to store said spare file. It consists of a measurement data collection device that collects detection data from sensors and stores it in a data file, and an information processing terminal that acquires the data file from the measurement data collection device via a communication line and performs data processing.
The measurement data collection device includes an allocation table including measurement data acquisition means for periodically acquiring detection data from a sensor, data file generation means for generating a data file including dummy data, and allocation information relating to a storage area of the data file. Is read from the rewritable nonvolatile file storage means, the data file generated by the data file generation means is stored in the file storage means based on the allocation table, and the allocation information relating to the storage area of the data file is allocated. File management means for writing to the table and storing it in the file storage means, and data in which the allocation information is written in the allocation table by accessing the file storage means based on the detection data Measurement data collection system characterized by and a file data replacement means for sequentially replacing the dummy data in Airu the detected data. The measurement data collection device generates a data file as a spare file in addition to the data file to which the detection data is to be written next when the data file generation unit finishes replacing the dummy data with the detection data in a certain data file. And warning information generating means for generating overflow warning information when the file management means fails to store the spare file,
8. The measurement data collection system according to claim 7, wherein the information processing terminal includes a mail transmission unit that transmits an electronic mail based on overflow warning information from the measurement data collection device. The information processing terminal includes file format conversion means for converting the acquired data file into a predetermined text format,
8. The measurement data collection system according to claim 7, wherein the data file generation means of the measurement data collection device generates the data file as a binary file.

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