JP3551341B2 - Data collection device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a device for transmitting and receiving data between a data collection device that records measurement data and a data processing device that performs mathematical analysis on the data, and particularly between a plurality of devices when collecting data at a fixed time. Regarding the correction of the time shift that occurs.
[0002]
[Prior art]
As disclosed in Japanese Patent Application Laid-Open No. Sho 64-10392 proposed by the present applicant, there is disclosed a technique for identifying time-series data in a data collection section based on a time at which a trigger signal is input. ing. In addition, in order to collect data at a stable fixed cycle, the data collection device such as a recorder has a timer function, and the data processing device such as a personal computer receives the collected measurement signals and creates a file or graph. A system for sharing functions such as conversion is employed for product development.
[0003]
[Problems to be solved by the invention]
In this case, the built-in timer of the data collection device may cause a time difference between the timer of another data collection device and the timer of the data processing device, and the time difference may become significant over time, There was a problem of giving an error to the punctuality of the measurement time. The present invention solves the problems described above, even if misalignment occurs at the time indicated by the timer built in the data collection device, by the row Ukoto time correction timer of the data processing apparatus, data processing apparatus It is an object of the present invention to provide a data collection device capable of collecting a measurement signal at an accurate fixed period based on a standard time .
[0004]
[Means for Solving the Problems]
The present invention that achieves the above object is a data collection device having the following configuration.
(1) a signal input unit for inputting a measurement signal from a measuring instrument or a sensor;
An output buffer for temporarily storing the measurement signal taken from the signal input unit as output data,
A communication input / output unit for transmitting output data stored in the output buffer to the data processing device;
A timer for determining a period for taking a measurement signal from the signal input unit;
In the data collection device having an operation of converting the measurement signal into the output data and having a data collection control unit that controls the timing at which the communication input / output unit transmits the output data, the standard time of the data processing device Providing a timer time correction unit that corrects the time of the timer so that they match ,
A data collection apparatus , wherein the time is corrected in a short cycle when high-speed sampling of the measurement signal is performed, and the time is corrected in a long cycle when low-speed sampling is performed .
(2) If the processing time of the time correction processing cannot be ignored compared to the precision of the time required for the standard time, correction is performed according to the processing time. apparatus.
(3) a correction amount register indicating a deviation between a standard time of the data processing device and a time of the timer;
The data collection device according to (1) or (2), wherein the time of the timer is corrected using the value of the correction amount register.
[0005]
[Action]
In the configuration of the present invention, a measurement signal from a measuring instrument or a sensor 10 is converted into output data in a data collection device and transmitted to a data processing device. The timer defines the output data capture cycle. The timer time correction unit 26 corrects the time when the time used by the timer deviates from the standard time on the data processing device side. Thus, the output data fetching period becomes constant with reference to the standard time on the data processing device side.
[0006]
【Example】
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of the present invention. In the figure, a measuring device or a sensor 10 outputs a measurement signal, and for example, in the case of a thermocouple, is an analog signal such as a voltage. The data collection device 20 collects the measurement signals sent from the measuring device or the sensor 10 and transmits the measurement signal to the data processing device 30. The number of channels of the measuring device or the sensor 10 may be one or two or more. . The data processing device 30 analyzes information included in the received measurement signal, and displays time-series data in a format that is easy for the operator to understand, for example, in a trend graph or the like, or grasps the physical state of the measured object. To facilitate.
[0007]
Next, details of the data collection device 20 will be described. The configuration of the data collection device 20 is similar to, for example, the functions of a recorder and an oscillograph. The signal input unit 21 is for inputting a measurement signal sent from a measuring instrument or the sensor 10. For example, if the measurement signal is an analog signal, an AD converter is used to convert the signal into a digital signal. In the case of a channel, a multiplexer may be provided. The output buffer 22 temporarily stores the measurement signal fetched from the signal input unit 10 as output data, and uses a storage medium suitable for temporary storage such as a FIFO (first-in first-out memory). The output data number register 222 registers the number of output data currently stored in the output buffer 22. By comparing the output data number register 222 with the storage capacity of the output buffer 22, the presence / absence of a free area can be easily determined.
[0008]
The communication input / output unit 23 transmits the output data stored in the output buffer 22 to the data processing device 30, and follows a standard data transmission / reception standard such as RS232C. The timer 24 determines a cycle for taking in the measurement signal from the signal input unit 21, and this time is a reference of a sampling cycle for reading in the measurement signal. The data collection control unit 25 performs an operation of converting the measurement signal into output data, and controls a timing at which the communication input / output unit 23 transmits the output data. The content of the calculation may be, for example, a conversion of a voltage value into a physical quantity such as a temperature or a pressure, or a simple calculation of sequentially smoothing the voltage value to remove a noise component. Further, the calculation of the output data conversion of the data collection control unit 25 may be performed in accordance with the cycle determined by the timer 24, or may be performed independently of the timer 24. The timer time correction unit 26 compares the difference between the time of the timer 24 and the standard time of the data processing device 30 and corrects the time of the timer 24 so that the time matches the standard time of the data processing device 30. The data processing device 30 has a standard time generation unit 31 for calibrating the time of the timer 24 of each data collection device at a frequency required for normal measurement.
[0009]
The operation of the device configured as described above will now be described. FIG. 2 is a flowchart of the measurement mode of the data collection device. In the measurement mode, the data collection control unit 25 checks whether there is a free area in the output buffer 22 (S10). If a FIFO memory is used for the output buffer 22, data can be saved easily, but the area that can be temporarily stored is limited. If there is a free area, a measurement signal is fetched from the signal input unit 21 (S11). Then, the captured measurement signal is converted into output data and stored in the output buffer 22 (S12). Then, +1 is added to the output data number register 222 stored in the output buffer 22 (S13), and the measurement of the current cycle is completed (S14).
[0010]
On the other hand, if there is no free area in the output buffer 22, the process ends without taking in the measurement signal (S14). If there is no free area in the output buffer 22, the oldest output data may be rejected, and a data measurement signal may be fetched using the rejected storage area.
[0011]
FIG. 3 is a flowchart illustrating processing of the measurement start command. When the measurement start command is sent from the data processing device 30, the data collection device 20 performs the following processing. First, the output data number register 222 stored in the output buffer 22 is initialized (S20). Then, the timer 24 is activated to start data collection at a fixed period (S21), and ends (S22). It should be noted that the data collection of the individual measurement signals at a fixed period is performed in the above-described measurement mode.
[0012]
FIG. 4 is a flowchart illustrating the processing of the measurement data request command. When the measurement data request command is sent from the data processing device 30, the data collection device 20 performs the following processing. First, the output data stored in the output buffer 22 is sent to the communication input / output unit 23, and then sent to the data processing device 30 (S30). Then, the content of the output data number register 222 is subtracted by an amount corresponding to the transmitted output data number (S31). The process ends (S32).
[0013]
FIG. 5 is a flowchart illustrating a process for correcting the timer time according to the present invention. When the command for the timer time correction process is sent from the data processing device 30, the data collection device 20 performs the following process. First, the timer time correction unit captures the standard time of the data processing device 30 sent from the communication input / output unit 25, and then sets this standard time as the time of the timer 24 (S40). If the processing time of the time adjustment process cannot be ignored compared to the accuracy of the time required for the standard time, a correction corresponding to the processing time is performed. Note that a correction amount register indicating a deviation between the standard time of the data processing device 30 and the time of the timer 24 may be provided, and the time of the timer 24 may be corrected using the value of the correction amount register. Thus, the time of the timer 24 substantially matches the standard time of the data processing device 30 (S41). The date may be used together with the time.
[0014]
FIG. 6 is a flowchart illustrating the processing of the measurement end command. When the measurement end command is sent from the data processing device 30, the data collection device 20 stops the timer 24 (S50). Thus, the periodic data collection ends (S51).
[0015]
Next, the operation as viewed from the data processing device side will be described. FIG. 7 is a flowchart of the data processing device. First, a measurement start command instructing the start of data collection is sent to the data collection device 20 (S60). Then, it is determined whether or not it is the regular timing for correcting the time deviation of the timer 24 of the data collection device 20 (S61). The periodic timing is corrected in a short cycle of about one minute when high-speed sampling is performed by the data collection device 20, and is corrected in a long cycle of about one hour when low-speed sampling is performed. If it is a regular timing, the data processing device 30 sends a command for a timer time correction process to the data collection device 20 (S62).
[0016]
If it is not the regular timing, a measurement data request command is sent to the data collection device 20, and the output data transmitted from the data collection device 20 is received (S63). Then, the data is stored in the storage medium of the data processing device, and the measurement signal is displayed on the screen (S64). It is determined whether a predetermined termination condition is satisfied, and if not completed, the process returns to S61 to continue data collection (S65). If the end condition is satisfied, a measurement end command is sent to the data collection device 20 to end the current data collection (S65).
[0017]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the standard time of the data processing device is transmitted and the high-speed sampling of the measurement signal is performed, the time is corrected in a short cycle and the low-speed sampling is performed. In some cases , the time is corrected in a long cycle, and the time of the timer on the data collection device is corrected by a fixed period, so the measurement signal is collected at an accurate fixed period based on the standard time on the data processing device. There is an effect that can be. Further, even when a plurality of data collection devices are connected to the data processing device, the time of each data collection device is determined to be united, so that the reliability of the measurement time is improved.
According to the second aspect of the present invention, when the processing time of the time correction processing cannot be ignored compared to the precision of the time required for the standard time, the time of the timer is substantially reduced to perform the correction corresponding to the processing time. Coincides with the standard time.
According to the third aspect of the present invention, a correction amount register indicating a deviation between the standard time of the data processing device and the time of the timer is provided, and the time of the timer is corrected using the value of the correction amount register. Thus, the time of the timer matches the standard time.
[Brief description of the drawings]
FIG. 1 is a configuration block diagram showing one embodiment of the present invention.
FIG. 2 is a flowchart of a measurement mode of the data collection device.
FIG. 3 is a flowchart illustrating processing of a measurement start command.
FIG. 4 is a flowchart illustrating processing of a measurement data request command.
FIG. 5 is a flowchart illustrating a process of correcting a timer time.
FIG. 6 is a flowchart illustrating processing of a measurement end command.
FIG. 7 is a flowchart of a data processing device.
[Explanation of symbols]
Reference Signs List 10 measuring instrument / sensor 20 data collection device 21 signal input unit 22 output buffer 23 communication input / output unit 24 timer 25 data collection control unit 26 timer time correction unit 30 data processing device

Claims (3)

A signal input section for inputting a measurement signal from a measuring instrument or a sensor,
An output buffer for temporarily storing the measurement signal taken from the signal input unit as output data,
A communication input / output unit for transmitting output data stored in the output buffer to the data processing device;
A timer for determining a period for taking a measurement signal from the signal input unit;
A data collection control unit that performs an operation of converting the measurement signal into the output data, and controls a timing at which the communication input / output unit transmits the output data .
In a data collection device having
Providing a timer time correction unit that corrects the time of the timer to match the standard time of the data processing device ,
A data collection apparatus , wherein the time is corrected in a short cycle when high-speed sampling of the measurement signal is performed, and the time is corrected in a long cycle when low-speed sampling is performed . 2. The data collection device according to claim 1, wherein if the processing time of the time correction processing cannot be ignored compared with the accuracy of the time required for the standard time, the correction is performed according to the processing time. Providing a correction amount register representing a deviation between the standard time of the data processing device and the time of the timer,
3. The data collection device according to claim 1, wherein the time of the timer is corrected using the value of the correction amount register.

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