JP2021009644A - Display apparatus and display method - Google Patents

Abstract

To provide a display apparatus and a display method which can display a trend graph indicating more detailed temporal change of measured values.SOLUTION: The present invention is directed to a display apparatus for displaying, by using a trend graph, temporal change in measured values obtained by measurement of measured values of a monitoring object during an object monitoring period in which a monitor monitors the object through a screen. The display apparatus has a display unit and a generation control unit. The display unit displays a single trend graph by using a predetermined number of pixels . The generation control unit divides the object monitoring period into a plurality of periods and generates a trend graph indicating the temporal change in measured values measured during the respective plurality of periods by using measured values of the count equal to the predetermined number. The generation control unit controls the display unit to display the trend graph indicating the temporal change in measured values measured during the respective plurality of periods by using the predetermined number of pixels.SELECTED DRAWING: Figure 4

Description

The present invention relates to a display device and a display method for displaying a trend graph.

Conventionally, when monitoring the state of a monitored area such as a plant, a display device that displays a trend graph showing a temporal transition of measured values measured in the monitored area has been used (for example, the following). See Patent Document 1). The trend graph is a graph in which the measurement time of the measured value in the monitoring target period (monitoring target period) is associated with the measurement value, and the measured value acquired at each measurement time in the monitoring target period is displayed. By showing, the temporal transition of the measured value during the monitoring target period is shown. The monitoring target period is often predetermined according to the processing content in the monitored area, but it is often long. On the other hand, the time between the measurement time and the next measurement time is often short.

If more of the measured values can be used when the display device generates a trend graph using the measured values measured over the monitored period, the trend graph will be more detailed in time of the measured values. Can show changes. Then, by using such a trend graph, the observer can perform more accurate monitoring.

Japanese Patent No. 6145304

However, there is a limit to the number of pixels (number of pixels) on the screen displaying the trend graph. For this reason, the display device thins out a part of many measured values that have been measured in a short span over a long period of time according to the number of pixels when generating the trend graph displayed on the screen. There were many things I had to do. As a result, the display device generated and displayed a trend graph using only the measured values that were not thinned out. As a result, in the monitoring of the monitored area during the monitored period, the occurrence of an event that the observer needs to detect is often overlooked. In addition, when the observer wants to collectively monitor the measured values over a long period of time while not overlooking the occurrence of an event, the observer changes the time width of the trend graph to make it long-term and short-term. It was necessary to display and monitor the trend graph of each time width between them while switching on the screen, and the monitoring process was often complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a display device and a display method capable of displaying a trend graph showing a more detailed temporal change of a measured value. ..

The display device according to the present invention determines the temporal transition of the measured value of the monitored object, and the temporal transition of the measured value measured in the monitored period, which is the period for which the observer monitors on one screen. A display device that displays using a trend graph, the display unit that displays one trend graph and the monitoring target period are divided into a plurality of periods by using a predetermined number of pixels. The trend graph showing the temporal transition of the measured value in each of the periods of is generated by using the number of the measured values equal to the predetermined number, and using the predetermined number of pixels, A generation control unit that controls the display unit is provided so as to display the trend graph showing the temporal transition of the measured value in each of the plurality of periods.

The display method according to the present invention determines the temporal transition of the measured value of the monitored object, and the temporal transition of the measured value measured in the monitored period, which is the period for which the observer monitors on one screen. A display method executed by a display device that displays using a trend graph, wherein the display device displays one trend graph using a predetermined number of pixels, and the display method is the display method. The step of dividing the monitored period into a plurality of periods and the trend graph showing the temporal transition of the measured values in each of the plurality of periods are obtained by using the same number of the measured values as the predetermined number. It includes a step of generating and a step of displaying the trend graph showing the temporal transition of the measured value in each of the plurality of periods using the predetermined number of pixels.

According to the display device and the display method according to the present invention, the generation control unit divides the monitoring target period into a plurality of periods. The monitoring target period is a period during which the monitor monitors the temporal transition of the measured value of the monitoring target on one screen. The display unit displays one trend graph using a predetermined number of pixels. The generation control unit generates a trend graph showing the temporal transition of the measured values in each of the plurality of periods by using the number of measured values equal to the predetermined number. Then, the generation control unit controls the display unit so as to display a trend graph showing the temporal transition of the measured value in each of the plurality of periods by using a predetermined number of pixels. As a result, it is possible to display a trend graph showing more detailed changes over time of the measured values without thinning out the information of the measured values displayed on the screen.

It is a figure which illustrates the functional block of the display device which concerns on embodiment, and the monitoring control system including the display device. It is a figure which shows an example of the trend graph displayed on the screen. It is a figure which shows the screen example which includes a plurality of trend graphs in an embodiment. It is a flowchart which illustrates the display process executed by the display device which concerns on embodiment.

Embodiment.
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a diagram illustrating a functional block of a display device according to an embodiment and a monitoring control system including the display device. The monitoring control system 1 includes a control system 2, a storage device 3, and a display device 4. The control system 2 and the storage device 3 are connected by wire or wirelessly. Further, the storage device 3 and the display device 4 are connected by wire or wirelessly.

The control system 2 is, for example, a system in a plant or the like, and includes a plurality of devices 20 to be controlled, a plurality of measuring devices 21, and one or more control devices 22. The device 20 is a device such as a stirrer or a valve. The measuring device 21 is a device such as a flow meter, a pressure gauge, or a thermometer, and measures a flow rate value, a pressure value, a temperature value, or the like to be monitored at an installation location, a measurement target location, or the like. The control device 22 controls one or more devices 20 and acquires a measured value and a time (measurement time) at which the measured value is measured from the one or more measuring devices 21.

The storage device 3 accumulates and stores the measured value acquired by the control device 22 from the measuring device 21 and the time when the measured value is measured. The control device 22 may store the measured value and the measured time in the storage device 3, and the storage device 3 acquires the measured value and the measured time from the control device 22 based on the instruction of the display device 4 described later. You may. The storage device 3 may be included in the display device 4 below.

The display device 4 is a device used by the observer when monitoring the monitoring target in the control system 2. The display device 4 according to the embodiment is, for example, a terminal device such as a PC (Personal Computer) or a WS (Workstation). The display device 4 acquires each measurement time of each measurement device 21 and the measured value measured by each measurement device 21 at each measurement time from the storage device 3 in a specific or arbitrary period. When the observer monitors the measured value by each measuring device 21 by visually recognizing one screen, the display device 4 changes the measured value over time in the period to be monitored (monitored period). Generate a trend graph showing.

FIG. 2 is a diagram showing an example of a trend graph displayed on the screen. The trend graph includes a time axis showing the monitoring target period, and shows the measured value measured at the measurement time on the time axis. The trend graph shown in FIG. 2 shows the measured values measured at each of the plurality of measurement times from the time "00:00" to the time "24:00". In FIG. 2, the horizontal axis represents the time axis and the vertical axis represents the measured value. The display device 4 displays such a trend graph on the screen, and the observer monitors the temporal transition of the measured value by referring to the trend graph displayed by the display device 4.

Return to reference in FIG. The display device 4 includes a communication unit 40, a generation control unit 41, a display unit 42, and an input unit 43. The communication unit 40 communicates with the storage device 3, and from the storage device 3, each measurement time of each measurement device 21 and each measurement device at each measurement time in a specific or arbitrary period such as a monitoring target period Acquire the measured value and the measured value. The generation control unit 41 controls the communication unit 40, the display unit 42, and the like. The generation control unit 41 generates a trend graph based on the measurement time and the measured value acquired by the communication unit 40 from the storage device 3. The display unit 42 displays the trend graph generated by the generation control unit 41 on the screen. The display unit 42 displays one trend graph using a predetermined number of pixels.

The input unit 43 receives an input of an instruction from the observer. The instruction in the embodiment includes an instruction to specify or change the monitoring target period, an instruction to specify or change the length of the monitoring target period, and the like. Further, the instruction in the embodiment includes an instruction to specify or change the latest time or the oldest time in the trend graph displayed on one screen.

When the generation control unit 41 receives an instruction to specify or change the monitoring target period via the input unit 43, the generation control unit 41 shows a trend graph showing the temporal transition of the measured value measured in the monitoring target period in response to the instruction. To generate. Further, when the generation control unit 41 receives an instruction to specify or change the length of the monitoring target period via the input unit 43, the measurement value measured in the monitoring target period of the length corresponding to the instruction. Generate a trend graph showing the temporal transition of. Furthermore, when the generation control unit 41 is instructed to specify or change the latest time of the time axis in the trend graph displayed on one screen via the input unit 43, the generation control unit 41 receives the latest time in response to the instruction. Generate a trend graph showing the temporal transition of previously measured values. Similarly, when the generation control unit 41 receives an instruction to specify or change the oldest time on the time axis in the trend graph displayed on one screen via the input unit 43, the generation control unit 41 responds to the instruction most. Generate a trend graph showing the temporal transition of measured values measured after the old time.

The generation control unit 41 temporarily sets each measurement time of each measurement device 21 acquired from the storage device 3 in a specific or arbitrary period and the measurement value of each measurement device 21 measured at each measurement time. Remember. Then, the generation control unit 41 generates a trend graph based on the measurement time in the monitoring target period and the measured value measured at the measurement time.

The trend graph shown on the conventional display device does not always show all the measured values acquired from the storage device 3. This is because the number of measured values measured at each measurement time in the monitoring target period is often enormous, but the number of pixels (number of pixels) on the screen of the display device is limited. This is because some measurements are not used in the generation of.

The measured value is often measured in a short cycle such as 0.1 second, 1 second, or 1 minute. In addition, the monitoring target period is often a long period such as 24 hours, 1 month, or 365 days. For this reason, the number of measured values over the monitored period is often enormous. Since the number of measured values is larger than the number of pixels, the conventional display device thins out some of the measured values and generates a trend graph from the remaining measured values when displaying the trend graph. .. For example, when the number of pixels on the screen is 1000 and the number of measured values measured during the monitoring target period is 3000, the number of measured values shown in the trend graph on the screen is at most 1000. Become.

However, when the display device thins out the measured values when displaying the trend graph, the following problems may occur. For example, if the thinned out measured value is an abnormal value measured only for a moment and no abnormality is found in the measured value before and after the measurement of the abnormal value, the observer While checking the trend graph, there is a possibility of overlooking an abnormality in the monitored system. In addition, if the thinned-out measured value indicates the occurrence of an event and is measured only for a moment, and the occurrence of the event cannot be read from the measured values before and after that, the observer It is possible to overlook the occurrence of an event while referring to the trend graph.

If the observer wants to grasp the time transition of the measured value in detail, it is desirable that the trend graph displayed on the screen is generated by using more measured values. In order to solve such a problem, the display device 4 in the embodiment has the following configurations and functions. The generation control unit 41 divides the monitoring target period into a plurality of periods. The generation control unit 41 generates a trend graph showing the temporal transition of the measured value in each of the plurality of periods. That is, the generation control unit 41 generates a plurality of trend graphs, each of which shows a temporal transition of the measured value in each of the plurality of periods. At that time, the generation control unit 41 allocates a predetermined number of pixels used by the display unit 42 when displaying one trend graph in each generation of the plurality of trend graphs. Then, the generation control unit 41 generates each of the plurality of trend graphs by using the number of measured values equal to the predetermined number (number of pixels). In this case, when a plurality of trend graphs are generated, the number of measured values divided by the number of measured values used when displaying only one trend graph showing the temporal transition of the measured values in the monitored period is generated. Used for. Then, the generation control unit 41 controls the display unit 42 so that each of the plurality of trend graphs is displayed using a predetermined number of pixels. In this case, the number of pixels divided by the number of pixels used when displaying only one trend graph showing the temporal transition of the measured value in the monitoring target period is used when displaying a plurality of trend graphs. Be done.

Then, the generation control unit 41 makes sure that the time axes of each of the generated trend graphs are parallel to each other on the screen and that the plurality of trend graphs are arranged in the direction perpendicular to the time axis on the screen. The display unit 42 is controlled so as to display a plurality of trend graphs. As a result, more measured values are displayed on the screen, and the observer can grasp the temporal change of the measured values in the monitored period in more detail.

FIG. 3 is a diagram showing a screen example including a plurality of trend graphs in the embodiment. In this example, the generation control unit 41 performs 24 hours from the time "00:00" to the time "24:00", which is the monitoring target period, and from the time "00:00" to the time "12:00". It is divided into two periods, 12 hours and 12 hours from the time "12:00" to the time "24:00". The trend graph including the time axis of the period from the time "0:00" to the time "12:00" shows the temporal transition of the measured value in the period. Similarly, the trend graph including the time axis of the period from the time "12:00" to the time "24:00" shows the temporal transition of the measured value in the period. The number of measured values used in creating the trend graph in this example is twice the number of measured values used when generating one trend graph showing the temporal change of the measured values during the monitored period. ..

The mark 45A displayed together with the trend graph in FIG. 3 is for causing the display device 4 to display the trend graph in the next monitoring target period by designating the mark 45A by the observer using a mouse or the like. It is a mark of. When the mark 45A is specified on the screen shown in FIG. 3, the display device 4 displays the trend graph in the period from the time "0:00" to the time "12:00" on the next day and the time "12: 00". The trend graph in the period from "00" to the time "24:00" is displayed on the screen in the format shown in FIG.

The mark 45B in FIG. 3 is a mark for causing the display device 4 to display the trend graph in the immediately preceding monitoring target period by designating the mark 45B using a monitor, a mouse, or the like. When the mark 45B is specified on the screen shown in FIG. 3, the display device 4 displays the trend graph in the period from the time "00:00" to the time "12:00" on the previous day and the time "12: 00". The trend graph in the period from "00" to the time "24:00" is displayed on the screen in the format shown in FIG.

In the above example, the generation control unit 41 divides the monitoring target period into two periods and generates a trend graph in each period, but the number of divisions is not limited to 2, for example, 3 or more. Good. For example, when the number of divisions is 3, the generation control unit 41 generates a trend graph for each of the three periods included in the monitored period. At this time, the generation control unit 41 measures with three times the number of pixels and the number of each of the measured values used when generating one trend graph showing the temporal change of the measured value in the monitoring target period. Use the value and. The display unit 42 displays the three trend graphs generated by the generation control unit 41 so that their time axes are parallel to each other and the three trend graphs are arranged in a direction orthogonal to the time axis.

The number of divisions of the monitoring target period may be determined by the observer. In this case, the observer inputs the number of divisions via the input unit 43. The generation control unit 41 divides the monitoring target period based on the number of divisions, and generates a trend graph in each of the plurality of divided periods. Further, the number of divisions may be determined by the generation control unit 41 based on the number of pixels and the number of measured values.

The number of measured values measured at each measurement time during the monitoring target period may be less than or equal to the number of pixels. In this case, there is no need to divide the monitoring target period. Since such a case may occur, the generation control unit 41 divides the monitoring target period when the number of measured values measured at each measurement time in the monitoring target period is larger than a predetermined threshold value. If it is equal to or less than the threshold value, the monitoring target period may not be divided. The threshold value may be the number of pixels allocated for displaying the trend graph in the time axis direction of the trend graph. The generation control unit 41 may determine whether or not the number of measurements in the monitoring target period is equal to or less than the threshold value, not the number of measured values.

The display device 4 according to the embodiment includes, for example, a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit), a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), and a keyboard. It can be configured by using an input device such as a mouse or a touch panel, a display device such as a liquid crystal display, an EL (Electroluminescence) display, or a CRT (Cathode Ray Tube) display, and a communication interface circuit or the like. The function of the communication unit 40 can be realized by a communication interface circuit. The function of the display unit 42 can be realized by the display device. The function of the input unit 43 can be realized by an input device. The function of the generation control unit 41 can be realized by the processor reading and executing various programs stored in the memory. The display device 4 may use all or part of the display device 4 as dedicated hardware.

FIG. 4 is a flowchart illustrating the display process executed by the display device according to the embodiment. In step S1, the input unit 43 receives the designation of the measured value by the measuring device 21 to be monitored and the monitored period of the measured value by the input from the observer. In step S2, the generation control unit 41 divides the monitoring target period into a plurality of periods. In step S3, the generation control unit 41 measures the number of pixels doubled by the number of divisions of the number of pixels allocated when showing the measured value measured in the monitored period in one trend graph in each of the plurality of periods. Allocate to generate a trend graph showing the measured values.

In step S4, the generation control unit 41 generates a trend graph showing the temporal transition of the measured values measured in each of the plurality of periods. The generation control unit 41 determines whether or not the number of measured values measured during the monitoring target period is equal to or less than the threshold value after step S1 and before step S2, and if the number is larger than the threshold value, step S2. Subsequent processing may be performed. In the case of making such a determination, if the number is equal to or less than the threshold value, the generation control unit 41 may move the process to step S5. In step S5, the generation control unit 41 controls the display unit 42 so as to display the generated plurality of trend graphs on the screen.

The display device 4 according to the embodiment is a display device 4 that displays the temporal transition of the measured value measured in the monitoring target period by using a trend graph. The monitoring target period is a period during which the monitor monitors the temporal transition of the measured value of the monitoring target on one screen. The display device 4 includes a display unit 42 and a generation control unit 41. The display unit 42 displays one trend graph using a predetermined number of pixels. The generation control unit 41 divides the monitoring target period into a plurality of periods. The generation control unit 41 generates a trend graph showing the temporal transition of the measured values in each of the plurality of periods by using the number of measured values equal to the predetermined number. Then, the generation control unit 41 controls the display unit 42 so as to display a trend graph showing the temporal transition of the measured value in each of the plurality of periods by using a predetermined number of pixels. As a result, it is possible to display a trend graph showing more detailed changes over time of the measured values without thinning out the information of the measured values displayed on the screen.

In the generation control unit 41 of the embodiment, the trend graph showing the temporal transition of the measured value in each of the plurality of periods has the time axes representing the periods parallel to each other on the screen, and the plurality of the trend graphs are displayed. The display unit 42 is controlled to display the plurality of trend graphs so as to be arranged in a direction perpendicular to the time axis on the screen. As a result, the display device 4 can accurately display the trend graph, which leads to improvement in visibility, while saving the display area on the screen.

The display device 4 according to the embodiment specifies or changes the monitored period, specifies or changes the length of the monitored period, or specifies or changes at least one of the start time and the end time of the monitored period. An input unit 43 for receiving is further provided. The generation control unit 41 generates a trend graph showing the temporal transition of the measured value in each of the plurality of periods based on the monitoring target period in the instruction received by the input unit 43. As a result, the observer can freely switch the monitoring target period, and can monitor the temporal transition of the measured value in the target period.

The display device 4 according to the embodiment further includes an input unit 43 that receives an input of the number of divisions of the monitoring target period. The generation control unit 41 divides the monitoring target period based on the number of divisions input to the input unit 43. As a result, the observer can monitor the temporal change of the measured value in the monitored period in more detail.

The generation control unit 41 in the embodiment sets the monitoring target period when the number of measured values measured during the monitoring target period or the number of measurement times for measuring the measured values is larger than a predetermined threshold value. Divide into multiple periods. As a result, it is possible to reduce unnecessary division processing when it is not necessary to divide the monitoring target period.

The plurality of periods in the embodiment are two or three periods. This improves the visibility of the trend graph by the observer.

1 monitoring control system, 2 control system, 3 storage device, 4 display device, 20 devices, 21 measuring device, 22 control device, 40 communication unit, 41 generation control unit, 42 display unit, 43 input unit.

Claims (7)

A display that displays the temporal transition of the measured value of the monitored object using a trend graph in the monitored period, which is the period for which the observer monitors the measured value on one screen. It ’s a device,
A display unit that displays one trend graph using a predetermined number of pixels, and
The monitoring target period is divided into a plurality of periods, and the trend graph showing the temporal transition of the measured values in each of the plurality of periods is generated by using the number of the measured values equal to the predetermined number. A generation control unit that controls the display unit to display the trend graph showing the temporal transition of the measured value in each of the plurality of periods using the predetermined number of pixels.
A display device comprising. The generation control unit
The time axis representing the period of the trend graph showing the temporal transition of the measured value in each of the plurality of periods is parallel to each other on the screen, and the plurality of trend graphs have the time axis on the screen. The display device according to claim 1, wherein the display unit is controlled so as to display the plurality of trend graphs so as to be arranged in a direction perpendicular to the above. The display device is
Further provided with an input unit that receives an instruction to specify or change the monitoring target period, specify or change the length of the monitoring target period, or specify or change at least one of the start time and the end time of the monitoring target period.
The generation control unit
The first or second aspect of the present invention, wherein the trend graph showing the temporal transition of the measured value in each of the plurality of periods is generated based on the monitored period in the instruction received by the input unit. Display device. The display device is
Further provided with an input unit that accepts the input of the number of divisions of the monitoring target period.
The generation control unit
The display device according to any one of claims 1 to 3, wherein the monitoring target period is divided based on the number of divisions input to the input unit. The generation control unit
When the number of the measured values measured during the monitored period or the number of measured times at which the measured values are measured is larger than a predetermined threshold value, the monitored period is divided into the plurality of periods. The display device according to any one of claims 1 to 4. The display device according to any one of claims 1 to 5, wherein the plurality of periods are two periods or three periods. A display that displays the temporal transition of the measured value of the monitored object using a trend graph in the monitored period, which is the period for which the observer monitors the measured value on one screen. The display method performed by the device,
The display device is
A predetermined number of pixels is used to display one of the trend graphs.
The display method is
A step of dividing the monitored period into a plurality of periods, and
A step of generating the trend graph showing the temporal transition of the measured values in each of the plurality of periods using the number of the measured values equal to the predetermined number, and
A step of displaying the trend graph showing the temporal transition of the measured value in each of the plurality of periods using the predetermined number of pixels.
Display method including.

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