JPH02146093A - Trend display device - Google Patents

Abstract

PURPOSE:To make a trend display without distorting original waveform variation by extracting data on a maximum and a minimum value in a specific number of successive data, and displaying the data on the maximum and minimum values in the order of the data extraction while changing their X-axial coordinate positions. CONSTITUTION:A data thinning-out means 3 extracts two data on the maximum and minimum value in the specific number of data in time-series order as to all trend data according to display time width. A trend data generating means 4 generates data for displaying the data on the maximum and minimum values in the order of the data extraction while changing their X-axial coordinate positions and the trend data are displayed on a display means 5. Consequently, the trend display is made without distorting the waveform of the trend data.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a trend display device that displays data collected at regular intervals as a trend. 1 - Relating to a rend display device.

(Prior Art) A trend display device that displays a large amount of data collected at regular intervals on a display means such as a CRT is as follows:
It is conventionally known.

Such a trend display device displays a large amount of data collected over several hours, with the X axis as the time axis, and when displaying a large amount of data collected over a long period of time on one screen at once, the data In addition to thinning out the data, the time axis is also reduced and displayed in a way that allows the overall trend of the data to be grasped.

FIG. 5 is a diagram for explaining the filtration of trend display in a conventional device.

(a) is a diagram in which data collected over a certain period of time T is displayed on the entire screen, and (b) is a diagram in which such data can be displayed with three times the amount of data by reducing the time axis to, for example, 1/3. That's what I do.

In this case, in (a), for example, three pieces of data such as interval TI, interval T2, interval T3, etc. are extracted, and the maximum data and minimum data are extracted among these data, and (b) As shown in Figure 2, the maximum value and minimum value of each section group were displayed at the same X-coordinate position in sequence using a vertical line segment connecting them.

(Problems to be Solved by the Invention) Conventional devices that perform such trend display display the outline of the waveform representing the change in the overall data shown in (a),
This is effective in that it allows you to intuitively grasp changes in data, but it has the problem that it requires special explanation because it differs from normal trend display.

The present invention was made in view of these problems, and
The purpose is to realize a display device that can display a trend in a manner that faithfully reproduces changes in the original data without distorting the waveform of the trend data to be displayed using a simple configuration.

(Means for solving problems) FIG. 1 is a basic configuration block diagram of the present invention.

In the figure, 1 is a trend data holding means for holding trend data to be displayed, 2 is a display time width input means for inputting data related to the display time width, and 3 is related to the display time width from the trend data holding means 1. sequentially reads out a predetermined number of continuous data corresponding to the data to be read, and
A data thinning means 4 extracts data of the maximum value and minimum value among this predetermined number of data, and numeral 4 indicates the data of the maximum value and minimum value thinned out by this data thinning means 3 on the X-axis coordinate in the order of data extraction. 5 is a trend data creation section that creates trend data to be displayed sequentially by changing the position; and 5 is a display section that displays this trend data.

(Operation) FIG. 2 is a diagram for explaining the operation of trend display by the apparatus of the present invention.

For all the trend data displayed as shown in FIG. The trend data creation means 4 extracts the maximum value and minimum value data in the order of data extraction.
Data to be displayed sequentially is created by changing the axis coordinate position, and trend data as shown in (b) is displayed on the display means 5.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a configuration diagram showing one embodiment of the present invention. In the figure, 10 is a control station installed in the field, and 11 is a trend data collection means for collecting data to be trended from the control station 10. The trend data collected here is, for example, trend data such as a magnetic disk. It is stored in the holding means 1.

Reference numeral 20 denotes a microprocessor, which functions anonymously as a trace data thinning means 3 and a trend data creation section 4 according to a program.

50 is a keyboard, and 51 is a soft key means such as a touch screen or a mouse, which function as the display time width input means 2, through which the operator operates to specify the display time width and input data for the song. . The display unit 5 uses a display means such as a CRT.

The operation of the device configured as described above will be explained next.

FIG. 4 is a conceptual diagram showing the flow of data displayed on the display section 5. As shown in FIG. As shown in (a), the trend data holding means 1 stores data 1 to 1440 (here, a case where 1440 points of data are stored) collected by the trend data collection means 11 at regular intervals is stored. Stored in chronological order.

The data thinning means 3 reads data of, for example, six consecutive points in time series as one group according to the display time width data instructed from the keyboard 50 or the soft key means 51, and selects the maximum value in this group. The data (data 2 for group 1, data 9 for group 2) and the minimum value data (data 4 for group 1, data 12 for group 2) are thinned out.

Here, when the specified display time width is large, the number N of data that the data thinning means 3 reads out as one group from the trend data holding means 1 becomes more than the six shown here, and conversely, the display time When the width is small, the number N of data read out as one group is small. In this manner, the data thinning means 3 performs an operation of thinning out the data from the trend data holding means 1 to a number equal to 2/H in response to an instruction from the display time width inputting means 2.

The trend data creation unit 4 displays the thinned out maximum value data and minimum value data at adjacent X coordinate positions, and creates trace data connecting the two. The display unit 5 receives trace data from the trend data creation unit 4,
As shown in (b), groups of data 1435 to data 1440 are sequentially displayed.

When displaying trend data like this, the data is thinned out by leaving the maximum and minimum points in a certain interval, so the shapes of the maximum and minimum are left, and the original waveform can be reproduced without distortion. It becomes possible to do so.

If there is a surplus of data, add it to the last group and extract the maximum and minimum values among them.

(Effects of the Invention) As will not be described in detail above, according to the present invention, from the trend data of all data, the time axis is adjusted by 1.6 to a desired display time width without distorting the original waveform change. Shrink it,
Trends can be displayed.

[Brief explanation of the drawing]

Figure 1 is a basic configuration block diagram of the present invention, Figure 2 is a diagram for explaining the invention in detail, Figure 3 is a configuration block diagram showing an embodiment of the present invention, and Figure 4 is a display. FIG. 5 is a conceptual diagram showing the flow of data displayed in the section. FIG. 5 is a diagram for explaining the concept of trend display in the conventional device. Figure 1: Trend data holding means, 2: Display time width input means, 3: Data thinning means, 4: Trend data creation section, 5: Second display section
Figure Tsu funeral map

Claims (1)

[Claims] Trend data holding means for holding trend data to be displayed; display time width inputting means for inputting data related to the display time width; a data thinning means for sequentially reading out a predetermined number of continuous data corresponding to the data and extracting maximum value and minimum value data from the predetermined number of data; and a maximum value thinned out by the data thinning means. A trend display device comprising: a trend data creation unit that creates trend data that sequentially displays data of the minimum value by changing the X-axis coordinate position in the data extraction order; and a display unit that displays the trend data.