JPS58217989A - Crt display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a CRT display device that allows easy viewing of trend graphs.

Conventionally, when displaying a trend graph on a CRT display device, as shown in Fig. 1, pressure is plotted in sequence by sequentially plotting the corresponding vertical data values according to changes in the horizontal time axis T. , I am trying to display a trend graph.

For this reason, when the data value ■ changes greatly with respect to time TK, the plotted points of the pressure are spaced apart as shown in FIG. 2, which has the disadvantage that it is difficult to recognize it as a continuous trend graph. Also.

Since the data ■ is sampled and displayed at the minimum unit time of the time axis T, minute fluctuations HN of the data due to high frequency noise etc. as displayed on the analog trend graph TG shown in Figure 3 are avoided. It also has the disadvantage of not being displayed reliably.

Therefore, the object of the present invention is to provide C) free from the above-mentioned drawbacks.
1. An object of the present invention is to provide a T display device.

This invention will be explained below. This invention relates to a CI horizontal display device, which has a function of displaying a trend graph, and also shows the correspondence between time data and data size of plot data, or the maximum value within each sampling time of plot data. The trend graph is displayed as a bar graph based on the correspondence between values, minimum values, and average values. FIG. 4 is a block configuration diagram showing an embodiment of the present invention, in which an oscillator 1 outputs a clock signal CP of a predetermined frequency, and a processing circuit 2 synchronizes with the clock signal OFK from the oscillator 1 and outputs trend data TV. is input, predetermined processing is performed, and then sent to the trend file update circuit 3. The trend file update circuit 3 queues the data from the processing circuit 2 in a trend file 4 having a queue structure in synchronization with the clock signal CP of the oscillator 1, and sequentially erases data from the oldest data when the queue overflows. I'm going to do it.
The trend data files TFI to TFn filed in the trend file 4 are sent to the trend display circuit 5,
Trends are displayed on the CRT6 screen using par graph memory. Note that the processing circuit allows various processing modes, which will be described later, to be specified from the outside, and the trend data files 'II'FI to 'l'Fn of the trend file 4 also have a queue structure corresponding to this.

In such a configuration, the processing circuit 2 processes time data (T
) and data size V), the trend file 4 contains time data T1~Tr% and corresponding data values V,~■ as shown in Table 1 below. is memorized.

Then, the trend display circuit 5 displays a bar graph connecting two points of the stored trend data files TFI to TFn as shown in Table 1 above. Then, the intermediate point m(1(m(n)
is the point (T111 t vfrl) 'The point (T,, .

It is sequentially displayed as a bar graph connecting the maximum and minimum values, and the last end point is the point (Tn, Vn) and the point (Tn).If each plot point is displayed as a bar graph in this way, from K, CRT 6 For example, a bar graph trend graph 10 as shown in FIG. Because it is done,
The trend graph 10 will be woven as a continuous line.

In the above description, all plot points are displayed as bar graphs, but it is also possible to display them as a mixed plot of bar graphs and dots. That is, the starting point is displayed as a bar graph connecting the point (Tl * Vl) and the point (T1, ■2), and the intermediate point m is displayed as the point (Tm, 7m) and the point (
It is also possible to display a bar graph connecting Tm, 'vrrl+1), the end point as a dot at the point (Tn, Vn), and the start point as a dot at the point (T11■t).
The intermediate point m is the point (Tml■m-1) and the point (T□, vm)
The end point is displayed as a bar graph connecting the points (Tn+ vn−
, ) and the point (Tn, V, ) may be displayed as a bar graph.

On the other hand, as shown in FIG. 6, the process of displaying a trend graph as a bar graph based on the correspondence between the maximum value of the sampling time of the plot data PD, max, the minimum value of Vrrl, and the average value of mode, the processing circuit 2 has a sampling time T as shown in FIG.
Maximum value of plot data PD in □-T□-1--ma
x' minimum value Vln-mI. , find the average value 'm-a,
Each of these data is stored in a trend file 4 via a trend file update circuit 3. Therefore, the contents of the trend file 4'' in this case are as shown in Table 2 below.

When creating a pargraph using the maximum and minimum values within each sampling time, the maximum value V and the minimum value V□-ml are determined for each sampling time.

A trend graph is displayed on the CRT 6 as shown in FIG. 7 using a par graph connecting -max. Also, maximum value within each sampling time■ Minimum value--ml□ and m-m1lX
When displaying a trend graph with l and average value V□1,
As shown in FIG. 8, first, a data range 31 with a width spanning the maximum value and minimum value is displayed, and
The average value (Vr
rl,,, a) 32 is displayed, thereby causing the bar graph garden to be displayed on the CRT 6.

In this way, if a per graph is displayed using a line connecting the maximum and minimum values within each sampling time, the plot points will not be scattered and the graph will look like K< as in the past, and the average value will be displayed. In this case, the weight of the data range displayed as the maximum value and minimum value is displayed, making it easier to recognize the data situation and allowing accurate display of trend graph data.

Note that each calculation of the trend file data described above can also be realized by a computer program.

[Brief explanation of the drawing]

Figure 1 shows an example of a conventional trend graph display.
2 is a diagram showing how plot points are scattered in the conventional method, FIG. 3 is a diagram showing an example of displaying analog trend data, and FIG. 4 is a block diagram showing an embodiment of the present invention. 5 to 8 are diagrams for explaining display examples of trend graphs of the present invention. l... Oscillator, 2... Processing circuit, 3... Trend file update circuit, 4... Trend file, 5...
・Trend display circuit, 6...CRT, 10, 20
, 30...Trend graph. Applicant's agent Yu Yasugata Figure 3

Claims (1)

[Claims] In addition to having the function of displaying trend graphs, the correspondence between time data and data size of plot data,
C) IT disk gray shielding, characterized in that the trend graph is displayed as a bar graph based on the correspondence between the maximum value, minimum value, and average value within each sampling time of the plot data.