JPH01262418A - Process display device - Google Patents

Abstract

PURPOSE:To improve the accuracy and read easiness of a process quantity by providing a cursor which displays a coordinate of an X coordinate axis on a specified image plane and a digital display means which displays coordinate values of the X and Y axes specified with the cursor. CONSTITUTION:The cursor 24 which specifies the coordinate value of the X axis 21 is displayed on the display picture plane which is displayed graphically with coordinate axes, i.e. the X axis 21 and Y axis 22. Then the cursor move ment keys of a cursor moving means 12 for moving the cursor 24 optionally are provided, and the coordinate value of the X axis 21 specified with the cursor 24 and the coordinate value of the Y axis 22 corresponding to the coordi nate value are displayed on digital display parts 25 and 26. Consequently, when a cursor movement key is pressed, the current value I at each point (t) of time is displayed in order while the cursor 24 moves on a time base, so an operator accurately reads the current value of a graph waveform 23 at a desired point of time through easy operation. Thus, the state of plant facilities, etc., is accu rately grasped to enable efficient operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a process display device that graphically displays process quantities in various plants and the like.

(Prior Art) In various plants, etc., in order to monitor the plant status, for example, a process display device that allocates time to the X axis and process amount to the Y axis and displays the process amount in a graphical waveform on the screen is often used. There is.

Such a screen display is effective for an operator to understand changes in the plant state throughout the displayed section.

(Problem to be Solved by the Invention) On the other hand, when reading the value of the process quantity at any point in time in the displayed graph waveform, it must be read visually from the scale of the graph coordinates displayed on the screen.

In this method, when the operator reads the value on the scale by visual measurement, it takes time and causes a reading error. Furthermore, because it is a visual measurement, each operator may read different values.

Further, when the apparatus displays the process amount in a graph, the graph is not always displayed with high precision due to constraints due to the resolution of the display screen. For this reason, the operation
A negative read value has a larger error than the actual value.

Therefore, when reading process quantity values, it may be possible to enlarge the graph and improve the display accuracy, but even in this case, errors due to visual measurement will not be eliminated, and the operator's operations will be complicated. Become.

As described above, conventional process display devices have the disadvantage that accurate values of process quantities cannot be easily read and plant conditions cannot be accurately grasped.

SUMMARY OF THE INVENTION An object of the present invention is to provide a process display device that eliminates the above-mentioned inconveniences and allows accurate values of process variables to be easily read.

[Structure of the Invention] (Means for Solving the Problems) For this purpose, the present invention specifies the coordinate values of one coordinate axis on a display screen where a graph is displayed using a plurality of coordinate axes such as the X axis and the Y axis. While displaying a cursor to move the cursor, an operating means is provided to arbitrarily move the cursor, and the coordinate values of one coordinate axis designated by the cursor and the coordinate values of other axes corresponding to that coordinate value are digitally displayed. It is characterized by the following.

(Function) The operator can simply move the cursor to the desired coordinate position using the above operating means, and the process quantity will be displayed digitally, making it easy to read the accurate value of the process quantity. It becomes like this.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a block diagram of a process display device according to an embodiment of the present invention. In the figure, measurement data 1 is collected from a plant by a process input device (not shown).

The process input device includes a sensor and an A/D (analog-to-digital) conversion circuit, and every fixed scanning period S,
The measurement signal from the sensor is converted into a digital signal by A/D conversion, and the process amount is collected. Here, the plant amount detected by the sensor is EU (engineering value), and the digital signal is a count value. Measurement data 1 is such count values collected in time series.

The display device 2 displays graphs and characters on the screen, and the graph display means 3 causes the display device 2 to display graphs, data values, etc. on the screen based on the measurement data.

The keyboard 4 is used to perform display operations, and is provided with cursor movement keys 4a and 4b for moving a cursor displayed on the display device 2, as shown in FIG. The pressed key monitoring means 5 detects when the cursor movement keys 4a, 4b are operated, and the pressed key determining means 6 determines which key has been pressed.

The X value increase/decrease means 7 performs calculations for instructing the time t to be displayed on the screen in the X-axis direction on the display device 2.

By the way, in this example, the plant amount, which is the EU value,
Since the measurement data, which is a count value, corresponds to linearity, if the count value is X and the conversion constants are a and b, the value Y of the plant quantity is expressed as Y=a-X+b. The conversion method conversion constant 8 indicates the above formula and constants.

Further, although the plant amount is displayed in the Y-axis direction, the Y value calculation means 9 calculates the EU of the plant amount corresponding to the instructed time t based on the measurement data 1 and according to the conversion method conversion constant 8. It calculates the value.

The X, Y value digital display means 10 displays the above-mentioned EU values at each of the above-mentioned instructed times t on the display device 2.

The cursor movement position determining means 11 determines the cursor position on the display screen corresponding to the above-mentioned time t, and the cursor movement means 12 moves the cursor to the determined position.

With the above configuration, in this embodiment, the current value I of the power supply device is sequentially read at each scanning period S by a process input device (not shown) at every fixed scanning period S. The current value ■ is A/D converted for each sample and stored as a count value in a storage device (not shown) in time series as measurement data 1.

When the operator performs a predetermined graph display operation on the keyboard 4, the graph display means 3 displays the conversion method conversion constant 8.
Accordingly, as shown in FIG. 3, an X-axis 21 indicating the time t at which the process amount was read and a Y-axis 22 indicating the current value ■ are displayed. The X-axis 21 has tmax as the maximum value,
One dot on the screen is the scale of time t corresponding to the scanning period S, and the Y-axis 22 is the scale of the current value {circle around (2)} whose maximum value is Imax.

Further, the graph display means 3 displays the EU of the process amount at each point in time.
Value 1 In this embodiment, a graph waveform 23 and a cursor 24 indicating the current value are displayed. In this process, the graph display means 3 extracts each count value Y' from the beginning of the measurement data 1, and uses the conversion method and conversion constant registered in advance corresponding to the count value Y' to generate a current value that is an EU value. Convert to I. The graph waveform 23 is displayed by repeating this until time tmax at each sampling time and plotting the display address.

Also, at this time, an X to display the time t at the bottom of the screen
An axis digital display section 25 and a Y-axis digital display section 26 for displaying the current (2) are formed.

FIG. 4 shows the operations of each part that are performed in parallel while the above display is being executed. At this time, the pressed key monitoring means 5
The input of a cursor movement request by pressing the cursor movement keys 4a and 4b of 4 is constantly monitored (from process 31 to process 32, and from ``no input'' in process 32 to process 31).

Here, if the operator presses the cursor movement key 4a ("left" in process 32), time t' is calculated by subtracting the scanning period S from the time t indicated by the cursor 24 at that time ( Processing 33). Further, if the cursor movement key 4b is pressed ("right" in process 32), time L' is calculated by adding the scanning period S to time t (process 34).

Next, a process 35) of extracting the current value ■, which is the measurement data corresponding to the time t', from the measurement data 1, the Y value calculation means 9 converts the current value I into the EU value according to the conversion method conversion constant 8. Converting to a current value 1' (process 36) 8 Next, the X, Y value digital display means 10 displays the
, current value 1' are displayed on the X-axis digital display sections 25 and 26 of the display device 2 (processing 37).

As mentioned above, the time t, which is xvJ on the display screen, is 1
The dots correspond to the scanning period S. Here, the cursor movement position determining means 11 calculates the address on X#l of the cursor corresponding to the above-mentioned time t' on the display screen as X=X÷1 (processing 38). Then, the cursor moving means 12 moves the cursor 24 to the address X (
Process 39) After this, the process returns to the initial operation and the same process is executed (proceed to process 31).

As a result, when the operator continues to press the cursor movement keys 4a and 4b, the cursor 24 moves in the direction indicated by the arrow.
gradually moves. At this time, at each time point, the time t at the intersection of the cursor 24 and the X-axis 21 is digitally displayed on the X-axis digital display section 25, and the current value I at each time t is displayed on the Y-axis digital display section 26. be done.

As described above, in this embodiment, the cursor movement keys 4a,
4b, the cursor 24 moves on the time axis and displays the current value I at each point in time, allowing the operator to easily determine the current value I of the graph waveform 23 at a desired point in time. Can be read accurately. This makes it possible to accurately understand the status of plant equipment and operate it efficiently.

Next, FIG. 5 shows another embodiment in which graph display information 13 is further prepared in addition to the configuration shown in FIG. In this case, the graph display information 13 is information for displaying the graph waveform by enlarging or reducing it6. For example, when displaying the graph waveform in an enlarged manner, measurement data is collected only every scanning period S at time t. Therefore, the EU value of the process amount to be displayed within the scanning period S is calculated using a predetermined interpolation function. Furthermore, in the case of reduced display, since one dot on the X axis indicating time t no longer corresponds to S, each display time t corresponding to the reduction ratio is calculated.

Then, measurement data corresponding to each display point is extracted and displayed in a predetermined graph.

The graph display information 13 is an arithmetic expression for determining each display time point t corresponding to the interpolation function and reduction ratio.

In this way, by enlarging or reducing the graph waveform and displaying it, the graph waveform can be analyzed in detail and the characteristics of plant equipment etc. can be accurately grasped.

In this embodiment, cursor movement keys 4a and 4b are provided to move the cursor, but it goes without saying that other coordinate specifying devices such as a mouse, trackball, or touch panel may be used.

It goes without saying that the present invention can be similarly applied to other display methods, such as a two-dimensional representation of the X-axis and the Y-axis, or a three-dimensional representation of the graph. Furthermore, the X-axis digital display sections 25 and 26 may not be provided on the same screen as the graph, but may be provided independently.

[Effects of the Invention] As described above, according to the present invention, while a cursor indicating one coordinate value is displayed on a display screen where a graph is displayed using a plurality of coordinate axes, the cursor can be arbitrarily moved. Since a means is provided to digitally display the coordinate value of one coordinate axis indicated by the cursor and the coordinate value of the other axis corresponding to that coordinate value, the operator can move the cursor to the desired position by using the operation means. The process amount is displayed digitally by simply moving it to the coordinate position, making it easy to read the accurate value of the process amount.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a process display device according to an embodiment of the present invention, FIG. 2 is a plan view of cursor movement keys, FIG. 3 is a screen diagram showing an example of a screen display of the display device, and FIG. FIG. 5 is a block diagram of a process display device according to another embodiment. l...Measurement data, 2...Display device, 3.
...Graph display means, 4...Keyboard, 4a,
4b... Cursor movement key, 5... Pressed key monitoring means, 6... Pressed key determining means, 7... X value increase/decrease means, 8... Conversion method conversion constant, 9... Y value calculation means,
10...X, Y value digital display means, 11...Cursor movement position determining means, 12...Cursor movement means, 1
3...Graph display information, 21...X axis, 22...Y
Axis, 23... Graph waveform, 24... Cursor, 25
...X-axis digital display section, 26...Y-axis digital display section. (7317) Agent: Patent Attorney Noriyuki Chika (
8869) Ken Daishimaru Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] In a process display device that displays measured data values in graphs on a screen corresponding to multiple coordinate axes, a cursor displayed on the screen that specifies the coordinate value of one of the coordinate axes and moves the cursor arbitrarily. operating means,
A process display device comprising digital display means for digitally displaying a coordinate value of one coordinate axis specified by D with the cursor and a coordinate value of another axis corresponding to the coordinate value.