JPH08129413A - Process monitoring device - Google Patents

Abstract

PURPOSE: To easily change the magnification of a trend graph by displaying a reference line set parallel to the vertical axis of the graph on a display screen based on an inputted instruction, amplifying the difference between the reference line and the graph of the process data by a magnified graph display means, and displaying the amplified graph data. CONSTITUTION: When a trend graph is amplified and magnified, a processor 30 discriminates whether a reference line mode is selected by the operation of a key input device 20 or not. When the reference line mode is selected, one of plural trend graphs that should be magnified is selected. The time series data on the selected trend graph are read and also a reference line 15 is moved up and down. The reference line value and the magnification (gain) that is changed in sequence by the operations of an up-key 26 and a down-key 27 are inputted to a trend graph data generation part 33 and an image output part 34, the difference between the line 15 and the graph of the process data is amplified, and the graph data which are amplified on the basis of the line 15 are shown on a display device 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process monitoring device for monitoring the state of a process, and more particularly to a process monitoring device suitable for displaying a process trend graph on a display screen.

[0002]

2. Description of the Related Art A conventional process monitoring apparatus is, for example, Hitachi Unitrol EX-1000 series "Operator's Console Operation Manual", pages 96, 97 (1987).
If you want to enlarge a part of the trend graph showing the time series change of the process data displayed on the cathode ray tube display of the process monitoring device,
The absolute value of the process data was multiplied by the scaling factor and then the overall bias value was adjusted to obtain a trend graph display of the desired amplitude. With this method, the plant operator
It was possible to observe and observe minute changes in process data over time, and a trend graph display function effective in plant operation was obtained.

[0003]

However, since the conventional apparatus has a method of multiplying the absolute value of the process data by a scaling factor, if the time series value of the process data is generally high, the scaling factor is multiplied. The graph is out of the screen frame of the CRT display device, and the bias value has to be adjusted to bring it back into the screen display frame, which is a problem in terms of usability. That is, there is a usability problem that a natural operation of appropriately changing the magnification while looking at the currently displayed trend graph cannot be easily executed.

An object of the present invention is to provide a trend graph of process data displayed on a cathode ray tube display device in a process monitoring device, which can be amplified and displayed at an arbitrary magnification so that an operator can easily observe the trend graph, and which is easy to use. To provide a process monitoring device having a magnification changing function.

Another object of the present invention is to select any one of a plurality of process data trend graphs displayed on a cathode ray tube display device in a process monitoring device so that an operator can easily observe it. Another object of the present invention is to provide a process monitoring device that can be amplified and displayed at a magnification of 1 and has a convenient trend graph magnification changing function.

[0006]

In order to achieve the above first object, the present invention provides a data processing means for converting process data sent from a plant into graph data representing a temporal change, and this data. In a process monitoring device having a display means for displaying the graph data converted by the processing means and an input means for inputting desired information to the data processing means, the input means is provided as the desired information of the display means. The position of the reference line displayed on the display screen and the magnification for enlarging the graph of the graph data are input, and the data processing unit displays the display based on the instruction of the position of the reference line input from the input unit. Reference line display means for displaying a reference line parallel to the horizontal axis on the display screen of the means, the reference line displayed on the display screen of the display means and the professional line The difference between the graph of Sudeta is obtained a larger graph display means for displaying the graph data amplified on the basis of the reference line by amplifying, based on an instruction of the magnification inputted from the input means.

In order to achieve the above-mentioned second object, the present invention comprises a data processing means for converting process data sent from a plant into graph data representing a temporal change,
In a process monitoring device having display means for displaying a plurality of graph data converted by the data processing means and input means for inputting desired information to the data processing means, the input means is provided as the desired information. While inputting the position of the reference line displayed on the display screen of the display means and the magnification for enlarging the graph of the graph data and the instruction to select the graph to be enlarged from the plurality of graphs displayed on the display means, The data processing means is
Reference line display means for displaying a reference line parallel to the horizontal axis on the display screen of the display means based on the instruction of the position of the reference line input from the input means, and display on the display screen of the display means. The reference line by amplifying the difference between the reference line and the graph of the process data selected by the instruction to select the graph input from the input means, and amplifying the difference based on the instruction of the magnification input from the input means. And enlarged graph display means for displaying the graph data amplified on the basis of.

In the above process monitoring apparatus, preferably, the enlarged graph display means subtracts the distance of the process data from the reference line, multiplies the magnification input from the input means by the difference of the distance, and further, Then, a value obtained by adding the value of the reference line to the difference multiplied by the magnification is obtained.

In the above process monitoring apparatus, preferably, the magnified graph display means creates scale value data according to a magnified value on the vertical axis of the amplified graph data, and the scaled value data is magnified together with the magnified graph. The scale is displayed on the display means.

In the above process monitor, preferably, the enlarged graph display means displays a graph of the process data after the enlargement, instead of the graph of the process data before the enlargement.

In the above process monitoring apparatus, preferably, the enlarged graph display means is capable of displaying a graph of the process data before the enlargement and a graph of the process data after the enlargement and selectively displaying either of them.

[0012]

According to the present invention, the reference line parallel to the horizontal axis is displayed on the display screen of the display unit by the reference line display unit based on the instruction input from the input unit, and the reference line is displayed by the enlarged graph display unit. By amplifying the difference between the line and the graph of the process data and displaying the amplified graph data with this reference line as a reference, a process monitoring device having a trend graph magnification changing function that is easy to use can be obtained.

Further, according to the present invention, a graph to be enlarged and displayed is selected from a plurality of graphs displayed on the screen of the display means based on the instruction input from the input means, and the graph is displayed on the display screen of the display means. The reference line display means displays a reference line parallel to the horizontal axis, and the enlarged graph display means amplifies the difference between this reference line and the graph of the selected process data, and the reference line is used as a reference for amplification. Display graph data.

Further, the deviation of the process data from the reference line is subtracted, the set magnification input from the input means is multiplied by the difference of the deviation, and the value of the reference line is added to the difference multiplied by the magnification. Thus, the graph data amplified with the reference line as a reference is displayed.

Further, scale value data corresponding to the enlarged value on the vertical axis of the amplified graph data is created, and the enlarged scale is displayed together with the enlarged graph.

Further, instead of the graph of the process data before the enlargement, the graph of the process data after the enlargement is displayed.

Further, a graph of the process data before the enlargement and a graph of the process data after the enlargement are displayed, and either one of them can be selectively displayed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4 and 5.

FIG. 1 is a block diagram of a process monitoring device according to an embodiment of the present invention.

The process monitoring device, as shown in FIG.
The CRT display device 10, the key input device 20, and the processing device 30 are mainly configured. The process monitoring device is arranged on the central processing chamber side, and is connected to the controller 50 via a serial transmission line 40 with the plant to be controlled located on the field side. The controller 50 receives signals representative of the condition of the plant from the plurality of detectors 60. As the detector 60 for detecting the state of the plant located on the field side, for example, a plurality of thermometers 61 for detecting temperature and differential pressure transmitters 62 for detecting pressure are connected. Upon receiving the signal indicating the state of the plant from the detector 60, the controller 50 sends the state signal to the process monitoring device, and the controller 50 controls the actuator 70 such as the valve based on the control command programmed therein. Supply a signal. A sequencer 80 is connected below the controller 50.
In addition to being controlled by the sequencer 80, the sequencer 80 itself receives a signal from the detector in a closed loop and supplies a control signal to the actuator.

When the trend graph screen 11 is displayed on the cathode ray tube display device 10, the process data collecting unit 31 in the processing device 30 samples the process data from the process data detector 60 at a constant cycle, and processes it as a time series value. The data is stored in the data buffer 32. Then, the trend graph data generation unit 33 processes the time series values in the process data buffer 32 and sends the processed time series values to the image output unit 34 as trend graph data. Image output unit 3
In 4, the necessary information such as the frame and scale for trend display is combined with the trend graph data to create a trend graph screen, which is output to the CRT display device 10 and displayed as a trend graph 12 on the trend graph screen 11. To do.

The plurality of trend graphs 12 displayed on the trend graph screen 11 are displayed in color, and the right side of the trend graph 12 shows what each of the graphs represents to show what each graph represents. The parameter display 13 such as P1 indicating the pressure and T1 indicating the temperature is colored and displayed in a color corresponding to each color.
Therefore, by correlating the colors of the graph and the parameters, the correlation between the graph and the parameters becomes clear.

When it is desired to change the display condition of the trend graph 12, that is, when one of the trend graphs is to be enlarged and displayed, the operator uses the key input device 20 to select the reference line mode (MODE). ) Key 23
Press. Pressing the button once selects the baseline mode, pressing it again releases the baseline mode.

When the reference line mode is selected by pressing the mode (MODE) key 23, subsequently, a graph whose display condition is to be changed is selected from a plurality of trend graphs. In this selection, by pressing either the up key 21 or the down key 22 of the cursor keys in the key input device 20, the cursor 14 displayed on the right side of the screen 11 is moved up and down, and the temperature corresponding to the cursor position is changed. This is done by selecting one of the parameter displays 13 such as pressure and pressure.

A reference line 15 parallel to the horizontal axis is displayed on the trend graph screen 11. The reference line 15 moves up and down on the screen 11 by pressing either the up key 24 or the down key 25 in the key input device 20. Therefore, if the reference line 15 is displayed at the bottom of the screen 11 when the mode key 23 is pressed, the reference line 15 is moved upward by pressing the up key 24.
That is, when the up key 24 is pressed, the information is converted into numerical data that changes incrementally through the key input determination unit 35 and the reference line value (B) / magnification (G) storage unit 36 reference line value (B). It is stored in the storage area. Similarly, when the down key 25 is pressed, the information is converted into decrementally numerical data, and the key input determination unit 35
Are stored in the reference line value (B) / magnification (G) storage unit 36 in the reference line value (B) storage area.

The reference line value (B) stored in the reference line value (B) storage area in the reference line value (B) / magnification (G) storage unit 36 is extracted by the extraction unit 37 and is output to the image output unit. The reference line 15 is displayed at a position corresponding to the reference line value (B). When the reference line 15 moves, the scale value at that position is displayed at the bottom of the screen, for example, "BL.
It is displayed as "0". This is the baseline value (Base
Line) is 50. Units,
The temperature is 50 degrees.

That is, the key input determination unit 35, the reference line value (B) / magnification (G) storage unit 36, the extraction unit 37 and the image output unit 34 constitute a reference line display means.

After that, a reference line is arranged so that the trend graph 12 whose display condition is desired to be changed and the reference line 15 are crossed, and then the up key 26 for changing the magnification in the key input device 20. When the up key 26 of the down keys 27 is pressed, the gain changes sequentially. The change is
For example, it changes stepwise from 1 time to 2 times and 3 times. That is, when the up key 26 is pressed, the information is displayed as numerical data that changes incrementally through the key input determination unit 35 in the magnification (G) storage area in the reference line value (B) / magnification (G) storage unit 36. Stored in. Similarly, when the down key 27 is pressed, the information is displayed as numerical data that changes in a decremental manner, and the key input determination unit 3
5 is stored in the magnification value (G) storage area of the reference line value (B) / magnification (G) storage unit 36. When the magnification changes, the magnification value is displayed at the bottom of the screen, for example, "G.2".
Is displayed. This indicates that the magnification is 2 times.

The signal processing performed in the processing unit 30 for the input reference line value (B) and magnification (G) will be described below. When the reference line value (B) and the magnification (G) are input, they are taken into the reference line value / magnification storage unit 36 through the key input determination unit 35 and held therein. The take-out section 37 is
The reference line value (B) and the magnification (G) data stored in the storage unit 36 are extracted and output to the trend graph data generation unit 33.

The trend graph data generator 33 includes a normal trend graph data area for generating a normal trend graph and an enlarged trend graph data area for generating an enlarged trend graph according to the present invention. It is configured.

In the case of a normal trend graph display,
In the normal trend graph data area, the time series values stored in the process data buffer 32 are processed to generate normal trend graph data and sent to the image output unit 34.

On the other hand, when the mode key 23 is pressed, the signal is sent from the key input determination section 35 to the data generation section 33, and the time series data in the buffer 32 is sent to the enlarged trend graph data area. After that, when the cursor 14 is moved by operating the keys 21 and 22 and the graph to be enlarged is selected, the time-series data of the selected graph is sent to the enlarged trend graph data area and the graphs not selected are expanded. The time series data of is normally sent to the trend graph data area.

Next, the processing for the time series data sent to the expanded trend graph data area will be described.
In the trend graph data generation unit 33, the reference line value (B) and the magnification (G) extracted by the reference line value / magnification extraction unit 37 are input, and the processing of the process data stored in the process data buffer 32 will be described later. Is performed in the enlarged trend graph data area and stored in the image output unit 34.

That is, the key input determination unit 35, the reference line value (B) / magnification (G) storage unit 36, the extraction unit 37, the trend data graph generation unit 33, and the image output unit 34
Enlarged graph display means is configured.

The image output unit 34, which is a part of the enlarged graph display means, stores the reference line value (B) retrieved from the storage unit 36 by the retrieval unit 37 in order to properly display the enlarged scale. Based on the data of the magnification (G), the scale of the vertical axis is expanded according to the magnification (G) with reference to the reference line value (B) to create the scale data, and the scale data is combined with the scale graph data. The trend graph screen 1 with the enlarged trend graph and the corresponding scale
Displayed on the left side of the trend graph displayed in 1. The horizontal axis indicates the elapsed time of the process in steps of 10 minutes, 30 minutes, 1 hour, or the like. The display of this vertical axis makes it possible to know the approximate value of the process data value from the scale of the trend graph after amplification.

FIG. 2 is a functional explanatory diagram illustrating a trend data generation process for displaying the collected values of the process data as an enlarged trend graph according to an embodiment of the present invention.

Details of the operation of the trend graph data generator 33 will be described. Trend graph data generator 3
3 is data X1 corresponding to times t1, t2, ..., TN stored in the process data buffer 32 in chronological order.
For each value of X2, ..., XN, calculation is performed using the reference line value (B) and the magnification (G) as parameters, and the resulting values also correspond to the times t1, t2 ,. The data X1 ', X2', ..., XN 'are output as trend data. By this generation process, the trend data enlarged based on the input reference line value (B) and magnification (G) is stored in the image output unit 34, and as described above, the trend graph is displayed on the trend graph screen 11. Displayed as 12.

FIG. 3 is a flow chart for amplifying and expanding a trend graph according to an embodiment of the present invention. When this flow starts in step 100, it is determined in next step 102 whether or not the reference line mode has been selected. When the mode key 23 is pressed once and the reference line mode is selected, step 104
In, select the trend graph to be expanded from the multiple trend graphs. In this selection, the cursor 14 is moved up and down on the trend graph screen 11, and desired parameters in the trend graph such as temperature and pressure are selected. Then, in step 106, it is determined whether the graph is the selected graph. With respect to the selected graph, processing for expanding the graph is performed in the expanded trend graph data area, and for other graphs, processing for normal graph display is performed in the normal trend graph data area.

The graph enlargement will be described below. In step 108, the time series data of the graph to be enlarged is read into the enlarged trend graph data area. Subsequently, in step 110, the reference line 15 is moved up and down by the up key 24 and the down key 25, and the numerical data accompanying the movement is passed through the key input determination unit 35 to the reference line value (B) / magnification (G) storage unit. It is stored in the reference line value (B) storage area of 36. The reference line value (B) stored in the reference line value (B) storage area in the reference line value (B) / magnification (G) storage unit 36 is extracted by the extraction unit 37, and the trend graph data generation unit 33. And the image output unit 34. In addition, the gain is sequentially changed by the up key 26 and the down key 27 for changing the magnification (gain), and the information is changed numerical value data through the key input determination unit 35 through the reference line value (B) and the magnification (G). ) It is stored in the magnification (G) storage area in the storage unit 36. Reference line value (B) / magnification (G) magnification (G) in storage unit 36
The magnification (G) stored in the storage area is extracted by the extraction unit 37 and input to the trend graph data generation unit 33 and the image output unit 34.

The steps shown in the next area surrounded by the broken line show a flow chart of a concrete operation process of conversion from the data Xi to the data Xi 'for generating the enlarged graph. In the figure, i is a subscript corresponding to the time series order of process data, and is an integer that takes a value from 1 to the maximum value N. First, the subscript i in step 112 is initialized. Subsequently, in step 114, (B + G × (Xi−B)) is calculated for the process data Xi corresponding to i. That is, the reference line value B is subtracted from the process data Xi and multiplied by the magnification G. This subtracts the deviation of the process data from the reference line value and multiplies the difference between the deviations by a set magnification to amplify the process data. By adding the reference line value B to the result, the reference line is calculated. The trend graph data Xi ′ amplified around the center can be obtained.
In step 116, the subscript i is updated to sequentially update the target process data. When the subscript i exceeds the maximum value N, the calculation is completed.

If the reference line mode was not selected in step 102, and if the graph was not selected as an enlarged graph in step 106, step 1
At 18, the time series data is read from the data buffer 32 into the trend graph data generation unit 33, and at the subsequent step 120, the trend graph data generation unit 33.
It is converted into trend graph data in the normal trend graph data generation area in. The converted graph is displayed on the trend graph screen 11 as a normal trend graph.

FIG. 4 shows a display example in which the trend graph is amplified and enlarged based on the reference line and the magnification of the signal amplification according to the embodiment of the present invention. The reference line for amplification display is displayed as a straight line parallel to the time axis (horizontal axis) at the height of B. In the trend graph of process data, the solid line is the original data and the dotted line is the data after amplification. That is, the trend graph data X1 at time t1 is the reference line B
Is displayed as newly expanded trend graph data X1 ′. Time t2, ... tN
The data corresponding to the data X2, ..., XN corresponding to are also enlarged and displayed as X2 ′ ,, XN ′, respectively.

Incidentally, in FIG. 4, the trend graph of the original process data and the trend graph of the enlarged process data are shown at the same time, but this is for convenience of description, and in practice, the reference line is used. When B is set and then the scaling factor B is selected, the amplification and enlargement calculation processing is instantaneously performed, and only the trend graph after the amplification and enlargement is displayed on the screen. That is, FIG. 5 is a display example showing that state. In FIG. 5, the left side shows the state before enlargement and the right side shows the state after enlargement. In the display example on the left side, the solid line indicates the temperature T1 and the alternate long and short dash line indicates the pressure P1.
Is shown. Since the trend graph of temperature T1 is selected as the trend graph to be expanded, the scale of the vertical axis is 0 degrees to 2 degrees in accordance with the trend graph.
00 degrees is full scale. The horizontal axis represents the passage of time, and the trend graph during the time from 22:00 to 23:00 is displayed. The reference line is set at 150 degrees, and when the magnification is selected to be 2 times, only the trend graph of the temperature T1 is centered around the temperature of 150 degrees on the reference line, as shown in the right figure. It is displayed in a vertically enlarged size of 2 times. The vertical scale is also expanded accordingly. The trend graph of the pressure P1 is displayed as usual.

As shown in FIG. 4, if a reference line for amplification display is set in the vicinity of the original process data trend graph, how much the magnification is set and how much the trend graph display changes will be displayed. Can be easily imagined, and it can be easily inferred whether or not it extends beyond the frame of the screen.

According to one embodiment of the present invention, a plant operator normally observes a trend graph showing a time-series change of process data on a cathode ray tube display device of a process monitoring device. When it is desired to enlarge and display the change, a reference line can be drawn at an arbitrary position to amplify and display the trend graph of the process data. Further, both the reference line value and the magnification can be designated as desired by the operator. Further, since it is possible to know the approximate value of the process data value from the scale of the trend graph after the amplification, the operator has the effect of improving the operability in process monitoring.

Further, in the process monitoring device, the trend graph of the process data displayed on the display device is
Amplification display can be performed at any magnification for easy observation by the operator, and the operator can check the amplitude of the trend graph amplitude on the screen one after another during a series of operations to perform amplification. The usability of the process monitor having the above is improved.

Another embodiment of the present invention will be described with reference to FIGS.

In this embodiment, both trend graphs before and after expansion are displayed.

The same reference numerals as those in FIG. 1 represent the same parts. 6 is different from FIG. 1 in that a confirmation key (CON) 28 and a cancel key (CAN) 29 are newly provided in the key input device 20, and signals of the respective keys 28 and 29 are the keys. It is added to the trend graph data generation unit 33 ′ from the input determination unit 35 and functions of the trend graph data generation unit 33 ′.

That is, the trend graph data generator 33 '
It includes a normal trend graph data area for generating a normal trend graph and an enlarged trend graph data area for generating an enlarged trend graph according to the present invention. In the case of displaying a normal trend graph, in the normal trend graph data area, the time series values stored in the process data buffer 32 are processed to generate normal trend graph data, which is sent to the image output unit 34. . On the other hand, the mode key 23
When is pressed, the signal is sent from the key input determination unit 35 to the data generation unit 33, is sent to the normal trend graph data area, and the time series data in the buffer 32 is sent to the enlarged trend graph data area. Become. After that, when the cursor 14 is moved by operating the keys 21 and 22 and the graph to be enlarged is selected, the time series data of the selected graph is sent to the enlarged trend graph data area. That is, all the time series data are sent to the normal trend graph data area, and the selected time series data are also sent to the expanded trend graph data area.

Next, the processing for the time series data sent to the expanded trend graph data area will be described.
In the trend graph data generation unit 33, the reference line value (B) and the magnification (G) extracted by the reference line value / magnification extraction unit 37 are input, and the processing of the process data stored in the process data buffer 32 is enlarged. It is performed in the trend graph data area and stored in the image output unit 34.

By outputting the data in both trend graph data areas to the trend graph screen 11,
Both trend graphs before and after expansion can be displayed. Further, when the enlarged trend graph is appropriate by the two input keys of "confirmation key" 28 and "cancel key" 29 provided in the key input device 20, if the "confirmation key" 28 is pressed, The output of the normal data corresponding to the graph to be expanded in the normal trend graph data area to the image output unit 34 is stopped, the trend graph before expansion is deleted from the screen, and only the expanded trend graph is displayed. . When the enlarged trend graph is not appropriate, pressing the "Cancel key" 29 stops the output of the enlarged data in the enlarged trend graph data area to the image output unit 34, and the enlarged trend graph is displayed. It is deleted and the trend graph display before enlargement remains. Therefore, by pressing the reference line mode key 23 again and performing the operation again, a more appropriate enlarged trend graph can be obtained.

FIG. 7 shows a display state on the trend graph screen 11 according to another embodiment of the present invention. That is, the temperature trend graph (solid line) T1 before expansion and the temperature trend graph (two-dot chain line) T1 ′ expanded at the same time.
Is displayed. In addition, a pressure trend graph (one-dot chain line) P1 which is a graph not to be enlarged is also displayed. The scale on the vertical axis corresponds to the graph in which the temperature is enlarged.

According to another embodiment of the present invention, the trend graph of the process data displayed on the display device can be amplified and displayed at an arbitrary magnification so that the operator can easily observe it. In a series of operation steps, the operator can successively confirm the change of the amplitude of the trend graph on the screen, and the process monitoring device having the trend graph magnification changing function is easy to use.

Further, since both the trend graphs before and after the enlargement can be displayed, a more appropriately enlarged trend graph can be obtained by comparing the both.

In the above description, the input is made using the mode selection key, the up key, and the down key provided on the key input device, but the same operation can be performed using a mouse. That is, the trend graph screen 11 of the display device 10
A display for selecting the reference line mode is provided in the upper margin, and the reference line mode is selected by pointing and clicking this "reference line mode" display with the mouse, and then on the trend graph screen 11. , Select the trend graph you want to expand by pointing the mouse to the trend graph you want to expand (for example, either P1 or T1 graph), and click to select the trend graph you want to expand. After indicating the "reference line" display with the mouse and clicking, display at any position on the trend graph, for example, 15
When the cursor is moved to the position of the vertical axis of 0 degrees and clicked, the reference line is displayed at the position of 150 degrees. Furthermore, an "up" and "down" display for selecting up or down is provided on the trend graph screen 11. By pointing this display with the mouse and clicking, either up or down is selected, and the mouse The magnification can be selected by holding down the key to change the magnification and releasing the key to stop the change. As described above,
It is also possible to use the mouse to input a reference line or magnification for enlarging the trend graph.

The same thing can be done by using a touch panel system instead of the mouse. That is, the cursor up key 21, the down key 22, the reference line mode key 23, and the reference line up key 2 of the key input device 20 in FIG.
4, by providing a panel portion having a function corresponding to the down key 25, the magnification up key 26, and the down key 27 in the margin on the trend graph screen 11 and directly touching and selecting the corresponding portion of the panel portion. Each key can be selected. That is, using this touch panel,
You can also enter the reference line and magnification for enlarging the trend graph.

[0058]

According to the present invention, the usability of a process monitoring device having a trend graph magnification changing function is improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a process monitoring device according to an embodiment of the present invention.

FIG. 2 is a functional explanatory diagram illustrating a trend graph data generation process according to an embodiment of the present invention.

FIG. 3 is a flowchart of an embodiment of the present invention.

FIG. 4 is an explanatory diagram for amplifying and displaying a trend graph on the basis of an operator-specified reference line value and a magnification according to an embodiment of the present invention.

FIG. 5 is a display example diagram in which a trend graph is amplified and enlarged based on a reference line value and a magnification designated by an operator according to an embodiment of the present invention.

FIG. 6 is a block diagram of a process monitoring device according to another embodiment of the present invention.

FIG. 7 is a display example view in which a trend graph is amplified and enlarged and displayed based on an operator-specified reference line value and a magnification according to another embodiment of the present invention.

[Explanation of symbols]

 10 ... CRT display device 11 ... Trend graph screen 12 ... Trend graph 15 ... Reference line 20 ... Key input device 30 ... Processing device 31 ... Process data collection unit 32 ... Process data buffer 33, 33 ' ...... Trend graph data generation unit 34 ...... Image output unit 35 ...... Key input determination unit 36 ...... Reference line value / magnification storage unit 37 ...... Reference line value / magnification extraction unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09G 5/00 510 C 9377-5H

Claims (6)

[Claims] 1. A data processing means for converting process data sent from a plant into graph data showing a temporal change, a display means for displaying the graph data converted by the data processing means, and the data processing means. In the process monitoring device having input means for inputting desired information, the input means enlarges the graph of the reference line position and the graph data displayed on the display screen of the display means as the desired information. The data processing means displays the reference line parallel to the horizontal axis on the display screen of the display means based on the instruction of the position of the reference line input from the input means. Means and the difference between the reference line displayed on the display screen of the display means and the graph of the process data is calculated based on the magnification ratio input from the input means. An enlarged graph display means for displaying the graph data amplified with the reference line as a reference by amplifying based on an instruction. 2. A data processing means for converting process data sent from a plant into graph data representing a temporal change, a display means for displaying a plurality of graph data converted by the data processing means, and the above data. In a process monitoring device having an input unit for inputting desired information to a processing unit, the input unit is a graph of the position of a reference line and the graph data displayed on the display screen of the display unit as the desired information. And an instruction to select a graph to be enlarged from the plurality of graphs displayed on the display means are input, and the data processing means is based on the instruction of the position of the reference line input from the input means. And a reference line display means for displaying a reference line parallel to the horizontal axis on the display screen of the display means, and a reference line displayed on the display screen of the display means. The reference by amplifying the difference between the selected reference line and the graph of the process data selected by the instruction to select the graph input from the input means, and amplifying the difference based on the instruction of the magnification input from the input means. A process monitoring device comprising: an enlarged graph display means for displaying amplified graph data based on a line. 3. The process monitoring apparatus according to claim 1, wherein the enlarged graph display means subtracts the distance of the process data from the reference line,
A process monitoring apparatus, characterized in that the difference input by the input means is multiplied by the difference, and a value obtained by adding the value of the reference line to the difference multiplied by the difference is obtained. 4. The process monitoring device according to claim 1, wherein the enlarged graph display means creates scale value data according to an enlarged value of a vertical axis of the amplified graph data, A process monitoring apparatus characterized in that an enlarged graph and the enlarged scale are displayed on the display means. 5. The process monitoring apparatus according to claim 1, wherein the enlarged graph display means displays a graph of the expanded process data instead of the graph of the unprocessed process data. Process monitoring device characterized by. 6. The process monitoring apparatus according to claim 1, wherein the enlarged graph display means displays a graph of the process data before the enlargement and a graph of the process data after the enlargement and displays either of them. A process monitoring device characterized by being selectively displayable.