JPH1185446A - Method for displaying trend graph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make accurately and properly executable the comparing analytical operation between plural trend graphs having mutually different data collecting periods by a comparatively easy operation. SOLUTION: Plural windows 48a, 48b are opened on a display screen 24 and trend graphs are displayed in respective windows 48a, 48b. In the case of selecting one or plural pen charts 60b to be synthetically displayed on one window 48b and moving the selected pen charts 60b to the other window 48a by mouse dragging operation, data processing for allowing display conditions such as time bases to automatically coincide with each other between both the windows 48a, 48b is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying a trend graph, and more particularly to a method for comparing and displaying graphs having different data collection periods.

[0002]

2. Description of the Related Art Conventionally, this type of display method generally performs a comparative analysis by opening a plurality of windows to be compared on a display screen of a display and arranging the windows vertically or horizontally. .

[0003]

However, in the above-described method of comparing the windows in units of windows, it is difficult to determine the positional relationship between the pen charts contained in the windows and the subtle differences in the waveform. In this case, the difference between the waveforms was erroneously recognized, which was inconvenient.

The present invention has been made in view of such inconvenience, and enables a composite display of graphs in units of individual pen charts, thereby facilitating comparative analysis of trend graphs having different data collection periods. It is an object of the present invention to provide a display method which can be performed accurately by using a display method.

[0005]

According to the present invention, as shown in FIG. 1, a data group which stores a physical value which changes with the passage of time and which is sampled at predetermined time intervals and converted into a digital value is stored. This is a method of displaying a series of trend graphs 26 on the display screen 24.

Further, a plurality of data groups having different measurement conditions are provided, and the time axis of the pen chart 60 formed from each data group can be corrected so as to coincide with the reference time axis, and the time axis can be corrected. Series of pen charts 60
Are individually operated so as to be superimposed and displayed on the same time axis.

The data groups having different measurement conditions are displayed on an independent window 48 as the trend graph 26 corresponding to the graph axis corresponding to each measurement condition, as shown in FIG. Figure 8
As shown in (b), an instruction input unit 19 such as a mouse on the display screen 24 in units of a series of pen charts 60.
It is preferable that the display conditions can be automatically corrected in accordance with the time axis of the transfer destination at the time of movement, in addition to enabling the movement by the instruction operation using.

In the above data group, it is assumed that data before and after a time point when a predetermined condition is satisfied are automatically collected in, for example, the process data storage means 21 and are superimposed and displayed on the same time axis. The displayed trend graph 26 may be displayed so that the above-mentioned time points are automatically matched. The plurality of pen charts 60 displayed in a superimposed manner are processed for each time coordinate under preset conditions, and the calculation results are superimposed on the same time axis and displayed as a graph 66 as shown in FIG. It is also possible.

As shown in FIG. 1, the data processing device is connected to a predetermined external device 10 via a communication path 12 and communicates with the state data storage means 17 via the communication path 12, for example. A data communication means 14 for enabling the exchange of data with the communication side, an event data storage means 16 for storing a plurality of processing instructions including reference information for specifying the operation content to be processed, and an event data storage means 16 The control means 18 decodes the processing instruction words provided for the processing instruction and performs a control operation corresponding to the information referred to by each processing instruction word.
And a display unit 20 that performs a predetermined display operation in conjunction with a signal input from the control unit 18.

[0010]

As described above, according to the present invention, by enabling the combined display of graphs in units of individual pen charts 60, comparative analysis of trend graphs 26 having different data collection periods can be accurately performed by an easy operation. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of displaying a trend graph according to the present invention will now be described with reference to FIG.
The operation of the display device 30 and the program type display device 22 used as a display panel will be described in detail based on an example. However, a general-purpose O / O device using a dedicated device or a general-purpose personal computer device specialized in collecting process data and displaying a trend graph based on the data is used.
The configuration of the device that implements the display method, such as that configured by an application program running on S, is not limited. Furthermore, the configuration itself of the program type display device 22 is also an example, and it is needless to say that the configuration can be appropriately changed and implemented.

The programmable display device 22 includes a PLC 30
Along with this, it is integrated into an operation console or the like of the target system 28, or is provided independently, and is used as an operation and display panel for the target system 28. A setting or control operation is performed.

PLC for controlling target system 28
The circuit 30 has a function achieved as a whole in the PLC 30 in which a circuit is unitized for each required function such as a CPU unit and a memory unit, and the units are connected in parallel so as to be able to increase or decrease as necessary. The configuration is substantially the same as that of the related art that can be changed.

The storage location of various information input / output to / from the target system 28 is controlled by passive components such as level gauges and limit switches provided on the target system 28 to be controlled or displayed, or relays and motors. A word device is specified for word data whose input / output data is numerical values, and a bit device is specified for bit data such as motor on / off information. In addition, by setting a device-specific device name such as “D100” in advance for each device, necessary data is stored in the memory unit so that the storage location can be specified by designating the device name. .

Therefore, by simply accessing the arbitrary word device or bit device in the memory unit by designating the device name from inside or outside of the PLC 30, without knowing the actual address in the PLC 30,
The corresponding position of the target system 28 is controlled or various process data relating to the operation state can be individually taken out.

The programmable display device 22 has substantially the same configuration as the personal computer device, and has a display control circuit 32 shown in FIG.
As shown in FIG. 3, the front surface of the display screen 24 on the display 34 is covered with a transparent touch panel 36 in close contact with the touch panel 36.
The coordinates are analyzed by being taken in through the system 8, and various manual operations can be performed by a fingertip at the time of a test, at the time of initial setting before the operation of the entire system is started, or during the operation.

Here, in the programmable display device 22, there is no need to change the display contents such as the nameplate.
0 and a functional component graphic 42 such as a switch graphic for changing the shape, blinking or changing the color on the base screen 40
Is designated and stored for each required display unit.

On the other hand, the processing instruction word W illustrated in FIG. 4A stored in advance in the event data memory 58 is read out intermittently every minute time, and the event name N of each processing instruction word W is read.
Are sequentially executed by referring to the data taken out from the PLC 30 through the communication controller 44 into the state data memory 46, thereby changing the contents of the bit device or the word device of the PLC 30. In response, the display operation in which the shape of the functional component graphic 42 changes is performed.

That is, the basic structure of the processing instruction word W is as follows.
It consists of a file number F of the base screen 40 on which the display control operation is to be executed, an event name N specifying the operation content to be executed on the base screen 40, and one or a plurality of data referred to for each execution event. Reference information r is provided as one set.

For example, the processing instruction word WG shown in FIG.
Opens a window 48 on the base screen 40 as shown in FIG. 3 and allows the trend graph 26 to be displayed in the window 48. The file number F1 of the base screen 40 and the display of the trend graph 26 are specified. For example, G
, The display coordinate range D1 of the graph, the device name D2 for specifying the storage location of the data to be displayed in the graph, and whether the device is a bit device consisting of on / off information or a word device such as a temperature change. , A graph information D4 for specifying the line type and color of the displayed graph, and a time interval D5 for sampling data as reference information r.

Here, as shown in FIG. 5, for example, during the process control of the plant provided as the target system 28, the PLC 30 monitors the on / off timing of the level gauge 52, the liquid temperature gauge 54 and the pump 56 in the tank 50. If it is carried out in the trend graph 2
6, one processing instruction word WG is set for each of the three contents whose process data is to be monitored, as shown in FIG.

That is, for the three devices on which the trend graph 26 is to be displayed, the processing instruction words WG1 to WG3 whose display coordinate ranges D1 are matched are stored in the event data memory 5.
8 is stored. On the other hand, the tank level is word data at address A in the state data memory 46, the liquid temperature is word data at address B, and the on / off state of the pump 56 is a bit device at address C. Update processing is performed with a slight time delay due to data transfer.

Therefore, from each processing instruction word WG1 to WG3,
By specifying the corresponding devices A to C by using the device names of the display data, the data values are read from the state data memory 46 at a predetermined sampling time interval D5, and the window set on the display screen 24 is set. Within 48, it is displayed as a trend graph 26 composed of a plurality of pen charts 60.

The present invention has the above-mentioned structure, and further enables automatically collecting data generated within a predetermined period before and after the occurrence of the condition by using a preset condition as a trigger. It is characterized in that it is possible to compare and display the obtained data.

The processing instruction word WS for data collection is one unit or a plurality of types displayed in the window 48 in units of one window 48 set with the processing instruction word WG on the base screen 40 as described above. 4C, it is possible to collect the process data at the same time. As shown in FIG. 4C, in addition to the file number F1 of the base screen 40, the event name N2 starting with, for example, "S" for specifying the process data collection. Further, a data acquisition coordinate range D6 to be collected, a data collection start condition D7, and a data collection time range D8 are provided as reference information r.

Here, the data collection start condition D7 is as shown in FIG.
As shown in FIG. 6, instead of saving all the data on the trend graph 26 continuously displayed on the window 48, it is confirmed that a preset condition D7 is satisfied as shown in FIG. After that, ts
By selectively storing data generated in the first half period and the second half period, only data having a value to be stored can be collected.

That is, when the processing instruction word WS is set, the data storage area 64 having a size capable of temporarily storing at least the data of the first half period is stored in the RAM as shown in FIG.
It is set on a high-speed memory such as 66. In particular,
The data storage area 64 has substantially the same function as the shift register. As shown in FIG. 7A, a storage capacity corresponding to the data collection time range D8 is secured, and the system is driven during the operation. While the current data is sequentially written into the data storage area 64, the old data is overwritten and erased by new data that is successively taken in, so that data for a preset data collection time range is constantly stored in the data storage area 64. I try to keep it.

Even after the trigger condition is satisfied in such a state, when the writing of the current data is completed while the data is further shifted by the second half period of the collection time range, FIG.
As shown in (b), all data in the data storage area 64 is specified and copied into a data storage memory such as the hard disk 62, thereby completing one-time data collection.

The data collection start condition D7 can be arbitrarily set as long as the time can be uniquely specified, such as when the value of a predetermined word device exceeds a set value or when a bit device is turned on or off. Can be set. Also, the number of times of collection can be arbitrarily set.

In this embodiment, the data collection start condition D7 is made to match the display condition of the error message on the programmable display device 22, so that the data is automatically collected before and after the occurrence of the error. It is composed.

Further, the data automatically collected before and after the occurrence of the error as described above can be compared and displayed with the reference data and data of similar contents collected in the past while the program type display device 22 is offline. Is visually recognized on the trend graph 26.

That is, after the program type display device 22 is set to the off-line state and the comparison display mode of the trend graph 26 is selected, when data to be displayed is selected, FIG.
As shown in (a), for example, one reference window 48a is opened at the upper part of the display screen 24, and the trend graph 26 including one or a plurality of pen charts 60 collected by the automatic collection described above is displayed.

In the window 48a, the process data collected as described above is displayed as the trend graph 26 which does not change with time. Further, the amplitude value or the vertical direction is displayed for each pen chart 60. The position can be changed and the time axis can be shifted in the front-back direction or the time axis can be expanded / contracted, so that a plurality of pen charts 60 in one window 48 can be clearly distinguished and displayed. ing.

Next, when another data group to be compared and displayed with the graph displayed in the reference window 48a is selected and the display is selected, for example, the reference window 48a is displayed.
A window 48b for comparison is opened below, and the data group is displayed as the trend graph 26 in the same manner as in the reference window 48a.

In the trend graph 26 displayed in the two windows 48a and 48b, it is highly likely that not only the data collection time but also the data collection conditions such as the data sampling interval are different from each other. Therefore, when one or a plurality of pen charts 60b to be combined are selected in the comparison window 48b and then a graph combination is instructed, the display conditions of both are automatically matched, and the corresponding pen charts in the comparison window 48b are matched. FIG.
The image is copied to the reference window 48a as shown in FIG.

When the pen chart 60b copied in the window 48a is adjusted in the amplitude value or the time axis direction in the copy source window 48b, the change is reflected in the copy destination window 48a. The superimposed display is performed based on the same display criteria as the pen chart 60a previously displayed in the reference window 48a, and the two are compared.

Instead of automatically adjusting the display conditions of each of the windows 48a and 48b, it is also possible to make a copy after manually changing the display conditions. In addition, instead of performing graph synthesis by menu selection or switch operation, a pen chart 60 to be synthesized on the display screen 24 is individually specified using a pointing device such as a mouse or an instruction operation on the touch panel 36. By selecting and performing a drag and drop operation, the graph may be copied and combined.

Window 4 that can be opened at the same time
The number of 8s can be increased or decreased as appropriate. Further, instead of performing copy synthesis from one window 48a to another window 48b in units of one pen chart 60, a new window dedicated to graph synthesis is added. A plurality of pen charts 60 to be combined and displayed from the plurality of windows 48a and 48b may be specified and copied for that window.

Furthermore, when a plurality of sets of data groups are created and graph-combined under the above-mentioned fixed data-collection start conditions, the time points of occurrence of the data-collection start conditions are automatically matched during the composition. If graphs with different collection times can be displayed, accurate comparison operations can be performed.

Also, as shown in FIG. 9, arithmetic processing such as calculating a difference between the graphs after the synthesis is performed, and the result can be superimposed and displayed as a similar graph 66, so that the difference between the synthesized graphs is very small. In such a case, the difference between the two can be clearly identified. Needless to say, the content of the arithmetic processing can be appropriately changed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example in which the present invention is applied to a program type display device.

FIG. 2 is a block diagram illustrating an example of an electric circuit in the programmable display device.

FIG. 3 is an explanatory diagram showing a process of displaying a trend graph on a display screen.

FIG. 4 is an explanatory diagram showing a configuration of a processing instruction word,
(A) shows a basic configuration of a processing instruction word, (b) shows a configuration of a processing instruction word for displaying a trend graph, and (c) shows a configuration of a processing instruction word for collecting process data.

FIG. 5 is an explanatory diagram showing a data collection state in a target system.

FIG. 6 is an explanatory diagram showing a collection range of process data.

FIG. 7 is an explanatory diagram showing a process of collecting process data.

FIG. 8 is an explanatory diagram showing a process of synthesizing collected data.

FIG. 9 is an explanatory diagram showing a step of performing an arithmetic process after the graphs are combined.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 external device 12 communication path 14 data communication means 16 event data storage means 18 control means 20 display means 22 programmable display device 24 display screen 26 trend graph 28 target system 30 PLC 32 display control circuit 34 display 36 touch panel 38 touch panel controller 40 base Screen 42 Functional part graphic 44 Communication controller 46 Status data memory 48 Window 50 Tank 52 Level gauge 54 Liquid temperature gauge 56 Pump 58 Event data memory 60 Pen chart 62 Hard disk 64 Data storage area

Claims (5)

[Claims] 1. A data group that stores physical values that change over time and that is sampled at predetermined time intervals and converted into digital values is stored on a display screen (24) of a predetermined data processing device. A method of displaying a series of trend graphs (26), wherein a plurality of sets of data with different measurement conditions are provided, and a time axis of a pen chart (60) formed from each data group coincides with a reference time axis. A series of pen charts (60) whose time axes have been corrected are individually manipulated and superimposed and displayed on the same time axis. . 2. The data group having different measurement conditions described above is:
A trend graph (26) corresponding to a graph axis corresponding to each measurement condition is displayed on an independent window (48), and a series of pen charts (60) is provided between the windows (48).
2. The display method according to claim 1, wherein the display condition is automatically corrected in accordance with a time axis of a transfer destination at the time of movement, while being movable by an instruction operation on a display screen (24). 3. The data group described above is one in which data before and after a point in time at which a predetermined condition is satisfied are automatically collected, and a trend graph (superimposed and displayed on the same time axis) is displayed. 2
3. The display method according to claim 2, wherein in the step (6), the time point is displayed automatically. 4. The plurality of pen charts (60) displayed in a superimposed manner are subjected to arithmetic processing for each time coordinate under preset conditions, and the arithmetic results are superimposed on the same time axis and displayed as a graph. The display method according to claim 2 or 3, wherein: 5. The data processing device is connected to a predetermined external device (10) via a communication path (12), and can exchange data with the external device (10) via the communication path (12). Data communication means (14)
And an event data storage means (16) capable of storing a plurality of processing instructions including reference information for specifying an operation content to be processed.
A control unit (18) for decoding a processing instruction word provided in the event data storage unit (16) and performing a control operation corresponding to information referred to by each processing instruction word; A display device (22) having a display means (20) for performing a predetermined display operation in conjunction with a signal input of the external device (10). The display method according to claim 1, wherein display is enabled.