WO2022190549A1

WO2022190549A1 - Data analysis support device and data analysis support method

Info

Publication number: WO2022190549A1
Application number: PCT/JP2021/047131
Authority: WO
Inventors: 慎太郎岩本; 実橋本; 一洋工藤
Original assignee: オムロン株式会社
Priority date: 2021-03-08
Filing date: 2021-12-20
Publication date: 2022-09-15
Also published as: JP2022136606A

Abstract

This data analysis support device comprises: a data acquisition means that reads a plurality of data sequences recorded in a subject system; a graph display means that generates, for two or more data sequences having common axes among the plurality of data sequences, a graph screen on which the graphs of the respective data sequences are drawn with the common axes being aligned, and displays the graph screen in a display device; and an operation means that provides a user interface for receiving a movement operation of moving the graph of at least one data sequence out of the two or more data sequences, the graphs of which are displayed on the graph screen, along the aligned common axes.

Description

Data analysis support device, data analysis support method

The present invention relates to technology for supporting data analysis.

In the FA (factory automation) field, when an event occurs in equipment operating in a factory, it is possible to analyze log data such as the output of the equipment and the measurement values of various sensors to investigate the cause of the event. be. In such data analysis, it is effective to investigate and confirm correlations and causal relationships between data series while looking at graphs plotting various collected data series on a common evaluation axis (for example, time axis). .

In Patent Document 1, in order to monitor quality fluctuations in an injection molding machine, at least the production achievement rate, the presence or absence of an abnormality, the presence or absence of changes in molding conditions, and a quality data trend graph are displayed on a display in a multiplex manner on a common time axis. A method for displaying by screen is described. As a specific example, the production achievement rate and the presence or absence of an abnormality are displayed on one common screen in the multi-screen along a common time axis, and the production achievement rate is displayed in a line graph to indicate whether or not an abnormality has occurred. When there is an abnormality, the time width is displayed in a strip shape and perpendicular to the common time axis.

JP-A-2001-293761

In the above data analysis, data is collected from various devices such as manufacturing equipment, PLCs, controllers, and sensors. However, since the timing of measurement and recording, the sampling period, the accuracy of the built-in clock, etc., differ from device to device, even if the data series collected from different devices are superimposed on the same evaluation axis, they may not match each other. There is In addition, some devices can record only the elapsed time (operating time) from activation, and the data series obtained by such devices cannot be adjusted based on absolute time.

If the data series plotted on the evaluation axis were misaligned, it would be difficult to understand the correlation and causal relationship between the data series, and there was a problem that estimating the cause required experience and time.

The present invention has been made in view of the above circumstances, and aims to provide a technique for supporting understanding of correlations and causal relationships between multiple data series.

In order to achieve the above objects, the present invention adopts the following configuration.

A first aspect of the present invention includes data acquisition means for reading a plurality of data series recorded in a target system, and graphs of each data series for two or more data series having a common axis among the plurality of data series. and graph display means for generating a graph screen drawn with the common axes aligned and displaying the graph screen on a display device; and at least one of the two or more data series displayed on the graph screen and operation means for providing a user interface that accepts a movement operation for moving a graph of one data series along the common axis, wherein the graph display means displays the graph in accordance with the operation accepted by the user interface. A data analysis support device characterized by updating a screen is provided.

By providing such a user interface and graph display update function, users can easily adjust the data series on the screen so that they have a meaningful positional relationship while comparing the graphs of each data series. can do. Therefore, it is expected that correlations and causal relationships between data series, which cannot be understood simply by superimposing the original data series, can be easily discovered, and efficient analysis becomes possible.

The user interface may accept a movement target selection operation for selecting a data series to be moved from among the two or more data series displayed as a graph on the graph screen. The efficiency and convenience of analysis are improved by allowing the user to arbitrarily select and switch moving targets.

The user interface includes a partial selection operation for selecting only a portion of the data series graph selected as a movement target, and a partial movement operation for moving only the portion selected by the partial selection operation along the common axis. may be accepted. The efficiency and convenience of analysis are improved by being able to adjust the position by focusing on a portion of the graph (for example, change point, rising edge, falling edge, cross point, etc.).

The user interface may receive a display target selection operation for selecting a data series to be displayed as a graph from among the plurality of data series read by the data acquisition means. The efficiency and convenience of analysis are improved by allowing the user to arbitrarily select and switch the data series to be compared and displayed.

The display target selection operation may be an operation to select the item name of the data series to be displayed as a graph on a list displaying the item names of the plurality of data series. With such a user interface, it is possible to intuitively select a graph display target.

The display target selection operation is an operation of dragging and dropping the item name of the data series to be displayed as a graph from the list displaying the item names of the plurality of data series into the graph drawing area on the graph screen. good too. With such a user interface, it is possible to intuitively select a graph display target.

The user interface is configured so that, when a data series to be displayed as a graph is selected from among the plurality of data series, a data series that does not have a common axis with the selected data series cannot be selected as a graph to be displayed. can be controlled to By performing such selection control, it is possible to prevent selection of a data series that cannot be plotted on the same common axis, thereby improving user convenience.

The graph screen may include a plurality of graph drawing areas, and the user interface may accept a drawing area designation operation for designating in which graph drawing area the data series selected as a graph display target is to be displayed. When comparing a plurality of data series, it is possible to arbitrarily select display such as overlaying them in the same graph drawing area or arranging them in separate graph drawing areas, thereby improving the efficiency and convenience of analysis.

The graph display means may draw the graph before movement and the graph after movement on the graph screen in an identifiable manner. By making it possible to easily identify the graph before movement, that is, the original state, there is no confusion as to whether the displayed graph is the original state or the one that has been modified by the user.

The operation means may limit the movement of the graph within a predetermined range. For example, the predetermined range may be set equal to or less than the sampling period of the data series to be moved. By setting such restrictions, the convenience at the time of correction is improved. Moreover, since it is possible to prevent absurd editing in advance, even a person with little experience or skill can easily edit a graph with validity and perform appropriate analysis.

After moving the graph, the user interface may accept a movement completion operation for determining the drawing position of the graph. As a result, unintended graph editing can be prevented, thereby improving convenience.

It may further include operation history recording means for recording the contents of operations performed by the user using the user interface as an operation history. As a result, the state of the graph edited by the user can be easily reproduced later, output to the outside, or communicated to others.

The graph display means may draw movement amount information on the graph screen as additional information of the graph after movement. By making it possible to quantitatively grasp the amount of movement, the efficiency and convenience of analysis are improved.

The user interface may accept a reset operation to restore the graph after movement to its original state. This improves convenience.

According to a second aspect of the present invention, a step of reading a plurality of data series recorded in a target system; generating a graph screen drawn with a common axis aligned and displaying the graph screen on a display device; A data analysis comprising: receiving a moving operation for moving a graph of one data series along the common axis; and updating the graph screen according to the operation received by the user interface. Offer a way to help.

A third aspect of the present invention provides a program for causing a computer to execute each step of the above data analysis support method.

The present invention may be regarded as a data analysis support device, a cause analysis device, a data series display device, etc., having at least part of the above means. In addition, the present invention may be regarded as a data analysis support method, a cause analysis method, a data series display method, etc. having at least part of the above processing, and a program for realizing such a method and its program It can also be regarded as a recording medium recorded on the . It should be noted that each of the means and processes described above can be combined with each other as much as possible to constitute the present invention.

According to the present invention, it is possible to support understanding of correlations and causal relationships between multiple data series.

FIG. 1 is a diagram schematically showing an application example of a data analysis support device according to one embodiment of the present invention. FIG. 2 is a diagram showing an example of a graph screen of the data analysis support device. FIG. 3 is a block diagram showing a configuration example of the data analysis support device according to this embodiment. FIG. 4 is a flow chart showing the flow of processing by the data analysis support device. FIG. 5 is a diagram showing an example of a graph screen of the data analysis support device. FIG. 6 is a diagram for explaining a usage example of the partial selection operation and the partial movement operation. FIG. 7 is a diagram illustrating an example of a target system in Analysis Example 1; FIG. 8 is a diagram showing how data is analyzed in Analysis Example 1. As shown in FIG. FIG. 9 is a diagram showing how data is analyzed in Analysis Example 1. As shown in FIG. FIG. 10A is a diagram showing an example of a target system in Analysis Example 2, and FIG. 10B is a diagram explaining the cause of ambient light. FIG. 11 is a diagram showing how data is analyzed in Analysis Example 1. As shown in FIG. FIG. 12 is a diagram showing an example of a graph screen of the data analysis support device.

<Application example>
An application example of the present invention will be described with reference to FIGS. FIG. 1 schematically shows an application example of a data analysis support device according to one embodiment of the present invention. FIG. 2 shows an example of the user interface of the data analysis support device.

The data analysis support device 1 is an information processing device that provides a function of supporting the analysis of multiple data series recorded in the target system 2, which is the target of analysis. The data analysis support device 1 is used for estimating the cause and planning remedial measures when some event (for example, emergency stop, quality defect, etc.) occurs in the target system 2 .

The target system 2 is a device or device group to be analyzed by the data analysis support device 1, and can be set arbitrarily. In the example of FIG. 1, a PLC (programmable logic controller) 20, an SLC (safety light curtain) 21 having a light emitter 21T and a light receiver 21R, a power supply device 21P and a controller 21C for the SLC 21, and an SLC 22 having a light emitter 22T and a light receiver 22R , the power supply device 22P and the controller 22C of the SLC 22, the vibration sensor 23, and the like are set as the target system 2. FIG. The target system 2 and the data analysis support device 1 may be connected via a network, or the data analysis support device 1 may be offline while the devices of the target system 2 are in operation.

When the data analysis support device 1 reads a plurality of data series recorded in the target system 2, it generates and displays a graph screen 3 in which graphs of each data series are drawn with a common axis (for example, time axis) aligned ( See Figure 2). Using the user interface shown in Fig. 2, the user can arbitrarily select the data series to be displayed, and arbitrarily move the displayed graph along the common axis to adjust the positional relationship between the data series. When adjusted, the drawing on the graph screen 3 is updated according to the operation.

<Embodiment>
FIG. 3 is a block diagram showing a configuration example of the data analysis support device 1 according to this embodiment.

The data analysis support device 1 has a data acquisition unit 11, a storage unit 12, a graph display unit 13, an operation unit 14, and an operation history recording unit 15 as main components.

The data acquisition unit 11 is a function that reads multiple data series recorded in the target system 2 . A data series is a data set composed of a plurality of values, and may be any type of data as long as it is digital data generated, measured, and recorded by equipment that configures the target system 2 . In the case of the target system 2 of FIG. 1, for example, the time-series data of the amount of light received by the

SLCs

21 and 22, the safety signal (stop command signal) of the

SLCs

21 and 22, and the individual amount of light received for each optical axis of the

light receivers

21R and 22R ,

power supply

21P, 22P alert signals,

controller

21C, 22C drive signals,

controller

21C, 22C muting information, vibration sensor 23 detection signals, PLC 20 control signals and I/O, etc. can be used.

The storage unit 12 has a function of storing acquired data series, user operation history, graphs after editing, and the like.

The graph display unit 13 is a function that generates a graph screen (see FIG. 2) in which the graphs of each data series are drawn with the common axis aligned, and displays the graph screen on the display device 16. "Draw with common axes" includes a mode in which multiple data series graphs are drawn in the same graph drawing area (graph area) (see Figure 2), and multiple data series graphs are drawn separately. Both of the forms of drawing side by side in the area (see FIG. 4) are included.

The operation unit 14 is a function that provides a user interface that accepts operations on graphs. ``Graph operations'' include, for example, a ``move operation'' to move the graph along the common axis, a ``move target selection operation'' to select the data series to be moved, and a ``partial operation'' to select only a part of the graph. "Select operation", "Partial movement operation" to move only a part of the graph along the common axis, "Display target selection operation" to select the data series to be displayed in the graph, In which graph drawing area to display the selected data series It may include a "drawing area designation operation" for specifying whether to move the graph, a "movement completion operation" for determining the drawing position of the graph, and a "reset operation" for returning the graph after movement to its original state.

The operation history recording unit 15 is a function that records the contents of operations performed by the user using the user interface as an operation history.

The display device 16 is a device for displaying information, and uses, for example, a liquid crystal display or an organic EL display. The input device 17 is a device for inputting information, and uses, for example, a keyboard, a mouse, a touch panel, and the like. A touch panel display that serves as both the display device 16 and the input device 17 may be used.

The data analysis support device 1 may be composed of, for example, a personal computer equipped with a processor, memory, storage, and the like. In that case, the processor loads the program stored in the storage into the memory and executes the program to provide the functions of the units shown in FIG. Note that the configuration is not limited to this configuration, and some or all of the functions in FIG. 3 may be configured by ASIC, FPGA, or the like, or may be realized by cloud computing or distributed computing.

<Data analysis support method>
An example of the data analysis support method of this embodiment will be described along FIG. FIG. 4 is a flow chart showing the flow of processing by the data analysis support device 1. As shown in FIG.

For example, the user activates the data analysis support device 1, designates the target system 2 to be analyzed, and instructs data acquisition. Then, in step S<b>100 , the data acquisition unit 11 reads log data from devices included in the target system 2 . In the example of FIG. 1, for example, the time-series data of the amount of light received by the

SLCs

21 and 22, the safety signal (stop command signal) of the

SLCs

21 and 22, the individual amount of light received for each optical axis of the

light receivers

21R and 22R, and the

power supply

21P , 22P, drive signals of the

controllers

21C and 22C, muting information of the

controllers

21C and 22C, detection signals of the vibration sensor 23, control signals of the PLC 20, I/O, and the like may be read. The data series acquired in step S100 is stored in the storage unit 12. FIG.

In step S101, the graph display unit 13 generates a graph screen and displays it on the display device 16.

An example of the graph screen 3 is shown in FIG. The graph screen 3 includes a graph area 30 as a graph drawing area, a data series list 31 as a user interface for receiving a display target selection operation and a movement target selection operation, and a user interface for receiving a movement operation and a partial movement operation. It includes a move button 32 and a reset button 33 for accepting a reset operation. In the data series list 31, the item names of the data series read in step S100 are listed, and a display check box and a move check box are arranged next to each item name. In the initial state, all check boxes are OFF (non-selected), and nothing is drawn in the graph area 30 .

When the user performs a predetermined operation on the user interface of the graph screen 3 using the input device 17 such as a mouse or touch panel, the operation unit 14 accepts the user operation in step S102. If the user's operation is received, the process proceeds to step S103. Although not shown, if the user's operation is an end operation, the process exits from the flow in FIG. 4 and ends.

In step S103, the graph display unit 13 updates the graph screen 3 according to the user's operation received in step S102. Then, in step S104, the operation history recording unit 15 records the content of the user's operation (that is, how the user edited the graph) in the storage unit 12 as an operation history. The processing of steps S103 and S104 is executed each time a user operation is performed.

<Graph operation>
An example of graph manipulation on the graph screen will be described in detail.

(1) Display target selection operation When the user turns ON the display check box of the data series list 31 on the graph screen 3 of FIG. It is drawn in the graph area 30 . Here, when two or more data series are selected, the graph display unit 13 draws the graphs of each data series with the common axis aligned. In the example of FIG. 2, item A "SLC received light amount" and item B "SLC safety signal" are selected, and the graph of item A (broken line) and the graph of item B (solid line) are aligned with the time axis. is drawn.

By the way, since the data series acquired in step S100 can include various types of data sets, there may be combinations of data series that do not have a common axis. If such a combination of data series is selected, the graph cannot be plotted on the same common axis. Therefore, the operation unit 14 prohibits selection of already selected data series and data series that do not have a common axis as graph display objects so that data series that do not have a common axis are not selected at the same time. control. In the example of FIG. 2, the data series of items A to D have a common axis of time, but the data series of items E and F do not have a time axis. Therefore, when item A and item B are selected, the display check boxes of item E and item F are disabled (also referred to as grayed out state) and cannot be selected.

The selection of the display target may be performed by an operation other than selecting the item name in the data series list 31 (turning on the display check box). For example, an operation of selecting an item name on the data series list 31 and dragging and dropping it onto the graph area 30 may be performed.

By providing a user interface such as the one described above, the user can intuitively select the graph display target, which can improve the efficiency of data analysis and user convenience.

(2) Movement Target Selection Operation When the user turns on the movement check box of the data series list 31 on the graph screen 3 of FIG. 2, the data series is selected as a movement target. One or more moving objects can be selected. In the example of FIG. 2, item B "SLC safety signal" is selected as a movement target.

(3) Movement Operation When the user operates the movement button 32 on the graph screen 3 of FIG. 2, the graph of the data series selected as the object to be moved moves along the common axis. For example, as in the example of FIG. 2, when the left arrow button of the move button 32 is pressed with the move check box for item B "SLC safety signal" turned ON, the graph drawn in the graph area 30 B moves left by a predetermined amount. If you want to move Graph B further to the left, press or hold the left arrow button repeatedly. Conversely, if the graph B is to be moved to the right, the right arrow button of the movement buttons 32 should be pressed.

For example, in Figure 2, we are trying to analyze the relationship between the amount of light received by the SLC and the safety signal. It is assumed that the SLC is designed such that when the amount of light received falls below the threshold value Th, it determines that light is blocked by an object and outputs a safety signal ON. Looking at the upper part of FIG. 2 (the graph before movement), it seems that the decrease in the amount of received light is related to the ON output of the safety signal. The timing (cross point) at which Th is crossed is deviated. Such discrepancies occur because the timing of measurement and recording, the sampling period, the accuracy of the built-in clock, etc. differ between the device that records the log of the amount of received light and the device that records the log of the safety signal. be. With the skewed graph, I'm not sure if there's really a correlation between the amount of light received and the safety signal. Therefore, when the user gradually moves graph B to the left while looking at the graph area 30, the timing of the rise and fall of the safety signal just coincides with the cross point of the amount of received light. By looking at such a graph display, it becomes possible to intuitively and clearly understand that the ON output of the safety signal is caused by a decrease in the amount of received light, which can be expected to improve the efficiency and accuracy of data analysis. .

When a move operation is performed, it is preferable to draw the graph before the move and the graph after the move on the graph screen 3 in an identifiable manner. In the example of FIG. 2, the graph before movement (that is, the original graph) is drawn with a dotted line, and the graph after movement is drawn with a solid line, so that both can be distinguished. Alternatively, for example, color, thickness, line type, density, transparency, etc. may be changed. Further, when a movement operation is performed, it is preferable to draw movement amount information (that is, how much the graph is moved) on the graph screen 3 as additional information of the graph after movement. In the example of FIG. 2, the moving direction and the moving amount are drawn near the graph B, such as ".rarw.30 ms." By making it possible to easily identify the graph before movement, that is, the original state, there is no confusion as to whether the displayed graph is the original state or the one that has been modified by the user. In addition, by making it possible to quantitatively grasp the amount of movement, efficiency and convenience of analysis are improved.

(4) Movement Completion Operation When the user turns off the movement check box in the data series list 31 after moving the graph, the drawing position of the graph is fixed. During data analysis, unintentional editing of the graph can be prevented by removing the check box after moving the graph to an appropriate position and confirming the position.

(5) Reset Operation When the user presses the reset button 33, all graphs after movement return to their original states. In the course of data analysis, I made hypotheses and tried to move the graph, but there were cases where I could not find a significant relationship. In such a case, if everything can be restored by a reset operation, trial and error can be easily performed and convenience will be improved.

(6) Drawing Area Designation Operation FIG. 5 shows another configuration example of the graph screen 3 . This graph screen 3 includes graph area 1 301 and graph area 2 302 as a plurality of graph drawing areas. In addition, the data series list 31 is provided with a display 1 check box and a display 2 check box.

When the user turns on the Display 1 check box, the graph of the data series of the item is displayed in graph area 1 301. On the other hand, if the display 2 check box is turned ON, the data series graph of the item is displayed in graph area 2 302 . It is also possible to display one data series graph in multiple graph areas by turning on both check boxes.

In the example of FIG. 5, item A "SLC received light amount" and item B "SLC safety signal" are displayed in graph area 1 301, and item C "vibration sensor alert" and item D "power unit alert" are displayed in graph area 2 302. is displayed in Item B and item D are selected as moving targets. When the move button 32 is pressed in this state, the graph of item B in graph area 1 and the graph of item D in graph area 2 move together.

With this kind of user interface, when comparing multiple data series, you can arbitrarily choose to display them in the same graph drawing area or arrange them in separate graph drawing areas. improves.

(7) Partial Selection Operation and Partial Movement Operation A user interface may be prepared for selecting and moving only a portion of the graph instead of the entire graph. If such an operation becomes possible, editing such as moving only one to several sampling points on a graph or moving only one peak of a rectangular signal becomes possible.

An example of using partial selection/move will be explained using FIG. The upper part of FIG. 6 shows the original signal (analog signal), and the middle part shows the sampling signal (digital data). When recording an analog signal such as a voltage signal as digital data, the voltage value is sampled at a predetermined cycle. For example, when the voltage value is 0 (Low) when the voltage value is equal to or less than the threshold voltage Vth, and 1 (High) when the voltage value exceeds the threshold voltage Vth, the sampling signal is a rectangular wave as shown in the middle of FIG. Become.

When the sampling signal is read by the data analysis support device 1 and displayed on the graph screen 3, a graph is drawn that is 0 (Low) from T1 to T4, rises at T4, and falls at T6. Although the rough behavior of the original signal can be grasped by looking at such a graph, there is a difference between the time (cross point Tc) when the voltage value of the original signal actually crosses the threshold voltage Vth and the rising time T4 of the sampling signal. Since there is an error in , there may be a problem when strictly comparing with the change timing of other signals.

Therefore, as shown in the lower part of FIG. 6, by selecting and moving only a portion of the graph, it is possible to edit, for example, matching the rising timing of the signal with the position of the cross point Tc. Partial selection of the graph may be performed by, for example, selecting a range by dragging the mouse pointer.

The range of partial movement may be limited to a predetermined range. For example, if the purpose is to correct an error due to a sampling period, it is sufficient to set the movable range in each of the plus and minus directions to be equal to or less than the sampling period.

<Analysis example 1>
Analysis Example 1 is shown in FIGS. 7 to 9. FIG. FIG. 7 shows SLCs installed at the inlet and outlet of a process, respectively. Since the height of the entrance and the height of the exit are different, the SLC 21 on the entrance side and the SLC 22 on the exit side have different numbers of optical axes. In this example, the SLC 21 on the entrance side has 20 optical axes and the SLC 22 on the exit side has 12 optical axes.

FIG. 8 shows an example in which the data analysis support device 1 reads the data series of the individual received light amount for each optical axis of the SLC 21 and the data series of the individual received light amount for each optical axis of the SLC 22 . In the graph of the individual light receiving amount data series, the horizontal axis represents the optical axis (optical axis number), and the vertical axis represents the light receiving amount for each optical axis. When the data series of the two

SLCs

21 and 22 are graphically displayed as they are, the values of the amount of received light are arranged in order from the optical axis number #1. When such graphs are compared, it cannot be determined whether or not there is a correlation between the decrease in the amount of light in the central portion of the SLC 21 and the decrease in the amount of light in the central portion of the SLC 22 . Actually, the SLC 21 and the SLC 22 are installed in a positional relationship as shown in FIG. 7, and the optical axis number #5 of the SLC 21 and the optical axis number #1 of the SLC 22 are arranged at the same height, but as shown in FIG. This is because it is difficult to understand which optical axis of the SLC 21 and SLC 22 correspond to each other in such a graph display.

Therefore, as shown in FIG. 9, the individual light receiving amount graphs of the SLC 22 are moved, and the positions of the optical axes of the two graphs are adjusted so that they are the same as the actual SLC arrangement. By editing the graph in this way, it can be confirmed that the position and size of the light amount reduction portion of SLC 21 and the light amount reduction portion of SLC 22 match, and that the same (or same size) object passed through the entrance and the exit. I understand.

<Analysis example 2>
Analysis Example 2 is shown in FIGS. 10A, 10B, and 11. FIG. FIG. 10A is a schematic diagram of two parallel lines viewed from above. In the line on the left side, the projector 21T and the receiver 21R of the SLC 21 are installed on both sides of the belt conveyor 41 . This SLC 21 ignores light shielding at the timing when the work should pass, and performs control to stop the apparatus when light shielding is detected at the timing when the work should not pass. The apparatus is also stopped when light (disturbance light) from other than the light projector 21T enters the light receiver 21R. Similarly, in the line on the right side, the projector 22T and the receiver 22R of the SLC 22 are installed on both sides of the belt conveyor 42. As shown in FIG. This SLC22 is also controlled in the same manner as the SLC21.

Assume that in the target system shown in FIG. 10A, a problem occurs that the SLC 21 frequently stops the device only on the left line.

The left line and the right line are managed separately, but from experience, it was confirmed that the left line stopped only when the two lines were operated at the same time. Therefore, the user hypothesized that there was some kind of causal relationship between the behaviors of the two lines, and compared the log data of the two lines.

The upper part of FIG. 11 shows the log data of the SLC 21 and the log data of the SLC 22 read into the data analysis support device 1 . Item A is SLC 21 muting information. The muting information is a signal that is ON (High) during a period in which a workpiece passes (a period in which light is ignored) and is OFF (Low) in a machine in which a workpiece does not pass (a period in which light is detected). Item B is a disturbance determination signal for the SLC 21 . The disturbance determination signal is a signal that turns ON (High) when disturbance light is detected by the light receiver 21R. Items C and D are the muting information and the disturbance determination signal of the SLC 22, respectively.

In the upper part of FIG. 11, the muting information of the SLC 22 on the right line and the disturbance determination signal of the SLC 21 on the left line are displayed superimposed on a common time axis. Since the SLC 21 and SLC 22 are different devices and are controlled independently, there is a time lag between the two data sequences. Therefore, simply superimposing two graphs does not tell whether there is a correlation or a causal relationship between the two data series.

Bearing in mind that there is a time lag between SLC21 and SLC22, when the graph of item B is slid to the left, as shown in the lower part of FIG. Assume that it is found that the interval between the graph and the graph of item C matches. From this, it can be seen that there is some kind of relationship between the muting period (that is, the workpiece passing period) on the right line and the disturbance light incident on the SLC 21 on the left line.

Using these analysis results as hints, an on-site investigation was carried out. As a result, as shown in FIG. , incident on the light receiver 21R of the SLC 21 on the left line, causing the device to stop due to disturbance light. If the cause is investigated in this way, countermeasures such as providing a guide for adjusting the posture of the workpiece on the belt conveyor 42 or providing a screen between the SLC 21 and the SLC 22 can be taken promptly.

<Modification>
The above-described embodiment is merely an example of the configuration of the present invention. The present invention is not limited to the specific forms described above, and various modifications are possible within the technical scope of the present invention.

For example, in the graph screen described above, an example of moving the graph along the horizontal axis was shown, but if the common axis is the vertical axis, the graph may be moved along the vertical axis. FIG. 12 is an example in which the graph in FIG. 9 is vertically arranged.

Also, in the graph screen described above, an example of a two-dimensional graph is shown, but a three-dimensional graph may also be displayed. For example, FIG. 9 shows the individual received light amount for each optical axis, and if this is further arranged in the time direction, it becomes a three-dimensional graph of time, optical axis number, and received light amount. By superimposing, for example, safety signal data on the time axis of such a three-dimensional graph, it is possible to superimpose a three-dimensional graph and a two-dimensional graph.

<Appendix>
[1] Data acquisition means (11) for reading a plurality of data series recorded in the target system (2);
For two or more data series having a common axis among the plurality of data series, a graph screen (3) is generated by drawing a graph of each data series with the common axis aligned, and the graph screen (3) is displayed. Graph display means (13) for displaying on the device (16);
providing a user interface (32) for receiving a movement operation for moving at least one data series graph among the two or more data series graph-displayed on the graph screen (3) along the common axis; and an operating means (14) for
A data analysis support device (1), wherein said graph display means (13) updates said graph screen (3) in accordance with an operation received by said user interface (32).

[2] a step of reading a plurality of data series recorded in the target system (2) (S100);
For two or more data series having a common axis among the plurality of data series, a graph screen (3) is generated by drawing a graph of each data series with the common axis aligned, and the graph screen (3) is displayed. a step of displaying on a device (16) (S101);
A user interface (32) accepts a movement operation for moving at least one data series graph among the two or more data series graph-displayed on the graph screen (3) along the common axis. a step (S102);
a step (S103) of updating the graph screen (3) according to the operation received by the user interface (32);
A data analysis support method comprising:

1: Data analysis support device 2: Target system 3:

Graph screens

21C, 22C:

Controllers

21P, 22P:

Power supply devices

21R, 22R:

Light receivers

21T, 22T: Light projector 23: Vibration sensor 30: Graph area 31: Data series list 32 : Move button 33: Reset button 41, 42: Belt conveyor

Claims

a data acquisition means for reading a plurality of data series recorded in the target system;
graph display for generating a graph screen in which a graph of each data series is drawn with the common axis aligned for two or more data series having a common axis among the plurality of data series, and displaying the graph screen on a display device; means and
an operation means for providing a user interface that accepts a movement operation for moving a graph of at least one of the two or more data series graphically displayed on the graph screen along the common axis; have
The data analysis support device, wherein the graph display means updates the graph screen in accordance with an operation accepted by the user interface.
2. The user interface according to claim 1, wherein said user interface receives a movement target selection operation for selecting a data series to be moved from said two or more data series displayed as a graph on said graph screen. data analysis support device.
The user interface includes a partial selection operation for selecting only a portion of the data series graph selected as a movement target, and a partial movement operation for moving only the portion selected by the partial selection operation along the common axis. 3. The data analysis support device according to claim 2, wherein the data analysis support device receives .
4. The user interface receives a display target selection operation for selecting a data series to be displayed as a graph from among the plurality of data series read by the data acquisition means. 1. The data analysis support device according to 1.
5. The display target selection operation is an operation to select an item name of a data series to be displayed as a graph on a list displaying the item names of the plurality of data series. The data analysis support device according to .
The display target selection operation is an operation of dragging and dropping the item name of the data series to be displayed as a graph from the list displaying the item names of the plurality of data series into the graph drawing area on the graph screen. 5. The data analysis support device according to claim 4, characterized by:
The user interface is configured so that, when a data series to be displayed as a graph is selected from among the plurality of data series, a data series that does not have a common axis with the selected data series cannot be selected as a graph to be displayed. 7. The data analysis support device according to any one of claims 4 to 6, wherein the data analysis support device controls to .
The graph screen includes a plurality of graph drawing areas,
8. The user interface according to any one of claims 4 to 7, wherein the user interface receives a drawing area designating operation for designating in which graph drawing area a data series selected as a graph display target is to be displayed. Data analysis support device.
9. The data analysis support device according to claim 1, wherein said graph display means draws a graph before movement and a graph after movement on said graph screen in an identifiable manner. .
10. The data analysis support device according to any one of claims 1 to 9, wherein said operation means restricts movement of the graph within a predetermined range.
11. The data analysis support device according to claim 10, wherein the predetermined range is set to be equal to or less than a sampling period of the data series to be moved.
12. The data analysis support device according to any one of claims 1 to 11, wherein said user interface accepts a movement completion operation for determining a drawing position of said graph after moving the graph.
13. The data analysis support device according to claim 1, further comprising operation history recording means for recording, as an operation history, details of operations performed by the user using the user interface.
14. The data analysis support device according to any one of claims 1 to 13, wherein said graph display means draws information on the amount of movement on said graph screen as additional information of the graph after movement.
15. The data analysis support device according to any one of claims 1 to 14, wherein said user interface accepts a reset operation for returning the graph after movement to its original state.
reading a plurality of data series recorded in the target system;
For two or more data series having a common axis among the plurality of data series, generating a graph screen in which graphs of each data series are drawn with the common axis aligned, and displaying the graph screen on a display device. ,
receiving a movement operation for moving at least one data series graph among the two or more data series graphs displayed on the graph screen along the common axis through the user interface;
updating the graph screen according to the operation received by the user interface;
A data analysis support method comprising:
A program for causing a computer to execute each step of the data analysis support method according to claim 16.