Rolling recording device, rolling recording method, and rolling recording program

Abstract

The rolling recording device stores a plurality of camera images acquired by a plurality of cameras for shooting a plurality of rolling mills; a control signal input to the rolling mill; the measured values of the rolling state are acquired by a plurality of sensors arranged on the rolling production line; the HMI picture information module is used for making HMI picture information of an HMI picture for schematizing a rolling production line; and time information including an acquisition time of the plurality of camera images, an input time of the control signal, and an update time of the HMI screen information. In addition, the rolling recording device executes: an update process for updating the HMI screen information on the basis of at least the measured value of the rolling state; a generation process for generating an output display screen including a display screen of the subject camera image synchronized based on the time information, a display screen of the control signal, and an HMI screen; a display process for displaying the output display screen on a monitor; storage processing: storing the output display picture; and a reproduction process for reproducing the history of the output display screen in response to the request.

Description

Technical Field

[0001] The present disclosure relates to a technique for recording the status of a rolling line. Background Art

[0002] Patent document 1 discloses a material recording device for recording the material of a rolled material. The material recording device records material data obtained by measuring the material of the rolled material by a sensor, process data obtained by measuring the rolling process by a sensor, and image data obtained by capturing the state of the rolled material by a camera. The material recording device reads out the various recorded data (material data, process data, image data) and displays the data continuously or partially. Thus, even if an abnormality occurs in the material, it is easy to determine the cause.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2007-083300 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Consider a case where an abnormality occurs in a rolling line having multiple rolling mills. In this case, the operator cannot immediately understand in which rolling mill the abnormality occurs only through the various data shown in Patent Document 1, so it may take a lot of time to find out the cause. On the other hand, the operator uses an HMI screen that schematically illustrates the rolling line to operate the rolling line. Therefore, it is hoped that the structure in which the operator can easily understand the rolling state of the rolling line by not only obtaining information from sensors and camera image information but also using the HMI screen is improved. As a result, it is expected that the operator can smoothly find out the cause when an abnormality occurs.

[0008] An object of the present disclosure is to provide a technology that enables an operator to easily grasp the rolling status of a rolling line using information including an HMI screen.

[0009] Means for solving problems

[0010] The first aspect of the present disclosure relates to a rolling recording device for recording the rolling state of a rolling line in which a plurality of rolling mills are arranged in sequence from the upstream side. The rolling recording device includes one or more processors and one or more storage devices. The one or more storage devices store: a plurality of camera images acquired by a plurality of cameras for photographing a plurality of rolling mills; control signals input to the rolling mills; measured values ​​of the rolling state acquired by a plurality of sensors arranged in the rolling line; HMI screen information for making an HMI screen schematically illustrating the rolling line; and time information including the acquisition time of the plurality of camera images, the input time of the control signal, and the update time of the HMI screen information. The one or more processors execute: an update process for updating the HMI screen information based on at least the measured value of the rolling state; a generation process for generating an output display screen, the output display screen including a display screen of the object camera image synchronized based on the time information, a display screen of the control signal, and an HMI screen; a display process for displaying the output display screen on a monitor; a save process for saving the output display screen; and a reproduction process for reproducing the history of the output display screen according to a request.

[0011] The second aspect of the present disclosure is based on the first aspect and has the following features: The generation process includes synchronizing the timing of the first information corresponding to the latest time among the acquisition time of the object camera image, the input time of the control signal, and the update time of the HMI screen information, and the timing of the second information and the third information different from the first information.

[0012] The third aspect of the present disclosure has the following features in addition to the first aspect: In the display process, when a camera screen corresponding to a rolling mill in which an abnormality is detected is selected as a target camera image, the one or more processors emphatically display the display screen of the target camera image.

[0013] The fourth aspect of the present disclosure has the following features in addition to the first aspect: During the reproduction process, the one or more processors display a mark indicating the reproduction position in a superimposed manner on the display screen of the control signal.

[0014] The fifth aspect of the present disclosure relates to a rolling recording method for recording the rolling state of a rolling production line in which a plurality of rolling mills are arranged in sequence from the upstream side. The rolling recording method includes: acquiring a plurality of camera images acquired by a plurality of cameras for photographing the plurality of rolling mills; acquiring a control signal input to the rolling mill; acquiring a measured value of the rolling state acquired by a plurality of sensors provided in the rolling production line; updating HMI screen information based at least on the measured value of the rolling state, the HMI screen information being used to create an HMI screen that schematically illustrates the rolling production line; acquiring time information including the acquisition time of the plurality of camera images, the input time of the control signal, and the update time of the HMI screen information; generating an output display screen, the output display screen including a display screen of the object camera image synchronized based on the time information, a display screen of the control signal, and an HMI screen; displaying the output display screen on a monitor; saving the output display screen; and reproducing the history of the output display screen according to a request.

[0015] The sixth aspect of the present disclosure relates to a rolling recording program that records the rolling state of a rolling production line in which a plurality of rolling mills are arranged in sequence from the upstream side. The rolling recording program causes a computer to execute: acquiring a plurality of camera images acquired by a plurality of cameras that photograph a plurality of rolling mills; acquiring a control signal input to the rolling mill; acquiring a measured value of the rolling state acquired by a plurality of sensors provided in the rolling production line; updating HMI screen information based at least on the measured value of the rolling state, the HMI screen information being used to create an HMI screen that schematically illustrates the rolling production line; acquiring time information including the acquisition time of the plurality of camera images, the input time of the control signal, and the update time of the HMI screen information; generating an output display screen, the output display screen including a display screen of the object camera image synchronized based on the time information, a display screen of the control signal, and an HMI screen; displaying the output display screen on a monitor; saving the output display screen; and reproducing the history of the output display screen according to a request.

[0016] Effects of the Invention

[0017] According to the present disclosure, an output display screen including a display screen of an object camera image, a display screen of a control signal, and an HMI screen is generated, and the display screen of the object camera image, the display screen of the control signal, and the HMI screen are synchronized based on time information including the acquisition time of multiple camera images, the input time of the control signal input to the rolling mill, and the update time of HMI screen information for making an HMI screen that schematically illustrates the rolling production line. In addition, a process of saving the output display screen displayed on the monitor and a process of reproducing the history of the output display screen according to a request are performed. As a result, the operator can easily grasp the rolling status of the rolling production line. Therefore, the operator can smoothly identify the cause and perform maintenance when an abnormality occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram for explaining the outline of the rolling recording system.

[0019] Figure 2 : is a block diagram showing a configuration example of a rolling recording device according to an embodiment.

[0020] Figure 3 : is a block diagram showing an example of rolling record processing according to the embodiment.

[0021] Figure 4 It is an explanatory diagram showing a specific example of the synchronization process according to the embodiment.

[0022] Figure 5 It is an explanatory diagram showing a specific example of the reproduction process according to the embodiment. DETAILED DESCRIPTION

[0023] The rolling recording device, the rolling recording method, and the rolling recording program according to the embodiment of the present disclosure will be described with reference to the accompanying drawings. In addition, the same reference numerals are attached to the common elements in each figure, and the repeated description is omitted.

[0024] 1. Overview of the rolling recording system

[0025] Figure 1 This is a diagram for explaining the outline of a rolling recording system 1. The rolling recording system 1 records the rolling state of a rolling production line 2. The rolling production line 2 is, for example, a hot rolling production line or a cold rolling production line. The rolling production line 2 includes a plurality of rolling mills 4 arranged in parallel along the conveying direction of the rolled material 3. That is, the rolling production line 2 is sequentially configured with a plurality of rolling mills 4 from the upstream side.

[0026] The rolling production line 2 is further provided with a plurality of cameras 5 and a plurality of sensors 6. The plurality of cameras 5 photograph the plurality of rolling mills 4. The plurality of cameras 5 are, for example, arranged to be able to photograph the plurality of rolling mills 4 from a predetermined direction. The plurality of cameras 5 may be arranged for each rolling mill 4 or for each set of rolling mills 4. A set of rolling mills 4 refers to two or more rolling mills 4 included in the field of view of the camera 5. The plurality of camera images acquired by the plurality of cameras 5 are input to the rolling recording device 10.

[0027] The multiple sensors 6 measure the rolling state of the rolled material 3. The multiple sensors 6 can be set, for example, at the input side of the rolling mill 4 at the beginning (most upstream side) of the conveying direction of the rolled material 3, or at the output side of the rolling mill 4 at the end (most downstream side) of the conveying direction of the rolled material 3, or between the rolling mills 4. That is, the multiple sensors 6 are arranged in various places. As examples of the multiple sensors 6, a plate speed meter, a plate thickness meter, etc. are exemplified. In addition, the information obtained by the multiple sensors 6 is input to the controller 8.

[0028] The plurality of rolling mills 4 each include an actuator 7 and are driven by the actuator 7. The actuator 7 is provided for each rolling mill 4. The actuator 7 is driven and controlled according to a control signal output from a controller 8. The control signal output from the controller 8 is, for example, a parameter input to the actuator 7. As parameters, there are exemplified the rotation speed of the roll included in the rolling mill 4, the opening of the roll, and the like. The parameters input to the actuator 7 may be generated by the controller 8 or by the rolling recording device 10.

[0029] The rolling recording system 1 includes the above-mentioned rolling line 2 , a controller 8 , a rolling recording device 10 , and a monitor 11 .

[0030] The controller 8 performs various processes. Specifically, the controller 8 performs sequential control of the control signal input to the actuator 7 and control of sending the specified information to the rolling recording device 10. The specified information includes the sensor acquisition information acquired by the sensor 6 (also referred to as the measured value of the rolling state). In addition, the specified information may include relevant information of the control signal (information of the control signal input to the actuator 7, the input time of the control signal, etc.).

[0031] The controller 8 may include, for example, one or more processors (not shown) and one or more storage devices (not shown), or one or more dedicated hardware (not shown). As a specific example, the controller 8 is a PLC (Programmable Logic Controller).

[0032] The rolling recording device 10 records the rolling state of the rolling line 2 as an image. Specifically, the rolling recording device 10 generates an output display screen to be displayed on the monitor 11. The output display screen includes a plurality of display screens.

[0033] exist Figure 1 In the example shown, the output display screen is composed of a first display screen, a second display screen, and a third display screen. For example, the first display screen displays a target camera image among a plurality of camera images acquired by a plurality of cameras 5, the second display screen displays an HMI screen, and the third screen displays a control signal input to the rolling mill 4 (actuator 7). In addition, each of the plurality of display screens may be displayed on the same monitor 11 or may be displayed on each monitor 11.

[0034] The HMI screen is a screen schematically showing the rolling line 2. The HMI screen displays, for example, the measured values ​​of the rolling state acquired by the plurality of sensors 6. The HMI screen is displayed, for example, by executing a program generated by a dedicated HMI tool. The HMI screen is updated based on at least the measured values ​​of the rolling state.

[0035] Then, the rolling recording device 10 displays (outputs) the generated output display screen on the monitor 11. Hereinafter, details of a specific example of the rolling recording device 10 will be described.

[0036] 2. Example of rolling recording device

[0037] 2-1. Structural example

[0038] Figure 2 1 is a block diagram showing a configuration example of a rolling recording device 10 according to an embodiment.

[0039] The rolling record device 10 includes one or more processors 20 (hereinafter referred to as the processor 20) and one or more storage devices 30 (hereinafter referred to as the storage device 30). The processor 20 performs rolling record processing. As the processor 20, a CPU (Central Processing Unit) is exemplified. The storage device 30 stores various information required for the processing of the processor 20. As the storage device 30, a volatile memory, a non-volatile memory, a HDD (Hard Disk Drive), an SSD (Solid State Drive), etc. are exemplified. The details of the rolling record processing performed by the processor 20 will be described later.

[0040] The rolling record program (not shown) is a computer program executed by the processor 20. The various functions of the rolling record device 10 can also be realized by executing the rolling record program by the processor 20. The rolling record program is stored in the storage device 30. Alternatively, the rolling record program can also be recorded in a computer-readable storage medium.

[0041] The various types of information stored in the storage device 30 include camera image information 31 , sensor acquisition information 32 , control signal information 33 , HMI screen information 34 , and time information 35 .

[0042] As described above, the camera image information 31 is camera images captured by the plurality of cameras 5 .

[0043] As described above, the sensor acquisition information 32 is the actual measurement value of the rolling state acquired by the plurality of sensors 6 installed in the rolling line 2 .

[0044] As described above, the control signal information 33 includes control signals respectively input to the plurality of rolling mills 4 (actuators 7).

[0045] The HMI screen information 34 is information for creating an HMI screen schematically representing the rolling line 2. The HMI screen information 34 is a program generated by, for example, a dedicated HMI tool.

[0046] The timing information 35 includes the acquisition timing of the plurality of camera images, the input timing of the control signal input to the rolling mill 4 (actuator 7), and the update timing of the HMI screen information 34. The update timing of the HMI screen information 34 is, for example, the timing when the update of the HMI screen information 34 is completed. The update of the HMI screen information 34 is performed based on at least the sensor acquisition information 32 (actually measured value of the rolling state).

[0047] 2-2. Processing example

[0048] Figure 3 2 is a block diagram showing an example of rolling record processing according to an embodiment. The rolling record processing executed by the processor 20 includes an HMI screen update processing 21, a display object selection processing 22, a synchronization processing 23, an output display screen generation processing 24, a monitor display processing 25, an output display screen storage processing 26, and an output display screen history reproduction processing 27.

[0049] The processor 20 executes processing in the order of, for example, an HMI screen update process 21, a display object selection process 22, a synchronization process 23, an output display screen generation process 24, a monitor display process 25, an output display screen storage process 26, and an output display screen history playback process 27. The following describes each process in detail.

[0050] In the HMI screen update process 21 , the processor 20 updates the HMI screen information 34 based on at least the sensor acquisition information 32 (such as the actual measurement value of the rolling state).

[0051] In the display object selection process 22, the processor 20 selects a target camera image to be displayed on the output display screen from a plurality of camera images based on the camera image information 31. The target camera image may be one or more than two. Then, the processor 20 selects a control signal input to the rolling mill 4 (actuator 7) corresponding to the target camera image based on the control signal information 33. In addition, the processor 20 selects a screen to be displayed on the monitor 11. The screen to be displayed on the monitor 11 selects at least three of the target camera image, the control signal, and the updated HMI screen. The control signal displayed on the monitor 11 may also display only the control signal corresponding to the target camera image.

[0052] In the synchronization process 23, the processor 20 obtains the acquisition time (first time) of the object camera image, the input time (second time) of the control signal, and the update time (third time) of the HMI screen based on the time information 35. Then, the processor 20 synchronizes the object camera image, the control signal, and the updated HMI screen based on the first time, the second time, and the third time. The details of the synchronization process 23 will be described later.

[0053] In the output display screen generation process 24, the processor 20 generates an output display screen including a display screen of the target camera image (first display screen), a display screen of the control signal (second display screen), and an HMI screen (third display screen). In addition, the second display screen and the third display screen are respectively encoded for conversion into the same format as the first display screen.

[0054] In the monitor display process 25, the processor 20 displays (outputs) the output display screen on the monitor 11. Specifically, the output display screen is output to the monitor 11 after being converted into a frame rate corresponding to the monitor 11.

[0055] In the output display screen storage process 26, the processor 20 captures the output display screen output to the monitor 11 according to the operation from the operator. The image of the output display screen captured is called the history of the output display screen. The history of the output display screen is stored in the storage device 30. In addition, the time period when the output display screen is captured is determined by the operation from the operator.

[0056] In the reproduction process 27 of the history of the output display screen, the processor 20 reproduces the history of the output display screen based on the operation from the operator. The details of the reproduction process 27 of the history of the output display screen will be described later.

[0057] 2-3. Example of synchronous processing

[0058] Figure 4 1 is an explanatory diagram showing a specific example of the synchronization process 23 according to the embodiment. The synchronization process 23 based on the acquisition time of the camera image, the input time of the control signal, and the update time of the HMI screen information 34 included in the time information 35 is considered.

[0059] The acquisition time of the camera image depends on, for example, the distance between the camera 5 and the rolling recording device 10. In this case, the shorter the distance, the earlier the acquisition time of the camera image, and the longer the distance, the later the acquisition time of the camera image.

[0060] The input time of the control signal depends on, for example, the distance between the rolling mill 4 and the rolling recording device 10, and the waiting time from the generation of the control signal to the input to the rolling mill 4. In this case, the shorter the distance, the earlier the input time of the control signal, and the longer the distance, the later the input time of the control signal. In addition, the shorter the waiting time, the earlier the input time of the control signal, and the longer the waiting time, the later the input time of the control signal. In addition, the waiting time is determined by the sequential control of the controller 8.

[0061] Consider the update time of the HMI screen information 34. The HMI screen is updated based on the sensor acquisition information 32 (measured value of the rolling state). Therefore, the update time of the HMI screen information depends on, for example, the distance between the sensor 6 and the rolling recording device 10 and the time required for updating the HMI screen. In this case, the shorter the distance, the earlier the update time of the HMI screen information 34, and the longer the distance, the later the update time of the HMI screen information 34. In addition, the shorter the time required for updating the HMI screen, the earlier the update time of the HMI screen information 34, and the longer the time required for updating the HMI screen, the later the update time of the HMI screen information 34.

[0062] Thus, the target camera image displayed on the first display screen of the output display screen, the control signal displayed on the second display screen, and the HMI screen displayed on the third display screen have different timings. Therefore, it is necessary to synchronize them in a manner consistent with the timing of any one of the target camera image, the control signal, and the HMI screen.

[0063] According to this embodiment, the rolling recording device 10 (processor 20) synchronizes the timing of the information (first information) corresponding to the latest moment among the acquisition moment of the object camera image, the input moment of the control signal, and the update moment of the HMI screen information based on the time information 35, and the timing of the second information and the third information different from the first information.

[0064] Specifically, the processor 20 extracts the first information corresponding to the latest time among the acquisition time of the target camera image, the input time of the control signal, and the update time of the HMI screen information. Then, the processor 20 subtracts the time of the first information from the time of the second information, and subtracts the time of the first information from the time of the third information. In addition, the processor 20 delays the timing of each of the second information and the third information based on the time obtained by subtraction.

[0065] exist Figure 4 In the example shown, the control signal input time, the object camera image acquisition time, and the HMI screen update time are acquired in this order. In this case, the timing of the control signal and the object camera image are synchronized with the timing of the HMI screen corresponding to the latest time. In this way, all information displayed on the output display screen can be synchronized.

[0066] 2-4. Example of reproduction processing

[0067] Figure 52 is an explanatory diagram showing a specific example of the reproduction process 27 of the history of the output display screen according to the embodiment. The rolling recording device 10 (processor 20) reproduces the history of the output display screen based on the instruction from the operation button of the operator. The reproduction screen is used in the reproduction of the history of the output display screen. The reproduction screen may include only the output display screen, or may include a plurality of output display screens. Figure 5 As shown, the display screen includes an output display screen and a control button screen. In addition, the control button screen may also be a display of a touch panel that can be operated by the operator. Examples of the operation buttons include a playback button, a reverse button, a stop button, a pause button, a slow motion button, a fast forward button, a fast rewind button, and a repeat button.

[0068] Consider a method of displaying a control signal displayed on the third display screen of the output display screen when the reproduction process 27 of the history of the output display screen is executed. Figure 5 As shown in FIG. 1 , when the control signal of the third display screen is displayed as a curve graph, the operator cannot understand where the reproduction position is located on the graph. Therefore, the processor 20 overlaps and displays a mark indicating the reproduction position on the third display screen. The reproduction position refers to the current frame. Thus, the operator can understand where the reproduction position is located on the graph.

[0069] 3. Modifications

[0070] 3-1. First Example

[0071] In the above Figure 3 In the example shown, after the synchronization process 23 is executed, in the output display screen generation process 24, a display screen of the object camera image (first display screen), a display screen of the control signal (second display screen), and an HMI screen (third display screen) are generated respectively. However, this is not limited to this. For example, in the output display screen generation process 24, the synchronization process 23 may be executed from the generation of the first display screen, the second display screen, and the third display screen to the generation of the output display screen. That is, the synchronization process 23 may also be included in the output display screen generation process 24.

[0072] 3-2. Second Example

[0073] During the display of the output display screen, the camera image displayed on the display screen (first display screen) of the target camera image may be switched to another camera image. In this case, the processor 20 re-executes the above-mentioned display object selection process 22, synchronization process 23, output display screen generation process 24 and monitor display process 25.

[0074] 3-3. Third Example

[0075] When the camera screen corresponding to the rolling mill 4 in which the abnormality is detected is selected as the target camera image, the display screen (first display screen) of the target camera image can also be highlighted. Thus, the operator can move his / her sight to the highlighted image. Therefore, the rolling mill 4 in which the abnormality is detected can be easily grasped.

[0076] 4. Effect

[0077] According to the rolling recording device 10 involved in the embodiment, an output display screen including a display screen of an object camera image, a display screen of a control signal, and an HMI screen is generated, wherein the display screen of the object camera image, the display screen of the control signal, and the HMI screen are synchronized based on time information including the acquisition time of multiple camera images, the input time of the control signal input to the rolling mill, and the update time of the HMI screen information for making an HMI screen that schematically illustrates the rolling production line. In addition, a process of saving the output display screen displayed on the monitor and a process of reproducing the history of the output display screen according to a request are performed. As a result, the operator can easily grasp the rolling status of the rolling production line. Therefore, the operator can smoothly identify the cause and perform maintenance when an abnormality occurs.

[0078] Description of symbols

[0079] 1…Rolling recording system, 2…Rolling production line, 3…Rolling material, 4…Rolling mill, 5…Camera, 6…Sensor, 7…Actuator, 8…Controller, 10…Rolling recording device, 11…Monitor, 20…Processor, 21…HMI screen update processing, 22…Display object selection processing, 23…Synchronization processing, 24…Output display screen generation processing, 25…Monitor display processing, 26…Output display screen storage processing, 27…Output display screen history playback processing, 30…Storage device, 31…Camera image information, 32…Sensor acquisition information, 33…Control signal information, 34…HMI screen information, 35…Time information

Claims

1. A rolling recording device for recording the rolling state of a rolling production line in which a plurality of rolling mills are arranged in sequence from the upstream side, characterized in that: have: one or more processors; and one or more storage devices, The one or more storage devices store: a plurality of camera images acquired by a plurality of cameras photographing the plurality of rolling mills; a control signal input to the rolling mill; Actual measured values ​​of rolling conditions obtained by a plurality of sensors arranged in the rolling production line; HMI screen information for creating an HMI screen schematically illustrating the rolling production line; and time information including the acquisition time of the plurality of camera images, the input time of the control signal and the update time of the HMI screen information, The one or more processors are configured to perform: Update processing, updating the HMI screen information based at least on the measured value of the rolling state; generating a display screen including a display screen of the target camera image synchronized based on the time information, a display screen of the control signal, and the HMI screen; Display processing, displaying the output display image on a monitor; Saving processing, saving the output display screen; as well as The reproduction process reproduces the history of the output display screen in response to the request.

2. The rolling recording device according to claim 1, characterized in that: The generation process includes synchronizing the timing of first information corresponding to the latest time among the acquisition time of the target camera image, the input time of the control signal, and the update time of the HMI screen information with the timing of each of second information and third information different from the first information.

3. The rolling recording device according to claim 1, characterized in that: The one or more processors are configured to, in the display processing, highlight and display the display screen of the target camera image when a camera screen corresponding to the rolling mill in which an abnormality is detected is selected as the target camera image.

4. The rolling recording device according to claim 1, characterized in that: The one or more processors are configured to display a mark indicating a reproduction position superimposed on a display screen of the control signal during the reproduction process.

5. A rolling recording method for recording the rolling state of a rolling production line having a plurality of rolling mills arranged in sequence from the upstream side, characterized in that: include: acquiring a plurality of camera images acquired by a plurality of cameras photographing the plurality of rolling mills; Obtaining a control signal input to the rolling mill; Acquiring actual measured values ​​of rolling states acquired by a plurality of sensors disposed on the rolling production line; updating HMI screen information based at least on the measured value of the rolling state, the HMI screen information being used to create an HMI screen schematically illustrating the rolling production line; Acquire time information including acquisition time of the plurality of camera images, input time of the control signal, and update time of the HMI screen information; generating an output display screen, the output display screen including a display screen of the target camera image synchronized based on the time information, a display screen of the control signal, and the HMI screen; Displaying the output display image on a monitor; Saving the output display screen; as well as The history of the output display screen is reproduced in response to the request.

6. A rolling recording program for recording the rolling state of a rolling production line in which a plurality of rolling mills are arranged in sequence from the upstream side, characterized in that: The rolling record program causes the computer to perform: acquiring a plurality of camera images acquired by a plurality of cameras photographing the plurality of rolling mills; Obtaining a control signal input to the rolling mill; Acquiring actual measured values ​​of rolling states acquired by a plurality of sensors disposed on the rolling production line; updating HMI screen information based at least on the measured value of the rolling state, the HMI screen information being used to create an HMI screen schematically illustrating the rolling production line; Acquire time information including acquisition time of the plurality of camera images, input time of the control signal, and update time of the HMI screen information; generating an output display screen, the output display screen including a display screen of the target camera image synchronized based on the time information, a display screen of the control signal, and the HMI screen; Displaying the output display image on a monitor; Saving the output display screen; as well as The history of the output display screen is reproduced in response to the request.

Images