JP7113880B2 - Operation monitoring device and operation monitoring method - Google Patents

Description

The present invention relates to an operation monitoring device and an operation monitoring method.

2. Description of the Related Art Conventionally, automation of production lines and improvement of operating rates have been promoted for the purpose of improving productivity in factories. In order to improve the operating rate of automated production lines, it is important to monitor the production line, promptly implement restoration work when the production line stops, and investigate the cause.

Regarding the monitoring of a production line, for example, Patent Document 1 describes an operation record acquisition unit that acquires time-series data of each of a plurality of indicators representing the operation record of a monitoring target, and a total index generation unit that generates time-series data of a total index by synthesizing values of a plurality of indexes at the same point in time; and a change point detection unit that detects a point at which appears as a change point of the state of the monitored object."

JP 2015-152933 A

According to the monitoring device described in Patent Literature 1, it is possible to easily monitor the state of the monitored object, and detect an abnormality of the monitored object or a state change that is a sign thereof. However, when a production line is actually stopped, recovery methods and cause investigations depend on the experience and intuition of skilled workers, so there are cases where prompt recovery work cannot be carried out.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and is capable of presenting to the user at least one of the cause and recovery method when a change in the operating state such as stop occurs in the production line. for the purpose.

The present application includes a plurality of means for solving at least part of the above problems, and examples thereof are as follows.

In order to solve the above problems, an operation monitoring apparatus according to an aspect of the present invention includes an information acquisition unit that acquires sensor information representing the state of a device arranged on a production line, and a time corresponding to the acquired sensor information. a sensor performance database stored with the sensor performance database; a change point extraction unit that extracts a change point of the sensor information by referring to the sensor performance database; A recovery method master database in which at least the content of the change point of the sensor information that has occurred and the recovery method are recorded in association with each other, and the change point of the sensor information that occurred in the stopped device immediately before the stop are search conditions. and a search unit that searches for a corresponding recovery method by referring to the recovery method master database, and a display control unit that displays a search result display screen showing the retrieved recovery method.

According to the present invention, when a change in operating conditions such as stoppage occurs in a production line, at least one of the cause and recovery method can be presented to the user, and the stoppage time can be shortened by early recovery of the production line. can be planned.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

FIG. 1 is a diagram showing a configuration example of an operation monitoring device according to one embodiment of the present invention. FIG. 2 is a diagram illustrating an example of the data structure of an equipment operation DB. FIG. 3 is a diagram illustrating an example of the data structure of a prediction master DB; FIG. 4 is a diagram showing an example of the data structure of the recovery method master DB. FIG. 5 is a flowchart illustrating an example of operation monitoring processing. FIG. 6 is a diagram showing a display example of the operating state display screen. FIG. 7 is a diagram showing a display example of an alert list screen. FIG. 8 is a diagram showing a display example of a search result display screen. FIG. 9 is a flowchart illustrating another example of operation monitoring processing. FIG. 10 is a diagram showing another display example of the operating state display screen.

An embodiment of the present invention will be described below with reference to the drawings. In principle, the same members are denoted by the same reference numerals in all the drawings for describing the embodiments, and repeated description thereof will be omitted. In addition, in the following embodiments, it goes without saying that the constituent elements (including element steps and the like) are not necessarily essential, unless otherwise specified or clearly considered essential in principle. stomach. In addition, when saying "consisting of A", "consisting of A", "having A", or "including A", other elements are excluded unless it is explicitly stated that only those elements are included. It goes without saying that it is not something to do. Similarly, in the following embodiments, when referring to the shape, positional relationship, etc. of components, etc., unless otherwise explicitly stated or in principle clearly considered to be otherwise, the actual shape, etc. shall include those that are similar or similar to

<Configuration example of operation monitoring device 10 according to one embodiment of the present invention>
FIG. 1 shows a configuration example of an operation monitoring device 10 according to one embodiment of the present invention.

The operation monitoring device 10 is for displaying the recovery method and cause on the screen of the information terminal 40 when the production line is stopped.

The operation monitoring device 10 includes functional blocks of a processing unit 11 , a storage unit 12 , an input unit 13 , an output unit 14 and a communication unit 15 .

The operation monitoring device 10 includes a processor such as a CPU (Central Processing Unit), a memory such as a DRAM (Dynamic Random Access Memory), a storage such as a HDD (Hard Disk Drive) and an SSD (Solid State Drive), a keyboard, a mouse, a touch panel, and the like. , an output device such as a display, and a general computer such as a personal computer equipped with a communication module such as a NIC (Network Interface Card).

The processing unit 11 is realized by a processor of a computer. The processing unit 11 has functional blocks of an information acquisition unit 111 , a change point extraction unit 112 , an operating state prediction unit 113 , a master editing unit 114 , a search unit 115 and a display control unit 116 . These functional blocks are realized by the processor of the computer executing a given program loaded into the memory. However, some or all of these functional blocks may be implemented as hardware using an integrated circuit or the like.

The information acquisition unit 111 is connected to the sensor 32 provided in each device (devices such as device A and device B (FIG. 6)) of the equipment 31 constituting the production line 30 via the communication unit 15 and the network 20. Then, sensor information indicating the state of each device constituting the facility 31 detected by the sensor 32 is acquired. The information acquisition unit 111 records the acquired sensor information in the sensor performance DB (database) 121 of the storage unit 12 . The sensor 32 detects whether each device constituting the facility 31 is in operation or is stopped, and also determines whether the lot of the member input as a processing target to each device is changed, and the operator on the machine side is changed. , the temperature, pressure, sound, and vibration of each device, as well as abnormalities in processed products output from each device (dimensional abnormalities, transfer position abnormalities, etc.) can be detected.

The change point extraction unit 112 refers to the sensor performance DB 121 , extracts change points in the sensor information, and records the extraction results in the facility operation DB 122 of the storage unit 12 . Here, the change point of the sensor information is, for example, the timing at which each device constituting the facility 31 is stopped, the lot of the member to be processed is replaced, the temperature, pressure, sound, vibration, etc. of each device. exceeds a predetermined reference value, or the timing when the temperature, pressure, sound, vibration, etc. of each device changes from an increase to a decrease, or when a decrease turns to an increase.

The operating state prediction unit 113 refers to the prediction master DB 123 of the storage unit 12 and predicts changes in the operating state that may occur in the production line 30 in the future.

The master editing unit 114 edits the prediction master DB 123, the process master DB 124, and the recovery method master DB 125 stored in the storage unit 12 based on the input from the user.

When a device that constitutes equipment 31 of production line 30 is stopped, retrieval unit 115 searches for a recovery method from recovery method master BD 125 using, as a search condition, a point of change in sensor information immediately before the stop occurring in the stopped device. Search for.

The display control unit 116 refers to each DB in the storage unit 12 to generate various screens (for example, an operating state display screen 200 ( FIG. 6 ) representing the operating state of the production line 30, etc.), and displays them on the display of the information terminal 40. display.

The storage unit 12 is realized by computer memory and storage. The storage unit 12 stores a sensor performance DB 121, an equipment operation DB 122, a prediction master DB 123, a process master DB 124, and a recovery method master DB 125. The storage unit 12 may store information other than these.

The sensor performance DB 121 and the facility operation DB 122 are used to display the operating state display screen 200 (FIG. 6).

Time-series sensor information acquired by the information acquisition unit 111 is recorded in the sensor performance DB 121 .

The facility operation DB 122 is used by the operation state prediction unit 113 to predict the operation state. FIG. 2 shows an example of the data structure of the facility operation DB 122. As shown in FIG. In the equipment operation DB 122, the operation status (in operation, contents of change points of sensor information, stopped, etc.) is recorded in chronological order for each device. As the content of the change point, for example, a part lot change, a state in which temperature, pressure, sound, vibration, etc. exceed predetermined reference values, and the like are recorded. In the example shown in the figure, equipment A started operating at 08:00, experienced abnormal vibrations during the period from 10:00 to 10:27, and stopped during the period from 11:15 to 11:46. is recorded.

The prediction master DB 123 is used by the operating state prediction unit 113 to predict the operating state. FIG. 3 shows an example of the data structure of the prediction master DB 123. As shown in FIG. In the prediction master DB 123, for each prediction logic ID, devices, change point conditions (contents of change in sensor information), and prediction results (contents of change in operating state) are recorded in association with each other. In the example shown in the figure, the prediction logic ID=P0001 indicates that when a pressure value drop is extracted as a change point of the sensor information of the device A, a dimensional abnormality of the processed product is predicted thereafter. Similarly, the prediction logic ID=P0002 indicates that when an abnormal vibration is extracted as a change point of the sensor information of the device B, an abnormality in the conveying position of the processed product is predicted after that.

Return to FIG. The process master DB 124 is used to display the operating state display screen 200 (FIG. 6). In the process master DB 124, the layout of each device constituting the equipment 31 of the production line 30, the workers, the members to be processed, etc. are associated and recorded.

The recovery method master DB 125 is used to display the search result display screen 220 (FIG. 8). FIG. 4 shows an example of the data structure of the recovery method master DB 125. As shown in FIG. The recovery method master DB 125 stores, for each device that constitutes the equipment 31, details of changes in sensor information that occurred immediately before the device stopped when the device stopped in the past, an alarm confirmation method, a cause of the stop, and the recovery method are recorded in association with each other. In the case of FIG. 10, a decrease in pressure value is recorded as the content of change in device A, visual inspection of machine-side sensors is recorded as the alarm confirmation method, insufficient pressure is recorded as the cause of stoppage, and gasket replacement is recorded as the restoration method.

The input unit 13 is realized by an input device of the computer. The input unit 13 receives various operations from the user (for example, editing operation of the prediction master DB 123 or the like). The output unit 14 is implemented by an output device of the computer. The output unit 14 displays an editing screen such as the prediction master DB 123, for example.

The communication unit 15 is realized by a communication module of a computer. The communication unit 15 is connected to the sensor 32 and the information terminal 40 of the production line 30 via the network 20, and communicates predetermined data.

The network 20 is a two-way communication network including a LAN (Local Area Network), a WAN (Wide Area Network), a mobile phone communication network, and the like.

A production line 30 includes equipment 31 composed of a plurality of devices, and sensors 32 provided for each device.

The information terminal 40 consists of a general computer, and is used by various levels of users such as supervisors, managers, and maintenance personnel of the production line 30 . The information terminal 40 displays an operating state display screen 200 (FIG. 6) and the like based on the data transmitted from the operation monitoring device 10. FIG.

<Operation monitoring processing by operation monitoring device 10>
Next, FIG. 5 is a flowchart illustrating an example of operation monitoring processing by the operation monitoring device 10. As shown in FIG.

The operation monitoring process is started when the production line 30 starts operating.

First, the information acquisition unit 111 acquires sensor information from the sensor 32 of the production line 30 via the communication unit 15 and the network 20, and records the acquired sensor information in the sensor performance DB 121 of the storage unit 12 (step S1). .

Next, the display control unit 116 refers to the sensor performance DB 121 of the storage unit 12, generates an operating state display screen 200 (FIG. 6) representing the operating state of the production line 30, and displays it on the display of the information terminal 40 ( step S2).

Next, the change point extraction unit 112 performs analysis for extracting a change point in the sensor information recorded in the sensor performance DB 121 (step S3), and determines whether or not a change point has been extracted (step S4 ). Here, if the change point extraction unit 112 determines that a change point has been extracted (YES in step S4), the change point extraction unit 112 records the extracted change point in the equipment operation DB 122, and the display control unit 116 , the equipment operation DB 122 is referred to, and the operation state display screen 200 is updated based on the extracted change points (step S5).

If the change point extraction unit 112 determines that no change point has been extracted (NO in step S4), step S5 is skipped.

After that, the process returns to step S1, and steps S1 to S5 are repeated until the operation of the production line 30 is completed.

FIG. 6 shows a display example of the operation state display screen 200 displayed on the display of the information terminal 40 by the operation monitoring process described above.

A current status display area 201 and a chronological display area 204 are provided on the operating state display screen 200 .

In the current status display area 201, icons corresponding to each of a plurality of devices constituting the equipment 31 of the production line 30 are arranged in order of process. In the case of the figure, the production line 30 includes A device, B device, C device, D device and D1 device, E device, F device and F1 device, G device, H device, and I device and I1 device) in order. It shows that it is placed.

A device, B device, C device, E device, G device, and H device each perform one process operation, D device and D1 device, F device and F1 device, and I device and I1 device , respectively, indicating that one step of work is performed by two devices. Therefore, in the case of the figure, the production line 30 is composed of nine processes.

The icon corresponding to each device is accompanied by the standard process time of each device. For example, the standard process time for the A device is 12.9s. The icon is highlighted when there is a change in sensor information from the corresponding device, and alert marks 202 and 203 are superimposed on the upper right. Icon highlighting is performed, for example, by changing the color or brightness of the icon, blinking, or the like, depending on the content and degree of change.

An alert mark 202 with an exclamation mark "!" displayed in a circle indicates that the corresponding device is stopped. An alert mark 203 in which an exclamation point “!” is displayed in a triangle indicates that the corresponding device has not stopped but the sensor information has changed. Note that the alert marks 202 and 203 may be changed in color and blinking frequency according to the content and degree of change. In the case of the figure, the A device and the B device are stopped, and although the F1 device is not stopped, the sensor information has changed.

In the chronological display area 204, the period during which the sensor information changes and the details of the change are displayed chronologically for each process of the production line 30. FIG. In the case of the same figure, at present, process 1 (A device) is stopped due to dimensional error, process 2 (B device) is stopped due to transfer position error, and process 6 (F device and F1 device) ) indicates that the pressure value has decreased. Also, in process 1, it is indicated that the part lot was changed between 11:30 and 11:40.

The user can confirm which device in the production line 30 is currently malfunctioning from the display in the current status display area 201 of the operating status display screen 200 . Also, by displaying the time-series display area 204 of the operating state display screen 200, it is possible to confirm changes in the time-series of the sensor information for each process.

Note that the time-series display area 204 may display changes in time-series of sensor information for each device instead of for each process of the production line 30 .

Furthermore, by performing a pressing operation (clicking operation, etc.) on an icon corresponding to each device displayed in the current display area 201, the user can display time-series alerts generated in the device corresponding to the pressed icon. An alert list screen 210 (FIG. 7) showing a list of . The alert list screen 210 is popped up on the operating status display screen 200, for example.

FIG. 7 shows a display example of the alert list screen 210. As shown in FIG. An alert list screen 210 shown in the figure is displayed when an icon corresponding to the A device is clicked in the current status display area 201 of the operation status display screen 200 .

The alert list screen 210 is provided with an alert list display area 211 , a countermeasure search button 212 and a cancel button 213 . In the alert list display area 211, the date and time of occurrence of each alert, the content of the alert, the confirmation status, and the report status are displayed in chronological order.

The user selects one or a plurality of alerts from among the alerts displayed in the alert list display area 211 by a click operation or the like, and presses (clicks or the like) a countermeasure search button 212 . In response to this, the search unit 115 refers to the change point contents of the recovery method master DB 125 to search for an event that is the same as or similar to the content of the alert selected by the user, and the alarm confirmation method recorded corresponding to it. And the recovery method is read out and output to the display control unit 116 . The display control unit 116 refers to the alarm confirmation method and recovery method input from the search unit 115 to generate a search result display screen 220 (FIG. 8).

Note that the alert list screen 210 shown in FIG. 7 shows a state in which the user has selected an alert notifying that the device A will stop due to defective processed product data that occurred at 12:54. The search result of the coping method is displayed as a search result display screen 220 (FIG. 8) as a pop-up on the alert list screen 210, for example.

FIG. 8 shows a display example of the search result display screen 220. As shown in FIG. The search result display screen 220 is provided with an alarm confirmation method display area 221 that displays an alarm confirmation method, a recovery method display area 222 that displays a recovery method, a return button 223 and a close button 224 .

The user can confirm the alarm confirmation method and the restoration method by displaying the search result display screen 220, and can promptly deal with the problem.

It should be noted that the retrieval result display screen 220 may display the cause of stopping the apparatus in addition to the alarm confirmation method and recovery method.

Next, FIG. 9 is a flowchart illustrating another example of operation monitoring processing by the operation monitoring device 10. As shown in FIG.

The operation monitoring process is obtained by adding step S6 to the operation monitoring process (steps S1 to S5) shown in FIG. 5, and steps S1 to S5 are the same as the operation monitoring process of FIG. Therefore, description thereof will be omitted as appropriate.

In step S5, after the display control unit 116 refers to the equipment operation DB 122 and updates the operating state display screen 200 according to the content of the extracted change point, the operating state prediction unit 113 Based on the content of the change point, the future operating state of the production line 30 is predicted. Specifically, the operating state prediction unit 113 refers to the change point conditions in the prediction master DB 123, searches for an event that matches or is similar to the content of the extracted change point, and records the corresponding event. The prediction result is read out and output to the display control unit 116 . Then, the display control unit 116 updates the operating state display screen 200 based on the prediction result (step S6). After that, the process returns to step S1, and steps S1 to S6 are repeated until the operation of the production line 30 is completed.

FIG. 10 shows a display example of the operating status display screen 200 updated based on the prediction result of the future operating status. The display example in the figure shows a case where the stop of the F1 device performing the work of process 6 is predicted in the future.

In the current state display area 201 of the operating state display screen 200, an alert mark 202 indicating that the stop of the device is predicted is additionally displayed to the right of the alert mark 203 superimposed on the icon corresponding to the F1 device. be. Further, in the time-series display area 204, a prediction that the F1 apparatus will stop due to a dimensional abnormality is displayed on the right side of the dashed line representing the current time of step 6. FIG.

According to another example of the operation monitoring process described above, the user can grasp in advance changes in the operating state that may occur in the production line 30 in the future. Therefore, the user can prepare in advance for the stoppage of the production line 30 that is predicted to occur in the future.

The present invention is not limited to the embodiments described above, and various modifications are possible. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment can be replaced with or added to the configuration of another embodiment.

Further, each of the above configurations, functions, processing units, processing means, and the like may be realized by hardware, for example, by designing a part or all of them using an integrated circuit. Moreover, each of the above configurations, functions, etc. may be realized by software by a processor interpreting and executing a program for realizing each function. Information such as programs, tables, and files that implement each function can be stored in a recording device such as a memory, a hard disk, or an SSD, or a recording medium such as an IC card, an SD card, or a DVD. Further, the control lines and information lines indicate those considered necessary for explanation, and not all control lines and information lines are necessarily indicated on the product. In practice, it may be considered that almost all configurations are interconnected.

DESCRIPTION OF SYMBOLS 10... Operation monitoring apparatus 11... Processing part 111... Information acquisition part 112... Change point extraction part 113... Operation state prediction part 114... Master editing part 115 ... search unit, 116 ... display control unit, 12 ... storage unit, 121 ... sensor performance DB, 122 ... facility operation DB, 123 ... prediction master DB, 124 ... process Master DB 125 Recovery method master DB 13 Input unit 14 Output unit 15 Communication unit 20 Network 30 Production line 31 Equipment 32... Sensor 40... Information terminal 200... Operating state display screen 201... Current status display area 202... Alert mark 203... Alert mark 204... Time-series display area 210 Alert list screen 211 Alert list display area 212 Solution search button 213 Cancel button 220 Search result display screen 221 Alarm confirmation method display area 222 Recovery method display area 223 Back button 224 Close button

Claims (7)

an information acquisition unit that acquires sensor information representing the state of the device arranged on the production line;
a sensor performance database that stores the acquired sensor information in association with time;
a change point extraction unit that refers to the sensor performance database and extracts a change point of the sensor information;
a recovery method master database in which, for each of the devices, at least contents of change points of sensor information that occurred immediately before the device stopped when the device stopped in the past, and recovery methods are recorded in association with each other;
a search unit that refers to the recovery method master database using as a search condition a change point in sensor information that occurred in the stopped device immediately before the stop, and searches for a corresponding recovery method;
a display control unit for displaying a search result display screen showing the retrieved restoration method;
with
The change point extraction unit extracts, as the change points of the sensor information, the timing at which the device stops, the timing at which the lot of the member to be processed by the device is replaced, the temperature, pressure, sound, and vibration of the device. at least one of the start timing and the end timing of the period in which at least one of the above exceeds a predetermined reference value, and at least one of the temperature, pressure, sound, and vibration of the device changed from an increase to a decrease Extracting at least one of the timing and the timing at which at least one of temperature, pressure, sound, and vibration of the device changes from decrease to increase;
Based on the sensor information and the change point of the extracted sensor information, the display control unit controls a current display area representing a current operating state of the production line and a change in the sensor information of the production line up to the present. An operation monitoring device, characterized by displaying an operation status display screen including a time period in which the change occurs and a time-series display area for displaying details of the change in time-series. The operation monitoring device according to claim 1,
The search unit refers to the recovery method master database using, as a search condition, one selected by the user from among the change points in the sensor information that occurred in the stopped device immediately before the stop, and searches for the corresponding recovery method. An operation monitoring device characterized by: The operation monitoring device according to claim 1,
The display control unit displays, for each process of the production line, a period during which the sensor information has changed up to the present and details of the change in chronological order, based on the extracted change points of the sensor information. An operation monitoring device characterized by displaying the operation state display screen including the time-series display area. The operation monitoring device according to claim 1,
a prediction master database in which contents of change points of the sensor information and contents of changes in operating conditions that may occur in the future are associated and recorded for each of the devices;
an operating state prediction unit that, when the change point is extracted from the sensor information, refers to the prediction master database and predicts a change in the operating state that may occur in the future in the production line;
The operation monitoring device, wherein the display control unit displays the prediction result predicted by the operation state prediction unit in the time-series display area of the operation state display screen. An operation monitoring method by an operation monitoring device,
an information acquisition step of acquiring sensor information representing the state of the device arranged on the production line;
a recording step of correlating the acquired sensor information with time and recording it in a sensor performance database;
a change point extraction step of referring to the sensor performance database and extracting a change point of the sensor information;
Based on the sensor information and the change point of the extracted sensor information, a current status display area representing the current operating status of the production line, a period during which the sensor information of the production line has changed up to the present, and a first display control step of displaying an operating state display screen including a time-series display area showing the content of the change in time-series; , reference is made to a recovery method master database in which, for each device, at least the details of the point of change in sensor information that occurred immediately before the device stopped when the device stopped in the past, and the recovery method are recorded in association with each other. a search step of searching for a corresponding recovery method;
a second display control step of displaying a search result display screen showing the retrieved restoration method;
including
In the change point extraction step, as the change points of the sensor information, the timing at which the device is stopped, the timing at which the lot of the member to be processed by the device is changed, the temperature, pressure, sound, and vibration of the device. at least one of the start timing and the end timing of the period in which at least one of the above exceeds a predetermined reference value, and at least one of the temperature, pressure, sound, and vibration of the device changed from an increase to a decrease Extracting at least one of timing and timing at which at least one of temperature, pressure, sound, and vibration of the device changes from decrease to increase
An operation monitoring method characterized by: an information acquisition unit that acquires sensor information representing the state of the device arranged on the production line;
a sensor performance database that stores the acquired sensor information in association with time;
a change point extraction unit that refers to the sensor performance database and extracts a change point of the sensor information;
Based on the sensor information and the change point of the extracted sensor information, a current status display area representing the current operating status of the production line, a period during which the sensor information of the production line has changed up to the present, and a display control unit for displaying an operating state display screen including a time-series display area showing the content of the change in time-series;
with
The change point extraction unit extracts, as the change points of the sensor information, the timing at which the device stops, the timing at which the lot of the member to be processed by the device is replaced, the temperature, pressure, sound, and vibration of the device. at least one of the start timing and the end timing of the period in which at least one of the above exceeds a predetermined reference value, and at least one of the temperature, pressure, sound, and vibration of the device changed from an increase to a decrease Extracting at least one of timing and timing at which at least one of temperature, pressure, sound, and vibration of the device changes from decrease to increase
An operation monitoring device characterized by: An operation monitoring method by an operation monitoring device,
an information acquisition step of acquiring sensor information representing the state of the device arranged on the production line;
a recording step of correlating the detected sensor information with time and recording it in a sensor performance database;
a change point extraction step of referring to the sensor performance database and extracting a change point of the sensor information;
Based on the sensor information and the change point of the extracted sensor information, a current status display area representing the current operating status of the production line, a period during which the sensor information of the production line has changed up to the present, and a display control step of displaying an operating state display screen including a time-series display area showing the content of the change in time-series;
including
In the change point extraction step, as the change points of the sensor information, the timing at which the device is stopped, the timing at which the lot of the member to be processed by the device is changed, the temperature, pressure, sound, and vibration of the device. at least one of the start timing and the end timing of the period in which at least one of the above exceeds a predetermined reference value, and at least one of the temperature, pressure, sound, and vibration of the device changed from an increase to a decrease Extracting at least one of timing and timing at which at least one of temperature, pressure, sound, and vibration of the device changes from decrease to increase
An operation monitoring method characterized by:

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