JP5545183B2 - Physical distribution equipment and abnormality detection method - Google Patents

Description

  The present invention relates to a physical distribution equipment that carries goods and the like, and more particularly to abnormality detection of a physical distribution equipment.

  Conventionally, physical distribution equipment has been used to efficiently transport a large number of packages on a site such as a factory or a warehouse. Examples of such physical distribution equipment include a stacker crane, a tracked carriage, and an overhead traveling vehicle.

  In addition, such physical distribution equipment is required to move and deliver the cargo with high accuracy and efficiency. Therefore, in recent years, transportation systems including physical distribution equipment have become complicated and large-scale, and there are cases where troubles such as cart troubles occur.

  Therefore, a technique regarding a monitoring system for monitoring a defect occurring in the transport system is also disclosed (see, for example, Patent Document 1).

  In the monitoring system described in Patent Document 1, a main controller receives a signal indicating each current position and the like from each carriage. The controller stores data on the occurrence status of defects determined from the received signal. Furthermore, according to the stored data, the cart related to the failure is displayed on the monitor along with the operation before and after the occurrence of the failure on the layout of the area where the failure occurred on the travel route.

  Thereby, for example, the administrator who manages the conveyance system can easily make the occurrence point of the defect visible.

JP 2010-152606 A

  Here, as described above, in order to realize highly accurate and efficient movement and delivery of luggage, some care should be taken to prevent the occurrence of even a slight abnormality that occurs in the physical distribution equipment. It is necessary to apply.

  For that purpose, when any abnormality occurs in the physical distribution equipment, it is important to investigate the cause of the abnormality.

  However, since a precise operation is required for the physical distribution equipment, both hardware and software constituting the physical distribution equipment are complicated. As a result, it has become difficult to investigate the causes of individual abnormalities that occur in physical distribution equipment.

  Here, for example, it is also conceivable to provide a measuring instrument for identifying the cause of the abnormality at each location of the physical distribution equipment. However, in this case, in order to guarantee the effective force against various abnormalities, it is necessary to install many measuring instruments for identifying the cause of the abnormalities in the physical distribution equipment, which is not realistic.

  An object of the present invention is to provide a physical distribution device and an abnormality detection method capable of efficiently investigating the causes of various abnormalities occurring in the physical distribution device in consideration of the above-described conventional problems.

  In order to solve the above-described conventional problems, a logistics transport device according to an aspect of the present invention is a logistics transport device that transports a package, and includes a control unit that controls the operation of the logistics transport device, A sensor for detecting an operation state, a storage unit for storing information, information indicating a state of an input signal input from the sensor to the control unit, and a state of an output signal output from the control unit An acquisition unit that acquires signal state information that is at least one of the information indicating, and stores the acquired signal state information in the storage unit as history information, and a signal group indicated by the signal state information acquired by the acquisition unit An abnormal signal specifying unit for specifying an abnormal signal group indicating an abnormality of the physical distribution equipment from a certain target signal group, a first signal group temporally prior to the abnormal signal group in the target signal group, and the storage A comparison unit that compares the second signal group temporally prior to the same signal group as the abnormal signal group among the signal groups indicated in the history information stored in the history information, and a result of the comparison by the comparison unit And a common signal specifying unit for specifying a signal common between the first signal group and the second signal group, and an output unit for outputting information indicating the signal specified by the common signal specifying unit. .

  According to this configuration, when any abnormality occurs in the physical distribution equipment of this aspect, the first signal group before the occurrence of the abnormality and the second signal group before the occurrence of the same type of abnormality that occurred in the past are To be compared. Furthermore, this comparison identifies one or more signals that are common between the first signal group and the second signal group.

  That is, a signal that is considered to be deeply involved in the abnormality is identified from among a large number of signals emitted from the sensor or control unit before the occurrence of the abnormality, and information indicating the identified signal is output. The

  Therefore, the cause of the abnormality can be efficiently investigated by using the output information.

  Further, according to the physical distribution device of this aspect, the signal that is highly likely to be involved in the abnormality is specified based on the signals emitted from the components originally provided in the physical distribution device, such as the control unit and the sensor. Can do. That is, there is no need to provide a separate measuring instrument for identifying the cause of the abnormality.

  Thus, according to the physical distribution equipment of this mode, it is possible to efficiently investigate the causes of various abnormalities that occur in the physical distribution equipment.

  In the physical distribution equipment according to one aspect of the present invention, the acquisition unit includes information indicating a state of the input signal for each predetermined period and information indicating a state of the output signal for the predetermined period. The signal state information that is at least one may be acquired.

  According to this configuration, the state of the input signal or output signal for each predetermined period can be acquired. Therefore, for example, by shortening the predetermined period, the accuracy of investigating the cause of the abnormality can be improved.

  Moreover, in the physical distribution equipment according to one aspect of the present invention, the acquisition unit includes information indicating a state of the input signal at each timing when the input signal changes, and the output at each timing when the output signal changes. The signal state information that is at least one of information indicating the signal state may be acquired.

  According to this configuration, it is possible to acquire the state of the input signal or output signal at every timing when the state of the input signal or output signal changes. Therefore, for example, the required capacity for storing history information can be reduced.

  In the physical distribution device according to one aspect of the present invention, the storage unit includes a first storage unit and a second storage unit having a larger capacity than the first storage unit, and the acquisition unit includes ( a) Update the signal state information stored in the first storage unit as needed by writing the acquired signal state information to the first storage unit as needed, and (b) the target signal by the abnormal signal specifying unit When the abnormal signal group is specified from the group, the signal state information indicating the target signal group stored in the first storage unit may be written in the second storage unit as history information.

  According to this configuration, only when an abnormality occurs, signal state information indicating the state of the input signal or output signal for a predetermined period retroactive from the abnormality is accumulated as history information in the second storage unit. .

  That is, only the minimum information necessary for investigating the cause of the abnormality can be stored in the second storage unit. As a result, for example, the capacity of the second storage unit can be minimized and the efficiency of the comparison process can be improved.

  An abnormality detection method according to an aspect of the present invention is an abnormality detection method for detecting an abnormality of a physical distribution device that transports a load, and the physical distribution device controls an operation of the physical distribution device. A controller that detects a state of operation of the physical distribution equipment, and the abnormality detection method includes information indicating a state of an input signal input from the sensor to the controller, and the controller An acquisition step of acquiring signal state information which is at least one of information indicating the state of the output signal output from the storage unit, and storing the acquired signal state information in the storage unit as history information, and the signal state acquired in the acquisition step An abnormal signal specifying step of specifying an abnormal signal group indicating an abnormality of the physical distribution equipment from the target signal group which is a signal group indicated in the information; and A first signal group temporally prior to the signal group and a second signal temporally prior to the same signal group as the abnormal signal group among the signal groups indicated in the history information stored in the storage unit A comparison step for comparing with a group, a common signal specifying step for specifying a common signal between the first signal group and the second signal group from a comparison result in the comparison step, and the common signal specification An output step of outputting information indicating the signal specified in the step.

  According to this method, for example, an abnormality can be detected for each of a plurality of physical distribution equipment, and the cause of the abnormality can be investigated efficiently.

  Further, the present invention can be realized not only as the above-described abnormality detection method but also as an abnormality detection method including a characteristic process executed by the physical distribution equipment according to any one of the above aspects. Further, the present invention can be realized as a program for causing a computer to execute each process included in the abnormality detection method according to any aspect, and as a recording medium on which the program is recorded. The program can be distributed via a transmission medium such as the Internet or a recording medium such as a DVD.

  According to the present invention, it is possible to provide a physical distribution device and an abnormality detection method that can efficiently investigate the causes of various abnormalities occurring in the physical distribution device.

It is a figure which shows the external appearance of an automatic warehouse provided with the stacker crane in embodiment of this invention. It is a block diagram which shows the main structures of the stacker crane of embodiment. It is a figure for demonstrating the memory | storage process of the signal state information in embodiment. It is a figure for demonstrating the specific process of the abnormal signal group in the embodiment, and the specific process of a common signal. It is a figure which shows an example of the data format of the signal status information in an embodiment, and history information. It is a figure which shows the data structural example of the signal state information which shows the state of the input signal or output signal for every timing when the input signal or the output signal changed, and history information. It is a figure which shows an example of the data format of the common signal information of embodiment. It is a block diagram which shows the main structures of the abnormality detection apparatus separate from a stacker crane.

  A stacker crane according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an external appearance of an automatic warehouse provided with a stacker crane in an embodiment of the present invention.

  An automatic warehouse 10 shown in FIG. 1 is a warehouse in which a load 60 is automatically stored in a rack 50 and a stored load 60 is automatically carried out by a stacker crane 12 which is an example of a physical distribution transport device of the present invention. is there.

  The automatic warehouse 10 includes a stacker crane 12, a traveling rail 16 for moving the stacker crane 12, a rack 50 provided along a path of the stacker crane 12, and a station 51 on which articles are placed at the time of loading and unloading. ing.

  The stacker crane 12 can move on the traveling rail 16, raise and lower the lifting platform 15, and move the slide fork 15 a back and forth. Thereby, the luggage 60 can be moved between the station 51 and the rack 50 and between the plurality of shelves of the rack 50.

  Further, the stacker crane 12 has an abnormality detection device 20 that detects the occurrence of an abnormality in the stacker crane 12.

  FIG. 2 is a block diagram illustrating a main configuration of the stacker crane 12 according to the embodiment.

  As shown in FIG. 2, the stacker crane 12 includes a control unit 13, a mechanism unit 14, a sensor 18, and an abnormality detection device 20 as main components.

  The control unit 13 controls the operation of the stacker crane 12. Specifically, the control unit 13 controls the operation of the stacker crane 12 by giving various instructions to the mechanism unit 14.

  The mechanism unit 14 includes a lift 15 and a slide fork 15a shown in FIG. 1 and a motor (not shown) for driving the stacker crane 12 and operates according to instructions from the control unit 13 and the like.

  The sensor 18 detects the state of operation of the stacker crane 12. The stacker crane 12 is provided with various sensors for detecting the operation state of the stacker crane 12, such as the position and traveling speed of the stacker crane 12, the vertical position of the lift 15 and the sliding fork 15a. Have.

  However, in order to clarify the description of the embodiment, one sensor 18 is shown as a representative of the plurality of sensors, and the description will be given.

  The abnormality detection device 20 is a device that detects an abnormality occurring in the stacker crane 12 and can output information indicating the cause of the abnormality. The abnormality detection device 20 includes an acquisition unit 21, a storage unit 22, an abnormal signal identification unit 25, a comparison unit 26, a common signal identification unit 27, and an output unit 28.

  The acquisition unit 21 acquires signal state information that is at least one of information indicating the state of the input signal input from the sensor 18 to the control unit 13 and information indicating the state of the output signal output from the control unit 13. . The acquisition unit 21 further stores the acquired signal state information in the storage unit 22 as history information.

  The abnormal signal specifying unit 25 specifies an abnormal signal group that indicates an abnormality of the stacker crane 12 from the target signal group that is a signal group indicated by the signal state information acquired by the acquiring unit 21.

  Here, the abnormal signal group is a signal group that appears as a sign of abnormality, and is different for each type of abnormality. The types of abnormalities include deviation of the stop position of the stacker crane 12 from the target position, deviation of the traveling speed from the target speed, and abnormal operation of the slide fork 15a (the slide fork 15a does not extend to a normal position, etc. And the like.

  The abnormal signal specifying unit 25 has, for example, abnormal signal group information indicating an abnormal signal group corresponding to each of a plurality of types of abnormalities. The abnormal signal specifying unit 25 can specify the abnormal signal group included in the target signal group by comparing the abnormal signal group information and the target signal group.

  The storage unit 22 is a device for storing information. In the present embodiment, the storage unit 22 includes a first storage unit 23 and a second storage unit 24 having a larger capacity than the first storage unit 23. The roles of the first storage unit 23 and the second storage unit 24 will be described later with reference to FIG.

  The comparison unit 26 is the same signal group as the abnormal signal group of the first signal group temporally prior to the abnormal signal group in the target signal group and the signal group indicated in the history information stored in the storage unit 22. Compare with the second signal group before the time.

  The common signal specifying unit 27 specifies a signal that is common between the first signal group and the second signal group based on the result of the comparison by the comparison unit 26. The output unit 28 outputs information indicating the signal specified by the common signal specifying unit 27.

  The flow of processing related to abnormality detection in the stacker crane 12 of the embodiment configured as described above will be described with reference to FIGS.

  FIG. 3 is a diagram for explaining signal state information storage processing according to the embodiment.

  As illustrated in FIG. 3, the acquisition unit 21 records signal state information in the first storage unit 23 included in the storage unit 22. Specifically, the acquisition unit 21 updates the signal state information stored in the first storage unit 23 as needed by writing the acquired signal state information to the first storage unit 23 as needed.

  In addition, when the abnormal signal group is specified from the target signal group by the abnormal signal specifying unit 25, the acquiring unit 21 stores the signal state information indicating the target signal group stored in the first storage unit 23. Write to the second storage unit 24 as history information.

  That is, every time an abnormality occurs in the stacker crane 12, a log corresponding to the abnormality is accumulated in the second storage unit 24.

  In FIG. 3, with the occurrence of an abnormality in the stacker crane 12, the signal state information stored in the first storage unit 23 is accumulated in the second storage unit 24 as log [n] which is history information. It shows a state.

  As the first storage unit 23, for example, a ring buffer is employed. Further, as the second storage unit 24, for example, an HDD (Hard Disk Drive) is employed.

  Further, in the stacker crane 12 of the embodiment, when an abnormality occurs in this way, a log that matches an abnormality signal group corresponding to the abnormality is specified from the second storage unit 24.

  FIG. 4 is a diagram for explaining an abnormal signal group specifying process and a common signal specifying process in the embodiment.

  The upper diagram of FIG. 4 is a conceptual diagram showing the contents of signal state information in the embodiment, and the middle diagram is a conceptual diagram showing the contents of history information to be compared with the signal state information. 4 is a conceptual diagram showing the contents of common signal information output from the output unit 28.

  Each of the signals 1 to 6 on the vertical axis in FIG. 4 is one of various input signals input from the sensor 18 to the control unit 13 or various output signals output from the control unit 13. Represents either.

  Here, the types of signals included in the signal state information and history information are six types of signals 1 to 6 in FIG. However, the number of types of signals included in these pieces of information is not particularly limited as long as one or more types of signals are included.

  Also, the horizontal axis in FIG. 4 is a time axis. For example, the acquisition unit 21 acquires information indicating the state of the input signal or output signal for each predetermined period such as every 5 msec.

  In addition, a rectangular portion with hatching or dots in FIG. 4 indicates that the signal is “ON”, and a blank rectangular portion indicates that the signal is “OFF”.

  For example, when the sensor 18 that detects the position of the stacker crane 12 detects that the stacker crane 12 is located at a predetermined position (such as the origin or the front position of the shelf where the rack 50 is located), the control unit sends an “ON” signal. 13 is input.

  Further, when the stacker crane 12 moves from the position, the signal of the sensor 18 is “OFF”.

  In addition, for example, the sensor 18 that detects whether or not a load is placed on the lifting platform 15 sends an “ON” signal to the control unit during a period when it is detected that a load is placed on the lifting platform 15. 13 is input.

  Further, the sensor 18 stops the input of the “ON” signal to the control unit 13 during a period in which it is not detected that the load is placed from the lifting platform 15. That is, the signal is maintained in the “OFF” state.

  For example, when the traveling speed of the stacker crane 12 does not reach a predetermined target speed, the control unit 13 outputs an “ON” signal for accelerating the motor that drives the traveling.

  The acquisition unit 21 is signal state information indicating the state of at least one of the signals emitted from the various sensors 18 and the signals emitted from the control unit 13 as described above (for example, ON and OFF of signals from each sensor). (Information in which OFF is arranged in time series).

  The abnormal signal specifying unit 25 confirms whether or not the target signal group indicated by the signal state information acquired in this way includes, for example, the abnormal signal group indicated by the abnormal signal group information that the own signal has. .

  For example, the target signal group shown in the signal state information in FIG. 4 includes an abnormal signal group x corresponding to an abnormality [X] (for example, an abnormality that the slide fork 15a does not extend to a predetermined position).

  Therefore, the abnormal signal specifying unit 25 specifies the abnormal signal group x from the target signal group. Thereby, the occurrence of the abnormality [X] in the stacker crane 12 is detected.

  In this case, the comparison unit 26 includes the first signal group temporally preceding the abnormal signal group x in the target signal group and the signal group indicated in the history information stored in the second storage unit 24. Comparison with the second signal group temporally preceding the abnormal signal group x is performed.

  Specifically, the comparison unit 26 first specifies a log including the abnormal signal group x from a plurality of logs stored in the second storage unit 24. Thereby, for example, the log [m] is specified.

  Next, the comparison unit 26 compares the first signal group with the second signal group temporally preceding the abnormal signal group x in the specified log [m].

  The common signal specifying unit 27 specifies a common signal, which is a signal common to the first signal group and the second signal group, from the result of the comparison by the comparison unit 26.

  In the case of the example shown in FIG. 4, it can be seen that a rectangular portion indicated by diagonal lines represents a common signal, and a plurality of common signals are specified.

  The output unit 28 outputs common signal information that is information indicating the common signal specified by the common signal specifying unit 27.

  Thus, in the stacker crane 12 of the embodiment, when a certain abnormality occurs, the first signal group before the occurrence of the abnormality and the second signal group before the occurrence of the same type of abnormality that occurred in the past are: To be compared. Furthermore, this comparison identifies one or more signals that are common between the first signal group and the second signal group.

  That is, a signal that is considered to be deeply involved in the abnormality is identified from among a large number of signals emitted from the various sensors 18 or the control unit 13 before the occurrence of the abnormality, and indicates the identified signal. Information is output.

  The output destination of the information is, for example, a display device (not shown), and the display device displays information indicating one or more signals that are considered to be deeply involved in the abnormality.

  Thereby, for example, the manager of the stacker crane 12 can efficiently investigate the cause of the abnormality.

  The information indicating the signal specified by the common signal specifying unit 27 output from the output unit 28 is, for example, a database in which a signal group that is a sign of various abnormalities and the cause of the abnormalities are associated with each other. It may be entered. In this case, the cause of the abnormality occurring in the stacker crane 12 can be automatically determined.

  Furthermore, in the stacker crane 12 of the embodiment, a signal that is highly likely to be involved in an abnormality is generated based on signals that are emitted from the components that are originally provided as the physical distribution equipment such as the control unit 13 and the sensor 18. Can be identified. That is, there is no need to provide a separate measuring instrument for identifying the cause of the abnormality.

  Here, in FIG. 4, the signal state information and the history information are illustrated as a schematic diagram showing their contents, but the actual data format of the signal state information and the history information is not limited to a specific one.

  FIG. 5 is a diagram illustrating an example of a data format of signal state information and history information in the embodiment.

  As illustrated in FIG. 5, the signal state information and history information (log) may be generated and stored in, for example, CSV (Comma Separated Values) format.

  Note that the signal state information (history information) illustrated in FIG. 5 is information indicating the state of the input signal or the output signal acquired by the acquisition unit 21 every predetermined period, similarly to the signal state information illustrated in FIG.

  For example, it can be seen that the signal 1 is “ON” in the fifth section from the left and is switched from the sixth section from the left to “OFF”.

  Further, the acquisition unit 21 changes the state of each signal at the timing when, for example, any signal is switched from “ON” to “OFF” or “OFF” to “ON” instead of every predetermined period. You may get it.

  FIG. 6 is a diagram illustrating a data configuration example of signal state information and history information indicating the state of the input signal or output signal at each timing when the input signal or the output signal changes.

  Specifically, the signal state information (history information) shown in FIG. 6 corresponds to the state of each signal at the timing when one of the signals 1 to 4 changes in the signal state information (history information) shown in FIG. ing.

  Thus, by acquiring the signal state information indicating the state of each signal for each timing at which any of the plurality of signals to be acquired has changed, for example, the signal state information in the second storage unit 24 is used as history information. The required capacity for storing can be reduced.

  In the signal state information (history information) shown in FIG. 6, time information indicating the timing may be added for each timing (that is, for each vertical column in FIG. 6).

  In this case, the signal state information (history information) shown in FIG. 6 can be converted into the signal state information (history information) shown in FIG. 5 using the added time information.

  Further, the common signal information output from the output unit 28 is not limited to a specific data format.

  FIG. 7 is a diagram illustrating an example of a data format of common signal information according to the embodiment.

  As illustrated in FIG. 7, the common signal information may be generated as, for example, CSV format data.

  The common signal information shown in FIG. 7 represents the common signal information shown in FIG. 4 as data in CSV format, that is, signal state information (history information) indicating a signal state for each predetermined period. The common signal calculated | required based on this is shown.

  However, the common signal information may also be generated so as to indicate the state of each signal for each change timing of the plurality of signals, similarly to the signal state information (history information) illustrated in FIG. In other words, in FIG. 7, only the column in which any of the signals 1 to 4 is “ON” may be left and the other portions may be deleted.

  Even in such a case, when a certain abnormality occurs, it can be easily confirmed which signal is turned “ON” in any order immediately before that, so the cause of the abnormality can be investigated efficiently. Can be executed.

  Further, in the present embodiment, the stacker crane 12 that is the target of abnormality detection includes the abnormality detection device 20. However, a device that is separate from the stacker crane 12 and can communicate with the stacker crane 12 may have the same function as the abnormality detection device 20.

  FIG. 8 is a block diagram showing a main configuration of an abnormality detection device separate from the stacker crane 12.

  The abnormality detection device 30 shown in FIG. 8 has the same functional configuration as the abnormality detection device 20 shown in FIG. However, the abnormality detection device 30 is realized by a CPU, a memory, an HDD, a program, and the like included in the personal computer.

  Thus, by making the stacker crane 12 that is the target of abnormality detection and the abnormality detection device 30 separate from each other, the abnormality detection device 30 can detect an abnormality for each of a plurality of physical distribution equipment, for example. The cause of the abnormality can be investigated efficiently.

  Heretofore, the physical distribution equipment and the abnormality detection device of the present invention have been described based on the embodiments. However, the present invention is not limited to the above embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in the present embodiment, or forms constructed by combining a plurality of the above-described constituent elements are within the scope of the present invention. include.

  For example, in the description of FIG. 4, it is assumed that one signal state information is compared with one log (log [m]) in order to specify a common signal. However, when specifying a common signal, one signal state information may be compared with a plurality of logs.

  For example, when the abnormal signal group x is specified by the abnormal signal specifying unit 25, the comparing unit 26 specifies a plurality of logs including the abnormal signal group x, the second signal group in each of the plurality of logs, 4 is compared with the first signal group shown in the upper diagram.

  For example, when the comparison unit 26 compares the second signal group in each of the three logs and the first signal group, the common signal specifying unit 27 has one or more signals that are common to all four signal groups. Are identified as common signals.

  Thus, by specifying a common signal using a plurality of logs, the reliability of the identified common signal (in this example, the strength of the relationship between the common signal and the abnormality [X]) is improved. Can do.

  Further, for example, a signal common to all four signal groups may be specified as the first common signal, and a signal common to three signal groups of the four signal groups may be specified as the second common signal. Good. In this case, common signal information may be generated and output in such a manner that the identified first common signal and second common signal can be distinguished.

  In this way, by identifying a common signal for each category corresponding to the high degree of commonality among the three or more signal groups to be compared and outputting information indicating these, for example, the accuracy of the investigation process of the cause of the abnormality Can be improved.

  Further, in this embodiment, each time an abnormality is detected, a log including an abnormal signal group corresponding to the abnormality and a signal group (first signal group in FIG. 4) for a predetermined period immediately before the abnormal signal group is used as history information. It is stored in the second storage unit 24.

  However, for example, the signal state information acquired by the acquisition unit 21 may be continuously accumulated in the second storage unit 24 regardless of whether or not abnormality is detected. Even in this case, a history of signal states that are considered to be involved in an abnormality occurring in the stacker crane 12 can be left in the second storage unit 24.

  That is, the first storage unit 23 that temporarily stores the signal state information may be omitted. In this case, for example, the accumulated information is deleted from the second storage unit 24 before the second storage unit 24 runs out of free space, and thereafter, accumulation of signal state information in the second storage unit 24 is started. What is necessary is just to repeat a series of processes of doing.

  The physical distribution equipment and the abnormality detection method of the present invention are physical distribution equipment and an abnormality detection method that can efficiently investigate the causes of various abnormalities that occur in the physical distribution equipment. Therefore, the present invention is useful as a distribution transport device that transports luggage in factories and distribution warehouses, and an abnormality detection method for the distribution transport device.

DESCRIPTION OF SYMBOLS 10 Automatic warehouse 12 Stacker crane 13 Control part 14 Mechanism part 15 Lifting stand 15a Slide fork 16 Traveling rail 18 Sensor 20, 30 Abnormality detection apparatus 21 Acquisition part 22 Storage part 23 First storage part 24 Second storage part 25 Abnormal signal specific part 26 Comparison Unit 27 Common Signal Identification Unit 28 Output Unit 50 Rack 51 Station 60 Luggage

Claims (5)

A logistics transport device for transporting luggage,
A control unit for controlling the operation of the physical distribution equipment;
A sensor for detecting an operation state of the physical distribution equipment;
A storage unit for storing information , the storage unit having a first storage unit and a second storage unit having a larger capacity than the first storage unit ;
Signal state information obtained by acquiring signal state information that is at least one of information indicating the state of an input signal input from the sensor to the control unit and information indicating a state of an output signal output from the control unit. An acquisition unit that temporarily stores information in the first storage unit, and stores the signal state information in the second storage unit as history information;
It has abnormal signal group information indicating an abnormal signal group corresponding to each of a plurality of types of abnormalities, the abnormal signal group information, and the signal state information acquired in the acquisition unit and stored in the first storage unit An abnormal signal specifying unit for specifying an abnormal signal group indicating an abnormality of the physical distribution equipment from the target signal group by comparing the target signal group which is a signal group shown;
A first signal group temporally prior to the abnormal signal group in the target signal group and stored in the first storage unit, and history information stored in the second storage unit A comparison unit that compares the second signal group temporally prior to the same signal group as the abnormal signal group of the signal group shown in
From the result of the comparison by the comparison unit, a common signal specifying unit for specifying a signal common between the first signal group and the second signal group;
A logistics transport device comprising: an output unit that outputs information indicating a signal specified by the common signal specifying unit. 2. The acquisition unit acquires the signal state information that is at least one of information indicating a state of the input signal for each predetermined period and information indicating a state of the output signal for each predetermined period. The physical distribution equipment described. The acquisition unit is at least one of information indicating the state of the input signal at each timing when the input signal changes and information indicating the state of the output signal at each timing when the output signal changes The physical distribution equipment according to claim 1 which acquires information. The acquisition unit updates the signal state information stored in the first storage unit as needed by (a) writing the acquired signal state information to the first storage unit as needed, and (b) specifying the abnormal signal When the abnormal signal group is specified from the target signal group by the unit, the signal state information indicating the target signal group stored in the first storage unit is written in the second storage unit as history information. The physical distribution equipment according to any one of claims 1 to 3. An anomaly detection method for detecting an anomaly in a logistics transport device that transports luggage,
The physical distribution equipment has a control unit that controls the operation of the physical distribution equipment, and a sensor that detects the state of operation of the physical distribution equipment,
The abnormality detection method is:
Signal state information obtained by acquiring signal state information that is at least one of information indicating the state of an input signal input from the sensor to the control unit and information indicating a state of an output signal output from the control unit. An acquisition step of temporarily storing information in the first storage unit and storing the signal state information in the second storage unit as history information;
Target signal group which is a signal group indicated in the abnormal signal group information indicating the abnormal signal group corresponding to each of a plurality of types of abnormalities and the signal state information acquired in the acquisition step and stored in the first storage unit And an abnormal signal specifying step for specifying an abnormal signal group indicating an abnormality of the physical distribution equipment from the target signal group ,
A first signal group temporally prior to the abnormal signal group in the target signal group and stored in the first storage unit, and history information stored in the second storage unit A comparison step of comparing the second signal group temporally prior to the same signal group as the abnormal signal group of the signal group shown in
From the result of the comparison in the comparison step, a common signal specifying step for specifying a common signal between the first signal group and the second signal group;
An abnormality detection method comprising: an output step of outputting information indicating the signal specified in the common signal specifying step.

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