JP5963697B2 - Charge determination device, charge determination method and charge determination program - Google Patents

Description

  The present invention relates to a technique for determining an operator who is in charge of recovery of a device in which a failure occurs when a failure occurs in a device used in each process of a production line.

  The production line consists of a plurality of processes, and equipment used in each process is installed. In the production line, processing is performed in order from the first process to the last process, and one product is produced. If a problem occurs in an apparatus used in a certain process and the process in that process is stopped, the processes in all processes after that process are affected. For this reason, when a malfunction occurs in the apparatus, it is desired to be restored early.

  Japanese Patent Application Laid-Open No. 2004-151858 describes that the proficiency level of the recovery work is stored for each operator, and when a malfunction occurs in the apparatus, the operator with the shortest recovery work time is determined as the person in charge of the recovery.

JP 2006-146876 A

However, there is no guarantee that there is an operator who is determined to be in charge near the device in which the problem has occurred, and considering the travel time to the device in which the problem has occurred, there is a risk that it will take a long time to recover. .
An object of the present invention is to, when a problem occurs in an apparatus used for each process of a production line, restore the malfunctioned apparatus at an early stage and increase the production amount of a product.

The responsible determination device according to the present invention is:
When a failure occurs in a device used in each process of a production line consisting of a plurality of processes, it is a responsible determination device that determines an operator who is responsible for recovery of the device in which the failure has occurred,
A device position storage unit for storing the position of each device;
An operator position detector for detecting the position of each operator;
A fault identification unit that identifies a faulty device as a faulty device;
As for the malfunctioning device identified by the malfunction identification unit, each operator moves to the location of the malfunctioning device from the position stored by the device location storage unit and the position of each operator detected by the operator position detection unit. A travel time calculator for calculating the travel time;
A proficiency storage unit for storing proficiency levels for each device of each operator;
Determination of responsibility for determining an operator who is responsible for recovery of the defective device from the moving time of each operator calculated by the moving time calculation unit and the proficiency level of each operator stored in the proficiency level storage unit for the defective device And a section.

  The person-in-charge determining apparatus according to the present invention determines an operator who is responsible for recovery of a device in which a problem has occurred, based on the travel time of the operator and the proficiency level of the device in which the problem has occurred. For this reason, it is possible to select a person in charge who can quickly recover a device in which a problem has occurred, and as a result, it is possible to increase the production amount of the product.

Explanatory drawing in the factory where the production line 1 was installed. 1 is a configuration diagram of a charge determination device 20 according to Embodiment 1. FIG. The figure which shows the information which the state memory | storage part 21 memorize | stores. The figure which shows the information which the buffer number memory | storage part 22 memorize | stores. The figure which shows the information which the operator position memory | storage part 23 memorize | stores. The figure which shows the information which the apparatus position memory | storage part 24 memorize | stores. The figure which shows the information which the proficiency degree memory | storage part 25 memorize | stores. The figure which shows the information which the charge information memory | storage part 26 memorize | stores. 5 is a flowchart showing the operation of the charge determination device 20 according to the first embodiment. Explanatory drawing of the determination method 1 of a priority. Explanatory drawing of the determination method 2 of a priority. Explanatory drawing of the determination method 3 of a priority. FIG. 3 is a diagram illustrating an example of a hardware configuration of a responsible determination device 20 according to the first embodiment.

Embodiment 1 FIG.
FIG. 1 is an explanatory diagram in a factory where a production line 1 is installed.
In FIG. 1, two production lines 1a and 1b are installed in the factory. The production line 1a is composed of four steps 2a to 5a, and processing is performed in the order of step 2a, step 3a, step 4a, and step 5a to produce a product. Similarly, the production line 1b includes four processes 2b to 5b, and the processes are performed in the order of the process 2b, the process 3b, the process 4b, and the process 5b to produce a product.
In the production lines 1a and 1b, apparatuses 6a to 9a and 6b to 9b used for processing of each process are installed. Specifically, the device 6a is used in step 2a, the device 7a is used in step 3a, the device 8a is used in step 4a, and the device 9a is used in step 5a. Similarly, device 6b is used in step 2b, device 7b is used in step 3b, device 8b is used in step 4b, and device 9b is used in step 5b.

In the vicinity of each of the devices 6a to 9a and 6b to 9b, a state monitoring device 10 for monitoring the operating state of the device is installed. The state monitoring device 10 is, for example, an imaging device such as a camera or a sensor such as a temperature sensor.
Further, in the vicinity of each of the devices 6a to 9a and 6b to 9b, a buffer monitoring device for monitoring the number of buffers 15 (semi-finished products) waiting for work in the device (or a process in which the device is used). 11 is installed. The buffer monitoring device 11 is an imaging device such as a camera, for example.

In the factory, there are three operators 12a to 12c in charge of the production lines 1a and 1b. The operators 12a to 12c do not stay in one place but move according to work or the like.
Each operator 12a to 12c is accompanied by a transmitter 13 such as a WiFi (Wireless Fidelity) tag, and a large number of receiving antennas 14 such as WiFi are installed in the factory. When the receiving antenna 14 receives the radio wave transmitted from the transmitter, the positions of the operators 12a to 12c can be specified.

FIG. 2 is a configuration diagram of the charge determination device 20 according to the first embodiment.
The charge determination device 20 includes a state storage unit 21, a buffer number storage unit 22, an operator position storage unit 23, a device position storage unit 24, a proficiency level storage unit 25, a charge information storage unit 26, a defect identification unit 27, and a buffer number monitoring unit. 28, a priority order determination unit 29, an operator position detection unit 30, a travel time calculation unit 31, a recovery time calculation unit 32, a charge determination unit 33, and a state update unit 34.

  The state storage unit 21 is a storage device that stores operating states of the devices 6a to 9a and 6b to 9b. As shown in FIG. 3, the state storage unit 21 stores state information indicating whether the device is in a normal operation state or a failure occurrence state where a failure has occurred for each device.

  The buffer number storage unit 22 is a storage device that stores the number of buffers waiting for work in each of the devices 6a to 9a and 6b to 9b. As shown in FIG. 4, for each apparatus, the number of buffers waiting for work in that apparatus is stored.

  The operator position storage unit 23 is a storage device that stores the positions of the operators 12a to 12c. As shown in FIG. 5, the operator position storage unit 23 stores a position for each operator. Here, the position is, for example, coordinate values in the factory (XY coordinate values if the factory is a flat floor), cell identification information when the factory is divided into cells, and the like.

  The device position storage unit 24 is a storage device that stores the positions of the devices 6a to 9a and 6b to 9b. As illustrated in FIG. 6, the device position storage unit 24 stores a position for each device and other equipment. Here, the position is a coordinate value or cell identification information, similar to the position of the operator.

  The proficiency storage unit 25 is a storage device that stores proficiency levels of the respective devices 6a to 9a and 6b to 9b of the operators 12a to 12c. As shown in FIG. 7, the proficiency level storage unit 25 stores the proficiency level for each operator 12 and each device, with the operator 12 on the vertical axis and the device on the horizontal axis. Here, the proficiency level is a value indicating how much the operator 12 is proficient in the apparatus, and based on the proficiency level, it is possible to calculate the approximate recovery time required for recovering the apparatus.

  The assigned information storage unit 26 is a storage device that stores whether each of the operators 12a to 12c is in charge of recovery. As shown in FIG. 8, the responsible information storage unit 26 stores, for each operator 12, responsible information indicating whether the operator is in charge of recovery or the non-responsible state not in charge of recovery.

  The defect identifying unit 27 monitors the operating states of the devices 6a to 9a and 6b to 9b by the state monitoring device 10, and periodically stores the state information of the devices 6a to 9a and 6b to 9b in the state storage unit 21. .

  The buffer number monitoring unit 28 detects the number of buffers waiting for work in each of the devices 6a to 9a and 6b to 9b by the buffer monitoring device 11, and periodically stores the detected number of buffers in the buffer number storage unit 22. .

  The priority order determination unit 29 determines the priority order of restoration based on the cycle time and the number of buffers of each of the devices 6a to 9a and 6b to 9b when a failure occurs in a plurality of devices. The cycle time is an average time required for processing one buffer 15 in the apparatus. It is assumed that the priority order determination unit 29 stores in advance the cycle times of the devices 6a to 9a and 6b to 9b. The priority order determination method will be described later in detail.

  The operator position detection unit 30 periodically detects the positions of the operators 12 a to 12 c by the transmitter 13 and the receiving antenna 14 and stores them in the operator position storage unit 23. Note that any method may be used as a method for specifying the position.

The movement time calculation unit 31 determines whether each operator 12a to 12c is based on the position of each operator 12a to 12c stored in the operator position storage unit 23 and the position of the device in which the malfunction is stored in the device position storage unit 24. Calculate the travel time required to move to the device where the fault occurred.
The travel time calculation unit 31 is not the time required to move the linear distance between the operator 12 and the device in which the malfunction occurred, but the malfunction occurred in the operator through a movable route in the factory. The time taken to move to the device is calculated as the travel time. For example, the travel time calculation unit 31 may calculate a route that can be moved by the operator 12 from the positions of the devices and equipment stored in the device position storage unit 24, or may store a route that can be moved separately by the operator 12. An apparatus may be prepared and used.

  The recovery time calculation unit 32 is a recovery time that is assumed to be required for each operator 12 to recover the device in which the failure has occurred, based on the proficiency level for the device in which the failure has been stored for each operator 12 by the proficiency level storage unit 25. Calculate It is assumed that the method for calculating the recovery time is predetermined.

  The person-in-charge determining unit 33 determines an operator in charge of restoration in order from the device with the highest priority determined by the priority-order determining unit 29. The person-in-charge determining unit 33 includes the travel time calculated by the travel time calculating unit 31 and the recovery time calculating unit 32 among the operators 12 stored in the non-responsible state in which the responsible information storage unit 26 is not in charge of recovery. The operator 12 having a short total time with the restoration time calculated by the above is determined as the operator 12 in charge of restoration.

  The state update unit 34 updates the charge information stored in the charge information storage unit 26 to the charge state for the operator 12 that the charge determination unit 33 determines to be in charge of recovery. In addition, the state update unit 34 updates the charge information stored in the charge information storage unit 26 to the non-charge state for the operator 12 who has been in charge of the device whose state information has been updated from the failure occurrence state to the normal operation state.

FIG. 9 is a flowchart showing the operation of the charge determination device 20 according to the first embodiment.
Periodically, the defect identification unit 27 updates the state information stored in the state storage unit 21 (S11), the buffer number monitoring unit 28 updates the buffer number stored in the buffer number storage unit 22 (S12), and the operator position The detection unit 30 updates the position of the operator 12 stored in the operator position storage unit 23 (S13).

  If there is a device in which the state information stored in the state storage unit 21 is updated to a defective state, the priority order determination unit 29 determines the priority order for recovery (S14).

  For each of the operators 12a to 12c, the movement time calculation unit 31 calculates the movement time to the device with the higher priority determined in S14 (S15), and the recovery time calculation unit 32 has the priority determined in S14. The recovery time of the high device is calculated (S16). Then, the charge determination unit 33 stores the movement time calculated in S15 and the recovery time calculated in S16 among the operators 12 stored as being in a non-charge state in which the charge information storage unit 26 is not in charge of recovery. The operator 12 whose total time is short is determined as the person in charge of restoration (S17). The state update unit 34 updates the charge information stored in the charge information storage unit 26 to the charge state for the operator 12 determined as the person in charge of recovery in S17 (S18).

  If there is a device for which the person in charge has not been determined, the process returns to S15 (S19), and the person in charge of the device with the highest priority among the devices for which the person in charge has not been determined is determined (S15-). S18).

  Further, when the status information of the device in S11 is updated from the failure occurrence state to the normal operation state, the status update unit 34 stores the charge information stored in the charge information storage unit 26 for the operator 12 who was responsible for the device. Is updated to the unassigned state (S20).

A method by which the priority order determination unit 29 determines the priority order will be described.
Here, three methods of determination method 1 to determination method 3 will be described.

FIG. 10 is an explanatory diagram of the priority order determination method 1.
The priority order determination unit 29 has a short time obtained by multiplying the cycle time of a device (hereinafter referred to as the next device) used for the next process of the device in which the problem has occurred by the number of buffers waiting for processing of the next device. The higher the priority, the higher the device.
In FIG. 10, a defect occurs in the shaded devices 6a and 8a. The next device used for the next step of the device 6a is the device 7a, and the next device used for the next step of the device 8a is the device 9a. Therefore, in the determination method 1, the priority order determination unit 29 uses the cycle time (10s) of the device 7a multiplied by the number of buffers (7) (70s) and the cycle time (12s) of the device 9a to the number of buffers (6 ) Is compared with the time (72 s) multiplied. Then, the priority order determination unit 29 increases the priority order of the device 6a in which the short device 7a is the next device, and lowers the priority order of the device 8a in which the long time device 9a is the next device. .
The time obtained by multiplying the cycle time by the number of buffers means an allowance time during which the work can be continued even if the buffer 15 is not output from the device in the previous process. The determination method 1 is based on the idea that it is necessary to increase the priority of the device in the previous process of the device with a short margin time and restore it early.

FIG. 11 is an explanatory diagram of the priority order determination method 2.
The priority order determination unit 29 determines the cycle of the device in which the failure has occurred from the time obtained by multiplying the cycle time of the next device used for the next process of the device in which the failure has occurred by the number of buffers waiting for processing of the next device. The higher the priority is, the shorter the time minus the time is.
In FIG. 11, a malfunction occurs in the shaded devices 6a and 8a. The next device used for the next step of the device 6a is the device 7a, and the next device used for the next step of the device 8a is the device 9a. Therefore, in the determination method 2, the priority determination unit 29 subtracts the cycle time (10s) of the device 6a from the time (70s) obtained by multiplying the cycle time (10s) of the device 7a by the number of buffers (7) ( 60s) and the time (57s) obtained by subtracting the cycle time (15s) of the device 8a from the time (72s) obtained by multiplying the cycle time (12s) of the device 9a by the number of buffers (6). Then, the priority order determination unit 29 increases the priority order of the device 8a in which the device 9a having a short time is the next device, and lowers the priority order of the device 6a in which the device 7a having a long time is the next device. .
As described above, the time obtained by multiplying the cycle time by the number of buffers means an allowance time during which the work can be continued even if the buffer 15 is not output from the device in the previous process. On the other hand, the cycle time of the apparatus in the previous process means the time required from the start of operation of the apparatus to the output of the buffer 15 to the next process. Therefore, if the device in which the problem has occurred is restored by the time obtained by subtracting the necessary time from the spare time, the work will not stop in the next process. The determination method 2 is based on the idea that it is necessary to increase the priority of the device in the previous process of the device having a shorter time obtained by subtracting the necessary time from the margin time, and to restore it earlier.

FIG. 12 is an explanatory diagram of the priority order determination method 3.
The priority order determination unit 29 increases the priority order of a device having a longer cycle time among devices in which a failure has occurred.
In FIG. 12, a problem occurs in the shaded devices 6a and 8a. Therefore, in the determination method 3, the cycle time (10 s) of the device 6a is compared with the cycle time (15 s) of the device 8a. And the priority order determination part 29 makes the priority of the apparatus 8a with long time high, and makes the priority of the apparatus 6a with short time low.
An apparatus having a long cycle time is highly likely to become a bottleneck in product production in the production line 1. The determination method 3 is based on the idea that a device having a long cycle time that is likely to become a bottleneck needs to have a higher priority and be restored earlier.

  In addition, when the time used as a comparison object becomes the same by the determination methods 1-3, a priority is made high as the apparatus utilized by the previous process. This is because if a problem occurs in the previous process, the subsequent process may be in a waiting state even if no problem occurs in the subsequent process.

Similarly, when a problem occurs in a plurality of production lines 1, the higher the priority is given to the device used in the previous process.
For example, it is assumed that a failure occurs in the device 7a of the production line 1a and the device 8b of the production line 1b, and the time related to the device 7a and the time related to the device 8b are the same. In this case, the device 7a is a device that is used in the second step from the front in the production line 1a, and the device 8b is a device that is used in the third step from the front in the production line 1b. Therefore, the priority of the device 7a is increased and the priority of the device 8b is decreased.
In addition, here, it was determined which device was used in the first process from the front of each production line 1 and which was used in the previous process. However, it is possible to determine which device is used in the previous process by determining what number of process is used after each production line 1.

In addition, in a plurality of production lines 1, when the time to be compared in the determination methods 1 to 3 is the same, and the order of the steps (the number from the front or the number from the back) is also the same The priority of the shorter total time of the travel time and the recovery time may be set higher. This is because both devices have the same impact on the production of products, so it is possible to produce more products by giving priority to restoring those who can recover faster. .
In addition, when the importance is determined for each production line 1 in advance and the time to be compared in the determination methods 1 to 3 is the same and the order of the processes is also the same, the production line 1 having the higher importance You may make a priority high.

  As described above, the responsible determination device 20 according to the first embodiment is based on the operator 12 who is responsible for the recovery of the device in which the failure has occurred, based on the travel time of the operator 12 and the proficiency level of the device in which the failure has occurred in the operator 12. To decide. For this reason, it is possible to select a person in charge who can quickly recover a device in which a problem has occurred, and as a result, it is possible to increase the production amount of the product.

  Further, the responsible determination device 20 according to the first embodiment determines the restoration priority based on the cycle time of the device and the number of buffers. For this reason, it is possible to restore the device that has a large influence on the production of the product earlier, and as a result, it is possible to increase the production amount of the product.

FIG. 13 is a diagram illustrating an example of a hardware configuration of the charge determination device 20 according to the first embodiment.
As shown in FIG. 13, the charge determination device 20 includes a CPU 911 (also referred to as a central processing unit, a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a processor) that executes a program. The CPU 911 is connected to the ROM 913, the RAM 914, the LCD 901 (Liquid Crystal Display), the keyboard 902 (K / B), the communication board 915, and the magnetic disk device 920 via the bus 912, and controls these hardware devices. Instead of the magnetic disk device 920 (fixed disk device), a storage device such as an optical disk device or a memory card read / write device may be used. The magnetic disk device 920 is connected via a predetermined fixed disk interface.

  An operating system 921 (OS), a window system 922, a program group 923, and a file group 924 are stored in the magnetic disk device 920 or the ROM 913. The programs in the program group 923 are executed by the CPU 911, the operating system 921, and the window system 922.

The program group 923 includes “defect identification unit 27”, “buffer number monitoring unit 28”, “priority order determination unit 29”, “operator position detection unit 30”, “travel time calculation unit 31”, “ Stored are software, programs, and other programs that execute the functions described as the “recovery time calculation unit 32”, “department determination unit 33”, “state update unit 34”, and the like. The program is read and executed by the CPU 911.
In the file group 924, the “state storage unit 21”, “buffer number storage unit 22”, “operator position storage unit 23”, “device position storage unit 24”, “skill level storage unit 25”, “ Information, data, signal values, variable values, and parameters stored in the charge information storage unit 26 ”are stored as items of the“ database ”. The “database” is stored in a recording medium such as a disk or a memory. Information, data, signal values, variable values, and parameters stored in a storage medium such as a disk or memory are read out to the main memory or cache memory by the CPU 911 via a read / write circuit, and extracted, searched, referenced, compared, and calculated. Used for the operation of the CPU 911 such as calculation / processing / output / printing / display. Information, data, signal values, variable values, and parameters are temporarily stored in the main memory, cache memory, and buffer memory during the operation of the CPU 911 for extraction, search, reference, comparison, calculation, calculation, processing, output, printing, and display. Is remembered.

In the above description, the arrows in the flowchart mainly indicate input / output of data and signals, and the data and signal values are recorded in a memory of the RAM 914, other recording media such as an optical disk, and an IC chip. Data and signals are transmitted online by a bus 912, signal lines, cables, other transmission media, and radio waves.
In addition, what is described as “to part” in the above description may be “to circuit”, “to device”, “to device”, “to means”, and “to function”. It may be “step”, “˜procedure”, “˜processing”. In addition, what is described as “˜device” may be “˜circuit”, “˜device”, “˜means”, “˜function”, and “˜step”, “˜procedure”, “ ~ Process ". That is, what is described as “˜unit” may be realized by firmware stored in the ROM 913. Alternatively, only software, hardware such as elements, devices, substrates, and wirings, a combination of software and hardware, or a combination of firmware may be used. Firmware and software are stored in a recording medium such as ROM 913 as a program. The program is read by the CPU 911 and executed by the CPU 911. That is, the program causes a computer or the like to function as the “˜unit” described above. Alternatively, the computer or the like is caused to execute the procedures and methods of “to part” described above.

  1 production line, 2, 3, 4, 5 process, 6, 7, 8, 9 device, 10 status monitoring device, 11 buffer monitoring device, 12 operator, 13 transmitter, 14 receiving antenna, 15 buffer, 20 Device, 21 Status storage unit, 22 Buffer number storage unit, 23 Operator position storage unit, 24 Device position storage unit, 25 Proficiency level storage unit, 26 Charge information storage unit, 27 Defect identification unit, 28 Buffer number monitoring unit, 29 Priority Rank determination unit, 30 operator position detection unit, 31 movement time calculation unit, 32 recovery time calculation unit, 33 charge determination unit, 34 state update unit.

Claims (7)

When a failure occurs in a device used in each process of a production line consisting of a plurality of processes, it is a responsible determination device that determines an operator who is responsible for recovery of the device in which the failure has occurred,
A device position storage unit for storing the position of each device;
An operator position detector for detecting the position of each operator;
A fault identification unit that identifies a faulty device as a faulty device;
As for the malfunctioning device identified by the malfunction identification unit, each operator moves to the location of the malfunctioning device from the position stored by the device location storage unit and the position of each operator detected by the operator position detection unit. A travel time calculator for calculating the travel time;
A proficiency storage unit for storing proficiency levels for each device of each operator;
When the defect specifying unit specifies a plurality of defective devices, from the time obtained by multiplying the cycle time of the next device, which is a device used for the next process of the defective device, by the number of buffers waiting for processing of the next device. A priority order determination unit that determines the priority of recovery so that the priority order of the faulty device with a shorter time obtained by subtracting the cycle time of the faulty device is higher;
In order from the device with the highest priority determined by the priority determination unit, the movement time of each operator calculated by the movement time calculation unit, and the proficiency level of each operator for the defective device stored in the proficiency level storage unit, And a charge determination unit for determining an operator in charge of recovery of the defective device. The said charge determination part determines the operator with the short total time of the recovery time concerning recovery calculated from the said proficiency, and the said movement time to the operator in charge of recovery, The claim 1 characterized by the above-mentioned. The assigned decision-making device. 3. The assigned determination apparatus according to claim 1, wherein, when there is a defective device of the same time, the priority determination unit increases the priority of the defective device used in the previous process. The responsible determination device further includes:
Each operator has a responsible information storage unit for storing responsible information indicating whether or not the operator is in charge of recovery of the defective device,
The responsible determination unit determines an operator who is responsible for recovery of a defective device from operators indicating that the responsible information stored in the responsible information storage unit is not responsible for recovery of the defective device. The charge determination device according to any one of claims 1 to 3 . The responsible determination device further includes:
The apparatus according to claim 1, further comprising: a state update unit that updates the charge information of an operator who is in charge of recovery of the defective device to a state that is not in charge of recovery of the defective device when the defective device is recovered. 4. The charge determination device according to 4 . It is a charge determination method for determining an operator who is in charge of recovery of a device in which a failure has occurred when a failure occurs in a device used in each process of a production line consisting of a plurality of processes.
An operator position detecting step in which the processing device detects the position of each operator;
A failure identification step in which the processing device identifies the device in which the failure has occurred as a failure device; and
The processing device calculates the travel time required for each operator to move to the faulty device from the location of the faulty device identified in the fault identification step and the position of each operator detected in the operator position detection step. The travel time calculation process to
When the processing device identifies a plurality of defective devices in the defect specifying step, the number of buffers waiting for processing of the next device is calculated in the cycle time of the next device which is a device used in the next process of the defective device. A priority order determining step for determining the priority of recovery so that the priority order of the faulty device with a shorter time obtained by subtracting the cycle time of the faulty device from the multiplied time,
From the device having the higher priority determined in the priority determination step , the processing device calculates the failure time from the movement time of each operator calculated in the movement time calculation step and the proficiency level of each operator for the defective device. A charge determination method comprising: a charge determination process for determining an operator in charge of restoration of an apparatus. It is a charge determination program that determines the operator who is responsible for the recovery of the device in which the failure occurs when a failure occurs in the device used in each process of the production line consisting of multiple processes.
An operator position detection process for detecting the position of each operator;
A fault identification process for identifying a faulty device as a faulty device;
Movement time calculation for calculating the movement time required for each operator to move to the position of the defective device from the position of the defective device identified by the defect identification processing and the position of each operator detected by the operator position detection processing Processing,
When a plurality of defective devices are specified in the defect specifying process, from the time obtained by multiplying the cycle time of the next device, which is a device used in the next process of the defective device, by the number of buffers waiting for the processing of the next device. A priority determination process for determining the priority of recovery so that the priority of the defective device with a shorter time obtained by subtracting the cycle time of the defective device is higher;
In order from the device with the highest priority determined in the priority determination processing, the failure device is restored from the movement time of each operator calculated in the movement time calculation processing and the proficiency level of each operator for the failure device. A charge determination program that causes a computer to execute charge determination processing for determining an operator in charge.

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