JP6843673B2 - Process control system and process control method - Google Patents

Description

The present invention relates to a process control system and a process control method.

As a system for acquiring measurement data, work progress information, etc. in the manufacturing process and performing quality control and process control, for example, in Patent Document 1, a worker is positioned by a portable terminal possessed by each worker. A management system that acquires work sites, work contents, construction images, etc. and aggregates them on a management server is disclosed.

Japanese Patent No. 5973095

In a conventional system, a huge amount of data related to process management is aggregated and managed on a management server. Therefore, the management server is required to have high performance and a large capacity, which causes an increase in the cost for constructing the system. ing.
In addition, security is required to be strengthened in order to prevent cyber attacks on the management server and data falsification by workers, but strengthening the security function of the system requires a large cost.

The present invention has been made in view of such a problem, and provides a process control system and a process control method capable of suppressing falsification of information related to process control with an inexpensive configuration.

In order to solve the above problems, the present invention employs the following means.
According to the first aspect of the present invention, the process control system that manages the manufacturing process includes a distributed storage system in which each of a plurality of arithmetic devices that store information related to process control is a node, and the process control. It is provided with an input device that accepts input of such information.
The input device is a process of creating process information in which product information for identifying a product is associated with process stages executed by an operator for the product and processing stage information indicating the contents of the process stages. It has an information creation unit and a storage request unit that outputs a storage request for storing transaction data including the process information in the distributed storage system.
At least one of the arithmetic units includes a determination unit that determines whether or not the process information shown in the storage request satisfies a predetermined completion condition, and process information that the determination unit determines that the completion condition is satisfied. A block creation unit that creates block data based on transaction data including, and the block data are shared between all the arithmetic units, and the block data and the block data shared in the past are displayed in chronological order. It has a shared processing unit that is connected and stored in a storage unit.
By doing so, when the process information is falsified by a cyber attack or the like, the process management system includes all the block data including the process information to be falsified and the block data created after the block data. Since it is necessary to tamper with, the difficulty of tampering can be increased. Therefore, the process management system can improve the security by suppressing the falsification of the process information by increasing the difficulty of falsification in the entire system.
Further, in the above-mentioned process control system, it is not necessary to prepare a management server having high performance and advanced security functions, so that the introduction cost of the process control system can be kept low.

According to the second aspect of the present invention, in the process control system according to the first aspect described above, the determination unit includes information for approving the completion of the process step in the process information. , It is determined that the process information satisfies the completion condition.
By doing so, the determination unit determines that only the process information approved by the manager satisfies the completion condition for the process stage requiring the approval of the manager. As a result, only transaction data including process information confirmed and approved by the administrator is shared as block data, which suppresses fraud in which the worker reports that the process stage has been completed without the approval of the administrator. be able to.

According to the third aspect of the present invention, in the process control system according to the first or second aspect described above, the input device stores transaction data including the first process information indicating the first process step. When the request is output, it is approved that the second process step has been completed in the transaction data including the second process information indicating the second process step which is the pre-process of the first process step. If no information is included, it acknowledges that the second step has been completed.
By doing so, when the approval by the manager is delayed in the previous process, the input device can approve that the second process step, which is the previous process, has been completed. As a result, it is possible to prevent the progress of the actual process stage from deviating from the progress of the process stage on the process management system due to the waiting for approval by the manager.

According to the fourth aspect of the present invention, the process control system according to any one of the above-mentioned first to third aspects further includes a database for registering the process information.
At least one of the arithmetic units is a database in which a hash generation unit that calculates a hash value based on process information that the determination unit determines that the completion condition is satisfied, and the process information and the hash value are associated with each other. It also has a data registration unit to be registered in. The block creation unit creates the block data including the hash value.
Since the process information is divided into block data in the arithmetic unit, complicated processing is required in the arithmetic unit in order for the operator and the manager to search and extract the desired process information by referring to the block data. there is a possibility. However, in the above-described embodiment, since the process information is registered in the database, it is not necessary to provide a function for searching and extracting the process information in the arithmetic unit. Therefore, the development cost of the process control system can be reduced.
Further, in the above-mentioned process management system, the worker and the manager can easily read the desired process information from the process information registered in the database.

According to the fifth aspect of the present invention, in the process control system according to the fourth aspect described above, at least one of the arithmetic units is stored in the hash value registered in the database and in the storage unit. It further has a data verification unit that detects whether or not the process information registered in the database has been tampered with based on the hash value included in the block data.
By doing so, the data verification unit can easily detect whether or not the process information registered in the database has been tampered with by comparing the hash value registered in the database with the hash value contained in the block data. can do.

According to the sixth aspect of the present invention, the process control system according to any one of the first to fifth aspects described above is an information acquisition system that creates progress information indicating the progress of the product process for each product. Further prepare.
At least one of the arithmetic units further includes an identifier generation unit that generates an identifier indicating a product and a process stage of process information that the determination unit has determined to satisfy the completion condition.
The block creation unit creates the block data including the identifier.
The information acquisition system has a progress information creating unit that creates the progress information based on the identifier included in the block data shared in the distributed storage system.
By doing so, the process management system can easily search and extract desired process information from the block data based on the identifier. In addition, the worker and the manager can recognize the progress of the product process for each product by referring to the progress information created based on the identifier.

According to a seventh aspect of the present invention, the process management method for managing a manufacturing process is a storage step in which the information is distributed and stored with each of a plurality of arithmetic devices for storing information related to the process control as nodes. And an input step that accepts the input of the information related to the process control.
The input step is a step of creating process information in which product information for specifying a product is associated with process steps executed for the product by an operator and process step information indicating the contents of the process steps. It has an information creation step and a storage request step for outputting a storage request for storing transaction data including the process information in the plurality of arithmetic devices.
The storage step includes a determination step for determining whether or not the process information shown in the storage request satisfies a predetermined completion condition, and a transaction including process information determined to satisfy the completion condition in the determination step. The block creation step for creating block data based on the data, the block data is shared with all the arithmetic units, and the block data and the block data shared in the past are connected in chronological order. It has a shared processing step of storing in a storage unit.

According to the process control system and the process control method according to the present invention, it is possible to suppress falsification of information related to process control with an inexpensive configuration.

It is a figure which shows the outline of the process control system which concerns on 1st Embodiment. It is a figure which shows the functional structure of the process control system which concerns on 1st Embodiment. It is a processing flow of the input device which concerns on 1st Embodiment. It is a processing flow of the arithmetic unit which concerns on 1st Embodiment. It is a figure which shows the hardware configuration of the input device and the arithmetic unit which concerns on 1st Embodiment. It is a figure which shows the functional structure of the process control system which concerns on 2nd Embodiment. This is the first processing flow of the arithmetic unit according to the second embodiment. This is the second processing flow of the arithmetic unit according to the second embodiment. It is a figure which shows the functional structure of the process control system which concerns on 3rd Embodiment. It is a processing flow of the arithmetic unit which concerns on 3rd Embodiment. It is a figure which shows the functional structure of the process control system which concerns on 4th Embodiment.

<First Embodiment>
Hereinafter, the process control system 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

(Overall configuration of process control system)
FIG. 1 is a diagram showing an outline of a process management system according to the first embodiment.
As shown in FIG. 1, the process control system 100 includes shops P1 to Pn that execute at least one of a plurality of process steps in a product manufacturing process. The process steps indicate, for example, each process such as acceptance, cleaning, temporary assembly, welding, finishing, and measurement of parts and intermediate manufactured products. The shops P1 to Pn may be a factory or a production line owned by a manufacturing company, or may be a supplier for manufacturing parts, a product, or an assembly maker for assembling intermediate manufactured products.

Further, the process control system 100 includes an input device 20 and a distributed storage system 6.

The input device 20 is a device for receiving input of information related to process control of the product, and is provided at least one in each of the shops P1 to Pn. One input device 20 may be prepared for each process stage, and a plurality of input devices 20 may be provided in a shop that executes a plurality of process stages.

The distributed storage system 6 is a system for storing information related to process management of a product input by the input device 20 by using each of the plurality of arithmetic units 60 as a node.
At least one arithmetic unit 60 is provided in each of the shops P1 to Pn. The arithmetic unit 60 may be prepared one by one for each process stage, and a plurality of arithmetic units 60 may be provided in a shop that executes a plurality of process stages.
Each of the plurality of arithmetic units 60 is communicably connected via a wired or wireless network NW. Further, the input device 20 and the arithmetic unit 60 provided in each of the shops P1 to Pn may be connected by a dedicated communication line or may be connected via a network NW.

(Functional configuration of input device)
FIG. 2 is a diagram showing a functional configuration of the process management system according to the first embodiment.
Hereinafter, the functional configurations of the input device 20 and the arithmetic unit 60 included in the process management system 100 will be described with reference to FIG. The input device 20 and the arithmetic unit 60 provided in the shops P1 to Pn have a common functional configuration with each other. Therefore, in the following, the input device 20 and the arithmetic unit 60 of the shop P1 will be described as an example.

First, the input device 20 will be described with reference to FIG.
As shown in FIG. 2, the input device 20 includes a reception unit 21, a display unit 22, a communication unit 23, a storage unit 24, and a CPU 25.

The reception unit 21 is a device that receives operations by workers (including workers in the manufacturing company and workers outside the company such as suppliers) who execute the process stages assigned to the shop P1, and is, for example, a keyboard, a mouse, and the like. Input device. Further, the reception unit 21 may be a code reader that reads information from a code such as a barcode attached to a part or an intermediate manufactured product, or a sensor device that measures the weight, shape, or the like of the part or the intermediate manufactured product. It may be.
The reception unit 21 receives input of information (fixed information) related to product process management based on the operation of the operator. Further, the reception unit 21 may automatically accept the input of the process information of the product. For example, the reception unit 21 may automatically read information on process control from a part of a product and an intermediate manufactured product placed at a predetermined position by a code reader or the like.
The information regarding the process control of the product (process information) includes, for example, product information for identifying the product, the process stage executed by the operator, and processing stage information indicating the contents of the process stage.
The product information includes, for example, a product number that can identify the product to be manufactured. The processing stage information is, for example, information indicating a process stage (each process such as acceptance, cleaning, temporary assembly, welding, finishing, measurement, and testing of parts and intermediate products), and information indicating a shop that executes the process stage (information indicating a shop that executes the process stage). Shop number), information indicating the worker who executes the process stage (worker's signature), part number that can identify the parts used in the process stage, execution content (working time, equipment used, drug information, etc.) , Execution result (information indicating the start or completion of the process, measurement result), etc. are included.
The worker inputs the process information to the input device 20 using each unique account. At this time, the worker selects and inputs the corresponding information from the list of the product number, the process stage, the shop number, the worker, and the part number stored in the storage unit 24 in advance via the reception unit 21. Alternatively, any character string may be entered. In addition, the worker may upload a file including test results such as a test run of a product and a quality check via the reception unit 21. Further, the worker may log in with his / her own account in advance so that the input of the process information automatically read by the reception unit 21 can be received by using the worker's account.
Further, the reception unit 21 may accept an operation of reading past process information stored as block data in the arithmetic unit 60, which will be described later, based on the operation of the operator or the manager.

The display unit 22 is a device for displaying information related to process management processing, and is, for example, a display device such as a liquid crystal display.
On the display unit 22, various information received by the reception unit 21, process information read from the arithmetic unit 60, and the like are displayed.

The communication unit 23 transmits and receives various information to and from the arithmetic unit 60 via the network NW or a dedicated line.

The storage unit 24 stores in advance a list of product numbers, process stages, shop numbers, workers, part numbers, and the like.

The CPU 25 has a process information creation unit 251 and a storage request unit 252.
The process information creation unit 251 creates process information in which the product information received by the reception unit 21 and the processing stage information are associated with each other.
Further, in the present embodiment, the process information creation unit 251 creates transaction data including the process information and information indicating whether or not the process information satisfies the completion condition, and outputs the transaction data to the storage request unit 252.
The information indicating whether or not the completion condition is satisfied is, for example, information indicating whether or not the process stage included in the process information requires the approval of the manager. Further, in the case of a process step requiring the approval of the administrator, the transaction data may further include information indicating whether or not the process step has been approved by the administrator.

The storage request unit 252 outputs a storage request requesting that the transaction data including the process information be stored in the distributed storage system 6 as block data.
The block data is a block of data of an arbitrary size and may be expressed as a data set.

(Functional configuration of distributed storage system)
Hereinafter, the functional configuration of the distributed storage system 6 according to the present embodiment will be described with reference to FIG.
In the present embodiment, the distributed storage system 6 is a system using a distributed ledger technology such as a blockchain, and each of the plurality of arithmetic units 60 is used as a node, and block data and transactions in which a plurality of process information are collected are collected. Data is stored synchronously between each node.
As shown in FIG. 2, the arithmetic unit 60 included in the distributed storage system 6 includes a communication unit 61, a storage unit 62, and a CPU 65.

The communication unit 23 transmits and receives various information to and from the other arithmetic unit 60 via the network NW. Further, the communication unit 23 transmits and receives various information to and from the input device 20 via the network NW or a dedicated line.

The storage unit 62 stores transaction data including process information collected from the input device 20. Further, the storage unit 62 stores the block data created by the block creation unit 652, which will be described later.

The CPU 65 includes a process information acquisition unit 651, a block creation unit 652, a determination unit 653, and a shared processing unit 654.

The process information acquisition unit 651 acquires transaction data including process information together with a storage request from the input device 20 and stores it in the storage unit 62.
Further, in the present embodiment, when the process information acquisition unit 651 acquires transaction data from the input device 20, the transaction data is transferred to another arithmetic unit 60, and the same transaction data is accumulated in all the arithmetic units 60. To do so.

The block creation unit 652 creates block data based on the transaction data stored in the storage unit 62, which is determined by the determination unit 653, which will be described later, to satisfy a predetermined completion condition. For example, the block creation unit 652 contains block data including a plurality of transaction data determined to satisfy the completion condition in a predetermined period (for example, about 10 minutes) and a hash value calculated based on the previously created block data. create.
Transaction data that does not satisfy the predetermined completion condition and is not included in the block data is retained in the storage unit 62 for a certain period of time (for example, 24 hours) and then deleted.

When the storage request is output from the input device 20, the determination unit 653 determines whether or not the process information acquired by the process information acquisition unit 651 satisfies a predetermined completion condition.
The completion condition is a standard for determining whether or not a process step may be completed and the process may proceed to the next process step. In the present embodiment, when the process information includes a process step that does not require the approval of the manager, the determination unit 653 determines that the process information satisfies the completion condition. In the present embodiment, when the transaction data includes information indicating that the approval of the administrator is not required, the determination unit 653 determines that the process information included in the transaction data satisfies the completion condition. judge.
Further, the determination unit 653 satisfies the completion condition when the process information includes the process step requiring the approval of the manager and the information indicating that the manager has approved the completion of the process step is included. Is determined. In the present embodiment, the determination unit 653 includes information indicating that the approval of the administrator is required in the transaction data, and the information indicating the approval of the administrator (signature of the administrator). If is included, it is determined that the process information satisfies the completion condition, and if the information indicating the approval of the administrator (signature of the administrator) is not included, the process information satisfies the completion condition. Judge that there is no.

The sharing processing unit 654 shares the block data created by the block creation unit 652 among all the arithmetic units 60, connects the block data and the block data shared in the past in chronological order, and stores the block data in the storage unit 62. To do. Further, the transaction data included in the shared block data is deleted from the storage unit 62 of each arithmetic unit 60.

(Processing flow of input device)
FIG. 3 is a processing flow of the input device according to the first embodiment.
Hereinafter, with reference to FIG. 3, the flow of processing in which the input device 20 according to the present embodiment requests the storage of transaction data will be described.
As shown in FIG. 3, first, the reception unit 21 of the input device 20 receives the input of the product information and the processing stage information (step S100).
For example, in shop P1, it is assumed that the worker has completed the process step of receiving the parts used in the product. At this time, the worker inputs the product information including the product number of the product via the reception unit 21. In addition, the worker uses the reception unit 21 to provide information indicating the process stage of "accepting parts", the shop number (P1) of the shop P1, the signature of the worker, the part number of the accepted part, and the relevant parts. Input processing stage information including information indicating that the part receiving process has been completed. Further, the reception unit 21 may accept the input of such information by automatically reading the product information and the processing stage information from the barcode or the like.
At this time, the display unit 22 displays product information and processing stage information input by the operator via the reception unit 21, a list of product numbers read from the storage unit 24 based on the operator's operation, and the like. To.

Next, the process information creation unit 251 of the input device 20 creates process information in which the product information received by the reception unit 21 and the processing stage information are associated with each other (step S101). Further, in the present embodiment, the process information creation unit 251 creates transaction data including the process information and information indicating whether or not the process information satisfies the completion condition, and outputs the transaction data to the storage request unit 252.

Next, the storage request unit 252 of the input device 20 outputs a storage request for storing the transaction data created by the process information creation unit 251 in the distributed storage system 6 (step S102).
The input device 20 repeats the above steps S100 to S102 every time the reception unit 21 receives the input of the process information.

In this embodiment, it is assumed that the approval of the manager is required for some process stages. For example, when all the process stages in the shop P1 are completed and the intermediate manufactured product is delivered to the next shop P2, the approval of the manager of the shop P1 is required.
In this case, the worker uses the multi-signature function to input process information and request storage of transaction data. The multi-signature function prevents the transaction data from being stored in the block data (it is determined by the arithmetic unit 60 that the predetermined completion condition is not satisfied) until a plurality of preset signatures are input to the transaction data. It is a function.
Specifically, in the above-mentioned processing flow, the reception unit 21 has a multi-signature function that requires the signatures of both the operator and the administrator when receiving the input of the process information of the process stage that requires the approval of the administrator. The input of product information and processing stage information is accepted using a valid account (step S100).
Then, the process information creation unit 251 creates process information (unapproved process information) in which the product information and the processing stage information received via the reception unit 21 are associated with each other (step S101), and the process information and the process information. Create transaction data including information indicating that the process stage included in the process information requires the approval of the administrator (information indicating that the multi-signature function is used). Further, at this time, the process information creation unit 251 creates transaction data in which only the operator's signature is input and the administrator's signature is not included.
The storage request unit 252 outputs a storage request for transaction data including unapproved process information created by the process information creation unit 251 (step S102). Since the transaction data includes information indicating that the approval of the administrator is required and does not include information indicating approval by the administrator (signature of the administrator), it is determined by the determination unit 653 of the arithmetic unit 60. It is determined that the completion condition of is not satisfied. Therefore, the transaction data is not included in the block data and is held in the storage unit 62 of the arithmetic unit 60 as unprocessed.
Next, when the manager confirms the content of the unapproved process information and the intermediate manufactured product, the manager inputs the signature (approval) of the manager via the reception unit 21 (step S100).
Then, the process information creation unit 251 creates process information (approved process information) indicating that the unapproved process information has been approved by the manager (step S101), and approves the process information and the manager. Create transaction data including the information to be shown (administrator's signature).
The storage request unit 252 outputs a storage request for transaction data including the approved process information created by the process information creation unit 251 (step S102). Since the transaction data including the approved process information includes the signature of the administrator, it is determined by the determination unit 653 of the arithmetic unit 60 that the predetermined completion condition is satisfied.

(Processing flow of arithmetic unit)
FIG. 4 is a processing flow of the arithmetic unit according to the first embodiment.
Hereinafter, the flow of processing in which the arithmetic unit 60 according to the present embodiment shares the block data will be described with reference to FIG.
The process information acquisition unit 651 of the arithmetic unit 60 stores transaction data including the process information acquired from the input device 20 in the storage unit 62. The determination unit 653 first determines whether or not the approval (signature) of the administrator is required for each of the transaction data stored in the storage unit 62 (step S110).
When the multi-signature function is not used for the transaction data, the determination unit 653 determines that the transaction data does not require the approval of the administrator (step S110: NO). In this case, the determination unit 653 determines that the transaction data satisfies the predetermined completion condition, and extracts it as transaction data to be included in the block data in step S112.
On the other hand, when the multi-signature function is used for the process information, the determination unit 653 determines that the transaction data requires the approval of the administrator (step S110: YES), and proceeds to the next step S111.

Next, when the determination unit 653 determines that the transaction data requires the approval of the administrator (step S110: YES), the determination unit 653 determines whether or not the transaction data includes the signature (approval) of the administrator. (Step S111).
When the transaction data does not include the signature of the administrator (step S111: NO), the determination unit 653 determines that the process information (unapproved process information) included in the transaction data does not satisfy the predetermined completion condition. To do. In this case, step S112 is skipped and the process proceeds to step S113. That is, the transaction data including the unapproved process information is not extracted as the transaction data for creating the block data, and is held in the storage unit 62 as unprocessed.
On the other hand, when the transaction data includes the signature of the administrator (step S111: YES), the determination unit 653 satisfies the predetermined completion condition for the process condition (approved process information) included in the transaction data. Is determined, and the process proceeds to the next step S112.

Next, when the block creation unit 652 determines that the process information satisfies the predetermined completion condition by the determination unit 653 (step S110: NO or step S111: YES), the block creation unit 652 selects the transaction data including the process information. , Extract as transaction data for creating block data (step S112).
Further, the block creation unit 652 determines whether or not the extraction of all transaction data stored in the storage unit 62 is completed (step S113). If the block creation unit 652 has not completed the extraction of all transaction data (step S113: NO), that is, if the storage unit 62 has transaction data that has not been determined by the determination unit 653, the block creation unit 652 returns to step S110. The processing of steps S110 to S112 described above is also executed for other transaction data.
On the other hand, when the block creation unit 652 completes the extraction of all the process information (step S113: YES), the block creation unit 652 proceeds to the next step S114.

Next, the block creation unit 652 creates block data based on the transaction data extracted in step S112 (step S114).

Next, the sharing processing unit 654 shares the block data created by the block creation unit 652 among all the arithmetic units 60, connects the block data and the block data shared in the past in chronological order, and stores the block data. Store in 62 (step S115).
At this time, when a plurality of arithmetic units 60 create block data, the arithmetic unit 60 that created the new block data earliest transfers the new block data to another arithmetic unit 60 and shares the new block data. You may.
The arithmetic unit 60 creates block data and shares it among a plurality of arithmetic units 60 by periodically executing the above processing.

(Hardware configuration of input device and arithmetic unit)
FIG. 5 is a diagram showing an example of the hardware configuration of the input device and the arithmetic unit according to the first embodiment.
Hereinafter, the hardware configuration of the input device 20 and the arithmetic unit 60 according to the present embodiment will be described with reference to FIG.

The computer 900 includes a CPU 901, a main storage device 902, an auxiliary storage device 903, an input / output interface 904, and a communication interface 905.
The input device 20 and the arithmetic unit 60 described above are mounted on different computers 900. The operations of the respective parts of the input device 20 and the arithmetic unit 60 described above are stored in the auxiliary storage device 903 of each computer 900 in the form of a program. The CPU 901 (CPU 25, CPU 65) reads a program from the auxiliary storage device 903, expands it to the main storage device 902, and executes the above processing according to the program. Further, the CPU 901 secures a storage area (storage unit 24, storage unit 62) for storing various information acquired and generated in association with the processing in the main storage device 902 according to the program. Further, the CPU 901 secures a storage area for storing the data being processed in the auxiliary storage device 903 according to the program.
The computer 900 is connected to the external storage device 910 via the input / output interface 904, and the storage area may be secured in the external storage device 910. Further, the computer 900 is connected to the external storage device 920 via the communication interface 905, and the storage area may be reserved in the external storage device 920.

In at least one embodiment, the auxiliary storage device 903 is an example of a non-temporary tangible medium. Other examples of non-temporary tangible media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, etc., which are connected via the input / output interface 904. When this program is distributed to the computer 900 via a communication line, the distributed computer 900 may expand the program to the main storage device 902 and execute the above processing.

Further, the program may be for realizing a part of the above-mentioned functions. Further, the program may be a so-called difference file (difference program) that realizes the above-mentioned function in combination with another program already stored in the auxiliary storage device 903.

(Action effect)
As described above, the process management system 100 according to the present embodiment is a process management system 100 that manages the manufacturing process, and is distributed with each of a plurality of arithmetic devices 60 that store information related to the process management as nodes. It includes a type storage system 6 and an input device 20 that receives input of information related to process management.
The input device 20 is a process of creating process information in which product information for specifying a product is associated with process stages executed for the product by an operator and processing stage information indicating the contents of the process stages. It has an information creation unit 251 and a storage request unit 252 that outputs a storage request for storing process information in the distributed storage system 6.
At least one of the arithmetic units 60 is based on a determination unit 653 that determines whether or not the process information shown in the storage request satisfies a predetermined completion condition, and a process information that the determination unit 653 determines that the completion condition is satisfied. The block creation unit 652 for creating block data and the block data are shared between all the arithmetic units 60, and the block data and the block data shared in the past are connected in chronological order to be stored in the storage unit 62. It has a shared processing unit 654 and a storage unit 654.
By doing so, when the process management system 100 falsifies the process information due to a cyber attack or the like, the block data including the process information to be falsified and the block data created after the block data are combined. Since everything has to be tampered with, the difficulty of tampering can be increased. Therefore, the process management system 100 can improve security by suppressing falsification of process information by increasing the difficulty of falsification in the entire system.
Further, in the above-mentioned process control system 100, since it is not necessary to prepare a management server having high performance and advanced security functions, it is possible to keep the introduction cost of the process control system 100 low.

Further, the determination unit 653 determines that the process information satisfies the completion condition when the process information includes information (signature of the manager) for approving the completion of the process step.
By doing so, the determination unit 653 determines that only the process information approved by the manager satisfies the completion condition for the process stage requiring the approval of the manager. As a result, only transaction data including process information confirmed and approved by the administrator is shared as block data, which suppresses fraud in which the worker reports that the process stage has been completed without the approval of the administrator. be able to.

Further, in the present embodiment, the reception unit 21 of the input device 20 accepts input of product information and processing stage information using an account in which the multi-signature function that requires signatures of both the operator and the administrator is enabled. Do. In this way, the reception unit 21 switches the account and accepts the input of the process information, so that the process information creation unit 251 creates transaction data that requires the signatures of both the worker and the administrator without performing complicated processing. can do.

Further, the reception unit 21 of the input device 20 may accept an operation of reading past process information from the block data stored in the arithmetic unit 60 based on the operation of the operator or the manager. As a result, the process management system 100 can prove that the process control is performed correctly by utilizing the read process information. Further, when a file including a test result is uploaded as process information, the process control system 100 can prove the quality and performance of the product from the test result.

<Second embodiment>
Next, the process control system 100 according to the second embodiment of the present invention will be described with reference to FIGS. 6 to 8.
The components common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 is a diagram showing a functional configuration of the process management system according to the second embodiment.
As shown in FIG. 6, the process management system 100 according to the present embodiment further includes an input device 20 and a database 30 communicably connected to each of the plurality of arithmetic units 60 via a network NW. ..
The process information received by the arithmetic unit 60 together with the storage request from the input device 20 is registered in the database 30.

The CPU 25 of the input device 20 further includes a data requesting unit 253.
The data requesting unit 253 reads out the process information about the product input by the worker and the manager through the receiving unit 21 from the database 30. For example, the data requesting unit 253 may read the process information including the product number and the like input by the worker and the manager via the receiving unit 21 from the database 30 and display it on the display unit 22.

The CPU 65 of the arithmetic unit 60 further includes a hash generation unit 655, a data registration unit 656, and a data verification unit 657.
The hash generation unit 655 calculates the hash value based on the process information determined by the determination unit 653 that the completion condition is satisfied.
Specifically, the hash generation unit 655 generates a transaction ID (hash value) that is a hash of a transaction that includes process information, and also generates a hash value that is a hash of process information. If a file such as a test result is attached to the process information, a hash value of the file may be generated.

Further, in the present embodiment, the block creation unit 652 assigns the transaction ID calculated by the hash generation unit 655 to the process information. Then, the block creation unit 652 creates block data by associating the transaction ID with the hash value of the process information.
In the present embodiment, the block data may include the transaction ID, the process information, and the hash value of the attached file, and even if the process information and the attached file itself are included, they are not included. May be good. When the block creation unit 652 creates block data that does not include the process information and the attached file itself, the capacity of the block data can be reduced accordingly.

The data registration unit 656 associates the process information with the transaction ID of the process information and registers the process information in the database 30.

The data verification unit 657 has the process information registered in the database 30 tampered with based on the hash value of the process information registered in the database 30 and the hash value included in the block data stored in the storage unit 62. Is detected. Further, when the data verification unit 657 detects that the process information has been tampered with, it outputs an abnormality report to each of the input devices 20.

(Processing flow of arithmetic unit)
FIG. 7 is a first processing flow of the arithmetic unit according to the second embodiment.
Hereinafter, the flow of processing in which the arithmetic unit 60 according to the present embodiment shares the block data will be described with reference to FIG. 7.
First, the block creation unit 652 of the arithmetic unit 60 extracts transaction data to be included in the block data from the plurality of process information stored in the storage unit 62 (step S200). At this time, the determination unit 653 and the block creation unit 652 execute the same processing (steps S110 to S112 in FIG. 4) as in the first embodiment described above.

Next, the hash generation unit 655 hashes the process information included in the transaction data extracted in step S200 (step S201).

Next, the hash generation unit 655 generates a transaction ID (hash value) obtained by hashing the transaction of the storage request including the process information, and assigns each of the process information to the process information as a identifiable transaction ID (step S202). ).

Next, the data registration unit 656 associates the process information with the transaction ID of the process information and registers it in the database 30 (step S203).

Next, the block creation unit 652 determines whether or not the extraction of all transaction data stored in the storage unit 62 has been completed (step S204). If the block creation unit 652 has not completed the extraction of all transaction data (step S204: NO), that is, if the storage unit 62 has transaction data that has not been determined by the determination unit 653, the block creation unit 652 returns to step S200. The processing of steps S200 to S203 described above is also executed for other transaction data.
On the other hand, when the block creation unit 652 completes the extraction of all transaction data (step S204: YES), the block creation unit 652 proceeds to the next step S205.

Next, the block creation unit 652 creates block data by associating the transaction ID of the process information with the hash value (step S205).

Next, the sharing processing unit 654 shares the block data created by the block creation unit 652 among all the arithmetic units 60, connects the block data and the block data shared in the past in chronological order, and stores the block data. Store in 62 (step S206).
The arithmetic unit 60 creates block data and shares it among a plurality of arithmetic units 60 by periodically executing the above processing.

FIG. 8 is a second processing flow of the arithmetic unit according to the second embodiment.
Hereinafter, with reference to FIG. 8, the flow of processing in which the data verification unit 657 of the arithmetic unit 60 detects whether or not the process information has been tampered with will be described.
First, the data verification unit 657 of the arithmetic unit 60 acquires the transaction ID of the process information registered in the database 30 (step S210).

Next, the data verification unit 657 extracts the process information from the block data based on the transaction ID, and the hash value of the process information registered in the database 30 and the hash value of the process information stored in the block data are obtained. It is determined whether or not they match (step S211).
When the hash value of the process information registered in the database 30 and the hash value of the process information stored in the block data match (step S211: YES), the data verification unit 657 has falsified the process information. Judge that there is no.
On the other hand, when the hash value of the process information registered in the database 30 and the hash value of the process information stored in the block data do not match (step S211: NO), the data verification unit 657 falsifies the process information. Judge that it has been done. In this case, the data verification unit 657 outputs an abnormality report indicating that the process information has been tampered with to the input device 20 (step S212). At this time, the data verification unit 657 refers to the shop number included in the process information (processing stage information) determined to have been tampered with, and has an abnormality only in the input device 20 provided in the shop indicated by the shop number. The report may be output, or the abnormality report may be output to all the input devices 20. As a result, the workers and managers of shops P1 to Pn can know that the process information has been tampered with.

Next, the data verification unit 657 determines whether or not the detection of the presence or absence of falsification of all the process information registered in the database 30 has been completed (step S213).
When the process information for which the presence or absence of falsification has not been detected remains (step S213: NO), the data verification unit 657 returns to step S210 and repeatedly executes the processes of steps S210 to S212 described above.
On the other hand, when the detection of the presence or absence of falsification of all the process information is completed (step S213: YES), the data verification unit 657 ends the process.
The data verification unit 657 executes a process of detecting whether or not the above-mentioned process information has been tampered with at predetermined intervals (for example, 24 hours).

(Action effect)
As described above, the process management system 100 according to the present embodiment further includes a database 30 for registering process information.
At least one of the arithmetic units 60 registers the hash generation unit 655, which calculates the hash value based on the process information determined by the determination unit 653 to satisfy the completion condition, and the process information and the hash value in the database 30. It further has a data registration unit 656 and a data registration unit 656. The block creation unit 652 creates block data including a hash value.
Since the process information is divided into block data in the arithmetic unit 60, complicated processing is required in the arithmetic unit 60 in order for the operator and the manager to search and extract the desired process information by referring to the block data. There is a possibility that However, in the above aspect, since the process information is registered in the database 30, it is not necessary to prepare a function for searching and extracting the process information in the arithmetic unit 60. Therefore, the development cost of the process control system 100 can be reduced. For example, the data requesting unit 253 of the input device 20 may read the process information about the product input by the operator and the manager via the receiving unit 21 from the database 30 and display it on the display unit 22. As a result, the worker and the manager can search, extract, and browse the desired process information from the database 30 via the input device 20.
Further, in the above-mentioned process control system 100, the worker and the manager can easily read the desired process information from the process information registered in the database 30.

Further, at least one of the arithmetic units 60 falsifies the process information registered in the database 30 based on the hash value registered in the database 30 and the hash value included in the block data stored in the storage unit 62. It also has a data verification unit 657 that detects the presence or absence of.
By doing so, the data verification unit 657 falsifies the process information registered in the database 30 by comparing the hash value of the process information registered in the database 30 with the hash value included in the block data. The presence or absence of is can be easily detected.
Further, since a transaction ID is assigned to each process information registered in the database 30, it is possible to speed up the process of reading the process information from the block data based on the transaction ID.

Further, the block creation unit 652 may create block data that does not include the process information itself. By doing so, the block creation unit 652 can reduce the capacity of the block data. As a result, the process management system 100 can reduce the capacity of the storage unit 62 and reduce the cost required for constructing the system.

Further, the data verification unit 657 refers to the shop number included in the process information (processing stage information) determined to have been tampered with, and reports an abnormality only to the input device 20 provided in the shop indicated by the shop number. May be output, or an abnormality report may be output to all the input devices 20. As a result, the workers and managers of shops P1 to Pn can know that the process information has been tampered with.

<Third embodiment>
Next, the process control system 100 according to the third embodiment of the present invention will be described with reference to FIGS. 9 to 10.
The components common to each of the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 9 is a diagram showing a functional configuration of the process management system according to the third embodiment.
As shown in FIG. 9, the CPU 25 of the input device 20 according to the present embodiment further includes a completion approval unit 254.
Although not shown in FIG. 9, the process control system 100 according to the present embodiment includes the database 30 described in the second embodiment (FIG. 6), the data request unit 253 of the input device 20, and the data request unit 253. It may further have a hash generation unit 655, a data registration unit 656, and a data verification unit 657 of the arithmetic unit 60.

When the storage request unit 252 outputs a storage request for process information (first process information) including a post-process stage (first process stage), the completion approval unit 254 performs a pre-process (second process stage). If the process information (second process information) including the above does not include the information (signature of the administrator) that approves the completion of the previous process, the information (signature) that approves the completion of the previous process. Issue transaction data including.

(Processing flow of input device)
FIG. 10 is a processing flow of the arithmetic unit according to the third embodiment.
Hereinafter, with reference to FIG. 10, the flow of the process in which the input device 20 according to the present embodiment requests the storage of process information will be described.
In the following description, for example, it is assumed that the first step (“cleaning of parts” step) in shop P2 is performed after the final step (“accepting parts” step) in shop P1 is completed.
When the worker of the shop P2 completes the "cleaning of parts" process, the worker inputs the product information including the product number of the product via the reception unit 21. Further, the worker of the shop P2 passes through the reception unit 21 with information indicating the process stage of "cleaning of parts", the shop number (P2) of the shop P1, the signature of the worker, and the part number of the accepted part. And the processing stage information including the information indicating that the cleaning process of the part is completed.
Then, as shown in FIG. 10, the reception unit 21 of the input device 20 receives the input of the product information and the processing stage information based on the operation of the worker of the shop P2 (step S300). Further, the reception unit 21 may accept the input of such information by automatically reading the product information and the processing stage information from the barcode or the like.

Next, the process information creation unit 251 of the input device 20 creates process information in which the product information received by the reception unit 21 in step S300 and the processing stage information are associated with each other (step S301). Further, in the present embodiment, the process information creation unit 251 creates transaction data including the process information and information indicating whether or not the process information satisfies the completion condition, and outputs the transaction data to the storage request unit 252.

Next, the storage request unit 252 of the input device 20 outputs a storage request for storing the transaction data created by the process information creation unit 251 in the distributed storage system 6 (step S302).

Next, the completion approval unit 254 determines whether or not the pre-process of the process stage (“cleaning of parts”) indicated by the process information created in step S301, that is, the “accepting parts” process is in the completed state. (Step S303).
Specifically, the completion approval unit 254 determines whether or not the information indicating the approval of the administrator (signature of the administrator) is input to the transaction data including the process information indicating the "acceptance of parts" process. ..
Here, it is assumed that the process information indicating the "part acceptance process", which is the previous process, is input in the shop P1 using an account in which the multi-signature function that requires the signatures of a plurality of people is enabled. Further, in the present embodiment, when two of the three signatures of the worker and manager of shop P1 and the worker or manager of shop P2 are input, the process is a necessary signature (approval). Is treated as the input transaction data (determined by the determination unit 653 of the arithmetic unit 60 that the completion condition is satisfied).
The completion approval unit 254 searches the transaction data including the process information indicating the previous process from the block data stored in the storage unit 62 of the arithmetic unit 60, and if the transaction data is entered with the signature of the administrator, the previous operation is performed. It is determined that the process is in the completed state (step S303: YES), and the process is terminated.
On the other hand, the completion approval unit 254 determines that the previous process is not in the completed state when the signature of the administrator is not input to the transaction data including the process information of the previous process (step S303: NO), and then next. Step S304 of.

Next, when the manager's signature is not input to the transaction data including the process information indicating "acceptance of parts" which is the previous process, the completion approval unit 254 (step S303: NO), the shop P2 is added to the transaction data. The signature of the worker or administrator, that is, the approval information is input (step S304).

Next, when the approval information is input to the transaction data by the completion approval unit 254, the storage request unit 252 of the input device 20 outputs a storage request for storing the transaction data in the distributed storage system 6 (step). S305).

(Action effect)
As described above, when the storage request unit 252 outputs a storage request for transaction data including the process information indicating the post-process, the completion approval unit 254 signs the process information of the previous process, that is, the previous process. If the information to approve the completion of the process is not included, the signature of the worker or manager of the post-process may be entered to approve the completion of the pre-process.
By doing so, when the approval by the manager is delayed in the previous process, the completion approval unit 254 can approve that the previous process has been completed. As a result, it is possible to prevent the progress of the actual process stage from deviating from the progress of the process stage on the process management system 100 due to the waiting for approval by the manager.

<Fourth Embodiment>
Next, the process control system 100 according to the fourth embodiment of the present invention will be described with reference to FIG.
The components common to each of the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 11 is a diagram showing a functional configuration of the process management system according to the fourth embodiment.
As shown in FIG. 11, the process management system 100 according to the present embodiment further includes an information acquisition system 40.
Although not shown in FIG. 11, the process management system 100 according to the present embodiment includes the database 30 described in the second embodiment (FIG. 6), the hash generation unit 655 of the arithmetic unit 60, and data. It may further have a registration unit 656 and a data verification unit 657, or may further have a completion approval unit 254 of the input device 20 described in the third embodiment (FIG. 9).

The CPU 25 of the input device 20 has a data requesting unit 253.
The data request unit 253 requests the information acquisition system 40 to output the progress information of the manufacturing process based on the search key input by the worker and the manager via the reception unit 21. The search key is, for example, a product number, a part number, a shop number, or a process stage. For example, when a worker and an administrator enter a product number as a search key, the data requesting unit 253 requests the information acquisition system 40 to output progress information of a product related to the product number. The data requesting unit 253 may request the information acquisition system 40 to output progress information related to a plurality of search keys.
Further, the data requesting unit 253 may display the progress information output from the information acquisition system 40 on the display unit 22.

The CPU 65 of the arithmetic unit 60 further has an identifier generation unit 658.
The identifier generation unit 658 generates an identifier indicating the product and the process stage of the process information that the determination unit 653 has determined that the completion condition is satisfied.
The identifier is information that can identify the outline of the process information, and indicates, for example, which product or part executed which process step.
The identifier generation unit 658 generates at least an identifier that can identify the product number, part number, shop number, and process stage. It should be noted that highly confidential information that cannot be disclosed to the outside, such as suppliers, such as detailed execution contents and test results of each process stage, cannot be identified from the identifier.
Further, the identifier generation unit 658 may generate an identifier based on the correspondence table between the process information and the identifier stored in advance in the storage unit 62.

Further, in the present embodiment, the block creation unit 652 assigns the identifier generated by the identifier generation unit 658 to the process information. Then, the block creation unit 652 creates block data including the identifier.

The information acquisition system 40 is a device that is communicably connected to each of the input device 20 and the plurality of arithmetic units 60 via the network NW, and creates progress information indicating the progress of the product process for each product. ..
The information acquisition system 40 includes a communication unit 41, a storage unit 42, and a CPU 45.

The communication unit 41 transmits and receives various information to and from the input device 20 and the arithmetic unit 60 via the network NW.

The storage unit 42 stores in advance a correspondence table between process information (product number, part number, shop number, process stage, etc.) and an identifier.

The CPU 45 has a request reception unit 451 and a progress information creation unit 452.
The request reception unit 451 receives an output request for progress information together with a search key designated from the input device 20, and extracts an identifier associated with the search key.
When the product number is designated as the search key from the input device 20, for example, the request receiving unit 451 includes the designated product number by referring to the correspondence table between the process information and the identifier stored in the storage unit 62. Extract the identifier.

The progress information creation unit 452 creates progress information based on the identifier included in the block data shared in the distributed storage system 6.
Specifically, the progress information creation unit 452 first extracts the process information including the identifier extracted by the request reception unit 451 from the block data stored in the storage unit 62. Then, the progress information creation unit 452 creates progress information based on the process information extracted from the block data color.
The progress information creation unit 452 may create progress information including only an identifier, or may create progress information including process information (product number, part number, shop number, process stage, etc.) that can be identified from the identifier. May be good. When only the identifier is included in the progress information, the correspondence table between the process information and the identifier may be stored in advance in the storage unit 24 of the input device 20.
The progress information creation unit 452 outputs the created progress information to the input device 20 via the communication unit 41.

(Action effect)
As described above, the process management system 100 according to the present embodiment further includes an information acquisition system 40 that creates progress information indicating the progress of the product process for each product.
At least one of the arithmetic units 60 further includes an identifier generation unit 658 that generates an identifier indicating a product of process information and a process stage that the determination unit 653 has determined that the completion condition is satisfied.
The block creation unit 652 creates the block data including the identifier.
The information acquisition system 40 has a progress information creation unit 452 that creates progress information based on an identifier included in the block data shared by the distributed storage system 6 (plurality of arithmetic units 60).
By doing so, the process management system 100 can easily search and extract desired process information from the block data based on the identifier. In addition, the worker and the manager can recognize the progress of the product process for each product by referring to the progress information created based on the identifier.

Further, the progress information creation unit 452 may create progress information including only an identifier, or create progress information including process information (product number, part number, shop number, process stage, etc.) that can be identified from the identifier. You may.
In order to perform more advanced quality control and process control, not only the process executed by the workers of the manufacturing company, but also the process by the parts supplier who delivers the parts to the manufacturing company, the assembly maker who undertakes the assembly, etc. It is necessary to build a manageable management system. If process information can be viewed by a plurality of companies in this way, highly confidential information that cannot be disclosed to other companies, such as detailed execution details of each process stage and test results, may be leaked.
However, in the above-described embodiment, the progress information creation unit 452 creates progress information including only summary information excluding highly confidential information from the process information. Therefore, even in a manufacturing process that spans a plurality of companies, each worker and manager of the plurality of companies can recognize which product executed which process stage based on the progress information, but the progress information Highly confidential information that is not included cannot be viewed. Therefore, the above-mentioned process management system 100 can prevent other companies from knowing highly confidential information.

Although the embodiments of the present invention have been described in detail above, they are not limited to these as long as they do not deviate from the technical idea of the present invention, and some design changes and the like are possible.
For example, in each of the above-described embodiments, an example in which the arithmetic unit 60 is provided in each of the shops P1 to Pn has been described, but the present invention is not limited to this. In another embodiment, a plurality of arithmetic units 60 may be provided as a cloud server at a location different from the shops P1 to Pn.

100 Process control system 20 Input device 21 Reception unit 22 Display unit 23 Communication unit 24 Storage unit 25 CPU
251 Process information creation unit 252 Storage request unit 253 Data request unit 254 Completion approval unit 30 Database 40 Information acquisition system 41 Communication unit 42 Storage unit 45 CPU
451 Request reception unit 452 Progress information creation unit 6 Distributed storage system 60 Arithmetic logic unit 61 Communication unit 62 Storage unit 65 CPU
651 Process information acquisition unit 652 Block creation unit 653 Judgment unit 654 Shared processing unit 655 Hash generation unit 656 Data registration unit 657 Data verification unit 658 Identifier generation unit

Claims (7)

It is a process control system that manages the manufacturing process.
A distributed storage system in which each of a plurality of arithmetic units that store information related to process management is a node,
An input device that accepts input of information related to the process control,
With
The input device is
A process information creation unit that creates process information that associates product information for identifying a product with process stages executed for the product by an operator and processing stage information indicating the contents of the process stages.
A storage request unit that outputs a storage request for storing transaction data including the process information in the distributed storage system, and a storage request unit.
Have,
At least one of the arithmetic units
A determination unit for determining whether or not the process information shown in the storage request satisfies a predetermined completion condition, and a determination unit.
A block creation unit that creates block data based on transaction data including process information that the determination unit determines that the completion condition is satisfied, and a block creation unit.
A sharing processing unit that shares the block data with all the arithmetic units, connects the block data and the block data shared in the past in a time series, and stores the block data in the storage unit.
Have,
Process control system. When the process information includes information for approving the completion of the process step, the determination unit determines that the process information satisfies the completion condition.
The process control system according to claim 1. The input device indicates a second process step which is a pre-process of the first process step when a storage request for transaction data including the first process information indicating the first process step is output. If the transaction data including the process information of 2 does not include the information for approving the completion of the second process step, the transaction data for approving the completion of the second process step is approved.
The process control system according to claim 1 or 2. Further equipped with a database for registering the process information
At least one of the arithmetic units further has a hash generation unit that calculates a hash value based on the process information that the determination unit determines that the completion condition is satisfied.
The block creation unit creates the block data including the hash value.
The process control system according to any one of claims 1 to 3. At least one of the arithmetic units is registered in the database based on the hash value of the process information registered in the database and the hash value included in the block data stored in the storage unit. It also has a data verification unit that detects the presence or absence of falsification of process information.
The process control system according to claim 4. Further equipped with an information acquisition system that creates progress information indicating the progress of the product process for each product.
At least one of the arithmetic units further includes an identifier generation unit that generates an identifier indicating a product and a process stage of process information that the determination unit has determined to satisfy the completion condition.
The block creation unit creates the block data including the identifier, and creates the block data.
The information acquisition system has a progress information creating unit that creates the progress information based on the identifier included in the block data shared in the distributed storage system.
The process control system according to any one of claims 1 to 5. It is a process control method that manages the manufacturing process by a process control system.
The process control system
A distributed storage system that distributes and stores the information by using each of a plurality of arithmetic units that store information related to process management as a node.
An input device that accepts input of information related to the process control,
Have,
The input device is
A process information creation step that creates process information that associates product information for identifying a product with process stages executed for the product by an operator and processing stage information indicating the contents of the process stages.
A storage request step for outputting a storage request for storing transaction data including the process information in the plurality of arithmetic units, and a storage request step.
The execution,
The distributed storage system
A determination step for determining whether or not the process information shown in the storage request satisfies a predetermined completion condition, and
A block creation step for creating block data based on transaction data including process information determined to satisfy the completion condition in the determination step, and a block creation step.
A sharing processing step in which the block data is shared with all the arithmetic units, and the block data and the block data shared in the past are connected in chronological order and stored in the storage unit.
To execute ,
Process control method.

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