WO2016067444A1

WO2016067444A1 - Data management system, computer, data management method and program

Info

Publication number: WO2016067444A1
Application number: PCT/JP2014/079041
Authority: WO
Inventors: 坂倉　隆史
Original assignee: 三菱電機株式会社
Priority date: 2014-10-31
Filing date: 2014-10-31
Publication date: 2016-05-06
Also published as: TW201616364A; JP6099844B2; JPWO2016067444A1

Abstract

A control device (500) is provided with a control management unit (510) which transmits to a computer (200) a first change message (601) indicating that data stored in a control memory (501) has been changed to first data. The computer (200) is provided with: a memory management unit (254) which changes data stored in a computer memory (201) into the first data, on the basis of the first change message (601), and disables an address corresponding to the first data; and an access processing unit (2521) which, if an access to the first data is generated, writes the first data to a cache memory (253), and enables the address.

Description

Data management system, computer, data management method and program

The present invention relates to a data management system, a computer, a data management method, and a program. In particular, the present invention relates to a virtual storage of an operating system, and relates to a data management system, a computer, a data management method, and a program related to FA (Factory Automation) and PA (Process Automation).

Many existing operating systems use a virtual memory mechanism in file read processing or write processing. The virtual memory mechanism allocates a storage area for storing file data to 4KB pages, and implements a file read or write process using the memory access violation trap process implemented in virtual memory. ing. This virtual storage mechanism is hidden from the application programmer, and the application programmer describes file access processing using file I / O API (Application, Programming, Interface).

As described above, in the computer operating system, in the file reading process or writing process, the virtual storage mechanism is used to improve the processing efficiency.
Patent Document 1 discloses a data transfer width, a data transfer delay, and the like of an SRAM (Static, Random, Access, and Memory) and a memory connected to the IC by arranging a repeater in the IC (Integrated Circuit). It is disclosed that data transfer paths are reconfigured for different storage devices to improve processing efficiency.

International Publication No. 2011/0889899

For example, in order to improve processing efficiency in a cloud computing service, it is necessary that the memory change in the control device using the cloud such as FA or PA is reflected in the memory of the computer on the cloud side quickly. It is.
However, in Patent Document 1, only the efficiency of processing is individually achieved in each computer, and the problem that the memory change in the control device using the cloud cannot be quickly reflected in the computer on the cloud side. There is.

In the present invention, by sharing a virtual memory between a control device using the cloud and the computer on the cloud side, the memory change in the control device using the cloud is quickly reflected in the memory of the computer on the cloud side. An object of the present invention is to provide a data management system capable of doing so.

A data management system according to the present invention includes a control device having a control memory, a computer memory, and a computer connected to the control device via a network, wherein the control memory and the computer memory are common. In a data management system in which data is stored,
The controller is
A control management unit for transmitting to the computer a first change message indicating that at least part of the data stored in the control memory has been changed to first data;
The calculator is
With cache memory,
The first change message is received, and at least a part of the data stored in the computer memory is changed to the first data based on the first change message, and an address corresponding to the first data A memory management unit for disabling
An access processing unit that writes the first data into the cache memory and validates an address corresponding to the first data when an access to the first data occurs;

In the data management system according to the present invention, the control management unit of the control device transmits a first change message indicating that the data stored in the control memory is changed to the first data to the computer via the network, The memory management unit of the computer changes the data stored in the computer memory to the first data based on the first change message, invalidates the address corresponding to the first data, and the access processing unit of the computer When the access to the first data occurs, the first data is written to the cache memory and the address corresponding to the first data is validated, so that the memory change in the control device using the cloud can be quickly made in the cloud The effect is that it can be reflected in the memory of the computer on the side.

FIG. 3 is a diagram for explaining an overview of a data management system according to the first embodiment. FIG. 2 is a diagram showing an outline of a system configuration of a computer according to the first embodiment. FIG. 3 is a diagram for explaining the data management system according to the first embodiment. 1 is a block configuration diagram of a data management system according to Embodiment 1. FIG. The data format of the 1st change message and 2nd change message which the control management part and memory management part which concern on Embodiment 1 exchange. 5 is a flowchart showing a first change message transmission process and a memory management process in the data management method according to the first embodiment. 5 is a flowchart showing access exception processing in the data management method according to the first embodiment. FIG. 6 is a block configuration diagram of a data management system 801 according to a second embodiment. 10 is a flowchart showing a data management method of the data management system 801 according to the second embodiment. FIG. 9 is a block configuration diagram of a data management system 803 according to a fourth embodiment. 10 is a flowchart showing computer memory rewriting processing S211 according to the fourth embodiment.

Embodiment 1 FIG.
A data management system 800 and a computer 200 according to the present embodiment will be described with reference to FIGS.

Data center 101 is deployed all over the world. For example, about 30 data centers 101 are deployed all over the world. The data centers 101 are connected by a dedicated line 103. Data in the data center 101 is guaranteed to be consistent in all data centers 101.

The data center 101 is composed of a huge number of computers 200. Each of thousands of rack mount racks, for example, the rack 104, accommodates about 12 blades on which a few CPUs are mounted. The data center 101 accommodates hundreds of thousands to millions of CPUs, and a control plane for distributing communication data, called “merchant silicon”, is interconnected by a switch that can be implemented by software.

The router 105 connects the data center 101 and the user of the data center 101. The router 105 may have a firewall or a VPN (Virtual Private Network) router function from the viewpoint of security.

The gateway device 106 is a device that connects a network in a factory to the data center 101.
A PLC 107 (Programmable / Logic / Controller) is connected to a network in the factory via a gateway device 106. The network in the factory includes a plurality of proprietary networks. The PLC 107 is also connected to these networks, and is connected to the data center 101 via the heterogeneous network and the gateway device 106.

FIG. 2 shows an outline of the system configuration of the computer 200 in the blade accommodated in the rack 104. The computer 200 includes a computer memory 201, a CPU 203, a disk device 205, and a NIC 206 (Network, Interface, Controller).
In the following description, to distinguish between the memory of the computer 200 and the memory of the PLC 107, the memory of the computer 200 is referred to as a computer memory 201, and the memory of the PLC 107 is referred to as a control memory 501.

The computer memory 201 is connected to a controller mounted in a CPU 203 called a north bridge. External I / O devices other than the computer memory 201 are connected to a controller mounted in the CPU 203 called a south bridge. The south bridge includes, for example, a PCI-e 202 (Peripheral Component Interconnect Express), a SATA (Serial Advanced Attachment) 10-Gigabit Ethernet (registered trademark) NIC 206 to which a disk device 205 is connected. A controller group such as PCI-e, GPIO 204 (General, Purpose, Input, Output) to which is connected is mounted.

3, the data management system 800 includes a computer 200 and a PLC 107. The computer 200 and the PLC 107 are connected by a network 600.

As described with reference to FIG. 2, the computer 200 includes a CPU 203, a computer memory 201, a disk device 205, and a NIC 206.
The CPU 203 includes a cache memory 253. The cache memory 253 includes a primary hierarchy cache memory 301, a secondary hierarchy cache memory 302, and a tertiary hierarchy cache memory 303.
The disk device 205 is a non-volatile storage device in which a mapped file 2052 is stored.

A control memory 501 and a NIC 506 are connected to the PLC 107. Note that the PLC 107 may include the control memory 501 and the NIC 506.
The computer 200 and the PLC 107 are connected by a network 600 such as an IP (Internet Protocol) network via the NIC 206 and the NIC 506.

The primary hierarchy cache memory 301 is a primary cache memory in which an object operated by the CPU core is stored, and is also referred to as an L1 cache memory. The storage area 3011 is an area for storing the synchronization state / attribute information of the primary hierarchy cache memory 301.
The secondary tier cache memory 302 is a secondary cache memory that is a first back store, and is also referred to as an L2 cache memory. The storage area 3021 is an area for storing the synchronization state / attribute information of the secondary hierarchy cache memory 302.
The tertiary hierarchy cache memory 303 is a tertiary cache memory that is a second back store, and is also referred to as an L3 cache memory. The storage area 3031 is an area for storing synchronization state / attribute information of the tertiary hierarchy cache memory 303.

The computer memory 201 is a third back store. The storage area 2011 is an area for storing the synchronization state / attribute information of the computer memory 201. The computer memory 201 is, for example, a DRAM (Dynamic, Random, Access, Memory) called DDR4 (Double, Data, Rate4).

The disk device 205 functions as a fourth back store. A storage area 2051 is a storage area for synchronization state / attribute information of the disk device 205.

The control memory 501 of the PLC 107 is a fifth back store. The storage area 5011 is an area for storing synchronization state / attribute information of the control memory 501 of the PLC 107. The control memory 501 is a DRAM called DDR3 (Double / Data / Rate 3), for example.

Here, a memory using the computer memory 201 as an example will be described.

Operating system virtual storage is a system in which virtual addresses are allocated and managed in a memory area of a memory such as DRAM, which is a valuable resource of the system. When memory and storage devices such as magnetic disk storage devices that are non-volatile storage are mapped in units of pages of 4 KB units and cannot be accommodated on the memory, a memory area is virtually allocated and accommodated using the storage device as an auxiliary storage device Export pages that cannot.

By using the storage device in a complementary manner with limited memory resources, the virtual memory gives a virtual large memory area to the execution program. Virtual memory releases all pages used by lower-order processes according to the working set and process priority, which keeps the number of pages used by processes constant, in order to use memory more efficiently. It has been implemented with policies such as a method and a method of releasing pages that are not frequently used.

However, with advances in IC manufacturing process technology, IC miniaturization and multilayering have advanced. When a memory called DDR4 is fully mounted on a DIMM (Dual, Inline, Memory, Module), the capacity of the DDR4 reaches 1 TB. The capacity of 1 TB is a memory capacity that cannot possibly be consumed by the current operating system or application execution. Therefore, a storage device for saving pages that cannot be accommodated becomes unnecessary, and in many cases, the memory is positioned only as a storage area that can be accessed at high speed. The memory area reserved by the application program is released as it is. Therefore, by using DDR4 as the computer memory 201 that is the third back store, the processing speed of the computer 200 is improved.

However, the use of memory is not limited to a program execution area. The operating system uses a virtual storage mechanism in file read processing or write processing. In the virtual storage mechanism, as described above, a storage area in which file data is stored is allocated to 4 KB pages, and a file access process or a memory access violation trap process implemented in the virtual storage is used. Write processing is realized. This virtual memory mechanism is hidden from the application programmer, and the application programmer describes the file access processing using the file I / O API.

Next, a block configuration of the data management system 800 that shares the computer memory 201 in the computer 200 and the control memory 501 of the PLC 107 via the network 600 will be described with reference to FIG.

*** Explanation of configuration ***
First, the main configuration and functions of the data management system 800 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 4, the data management system 800 includes a control device 500 having a control memory 501 and a computer 200 having a computer memory 201 and connected to the control device 500 via a network 600.

The control memory 501 and the computer memory 201 store common data. The common data stored in the control memory 501 and the computer memory 201 is, for example, PLC data acquired by the PLC 107. In the data management system 800, the control data 501 and the computer memory 201 are handled as if the memory is shared by mapping the PLC data to the virtual address.

The computer 200 includes an application execution unit 251, an OS execution unit 252, a memory management unit 254, a cache memory 253, and a computer memory 201. The OS execution unit 252 includes an access processing unit 2521.

In addition, the control device 500 has a PLC 107. The PLC 107 includes a control management unit 510 and a control memory 501.

The control management unit 510 transmits a first change message 601 indicating that at least a part of the data stored in the control memory 501 has been changed to the first data 614 to the computer 200. The first data 614 will be described later.
The control management unit 510 includes the first data 614 and the address 613 corresponding to the first data 614 in the first change message 601. The first change message 601 is a message transmitted from the control device 500 to the computer 200. The second change message 602 is a message transmitted from the computer 200 to the control device 500.

The computer 200 includes a cache memory 253.
The memory management unit 254 receives the first change message 601, changes at least a part of the data stored in the computer memory 201 to the first data 614 based on the first change message 601, and the first data The address 613 corresponding to 614 is invalidated. The address 613 corresponding to the first data 614 is set as the first address 613.
That is, the memory management unit 254 receives the first change message 601 including the first data 614 and the first address 613, and based on the received first change message 601, the first address in the computer memory 201 The data corresponding to 613 is changed to the first data 614, and the first address 613 in the computer memory 201 is invalidated.
When access to the first data 614 occurs, the access processing unit 2521 writes the first data 614 to the cache memory 253 and validates the first address 613 corresponding to the first data 614.

The application execution unit 251 executes an application software group.
The OS execution unit 252 executes an operating system including a virtual storage mechanism.
The memory management unit 254 manages a memory in which PLC data is stored. Software that manages the memory like the memory management unit 254 is referred to as a pager. The memory management unit 254 is referred to as a PLC pager, for example.

The control management unit 510 of the PLC 107 performs data management of the PLC 107. The control management unit 510 is also referred to as a PLC data management unit. The control management unit 510 communicates with the memory management unit 254 of the computer 200 and changes data in the control memory 501 of the PLC 107.

Note that the data change performed by the memory management unit 254 and the control management unit 510 includes data reference and data update.

FIG. 5 shows a data format 611 of the first change message and the second change message exchanged between the control management unit 510 and the memory management unit 254 according to the present embodiment.
The control memory 501 of the PLC 107 is mounted on a 16-bit space. In the first 4 bytes of the data format 611, the number of data 612 to be changed in units of 2 bytes is stored.
Thereafter, a combination of an address 613, which is a 16-bit address corresponding to the number of data 612, and 2-byte data 614 corresponding to the address 613 is stored. For example, first data 614 corresponding to the first address 613 is stored, and second data 614 corresponding to the second address 613 is stored.

*** Explanation of operation ***
The first change message transmission process and the memory management process in the data management method according to the present embodiment will be described with reference to FIG.
In the following, corresponding addresses 613 and data 614 are examples of corresponding first addresses 613 and first data 614.
As described above, the data management system 800 includes the control device 500 including the control memory 501, the computer memory 201 and the cache memory 253, and the computer 200 connected to the control device 500 via the network 600. . The control memory 501 and the computer memory 201 store common data, that is, PLC data.

<First Change Message Transmission Processing S110>
In S110, when at least part of the data stored in the control memory 501 is changed to the first data, the control management unit 510 converts the at least part of the data stored in the control memory 501 into the first data. A first change message transmission process for transmitting a first change message 601 indicating that the change has been made to the computer 200 is executed.

This will be described in more detail below.
In S110, when the PLC data change occurs in the control memory 501 of the PLC 107, the control management unit 510 transmits a first change message 601 indicating the change of the PLC data to the memory management unit 254 of the computer 200.
The first change message 601 in S110 is transmitted by UDP (User Datagram Protocol) if the reliability of the layer 2 is high. This is to eliminate the delay time due to 3-Way handshake and window control that occurs in the case of TCP (Transmission, Control, Protocol). Further, in order to secure, the control management unit 510 that manages PLC data and the memory management unit 254 that is a PLC pager may hold a shared secret key in advance and encrypt / decrypt data.

<Memory management process S200>
In S <b> 211 to S <b> 213, the memory management unit 254 of the computer 200 receives the first change message 601 from the control device 500, and first stores at least a part of the data stored in the computer memory 201 based on the first change message 601. And the memory management process for invalidating the address corresponding to the first data is executed.

This will be described in more detail below.
In S211, the memory management unit 254 receives the first change message 601. As described with reference to FIG. 5, the first change message 601 includes an address 613 indicating a change location and data 614 after the change.
In S212, the memory management unit 254 changes data corresponding to the address 613 in the computer memory 201 to data 614 corresponding to the address 613 based on the received first change message 601. That is, the memory management unit 254 rewrites the computer memory 201 with the content of the first change message 601.

In S213, the memory management unit 254 invalidates the address 613 in the computer memory 201. The memory management unit 254 returns to S211 and waits for the first change message 601.

Here, invalidating the address 613 in the computer memory 201 means invalidating the page table entry of the page including the data 614. The page table is generated immediately after the data management system 800 starts operation. The page table is data managed by the kernel of the operating system, and is composed of data called page table entries that constitute a page table that is about twice as large as the physical memory.

The access exception process S220 in the memory management method according to this embodiment will be described with reference to FIG.

<Access exception processing S220>
In steps S221 to S223, when access to the data 614 occurs, the access processing unit 2521 of the OS execution unit 252 performs access exception processing that writes the data 614 to the cache memory 253 and validates the address 613 corresponding to the data 614. Execute.

This will be described in more detail below.
In S221, when the CPU 203 of the computer 200 accesses the virtual address defined in the page table entry, if the page table entry to be accessed is invalidated, the MMU (Memory / Management / Unit) performs the memory access exception process. generate. That is, when the CPU 203 accesses the address 613 corresponding to the data 614, the page table entry corresponding to the address 613 is invalidated, so that the MMU generates a memory access exception process. The memory access exception process is a process defined in the operating system.
The access processing unit 2521 of the OS execution unit 252 executes memory access exception processing.

In S222, the access processing unit 2521 causes the invalidated page of the computer memory 201 to be read into the multi-layer cache memory 253. That is, the access processing unit 2521 causes the multi-layer cache memory 253 to read the data 614 corresponding to the address 613 in the computer memory 201.

In S223, the access processing unit 2521 validates the page table entry of the page including the data 614. By the validation of the page table entry by the access processing unit 2521, the address 613 corresponding to the data 614 in the computer memory 201 is validated.

*** Explanation of effects ***
The virtual storage management method of the computer in the data management system includes a data management software specifying means corresponding to a 4 KB page area of physical memory, and a page table entry management means for storing mapping information to the virtual address of the page area. Have Further, in this virtual storage management method, when data is changed by any of the data management software, the data in the page area is changed and the attribute information of the page table entry is invalidated. In the virtual memory management method, when the CPU accesses the data or cache data of the page with the virtual address, the cache data is updated by generating a data access exception.

As described above, according to the data management system according to the present embodiment, it is possible to cause a change in data generated in the PLC to occur in the memory of the computer and the multi-layer cache memory, and to change the memory on the PLC side immediately. Can be reflected in the memory of the computer and the multi-layer cache memory.

Further, according to the data management system according to the present embodiment, the contents of the computer memory and the contents of the control memory of the PLC can be shared via the network using the control management unit and the memory management unit.
Sharing the computer memory and the control memory of the PLC means that it can be immediately reflected in the processing of the computer application. Therefore, according to the data management system according to the present embodiment, information of a large number of PLC memories, for example, information from sensors and devices provided in a production line and connected to the PLC is collected in a data center called a cloud. it can. According to the data management system according to the present embodiment, information in a large number of PLC control memories can be reflected in a wide variety of processes by applications installed on the cloud.

In the data management system according to the present embodiment, PLC data such as status information on the production facilities of companies deployed globally and the controllers and devices constituting the individual production facilities is stored in a virtual memory area. The data management system according to the present embodiment provides means for flexibly reconfiguring an optimal data coherency maintenance mechanism for status information in consideration of usage requirements for status information, communication delay, and communication data amount.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.
In the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

In this embodiment, a case will be described in which the CPU 203 of the computer 200 changes data to the computer memory 201 managed by the memory management unit 254 that is a PLC pager. According to the data management system 801 according to the present embodiment, the factory control is enabled by the CPU 203 of the computer 200. The data change executed by the CPU 203 includes data reference and data update.

*** Explanation of configuration ***
FIG. 8 is a block configuration diagram of the data management system 801 according to the present embodiment.
A data management system 801 illustrated in FIG. 8 includes a change determination unit 255 in addition to the configuration of the data management system 800 described in the first embodiment. The data management system 801 uses the second change message 602 that is not used in the first embodiment.

When at least a part of data stored in the computer memory 201 is changed to the second data 614, the memory management unit 254 changes at least a part of the data stored in the computer memory 201 to the second data 614. A second change message 602 indicating that this has been done is transmitted to the control device 500.
The control management unit 510 receives the second change message 602 transmitted from the memory management unit 254, and at least part of the data stored in the control memory 501 based on the second change message 602 is converted into the second data 614. change.

When at least a part of the data stored in the computer memory 201 is changed to the second data 614, the change determination unit 255 controls the control memory 501 based on the second address 613 corresponding to the second data 614. It is determined whether or not at least a part of the data stored in is changed to the second data 614.
The memory management unit 254 transmits a second change message 602 to the control device 500 when the change determination unit 255 determines that at least a part of the data stored in the control memory 501 is changed to the second data 614. .

*** Explanation of operation ***
A data management method of the data management system 801 according to the present embodiment will be described with reference to FIG.

In S410, the CPU 203 changes or updates the data in the computer memory 201. For example, the application execution unit 251 of the computer 200 executes an application program that changes or updates PLC data in the computer memory 201. At this time, the data at the second address 613 in the computer memory 201 is changed to the second data 614.

In S411, the change determination unit 255 determines whether or not the change or update of the computer memory 201 is reflected in the control memory 501 of the PLC 107. The change determination unit 255 refers to the memory management data managed by the engineering environment of the PLC 107 and determines whether or not the data update to the PLC 107 is necessary. The change determination unit 255 refers to the memory management data managed by the engineering environment of the PLC 107, determines whether or not the second address is a meaningful address, and whether or not the data update to the PLC 107 is necessary based on the determination result Determine whether.

If the change determination unit 255 determines that data update to the PLC is not necessary, the process ends.
When the change determination unit 255 determines that data update to the PLC is necessary, the process proceeds to S412.

In S412, the change determination unit 255 notifies that the computer memory 201 has been rewritten by the memory management unit 254, which is a PLC pager, with a virtual address, that is, the second address 613. The memory management unit 254 generates a second change message from the second data 614 on the memory corresponding to the virtual address, that is, the second address 613. The memory management unit 254 transmits the generated second change message to the registered IP connection.

In S310, the control management unit 510 receives the second change message 602 transmitted from the memory management unit 254.
In S <b> 311, the control management unit 510 stores data corresponding to the second address 613 in the control memory 501 based on the second address 613 and the second data 614 included in the received second change message 602. Change to second data 614.

When the data in the control memory 501 is changed in the PLC 107, the change in the data in the control memory 501 is reflected in the cache memory of the PLC 107. For example, as with the computer 200, the data in the memory may be reflected in the cache memory.

*** Explanation of effects ***
As described above, according to the data management system according to the present embodiment, when the CPU or the memory management unit changes the page data of the computer memory, the change is reflected in the control memory. Can be controlled.

Further, according to the data management system according to the present embodiment, the change determination unit determines whether or not to reflect the change in the control memory, so the second change message is not transmitted for an unnecessary change. The factory can be efficiently controlled by the CPU of the computer.

Embodiment 3 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.
In the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

*** Explanation of configuration ***
In this embodiment, the data management system 802 includes a plurality of computers 200. That is, the control management unit 510 of the PLC 107 connects to the memory management unit 254 that is the PLC pager of each computer 200 of the plurality of computers 200 via the network 600.

PLC data that is common data is stored in the control memory 501 of the PLC 107 and the computer memory 201 included in each computer 200 of the plurality of computers 200.

*** Explanation of operation ***
In the data management system 802, the control management unit 510 of the PLC 107 is connected to the plurality of memory management units 254, and the PLC data is stored in a plurality of computer memories 201 in a multiplexed manner.
In the data management system 802, when the PLC data of the control memory 501 is changed by the PLC 107, the first change message 601 is transmitted to each of the plurality of memory management units 254, so that the control memory 501 of the PLC 107, Synchronization can be established with the computer memories 201 of the plurality of computers 200.

Further, in the data management system 802, when the PLC data of the computer memory 201 is changed by any of the plurality of memory management units 254, the control memory of the PLC 107 is transmitted by transmitting the second change message 602 to the PLC 107. 501 can be synchronized with each computer memory 201 of the plurality of computers 200.
Note that an exclusive control mechanism between a plurality of PLC pagers does not have to be specially prepared. This is because updating data simultaneously from a plurality of computers does not occur in operation.

*** Explanation of effects ***
As described above, according to the data management system of the present embodiment, two or more data management software, that is, memory management units are mapped to one page area. Therefore, since PLC data can be stored in multiple computer memories in a multiplexed manner, a more secure system can be provided.

Embodiment 4 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.
The same components as those described in Embodiment 1 are denoted by the same reference numerals, and the description thereof may be omitted.

In the data management system 803 according to the present embodiment, a case will be described in which the same physical memory page is doubly mapped to the computer memory 20 and the disk device 205.

*** Explanation of configuration ***
A block configuration diagram of the data management system 803 according to the present embodiment will be described with reference to FIG.
A data management system 803 illustrated in FIG. 10 includes a disk device management unit 256 that is a disk device pager that manages data of the disk device 205 and the disk device 205 in addition to the configuration of the data management system 800 described in the first embodiment. .

The computer 200 includes a disk device 205, and the computer memory 201 and the disk device 205 store PLC data that is common data.

*** Explanation of operation ***
The computer memory rewriting process S212 according to the present embodiment will be described with reference to FIG. The computer memory rewriting process S212 is a process corresponding to the computer memory rewriting process S212 of FIG. The computer memory rewriting process S212 according to the present embodiment includes S212a and S212b.

In S212a, similarly to S212 described in the first embodiment, the memory management unit 254 stores the data corresponding to the first address 613 in the computer memory 201 based on the received first change message 601 in the first The first data 614 corresponding to the address 613 is changed. Further, the memory management unit 254 changes the data of the disk device 205 mapped to the first address 613, which is the same virtual address, to the first data 614 corresponding to the first address 613, so that the disk device pager The contents of the first change message 601 are notified to the disk device management unit 256.

In S212b, the disk device management unit 256 changes the data of the disk device 205 mapped to the first address 613 to the first data 614.

*** Explanation of effects ***
As described above, according to the data management system according to the present embodiment, the same physical memory page is doubly mapped by the memory management unit that is the PLC pager and the disk device management unit that is the disk device pager. Therefore, a system with higher safety can be provided. Further, the computer may include a plurality of disk devices, and the same physical memory page may be mapped to the plurality of disk devices in a multiple manner.

According to the data management system according to the first to fourth embodiments, all of the data stored in the disk device of the computer is synchronized between all the bases of the data center. Therefore, the data on the control memory of the PLC is expanded on the memories of all the data center computers. That is, (1) When the PLC data is updated, the PLC-side memory is updated, and the physical PLC data main body stored in the disk device of the data center is updated. (2) When the memory on the PLC side is updated, a first change message of the memory is transmitted to the data center side, and the memory on the data center side is changed based on the first change message.
Therefore, the application program enables data operation of a specific PLC by memory access at a virtual address, which gives the application programmer very high convenience.

As mentioned above, although embodiment of this invention was described, you may implement in combination of 2 or more among these embodiment. Alternatively, one of these embodiments may be partially implemented. Alternatively, two or more of these embodiments may be partially combined.
The above-described embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applied products, and uses. Can be changed.

101 data center, 103 leased line, 104 rack, 105 router, 106 gateway device, 107 PLC, 200 computer, 201 computer memory, 202 PCI-e, 203 CPU, 204 GPIO, 205 disk device, 206 NIC, 251 application execution unit 252 OS execution unit, 253 cache memory, 254 memory management unit, 255 change determination unit, 256 disk device management unit, 301 primary tier cache memory, 302 secondary tier cache memory, 303 tertiary tier cache memory, 500 control device 501 control memory, 506 NIC, 510 control management unit, 600 network, 601 first change message, 602 second change message, 611 data format Mat, 612 data count, 613 address, 614 data, 800, 801, 802 data management system, 2011, 2051, 3011, 3021, 3031, 5011 storage area, 2052, mapped file, 2521 access processing unit, S210 memory management processing, S220 Access exception handling.

Claims

In a data management system comprising a control device having a control memory and a computer having a computer memory and connected to the control device via a network, wherein the control memory and the computer memory store common data ,
The controller is
A control management unit for transmitting to the computer a first change message indicating that at least part of the data stored in the control memory has been changed to first data;
The calculator is
With cache memory,
The first change message is received, and at least a part of the data stored in the computer memory is changed to the first data based on the first change message, and an address corresponding to the first data A memory management unit for disabling
A data management system comprising: an access processing unit that writes the first data to the cache memory and validates an address corresponding to the first data when access to the first data occurs.
The control management unit
Including the first data and a first address that is an address corresponding to the first data in the first change message;
The memory management unit
The first change message including the first data and the first address is received, and the data corresponding to the first address in the computer memory is received based on the received first change message. 2. The data management system according to claim 1, wherein the data management system is changed to 1 data and the first address in the computer memory is invalidated.
The memory management unit
A second change message indicating that at least part of the data stored in the computer memory has been changed to second data is transmitted to the control device;
The control management unit
2. The second change message transmitted from the memory management unit is received, and at least a part of data stored in the control memory is changed to the second data based on the second change message. 2. The data management system according to 2.
The calculator is
A change determination unit for determining whether to change at least a part of the data stored in the control memory to the second data based on a second address corresponding to the second data;
The memory management unit
The said 2nd change message is transmitted to the said control apparatus, when it determines with the said change determination part changing at least one part of data memorize | stored in the said control memory to the said 2nd data. Data management system.
The data management system includes:
A plurality of the computers;
5. The data management system according to claim 1, wherein the common data is stored in the control memory and the computer memory included in each computer of the plurality of computers. 6.
The computer includes a disk device,
The data management system according to claim 1, wherein the common data is stored in the computer memory and the disk device.
The cache memory is
The data management system according to any one of claims 1 to 6, wherein the data management system is a multi-layer cache memory including at least a primary hierarchy cache memory and a secondary hierarchy cache memory.
The data management system according to any one of claims 1 to 7, wherein the control device includes a programmable logic controller (PLC).
A computer having a computer memory and connected to a control device having a control memory via a network, wherein the control memory and the computer memory store common data.
With cache memory,
Receiving the first change message from the control management unit of the control device, which transmits to the computer a first change message indicating that at least a part of the data stored in the control memory has been changed to the first data; A memory management unit that changes at least a part of the data stored in the computer memory to the first data based on the first change message and invalidates an address corresponding to the first data;
A computer comprising: an access processing unit that writes the first data into the cache memory and validates an address corresponding to the first data when an access to the first data occurs.
A control device having a control memory, a computer memory and a cache memory, comprising a computer connected to the control device via a network, wherein the control memory and the computer memory store common data In the data management method of the data management system,
The control management unit of the control device transmits a first change message indicating that at least a part of data stored in the control memory has been changed to first data to the computer,
The memory management unit of the computer receives the first change message, changes at least a part of data stored in the computer memory to the first data based on the first change message, and Invalidate the address corresponding to 1 data,
A data management method, wherein the access processing unit of the computer writes the first data to the cache memory and validates an address corresponding to the first data when an access to the first data occurs.
A computer having a cache memory and a computer memory, and connected to a control device having a control memory via a network, wherein the control memory and the computer memory are stored in a computer program.
Receiving the first change message from the control device that transmits a first change message indicating that at least a part of the data stored in the control memory has been changed to first data; A memory management process for changing at least a part of the data stored in the computer memory to the first data based on the address and invalidating an address corresponding to the first data;
A program for causing a computer to execute an access exception process for writing the first data to the cache memory and validating an address corresponding to the first data when an access to the first data occurs.