JP2013149024A - Storage system, data management method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage system for use in a control system capable of storing further large amounts of data and further improve the reliability of the storage system.SOLUTION: A secondary storage unit 140 is configured using a storage medium such as a hard disk drive and a solid-state drive, which can store large amounts of data and comes the end of the service life by performing at least any one of data writing and reading. A read/write executing unit 152, on the basis of state information representing the state of a control object 900, reads control data associated with a retrieval key corresponding to the state information and transfers it to a primary storage unit 130. This configuration can reduce the number of times of writing and reading data with respect to the secondary storage unit 140 to elongate the service life of the secondary storage unit 140. In this regard, the reliability of a control system 1 can be improved.

Description

  The present invention relates to a storage system, a data management method, and a program.

In the control of plant equipment and mechanical devices, several techniques for improving reliability by multiplexing storage means have been proposed. For example, in the high-speed dual system control device described in Patent Document 1, each of the main and slave control units has a dual port memory. This dual port memory has its own memory area and other memory area, and one own memory area and the other other memory area are connected by an optical cable, and the data in the own memory area is transferred from the control cycle. Overwrite the other memory area at short intervals.
As a result, the control data of the secondary system memory area can always be held in the control data of the main system, and the control data can be shared substantially in real time.

Japanese Patent Laid-Open No. 2005-50088

When the amount of data used for the control is large, it is conceivable that the data used for the control is stored in a hard disk drive (HDD), which is a relatively inexpensive storage device.
However, the hard disk drive may fail in a relatively short period of time due to wear of moving parts. When a hard disk drive fails, it becomes a factor that causes a reduction in the operating rate of the plant equipment and mechanical devices to be controlled.

  Here, as in the case of duplexing storage means in the high-speed duplex system control device described in Patent Document 1, multiplexing of hard disk drives can improve reliability and, in turn, prevent a reduction in operating rate of the controlled object. it can. However, even in a configuration in which hard disk drives are multiplexed, the hard disk drives may fail at the same time. That is, each hard disk drive may break down as the number of accesses increases, and the failure time of each hard disk drive may coincide.

On the other hand, it is also conceivable to use a solid state drive (SSD), which is a nonvolatile mass storage device using flash memory, as the storage device. However, the solid state drive causes the deterioration of the portion during data writing, and eventually fails. As in the case of a hard disk drive, if a solid state drive fails, it may cause a reduction in the operating rate of the plant equipment and mechanical devices that are controlled.
Also, when multiplexing solid-state drives, the multiplexed solid-state drives may fail at the same time as in the case of hard disk drives.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a more reliable storage system, data management method, and program.

  The present invention has been made to solve the above-described problems. A storage system according to an aspect of the present invention includes an execution system unit and a standby system unit, and the execution system unit includes a primary storage unit, a control unit, and a control unit. A secondary storage unit that stores control data used for target control in association with a search key, a status information acquisition unit that acquires status information indicating the status of a control target, and status information acquired by the status information acquisition unit Based on this, the control data associated with the search key corresponding to the situation information is read and transferred to the primary storage unit, and the control data transfer unit transfers the control data And an instruction information transmitting unit that transmits instruction information for instructing the transfer to the standby system unit. The standby system unit includes a primary storage unit and control data used for control of the control target. A secondary storage unit that stores the information in association with the situation information, and a control data transfer unit that reads the control data from the secondary storage unit according to the instruction information and transfers the control data to the primary storage unit. Features.

  A storage system according to an aspect of the present invention is the storage system described above, wherein the execution system unit includes a write instruction acquisition unit that acquires a data write instruction, and the write instruction acquisition unit performs data writing. When the instruction is acquired, according to the data write instruction, a write execution unit that writes data to the primary storage unit, a read instruction acquisition unit that acquires a data read instruction, and the read instruction acquisition unit acquires a data read instruction In accordance with the data read instruction, data is read from the primary storage unit and the secondary storage unit, and data stored in the primary storage unit is stored for data having different values in the primary storage unit and the secondary storage unit. And a read execution unit that generates a response to the data read instruction.

  The storage system according to an aspect of the present invention is the storage system described above, wherein the execution system unit stores data stored in the primary storage unit when the free capacity of the primary storage unit becomes smaller than a free capacity reference value. To the secondary storage unit to increase the free capacity of the primary storage unit, a remaining life determination unit for determining the remaining life of the secondary storage unit, and a surplus of the secondary storage unit And a free space reference value setting unit that sets the free space reference value to a smaller value when the remaining life determination unit determines that the life is shorter than a predetermined remaining life.

  The storage system according to an aspect of the present invention is the storage system described above, wherein the execution unit and the standby unit each have a free space in the primary storage unit smaller than a free space reference value. A free capacity generation unit that moves the data stored in the primary storage unit to the secondary storage unit to increase the free capacity of the primary storage unit, the free space reference value of the execution system unit, The free space reference value of the standby unit is different from each other.

  In addition, a data management method according to an aspect of the present invention includes an execution system unit including a primary storage unit and a secondary storage unit that stores control data used for control of a control target in association with a search key; A data management method for a storage system, comprising: a storage unit; and a secondary storage unit that stores control data used for control of the control target in association with status information indicating the status of the control target. The status information acquisition step for acquiring status information, and the control associated with the search key corresponding to the status information based on the status information acquired by the execution system unit in the status information acquisition step An execution system unit control data transfer step of reading data and transferring it to the primary storage unit, and the execution system unit in the control data transfer step When the transfer is performed, the instruction information transmission step of transmitting the instruction information instructing the transfer to the standby system unit, the standby system unit reads the control data from the secondary storage unit according to the instruction information, And a standby unit control data transfer step of transferring to the primary storage unit.

  A program according to an aspect of the present invention includes an execution system unit including a primary storage unit, and a secondary storage unit that stores control data used for control of a control target in association with a search key, and a primary storage unit And a secondary storage unit that stores the control data used for control of the control target in association with the status information indicating the status of the control target. A status information acquisition step for acquiring the control data, and the execution system unit reads the control data associated with the search key corresponding to the status information based on the status information acquired in the status information acquisition step. The execution system unit control data transfer step for transferring to the primary storage unit and the execution system unit in the control data transfer step The instruction information transmission step for transmitting the instruction information for instructing the transfer to the standby system unit, the standby system unit reads the control data from the secondary storage unit according to the instruction information, A standby unit control data transfer step for transferring to the primary storage unit.

  According to the present invention, the reliability of the storage system can be further improved.

It is a schematic block diagram which shows the function structure of the control system in one Embodiment of this invention. 4 is a flowchart illustrating a procedure of processing performed by a data management unit 150 in the embodiment. 4 is a flowchart illustrating a procedure in which the data management unit 150 performs processing in response to a data write instruction from the processing unit 120 in the embodiment. 4 is a flowchart illustrating a procedure in which the data management unit 150 performs processing in response to a data read instruction from the processing unit 120 in the embodiment. 4 is a flowchart illustrating a procedure in which the data management unit 150 performs processing related to transfer of a control data set from the secondary storage unit 140 to the primary storage unit 130 in the embodiment. 5 is a flowchart illustrating a procedure in which the data management unit 150 performs a process related to securing the free capacity of the primary storage unit 130 in the embodiment. 4 is a flowchart illustrating a procedure of processing performed by a data management unit 250 in the embodiment. 4 is a flowchart illustrating a procedure of processing performed by a data management unit 150 when the number of times of writing data to the secondary storage unit 140 is reduced in the embodiment. 4 is a flowchart illustrating a procedure in which the data management unit 150 performs processing in response to a data read instruction from the processing unit 120 in the embodiment. 4 is a flowchart illustrating a procedure in which the data management unit 150 performs a process related to movement of a control data set from the secondary storage unit 140 to the primary storage unit 130 in the embodiment. In the same embodiment, it is a schematic block diagram which shows the function structure of a control system in the case of changing the data amount memorize | stored in a primary storage part according to the remaining life of a secondary storage part. 4 is a flowchart illustrating a procedure of processing performed by the data management unit 150 when the amount of data stored in the primary storage unit is changed according to the remaining life of the secondary storage unit in the embodiment. 5 is a flowchart illustrating a procedure in which the data management unit 150 performs processing related to the remaining life management of the secondary storage unit 140 in the embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic block diagram showing a functional configuration of a control system in one embodiment of the present invention. In the figure, a control system (storage system) 1 includes an execution system unit 100, a standby system unit 200, and a network 300, stores data necessary for control of the control object 900, and stores the control object 900. Control. The execution system unit 100 includes a communication unit (instruction information transmission unit) 110, a processing unit 120, a primary storage unit 130, a secondary storage unit 140, and a data management unit 150. The data management unit 150 includes an input / output unit (status information acquisition unit, write instruction acquisition unit, read instruction acquisition unit) 151, and read / write execution unit (control data transfer unit, free capacity generation unit, write execution unit, Read execution unit) 152. The standby unit 200 includes a communication unit 210, a processing unit 220, a primary storage unit 230, a secondary storage unit 240, and a data management unit 250. The data management unit 250 includes an input / output unit 251 and a read / write execution unit (control data transfer unit, free capacity generation unit, write execution unit, read execution unit) 252.

  The control target 900 is a plant or apparatus that is a control target in the control system 1. Although the case where the control object 900 is a gas turbine will be described below, the scope of application of the present invention is not limited to the case where the control object is a gas turbine. The present invention can be applied to various controls involving data storage, and the control target may be various devices, and may be various plants as well as a single device.

  The network 300 is a communication network that connects the control object 900, the execution system unit 100, and the standby system unit 200 to transmit communication signals. As this network 300, various forms of communication networks can be used. For example, the network 300 may be a wireless communication network or a wired network. The network 300 may be a LAN (Local Area Network) or the Internet. In this configuration, the control target 900 and the network 300 are directly connected, but the control target 900 and the network 300 may be connected via an IO processing device (not shown).

  The execution system unit 100 is a unit that stores control data and controls the control object 900. The control data here is data used for controlling the control object 900. For example, in the control data, a state quantity such as temperature or temperature or pressure of each part of the gas turbine, a valve opening degree command or the like output from the execution system unit 100 (processing unit 120) to the control object 900 or the signal is generated. Parameter values for Then, the execution system unit 100 (processing unit 120) calculates a difference between the target value included in the control data and the actual measurement value in the control object 900, and acquires (calculates or controls data) a control command value corresponding to the difference. And output to the control object 900.

  The communication unit 110 communicates with the control object 900 and the standby system unit 200 (communication unit 210) via the network 300. In particular, as will be described later, when the read / write execution unit 152 transfers control data from the secondary storage unit 140 to the primary storage unit 130 (here, copying), the communication unit 110 instructs the transfer to be performed. Information is transmitted to the standby unit 200.

The processing unit 120 controls the control object 900. Specifically, the processing unit 120 is based on the control data stored in the execution system unit 100 (the primary storage unit 130 and the secondary storage unit 140) and the measured value of the state quantity in the control target 900. Is calculated (or read out from the control data stored in the execution system unit 100). Then, the processing unit 120 controls the control target 900 by transmitting the obtained control command to the control target 900 via the communication unit 110 and the network 300.
In addition, the processing unit 120 receives a data read instruction for requesting control data necessary for control of the control target 900 and a data write instruction for instructing saving of control data acquired when controlling the control target 900. To (input / output unit 151). In the following, writing in this apparatus includes additional writing and updating of control data.

  The secondary storage unit 140 is configured using a storage medium such as a hard disk drive that increases the possibility of failure (by reaching the end of its life) by performing at least one of data writing or reading, and retrieves control data as a search key. Are stored in association with each other. Specifically, the storage area of the secondary storage unit 140 is divided into blocks in advance, and for example, a generator output and a temperature as a search key are associated with each block. And the secondary memory | storage part 140 is a control data with respect to a certain generator output and a certain temperature (A series of data required in order for the process part 120 to control the control object 900 at the time of the said generator output and the said temperature. Hereinafter, a series of control data associated with a certain search key is referred to as a “control data set”) and stored in a block associated with the generator output and temperature.

  Here, the association between the search key and the block is stored in, for example, a table format by the read / write execution unit 152. Specifically, the read / write execution unit 152 stores a table in which the generator output, the temperature, and the block address (for example, the head address) are associated with each other. Alternatively, the read / write execution unit 152 may store the function for outputting the address of the block with the generator output and the air temperature as input in advance, for example, by a method other than the table.

  Note that the method for associating the control data set with the search key is not limited to the method for associating the block of the storage area of the secondary storage unit 140 with the search key, and various methods can be used. For example, a folder (directory) may be provided in the storage area of the secondary storage unit 140, and a generator output and an air temperature may be associated with each folder. In this case, the secondary storage unit 140 stores the control data set for a certain generator output and a certain temperature in a folder associated with the generator output and the temperature, thereby associating the control data set with the search key. Add and remember.

  The primary storage unit 130 is configured using a storage medium having a small influence on the possibility of failure in reading and writing data, such as DRAM (Dynamic Random Access Memory) or SRAM (Static Random Access Memory). Remember. Here, the primary storage unit 130 corresponds to an upper storage unit for the secondary storage unit 140 and can be accessed (read and written) at a higher speed than the secondary storage unit 140.

Data management unit 150 writes and reads data to and from primary storage unit 130 and secondary storage unit 140.
The read / write execution unit 152 executes writing and reading of data with respect to the primary storage unit 130 and the secondary storage unit 140. In particular, when the input / output unit 151 acquires a data write instruction, the read / write execution unit 152 writes data in the primary storage unit 130 in accordance with the data write instruction. Further, when the input / output unit 151 obtains a data read instruction, the read / write execution unit 152 reads the corresponding data from the primary storage unit 130 or the secondary storage unit 140 according to the data read instruction, and responds to the data read instruction. Is generated.

  More specifically, when the read / write execution unit 152 acquires the data write instruction output from the processing unit 120 via the input / output unit 151, the read / write execution unit 152 searches for the control data set included in the data write instruction. The key is associated (stored) in the primary storage unit 130. The read / write execution unit 152 stores the control data set in the primary storage unit 130, thereby reducing the number of times the control data set is written to and read from the secondary storage unit 140.

  Further, the read / write execution unit 152 reads a control data set associated with a search key corresponding to the situation information from the secondary storage unit 140 based on the situation information acquired by the input / output unit 151. Transfer to the primary storage unit 130. Here, the status information includes state information of the control target or information indicating the surrounding environment of the control target. Further, the read / write execution unit 152 transfers the control data set requested (read instruction) from the processing unit 120 to the primary storage unit 130 from the secondary storage unit 140 in order to increase the hit rate in the primary storage unit 130. Transfer the control data set.

  Here, what kind of control data set is necessary for control of the control object 900 is specified by the generator output and temperature used as a search key for the control data set. Therefore, the read / write execution unit 152 acquires the latest data on the generator output and the latest data on the temperature as the status information. Then, the read / write execution unit 152 transfers the control data set associated with the obtained generator output and air temperature from the secondary storage unit 140 to the primary storage unit 130 (that is, the secondary storage unit 140). Are read out and written into the primary storage unit 130).

As described above, the read / write execution unit 152 transfers the control data set from the secondary storage unit 140 to the primary storage unit 130 based on the situation information, so that an appropriate control data set (that is, the processing unit 120 is required). Can be stored in the primary storage unit 130 in advance (before instructed by the processing unit 120).
As a result, the read / write execution unit 152 is likely to be able to acquire the control data set by referring to the primary storage unit 130 when the control unit 120 requests the control data set. The number of accesses to the storage unit 140 (here, the number of times the control data set is read from the secondary storage unit 140) can be reduced. By reducing the number of accesses to the secondary storage unit 140, it is possible to suppress wear of the movable parts of the hard disk drive constituting the secondary storage unit 140, thereby extending the life of the hard disk drive. In this respect, the reliability of the control system 1 can be increased, and as a result, the operation rate of the control object 900 and the control system 1 can be improved.
Also, the read / write execution unit 152 stores the control data set in the primary storage unit 130 in advance, so that when the control data set is requested from the processing unit 120, the read / write execution unit 152 quickly reads out and outputs the control data set ( Can be returned).

  Further, the read / write execution unit 152 detects the free capacity of the primary storage unit 130, and when the free capacity of the primary storage unit 130 becomes smaller than the free capacity reference value, the data stored in the primary storage unit 130 is stored in the secondary storage unit. 140 to increase the free capacity of the primary storage unit 130 (that is, the control data set is read from the primary storage unit 130 and written to the corresponding block of the secondary storage unit 140, and the control data set is read out) The storage area of the unit 130 is released (new data can be written)). Of course, if the same control data already exists on the secondary storage unit 140, that is, control data that has not been updated after being transferred from the secondary storage unit 140 to the primary storage unit 130 is not written to the secondary storage unit. It may be discarded.

  Here, the read / write execution unit 152 stores in advance, for example, a constant value such as 10% (percent) of the total storage capacity of the primary storage unit 130 as the free capacity reference value. Then, when the free space in the primary storage unit 130 becomes smaller than the free space reference value, the read / write execution unit 152 determines a control data set that is unlikely to be requested from the processing unit 120, and determines that the control data set is The free space of the primary storage unit 130 is increased by moving to the next storage unit 140.

  At this time, the read / write execution unit 152 determines that a control data set having a longer elapsed time after being written in the primary storage unit 130 is a control data set that is less likely to be requested from the processing unit 120. Alternatively, the distance between each of the search keys (generator output and temperature) stored in the primary storage unit 130 in association with the control data set by the read / write execution unit 152 and the latest data on the generator output and temperature (For example, the Euclidean distance, that is, the value of the square root of the sum of the square of the difference in generator output and the square of the difference in temperature), and the control data set associated with the search key having a larger distance, The determination may be made based on criteria other than the elapsed time since writing, such as determining that the control data set is less likely to be requested from the processing unit 120.

  Further, the read / write execution unit 152 transmits a data write instruction indicating the write performed by the read / write execution unit 152 to the standby unit 200 via the processing unit 120, the communication unit 110, and the network 300. . Further, the read / write execution unit 152 moves the control data set stored in the secondary storage unit 140 to the primary storage unit 130 or moves the control data set stored in the primary storage unit 130 to the secondary storage unit 140. In this case, the read / write execution unit 152 transmits a data read instruction indicating the read performed by itself to the standby unit 200 via the processing unit 120, the communication unit 110, and the network 300. The read / write execution unit 152 transmits the data write instruction and the data read instruction to the standby system unit 200, so that the control data set stored in the execution system unit 100 and the control data set stored in the standby system unit 200 are stored. Are synchronized (tracked).

  Here, the read / write execution unit 152 includes the control data set written by the read / write execution unit 152 itself in the data write instruction and transmits it to the standby unit 200. As a result, regardless of the difference between the timing at which the active system unit 100 stores the control data set and the timing at which the standby system unit 200 stores the control data set, the standby system unit 200 has the same control data set as the active system unit 100. Can be remembered.

  In the following, a case where the read / write execution unit 152 transmits a data read instruction or a data write instruction every time data is read or written will be described. The timing for transmitting the data write instruction is not limited to this. For example, the read / write execution unit 152 may perform time management of transmission timing such as transmitting a data read instruction or a data write instruction at regular intervals.

The input / output unit 151 inputs / outputs data to / from the processing unit 120.
In particular, when the input / output unit 151 acquires a data write instruction including a control data set and a search key from the processing unit 120, the input / output unit 151 outputs the acquired data write instruction to the read / write execution unit 152. Here, the input / output unit 151 may acquire the control data set including the search key, or may acquire the control data set and the search key separately.
In addition, when the input / output unit 151 acquires a data read instruction for instructing reading of the control data set from the processing unit 120, the input / output unit 151 outputs the acquired data read instruction to the read / write execution unit 152.

In addition, the input / output unit 151 uses the control target as data for the read / write execution unit 152 to determine whether or not to transfer the control data set between the primary storage unit 130 and the secondary storage unit 140. Status information indicating the status of 900 is acquired from the processing unit 120 and output to the read / write execution unit 152.
In addition, the input / output unit 151 outputs the data read instruction and the data write instruction output from the read / write execution unit 152 to the communication unit 110 via the processing unit 120 and causes the standby unit 200 to transmit them.

  Standby system unit 200 has a configuration similar to that of execution system unit 100, and control stored in execution system unit 100 in accordance with a data read instruction or data write instruction from execution system unit 100 (read / write execution unit 152). The same control data set as the data set is stored. When a failure occurs in the execution system unit 100, the standby system unit 200 takes over control of the control object 900. In this case, the execution system unit and the standby system unit are switched. That is, the standby system unit 200 becomes a new execution system unit, and the execution system unit 100 becomes a standby system unit.

  The communication unit 210, the processing unit 220, the primary storage unit 230, the secondary storage unit 240, the data management unit 250, the input / output unit 251, and the read / write execution unit 252 in the standby unit 200 are as follows. , Communication unit 110, processing unit 120, primary storage unit 130, secondary storage unit 140, data management unit 150, input / output unit 151, and read / write execution unit 152 in execution system unit 100, respectively. Corresponding to Then, when the execution system unit and the standby system unit are switched, each unit of the standby system unit 200 performs processing with the above-described function for each corresponding part of the execution system unit 100, and each unit of the execution system unit 100 Performs processing with the functions described below for the corresponding units of the standby unit 200.

  The communication unit 210 communicates with the control target 900 and the execution system unit 100 (communication unit 110) via the network 300. In particular, when receiving the instruction information for instructing transfer of the control data set, the communication unit 210 outputs the instruction information to the data management unit 250 via the processing unit 220.

  The processing unit 220 takes over control of the control object 900 from the processing unit 120. For example, in a state where the execution system unit 100 is operating normally, the processing unit 220 is suspended. When a failure occurs in the execution system unit 100 and the execution system unit and the standby system unit are switched, the processing unit 220 controls the control object 900 instead of the processing unit 120.

Similar to the secondary storage unit 140, the secondary storage unit 240 uses a storage medium such as a hard disk drive that increases the possibility of failure (by reaching the end of its life) by at least either writing or reading data. The control data set is stored in association with the search key.
Similar to the primary storage unit 130, the primary storage unit 230 is configured using a storage medium that has a small influence on the possibility of failure of data reading or writing, such as DRAM or SRAM, and stores a control data set. Here, the primary storage unit 230 corresponds to an upper storage unit for the secondary storage unit 240 and can be accessed (read and written) at a higher speed than the secondary storage unit 240.

The data management unit 250 writes and reads data to and from the primary storage unit 230 and the secondary storage unit 240.
The read / write execution unit 252 executes writing and reading of data with respect to the primary storage unit 230 and the secondary storage unit 240. Specifically, read / write execution unit 252 reads and writes data to primary storage unit 230 and secondary storage unit 240 in accordance with the data read instruction and data write instruction output from read / write execution unit 152. I do. When the read / write execution unit 252 reads or writes the data, the control data set stored in the execution system unit 100 and the control data set stored in the standby system unit 200 are synchronized, and the standby system The unit 200 stores the same control data set as the execution system unit 100.

  Note that the read / write execution unit 252 may secure the free capacity of the primary storage unit 230 based on the determination of the read / write execution unit 252 itself. In this case, the read / write execution unit 152 moves the data stored in the primary storage unit 130 to the secondary storage unit 140 to increase the free capacity of the primary storage unit 130, thereby reading data or writing data. Do not send. Then, similarly to the read / write execution unit 152, the read / write execution unit 252 detects the free capacity of the primary storage unit 230, and when the free capacity of the primary storage unit 230 becomes smaller than the free capacity reference value, the primary storage unit The data stored in 230 is moved to the secondary storage unit 240 to increase the free capacity of the primary storage unit 230.

  The read / write execution unit 252 secures the free capacity of the primary storage unit 230 based on the determination of the read / write execution unit 252 itself, and as will be described later, the execution system unit 100 (read / write execution unit 152). And the standby system unit 200 (read / write execution unit 252) perform processing for securing the free capacity of the primary storage unit (primary storage unit 130 or 230), respectively, by using different free space reference values. It can be determined whether or not to do so.

The input / output unit 251 inputs / outputs data to / from the processing unit 220.
In particular, when the input / output unit 251 receives a data read instruction or data write instruction transmitted from the execution system unit 100 (read / write execution unit 152) via the network 300, the communication unit 210, or the processing unit 220, the input / output unit 251 Data read instructions and data write instructions are output to read / write execution unit 252.

In addition, the structure of each part in the control system 1 is not restricted to what is shown in FIG. 1, It can be set as various structures. For example, the number of units included in the control system 1 is not limited to two (the execution system unit 100 and the standby system unit 200) illustrated in FIG. 1 and may be three or more. In this case, any one unit becomes an execution system unit, and another unit becomes a standby system unit.
Each unit included in the control system 1 may be stored in the same casing or may be stored in different casings.

  Further, the processing unit 120 and the data management unit 150 may be stored in the same casing, or may be stored in different casings. Furthermore, the processing unit 120 and the data management unit 150 may be realized using the same CPU (Central Processing Unit). Similarly, the processing unit 220 and the data management unit 250 may be stored in the same casing, or may be stored in different casings. Furthermore, the processing unit 220 and the data management unit 250 may be realized using the same CPU.

Next, the operation of the control system 1 will be described with reference to FIGS.
FIG. 2 is a flowchart showing a procedure of processing performed by the data management unit 150. When the control system 1 is activated and enters an operating state, the data management unit 150 starts the process of FIG.
In the process of FIG. 9, the read / write execution unit 152 first performs a process for a data write instruction from the processing unit 120 (step S101). Next, the read / write execution unit 152 performs a process in response to a data read instruction from the processing unit 120 (step S102). Then, the read / write execution unit 152 performs processing related to the transfer of the control data set from the secondary storage unit 140 to the primary storage unit 130 (step S103). Next, the read / write execution unit 152 performs processing related to securing the free capacity of the primary storage unit 130 (step S104). Then, it returns to step S101.

  The order in which the data management unit 150 (read / write execution unit 152) performs the processes in steps S101 to S104 is not limited to the order shown in FIG. For example, the data management unit 150 may execute the processes in steps S101 to S104 in parallel.

FIG. 3 is a flowchart illustrating a procedure in which the data management unit 150 performs a process in response to a data write instruction from the processing unit 120. The data management unit 150 performs the process of FIG. 3 in step S101 of FIG.
In the process of FIG. 3, the read / write execution unit 152 determines whether the input / output unit 151 has acquired a data write instruction from the processing unit 120 (that is, whether there is a data write instruction output from the processing unit 120). ) Is determined (step S121). If it is determined that the data write instruction has not been acquired (step S121: NO), the processing in FIG.

  On the other hand, when it is determined in step S121 that the data write instruction has been acquired (step S121: YES), the read / write execution unit 152 writes the control data set in the primary storage unit 130 according to the data write instruction. (Step S122). Specifically, when the primary storage unit 130 has already stored the control data set corresponding to the search key included in the data write instruction, the read / write execution unit 152 updates the control data set. If not stored, a new control data set is written.

Then, the read / write execution unit 152 sends a data write instruction for instructing to perform the same writing as the control data set written by the read / write execution unit 152 itself via the processing unit 120. To the standby system unit 200 (step S123). Here, the read / write execution unit 152 causes the standby unit 200 to transmit a data write instruction including the control data set written in the primary storage unit 130 and a search key corresponding to the control data set.
Thereafter, the process returns to step S121.

  Thus, the read / write execution unit 152 first writes the control data set instructed to be written to the primary storage unit 130. Therefore, the control data set stored in the primary storage unit 130 is valid data (a series of appropriately updated data).

FIG. 4 is a flowchart illustrating a procedure in which the data management unit 150 performs a process in response to a data read instruction from the processing unit 120. The data management unit 150 performs the process of FIG. 4 in step S102 of FIG.
In the processing of FIG. 4, the read / write execution unit 152 determines whether the input / output unit 151 has acquired a data read instruction from the processing unit 120 (that is, whether there is a data read instruction output from the processing unit 120). Determination is made (step S141). If it is determined that the data read instruction has not been acquired (step S141: NO), the processing in FIG.

  On the other hand, when it is determined in step S141 that the data read instruction has been acquired (step S141: YES), the read / write execution unit 152 uses the search key included in the data read instruction to store in the primary storage unit 130. The control data set is searched for (step S142), and it is determined whether or not the requested control data set is stored in the primary storage unit 130 (step S143).

When it is determined that the primary storage unit 130 is storing (step S143: YES), the read / write execution unit 152 reads the control data set from the primary storage unit 130 (step S144). Then, the read / write execution unit 152 outputs the obtained control data set to the input / output unit 151 as a response to the data read instruction (step S145). The input / output unit 151 outputs the control data set to the communication unit 110 via the processing unit 120 and causes the standby unit 200 to transmit the control data set.
Thereafter, the process of FIG.

On the other hand, if it is determined in step S143 that primary storage unit 130 does not store the control data set (step S143: NO), read / write execution unit 152 corresponds to the search key included in the data read instruction. The control data set is read from the secondary storage unit 140 (step S151).
Then, the read / write execution unit 152 writes the control data set read from the secondary storage unit 140 in step S151 to the primary storage unit 130 (step S152). In this case, as indicated by the determination result in step S143, primary storage unit 130 does not store the control data set corresponding to the search key included in the data read instruction. Therefore, the read / write execution unit 152 writes the control data set read from the secondary storage unit 140 to the primary storage unit 130 as a new control data set.

Next, the read / write execution unit 152 outputs to the input / output unit 151 an instruction to perform the same copy as the control data set copy performed by the read / write execution unit 152 itself in steps S151 to S152 (step S153). . The input / output unit 151 outputs the instruction to the communication unit 110 via the processing unit 120 and causes the standby unit 200 to transmit the instruction.
For example, the read / write execution unit 152 performs the primary storage of the control data set written in the primary storage unit 130 in step S152 as an instruction to perform the same copy as the copy of the control data set performed by the read / write execution unit 152 itself. A data write instruction for instructing writing to the unit 230 is output to the input / output unit 151. At that time, the read / write execution unit 152 outputs a data write instruction including the control data set and the search key to the input / output unit 151.
Alternatively, the data read instruction that instructs the read / write execution unit 152 to read from the secondary storage unit 240 the same control data set as the control data set read from the secondary storage unit 140 in step S151, and the read control data A data write instruction that instructs to write the set to the primary storage unit 230 may be output to the input / output unit 151.
After step S153, the process proceeds to step S145.

FIG. 5 is a flowchart illustrating a procedure in which the data management unit 150 performs processing relating to transfer of the control data set from the secondary storage unit 140 to the primary storage unit 130. The data management unit 150 performs the process of FIG. 5 in step S103 of FIG.
In the process of FIG. 5, the read / write execution unit 152 acquires the situation information from the control target 900 and calculates the amount of change in the situation in the control target 900 (step S161). For example, the read / write execution unit 152 obtains the latest data of the generator output and the latest data of the temperature, reads the control data set from the secondary storage unit 140 last time, and writes it in the primary storage unit 130. The Euclidean distance between the output and the temperature is calculated as the amount of change.

Then, the read / write execution unit 152 determines whether or not the amount of change calculated in step S161 is equal to or greater than a predetermined threshold (step S162). If it is determined that the amount of change is less than the threshold (step S162: NO), the processing in FIG.
On the other hand, when it is determined that the amount of change is equal to or greater than the threshold (step S162: YES), the read / write execution unit 152 searches the status information (the latest data of the generator output and the latest data of the temperature) acquired in step S161. The control data set is searched for the primary storage unit 130 as a key (step S163), and it is determined whether or not the corresponding control data set is already stored in the primary storage unit 130 (step S164).

When it determines with the primary memory | storage part 130 having already memorize | stored (step S164: YES), the process of the figure is complete | finished.
On the other hand, when the primary storage unit 130 determines that the corresponding control data has not yet been stored (step S164: NO), the read / write execution unit 152 moves the primary storage unit 130 to the secondary storage unit 140. A control data set is selected (step S165). For example, as described above, the read / write execution unit 152 selects the control data set having the longest elapsed time based on the elapsed time since the control data set was written in the primary storage unit 130.

Then, the read / write execution unit 152 reads the control data set selected in step S165 from the primary storage unit 130 together with the associated search key, and stores the storage area in which the control data set and the search key are stored. Release (step S166).
Then, the read / write execution unit 152 writes the control data set read in step S166 to a block corresponding to the search key read in step S166 among the blocks in the storage area of the secondary storage unit 140 (step S167). .

Next, the read / write execution unit 152 reads, from the secondary storage unit 140, the control data set associated with the status information (the latest data of the generator output and the latest data of the temperature) acquired in step S161 ( Step S168).
Then, the read / write execution unit 152 writes the control data set read in step S168 to the primary storage unit 130 as a new control data set (step S169).

Next, the read / write execution unit 152 outputs an instruction to the input / output unit 151 to perform the same transfer as the transfer of the control data set performed by the read / write execution unit 152 in the process of FIG. 5 (step S170). . The input / output unit 151 outputs the instruction to the communication unit 110 via the processing unit 120 and causes the standby unit 200 to transmit the instruction.
For example, the read / write execution unit 152 is similar to the release of the storage area of the primary storage unit 130 performed in step S166 as an instruction to perform the same transfer as the transfer of the control data set performed by the read / write execution unit 152 itself. A release instruction instructing to release the storage area of the primary storage unit 230, a data writing instruction instructing to write the control data set written in the secondary storage unit 140 in step S167 into the secondary storage unit 240, A data write instruction that instructs to write the control data set written in the primary storage unit 130 in step S169 to the primary storage unit 230 is output to the input / output unit 151.
After step S170, the process in FIG.

Note that the read / write execution unit 152 may transfer a plurality of control data sets from the secondary storage unit 140 to the primary storage unit 130. For example, the read / write execution unit 152, in step S168, out of the control data set stored in the secondary storage unit 140, the generator output and temperature associated as search keys, the latest data of the generator output, and A predetermined number of control data sets may be selected in order from the closest distance to the latest temperature data, and the selected control data sets may be written to the primary storage unit 130 in step S169.
The read / write execution unit 152 transfers a plurality of control data sets to the primary storage unit 130 to increase the hit rate in the primary storage unit 130 when the processing unit 120 requests the control data set. Can do.

FIG. 6 is a flowchart illustrating a procedure in which the data management unit 150 performs processing related to securing the free capacity of the primary storage unit 130. The data management unit 150 performs the process of FIG. 6 in step S104 of FIG.
In the process of FIG. 6, the read / write execution unit 152 detects the free space in the primary storage unit 130 (step S181). Then, the read / write execution unit 152 compares the detected free space with a pre-stored free space reference value to determine whether the free space is insufficient (whether the detected free space is less than the free space reference value). Whether or not) is determined (step S182).

If it is determined that the free space is not insufficient (step S182: NO), the processing in FIG.
On the other hand, when it is determined that the free space is insufficient (step S182: YES), the read / write execution unit 152 selects a control data set to be moved from the primary storage unit 130 to the secondary storage unit 140 (step S183). ). For example, as described above, the read / write execution unit 152 determines the amount of free space shortage (free space detection value in descending order of elapsed time based on the elapsed time since the control data set was written in the primary storage unit 130. And a control data set corresponding to the number of free space reference values).

Then, the read / write execution unit 152 reads each of the control data sets selected in step S183 from the primary storage unit 130 together with the search key, and releases the storage area in which the control data set and the search key are stored ( Step S184).
Then, the read / write execution unit 152 writes each of the control data sets read in step S184 to a block corresponding to the search key read in step S184 among the blocks in the storage area of the secondary storage unit 140 (step S184). S185).

Next, the read / write execution unit 152 outputs to the input / output unit 151 an instruction to perform the same processing as the movement of the control data set and the release of the storage area performed by the read / write execution unit 152 in steps S183 to S185. (Step S186). The input / output unit 151 outputs the instruction to the communication unit 110 via the processing unit 120 and causes the standby unit 200 to transmit the instruction.
For example, the read / write execution unit 152 uses the primary storage as an instruction to perform the same process as the read / write execution unit 152 itself, similar to the release of the storage area of the primary storage unit 130 performed in step S184. A release instruction for instructing to release the storage area of the unit 230, and a data write instruction for instructing to write the control data set written in the secondary storage unit 140 in step S185 to the secondary storage unit 240. 151 is output.
After step S186, the process of FIG.

  FIG. 7 is a flowchart illustrating a processing procedure performed by the data management unit 250. When the control system 1 is activated and enters an operating state, the data management unit 250 starts the process of FIG. The data management unit 250 temporarily stores instructions from the data management unit 150 (read / write execution unit 152) in a buffer and processes them in the order in which the instructions are issued.

  In the process of FIG. 7, the read / write execution unit 252 determines whether the input / output unit 251 has acquired the data write instruction to the primary storage unit 230 output from the read / write execution unit 152. (Step S201). When it is determined that the data write instruction has been acquired (step S201: YES), the read / write execution unit 252 writes the control data set in the primary storage unit 230 according to the data write instruction (step S202).

  Next, the read / write execution unit 252 determines whether or not the input / output unit 251 has acquired an instruction to write data to the secondary storage unit 240 output from the read / write execution unit 152 (step). S211). When it is determined that the data write instruction has been acquired (step S211: YES), the read / write execution unit 252 writes the control data set in the secondary storage unit 240 according to the data write instruction (step S212). .

  Next, the read / write execution unit 252 determines whether or not the input / output unit 251 has acquired the data read instruction output from the read / write execution unit 152 from the primary storage unit 230 (step S221). . When it is determined that a data read instruction has been acquired (step S221: YES), the read / write execution unit 252 reads a control data set from the primary storage unit 230 according to the data read instruction (step S222).

  Next, the read / write execution unit 252 determines whether the input / output unit 251 has acquired the data read instruction from the secondary storage unit 240 output from the read / write execution unit 152 (step S231). ). When it is determined that the data read instruction has been acquired (step S231: YES), the read / write execution unit 252 reads the control data set from the secondary storage unit 240 according to the data read instruction (step S232).

Next, the read / write execution unit 252 determines whether or not the input / output unit 251 has acquired an instruction to release the storage area of the primary storage unit 230 output from the read / write execution unit 152 (step S241). ). When it is determined that the release instruction has been acquired (step S241: YES), the read / write execution unit 252 releases the storage area of the primary storage unit 230 according to the release instruction (step S242).
Thereafter, the process returns to step S201.

On the other hand, when the input / output unit 251 determines in step S201 that the corresponding data write instruction has not been acquired (step S201: NO), the process proceeds to step S211.
If it is determined in step S211 that the input / output unit 251 has not acquired the corresponding data write instruction (step S211: NO), the process proceeds to step S221.
If it is determined in step S221 that the input / output unit 251 has not acquired the corresponding data read instruction (step S221: NO), the process proceeds to step S231.
If it is determined in step S231 that the input / output unit 251 has not acquired the corresponding data read instruction (step S231: NO), the process proceeds to step S241.
If the input / output unit 251 determines in step S241 that the release instruction has not been acquired (step S241: NO), the process returns to step S201.

  As described above, the read / write execution unit 152 writes and reads data to and from the primary storage unit 130 based on the status information indicating the status of the control target 900. As a result, the number of times data is written to and read from the secondary storage unit 140 can be reduced, and the life of the secondary storage unit 140 can be extended. In this respect, the reliability of the control system 1 can be increased, and as a result, the stop of the control target 900 due to a failure can be reduced, and the operation rate of the control target 900 and the control system 1 can be improved.

The secondary storage unit 140 and the secondary storage unit 240 may include a solid state drive instead of the hard disk drive. In this case, as described above, a part of the control data set stored in the secondary storage unit 140 is stored in the primary storage unit 130 to reduce the number of times data is written to and read from the secondary storage unit 140. Alternatively, the number of times data is written to the secondary storage unit 140 may be reduced. The solid state drive particularly deteriorates when data is written, and eventually reaches the end of its life. Therefore, the lifetime of the solid state drive can be extended by reducing the number of writes to the solid state drive.
Hereinafter, processing performed by the data management unit 150 when the number of times of writing data to the secondary storage unit 140 is reduced will be described with reference to FIGS.

FIG. 8 is a flowchart illustrating a procedure of processing performed by the data management unit 150 when the number of times of writing data to the secondary storage unit 140 is reduced. The data management unit 150 performs the process of FIG. 8 instead of the process of FIG.
In the process of FIG. 8, step S301 is the same as step S101 of FIG.
After step S301, the read / write execution unit 152 performs processing in response to the data read instruction from the processing unit 120 (step S302). Then, the read / write execution unit 152 performs processing related to the movement of the control data set from the secondary storage unit 140 to the primary storage unit 130 (step S303). Step S304 is the same as step S104 in FIG. After step S304, the process returns to step S301.

  Note that the order in which the data management unit 150 (read / write execution unit 152) performs the processes in steps S301 to S304 is not limited to the order shown in FIG. For example, the data management unit 150 may execute the processes in steps S301 to S304 in parallel.

FIG. 9 is a flowchart illustrating a procedure in which the data management unit 150 performs a process in response to a data read instruction from the processing unit 120. The data management unit 150 performs the process of FIG. 9 in step S202 of FIG.
9, the read / write execution unit 152 determines whether or not the input / output unit 151 has received a data read instruction from the processing unit 120 (that is, whether or not there is a data read instruction output from the processing unit 120). Determination is made (step S321). If it is determined that the data read instruction has not been acquired (step S321: NO), the processing in FIG.

  On the other hand, when it is determined in step S321 that the data read instruction has been acquired (step S321: YES), the read / write execution unit 152 controls the control data set associated with the search key included in the data read instruction. Are read from the secondary storage unit 140 (step S322).

Next, the read / write execution unit 152 searches the primary storage unit 130 for control data using the search key included in the data read instruction, and the primary storage unit 130 stores the corresponding data. If so, the data is read (step S323).
Here, the primary storage unit 130 may store the control data set as a group as described above, but may store the control data in smaller units. For example, the primary storage unit 130 may store one control data set divided into a plurality of pages. For example, when the sampling cycle differs for each control data, the read / write execution unit 152 obtains a data write instruction for each control data, and in step S122 (FIG. 3), the storage area of the primary storage unit 130 Of each page, the page storing the acquired control data may be rewritten.

  Next, the read / write execution unit 152 merges the control data (control data set) read from the secondary storage unit 140 in step S322 and the control data read from the primary storage unit 130 in step S323 (step S324). ). Specifically, the read / write execution unit 152 uses data stored in the primary storage unit 130 as a response to a data read instruction for data having different values in the primary storage unit 130 and the secondary storage unit 140. Generate a control data set. For data stored only in the secondary storage unit 140, data stored in the secondary storage unit 140 is used. On the other hand, any of the control data in which the primary storage unit 130 and the secondary storage unit 140 store the same value may be used. For example, the read / write execution unit 152 uses data read from the primary storage unit 130 in units of pages, and uses data read from the primary storage unit 130 for data included in the read page.

Next, the read / write execution unit 152 outputs the control data set generated in step S325 to the processing unit 120 via the input / output unit 151 as a response to the data read instruction (step S325).
Then, the process of FIG. 9 is complete | finished.

FIG. 10 is a flowchart illustrating a procedure in which the data management unit 150 performs processing related to the movement of the control data set from the secondary storage unit 140 to the primary storage unit 130. The data management unit 150 performs the process of FIG. 10 in step S203 of FIG.
In the process of FIG. 10, steps S341 to S347 are the same as steps S161 to S167 of FIG. However, the read / write execution unit 152 may perform processing in units smaller than the control data set, such as page units in the storage area of the primary storage unit 130.

Further, after step S347, the read / write execution unit 152 outputs an instruction to the input / output unit 151 to perform the same movement as the movement of the control data performed by the read / write execution unit 152 itself in the process of FIG. Step S348). The input / output unit 151 outputs the instruction to the communication unit 110 via the processing unit 120 and causes the standby unit 200 to transmit the instruction.
For example, the read / write execution unit 152 performs the same transfer as the movement of the control data set performed by the read / write execution unit 152 itself, similar to the release of the storage area of the primary storage unit 130 performed in step S346. Next, a release instruction for instructing to release the storage area of the primary storage unit 230 and a data write instruction for instructing to write the control data written in the secondary storage unit 140 in step S347 to the secondary storage unit 240 are input. Output to the output unit 151.
After step S348, the process of FIG.

Here, when the processing of FIG. 10 is compared with the processing of FIG. 5, in FIG. 10, the process of copying the control data stored in the secondary storage unit 140 to the primary storage unit 130 (steps S <b> 168 to S <b> 169 in FIG. 5). Not done. The purpose of this is to reduce the number of times data is written to the secondary storage unit 140 in the process of FIG. 10, and the number of times data is read from the secondary storage unit 140 is not particularly intended to be reduced. Because.
The processing procedure performed by the standby unit 200 is as described with reference to FIG.

  As described above, the read / write execution unit 152 writes the control data instructed to be written by the data write instruction to the primary storage unit 130, and reduces the number of data writes to the secondary storage unit 140. Thereby, the lifetime of the secondary storage unit 140 can be extended. In this respect, the reliability of the control system 1 can be increased, and as a result, the stop of the control target 900 due to a failure can be reduced, and the operation rate of the control target 900 and the control system 1 can be improved.

In addition, when the status of the control target 900 has changed significantly (specifically, when the amount of change is determined to be greater than or equal to the threshold value in step S342 in FIG. 10), the read / write execution unit 152 starts from the processing unit 120. Control data that is unlikely to be requested is moved to the secondary storage unit 140 to release the storage area of the primary storage unit 130, while the control data is copied from the secondary storage unit 140 to the primary storage unit 130 Absent.
By suppressing the copying of control data from the secondary storage unit 140 to the primary storage unit 130, the amount of data transferred between the primary storage unit 130 and the secondary storage unit 140, the execution system unit 100, and the standby system unit The amount of data communication with 200 can be reduced. Thereby, the load of the execution system unit 100 and the standby system unit 200 can be reduced, and the reliability of the control system 1 can be further improved.

The execution system unit 100 (read / write execution unit 152) and the standby system unit 200 (read / write execution unit 252) each secure a free area in the primary storage unit (the process described in FIG. 6). ), And the active system unit 100 and the standby system unit 200 use the free capacity reference values of different values, respectively, and the free capacity of the primary storage unit (primary storage unit 130 or primary storage unit 230). It is also possible to determine whether or not to perform the process of ensuring (step S182 in FIG. 6).
By using different free space reference values for the execution system unit 100 and the standby system unit 200, the number of times data is written to and read from the secondary storage unit 140 is different, and the secondary storage unit 140 and the secondary storage unit 240 is expected to reach the end of life at different timings. Therefore, the possibility that the secondary storage units 140 and 240 may fail at the same time can be reduced, and the reliability of the control system 1 can be further improved.

Note that the data management unit may change the amount of data stored in the primary storage unit according to the remaining life of the secondary storage unit.
FIG. 11 is a schematic block diagram illustrating a functional configuration of the control system when the amount of data stored in the primary storage unit is changed according to the remaining life of the secondary storage unit. In FIG. 1, the control system 1 includes an execution system unit 100, a standby system unit 200, a network 300, and a control object 900. The execution system unit 100 includes a communication unit 110, a processing unit 120, a primary storage unit 130, a secondary storage unit 140, and a data management unit 150. The data management unit 150 includes an input / output unit 151, a read / write execution unit 152, a remaining life determination unit 153, and a free space reference value setting unit 154. The standby unit 200 includes a communication unit 210, a processing unit 220, a primary storage unit 230, a secondary storage unit 240, and a data management unit 250. The data management unit 250 includes an input / output unit 251, a read / write execution unit 252, a remaining life determination unit 253, and a free space reference value setting unit 254.

  In the figure, parts having the same functions corresponding to the parts in FIG. 1 are denoted by the same reference numerals (1, 100, 110, 120, 130, 140, 150 to 152, 200, 210, 220, 230, 240 , 250-252, 300, 900), and the description thereof is omitted. In FIG. 11, in addition to the units shown in FIG. 1, the data management unit 150 further includes a remaining life determination unit 153 and a free space reference value setting unit 154, and the data management unit 250 includes a remaining life determination unit 253. And a free space reference value setting unit 254.

The remaining life determination unit 153 determines the remaining life of the secondary storage unit 140. For example, the secondary storage unit 140 counts and stores the number of data writes and reads performed on the secondary storage unit 140 itself. Then, the remaining life determination unit 153 determines whether the secondary storage unit 140 is based on the difference between the count value and the number of times the data can be read from and written to the secondary storage unit 140 in advance. Detect (calculate) the remaining life of. Then, the remaining life determination unit 153 determines whether or not the detected remaining life is shorter than a predetermined remaining life (remaining life reference value).
When the remaining life determination unit 153 determines that the remaining life of the secondary storage unit 140 is shorter than the predetermined remaining life, the free space reference value setting unit 154 sets the free space reference value to a smaller value.

The remaining life determination unit 253 determines the remaining life of the secondary storage unit 240. For example, the secondary storage unit 240 counts and stores the number of data writes and reads performed on the secondary storage unit 240 itself. Then, the remaining life determination unit 253 determines whether the secondary storage unit 240 is based on the difference between the count value and the number of times the data can be read and written to the secondary storage unit 240 in advance. Detect (calculate) the remaining life of. Then, the remaining life determination unit 253 determines whether or not the detected remaining life is shorter than a predetermined remaining life (remaining life reference value).
When the remaining life determination unit 253 determines that the remaining life of the secondary storage unit 240 is shorter than the predetermined remaining life, the free space reference value setting unit 254 sets the free space reference value to a smaller value.

Next, the operation of the control system 1 will be described with reference to FIGS. 12 and 13.
FIG. 12 is a flowchart illustrating a procedure of processing performed by the data management unit 150 when the amount of data stored in the primary storage unit is changed according to the remaining life of the secondary storage unit. When the control system 1 is activated and enters an operating state, the data management unit 150 starts the process of FIG.
In the process of FIG. 5, the data management unit 150 performs a process related to the remaining life management of the secondary storage unit 140 (step S501). Steps S502 to S505 are the same as steps S101 to S104 in FIG. After step S505, the process returns to step S501.

  Note that the order in which the data management unit 150 performs the processes of steps S501 to S505 is not limited to the order illustrated in FIG. 12, but may be various orders. For example, the data management unit 150 may execute the processes in steps S501 to S505 in parallel.

FIG. 13 is a flowchart illustrating a procedure in which the data management unit 150 performs processing related to management of the remaining life of the secondary storage unit 140. The data management unit 150 performs the process of FIG. 13 in step S501 of FIG.
In the process of FIG. 13, the remaining life determination unit 153 detects (for example, calculates as described above) the remaining life of the secondary storage unit 140 (step S521).

Next, the remaining life determination unit 153 determines whether or not the remaining life of the secondary storage unit 140 detected in step S521 is greater than or equal to the remaining life reference value stored in advance (step S521).
When it is determined that the remaining life reference value is equal to or greater than the remaining life reference value (step S521: YES), the free space reference value setting unit 154 sets a free space reference value for the primary storage unit 130 as a normal free space reference value (for example, 10% or more of the entire storage capacity of the primary storage unit 130 is set to a reference value that secures a free capacity (step S523).
Thereafter, the process of FIG.

  On the other hand, when it is determined in step S521 that the remaining life of the secondary storage unit 140 is less than the remaining life reference value (step S521: NO), the free capacity reference value setting unit 154 determines the free capacity reference for the primary storage unit 130. The value is set to a reference value (for example, a reference value that secures 5% or more of the entire storage capacity of the primary storage unit 130 as a free capacity) with a smaller capacity than normal (step S531).

Further, the remaining life determination unit 153 outputs an alarm warning that the remaining life of the secondary storage unit 140 has become shorter than the remaining life reference to the input / output unit 151 (step S532). For example, the input / output unit 151 outputs the alarm to the alarm panel included in the control system 1 via the processing unit 120, the communication unit 110, and the network 300, and the alarm panel displays the alarm.
After step S532, the process of FIG. 13 ends.

  As described above, when the remaining life determination unit 153 determines that the remaining life of the secondary storage unit 140 is short, the free space reference value setting unit 154 sets the free space reference value of the primary storage unit 130 to be smaller than the normal time. Set to value. As a result, the number of times data is written to and read from the secondary storage unit 140 can be further reduced, and the life of the secondary storage unit 140 can be further extended. In this respect, the reliability of the control system 1 can be increased, and as a result, the stop of the control target 900 due to a failure can be reduced, and the operation rate of the control target 900 and the control system 1 can be improved.

When the remaining life determination unit 153 determines that the remaining life of the secondary storage unit 140 is less than the remaining life reference value, the frequency at which the processing unit 120 outputs a data write request or a data read request is reduced. May be. Thereby, the lifetime of the secondary storage unit 140 can be further extended.
Also in the configuration shown in FIG. 11, the active system unit 100 (read / write execution unit 152) and the standby system unit 200 (read / write execution unit 252) each secure a free space in the primary storage unit. The execution system unit 100 and the standby system unit 200 use the free space reference values having different values so that the free capacity of the primary storage unit (primary storage unit 130 or primary storage unit 230) is used. It may be determined whether or not to perform the process of ensuring.

A program for realizing all or part of the functions of the data management units 150 and 250 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. The processing of each unit may be performed as necessary. Here, the “computer system” includes an OS and hardware such as peripheral devices.
Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Control system 100 Execution system unit 110,210 Communication part 120,220 Processing part 130,120 Primary storage part 140,240 Secondary storage part 150,250 Data management part 151,251 Input / output part 152,252 Read / write execution part 153, 253 Remaining life determination unit 154, 254 Free capacity reference value setting unit 200 Standby system unit 300 Network 900 Control target

Claims (6)

It has an execution system unit and a standby system unit,
The execution system unit is:
A primary storage unit;
A secondary storage unit that stores control data used for control of a control target in association with a search key;
A status information acquisition unit that acquires status information indicating the status of the control target;
Based on the status information acquired by the status information acquisition unit, the control data transfer unit that reads out the control data associated with the search key corresponding to the status information and transfers it to the primary storage unit;
When the control data transfer unit transfers the control data, an instruction information transmission unit that transmits instruction information for instructing the transfer to the standby unit;
Comprising
The standby unit is
A primary storage unit;
A secondary storage unit that stores control data used for control of the control target in association with the situation information;
A control data transfer unit that reads the control data from the secondary storage unit according to the instruction information and transfers the control data to the primary storage unit;
A storage system comprising: The execution system unit is:
A write instruction acquisition unit for acquiring a data write instruction;
When the write instruction acquisition unit acquires a data write instruction, a write execution unit that writes data to the primary storage unit according to the data write instruction;
A read instruction acquisition unit for acquiring a data read instruction;
When the read instruction acquisition unit acquires a data read instruction, data is read from the primary storage unit and the secondary storage unit according to the data read instruction, and the primary storage unit and the secondary storage unit have different values. For data, a read execution unit that generates a response to the data read instruction using data stored in the primary storage unit;
The storage system according to claim 1, further comprising: The execution system unit is:
When the free capacity of the primary storage unit becomes smaller than a free capacity reference value, a free capacity generation unit that moves the data stored in the primary storage unit to the secondary storage unit and increases the free capacity of the primary storage unit;
A remaining life determination unit for determining the remaining life of the secondary storage unit;
When the remaining life determination unit determines that the remaining life of the secondary storage unit is shorter than a predetermined remaining life, a free capacity reference value setting unit that sets the free capacity reference value to a smaller value;
The storage system according to claim 1, further comprising: The execution system unit and the standby system unit are respectively
When the free capacity of the primary storage unit becomes smaller than a free capacity reference value, the free storage capacity generating unit is configured to move the data stored in the primary storage unit to the secondary storage unit and increase the free capacity of the primary storage unit. And
The storage system according to claim 1 or 2, wherein the free capacity reference value of the execution system unit and the free capacity reference value of the standby system unit are different from each other. An execution system unit comprising a primary storage unit, a secondary storage unit that stores control data used for control of a control target in association with a search key, a primary storage unit, and control data used for control of the control target A data management method for a storage system comprising a secondary storage unit that stores information in association with status information indicating a status of a control target,
A status information acquisition step in which the execution system unit acquires status information;
Execution in which the execution system unit reads out the control data associated with the search key corresponding to the situation information based on the situation information acquired in the situation information acquisition step and transfers it to the primary storage unit System unit control data transfer step;
When the execution system unit transfers the control data in the control data transfer step, an instruction information transmission step of transmitting instruction information instructing the transfer to the standby system unit;
The standby unit control data transfer step of reading the control data from the secondary storage unit according to the instruction information and transferring it to the primary storage unit;
A data management method comprising: An execution system unit comprising a primary storage unit, a secondary storage unit that stores control data used for control of a control target in association with a search key, a primary storage unit, and control data used for control of the control target In a computer system as a storage system comprising a secondary storage unit that stores information associated with the status information indicating the status of the control target,
A status information acquisition step in which the execution system unit acquires status information;
Execution in which the execution system unit reads out the control data associated with the search key corresponding to the situation information based on the situation information acquired in the situation information acquisition step and transfers it to the primary storage unit System unit control data transfer step;
When the execution system unit transfers the control data in the control data transfer step, an instruction information transmission step of transmitting instruction information instructing the transfer to the standby system unit;
The standby unit control data transfer step of reading the control data from the secondary storage unit according to the instruction information and transferring it to the primary storage unit;
A program for running

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