JP2001229136A - Unit and system for control and data transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make efficient the control operation of a control system. SOLUTION: This is a control system 10 equipped with an access destination 17 and further equipped with an access substitute controller 11 which substitutively accesses the access destination 27 and at least, one access request controller 12 which accesses the access destination 17 by using the substitutional access by the access substitute controller 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control apparatus for realizing efficient control of public systems such as a steel plant, a papermaking plant, a water supply and sewage system, and an industrial system used in the automobile industry. And a control system and a data transfer device.

[0002]

2. Description of the Related Art In the case of improving the processing performance of an industrial control device by simultaneously using a plurality of control devices while sharing an input / output device for outputting data to the control target or inputting data from the control target. There is.

FIG. 11 is a block diagram showing a configuration of a conventional control system in which a plurality of control devices share an input / output device.

In this conventional control system 1, the control devices 2 and 3 share an I / O bus 4, and the control devices 2 and 3
3 can arbitrarily access the input / output device 5 via the I / O bus 4. The input / output device 5 collects data from the control target 6 and provides data to the control target.

Each of the control devices 2 and 3 and the input / output device 5
Data memories 7, 8 and an I / O memory 9 are provided for storing / O data (input / output data).

When the input / output device 5 is accessed by the control device 2, the I / O data on the data memory 7 is
It is stored in the I / O memory 9 via the O bus 4 or
I / O data on the O memory 9 is stored in the data memory 7 via the I / O bus 4. As a result, data is transferred between the control device 2 and the control target.

The case where the input / output device 5 is accessed by the control device 3 is the same as the case of the control device 2 described above.
I / O data is transferred between the data memory 8 and the I / O memory 9.

FIG. 12 is a block diagram showing a data transfer state in the conventional control system 1. As shown in FIG.

The I / O memory 9 has an area 9a for the control device 2, an area 9b for the control device 3, and a shared area 9c for both the control devices 2 and 3.

The control device 2 receives the I / O data read from the area 9a for the control device 2 and the shared area 9c, stores the I / O data in the data memory 7, and stores the I / O data in the data memory 7.
The data is transmitted to the area 9a for the control device 2 or the shared area 9
Stored in c.

The control device 3 also transfers data with the input / output device 5 in the same manner as the control device 2 described above.

[0012]

In the above control system, a plurality of control devices can arbitrarily access the input / output device.

However, since there is no restriction on the timing at which each control device accesses the input / output device, each control device accesses the input / output device 5 at an individual timing, and the access is synchronized between the control devices. And it may cause collision.

Also, I / O from a shared input / output device
In a case where a plurality of control devices execute the same control program using data, if the input timing of I / O data by each control device is different, the same control program may use the same I / O data. Even if executed, a case may occur where the control results are not consistent.

For example, if an I / O device updates the contents of I / O data after a certain control device accesses the I / O device, and then another controller accesses the I / O device, the I / O data is updated based on the same I / O data. Even with the same control processing, the consistency of the results is not ensured between the control devices. Such inconsistency in control results is inconvenient when a plurality of control devices execute control in cooperation with each other.

In the conventional control system, when each control device inputs the same I / O data from the same input / output device, it is necessary to input data for the number of control devices. There is a problem that access to the device becomes wasteful. In particular, an I / O access to an input / output device generally requires a time 100 times or more longer than an access to a memory, and an access time is required.

Further, there is a problem that there is no effective method for verifying a control program executed by a control device in a state where a control object and an input / output device are not installed.

When multiplexed control is performed by a plurality of control devices, a special multiplexing control device for transferring data under control between the control devices or switching the control devices is required. There is a problem that the configuration is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to manage access to an access destination and increase the efficiency of control in a control system.

[0020]

Means taken to realize the present invention will be described below.

[0021] The control device of the first invention includes access proxy means for executing access to a shared access destination with another control device by proxy.

In this way, by substituting for access to the shared access destination, access to this access destination can be synchronized between the control devices. Further, since the same data can be used between the control devices, consistency of the control results can be ensured. Furthermore, when a plurality of control devices input the same data from the access destination, the control device of the present invention actually needs to access the access destination only once,
The time required for access can be reduced.

The control device of the second invention is the same as the control device of the first invention, but performs an access proxy when an access proxy is requested to proxy the access.

Therefore, another control device can access necessary data at any time.

According to a third aspect of the present invention, there is provided a control system including an access destination, wherein the access proxy control device performs proxy access to the access destination, and the access proxy control device utilizes the proxy execution of access by the access proxy control device. And at least one access request control device for executing

Thus, access to an access destination shared by a plurality of control devices can be synchronized, and consistency of control results can be ensured. In addition, when the same data is used between the control devices, the access destination needs to be accessed only once, so that the access time can be reduced.

A fourth aspect of the present invention is a control system having an access destination, a shared storage means for storing transmission data transmitted to the access destination and reception data received from the access destination, and receiving data from the access destination. An access proxy control device that receives data by proxy and stores the data in the shared storage means, and transmits the transmission data stored in the shared storage means to the access destination by proxy, and receives the received data stored in the shared storage means, At least one access request control device for storing the transmission data in the shared storage means.

As described above, the data from the access destination and the data to the access destination are stored in the shared storage means, and the access proxy control device manages the storage contents, so that the access between the control devices to the access destination is controlled. Can be synchronized. Also, since data can be shared between control devices,
Consistency of control results can be ensured, and access time when a plurality of control devices require the same data can be reduced.

A fifth aspect of the present invention is a control system having a plurality of access destinations, wherein a shared storage means for storing received data received from the plurality of access destinations, and a control system corresponding to one of the plurality of access destinations. A plurality of control devices for storing received data from the attached access destination in the shared storage means and reading out the received data from the access destination not associated with the access destination from the shared storage means.

As a result, even if the data is from an access destination dedicated to a certain control device, another control device can be used.
The degree of freedom of control increases. For example, it is possible to monitor each other's operations between a plurality of control devices.

A sixth aspect of the present invention is a control system having an access destination, and a shared storage means for storing data, and a shared storage of control data used for control processing based on data received from the access destination. When the service control device to be stored in the means and the service control device fail,
Access to the input / output device by at least one standby control device that reads out the control data stored in the shared storage means and executes the control process, and the service control device and at least one standby control device Switching means for managing the data so that they do not overlap.

Thus, even if one of the plurality of control devices fails, the control data up to that time is stored in the shared storage means, and the other control devices are stored in the shared storage means. The operation of the failed control device can be quickly taken over using the control data that has been set.

Therefore, for example, even if the normal control device fails, the control device can be immediately switched to the standby control device. In this case, since the standby control device can use the latest control data of the service control device, an operation of transferring the control data between the two control devices and constantly updating the content (hereinafter, “tracking”) ) Is not required, and the tracking time, the tracking circuit, and the tracking process can be eliminated.

The seventh invention is a control system similar to the sixth invention, except that the service control device executes the first control program, and at least one standby control device executes the first control program. A second control program that realizes the same control processing as the first control program and operates in parallel with the first control program is executed.

According to the seventh aspect, in addition to the same operation and effect as the control system of the sixth aspect, the same control processing is executed in parallel among a plurality of control units, so that one of the control units fails. However, the control processing can be continued as it is.

According to an eighth aspect of the present invention, there is provided a control system having an access destination, a shared storage means for storing transmission data transmitted to the access destination and reception data received from the access destination, and a shared storage means. And at least one control device for reading the received data stored in the storage device and storing the transmission data in the shared storage device, and a data transfer device for transferring data between the access destination and the shared storage device.

In the eighth aspect, data from a plurality of control devices to an access destination and data from an access destination to a plurality of control devices are temporarily stored in a shared storage means.
Then, the data transfer unit independent of the control device transfers data between the shared storage unit and the access destination.

Thus, a plurality of control devices can be multiplexed, and even if the number of control devices increases or decreases,
Since there is no need to particularly change the access management method, it is possible to easily cope with a change in the number of control devices.

Further, for example, by executing different control programs in parallel in the respective control devices, it is possible to improve the execution speed as compared with a case where different control programs are executed individually.

For example, the same control program can be stored in a plurality of control devices, and any control device can be used as a normal system and another control device can be used as a standby system. If the control program is executed simultaneously with the service control device and the result is stored in the shared storage means, the data transfer means can transfer data from the standby control device even if the service control device fails. What is necessary is just to transfer between and the access destination.

A ninth invention is a data transfer device provided in a control system for storing data in a shared storage device when at least one control device accesses an access destination. Means for transmitting the data to be transmitted to the access destination to the access destination at predetermined intervals or at an arbitrary timing; and accessing the data to be received by one of the at least one control device at predetermined intervals or at an arbitrary timing. Means for receiving from the beginning and storing in the shared storage means.

Thus, a similar effect can be obtained by an operation similar to that of the eighth invention.

[0043]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In this embodiment, a control system will be described in which a specific control device executes data input / output to / from an input / output device to be executed by another control device.

FIG. 1 is a block diagram showing a configuration of a control system according to the present embodiment.

In this control system 10, a control device 11 for access proxy, a control device 12 for access request, and a shared memory 1 accessible from the control devices 11 and 12 are provided.
3 is connected via a microcomputer bus 16. Also,
The control device 11 for access proxy is connected to the input / output device 17 via the I / O bus 4, and only the control device 11 for access proxy can access the input / output device 17.

The shared memory 13 stores the I
Area 13a for I / O data and I / O handled by controller 12
And a data area 13b.

The access proxy control device 11 performs access to the shared input / output device 17 instead of the access request control device 12 at predetermined intervals or when an interrupt signal requesting access is input. An access proxy section 11a for performing proxy execution is provided, and a data memory 14 is provided.

The access request control device 12 includes a data memory 15 and can transmit and receive data to and from the input / output device 17 by utilizing the access execution by the access proxy control device 11. Further, when the access request control device 12 requests access to the input / output device 17, the access request control device 12 outputs an interrupt signal to the access proxy control device 11.

The control devices 11 and 12 share a microcomputer bus 16 and can access a shared memory 13 on the microcomputer bus 16. Each of the control devices 11 and 12 includes a microcomputer and a memory at a central portion.

The input / output device 17 has an I / O memory 18, which is an area 18 for the control device 11.
a, area 18b for control device 12, control devices 11 and 12
And a shared area 18c for both.

FIG. 2 is a block diagram showing a data transfer state executed by control system 10 according to the present embodiment.

In the control system 10, only the access proxy control device 11 directly accesses the input / output device 17.

The control device 11 has its own data memory 14
And the areas 18a, 18a, 1 of the I / O memory 18 of the input / output device 17,
8c is transferred with the I / O data.

The access proxy unit 11 provided in the control device 11
a indicates the I / O received from the area 18a of the I / O memory 18.
O data in the area 1 for the control device 11 on the shared memory 13
8a.

The access proxy section 11a performs the I / O data transfer between the control device 12 and the input / output device 17 by proxy at predetermined intervals in order to execute the transfer.
I / O received from the areas 18b and 18c of the / O memory 18
O data in the area 1 for the control device 12 on the shared memory 13
3b and the I / O data stored in the area 13b on the shared memory 13 is stored in the area 1 of the I / O memory 18.
8b and 18c.

On the other hand, the control device 12
7 does not access the I / O data on the I / O memory 18, but transfers the data between the data memory 15 provided therein and the area 13 b for the control device 12 on the shared memory 13.

Data transfer between the shared memory 13 and the data memory 15 of the control device 12 is executed using the microcomputer bus 16 instead of the I / O bus 4. Therefore,
The controller 1 can access the shared memory at a higher speed than when the controller 12 directly accesses the input / output device 17.

The operation when an interrupt signal is output from the control device 12 to the control device 11 will now be described in detail.

FIG. 3 is a block diagram showing a state of data transfer by an interrupt signal of control system 10 according to the present embodiment.

When requesting access to the input / output device 17 at predetermined intervals or at an arbitrary timing, the access requesting control device 12
For 3c, the access data for reception or transmission, which is data necessary for access, is stored, and an interrupt signal is transmitted to the control device 11 for access proxy.

The access data for reception is transmitted to the control unit 12.
Is the data stored in the specific area 13c when requesting reception of I / O data from the input / output device 17,
It includes data such as an address for reading I / O data from the O memory 18, an access type, and the number of words to be accessed.

On the other hand, the transmission access data is data stored in the specific area 13c when the control device 12 transmits I / O data to the input / output device 17, and includes I / O data, access type, and data. It includes data such as a handshake flag indicating transfer completion.

Upon receiving the interrupt signal, the access proxy section 11a refers to the specific area 13c to determine the type of access.

When the access proxy unit 11a determines that the type of access is data reception, the access proxy unit 11a reads out I / O data on the I / O memory 18 indicated by the access data for reception and stores it in the shared memory 13. . Control device 12
Reads the I / O data stored on the shared memory 13, and the access ends.

On the other hand, if the access proxy unit 11a determines that the access request is for data transmission,
After confirming the completion of the data transfer by the above handshake flag, the I / O data on the shared memory 13 is read out,
The data is stored on the I / O memory 18, and the access is completed.

As described above, in the control system 10 according to the present embodiment, a plurality of control devices 11, 1
When the I / O device 2 shares the I / O device 17, only the control device 11 accesses the I / O device 17, and the access of the other control devices 12 is executed by proxy by the control device 11.

Thus, while the same operation as when the input / output device 17 is directly accessed by the control devices 11 and 12 is realized, the access executed by the control devices 11 and 12 to the input / output device 17 is synchronized. Can be done.

The same I / O is used between the control devices 11 and 12.
When the O data is used, the I / O data accessed by the control device 11 can be used by another control device 12 as it is.

As a result, the number of accesses to the input / output device 17 can be reduced, and the data input / output time can be reduced.
In addition, since control processing can be performed between the control devices 11 and 12 using the same I / O data, consistency of control results can be ensured.

In this embodiment, the case where the number of control devices is two has been described as an example. However, the control device 11 for access proxy is one, and the control device 12 for access request is two. The same can be applied to the above, and the same effect can be obtained. In this case, the other control devices 12 other than the control device 11 operate in the same manner as described above.

(Second Embodiment) In the present embodiment, in the control system according to the first embodiment as described above, before the access to the input / output device is actually executed, the control system normally operates. A simulation operation for confirming whether a control operation can be realized will be described.

FIG. 4 is a block diagram showing a state of data transfer by a simulation operation in the present embodiment. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted. Now, only the different parts will be described in detail.

The input / output device 17 is connected to the control system 10 described above.
Is not provided, or the control device 11 and the input / output device 1
When the data transfer is not possible, the control device 12 is used as a so-called simulator instead of the input / output device 17 in order to verify the control program of the control device 11.

When the access proxy unit 1 of the control device 11 enters the simulation mode, the I / O memory 1
Instead of 8, an area 13 a on the shared memory 13 for mapping I / O data for the control device 11 is accessed.

The control device 12 reads out the I / O data of the area 13a on the shared memory 13 stored by the control device 11, and executes a simulation program 12a that simulates the control target 6 using the I / O data. Execute.

The control device 12 stores the simulation data, which is the execution result of the simulation program 12a, in the area 13a on the shared memory 13.

The access proxy section 11a of the control device 11
Simulation data in area 1 on shared memory 13
3a to determine whether the result is appropriate.

By operating as described above, in the control system according to the present embodiment, the control device 11
The simulation of the control program of the control device 11 can be performed even when the control device 11 is not connected to the input / output device 17 in an accessible manner. This makes it possible to determine whether or not the control processing by the control system is appropriate before actually performing control on the control target 6.

In the present embodiment, a case of simulating a single control device has been described as an example, but a similar simulation can be performed for a plurality of control devices.

(Third Embodiment) When the number of input / output devices is large, each control device may have a dedicated input / output device.

In the present embodiment, a control system that realizes efficiency when a plurality of control devices each have a dedicated input / output device will be described.

FIG. 5 is a block diagram showing the configuration of the control system according to the present embodiment.

In the control system 19, the control device 2
0 and 21 and a shared memory 22 are connected to each other via a microcomputer bus 23 so that data can be transferred therebetween.

The control unit 20 is connected to the self-dedicated input / output unit 25 via the I / O bus 24 so as to be able to transfer data. Similarly, the control unit 21 is also connected to the self-dedicated input / output unit 25 via the I / O bus 26. Is connected so that data transfer is possible.

The input / output device 25 is the area 2 for the control device 20.
And an I / O memory 29 including
7 is an I / O memory 31 including an area 30 for the control device 21
Is provided.

The control device 20 stores the I / O data d 1 transferred between the data memory 32 of the control device 20 and the I / O memory 28 of the input / output device 25 in the data memory 32 and the shared memory 22. Further, the control device 20
I / O data transferred between the data memory 33 of the other control device 21 and the I / O memory 31 of the input / output device 27
The / O data d2 is received from the shared memory 22 and stored in the data memory 32.

The control device 21 operates similarly to the control device 20, stores the I / O data d2 in its own data memory 33 and shared memory 22, and stores the I / O data d.
1 is received from the shared memory 22 and stored in the data memory 33.

FIG. 6 is a block diagram showing a state of data transfer executed by control system 19 according to the present embodiment.

In the control system 19, the control device 20 transfers the I / O data d1 between the data memory 32 and the I / O memory 29 of the self-dedicated input / output device 25, and simultaneously transfers the I / O data d1. d1 is also stored on the shared memory 22.

Similarly, the control device 21 stores the data memory 33
The I / O data d2 is transferred between the I / O memory 31 of the self-dedicated input / output device 27 and the I / O data d2 is stored in the shared memory 22 simultaneously with the transfer.

The control device 20 is connected to the other control device 2
The I / O data d2 on the shared memory 22 to which the data has been transferred in step 1 is read as necessary and stored in the data memory 32.

Similarly, the control device 21 controls the other control devices 2
The I / O data d1 on the shared memory 22 to which the data has been transferred at 0 is read as necessary and stored in the data memory 33.

For example, another control device 21 is
The I / O data d2 on the data memory 32 acquired by accessing the shared memory 22 can be used when the monitoring coordination process 34a is executed. Even in the control device 21,
When the monitoring coordination process 34a for the other control device 20 is executed, the I / O data d1 on the data memory 33 can be used.

As described above, in the control system 19 according to the present embodiment, each of the control devices 20 and 21 can access the input / output devices 25 and 27 dedicated to itself at high speed. I / O data handled by the control device can be efficiently acquired.

Further, control can be performed in cooperation with each other while monitoring input / output states managed by other control devices, thereby improving the reliability of control operations of the control devices 20 and 21 in the control system 19. Can be.

The control system 1 according to the present embodiment
In 9, the independence of the control devices 20 and 21 can be ensured. Therefore, even if one control device fails, the other control device can continue the control, and the operation rate of the control system 19 can be improved.

[0098] In the present embodiment, the case where the number of control devices is two has been described as an example, but the present invention can be similarly applied to the case where there are three or more control devices.

(Fourth Embodiment) In the present embodiment, a control system for improving the efficiency of a control operation executed while switching a plurality of control devices accessing an input / output device will be described.

FIG. 7 is a block diagram showing a configuration of a control system according to the present embodiment.

In this control system 35, a control device 36 of a service system and a control device 37 of a standby system are connected to an I / O bus 39 via a switching circuit 38.
Are further connected to an input / output device 40 and a shared memory 41.

The regular control device 36 executes control processing while transferring I / O data between its own data memory 42 and the I / O memory 43 of the input / output device 40.

Further, during the execution of the control process, the control device 36 of the ordinary system appropriately controls the control data used for the control process, such as data (intermediate value of control) obtained during the control process. It is stored in the shared memory 41.

When the control unit 36 of the standby system fails, the control unit 37 of the standby system receives the control data in the shared memory 41 and stores it in its own data memory 44.
Control processing is continued using this control data.

The switching circuit 38 arbitrates the bus right of the I / O bus 39 when there is a normal access to the input / output device 40 and the shared memory 41 from the control devices 36 and 37. 37 has a function of exclusively using the I / O bus 39.

In this control system 35, a plurality of control devices 36 and 37 can access the input / output device 40 and the shared memory 41, and can receive control data of another control device via the shared memory 41. is there.

FIG. 8 is a block diagram showing a data transfer state executed by control system 35 according to the present embodiment.

While the switching circuit 38 gives the bus to the controller 36, the controller 36 of the ordinary system transfers I / O data between the data memory 42 and the I / O memory 43, and The control data is stored in the shared memory 41.

The control device 37 of the standby system is the same as the control device 36, and while the switching circuit 38 gives the bus right, the data memory 44 and the I / O memory 4
3 and transfer control data to the shared memory 41.

Further, in this control system 35, the control device 36 operates as a normal system and the control device 37 operates as a standby system, and the control device 36 stores control data in the shared memory 41 sequentially.

When the service controller 36 fails, the standby control device 37 immediately takes over the control processing executed by the service controller 36 using the control data in the shared memory 41. .

As described above, in the control system 35 according to the present embodiment, since the latest control data of each of the control devices 36 and 37 is stored in the shared memory 41, the data is transferred from the service system to the standby system. The succession of processing can be made more efficient.

The control data is transferred to a plurality of control units 36,
An operation (tracking) for transferring between 37 and updating the contents of control data held by both control devices 36 and 3
Is not required, the time required for the tracking, the tracking circuit, and the like can be omitted.

In the present embodiment, the case where the control device is used as a normal system and a standby system has been described, but the present invention is not limited to this embodiment.

For example, the control programs 36 and 37 may execute the same control program, and a function of synchronizing the programs with a flag stored in the shared memory 41 may be included in the control program. Thereby, the control device 36,
37 can be executed in parallel.

When the control devices 36 and 37 are executed in parallel, the I / O data output from the control devices 36 and 37 to the input / output device 40 is temporarily stored in the shared memory 41, and , 37 may compare the I / O data in the shared memory 41 and output the I / O data to the input / output device 40 only when they match.

As a result, an appropriate I / O
O data can be output. Also, in this case,
The control device that performs the comparison and the output is a control system 3
5 may be added.

Further, in the present embodiment, the case where the number of control devices is two has been described as an example, but the present invention can be similarly applied to the case where there are three or more control devices.

(Fifth Embodiment) In the present embodiment, a control system for collectively executing data transfer between a shared memory accessed by at least one control device and an input / output device will be described. .

FIG. 9 is a block diagram showing a configuration of a control system according to the present embodiment.

In the control system 45, the control device 4
6, 47 are shared memory 48, data transfer circuit 49, I / O
It is connected to an input / output device 51 via an O bus 50.

Control devices 46 and 47 and input / output device 51
Have data memories 52 and 53 and an I / O memory 54, respectively.

The data transfer circuit 49 includes a plurality of control devices 4
The shared memory 48 and the I / O
This is a circuit for collectively transferring data with the O memory 54.

More specifically, this data transfer circuit 49
An input function 49a for storing I / O data on the I / O memory 54 in the shared memory 48 in accordance with designation from the control devices 46 and 47, and an I / O on the shared memory 48 in accordance with designation from the control devices 46 and 47. An output function 49b for storing O data in the I / O memory 54 is included.

For example, a transmission area and a reception area are provided on the shared memory 48, and one of the plurality of control devices 46 and 47 stores I / O data in the transmission area. When the address or the like of the I / O memory 54 is designated, the data transfer circuit 49 stores the I / O data at the designated address of the I / O memory 54.

On the other hand, for example, one of the plurality of control devices 46 and 47 sends the data transfer circuit 49 to the I / O memory 5.
When the address 4 or the like is designated, the data transfer device 49 reads the I / O data stored at the designated address of the I / O memory 54 and stores it in the reception area of the shared memory 48.

Thus, the control devices 46 and 47 can access the input / output device 51 only by accessing the shared memory 48.

FIG. 10 is a block diagram showing a data transfer state executed by control system 45 according to the present embodiment.

In the control system 45, the control device 4
6 and 47 store the I / O data to be transmitted to the input / output device 51 in the shared memory 48, and specify the address of the shared memory 48, the address of the I / O memory 54, and the number of data to the data transfer circuit 49.

Data transfer circuit 49 stores the I / O data in shared memory 48 in I / O memory 54 according to the specified contents.

The data transfer circuit 49 includes the control device 4
The I / O data stored in the specified address of the I / O memory 54 is read from the control device 4 and the
The data is stored in the address of the shared memory 48 designated from 6, 47.

When the I / O data is stored in the designated address of the shared memory 48, the control devices 46 and 47 read the I / O data.

By repeating the above operation, the same operation as in the normal access can be executed. In the control devices 46 and 47 of the control system 45, the same program may be executed in parallel, or different programs may be executed in parallel.

As described above, in the control system 45 according to the present embodiment, since I / O data is transferred between the control devices 46 and 47 and the input / output device 51 via the shared memory 48, Changes in control operations when increasing or decreasing the number of control devices can be reduced. Therefore, it is possible to easily cope with a change in the number of control devices.

By causing a plurality of control devices to execute different programs, the programs can be processed in parallel, and the execution speed can be improved.

The same program is stored in a plurality of control devices, and usually only one of the control devices is operated as a normal system. , The reliability of the control system 45 can be easily improved. Further, in this case, the program is executed in parallel by the standby control device, and the result is stored in the shared memory. And, when the control system of the service system breaks down,
I / O from the shared memory 48 to the data transfer circuit 49
By changing the address designation of data to be output to the memory 54, backup processing can be started early.

In the present embodiment, the case where the number of the control devices is two is described as an example, but the number of the control devices of the control system 45 may be one or more.

Further, in the present embodiment, the control devices 46 and 47 output designation of access to the data transfer circuit 49, but for example, the control devices 46 and 47
May store the specification regarding access in the shared memory 48, and the data transfer circuit 49 may read the specification on the shared memory 48.

In each of the above embodiments, the case where the control device accesses the input / output device is described as an example. For example, instead of the input / output device, the control device, the computer, the database, the communication device, and the like are accessed. Is similarly applicable.

[0140]

According to the present invention as described above, the operation of a control system including a control device and an access destination accessed by the control device can be made more efficient.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a control system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a state of data transfer executed by the control system 10 according to the embodiment.

FIG. 3 is an exemplary block diagram showing a state of data transfer by an interrupt signal of the control system according to the embodiment;

FIG. 4 is a block diagram showing a state of data transfer by a simulation operation according to the second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a control system according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a data transfer state executed by the control system according to the embodiment;

FIG. 7 is a block diagram showing a configuration of a control system according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing a data transfer state executed by the control system according to the embodiment;

FIG. 9 is a block diagram showing a configuration of a control system according to a fifth embodiment of the present invention.

FIG. 10 is an exemplary block diagram showing a data transfer state executed by the control system according to the embodiment;

FIG. 11 is a block diagram showing a configuration of a conventional control system in which a plurality of control devices share an input / output device.

FIG. 12 is a block diagram showing a data transfer state in a conventional control system.

[Explanation of symbols]

1, 10, 19, 35, 45 ... control systems 2, 3, 11, 12, 20, 21, 36, 37, 46,
47 control device 4, 24, 26, 39, 50 I / O bus 5, 17, 25, 27, 40, 51 input / output device 6 controlled object 7, 8, 14, 15, 32, 33, 42 , 44, 52,
53 data memory 9, 18, 29, 31, 43, 54 I / O memory 13, 22, 41, 48 shared memory 38 switching circuit 49 data transfer circuit

Claims (9)

[Claims] 1. A control device comprising an access proxy means for executing access to a shared access destination by proxy for another control device. 2. The control device according to claim 1, wherein the access proxy means executes the access by proxy when the access proxy is requested. 3. A control system having an access destination, comprising: an access proxy control device for performing proxy access to the access destination; and performing access to the access destination using proxy access by the access proxy control device. A control system comprising at least one access request control device. 4. A control system having an access destination, a shared storage means for storing transmission data transmitted to the access destination and reception data received from the access destination, and receiving data from the access destination. An access proxy control device that performs proxy reception, stores the data in the shared storage unit, and transmits the transmission data stored in the shared storage unit to the access destination by proxy, and receives the reception data stored in the shared storage unit And at least one access request control device for storing transmission data in the shared storage means. 5. A control system having a plurality of access destinations, wherein: a shared storage means for storing reception data received from the plurality of access destinations; A plurality of control devices for storing received data from an access destination that is present in the shared storage means and reading out received data from an access destination that is not associated with the shared storage means from the shared storage means. system. 6. In a control system having an access destination, a shared storage means for storing data, and control data used for control processing based on data received from the access destination are stored in the shared storage means. A control device of a service system to perform, and when the control device of the service system fails, at least one control device of a standby system that reads out control data stored in the shared storage unit and executes a control process; A control system, comprising: switching means for managing access to the input / output device by the service control device and the at least one standby control device so as not to overlap. 7. The control system according to claim 6, wherein the service control device executes a first control program, and the at least one standby control device is the same as the first control program. A second control program which realizes the control processing of the first control program and operates in parallel with the first control program. 8. A control system having an access destination, a shared storage unit for storing transmission data transmitted to the access destination and reception data received from the access destination, and a storage unit stored in the shared storage unit. At least one control device for reading out received data, and storing transmission data in the shared storage means; and a data transfer means for transferring data between the access destination and the shared storage means. And control system. 9. A data transfer device provided in a control system that stores data in a shared storage device when at least one control device accesses an access destination, wherein the data transfer device is configured to store the data in the shared storage device. Means for transmitting data to be transmitted to an access destination to the access destination at predetermined intervals or at an arbitrary timing; and data to be received by any of the at least one control device at predetermined intervals or at an arbitrary timing. Means for receiving from said access destination and storing in said shared storage means.