JPH0713811A - Decentralized control system - Google Patents

Abstract

PURPOSE:To sends a source program from an individual maintenance tool to a centralized maintenance device without any error. CONSTITUTION:The individual maintenance tool 5 is provided with a means which translates the source program to generate an execution program, confirms whether or not the execution program matches the execution program of a controller 2, and sets coincidence confirmation data 2A2 in the controller 2 and a means which sends the source program to the controller 2. The controller 2 is provided with a means which transfers the source program of the individual maintenance device to the centralized maintenance device 4 on the basis of the coincidence confirmation data 2A2. The centralized maintenance device 4 is provided with a means which receives and stores the source program transferred from the controller 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed control system in which a control device and a maintenance device are connected by a network.

[0002]

2. Description of the Related Art In recent years, in distributed control systems, there has been an increasing demand for centralized management of software for control devices through a network. Further, regarding software editing as well, there has been a demand for creating a control block diagram by translating the execution program from a control block diagram which is edited on a drawing by a large-scale computer, instead of directly editing the execution program.

As a conventional example (1) of this type, FIG. 11 shows a configuration diagram of a distributed control system including a control device and a maintenance device connected by a network.

In FIG. 11, 1 is a higher-level control device, 2 is a plurality of lower-level control devices, 3 is a network connecting these, 4 is a centralized maintenance tool, and 5 is an individual maintenance tool.
The centralized maintenance tool 4 is directly connected to the network 3, and the individual maintenance tools 5 are individually connected to the lower-level control device 2.

The centralized maintenance tool 4 is composed of a large-sized computer or a medium-sized computer having an external storage device. As shown in FIG. 12, 4a is a control program, 4b is an editing program, 4c is a translation program, and 4d is a source program. Four
e is an execution program.

The individual maintenance tool 5 is a small portable device using a microprocessor having an external storage device, and as shown in FIG. 13, 5a is a control program and 5b.
Is an editing program, and 5e is an execution program.

With the above configuration, first, the centralized maintenance tool 4 uses the editing program 4b to
The control block of the control device is edited in the drawing to create the source program 4d. Then, the translation program 4c creates the execution program 4e from the source program 4d. The created execution program 4e is installed in the target lower-level control device 2 via the network 3, and the lower-level control device 2 controls the plant by the execution program.

On the other hand, in the individual maintenance tool 5, the execution program 5e is directly edited using the editing program 5b, mounted on the control device 2 as required, and the control device 2 executes the control of the plant by the execution program. .

By the way, in the case of checking whether the execution program installed in the control device 2 matches the execution program held in the maintenance tool, the individual maintenance tool 5 executes both execution programs. Compare as is. Further, the centralized maintenance tool 4 translates a source program, which stores the screen data of the image drawing held in the centralized maintenance tool 4, into an execution program, and then compares it with the execution program of the control device 2.

Next, as a conventional example (2), the configuration of a distributed control system is shown in FIG.

In the figure, the central maintenance tool 4 is connected to a storage device 4A consisting of a common database 6 and an individual database 7, the control device 2 is connected to an individual maintenance tool 5, and a common database is further provided. A storage device 5A composed of 6 and an individual database 7 is connected. The centralized maintenance tool 4, the control device 2, and the monitoring operation device 10 are connected to the network 3 to perform data transmission.

The control device 2 has an execution program 11, and the execution program 11 controls the plant. The execution program 11 is created by processing 23 the source program 21, the individual database 22, and the common database 6, as shown in FIG.

First, when changing the execution program 11 of the control device 2, the source program 21 is changed and processed to obtain the execution program 11. Individual database 2
2 and the common database 6 are both auxiliary databases when the source program 21 is converted into the execution program 11.

When changing the execution program 11 of the control device 2 using the centralized maintenance tool 4, first, the centralized maintenance tool 4 reads the common database 6 and the individual database 7 from the storage device 4A, and the centralized maintenance tool 4 individually After changing the database 7, an execution program 11 is created from the common database 6 and the individual data 9, and the execution program 11 is sent to the control device 2 through the network 3 to change the execution program 11.

On the other hand, when changing the execution program 11 of the control device 2 using the individual maintenance tool 5, first, the individual maintenance tool 5 reads the common database 6 and the individual data 9 from the storage device 5A, After changing the individual data 9 in 5, an execution program 11 is created from the common database 6 and the individual data 9 and sent to the control device 2 to change the execution program 11.

[0016]

However, the above-mentioned conventional distributed control system has the following various problems.

First, referring to FIG. 11 described as the conventional example (1).
In the distributed control system shown in FIG. 1, originally, the centralized maintenance tool 4 translates the screen data of the image drawing from the original program stored together into the execution program, and then changes the execution program of the control device 2. However, if the centralized maintenance tool 4 is used, it may take time to change the execution program using the individual maintenance tool 5 as necessary. If the program is changed using the individual maintenance tool 5, the individual maintenance tool 5 does not have a source program, so use the centralized maintenance tool 4 to create the changed source program and execution program. I have to. In this case, an execution program having the same function but different function may be created depending on how to write the image drawing. In this case, change using the individual maintenance tool 5 such as changing the way to write the image drawing and re-translating. Creating a source program corresponding to the executed program by the centralized maintenance tool 4 requires a great deal of trouble.

Further, FIG. 1 explained as the conventional example (2).
In the distributed control system corresponding to 4, individual maintenance tools 5
After changing the execution program 11 by the centralized maintenance tool 4, it is necessary to change the execution program 11 by the centralized maintenance tool 4. In this case, the latest individual data 9 is stored in the storage device 5A.
There was a problem in that it had to be moved from the storage device to the storage device 4A by a human system. Further, since the common database 6 is also stored in a plurality of locations in the storage devices 4A and 5A, for example, after changing the common database 6 with the centralized maintenance tool 4, the execution program 11 is executed with the individual maintenance tool 5.
To change the latest common database 6 to the storage device 4
There was a problem that the human system had to move from A to the storage device 5A.

Therefore, an object of the present invention is to provide a distributed control system for efficiently managing a program created by a centralized maintenance tool and an individual maintenance tool.

[0020]

According to a first aspect of the present invention, each control device having an individual maintenance device and a centralized maintenance device for centrally maintaining and managing the programs of these control devices are connected by a network and controlled. In a distributed control system in which a plant is controlled by a device, the individual maintenance device creates a source program, translates the source program to create and stores an execution program, and stores the execution program in the control device as necessary. Means and means for checking whether or not the execution program created by this means and the execution program of the corresponding control device match, and setting the match confirmation data to the control device when the two match, the source program Is sent to the central maintenance device via the control unit, and received from the central maintenance unit via the control unit. The control device transfers the source program of the individual maintenance device to the centralized maintenance device and the source program from the centralized maintenance device to the individual maintenance device based on the coincidence confirmation data. The centralized maintenance device is provided with means for receiving and storing the source program transferred from the control device, and means for transferring the source program of the centralized maintenance device to the control device in response to a transfer request from the control device. Is what

According to a second aspect of the present invention, each control device having an individual maintenance device and a centralized maintenance device for centrally maintaining and managing the programs of these control devices are connected by a network, and the control device controls the plant. In the distributed control system, the individual maintenance device creates a source program to which the identification data is added, translates this source program to create and stores an execution program to which the identification data is added, and adds the identification data as necessary. When the means for storing the execution program in the control device and the identification data of the source program and the identification data of the execution program of the control device are matched and the two match, the matching confirmation data is set in the control device. And the source program via the control device to the central maintenance device, and control The control device transfers the source program of the individual maintenance device to the central maintenance device based on the coincidence confirmation data, and the source program from the central maintenance device. Is provided to the individual maintenance device, and the centralized maintenance device receives and stores the source program transferred from the control device, and the centralized maintenance device transmits the source program of the centralized maintenance device according to a transfer request from the control device. And means for transferring to.

According to a third aspect of the invention, each control device having an individual maintenance device and a centralized maintenance device for centrally maintaining and managing the programs of these control devices are connected by a network, and the control device controls the plant. In the distributed control system, the individual maintenance device creates a source program to which the identification data is added, translates this source program to create and stores an execution program to which the identification data is added, and adds the identification data as necessary. When the means for storing the execution program in the control device and the identification data of the source program and the identification data of the execution program of the control device match and the two match, the first matching confirmation data is sent to the control device. The means for setting and sending the source program to the central maintenance device via the control device, The central maintenance device creates a source program to which identification data is added and translates the source program to create an execution program to which the identification data is added. And storing the same, and confirming whether the identification data of the source program and the identification data of the execution program of the control device match, and when they match, means for setting second matching confirmation data in the control device; The control device is provided with means for transmitting the program to the individual maintenance device via the control device or for receiving the program from the original program individual maintenance device via the control device. Provide a means to transfer the source program corresponding to the difference data to the centralized maintenance device or individual maintenance device according to the state of the data. Those were.

According to a fourth aspect of the invention, each control device having an individual maintenance device and a centralized maintenance device for centrally maintaining and managing the programs of these control devices are connected by a network, and the control device controls the plant. In the distributed control system, the control device is provided with means for storing an execution program and individual data for creating the execution program, and the centralized maintenance device is provided with a means for storing a common database, a common database and a control device. The individual data and the means for changing the execution program of the control device are provided, and the individual maintenance device is provided with the means for changing the execution program of the control device by reading the common database and the individual data.

[0024]

According to the first aspect of the present invention, since the original program created by the individual maintenance device on the image drawing matches the execution program of the control device, the original program is transmitted to the centralized maintenance tool. Even if a program is created, changed, or checked in each individual maintenance device that supports multiple control devices in a short time, the source program installed in the control device can be sent from the individual maintenance tool to the centralized maintenance device without error. Becomes

According to the second aspect of the invention, since the original program created on the image drawing by the individual maintenance device is transmitted to the centralized maintenance device only when it matches the execution program of the control device, Even if programs are created, changed, and confirmed by the individual maintenance devices in a plurality of control devices in a short time, the source program installed in the control device can be sent from the individual maintenance tool to the centralized maintenance device without error. In addition, it is not necessary to compare the source program with the translation of the source program to check whether the source program has the same content as that installed in the control device. Waiting time can be significantly reduced

According to the third aspect of the present invention, when the source program is edited by the individual maintenance device or the centralized maintenance device, the source programs of both maintenance tools can always be made to coincide with each other. When the program is edited, it is not necessary to send the source program to the other maintenance tool later, and the editor need not be aware of sending the source program. Also, always
Since the source programs are the same, only the difference data needs to be transmitted when the source program is changed, and the data transmission amount can be reduced, so that the screen response at the time of editing is not delayed.

According to a fourth aspect of the present invention, even if the execution program of the control device is changed in each of the centralized maintenance device and the individual maintenance device, the latest common database corresponding to the execution program currently stored in the control device and the latest Individual data can be automatically read into the central maintenance device or the individual maintenance device.

[0028]

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

FIG. 1 is a block diagram of a distributed control system showing a first embodiment of the present invention. 11 and 1 showing a conventional example
2, the same reference numerals as those in FIG. 13 indicate the same or corresponding portions. In the figure, the lower-level control device 2 includes a communication control unit 2
Individual maintenance tool 5 with A1 and match confirmation data 2A2
Includes a control program 5a, an editing program 5b, a translation program 5c, a source program 5d, and an execution program 5.
e, and these form a virtual lower controller 2V.

The control program 5a communicates with the subordinate control unit 2 as a maintenance tool, mounts the execution program 5e on the subordinate control unit 2, and executes the execution program 5e inside the maintenance tool and the execution program inside the subordinate control unit 2. Is used for activating and starting the editing program 5b for editing the source program 5d, and for activating the translation program 5c for creating the execution program.

The editing program 5b is used for editing the image drawing and creating or changing the source program 5d.
The translation program 5c is used to translate the source program 5d into the execution program 5e.

The communication control unit 2A1 controls the communication when mounting the execution program created by the individual maintenance tool 5 or the centralized maintenance tool 4 in the storage device inside the control device, the communication control when performing the comparison confirmation, and the individual maintenance. The communication control is performed when the source program is transmitted from the tool 5 to the centralized maintenance tool 4.

When the source program edited by the individual maintenance tool 5 is transmitted to the centralized maintenance tool 4, the matching confirmation data 2A2 is executed by the individual maintenance tool 5 by executing the execution program created by translating the source program inside the control device. It is set when the program is compared and checked and it matches. Further, when the original program edited by the centralized maintenance tool 4 is transmitted to the individual maintenance tool 5, the matching confirmation data 2A2 is an execution program created by translating the original program by the centralized maintenance tool 4 as an execution program inside the control device. It is set when the result of comparison and confirmation is coincident.

Next, the operation of sending the source program 5d of the individual maintenance tool 5 to the centralized maintenance tool 4 will be described with reference to FIG. First, the control program 5a of the individual maintenance tool 5 performs a process of sending the source program 5d,
When the transmission request is accepted by the lower-level control device 2, the source program 5d is translated by the translation program 5c (101, 102, 103). When the translation is completed, the translated execution program 5e is compared with the execution program in the control device 2 (104).

If the comparison results are in agreement, the individual maintenance tool 5 sends the comparison results in agreement to the control device 2 (105, 106). When the control device 2 receives the comparison result agreement, it prepares for the transfer and then requests the transmission of the source program. When the transmission request is received from the control device, the individual maintenance tool 5 transmits the source program (107, 108). The source program is transmitted in small blocks, each time the transmission request from the control device 2 is confirmed and the next data is transmitted. When the transmission of the source program is completed, the end of transmission of the source program is transmitted to the control device 2 (109, 11).
0).

On the other hand, in the subordinate control device 2, as shown in FIG. 3, when the individual maintenance tool 5 makes a transmission request to the subordinate control device 2, the individual maintenance tool 5 makes a transmission request. Is accepted (201, 20
2). When an execution program comparison request is received from the individual maintenance tool 5, the execution program of the control device 2 itself is transmitted to the individual maintenance tool 5 as comparison data (203, 20).
4).

Then, when the coincidence of the comparison result is received from the individual maintenance tool 5, the coincidence confirmation data 2A2 is set (205, 206, 207). Then, when a transfer request is made to the centralized maintenance tool 4 and a reply of acceptance is received, a transmission request of the original program is made to the individual maintenance tool 5 (209).

When data is received from the individual maintenance tool 5, the source program is received and the received data is transferred to the centralized maintenance tool 4 (210 to 212). When the end of data transmission from the individual maintenance tool 5 is received, the end of data transmission is transmitted to the centralized maintenance tool 4 to clear the coincidence confirmation data 2A2, and then end processing of data transfer such as clearing various flags not shown. Do (213
~ 216). If the data transmission end is not received, this program is restarted and the data transfer is repeated.

In response to this, the centralized maintenance tool 4
As shown in FIG. 4, when a transfer request is received from the subordinate control device 2, the acceptance is returned to the subordinate control device 2 (301, 302). As a result, if there is the source program data from the lower control device 2, the source program data is received (303, 304). When the end of data transfer from the lower-level control device 2 is received, an acceptance is returned to the lower-level control device 2 and the end process is performed (305,
306).

If the end is not received in step 305, this program is restarted and the data transfer is repeated.

FIG. 5 is a time chart showing a procedure of transmitting the original program from the individual maintenance tool 5 described with reference to FIGS. 2 to 4 to the centralized maintenance tool 4 via the lower control device 2.

In the figure, first, at the timing of T1, when a request for transmitting the original program from the individual maintenance tool 5 to the centralized maintenance tool 4 is sent to the lower control device 2,
The lower control device 2 receives it.

Next, in the individual maintenance tool 5, the source program is translated at the timing of T2, and when the translation is completed, the T
At timing 3, the execution program inside the individual maintenance tool 5 and the execution program inside the control device 2 are compared. When this comparison is completed, a match is sent from the individual maintenance tool 5 to the lower control device 2 at the timing of T4. As a result, the subordinate control device 2 sets the coincidence confirmation data 2A2, recognizes the coincidence, and sends a transfer request of the original program from the subordinate control device 2 to the centralized maintenance tool 4 at the timing of T5. When the transfer request comes from the lower-level control device 2, the centralized maintenance tool 4 accepts the transfer request and waits to receive the source program.

At the timing of T6, the individual maintenance tool 5
The source program is sent from the lower controller 2 to T7.
At the timing of, the data stored in the buffer in the lower control device 2 is transferred to the centralized maintenance tool 4.
At timings T6n to T7n, T6 and T7 are repeated.

At T8, the end of transmission of the original program is sent from the individual maintenance tool 5 to the subordinate control unit 2A, and at T9, the end of transmission is sent from the subordinate control unit 2 to the centralized maintenance tool 4. After that, the coincidence confirmation data 2A2 in the lower control device 2 is cleared, and the transmission of the source program is completed.

In the above processing, from the viewpoint of the centralized maintenance tool 4, since the source control program 2 receives the source program transmission request from the lower level control device 2, it is as if the lower level control device 2 receives the source program transmission. 2 It seems that the source program is installed inside. That is,
From the viewpoint of the centralized maintenance tool 4, it seems that the original program is transferred from the virtual lower controller 2V.

Since the original program created by the individual maintenance tool 5 on the image drawing as described above is transmitted to the centralized maintenance tool 4 only when the original program matches the execution program of the control unit 2, it is short. Individual maintenance tools for multiple control units 5 per hour
Thus, even if a program is created, changed, or confirmed, the original program installed in the control device 2 can be sent from the individual maintenance tool 5 to the centralized maintenance tool 4 without error.

FIG. 6 is a block diagram of a distributed control system showing a second embodiment of the present invention.

The same reference numerals as those in FIG. 1 showing the first embodiment indicate the same or corresponding portions, and 4a is a control program, 4
b is an editing program, 4c is a translation program, 4d is a source program, 4e is an execution program, 3A and 3B are communication control devices, 2A3, 4d1, 4e1, 5d1 and 5e1.
Indicates the tool ID time.

In this embodiment, when the image drawing is edited by the individual maintenance tool 5, the tool ID number of the individual maintenance tool 5 and the tool ID time 5d when the editing is performed are performed.
1 is saved in the source program 5d, and the source program is edited to translate the source program 5d to create the execution program 5e. The tool ID number of the source program edited and the contents of the tool ID time 5d1 when the source program is edited are used as the tool. The ID time 5e1 is stored in the execution program 5e.

Similarly, when the source program 4d is edited by the centralized maintenance tool 4, the tool ID number of the centralized maintenance tool 4 and the source program editing time are set to the tool ID time 4
The contents of the tool ID time 4d1 are saved at the tool ID time 4e1 when the source program 4d is translated to create the execution program 4e.

Further, the control device 2A and the individual maintenance tool 5 are arranged in the control room of the plant, and the centralized maintenance tool 4 is a person who produces the control device 2A via the communication control device 3A and the communication control device 3B. It is located in the factory.

With the above configuration, when the individual maintenance tool 5 edits the source program, the tool ID number and the editing time are the tool ID time 5d1 inside the source program 5d.
After the translation, the contents of the tool ID time 5d1 are saved in the tool ID time 5e1, and when the execution program is installed in the control device, the contents of the tool ID time 5e1 are saved in the tool ID time 2A3.

As a result, the tool ID and the editing time of editing the original program including the image drawing information are saved in the lower control device 2A, and the original program of the maintenance tool is sent to the centralized maintenance tool 4. sometimes,
Whether or not the source program is actually installed in the control device 2A is compared with the tool ID and the time data without having to translate the source program and create an execution program for comparison as in the first embodiment. It will be revealed by doing.

FIG. 7 shows a communication method by the control device for performing the maintenance tool shown in FIG.

In the figure, when a transmission request for the source program from the individual maintenance tool 5 to the centralized maintenance tool 4 is sent to the lower-level control unit 2A at the timing of T1, the lower-level control unit 2A receives it. At the timing of T3, the tool ID time 5d1 of the original program inside the individual maintenance tool 5 and the tool ID time 2A3 of the execution program inside the lower control device 2A are compared.

Upon completion of this comparison, the individual maintenance tool 5 sends a match to the storage device at the timing of T4.
As a result, the lower control device 2A causes the match confirmation data 2A2
Set and recognize the match. At the timing of T5, a transfer request for the source program is sent from the lower-level controller 2A to the centralized maintenance tool 4.

In the centralized maintenance tool 4, the lower control device 2
When a transfer request comes from A, the request is accepted and the source program waits for reception. At the timing of T6, the original program is transmitted from the individual maintenance tool 5 to the lower control device 2A. At the timing of T7, the lower control device 2
The data stored in the internal buffer is transferred to the centralized maintenance tool 4.

The timings of T6n to T7n are T6 and T7.
Is repeated. At T8, the end of transmission of the source program is sent from the individual maintenance tool 5 to the subordinate control device 2A,
Then, at T9, the end of transmission is sent from the lower control device 2A to the centralized maintenance tool 4. After that, the coincidence confirmation data 2A2 in the lower control device 2 is cleared and the transmission of the original program is completed.

Since the original program created on the image drawing by the individual maintenance tool 5 is transmitted to the centralized maintenance tool 4 only when the original program matches the execution program of the control unit 2A, it is short. Even if programs are created, changed, and checked by the individual maintenance tools 5 in multiple control devices 2A at the same time, the source program installed in the control device 2A can be sent from the individual maintenance tools 5 to the centralized maintenance tool 4 without error. Becomes

Further, it is not necessary to compare the source program and the execution program itself in order to confirm whether or not the source program 4 has the same content as that installed in the control device 2A, and the source program is transmitted. In that case, the waiting time for comparison can be significantly reduced.

Since the centralized maintenance tool 4 can be arranged in a production plant or the like, maintenance can be performed from a place where the designer or tester of the control device always stays. Therefore, when a trouble occurs in the control device 2A or a program problem occurs, the control device 2A
It eliminates the need for designers and testers to visit the plant, and troubles can be resolved quickly.

FIG. 8 is a block diagram of a distributed control system showing a third embodiment of the present invention.

In the figure, 4V and 5V indicate virtual shared storage areas, and the areas are secured between the centralized maintenance tool 4 and the individual maintenance tool 5 when sharing of the source program and the execution program is requested. ing. The source program 4d and the execution program 4e of the centralized maintenance tool 4 are placed in the virtual shared storage area 4V on the centralized maintenance tool 4 side.
The source program 5d and the execution program 5e of the individual maintenance tool 5 are placed in the virtual shared storage area 5V on the individual maintenance tool 5 side.

FIG. 9 is a timing chart showing a method of editing a program by the maintenance tool and the control device shown in FIG.

First, in T1 and T2, when the individual maintenance tool 5 edits an image drawing, the individual maintenance tool 5 requests the lower control device 2A and the centralized maintenance tool 4 for editing. Next, when the subordinate control device 2A and the centralized maintenance tool 4 receive an edit request at T3 and T4, the tool ID and time data between the individual maintenance tool 5 and the subordinate control device 2A are compared, Then, the tool ID and the time data are compared between the lower-level control device 2 and the centralized maintenance tool 4.

According to this comparison, if the data of either maintenance tool does not match the data of the control device 2A, the matching source program is transmitted to the other maintenance tool and the source programs match. To do so.

Next, when the source programs of the individual maintenance tool 5 and the centralized maintenance tool 4 match at T5, the source programs are stored in the virtual shared storage areas 4V, 5V.

At T6, when the data is edited on the side of the individual maintenance tool 5, in order to match the data in the virtual shared storage areas 4V and 5V, only the data at the location changed from that before the editing at T7 is used as difference data. Send to centralized maintenance tool 4 as needed. As a result, the source program in the virtual shared storage area 4V on the centralized maintenance tool 4 side matches the source program on the individual maintenance tool 5 side.

At T8, when translation is performed, each translation program operates and creates an execution program in each of the virtual shared storage areas 4V and 5V. Then, at T9, it is stored in the control device 2A, and at T10, the virtual shared storage area 4
V and 5V are opened.

Therefore, since the virtual shared storage areas 4V and 5V are provided in the individual maintenance tool 5 and the centralized maintenance tool 4, the source programs placed in the virtual shared storage areas 4V and 5V always match with each other.

In this way, when editing a source program with the individual maintenance tool 5 or the centralized maintenance tool 4, the source programs of both maintenance tools can always be made to match, so that the source program of one maintenance tool can be used. When editing the, it is not necessary to send the source program to the other maintenance tool later, and the editor does not need to be aware of sending the source program.

Since the source programs always match, only the difference data needs to be transmitted when the source program is changed, and the data transmission amount can be reduced, so that the screen response during editing is not delayed.

In the third embodiment, the matching confirmation data 2
Although it has been described that the A2 is provided inside the control device 2A,
Needless to say, the same effect can be obtained by having the control device 2A inside the centralized maintenance tool 4 or inside the individual maintenance tool 5. Further, although the source program is transmitted from the control device 2A to the maintenance tool, the same effect can be obtained by connecting the individual maintenance tool 5 to the network instead of directly connecting to the control device. .

In the first to third embodiments described above,
Although it is explained that the original program is sent from the individual maintenance tool 5 to the centralized maintenance tool 4, the centralized maintenance tool 4
The same applies to the case where the original program is transmitted from the individual maintenance tool 5 to the individual maintenance tool 5.

Although the source program is sent as it is, it goes without saying that the source program may be compressed according to a certain rule, sent, and then restored after being received. Such a compression and decompression method is a means of communication, and the original program is still sent.

FIG. 10 is a block diagram of a distributed control system showing a fourth embodiment of the present invention.

The same reference numerals as those in FIG. 14 showing the conventional example indicate the same or corresponding portions. In the fourth embodiment, the common database 6 is stored only in the storage device 4A, and the individual data 7 is stored in the control device. 2 and the execution program 11 are stored.

With the above configuration, first, when changing the execution program 11 of the control device 2 from the centralized maintenance tool 4, the centralized maintenance tool 4 reads the common database 6 from the storage device 4A, and individually from the control device 2 through the network 3. The data 7 is read and the individual data 7 is changed. An execution program 11 is created from the individual data 7 and the common database 6, and the execution program 11 and the changed individual data 7 are transferred to the control device 2 through the network 3 and changed.

On the other hand, when the individual maintenance tool 5 changes the execution program 11 of the control device 2, the individual maintenance tool 5
Reads the common database 6 from the storage device 4A via the centralized maintenance tool 4, the network 3 and the control device 2, and further reads the individual data 7 from the control device 2,
Change the individual data 7. Then, the individual maintenance tool 5 creates an execution program 11 from the individual data 7 and the common database 6, and stores the execution program 11 and the changed individual data 7 in the control device 2.

As described above, the centralized maintenance tool 4 and the individual maintenance tool 5 each execute the execution program 11 of the control device 2.
Even if is changed, the latest common database 6 and the latest individual data 7 corresponding to the execution program 11 currently stored in the control device 2 can be automatically read into the centralized maintenance tool 4 or the individual maintenance tool 5.

Even when the control device 2 is not connected to the network 3, when the execution program 11 is changed, if the part required for the control device 2 in the common database 6 is included in the individual data 7, the control device 2 The latest individual data 7 corresponding to the execution program 11 currently stored in 2 can be automatically read into the individual maintenance tool 5.

[0083]

As described above, the invention of claim 1 is
The original program created on the image drawing by the individual maintenance device is sent to the centralized maintenance device only when it matches the execution program of the control device, so it is possible to support multiple control devices in a short time. Even if a program is created, changed, and confirmed by each individual maintenance device, the source program installed in the control device can be sent from the individual maintenance tool to the centralized maintenance device without error.

According to the second aspect of the present invention, it is not necessary to compare the source program with the translation of the source program to check whether the source program has the same contents as that installed in the control device. The waiting time for comparison can be significantly reduced when sending the.

According to the third aspect of the invention, since the source programs always match, only the difference data needs to be transmitted when the source program is changed, and the data transmission amount can be reduced, so that the screen response at the time of editing becomes slow. Never.

According to the invention of claim 4, even if the execution program is changed, the latest common database and the latest individual data corresponding to the execution program currently stored in the control device are automatically transmitted to the central maintenance device or the individual maintenance device. Can be read.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a processing procedure of the individual maintenance tool in FIG.

FIG. 3 is a flowchart showing a processing procedure of the control device of FIG.

FIG. 4 is a flowchart showing a processing procedure of the centralized maintenance tool of FIG.

5 is a time chart showing communication processing of the distributed control system of FIG.

FIG. 6 is a configuration diagram of a distributed control system showing a second embodiment of the present invention.

7 is a time chart showing a communication process of the distributed control system of FIG.

FIG. 8 is a configuration diagram of a distributed control system showing a third embodiment of the present invention.

9 is a time chart showing communication processing of the distributed control system of FIG.

FIG. 10 is a configuration diagram of a distributed control system showing a fourth embodiment of the present invention.

FIG. 11 is a configuration diagram of a distributed control system showing a conventional example (1).

12 is a configuration diagram showing a centralized maintenance tool 4 of FIG.

13 is a configuration diagram showing the individual maintenance tool of FIG. 11. FIG.

FIG. 14 is a configuration diagram of a distributed control system showing a conventional example (2).

15 is an explanatory diagram showing a procedure for creating an execution program of the control device in FIG.

[Explanation of symbols]

 1 control device 2 control device 2A1 communication control unit 2A2 coincidence confirmation data 2V virtual lower control device 3 network 3A, 3B communication control device 4 centralized maintenance tool 4A storage device 4V virtual shared storage area 5 individual maintenance tool 5A storage device 5V virtual shared storage Area 6 Common database 7 Individual data 10 Monitoring operation device 11 Execution program

Claims (4)

[Claims] 1. A control device having individual maintenance devices and a centralized maintenance device for centrally maintaining and managing programs of these control devices are connected by a network,
In the distributed control system for controlling a plant by the control device, the individual maintenance device creates a source program, translates the source program to create and store an execution program, and stores the execution program in the control device. Means for confirming whether or not the execution program created by this means and the execution program of the corresponding control device match, and setting matching confirmation data in the control device; A means for transmitting to the centralized maintenance device via the control device, and means for receiving a source program from the centralized maintenance device via the control device, while the control device is based on the coincidence confirmation data, The source program of the individual maintenance device is transferred to the central maintenance device, and the source program from the central maintenance device is transferred. Means for transferring a start program to the individual maintenance device, the centralized maintenance device receiving and storing the source program transferred from the control device, and the centralized maintenance by a transfer request from the control device. And a means for transferring a source program of the device to the control device. 2. A control device having individual maintenance devices and a centralized maintenance device for centrally maintaining and managing programs of these control devices are connected by a network,
In a distributed control system for controlling a plant by the control device, the individual maintenance device creates a source program to which identification data is added, translates the source program, creates and stores an execution program to which the identification data is added, and stores the program. ,
Means for storing an execution program to which identification data is added in the control device, and whether or not the identification data of the source program and the identification data of the execution program of the control device match, and the matching confirmation data is sent to the control device. And means for transmitting the source program to the central maintenance device via the control device and receiving from the central maintenance device via the control device.
The control device transfers a source program of the individual maintenance device to the centralized maintenance device based on the matching confirmation data, and a unit of transferring the source program from the centralized maintenance device to the individual maintenance device. And a means for receiving and storing a source program transferred from the control device, and a means for transferring the source program of the central maintenance device to the control device in response to a transfer request from the control device. A distributed control system characterized by being provided with. 3. A control device having individual maintenance devices and a central maintenance device for centrally maintaining and managing programs of these control devices are connected by a network,
In a distributed control system for controlling a plant by the control device, the individual maintenance device creates a source program to which identification data is added, translates the source program, creates and stores an execution program to which the identification data is added, and stores the program. ,
Means for storing the execution program to which the identification data is added in the control device, and whether or not the identification data of the source program and the identification data of the execution program of the control device are matched, and the first matching confirmation data is obtained. While providing means for setting to the control device, means for transmitting the source program to the centralized maintenance device via the control device, and means for receiving the source program from the centralized maintenance device via the control device, The centralized maintenance device creates a source program to which identification data is added, translates the source program to create and stores an execution program to which the identification data is added, and stores the identification data of the source program and execution of the control device. Means for confirming whether the identification data of the programs match and setting the second matching confirmation data in the control device Means for transmitting the source program to the individual maintenance device via the control device or receiving the source program from the individual maintenance device via the control device, wherein the control device is configured to A distributed control system comprising means for transferring a source program corresponding to difference data to the centralized maintenance device or the individual maintenance device according to the states of the match confirmation data and the second match confirmation data. 4. Each control device having an individual maintenance device and a centralized maintenance device for centrally maintaining and managing programs of these control devices are connected by a network,
In the distributed control system for controlling a plant by the control device, the control device is provided with means for storing an execution program and individual data for creating the execution program, and the central maintenance device stores a common database. Means for changing the execution program of the control device by reading the common database and individual data of the control device, and the individual maintenance device reads the common database and the individual data And a means for changing the execution program of the apparatus.