JPH11328136A - Computer network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a computer network system which decentralizes the load of a network by decentralizing system data to a host computer and representative computers and continues to operate as a system even if the host computer stops. SOLUTION: A man-machine computer 4 which joins in the network 7 later downloads master data for operating a man-machine interface function from the man-machine computer 1 of a current representative computer by confirming a representative computer number 21 in computer master tables 14-1 to 14-3 on other man-machine computers 1 to 3 and then confirming the current representative computer. The load on host computers 5 and 6 can, therefore, be reduced and even if the host computers 5 and 6 are absent, the system operation can be carried on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a computer network system in which a plurality of man-machine computers are connected to a host computer via a network.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing a conventional computer network system disclosed in, for example, JP-A-8-44686. In FIG. A host computer 7, which collectively manages data, is a network for connecting the host computers 5, 6 and the man-machine computers 1-4. Here, the man-machine computers 1 to 4 operate by downloading the data held by the host computer 5 or 6 to its own computer.

Next, the operation will be described. In the computer network system shown in FIG. 9, data management is performed by a process on the host computer 5 or 6. The data changed by the man-machine calculators 1-4 are
The data is always transferred to the host computer 5 or 6, and is managed by the host computer 5 or 6. Each man-machine computer 1-4
At the time of startup, data is downloaded from the host computer 5 or 6 (the host computer 5 in FIG. 9) and the computer is operated. Therefore, the man-machine computers 1-4 are always equivalent to the host computer 5; If 5 is absent, data download is not possible and cannot function as a system. When the man-machine computers 1 to 4 start up at the same time, the load concentrates on the host computer 5.

[0004]

Since the conventional computer network system is configured as described above, a large number of host computers and man-machine computers are connected to the network 7, and there is a tendency to construct a huge network system. For this reason, the computers exchange information with each other using the network 7 as a medium, and as the number of connected computers increases and the amount of information increases, the network load increases and the response speed of the system increases. Will drop.

Further, in the conventional computer network system, even if an error such as a hardware failure occurs, the dual system of the host computers 5 and 6 as shown in FIG. Although the reliability is improved, the system data is centrally managed by the host computer 5 although the reliability is improved, and the management computer 1
4, since data equalization of the system is realized by downloading data, if the host computer 5 stops, data cannot be downloaded even if the other man-machine computers 1-4 are sound. There was a problem that the system was stopped.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and distributes system data to a host computer and a representative computer, thereby distributing a load on a network, and even when the host computer is stopped. It is an object of the present invention to obtain a computer network system that enables continuous operation as a system.

[0007]

According to the present invention, there is provided a computer network system comprising a man-machine computer and a representative computer designated to hold and manage master data necessary for operating a man-machine interface function. A cyclic memory that is provided so that the man-machine computer can be shared and referred to and stores a computer status table to which the current representative computer is assigned, and a current representative of the computer status table when the man-machine computer newly enters. It is provided with a representative computer monitoring determining means for recognizing a computer, downloading master data from the corresponding representative computer, and making data held in the representative computer and a newly entered man-machine computer equivalent.

[0008] A computer network system according to the present invention comprises a cyclic memory storing a current status of a representative computer and a computer status table to which computer ranks of the respective man-machine computers are assigned, and a computer status table when the representative computer is stopped. A new representative computer among the operating man-machine computers is designated according to the comparison of the rankings of the respective man-machine computers, and the current representative computer in the computer status table is updated. It is provided with representative computer monitoring determining means for downloading master data to the man-machine computer and making the data held in the new representative computer and the data held in other man-machine computers equivalent.

[0009] A computer network system according to the present invention comprises: a cyclic memory for storing a computer status table to which a current representative computer and a start history of each man-machine computer are allocated; Based on the start history of the man-machine computers in the computer status table, the man-machine computer that was in the operating state until the end is designated as the representative computer, and the current representative computer in the computer status table is updated, and the other It is provided with representative computer monitoring determining means for downloading master data to the man-machine computer to make the data held in the representative computer equivalent to the data held in other man-machine computers.

[0010] The computer network system according to the present invention is allocated to the non-volatile memory storing the priority computer definition file defining the priority of the man-machine computer and the computer status table when the computer network system is started up all at once. When the current representative computer does not exist, the representative computer among the man-machine computers is designated according to the priority order of the priority computer definition file, and the current representative computer in the computer status table is written. It is provided with a representative computer monitoring determining means for downloading master data to the computer and making the data held in the representative computer equivalent to the data held in other man-machine computers.

[0011] The computer network system according to the present invention is configured such that, when the computer network system is divided into a plurality of network systems, and each of the network systems is constructed from a state in which a representative computer is present in one network system, a priority computer is constructed. One representative computer among the man-machine computers is designated according to the priority of the definition file, the current representative computer in the computer status table is updated, and the master data is downloaded from the representative computer to another man-machine computer to represent the representative computer. It is provided with a representative computer monitoring and deciding means for making data held between a computer and another man-machine computer equivalent.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a computer network system according to a first embodiment of the present invention. In the figure, 1-4 are man-machine computers, 5 and 6 are host computers, 7 is host computers 5, 6 and a man-machine. This is a network connecting computers 1 to 4. Here, the man-machine computer 1 is a representative computer designated to hold and manage master data necessary for operating the man-machine interface functions of the man-machine computers 1-4. Operates by downloading the data held by the representative computer 1 to its own computer. FIG. 1 shows a case where the man-machine computer 4 is temporarily out of order, and after the recovery, the man-machine computer 4 is newly entered.

FIG. 2 is a conceptual diagram showing the software configuration of each man-machine computer. In the figure, 10 is the software configuration of each man-machine computer 1-4, and 11 is the state of each man-machine computer 1-4. Representative computer monitoring / determination software (representative computer monitoring determining means) for monitoring and executing each control in accordance with the change of the representative computer. Reference numeral 12 denotes a priority computer definition in which the default priority of each of the man-machine computers 1-4 is determined. These representative computer monitoring / decision software 11 and priority computer definition file 12
Is stored in a disk memory for each of the man-machine computers 1 to 4, and is used by being loaded from the disk memory to the memory of each of the man-machine computers 1 to 4. 13 is a cyclic memory shared by the man-machine computers 1-4 connected to the network 7, 14 is provided in the cyclic memory 13,
It is a computer status table to which a current representative computer and the like are assigned.

FIG. 3 is a conceptual diagram showing the details of the cyclic memory of each man-machine computer.
1 is a computer status table 1 of the man-machine computer 1
4, a storage area 14-2 is a storage area of the computer status table 14 of the man-machine computer 2, and a storage area 14-n is a storage area of the computer status table 14 of the man-machine computer n. The computer status table 14 of the other man-machine computer is also stored. The storage area 14- of the computer status table 14 of the man-machine computer 1
In FIG. 1, reference numeral 20 denotes an own computer number. In this case,
“1” is stored. Reference numeral 21 denotes a representative computer number (representative computer). In this case, “1” is stored. 22
Is an alive counter, which is incremented when the man-machine computer of the corresponding own computer number is started. In this case, the increment is performed when the man-machine computer 1 is started, and the increment is stopped when the man-machine computer 1 is stopped. Reference numeral 23 denotes a computer order, which stores the order of priority for becoming the representative computer of the man-machine computer of the own computer number. Reference numeral 24 denotes an own computer start history (start history) which stores the past start and stop times of the man-machine computer of the own computer number. Numeral 25 is a representative computer candidate flag, which displays a computer number which is considered to be the next representative computer as a flag according to the judgment of the representative computer monitoring / decision software 11 of the man-machine computer of the own computer number.

FIG. 4 is an explanatory diagram showing the equivalent processing of the cyclic memory of each man-machine computer.
3-1 to 13-3 are cyclic memories of the man-machine computers 1 to 3. Cyclic memory 13-1 to 13
-3 is divided into a computer status table readable and writable by the own man-machine computer and a computer status table readable only by the user. When data is written into the writable computer status table of the own man-machine computer, respectively. The computer status table is transferred to another cyclic memory via the network 7, and is equivalent to a computer status table that can be read only.

Next, the operation will be described. As shown in FIG. 1, two host computers 5 and 5 are connected to the same network 7.
A case will be described in which there are six and several man-machine computers 1 to 4, the failed man-machine computer 4 is repaired, and the man-machine computer 4 is started up and enters the network 7 during system operation. On the running man-machine computers 1 to 3, the representative computer monitoring / decision software 11 has already been operated to load the priority computer definition file 12 into the memory, and the representative computer monitoring / decision software 11 has been loaded. By the operation described above, the computer status table 14 is cyclically flowing on the network 7, and the computer status table 14 is equivalent to the cyclic memory 13 of each of the man-machine computers 1-3.

Here, when the man-machine computer 4 is started, first, the representative computer monitoring / decision software 11 of the man-machine computer 4 loads the priority computer definition file 12 on a memory, and then loads the network 7 To enter,
The computer status table 14-4 is mapped to the cyclic memory 13-4. At this time, the computer status tables 14-1 to 14-3 of the other man-machine computers 1 to 3 existing on the network 7 can be referred to, and the computer status tables 14-4 of the own man-machine computer 4 can be referred to. Writing is enabled, the written status flows on the network 7, and the computer status tables 14-1 to 14- of the other man-machine computers 1 to 3 are written.
3

The man machine computer 4 that has started up operates as an alive counter 22 in the computer status table 14-4.
, And then the computer status tables 14-1 to 14-3 of the other man-machine computers 1 to 3
Confirm the representative computer number 21 and confirm the current representative computer. In this case, the current representative computer is the man-machine computer 1. Further, the alive counter 22 of the representative computer 1 is checked. If the alive counter 22 is incremented and the representative computer 1 is not stopped, the representative computer 1 is determined to be the representative, and the computer status table 14-4 is checked. The computer number "1" of the representative computer 1 is written in the representative computer number 21, and the master data required for operating the man-machine interface function is downloaded from the representative computer 1. Further, the man-machine computers 1 to 3 which have already been operated detect that the alive counter 22 of the newly entered man-machine computer (unrecognized computer) 4 has started counting up,
The man-machine computer 4 is added to the last computer ranking, in this case, “4” to the computer ranking 23.

As described above, according to the first embodiment, the man-machine computer 4 that has entered the network 7 later can check the computer status tables 14-1 to 14-3 of the other man-machine computers 1-3. By confirming the representative computer number 21 and confirming the current representative computer, master data necessary for operating the man-machine interface function can be downloaded from the man-machine computer 1 of the representative computer, and the host computer 5 can be downloaded. , 6 can be reduced, and even when the host computers 5, 6 are absent, data can be downloaded from the representative computer, and the system operation can be continued.

Embodiment 2 FIG. 5 is a block diagram showing a computer network system according to the second embodiment of the present invention. The representative computer exists on the same network 7 due to the stoppage of the man-machine computer 1 of the representative computer or the separation of the network 7. This is a case where a new representative computer is determined when it is no longer used.

Next, the operation will be described. As shown in FIG. 5, two host computers 5 and 6 and several man-machine computers 1-4 exist on the same network 7, and during the system operation, the man-machine computer 1 as the representative computer fails. , The alive counter 22 of the man-machine computer 1 does not count up, so that each representative computer monitoring / operating on the other man-machine computers 2 to 4
The determination software 11 determines that the man-machine computer 1 has stopped. Each of the man-machine computers 2 to 4 checks the computer order 23 in the computer status tables 14-2 to 14-4, and if the own man-machine computer is the next representative computer candidate, the own man-machine computer becomes the representative computer. The computer number of the own man-machine computer is written in the representative computer number 21 of the status table 14, the computer order 23 is changed, and a computer order change request is output to other man-machine computers. In this case, the man-machine computer 2 is the representative computer.

After receiving the request to change the computer order from the new representative computer 2, the other man-machine computers 3 and 4 check whether the new representative computer 2 has stopped by the alive counter 22 of the new representative computer 2. And if not stopped,
The computer number of the new representative computer 2 is rewritten to the representative computer number 21 of the computer status tables 14-3 and 14-4 of the own man-machine computer, the computer order is changed, and the man-machine interface function is changed from the new representative computer 2. Download the master data required to operate. Also, when the network 7 is separated and the representative computer 1 no longer exists in the same network 7, the alive counter 22 of the representative computer 1 is not incremented, so that it is determined that the representative computer 1 has stopped, and the same as above. A new representative computer in a simple way.

As described above, according to the second embodiment, when the representative machine no longer exists on the same network 7 due to the stoppage of the man-machine computer 1 or the separation of the network 7, etc. The other man-machine computers 2 to 4 have a computer status table 14-2.
14-4 to confirm the computer ranking 23, determine a new representative computer according to the comparison of the computer ranking 23, and operate the man-machine interface function from the man-machine computer 2 of the new representative computer. Necessary master data can be downloaded, the load on the host computers 5 and 6 can be reduced, and even when the representative computer no longer exists, data can be downloaded from a new representative computer and system operation can be performed. Continuation can be made possible.

Embodiment 3 FIG. FIG. 6 is a block diagram showing a computer network system according to Embodiment 3 of the present invention. When the man-machine computers 1 to 4 are started at the same time, there is no representative computer at this time.
Then, a case where a representative computer is determined is shown.

Next, the operation will be described. As shown in FIG. 6, when the power is turned on all at once, each of the man-machine computers 1 to
When all 4 start up at the same time, each of the man-machine computers 1-4 enters the network 7 almost at the same time, although a slight time lag occurs. At this time, each man-machine computer 1-4
Is a computer status table 14-1 to 14-1 for a certain period of time.
4-4, the computer start history 24 is compared, and it is determined that the man-machine computer that has been in operation until the end stores the latest data, and the man-machine computer sets the representative computer candidate flag 25.

If one of the man-machine computers 1-4 that has entered the network 7 has the representative computer candidate flag 25 set, the man-machine computer is set as the representative computer, and the representative computer number 21 is set as the representative computer. At the same time, the master data required for operating the man-machine interface function from the man-machine computer of the representative computer to another man-machine computer is downloaded. In this case, it is the man-machine computer 1. Also,
When there are a plurality of man-machine computers for which the representative computer candidate flag 25 has been set, when comparing the start-up history 24 of the own computer due to a difference in the startup timing of each of the man-machine computers 1-4 or a reconfiguration of the network, etc. And that the man-machine computers 1-4
The comparison determination of the own computer start history 24 is repeated again, and only one representative computer candidate is determined.

As described above, according to the third embodiment, when the system is started all at once, the representative computer is determined from the comparison of the own computer start history 24, and the other representative computer is used as the representative computer. Man-machine calculator 2-4
The master data required for operating the man-machine interface function can be downloaded to the host computer, the load on the host computers 5 and 6 can be reduced, and even when a system without a representative computer is started at the same time, The representative computer can be actively determined to enable continuation of the system operation.

Embodiment 4 FIG. 7 is a block diagram showing a computer network system according to a fourth embodiment of the present invention.
This shows the determination of the representative computer when the own computer start history 24 of the computer status tables 14-1 to 14-4 does not exist or when the own computer start history 24 is the same at the time of simultaneous startup after the computer maintenance work. It is a thing.

Next, the operation will be described. As shown in FIG. 7, at the time of simultaneous start-up after computer maintenance work such as replacement of system software, if the own computer start history 24 in the computer status tables 14-1 to 14-4 does not exist, or Computer activation history 24
May be the same. In this case, in accordance with the priority order of the priority computer definition file 12 loaded on the memory from a non-volatile memory such as a disk memory, a high priority man-machine computer is determined as the representative computer, and the representative computer number 21 is rewritten. The master data required for operating the man-machine interface function from the man-machine computer of the representative computer to another man-machine computer is downloaded. The representative computer in this case is the man-machine computer 1.

As described above, according to the fourth embodiment, the self-computer activation of the computer status tables 14-1 to 14-4 at the time of simultaneous start-up after computer maintenance work such as replacement of system software. When the history 24 does not exist, or when the own computer start history 24 is the same, the representative computer is determined according to the priority order of the priority computer definition file 12 loaded on the memory from the nonvolatile memory such as the disk memory, The master data required for operating the man-machine interface function from the man-machine computer 1 of the representative computer to the other man-machine computers 2 to 4 can be downloaded, and the load on the host computers 5 and 6 can be reduced. While you can
Even when a system without a representative computer is started all at once, the representative computer can be actively determined and the system operation can be continued.

Embodiment 5 FIG. 8 is a block diagram showing a computer network system according to a fifth embodiment of the present invention. In FIG. 8, reference numerals 31 and 32 denote two-divided networks. FIG. 8 shows that the network 7 is divided into two due to a hardware failure or the like, and the two networks 31 and 32
In this case, one representative computer exists in each of the networks 31 and 32. However, when the failure of the network 7 is restored again and the network is reconstructed in one network 7, two representative computers exist. This shows a case where one computer is used.

Next, the operation will be described. As shown in FIG. 8, the network 7 is divided into two due to a hardware failure or the like, and two networks 31 and 32 are formed. 7 is restored and reconstructed into one network 7, each of the man-machine computers 1-4
Is the computer status table 14 that has been stopped
It detects that the alive counter 22 of -1 to 14-4 has counted up. Here, a non-recognized representative computer is detected, but the representative computer recognized by the own man-machine computer is compared with the priority defined in the priority computer definition file 12 of the newly detected representative computer. If the representative computer recognized by the own man-machine computer has the higher priority, the representative computer continues the process as it is. If the priority of the representative computer recognized by the own man-machine computer is inferior, the representative computer number 21 in the computer status table 14 is rewritten to the representative computer of higher priority, and the man-machine is changed from the new representative computer. Download the master data required to operate the machine interface function. In the fifth embodiment,
Although the case where the network 7 is divided into two and there are two representative computers is shown, the network 7 is divided into three or more,
Even when there are three or more representative computers, one representative computer can be determined by the same processing.

As described above, according to the fifth embodiment, the network 7 is divided into two by a hardware failure or the like, the failure of the network 7 is restored again, and the network 7 is reconstructed. When the representative computer recognized by the own man-machine computer is compared with the priority order defined in the priority computer definition file 12 of the newly detected representative computer, the two representative computers are set to one, and the representative computer is determined. Master data necessary for operating the man-machine interface function can be downloaded from the computer, the load on the host computers 5 and 6 can be reduced, and two representative computers can be actively used as one. Can be used as the representative computer, and the continuation of the system operation can be enabled.

[0034]

As described above, according to the present invention, a man-machine computer that later enters the network confirms the representative computer number in the computer status table of another man-machine computer, and confirms the current representative computer. by doing,
Master data required to operate the man-machine interface function can be downloaded from the man-machine computer of the representative computer, so that the load on the host computer can be reduced, and even if the host computer is absent, the representative computer can be downloaded. Thus, there is an effect that the data can be downloaded from the server and the system operation can be continued.

According to the present invention, the man-machine computer of the representative computer is stopped, or the network is separated, and so on.
When the representative computer no longer exists on the same network, the other man-machine computers check the computer order in the computer status table, determine a new representative computer according to the comparison of the computer order, and determine the new representative computer. The master data required to operate the man-machine interface function can be downloaded from the man-machine computer of the representative computer, so that the load on the host computer can be reduced and even if the representative computer no longer exists, Data can be downloaded from the new representative computer, and the effect that the system operation can be continued can be obtained.

According to the present invention, when the systems are started all at once, the representative computer is determined from the comparison of the start histories,
The master machine required to operate the man-machine interface function can be downloaded from the man-machine computer of the representative computer to another man-machine computer, and the load on the host computer can be reduced. Even when a system is not started simultaneously, the representative computer can be actively determined and the operation of the system can be continued.

According to the present invention, when the start history of the computer status table does not exist or when the start histories are the same at the time of simultaneous start-up after the computer maintenance work such as replacement of the software of the system, the disk, etc. To determine the representative computer according to the priority order of the priority computer definition file loaded on the memory from the non-volatile memory, and to operate the man-machine interface function from the representative computer's man-machine computer to another man-machine computer The required master data can be downloaded, the load on the host computer can be reduced, and even when a system without a representative computer is started all at once, the representative computer is actively determined and the system operation is continued. Is obtained.

According to the present invention, when the network is divided into a plurality of parts due to a hardware failure or the like, the failure of the network is restored again, and the network is reconstructed into one network, a representative recognized by the own man-machine computer. In order to operate the man-machine interface function from a plurality of representative computers according to the comparison of the priority order defined in the priority computer definition file between the computer and the newly detected representative computer. The master data required for the computer can be downloaded, the load on the host computer can be reduced, and the plurality of representative computers can be actively replaced by one representative computer, so that the system operation can be continued. An effect that can be made possible is obtained.

[Brief description of the drawings]

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

FIG. 2 is a conceptual diagram showing a software configuration of each man-machine computer.

FIG. 3 is a conceptual diagram showing details of a cyclic memory of each man-machine computer.

FIG. 4 is an explanatory diagram showing equivalent processing of a cyclic memory of each man-machine computer.

FIG. 5 is a block diagram showing a computer network system according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a computer network system according to a third embodiment of the present invention.

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

FIG. 8 is a block diagram showing a computer network system according to a fifth embodiment of the present invention.

FIG. 9 is a block diagram showing a conventional computer network system.

[Explanation of symbols]

1-4 Man-machine computer, 5, 6 Host computer, 7
Network, 11 representative computer monitoring / determination software (representative computer monitoring determining means), 12 priority computer definition file, 13, 13-1 to 13-4 cyclic memory, 14, 14-1 to 14-4 computer status table, 21 representative computer number (representative computer), 23
Computer ranking, 24 Own computer activation history (activation history).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Ueda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Within Mitsubishi Electric Corporation (72) Inventor Atsushi Kayaki 1-1-1, Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo No. 2 Melco Power Systems Co., Ltd.

Claims (5)

[Claims] 1. A plurality of man-machine computers connected to a host computer via a network, and a designation is made to hold and manage master data required for operating a man-machine interface function among the man-machine computers. A representative computer, a cyclic memory that is provided so that each of the man-machine computers can be shared and referred to and stores a computer status table to which the current representative computer is allocated, and a desired man-machine computer newly enter In this case, the current representative computer in the computer status table is recognized, the master data is downloaded from the corresponding representative computer via the network, and the data held in the representative computer and the newly entered man-machine computer are equivalent. Computer with a representative computer monitoring determining means Network system. 2. A plurality of man-machine computers connected to a host computer via a network, and a designation is made to hold and manage master data necessary for operating a man-machine interface function among the man-machine computers. The representative computer and a cyclic memory that is provided so that each of the man-machine computers can be shared and referenced, and stores a current status of the representative computer and a computer status table to which the computer ranking of each of the man-machine computers is assigned, When the representative computer is stopped, a new representative computer among the operating man-machine computers is designated according to the comparison of the computer ranks of the man-machine computers in the computer status table, and the current status of the computer status table is specified. Update the representative computer from the new representative computer A computer network system including a representative computer monitoring and deciding unit that downloads master data to another man-machine computer via the network and equalizes data held in the new representative computer and the other man-machine computer. . 3. A plurality of man-machine computers connected to a host computer via a network, and a designation is made to hold and manage master data required to operate a man-machine interface function among the man-machine computers. A representative computer and a cyclic memory that is provided so that each of the man-machine computers can be shared and referred to, and stores a current representative computer and a computer status table to which a start history of each of the man-machine computers is assigned, When the computer network system is started up all at once, the man-machine computer which has been in the operating state until the end based on each start history of the man-machine computer in the computer status table is designated as a representative computer, and the computer status table is displayed. Update the current representative computer of And a representative computer monitoring and deciding means for downloading master data from the representative computer to other man-machine computers via the network and equalizing data held in the representative computer and the other man-machine computers. Computer network system. 4. A plurality of man-machine computers connected to a host computer via a network, and a designation is made to hold and manage master data necessary for operating a man-machine interface function among the man-machine computers. The defined representative computer, a cyclic memory that is provided so that each of the man-machine computers can be shared and referred to and stores a computer status table to which the current representative computer is allocated, and defines the priority of the man-machine computer The non-volatile memory storing the priority computer definition file and the priority order of the priority computer definition file when the current representative computer allocated to the computer status table does not exist when the computer network system is started up all at once. According to the above man-machine calculator While specifying the representative computer, write the current representative computer of the computer status table, download master data from the representative computer to other man-machine computers via the above network, and connect the representative computer and other man-machine computers with each other. A computer network system comprising: a representative computer monitoring and deciding unit for making the data held in the computer equivalent. 5. A plurality of man-machine computers connected to a host computer via a network, and, among these man-machine computers, designation so as to hold and manage master data necessary for operating a man-machine interface function. The defined representative computer, a cyclic memory that is provided so that each of the man-machine computers can be shared and referred to and stores a computer status table to which the current representative computer is allocated, and defines the priority of the man-machine computer And a non-volatile memory storing the defined priority computer definition file, and the computer network system is divided into a plurality of network systems.
When one network system is constructed, one representative computer among the man-machine computers is designated according to the priority order of the priority computer definition file, and the current representative computer in the computer status table is updated. A computer network system including a representative computer monitoring and deciding unit that downloads master data from a computer to another man-machine computer via the network and equalizes data held in the representative computer and the other man-machine computer. .