JP3237443B2 - Control computer network system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network system for connecting various objects to be controlled and a plurality of computers for controlling them.

[0002]

2. Description of the Related Art Conventionally, there is a system disclosed in Japanese Patent Application Laid-Open No. HEI 6-105372 in which a control unit for controlling a plurality of devices connected on a network is formed on one board. In this system, a network control module, a digital control module, an extension module, and the like are mounted on a base frame, and these modules are connected by wiring on the base frame. Each of these modules is in the form of a card and can be removed.
Each card has only one function, and the signal line that enables connection with the control target etc.
On the base frame, only the network control module is connected. Therefore, in this system, one control unit is configured by the network control module, the digital control module, and the extended control module formed on the base frame.

[0003]

However, according to the above-mentioned prior art, when a plurality of the control units are connected and installed, a LAN signal line must be laid to interconnect the control units. There is a problem that the number of wiring steps for the LAN signal line increases in proportion to the number of control units installed adjacently.

An object of the present invention is to provide a network system capable of reducing the number of wiring steps when connecting a microcomputer system as a control unit to a LAN signal line connected to a control target.

[0005]

In order to solve the above-mentioned problems, the present invention relates to a system in which a plurality of microcomputer systems can be connected to a LAN. A backplane having a LAN signal line connected to the LAN and a plurality of first coupling means provided on the LAN signal line; A control panel having third coupling means provided on another signal line, a microcomputer system built-in, a second coupling means coupled to the first coupling means, and a third coupling means A required number of control cards formed in a card shape added according to the scale of a control target such as a plant; The respective second coupling means And fourth respectively third means
Are connected in parallel with each other via the LAN signal line, and further, a connector is provided on the backplane and connected by a system bus, and the other control logic execution unit of the control card is connected A system is configured by providing a connector, connecting the connector to the other connector, and performing mutual communication between a required number of control cards between control logic execution units in each control card, and connecting to the LAN. Provided is a network system for a control computer, which exchanges data with a plurality of connected control targets outside a control panel.

Further, the present invention provides a system in which a plurality of microcomputer systems can be connected to a LAN, comprising two LANs respectively connected to a plurality of control targets and computers and arranged outside a control panel, The backplane has a LAN signal line connected to each of the two LANs, a plurality of first coupling means provided on the LAN signal line, and another LAN signal line and the other LA.
A control panel having a third coupling means provided on the N signal line, a microcomputer system built-in, a second coupling means coupled to the first coupling means, and a third coupling means A required number of control cards formed in a card shape added according to the scale of a control target such as a plant, and a plurality of the first coupling means, respectively. When the second coupling means is coupled, they are connected in parallel via the LAN signal line,
Further, a connector is provided on the backplane, connected by a system bus, another connector of the control logic execution unit of the control card is provided, and the connector is connected to the other connector, and the control logic execution unit of each control card is The system was configured by performing mutual communication between a required number of control cards between the LANs and connected to the LAN.
A network system for a control computer, which exchanges data with a plurality of control targets outside a control panel.

The present invention also relates to a system in which a plurality of microcomputer systems can be connected to a LAN, comprising a LAN connected to a plurality of control targets and provided outside the control panel, and the LAN is provided on a back brain. LA connected to
N signal lines and other LAN signal lines, a computer provided on the other LAN signal lines, and a plurality of first coupling means provided on the two LAN signal lines, and another LAN A control panel having a signal line and a third coupling unit provided on the other LAN signal line, including a microcomputer system, and a second coupling unit coupled to the first coupling unit; And a fourth coupling means coupled to the third coupling means, wherein a required number of control cards formed in a card shape are added in accordance with the scale of a control target such as a plant; The second coupling means is coupled to each of the first coupling means, and the fourth coupling means is coupled to each of the third coupling means, so that they are connected in parallel via the LAN signal line. And a connector Connected by a bus, provided with another connector of the control logic execution unit of the control card, and connected with the connector to the other connector. The present invention provides a network system for a control computer characterized in that a system is configured by performing mutual communication between the plurality of control objects connected to the LAN and exchanging data with a plurality of control targets outside a control panel. Further, the present invention provides a system in which a plurality of microcomputer systems can be connected to a LAN, comprising a LAN connected to a plurality of control targets and disposed outside a control panel, and connected to the LAN on a backplane. A control panel having a LAN signal line and a plurality of first coupling means provided on the LAN signal line, and having another LAN signal line and a third coupling means provided on the other LAN signal line In addition, a connector is provided on the backplane and connected by a system bus,
Providing another connector for the control logic execution unit of the control card, connecting the connector to the other connector, incorporating a microcomputer system between the control logic execution units in each control card, A second coupling means coupled to the third coupling means and a fourth coupling means coupled to the third coupling means.
A required number of control cards formed in a card shape added according to the scale of a control target such as a plant, and a plurality of first coupling means each including a second coupling means. And fourth coupling means respectively coupled to the third coupling means, wherein a required number of control cards each have a memory for storing common data, and a required number of control cards are connected via the LAN signal line. To provide a control computer network system characterized in that they are connected in parallel and communicate with each other. The present invention also relates to a system in which a plurality of microcomputer systems can be connected to a LAN.
An AN, a LAN signal line connected to the LAN on the backplane, and a plurality of first coupling means provided on the LAN signal line, and the other LAN signal line and the other LAN signal line , A third coupling means provided therein, a microcomputer system built-in, a second coupling means coupled to the first coupling means, and a fourth coupling means coupled to the third coupling means. A required number of control cards formed in a card shape having the same shape and added in accordance with the scale of a control target such as a plant;
Are respectively connected to the second connecting means, and the third connecting means are respectively connected to the fourth connecting means. The required number of control cards each have a memory for storing common data, and a plurality of control cards are provided. A program for controlling the control object is stored, and a connector is provided on the backplane and connected by a system bus. Another connector of the control logic execution unit of the control card is provided and the connector is connected to the other connector. A required number of control cards between the control logic execution units in each control card are connected to the LAN.
Provided is a network system for a control computer, which is connected to each other via a signal line to perform mutual communication.

[0008]

According to the present invention, a LAN signal line connected to an object to be controlled is previously installed on a backplane as a control panel, and the object to be controlled is controlled with respect to a joint provided on the LAN signal line. Signals are exchanged between the control cards on the backplane by joining the control card joints on the card in which the microcomputer system is built.

[0009] This makes it possible to easily arrange a plurality of control cards on the backplane,
When placing the control card on the backplane, LA
Wiring of the N signal line becomes unnecessary, and the number of connection steps of the LAN cable can be reduced.

[0010]

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

FIG. 1 shows the principle of the present invention. A LAN signal line 107 is previously set on a back plane 108 of the control panel, and this LAN signal line 107 is
A connector 102 is provided on the LAN signal line 107 on the back plane 108 while being connected to the AN 101. The control card 104 including the microcomputer system formed in a card shape is connected to the LAN signal line 1 on the backplane.
07 is provided. The connector 103 provided on the control card 104 is connected to the connector 102 provided on the LAN signal line 107 on the backplane.
Not only communication between microcomputer systems in the backplane, but also LAN on the backplane
LAN 101 outside the backplane via signal line 107
The communication with the microcomputer system connected to is enabled.

FIG. 2 shows an overall configuration of an embodiment when the present invention is used in a plant control system.

The network is composed of the control LAN 1-1, PI /
O LAN 2-1. The control LAN is a LAN for transferring data between the controllers for control.
As a specific example, MAP (IEEE802.4) has been put to practical use. A specific example of the PI / O LAN is a field bus. Fieldbus is drafting a standard at the ISASP50 Standards Committee and is working on standardization. In the control LAN 1-1,
A computer 7 for controlling devices connected to the control LAN 1-1 such as a control card 3; and an MMI (man-machine interface) 8 for an operator or the like to monitor and correct the operation state of a control target on a network. Is connected to the PI / O LAN 2-1. A converter 6-3 for converting a signal on the plant side into a signal that can be handled by the control card 3, a sensor having an intelligent function,
It is connected to the actuator 6-2.

A control LAN 1-2 and a PI / O LAN 2-2 are connected in advance in the backplane 4 which is a feature of the present invention. The control card 3 for control is connected to the backplane 4. The control card 3 has a function of a control LAN interface. The required number of control control cards 3 to be inserted into the backplane 4 is added according to the size of the plant, and the mutual exchange of data between the control control cards 3 is controlled by the control LAN 1-2 and the PI / OLAN in the backplane 4.
By performing the control via 2-2, the processing performance of the entire control system can be improved.

Next, an example of a communication operation on the PI / OLAN 2-1 in a control system using the control card 3 and an example of a memory configuration in the control card will be described with reference to FIG.

The control control card 3 has transfer memories 10-1 and 10-2 built therein.
Indicates the address space of the memory in the control card A for control and 10-2 indicates the address space of the memory in the control card B for control.

As is apparent from FIG. 3, input and output data from the sensors a and b are stored in the memories at addresses A01 and A02 as common data. As an operation of the system, a large number of process input / output signals from the sensors and the actuator 6-2 are written into the transfer memory 10-1 of the control card A3 for control and periodically transferred to the transfer memory 10-2 of the other control card B3. And performs an operation of transferring the data so that the transfer memories 10-1 and 10-2 of the control card 3 have the same data. Each control card 3 can refer to necessary information from the plant only by accessing the memory.

Here, a first embodiment of the present invention will be described.

As shown in FIG. 4, the backplane 4 includes a control LAN 1-2 and a PI / O LAN 2- on a single board.
2 are connected and a connector 9-3 is connected to the control LAN 1-2 and the PI / O LAN 2-2 in order to enable connection with the connector 9-1 provided in the control card 3 for control shown in FIG. Is provided. Also, the control LAN 1-2 and the PI / O LAN 2-2 in the backplane
Is composed of two lines, a signal line and a ground line, and can be wired using an optical cable, a coaxial cable, a twisted pair cable or the like according to the system. The control LAN signal lines inside and outside the backplane and the PI / O LA
As the N signal line, a serial line or a parallel line can be used.

The connector 9 of the control card 3 for control
-1 is connected to the connector 9-3 of the backplane 4, and the control LAN 1-1 and PI / O outside the backplane are connected.
Connector 9-20 and connector 9 attached to LAN 2-1
-2, the control card 3 is connected to the control LAN 1-1 outside the backplane and to the PI / OL.
This leads to AN2-1. Although the number of connectors on the back plane 4 is six in FIG. 4, it is not limited to this number.

According to this embodiment, the plurality of connectors 9 provided on the signal lines 1-2 and 2-2 enabling connection to the control LAN 1-1 and the PI / O LAN 2-1 outside the backplane. If the desired number of control cards 3 are connected to -3 as needed, the processing performance can be easily improved.

Further, by realizing the control card 3 having the same shape, the mass production effect can be achieved, and the cost can be reduced by reducing the number of cable wirings.

As shown in FIG. 4, a parallel system bus 2-4 is provided between each connector 9-6 on the backplane 4, and a connector 9 on the system bus 2-4 is provided.
By connecting -6 to the connector 9-7 of the control logic execution unit of the control control card 3, data transfer between the control logic execution units of the control control cards 3 becomes possible. Further, the serial line 1-
By wiring two or more of each of 2, 2 and 2-2, the control L
It is also possible to multiplex AN and PI / O LANs.

Next, a second embodiment of the present invention will be described with reference to FIGS.

The system configuration is the same as in the first embodiment.

The unit in FIG. 6 has a structure in which a backplane is attached to a chassis on a box. The control LAN signal lines 1-2 and P are located above and below the unit 4-4.
The I / O LAN signal line 2-2 is wired. On these signal lines, control LAN signal line 1-1, PI / O LA
Connector 9-2 for connecting to N signal line 2-1 and terminal 9-
5 are provided. The control LAN 1 outside the unit
1. The connector 9-20 is mounted on the PI / O LAN 2-1. Terminals 9-4 are provided above and below the control card 3 for control shown in FIG. By fixing the control card 3 with screws or the like,
The terminal 9-4 comes into contact with the lines 1-2 and 2-2 in the unit,
Communication between the plurality of control control cards 3 becomes possible.

Incidentally, the card fixing method is not limited to the above method.

Further, according to the present embodiment, the number of connectors can be reduced, and the width of the control card 3 can be reduced, so that the mounting efficiency of the card can be improved.

Since the communication method on the LAN is the same as that of the first embodiment, the description is omitted here.

Next, a third embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 8 is a diagram showing the configuration of a backplane according to a third embodiment of the present invention, and FIG. 9 is a configuration diagram of a control card for control.

In FIG. 8, a control LAN 1-2 is wired in the backplane 4, and a connector 9-3 is provided on the control LAN 1-2. The control LAN 1-1 outside the backplane is provided with a connector 9-20 for connecting to the connector 9-2 on the backplane 4.
A power supply line 1-3 is wired in the backplane 4, and a connector 9-10 is provided thereon.
Power is supplied from a power connector 9-15. The connector 9-3 is a control control card 3 shown in FIG.
And the connector 9-10 corresponds to the connector 9-12 of the control card 3 for control.

The control card 3 for control includes:
Connector 9 for connecting control LAN 1-1 outside the backplane directly to control card 3 for control
-14, and a converter 9-13 for converting a voltage of 100 V to 5 V are provided.

The operation of the control card 3 will be described below.

Data from the control LAN 1-1 is input from the connector 9-14 or the connector 9-11, and the data is supplied to the transformer isolation circuit 11-4 in the control control card 3,
The signal is sent to the control logic execution unit 11-6 via the demodulation circuit 11-2 and the receiver 11-5 and is processed. The transmission data is
The signal is sent to the control LAN 1-1 via the driver circuit 11-5, the modulation circuit 11-3, and the transformer isolation circuit 11-4. The connector 9-14 and the connector 9-11 are connected to the switch 11-1.
Choose by.

Next, FIG. 10 shows a configuration example in which the control LAN 1-1 in this embodiment is directly connected to a control card for control. The control card 3 for control is distributed and arranged. The power is input at 100V to each control card 3 unit, and 5V is supplied to the converter 9-13.
Is supplied and converted. Control card 3 for control
By switching the switch inside to the connector 9-14 side and connecting the cable of the control LAN 1-1 to the connector 9-14, a plurality of distributed control cards 3 are connected by the control LAN 1-1 and communication is possible. Becomes

Next, FIG. 11 shows a configuration example in which the control card in this embodiment is connected to the control LAN 1-1 via the backplane. The control card 3 is inserted into the backplane 4, and the control card 3 is connected to the control LAN 1-2 in the backplane 4. The control LAN 1-1 is connected to the backplane 4. The switch in the control card 3 is switched to the connector 9-11. Since the control cards 3 are connected by the control LAN 1-1, they can communicate with each other. As the power supply, a 100 V power supply is input from the power supply connector 9-15. Each control card 3 receives a power of 100 V from the connector 9-10.
The supplied voltage of 100 V is converted to 5 V by the converter 9-13.

In the present embodiment, the power supply line 1-3 in the back plane is set to 100 V, but the present invention is not limited to this, and may be 5 V, 3.3 V, or the like. When a voltage of 5V is input, a voltage of 5V is supplied to each control card 3, and the transformer 9-13 is not required.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 12 shows the overall configuration of a relatively small-scale control system using the present invention.

In this embodiment, sensors and actuators 6
This is an example of a small-scale network control system in which the number of control objects such as -2 is not so large and monitoring by an operator or the like is not necessary.

The network comprises only the PI / O LAN 2-1. Control LAN in backplane 4
1-2 and a PI / O LAN 2-2 are installed, and a control card 3 for control and a computer 7 are connected to the backplane 4. The computer 7 has a control LAN 1-
The control of each control card 3 is performed via the control card 2.

According to the configuration of this embodiment, since the control of the entire network can be performed only by the backplane 4, a very compact system configuration can be realized. LA
Since the communication method on N is the same as in the first embodiment,
Here, the description is omitted.

As described above, the control system has been described as an example, but the present invention is not limited to the control system.
The present invention is also applicable to an information processing system.

The embodiment of the control computer network system of the present invention has the following configuration.

A control panel having a LAN signal line connected to a plurality of objects to be controlled and first joining means provided on the LAN signal line. The control panel is connected to a LAN signal line provided on the control panel, and includes a first connector group (9-3) provided as a pair, a control LAN and a PI / OL.
A second connector group (9-2) for interfacing with the AN is provided on the board. This control panel is
A plurality of units may be used in combination, or a box-type unit as shown in FIG. 6 may be used. In addition, to enable direct communication between control cards,
A third connector group (9-6) may be provided corresponding to each of the first connector groups.

A control card incorporating a microcomputer system and having second joining means. The control card includes a control logic execution unit, a network interface,
The second joining means comprises a group of connectors corresponding to these configurations. Each control card stores a program for controlling a plurality of control targets on the LAN signal line. Therefore, the increase or decrease of the control card is determined according to the increase or decrease of the control target. The specific configuration of the control card may be as shown in FIGS. According to this configuration, the control panel is provided with a LAN signal line on one side and a power supply line on another side. The concept of the control card includes a cassette or a printed circuit board.

A system comprising a computer, an MMI (man-machine interface), a control panel, a control target, and a LAN signal line for exchanging information by communicating these. The control target includes a plant, a vehicle such as an automobile, and a home appliance such as a washing machine and an air conditioner. In this system, the effect is remarkable when a LAN connecting workshops is used. This system can also increase the number of control panels according to the size of the plant.

[0049]

According to the present invention, when a microcomputer system is installed adjacent to a microcomputer system, the microcomputer system is connected to a backplane provided with a LAN signal line via a connector.
The LAN signal line on the backplane enables communication between microcomputer systems. Therefore, by connecting a LAN cable between the microcomputer systems, which is conventionally required, the connection becomes unnecessary, and the number of wiring steps can be reduced. Further, the microcomputer system can be made compact.

[0050]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of a microcomputer system according to the present invention.

FIG. 2 is an overall configuration diagram of a control system to which the present invention is applied.

FIG. 3 is a diagram illustrating a communication method on a PI / O LAN and a memory configuration in a control card for control according to the present invention.

FIG. 4 is a configuration diagram of a backplane according to the first embodiment of the present invention.

FIG. 5 is a configuration diagram of a control card for control according to a first embodiment of the present invention.

FIG. 6 is a configuration diagram of a unit according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a control card for control according to a second embodiment of the present invention.

FIG. 8 is a configuration diagram of a backplane according to a third embodiment of the present invention.

FIG. 9 is a configuration diagram of a control card for control according to a third embodiment of the present invention.

FIG. 10 is a system configuration diagram when a control card for control according to a third embodiment of the present invention is directly connected to a control LAN.

FIG. 11 is a system configuration diagram when a control card for control is connected to a control LAN via a backplane according to a third embodiment of the present invention.

FIG. 12 is an overall configuration diagram of a system according to a fourth embodiment of the present invention.

[Explanation of symbols]

1-1: Control LAN, 1-2: Control LAN on backplane, 1-3: Power line, 2-1: PI / O LAN,
2-2: PI / O LAN on backplane, 2-4
... System bus between CPUs, 3 ... Control card for control, 4 ... Backplane, 6-2 ... Sensor and actuator 6-3 ... Signal converter, 7 ... Computer for control, 8 ... Man-machine interface, 9-1 ... Control Connector provided on control card for PC, 9-2 ... external LAN
9-3: Connector provided on the backplane, 9-20: Connector for connection to the backplane

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akihiro Ohashi 5-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Omika Plant (72) Inventor Masahiro Kayama 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Hitachi Laboratory (72) Inventor Ryoichi Takamatsu 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Ltd. Omika Plant (56) References JP-A 1-253393 (JP, A JP-A-1-133101 (JP, A) JP-A-6-85819 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G05B 15/00-15/02 G06F 13 / 00 H04L 12/00 H04Q 9/00

Claims (5)

(57) [Claims] In a system in which a plurality of microcomputer systems can be connected to a LAN, an LA connected to a plurality of control targets and disposed outside a control panel.
N, on the backplane, a LAN signal line connected to the LAN and a plurality of first coupling means provided on the LAN signal line, and the other LAN signal line and the other signal line And a control panel having a third coupling means provided in the control panel. The control panel includes a microcomputer system, has a second coupling means coupled to the first coupling means, and is coupled to the third coupling means. A required number of control cards formed in a card shape added in accordance with the scale of a control target such as a plant, and a plurality of second coupling means respectively provided to the plurality of first coupling means. The coupling means and the fourth coupling means are coupled to the third means, respectively, so that they are connected in parallel with each other via the LAN signal line. Further, a connector is provided on the backplane and the connection is made by the system bus. I Another connector of the control logic execution unit of the control card is provided, and the connector is connected to the other connector to perform mutual communication between a required number of control cards between the control logic execution units in each control card. By doing so, the system was configured and connected to the LAN,
A network system for a control computer, which exchanges data with a plurality of control targets outside a control panel. 2. A system in which a plurality of microcomputer systems can be connected to a LAN. The system includes two LANs connected to a plurality of control targets and a computer, respectively, and disposed outside a control panel, and provided on a backplane. , A LAN signal line connected to each of the two LANs, and a plurality of first coupling means provided on the LAN signal line, and provided on another LAN signal line and the other LAN signal line. A control panel having a third coupling means provided therein, a microcomputer system built-in, a second coupling means coupled to the first coupling means, and a second control means coupled to the third coupling means. A required number of control cards formed in the form of a card, each of which is added according to the scale of a control target such as a plant; But Wherein L by being engaged
They are connected in parallel via an AN signal line, further provided with a connector on the backplane and connected by a system bus, and provided with another connector for the control logic execution unit of the control card to connect the connector to the other connector Connected to the LAN by performing a mutual communication between a required number of control cards between the control logic execution units in each control card.
A network system for a control computer, which exchanges data with a plurality of control targets outside a control panel. 3. A system in which a plurality of microcomputer systems can be connected to a LAN, wherein the LA connected to a plurality of control targets and disposed outside the control panel.
N, a LAN signal line connected to the LAN, another LAN signal line, a computer provided on the other LAN signal line, and a plurality of computers provided on the two LAN signal lines. A first connection means, and another LAN
A control panel having a third coupling means provided on the signal line and the other LAN signal line, a microcomputer system built-in, and a second coupling means coupled to the first coupling means; And a fourth coupling means coupled to the third coupling means, wherein a required number of control cards formed in a card shape are added in accordance with the scale of a control target such as a plant; The LA coupling is achieved by coupling the second coupling means to each of the first coupling means and the fourth coupling means to each of the third coupling means.
N are connected in parallel via the N signal line. Further, a connector is provided on the backplane and connected by a system bus, and another connector of the control logic execution unit of the control card is provided to connect the connector to the other connector. Connected to the LAN by performing a mutual communication between a required number of control cards between the control logic execution units in each control card.
A network system for a control computer, which exchanges data with a plurality of control targets outside a control panel. 4. A system in which a plurality of microcomputer systems can be connected to a LAN, wherein the LA connected to a plurality of controlled objects and disposed outside the control panel.
N, a LAN signal line connected to the LAN on the backplane, a plurality of first coupling means provided on the LAN signal line, and another LAN signal line and the other LAN signal line. A control panel having a third coupling means provided on the backplane, a connector is provided on the backplane and connected by a system bus, and another connector of the control logic execution unit of the control card is provided to A microcomputer system built in between the control logic execution units of the control cards connected to another connector, a second coupling unit coupled to the first coupling unit, and a third coupling unit; A required number of control cards formed in a card shape added according to the scale of a control target such as a plant, and the plurality of first coupling means. The required number of control cards are each provided with a memory for storing common data, and the required number of control cards are respectively coupled to the second coupling means and the fourth coupling means to the third coupling means. Is a network system for a control computer, characterized in that they are connected to each other in parallel via the LAN signal line and communicate with each other. 5. A system in which a plurality of microcomputer systems can be connected to a LAN, wherein the plurality of microcomputer systems are connected to a plurality of control targets, the LAN is provided, and a LAN signal line connected to the LAN and a LAN signal line on a backplane are provided. And a plurality of first coupling means provided on the LAN, and further comprising another LAN signal line and third coupling means provided on the other LAN signal line; A control card, which has a second coupling means coupled to the first coupling means and a fourth coupling means coupled to the third coupling means, and is formed into a card having the same shape as the control card, A required number added in accordance with the scale of the control target, such as the second coupling means to each of the plurality of first coupling means, and the fourth coupling means to each of the third coupling means, Required number of systems The control card has a memory for storing common data and stores programs for controlling a plurality of control objects. Further, a connector is provided on a backplane and connected by a system bus, and a control logic execution unit of the control card is provided. A required number of control cards are connected to each other via the LAN signal line between the control logic execution units in each control card by connecting the connector to the other connector. A network system for a control computer, which performs mutual communication.