JPH11243436A - Communication-use lsi control device, its method and distributed control network system having the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and versatile LSI having few pins by suppressing the increase in the number of I/O pins necessary for a communication-use LSI. SOLUTION: A control logic 212 selects selection means 209 to 211 on the basis of switching information set in a switch 215, ROM 213, ROM 214 and so on and performs communications by switching this selection means to any of communication controllers 205 to 208 incorporated in a communication LSI 201.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LSI incorporating a plurality of communication controllers for use in a computer system or the like which communicates with the outside by connecting to a communication network such as a network, that is, a control device for a communication LSI, LSI control method,
And a distributed control network system having a communication LSI control device.

[0002]

2. Description of the Related Art Recent advances in LSI manufacturing technology have made it possible to incorporate large-scale circuits in LSIs at low cost. For this reason, the number of package pins has a greater effect on the cost of the LSI than the circuit scale, and there is a problem in that using a package with a large number of pins increases the cost of the LSI significantly. However, a communication LSI used in a conventional computer system or the like requires a dedicated I / O pin for each communication controller.

For this reason, when a large number of communication controllers are to be built in an LSI, there is a problem that the number of I / O pins of the LSI increases and the cost increases. The communication LSI is intended to be used for general purposes,
A U / multi-channel ROM / RAM controller or the like is usually built in, but if it is not used in the system, it becomes a useless I / O pin. Further, if an LSI is developed in accordance with the system to be used, efficiency is high, but there is a disadvantage that the development of the LSI requires a huge cost.

[0004]

As described above, LS
If a large number of communication controllers are to be built in I, there is a problem that the number of I / O pins of the LSI increases and the cost increases. The communication LSI is intended to be used for general purposes, and includes a CPU and a multi-channel ROM.
Usually, a / RAM controller or the like is built in, but if it is not used in the system, it becomes a useless I / O pin. Further, if the LSI is developed in accordance with the system to be used, the efficiency is high, but there is a disadvantage that the development of the LSI requires a huge cost.

The present invention has been made in view of the above circumstances, and has a function of switching an I / O pin of an LSI to a communication port for a specific communication controller to use the I / O pin required for the LSI. A low-cost, highly versatile LSI that suppresses an increase in the number of pins and can be mounted on an inexpensive LSI package with a small number of pins, that is, a control device for a communication LSI.
An object of the present invention is to provide a communication LSI control method and a distributed control network system having a communication LSI control device.

[0006]

In order to achieve the above object, the present invention provides a communication LSI control device for controlling a communication LSI, comprising a communication control means for controlling communication in accordance with a plurality of different communication protocols. Switching information setting means for setting switching information for selecting the communication control means,
Selecting means for selecting the communication control means based on the switching information set by the switching information setting means and switching the selected communication control means to correspond to a predetermined I / O pin of the communication LSI; It is characterized by.

According to such a configuration, the communication control means corresponding to a plurality of different communication protocols is switched based on the set switching information to correspond to a predetermined I / O pin of the LSI, thereby enabling the LSI to perform communication. It is possible to suppress an increase in the number of I / O pins and mount it on an inexpensive LSI package with a small number of pins. In particular, a communication LS having communication control means corresponding to at least one communication protocol of an information network and a communication protocol of a control network.
Effective for I.

[0008] Further, the present invention achieves the above object,
The following configuration was adopted. The switching information setting means is provided outside the communication LSI, and sets the switching information from outside the communication LSI.

The selecting means reads the switching information stored in the switching information setting means in advance when the computer system including the communication LSI is started up, and switches the communication control means based on the read switching information. And

Further, the selection means switches the communication control means based on control of a program for setting the switching information stored in the switching information setting means in advance.

The selection means selects the communication control means based on a result of the communication control means determining the type of a communication line connected to the communication LSI when the computer system including the communication LSI is started up. It is characterized by the following.

Further, the selection means selects the communication control means based on switching information set in advance by the switching information setting means connected to the communication LSI control device via a communication line.

Further, the present invention has the following configuration to achieve the above object. In a distributed control network system, a control client connected to a first communication network by a first communication protocol; a plurality of event-driven distributed control microcomputers connected to a second communication network by a second communication protocol; A local control server connected to the first communication network by the first communication protocol and controlling the distributed control microcomputer via the second communication network by the second communication protocol; A communication LSI control device, wherein the communication LSI control device includes the first and second communication LSI control devices.
Communication control means for controlling communication, corresponding to the communication protocol, switching information setting means for setting switching information for switching the communication control means, and the communication control means based on the switching information set by the switching information setting means And selecting means for switching the selected communication control means to correspond to predetermined input / output pins of the communication LSI.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a schematic configuration diagram showing a general structure of a computer according to a first embodiment of the present invention.
The LSI 201 is an LSI including a plurality of communication controllers and a CPU. The LSI 201 is built in a computer system or the like that connects to communication networks 225, 227, and 229 such as a network and communicates with the outside.

The CPU 202 controls the processing of each component in the LSI. The ROM controller 203 controls a 2-channel ROM. RAM controller 204
Controls the two-channel RAM.

The communication controllers 205 to 208 are controllers for controlling communication. Here, four types of communication protocols (for example, Ethernet, TCP / IP, ISDN, and LONTALK) are used.
Etc.). Of these, Ethernet, TCP / IP, IS
DN supports the communication protocol of the information network, and LONTALK supports the communication protocol of the control network.

The selection circuit 209 is connected to the communication controller 20
Two communication controllers out of 5 to 207 are selected. For example, in the case of a distributed control system in which a global control server and a local control server are connected via the Internet, and the local control server is connected to a plurality of control nodes via a control network such as LONTALK, The communication controller for TCP / IP and the communication controller for LONTALK are selected. The selection circuits 210 and 211 switch between the ROM controller 203 and the RAM controller 204 and the communication controller 208.

The control logic 212 is based on switching information from a switching circuit 215, which will be described later, and
9 to the communication controllers 205 and 20.
6 and 207, two communication controllers are selected. Further, the control logic 212 gives selection information to the selection circuits 210 and 211, and
03, the RAM controller 204, and the communication controller 208.

The switch circuit 215 is a manual switch provided outside the LSI 201,
The switching information of 9, 210, and 211 is output to the control logic 212 via a predetermined input pin of the LSI 201.

The signal line 216 is used to notify information from the control logic 212 to the selection circuit 209. The signal line 217 is used to notify information from the control logic 212 to the selection circuits 210 and 211. Signal line 2
18 is a communication controller 205, 206, 207, 2
08 to inform the control logic 212 of the information obtained.

The transceivers 219, 220, 221
The LSI 201 is connected to a communication line. ROM 222 is
As described later, a switching program executed by the CPU 202 is stored. The RAM 223 functions as a system memory.

The bus 224 is connected to the communication controller 205,
206, 207, 208, CPU 202, ROM controller 203, and RAM controller 204 are connected, and information is transferred between them.

The LSI 201 has 205, 206, 20
Four types of communication controllers 7 and 208 are built in. Of the communication controllers 205, 206, 207, 2
The base is selected by the selection circuit 209 and is connected to a predetermined I / O pin of the LSI 201.

The ROM / RAM controller 20
Reference numerals 3 and 204 denote communication controllers 2 for one channel.
08 and switching can be used. These switching controls are performed by the control logic 212. This switching is performed before using the communication controller.

In the embodiment shown in FIG. 1 configured as described above, switching information is set by a switch 215 external to the LSI 201. The output of the switch 215 is output to the control logic 212 in the LSI 201 via a predetermined input pin.

The processing operation of the first embodiment will be described in detail with reference to the flowchart of FIG. Switching information (communication controllers 205, 206, 2
07 and identification data for identifying any one of the ROM controller 203, the RAM controller 204, and the communication controller 208 (step A1). The switching information set in the switch 215 is L
Control logic 21 via a predetermined input pin of SI 201
2 is input. The control logic 212 includes the switch 21
Communication controller 20 based on the switching information from
The control circuit 209 outputs control information to the selection circuit 209 so as to select two of the ROM controllers 203, 206, and 207, and selects the one of the ROM controller 203, the RAM controller 204, and the communication controller 208. , 211 (step A2). The selection circuit 209 selects two of the communication controllers 205, 206, and 207 based on the supplied control information, and selects the communication controllers 205 and 206.
Reference numeral 11 selects a designated circuit from the ROM controller 203, the RAM controller 204, and the communication controller 208 (step A3). (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS.

In the second embodiment, the switching information is set in the ROM 214 connected to the outside of the
The control logic 212 in 01 reads the switching information stored in the ROM 214 via a predetermined input pin and performs switching. A ROM having a small number of I / O pins, such as a serial ROM, is used as the ROM 214. When the system including the LSI 201 starts up, the control logic 212
The switching information is read from the OM 214 and switching is performed.

The processing operation of the second embodiment will be described in detail with reference to the flowchart of FIG. The switching information is set in the ROM 214 in advance (step B1). This switching information is read by the control logic 212 when the system is started up (step B2).

Based on the read switching information, the control logic 212 communicates with the communication controllers 205, 206, and 207.
Control information is output to the selection circuit 209 so as to select two of them, and the ROM controller 203, R
AM controller 204 and communication controller 208
Select circuits 210 and 2 so as to select one of
11 is output to the control information (step B3). According to this selection information, the selection circuit 209 causes the communication controller 20
5, 206, and 207 are selected, and the selection circuit 21
0 and 211 select a specified circuit from the ROM controller 203, the RAM controller 204, and the communication controller 208 (step B4). Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.

In the third embodiment, a ROM (or EPROM) 213 is built in the LSI 201, and switching information is stored in advance. When the system including the LSI 201 is started up, the control logic 212
Then, the switching information is read out from 3 and switching is performed.

When manufacturing the LSI 201, the ROM 213
By setting different communication controllers to
A plurality of LSIs having different functions can be produced by using different types of LSIs.

The details of the processing operation will be described with reference to the flowchart of FIG. The switching information is set in the ROM 213 in advance (step C1). This switching information is read by the control logic 212 when the system is started up (step C2).

Based on the read switching information, the control logic 212 communicates with the communication controllers 205, 206, and 207.
Control information is output to the selection circuit 209 so as to select two of them, and the ROM controller 203, R
AM controller 204 and communication controller 208
Select circuits 210 and 2 so as to select one of
11 is output to the control information (step C3). According to this selection information, the selection circuit 209 causes the communication controller 20
5, 206, and 207 are selected, and the selection circuit 21
0 and 211 select a designated circuit from the ROM controller 203, the RAM controller 204, and the communication controller 208 (step C4). (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS.

In the fourth embodiment, switching is performed by the CPU 202 incorporated in the LSI 201 executing a predetermined switching control program. The switching information at this time is specified by a control program stored in the external ROM 222. The switching timing is LS
This is when the system including the I201 is started up or when it is determined that software is necessary.

The details of the processing operation of the fourth embodiment will be described with reference to the flowchart of FIG. The CPU 202
The control logic 212 is controlled based on the program stored in the ROM 222 (step D1). Next, CP
U202 is a communication controller 205, 206, 207 and ROM controller 2 based on the program.
03, it is determined whether switching of the RAM controller 204 and the communication controller 208 is necessary (step D2). This determination is made as follows. LSI2
01 is what transceiver 219, 220, 22
It is unknown whether 1 is connected. Therefore, for example, when it is determined whether or not switching is required among the communication controllers 205, 206, and 207, first, the first two, that is, the communication controllers 205 and 206 are temporarily selected, and the transceiver 219 connected to the outside is selected. , 220, that is, whether the data can be read correctly. If it cannot be read correctly, it is determined that switching is necessary.

When it is determined that the communication controller needs to be switched (Yes in step D2), the control logic 212 selects the selection circuit 209 based on the determination result of the program.
, Control information is output so as to select the communication controllers 206 and 207 (step D3). The selection circuit 209 selects the communication controllers 206 and 207 based on the control information (step D4). Then, the determination in step D2 is performed. Steps D2, D3, and D4 described above are repeated until compatibility with the externally connected transceiver is obtained. (Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIGS.

In the fifth embodiment, when the system including the LSI 201 is started, the type of the connected line is determined by the communication controllers 205 to 208, and the result is notified to the control logic 212 via the signal line 218. . This automatically switches to use the communication controller corresponding to the connected line.

The processing operation of the fifth embodiment will be described in detail with reference to FIG. When starting up the system including the LSI 201, the communication controller 2
05 to 208 are determined (step E1). The communication controller notifies the control logic 212 of this determination result (step E2).

The control logic 212 outputs control information to the selection circuits 209, 210, 211 based on the determination result (step E3). The selection circuits 209, 210, and 211 determine the communication controller 20 based on the given control information.
5, 206, 207, 208, ROM controller 20
3. The designated circuit of the RAM controller 204 is selected (step E4). Sixth Embodiment In each of the above embodiments, the switching information is specified by a switch or stored in a memory in advance. However, in the sixth embodiment shown in FIG. It has all of a ROM 214, a built-in ROM 213, and a program ROM 222, and is configured to switch according to an application. Note that the switching operation is the same as the above-described operation, and a description thereof will be omitted. (Seventh Embodiment) Next, a seventh embodiment will be described with reference to FIG.

In the seventh embodiment, switching information is set outside the LSI, the switching information is transmitted via a communication line, and switching is performed. The control method includes a method of notifying the CPU 202 of the switching information via the communication controller and moving the control logic 212, and a method of notifying the switching information directly from the communication controller to the control logic 212.

FIG. 12 shows a method of setting the switching information via the communication line. A ROM 301 stores switching information of all LSIs used in the system.
And through the communication line 310, the LSIs 303 to 30
5 is notified of the switching information. Transceivers 306-3
Reference numeral 09 connects the communication line 310 to the LSIs 303 to 305. By using only one piece of switching information, system management can be facilitated. System changes can be easily handled. (Eighth Embodiment) FIG. 13 is a block diagram showing an example of a distributed control network system. As shown in the figure, a global control server 401 and control clients 403, 405, and 407 are connected to an information network 409. The information network 409 is, for example, the Internet, an intranet,
AN (Wide Area Network), LAN (Local Area Network)
k) and the like, and a communication protocol such as TCP / IP is adopted. Further, local control servers 411 and 413 are connected to the information network 409.
The local control servers 411 and 413 are respectively connected to control system networks 419 and 421 such as LONworks Network developed by Echelon, USA. The local control servers 411 and 413 incorporate communication LSIs 415 and 417, respectively. The communication LSIs 415 and 417 enable communication with the information network 409, respectively.
Enable communication with rk.

Control nodes 423 and 425 and a machine 431 are connected to the control system network 419. The control nodes 423 and 425 are connected to the communication LSIs 427 and
29 are built in. The control node is machine 4
33 and 435, respectively, and the machines 433 and 43
5 is controlled. The machines 431, 433, and 435 are, for example, sensors and actuators (lighting, switches, motors, and the like)
It consists of. The communication LSIs 427 and 429 are LONwor
Enables communication with the local control server via ks Network.

Similarly, a control node 437 and machines 441 and 443 are connected to the control system network 417. The control node 437 incorporates a communication LSI 439. The control node 439 is further connected to the machines 445 and 447, respectively, and controls the machines 445 and 447.
Each of the machines 441, 443, 445, and 447 includes, for example, a sensor or an actuator (light, switch, motor, or the like). The communication LSI 439 enables communication with the local control server via the LONworks Network.

The communication LSIs 415, 417, 42
7, 425 and 439 are a control network adopting a dedicated communication protocol such as LONworks Network and Et.
An electronic circuit applied to a gateway for connecting to an information network employing a standard communication protocol such as hernet or TCP / IP, and control nodes 423 and 42 for monitoring and driving sensors and actuators.
5 and 437. As shown in FIG. 14, the CPU 101, the Ethernet controller 106a, the LON controller 105, and the processor I / O
O controller 107, CHI controller 106f, and arbiter 108 are connected via bus 103
It is an electronic circuit formed into a chip.

The CPU 101 processes information for protocol conversion and device control, and includes a DMA controller, a DRAM controller, a ROM controller, an interrupt controller, a serial I / O, a parallel I / O, and a timer / counter. Have.

The Ethernet controller 106a
Is a communication controller that controls data transmission and reception via the Ethernet. The LON controller 105
It is a communication controller that controls data transmission and reception via LON. The processor I / O controller 107 is a communication controller for monitoring and controlling sensors, actuators, and the like. CHI controller 106f
Is a communication controller that controls data transmission and reception via the WAN. And the arbiter 108 is the CPU 101
And each communication controller (106a, 105, 107, 1)
06f).

The communication LSIs 415, 417,
A switching device 109 is provided in each of 427, 429, and 439, and the switching device 109 selects a communication controller to be effectively operated from a plurality of communication controllers. Specifically, when applied to the local control servers 411 and 413, Ethernet
et controller 106a (information network 2 is E
the LON controller 10)
5 or the CHI controller 106f (when the information network 2 is a WAN) and the LON controller 1
05 is selected and applied to the control nodes 423, 425, and 439, the LON controller 105 and the processor I / O controller 107 are selected.

The switching device 109 includes an input pin 110
A communication controller to be made to function effectively among a plurality of communication controllers based on a signal input from the communication controller. At this time, each communication controller (106a,
105, 107, and 106f) switch the I / O signal pins used. With this configuration, the eighth
In the embodiment, the communication LSIs 415, 417, 42
7, 429, and 439 are commonly applicable to the network devices (local control servers 411, 413, and control nodes 423, 425, and 437) shown in FIG.

The CPU 1 of the communication LSI 100
01 is an information network 40 for processing information for protocol conversion and device control.
9 (the global control server 401 and the control clients 403, 405, and 4).
07) is created in the same general-purpose programming language as a program operating on the same, for example, Java or the like.
Thus, for example, as shown in FIG. 15, the control network 409 and the information networks 419 and 421 can be integrated at the software level, and the global control server 401, the control clients 403 and 405, and the local control server 411 can be integrated. , 413 and control nodes 423, 425, 437
Can communicate with each other in the same procedure, and the global control server 401 and the control client 4
Control nodes 423, 42 from 03, 405, etc.
It is possible to seamlessly connect up to 5,437.

[0050]

As described above in detail, according to the present invention, a large number of communication controllers are built in an LSI and are switched according to the system to be used. Provision is possible.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating a switching operation of the communication controller according to the first embodiment.

FIG. 3 is a block diagram showing a configuration of a communication LSI according to a second embodiment of the present invention.

FIG. 4 is a flowchart illustrating a switching operation of a communication controller according to the second embodiment.

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

FIG. 6 is a flowchart illustrating a switching operation of a communication controller according to a third embodiment.

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

FIG. 8 is a flowchart illustrating a switching operation of a communication controller according to a fourth embodiment.

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

FIG. 10 is a flowchart illustrating a switching operation of a communication controller according to a fifth embodiment.

FIG. 11 is a communication LSI according to a sixth embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 12 is a communication LSI according to a seventh embodiment of the present invention;
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 13 is a block diagram of a distributed control network system according to an eighth embodiment of the present invention.

14 is a detailed block diagram of a communication LSI used in the distributed control network system shown in FIG.

FIG. 15 is a conceptual diagram showing how a control network and an information network according to the eighth embodiment are integrated at a software level.

[Explanation of symbols]

 201 LSI 202 CPU 203 ROM controller 204 RAM controller 205 Communication controller 206 Communication controller 207 Communication controller 208 Communication controller 209 Selection circuit 210 Selection circuit 211 Selection circuit 212 Control logic 213 ROM 214 ... ROM 215 ... Switch 216 ... Signal line 217 ... Signal line 218 ... Signal line 219 ... Transceiver 220 ... Transceiver 221 ... Transceiver 222 ... ROM 223 ... RAM 224 ... Bus 225 227 229 ... Network 301 ... ROM 302 ... LSI 303 ... LSI 304 ... LSI 305 ... LSI 306 ... Transceiver 307 ... Transceiver 308 ... Transceiver 309 ... Transceiver 310 ... Communication line

Claims (18)

[Claims] 1. A communication LSI control device for controlling a communication LSI, comprising: communication control means for controlling communication in accordance with a plurality of different communication protocols; and switching information for setting switching information for selecting the communication control means. Setting means; and selecting means for selecting the communication control means based on the switching information set by the switching information setting means, and switching the selected communication control means to correspond to predetermined input / output pins of the communication LSI. An LSI control device for communication, comprising: 2. The communication apparatus according to claim 1, wherein the switching information setting means is configured to control the communication L.
The switching information is provided outside the SI, and the setting of the switching information is performed by the communication LS.
2. The communication LSI control device according to claim 1, wherein the control is performed from outside of I. 3. The switching means reads the switching information stored in the switching information setting means at the time of starting up a computer system including the communication LSI, and switches the communication control means based on the read switching information. 3. The communication LSI control device according to claim 2, wherein: 4. The switching means reads the switching information stored in advance in the switching information setting means at the time of starting up a computer system including the communication LSI, and switches the communication control means based on the read switching information. 2. The communication LSI control device according to claim 1, wherein: 5. The communication apparatus according to claim 1, wherein said selection means switches said communication control means based on control of a program for setting said switching information stored in said switching information setting means in advance. LSI control device. 6. The communication control means according to claim 1, wherein said communication control means determines a type of a communication line connected to said communication LSI when a computer system including said communication LSI is started up. 2. The communication LSI control device according to claim 1, wherein the communication LSI control device is selected. 7. The communication device according to claim 1, wherein the selection unit selects the communication control unit based on switching information preset in the switching information setting unit connected to the communication LSI control device via a communication line. The communication LSI control device according to claim 2. 8. The plurality of different communication protocols,
2. The communication LSI controller according to claim 1, wherein the communication LSI controller is a communication protocol of at least one information network and a communication protocol of a control network. 9. Communication for controlling a communication LSI comprising communication control means for controlling communication in accordance with a plurality of different communication protocols, and switching information setting means for setting switching information for selecting the communication control means. A communication control method of the communication LSI control device, wherein the communication control means is selected based on the switching information, and the selected communication control means is switched so as to correspond to a predetermined I / O pin of the communication LSI. Communication control method. 10. The switching information setting means is provided outside the communication LSI, and sets the switching information in the communication LSI.
The communication control method according to claim 9, wherein the communication control is performed from outside the SI. 11. The switching information stored in advance in the switching information setting means is read out at the time of starting up a computer system including the communication LSI, and the communication control means is switched based on the read out switching information. The communication control method according to claim 10. 12. The switching information stored in advance in the switching information setting means is read out at the time of starting up a computer system including the communication LSI, and the communication control means is switched based on the read out switching information. The communication control method according to claim 9. 13. The communication control method according to claim 9, wherein said communication control means is switched based on control of a program for setting said switching information stored in said switching information setting means in advance. 14. The communication control means is selected based on a result of the communication control means determining a type of a communication line connected to the communication LSI when a computer system including the communication LSI is started up. The communication control method according to claim 9, wherein 15. The communication control unit according to claim 10, wherein the communication control unit is selected based on switching information set in advance in the switching information setting unit connected to the communication LSI control device via a communication line. Communication control method. 16. The communication control method according to claim 9, wherein said plurality of different communication protocols are a communication protocol of at least one information network and a communication protocol of a control network. 17. A control client connected to a first communication network by a first communication protocol; a plurality of event-driven distributed control microcomputers connected to a second communication network by a second communication protocol; A local control server connected to said first communication network by a first communication protocol and controlling said distributed control microcomputer via said second communication network by said second communication protocol, A communication control unit that controls communication in accordance with the first and second communication protocols, and a switch that sets switching information for switching the communication control unit. Information setting means, and setting by the switching information setting means Selection means for selecting the communication control means based on the selected switching information, and switching the selected communication control means to correspond to predetermined input / output pins of the communication LSI. Network system. 18. The distributed communication system according to claim 17, wherein said first communication protocol is a communication protocol of at least one information network, and said second communication protocol is a communication protocol of a control network. Control network system.