JP2001251346A - Data transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of a conventional data transmission system employing a protocol converter that has deteriorated reply performance because analysis processing is performed always even for a simple communication processing such as data transmission/reception and that has targetted only the serial communication for an interface of a 2nd communication channel. SOLUTION: Two communication connections 502, 503 are prepared for a transmission channel (1st communication channel) so as to divide communication connections into a communication connection for a control instruction processing and a communication connection for a data transmission/reception processing. A relay unit 200 (2nd computer) omits analysis processing of information received from the communication connection 503 for the data transmission reception. Thus, the entire processing performance of the relay unit 200 and the data transmission system can be enhanced. Furthermore, a communication interface between a facility unit 300 and the relay unit 200 is not restricted and a facility coordination processing section 202 in correspondence to a connected facility is prepared so as to be compatible with a multi-protocol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication line connecting a first computer and a second computer having a plurality of communication connections, and selecting a communication connection according to the intended use of the information to be communicated. It relates to a data transmission system. Also, for example, a non-TCP
For equipment that supports the / IP communication protocol, different types of data communication processing from a first computer that supports a TCP / IP communication protocol such as a personal computer or a workstation as the first communication protocol are enabled. The present invention relates to a data transmission system between communication protocols.

[0002]

2. Description of the Related Art Conventionally, when a facility control device equipped with an application for performing operations for maintenance, monitoring, management, and the like accesses a facility device such as a control device used in a production line of a factory, a serial control is required. Control such as maintenance and monitoring has been performed by directly connecting the equipment control device and the equipment device using a communication interface or a communication interface developed independently. However, with the development of network technology in recent years, attempts have been made to access the facility equipment remotely using a TCP / IP network such as an intranet or the Internet. Conventional methods related to the present invention include:
For example, “Data transmission method” (Japanese Patent Laid-Open No. 10-23382)
0) has been proposed. This is LAN
(Local Area Network) This is a system that connects a LAN system and a serial terminal system to perform communication control by placing a device that performs protocol conversion between a host computer operating on a (Local Area Network) and a serial terminal.

FIG. 16 is a diagram showing a configuration of a data transmission system in which communication between a LAN system and a serial terminal is controlled via a conventional protocol converter. Host 150
1 and the protocol converter 1502 are connected by the LAN 1507, and the protocol converter 1502 and the serial terminal 1503 are connected by the data line 1508 of the serial transmission line. From the host 1501, the serial terminal 15
03 is encapsulated in a TCP / IP header, and the protocol converter 15
02. After the transmitted data is received by the LAN port 1504, the control function unit 1505 performs signal control on the serial transmission line 1509,
It is analyzed whether character data is transmitted to the serial transmission line 1509. The received data is processed based on the result of the analysis, and signal control of the serial transmission line 1509 and transmission of the character data to the serial terminal 1503 are performed through the serial port 1506. In addition, the serial transmission path 1
When character data is transmitted through 509, the character data is encapsulated in a TCP / IP header by the control function unit 1505, and is passed from the LAN port 1504 to the host 1501 via the LAN 1507.

[0004]

The conventional data transmission method by the protocol converter performs the processing as described above. Even in a simple communication processing such as data transmission / reception, information for controlling a signal is used. The analysis process is always performed to determine which one of the information for transmitting the character data is transmitted from the host.
Therefore, there is a problem that the response performance is deteriorated due to the influence of the analysis processing in the control function unit. Further, only serial communication is considered as an interface of the equipment device to be controlled, and there is a problem that the control devices on the host side that can be connected thereto are limited.

Further, since recovery processing in the event of a communication failure between the host and the protocol converter is not considered, even if a communication failure occurs between the host and the protocol converter, the processing between the host and the protocol converter can be performed. After interrupting and reconnecting, there is a problem that processing must be restarted from the beginning.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and at least two communication lines are required for a first communication line.
An object of the present invention is to improve the processing performance by preparing two communication connections and separating the communication connections used for the control command processing and the data transmission / reception processing, particularly by omitting the analysis processing in the data transmission / reception processing. For the communication interface on the equipment side,
The purpose is to enable multi-protocol support without any particular limitation. Furthermore, even when a communication failure occurs, the communication processing can be continued by substituting a normally operating communication connection, or the recovery processing (reconnection) can be automatically performed by detecting the cause of the failure. .

[0007]

A data transmission system according to the present invention includes a first computer and a second computer connected by a first communication line, wherein the first computer and the second computer are connected to each other. In a data transmission system for communicating information with a computer via the first communication line,
The information communicated between this computer and the second computer is:
The first communication line has a plurality of purpose applications, the first communication line has a communication connection for each of the plurality of purpose applications, and the first computer has a first connection corresponding to the plurality of purpose applications of the information. A message conversion unit for transmitting the information to the second computer using the communication connection of the communication line.

Also, in the data transmission system according to the present invention, the first communication line communicates information according to a first communication protocol, and the data transmission system further includes the second computer and the first computer. A second communication line different from the first communication protocol, and the second computer and the equipment device are connected to the second communication line via the second communication line. The information communicated by the communication protocol of the first computer and the information communicated between the second computer, the first computer to the equipment device using the second computer as a relay device The first computer comprises an equipment control application for generating the processing request information, and the message conversion unit A command for inputting the processing request information generated by the application, converting the processing request information into processing identification information for identifying the processing requested by the processing request information, and transmitting the processing identification information to the second computer; A generating unit, wherein the second computer analyzes the process identification information transmitted from the command generating unit, converts the process identification information into information for requesting the equipment apparatus to perform processing, and
And a facility cooperation processing unit for transmitting to the facility apparatus using the communication protocol.

Further, in the data transmission system according to the present invention, the processing request information may include a group of a plurality of processes related to the equipment from the first computer.
Group processing request information to request as one process,
The facility cooperation processing unit analyzes the group processing request information of the processing request information, acquires a plurality of related processes indicated by the group processing request information, and obtains a plurality of the facility devices from the acquired processes. And generating information for requesting a process to the plurality of facility devices, and transmitting the generated information for requesting the process to the plurality of facility devices in a lump.

Further, the data transmission system according to the present invention further comprises a group processing function management warehouse which stores the group processing request information and a plurality of related processes indicated by the group processing request information in advance. And the second computer connected to the second computer.
The group processing function management device is accessed from the computer of the group processing function management warehouse, and the equipment cooperation processing unit is configured to execute the group processing function management device based on the group processing request information of the equipment information. The processing function management warehouse is accessed to acquire a plurality of related processes indicated by the group process request information.

Further, in the data transmission system according to the present invention, the first computer requests the second computer to re-execute communication of the information with the first computer which has already been executed. A retransmission request processing unit that performs the retransmission request processing.

Further, in the data transmission system according to the present invention, the message conversion unit receives a failure notification of a failure occurring in the communication connection from each of the plurality of purpose-specific communication connections of the first communication line. A first failure detection unit, and a normally operable communication connection obtained from the plurality of communication connections based on the failure notification received by the first failure detection unit. And a first communication proxy processing unit for proxying the communication connection in which the failure has occurred.

[0013] In the data transmission system according to the present invention, the second computer receives a failure notification of a failure occurring in the communication connection from each of the plurality of purpose-specific communication connections of the first communication line. A second fault detecting unit that performs a normal operation and obtains a normally operable communication connection from the plurality of communication connections based on the fault notification received by the second fault detecting unit. A second communication proxy processing unit for proxying the communication connection in which the failure has occurred.

Further, in the data transmission system according to the present invention, the second computer manages a communication state of each of a plurality of purpose-specific communication connections of the first communication line, and indicates a communication state. A status management unit for storing information; wherein the message conversion unit has received the notification of a failure occurring in the communication connection from the first failure detection unit, and the failure has occurred in the state management unit. A failure cause investigator requesting the second computer to acquire the state information of the communication connection; and a failure cause investigation part based on the state information acquired from the failure cause investigation part. And a reconnection processing unit for requesting connection connection again.

Further, a data transmission system according to the present invention includes a first computer and a second computer connected by a first communication line, wherein a first computer and a second computer are connected between the first computer and the second computer. In the data transmission system for performing information communication by using the first computer, the first computer associates line information indicating the type of the first communication line with communication protocol information indicating a communication protocol usable in the communication line. A protocol information table to be stored; and a line identification information input unit for inputting line identification information for identifying the first communication line, and acquiring communication protocol information from the protocol information table based on the input line identification information; A first computer and a second computer adapted to the communication protocol indicated by the communication protocol information acquired by the line identification information input unit; Characterized by comprising a message conversion unit for converting the information to be communicated between.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a main configuration of a system according to the present embodiment. FIG. 2 shows an internal structure of data transmitted and received between the computer 100 and the relay device 200. FIG. 3 is an example of a communication control processing information table that stores processing request information requested from the facility control application and processing identification information corresponding to the processing request information.

In FIG. 1, a first computer is a computer 10
0, the second computer is the repeater 200, and the equipment is the equipment 300. The first communication line is a transmission line 500, and the second communication line is a transmission line 501.
First, the configuration of the computer 100 will be described. 101 is equipment 3
The facility control application 102 generates processing request information for performing access for requesting processing such as maintenance, monitoring, and control of the processing control information. A message conversion unit for converting data for IP communication, a socket interface unit for inputting / outputting TCP / IP data transferred between the computer 100 and the relay device 200, and a facility control application 1 for 104
The command generation unit 105 generates and transmits a signal control command, which is one of the processing request information, in accordance with the processing request information from 01. Request data, which is one of the processing request information generated by the facility control application 101 And
The data transfer unit receives response data from the equipment 300. Next, the configuration of the relay device 200 will be described. 201 is TCP which is processing request information transferred from the computer 100.
The message analysis unit 202 that analyzes the / IP data, the equipment 202 according to the analysis result by the message analysis unit 201
0, a socket interface unit for inputting / outputting TCP / IP data transferred between the repeater 200 and the computer 100 and the facility 300, and 204 a transfer between the repeater 200 and the facility 300. Communication interface for equipment to send and receive data
205 is a command analysis unit that analyzes data transmitted from the command generation unit 104 of the computer 100; 206 is data that receives and analyzes data transferred from the data transfer unit 105 of the computer 100 and transmits response data from the equipment 300 It is an analysis unit. Next, the computer 100 is connected to the repeater 200.
A transmission line connecting the relay device 200 and the equipment 300 will be described. 500 is a computer 100
A transmission line for transmitting and receiving TCP / IP data between the relay device 200 and the relay device 200, and a transmission line 501 for transmitting and receiving data between the relay device 200 and the equipment 300. A control communication connection 502 connects the command generation unit 104 and the command analysis unit 205 through the socket interface units 103 and 203, and a data connection unit 503 connects the data transfer unit 105 and the data analysis unit 206 through the socket interface units 103 and 203. This is a communication connection for transmission and reception. A network having a data structure and a communication protocol necessary for connecting the repeater and the equipment to enable data communication is called a network for equipment. Repeater 2
Data transferred between 00 and the equipment 300 is referred to as equipment-oriented network data. In the first embodiment, the computer 10
The purpose of the information communicated between the communication device 0 and the relay device 200 is two types. One is control information for controlling the equipment 300 or the transmission line 501, and the other is from the computer 100. The transmission data is intended to transmit data to the facility 300. The control data is transmitted from the computer 100 to the relay device 200 via the control communication connection 502, and the transmission data is transmitted to the computer 1 via the data transmission / reception communication connection 503.
00 and the relay device 200 are to be communicated.

In FIG. 2, reference numeral 3010 denotes request data generated by the command generation unit 104, and 3011 denotes TC
A P / IP header portion, 3012 is a command ID portion for storing a communication control command, and 3013 is an attached data portion for storing data attached to the command ID. Reference numeral 3020 denotes request data generated by the data transfer unit 105;
Reference numeral 1 denotes a TCP / IP header, and 3022 denotes a request data generated by the facility control application. 3030
Is a response data generated by the message analysis unit 102, 3031 is a TCP / IP header part, and 3032 is a response data part. In FIG. 3, 4000 is an example showing a control command information table, 4001 is a communication control command, and 4002 is a command ID. The control command information table 4000 is a table provided in the command generation unit 104 of FIG.

Next, the operation will be described. In the present embodiment, as an example of realizing data communication between the computer 100 supporting the TCP / IP communication protocol and the facility 300 supporting a communication protocol other than the TCP / IP communication protocol, an intermediary process between the computer 100 and the facility 300 is performed. Is installed, and communication processing between the computer 100 and the repeater 200 is performed using the communication connections 502 and 503 prepared for each application. The following two types of access from the facility control application 101 to the facility 300 are assumed. (1) Data transmission / reception processing A control command or a control program generated by the equipment control application 101 is transferred to the equipment 300, or a processing result or a control program is loaded from the equipment 300. (2) Communication control processing The communication control processing for opening and closing the communication line to the equipment 300 and the signal control processing seen in the case of serial communication are executed. In the present invention, in order to respond to the processing requirements for the above different purposes,
As shown in FIG. 1, two communication connections, a control communication connection 502 and a data transmission / reception communication connection 503, are prepared between the computer 100 and the relay device 200.
It is characterized by adopting a method of distinguishing a communication connection to be used according to the type of access. In accordance with an instruction from the facility control application 101, the message conversion unit 1
In 02, either the control communication connection 502 or the data transmission / reception communication connection 503 is selected, and communication processing is performed. The processing request from the facility control application 101 to the message conversion unit 102 is always serialized and issued, and the control communication connection 502 and the data transmission / reception communication connection 503 are not used in parallel. Hereinafter, a procedure for each processing request of the data transmission / reception processing and the communication control processing will be described.

First, a processing procedure for data transmission / reception processing will be described. The equipment control application 101 of the computer 100 generates control commands and control program data depending on the equipment network.
A transmission request for 0 is issued. For example, when a command to transmit data of the control program is issued, the data transfer unit 105 of the message conversion unit 102 receives the data of the control program and sends the received data to the socket interface unit 10.
3 and the data transmission / reception communication connection 503 to the repeater 200 side. At this time, the content transmitted is TCP / I
The control program data is attached to the request data part 3022 after the P header 3021, and the request data 302
Generated as 0. In the relay device 200, the data analysis unit 206 of the message analysis unit 201 transmits the request data 3020 through the socket interface unit 203.
To receive. In the socket interface unit 203, T
The CP / IP header is removed, and the request data
Is passed to the message analysis unit 201 only. Message analysis unit 201
The data analysis unit 206 transfers the data of the control program to the facility cooperation processing unit 202. Equipment cooperation processing unit 202
Means that there is a facility network unit, that is, if there are a plurality of facilities 300, there is a facility cooperation processing unit 202 corresponding to each facility 300, and each facility cooperation processing unit 202 Aware of networks for Equipment cooperation processing unit 202
Is the communication interface 204 for equipment and the transmission path 5
01 to the equipment 300
Send to The data analysis unit 206 receives the transmission result from the equipment 300 through the equipment cooperation processing unit 202, and returns the processing result to the computer 100 through the socket interface unit 203 and the data transmission / reception communication connection 503 as the processing result. The socket interface unit 203 generates the response data 3030 by storing the transmission result in the response data unit 3032 of the response data. Computer 10
0, the data transfer unit 105 acquires the response data (actually, only the transmission result extracted from the response data unit 3032 by the socket interface unit 103).
The processing result is returned to the equipment control application 101.

Subsequently, a processing procedure for the communication control processing will be described. For example, when a serial interface is used as a communication interface to the equipment 300, there are signal control processes different from TCP / IP, such as a serial line opening / closing process and a change in line transmission speed.
In the present invention, in order to instruct a signal control command via TCP / IP, a control command processing method using a command ID as shown in FIG. 3 is employed. When a control command is issued from the equipment control application 101, the command generation unit 104 of the message conversion unit 102 controls the control command information table 4000.
, The command ID corresponding to the control command is determined. The command ID is attached after the TCP / IP header 3011 by the socket interface unit 103, and is sent as the request data 3010 to the control communication connection 5.
02 to the repeater 200. The request data 3010 can be transmitted by storing control data such as a transmission speed, a parity setting, and a communication timeout time required for control processing in an attached data part 3013 of the request data. In the relay device 200, the command analysis unit 205 of the message analysis unit 201 receives the command ID (actually, the command ID is extracted from the request data 3010 in the socket interface unit 203) through the socket interface unit 203, and the facility cooperation processing unit Hand over to 202. Equipment cooperation processing unit 20
2 is converted into a facility communication control command according to the command ID and issued from the facility communication interface unit 204. The processing result for the control command is returned from the facility cooperation processing unit 202 to the command analysis unit 205 of the message analysis unit 201, and is transmitted to the computer 100 via the socket interface unit 203 and the control communication connection 502.
Sent to. In the computer 100, the command generation unit 104 of the message conversion unit 102 receives a processing result for the control command through the socket interface unit 103 and the control communication connection 502, and returns the processing result to the facility control application 101.

As described above, according to the first embodiment, the network data for the equipment is stored in the TCP / IP data and transferred, so that the network data via the TCP / IP communication protocol is independent of the communication protocol of the equipment 300. Can be accessed remotely. In addition, by processing a control instruction specialized for a communication protocol as a command ID, the communication protocol of the equipment 300 is not conscious (it is said that the communication protocol of the equipment 300 is not conscious. Equipment cooperation processing unit 20
2 is aware of the communication protocol of each of the plurality of facilities 300 connected to the repeater 200, so that it is not necessary to be aware of the communication protocol of the facility 300). Communication control processing can be realized. Further, by dividing the communication connection for data transmission / reception processing and the communication control processing and omitting the command analysis processing at the time of data transmission / reception processing, communication processing performance can be improved.

As described above, in the first embodiment, the computer, which is one of the equipment control devices, and the relay device are connected by the communication line for communicating information by the TCP / IP communication protocol, which is the first communication protocol. In a data transmission system in which a relay device and a facility device are connected by a communication line that communicates information according to a non-TCP / IP communication protocol that is a second communication protocol, the computer performs maintenance, monitoring, and control of the facility. A facility control application for performing access, a message conversion unit for converting a signal control command or data transmission / reception processing command, which is information for the facility from the application, into transmission data for transmission by the relay device, and a TCP between the relay device And a socket interface unit for executing IP communication. A message analysis unit for analyzing data, a facility coordination processing unit for performing signal control processing and data transmission / reception processing for the facility apparatus according to the analysis result, a socket interface unit for performing TCP / IP communication with the computer, In addition to providing an interface unit for equipment communication that performs communication processing for equipment, and having means for connecting the computer and the repeater by communication connections classified by purpose and purpose, communication with the computer regardless of the communication protocol on the equipment side An example of a data transmission system that enables data communication processing between facilities has been described.

Further, the computer includes a command generation unit for generating a general command statement in response to a signal control command from the facility control application, and the relay device transmits a communication control command for the facility from the command statement. By providing a command analysis unit to generate TCP / TCP
An example of a data transmission system that enables a computer to perform a communication control process on a remote facility via IP without being aware of the communication protocol of the facility apparatus has been described.

Embodiment 2 A second embodiment of the present invention will be described with reference to FIG. 4 and FIGS. FIG.
9 is a diagram showing an overall configuration of a data transmission system according to Embodiment 2. FIG. In FIG. 4, the computer 100 and the relay device 200 are the same as the computer 1 shown in FIG.
00 and the repeater 200. The equipment 300 is the same as the equipment 300 in FIG. Also, the transmission lines 500 and 501 in FIG.
Same as 1. The difference between FIG. 1 and FIG. 4 is that the facility cooperation processing unit 202 in FIG.
It is a point that has. FIG. 5 is a group processing function information table in which storage locations where group processing requests are stored are stored in association with group IDs corresponding to the group processing request information. The group processing request information included in the processing request information requested from the facility control application is a group ID assigned to the group processing request. The equipment cooperation processing unit 202 has a group ID
, A storage location where a plurality of related processes indicated by the group process request information is stored, and the acquired storage location is accessed to access a plurality of related processes. To get.
In FIG. 5, 5000 is an example showing a group processing function information table, 5001 is a group ID, 500
2 is an arrangement place. FIG. 6 is a flowchart showing the processing operation in the present embodiment.

The internal operation of the computer 100 and the repeater 200 in the present embodiment will be described with reference to FIG. In the present embodiment, when a certain processing pattern is present in the requested processing content in a processing request from the computer 100 to the facility 300, the processing request from the computer is relayed by grouping the processing request. The apparatus 200 performs batch processing on behalf of the apparatus. For example, when the equipment 300 supports a serial communication interface, the computer 100 or the repeater 200 transmits serial communication such as (1) open processing of a serial line, (2) notification of start of data transmission / reception, and (3) confirmation of data transmission / reception to the equipment 300. A signal control process is performed. When the processes (1) to (3) are patterned, an identifier (group ID) is added to the patterns to form a group. The grouping is performed when the processing request information is generated in advance by the facility control application 101, or the message conversion unit 1
02, the command generation unit 104 refers to the processing request information input from the facility control application 101, and if there is a processing content that can be patterned into the processing content included in the processing request information, the processing content corresponds to the processing content. Acquire the group ID and change the processing contents of the processing request information to group I
The data may be converted to D and transmitted to the computer 200. In the latter case, it is assumed that the command generation unit 104 has a table that stores a group ID corresponding to the processing content to be patterned. Equipment cooperation processing unit 2 of repeater 200
02 has a function of acquiring the processing content corresponding to the group ID (this function is called a group processing execution function). The group processing execution function may be realized by arranging the group ID and the processing content corresponding to the group ID on a memory, or storing the group ID on a disk as a library and reading it out to the memory as needed. The arrangement location of the group ID and the processing content corresponding to the group ID is managed by the group processing function information table 5000.

When the control command for the above process (1) is issued from the facility control application 101, the command generation unit 104 of the message conversion unit 102 stores the group ID corresponding to the control command in the request data 3010 (step S01). In the present embodiment, the group ID name is “proxy1”. The request data 3010 is transmitted to the relay device 200 through the socket interface unit 103 and the control communication connection 502 (step S02). In the relay device 200, the command analysis unit 205 of the message analysis unit 201 transmits the request data 30 via the socket interface unit 203.
10 is received (step S03). A group ID (“proxy1” in the present embodiment) is extracted from the received request data 3010, and the equipment cooperation processing unit 2
02 (step S04). Equipment cooperation processing unit 202
Confirms the location of the function from the group processing function information table based on the extracted group ID (step S0).
5). According to FIG. 5, the location corresponding to the group ID “proxy1” is “\ lib \ seria” of the C drive.
l. live ", the group I
Obtain a processing instruction corresponding to D. It is assumed that the processing contents indicated by the group ID are processing requests (1), (2), and (3), and communication control commands corresponding to these processing requests are issued from the facility communication interface unit 204 (step S06). ). After the processing for the control command is completed, the result of the group processing is displayed in the facility cooperation processing unit 20.
2 to the command analysis unit 205 of the message analysis unit 201
Is returned to the TC
It is attached to the P / IP header 3031 and transmitted to the computer 100 through the control communication connection 502 as response data 3030 (step S07). In the computer 100, the command generation unit 104 of the message conversion unit 102 receives the response data 3030 through the socket interface unit 103 and the control communication connection 502 (step S08), and extracts the result of the group processing (step S09). The processing result of the control command (1) is returned to the facility control application 101 (step S10). Then, equipment control application 1
When the control commands (2) and (3) are issued from 01, the control commands (2) and (3) have already been processed for the equipment 300 as related processes to the control command (1). I have. Therefore, the command generation unit 104 of the message conversion unit 102 returns a processing result from the result of the group processing according to each control processing.

As described above, according to the second embodiment,
By having a function of grouping a fixed pattern of processing groups and processing them collectively in the repeater 200,
Communication processing between the computer and the relay device is omitted, and the processing performance can be improved.

In the second embodiment, the computer is provided with group processing request means for requesting batch processing of a plurality of processing, and the repeater is provided with means for executing a group processing function for collectively processing equipment in response to the processing request. An example of the data transmission system including the above has been described.

Embodiment 3 Embodiment 3 of the present invention
A description will be given based on FIG. 5 and FIG. FIG. 7 shows a main configuration of a system according to the present embodiment. Although the embodiment described here has the configuration of FIG. 1, elements that are not directly related to the description of the present embodiment are omitted in FIG. 7 in order to simplify the drawing and understand the features. did. 7, reference numeral 401 denotes the repeater 200
The group processing function management unit accesses the group processing function management warehouse 402 based on the received group processing request information and acquires a plurality of related processes. The group processing request information is, for example, storage, search, and transfer processing. Reference numeral 402 denotes a group processing function management warehouse that stores therein group processing request information and a plurality of related processes indicated by the group processing request information. 403
Is a socket interface for inputting and outputting TCP / IP data transferred between the group processing function management device 400 and the relay device 200. Group processing function management device 40
0 is connected to the repeater 200 via the transmission line 500. In the present invention, the repeater 200 accesses the group processing function management device, and the computer 100 does not access the group processing function management device.

Next, the operation will be described. In the present embodiment, when the content of the corresponding group processing does not exist in the group processing function information table 5000 of the facility cooperation processing unit 202 in response to the execution request of the group processing indicated by the group ID from the computer 100, By acquiring the processing content indicated by the group ID, the processing can be continued. In the third embodiment, the following processing is added to step S05 in FIG. 6 of the second embodiment. In response to the group processing request from the computer 100 side, as a result of the group processing function search by the facility cooperation processing unit 202, if the corresponding group ID does not exist, the facility cooperation processing unit 202
A group processing content acquisition request is issued to the group processing function management apparatus 400 using the group ID as a key. In the group processing function management unit 401 of the group processing function management device 400, the socket interface unit 40
3, the group processing content acquisition request is received.
The group processing function management unit 401 has a group processing function information table 5000 similarly to the facility cooperation processing unit 202 of the relay device 200 (however, the group processing function management unit 4
01 has different contents from the group processing function information table 5000 included in the facility cooperation processing unit 202.
The structure of the group processing function information table 5000 is the same, but the information stored in the table is the group processing function information table 500 of the facility cooperation processing unit 202.
A group ID that does not exist in the group processing function management device 4
It is assumed that the group processing function information table 5000 of 00 has the same. ), Access the storage location where the content of the group processing is stored based on the group ID, read the content of the corresponding group processing from the group processing function management warehouse 402, and relay the relay processing through the socket interface unit 403. Reply to 200. After acquiring the contents of the group processing from the group processing function management device 400, the facility cooperation processing unit 202 of the relay device 200 continues the processing from step S06 of the second embodiment.

As described above, according to the third embodiment,
Even when the group ID indicating the corresponding group process does not exist in the relay device, the process can be continuously executed by acquiring the corresponding process content from the group process function management device in response to the request. Further, since it is not necessary to always store all the group processing functions in the repeater 200, the disk capacity and the memory capacity of the repeater can be saved. Further, by preparing the group processing function management device, it is possible to apply hardware having a limited disk capacity or memory capacity, such as an embedded device, to the repeater.

In the third embodiment, a group processing function management unit for storing, searching, and transferring group processing functions and a group processing function management device having a group processing function management warehouse for storing group processing functions are provided. Accordingly, when the group processing function corresponding to the processing request does not exist in the repeater, an example of a data transmission system that enables the processing to be continuously performed by acquiring the group processing function from the group processing function management device Was explained.

Embodiment 4 A fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 shows a main configuration of a system according to the present embodiment. Although the embodiment described here has the configuration of FIG. 1, elements that are not directly related to the description of the present embodiment are omitted in FIG. 8 in order to simplify the drawing and understand the features. did. In FIG. 8, reference numeral 106 denotes a retransmission request processing unit that determines retransmission processing of communication control processing or data transmission / reception processing for the relay device 200.

Next, the operation will be described. In the present embodiment, when a processing request is issued from the facility control application 101 of the computer 100 to the facility 300, if the processing result from the facility 300 cannot be obtained due to some problem, the message conversion unit 102 By providing a function of performing retransmission processing in a targeted manner, the processing load at the application level is reduced. The retransmission request processing unit 106 of the message conversion unit 102 sets a timeout time (the longest waiting time) in the communication processing time in advance (when the repeater 200 connects a plurality of facilities 300, the timeout time is set to each of the plurality of facilities. It is assumed that different times can be set depending on the time). The retransmission request processing unit 106 determines the number of retransmissions of request data and a retransmission interval (sleep time) as retransmission processing information in addition to the timeout time. For example, the facility control application 101 issues the following processing request to the facility 300 via the data transmission / reception communication connection. (1) Request for transmission of control command to equipment 300 (2) Request for acquisition (data reception) of the processing result for processing (1) The processing request (1) is based on the data transmission / reception processing procedure described in the first embodiment. Is transmitted from the data transfer unit 105 of the computer 100 to the facility 300 via the relay device 200. In the equipment 300, a control process is executed based on the control command stored in the transmission data. Subsequently, the processing request (2) is transmitted to the facility 300 via the relay device 200 in the same manner as the above processing. However, for example, when the control processing for the processing request (1) is not completed in the facility 300, the processing result for the processing request (2) cannot be obtained, and as a result, the computer 10
The processing result (not-yet-acquired notification) is returned to the 0 message conversion unit 102. When the processing result (not yet obtained notification) is returned, the retransmission request processing unit 1 of the message conversion unit 102
At 06, retransmission processing information is determined. The data transfer unit 105 retransmits the processing request (2) to the facility 300 based on the retransmission processing information.

As described above, according to the fourth embodiment,
By the retransmission processing in the message conversion unit, it can be expected that the response data is reliably obtained. Further, the processing load such as error handling at the application level can be reduced.

In the fourth embodiment, the computer is provided with a retransmission request processing unit for instructing the repeater to retransmit the communication control process or the data transmission / reception process.
An example of the data transmission system that automatically retransmits the response data from the equipment when the computer cannot obtain the response data from the relay device has been described.

Embodiment 5 A fifth embodiment of the present invention will be described with reference to FIG. 9 and FIGS. FIG. 9 shows the main configuration of the system of the present embodiment. Although the embodiment described here has the configuration of FIG. 1, elements that are not directly related to the description of the present embodiment are omitted in FIG. 9 in order to simplify the drawing and understand the features. did. In FIG. 9, 108, 2
A failure detection unit 08 receives a failure notification from the control communication connection 502 or the data transmission / reception communication connection 503 to notify that a failure has occurred.
Reference numerals 07a, 107b, 209a, and 209b denote a communication connection 503 for data transmission / reception and a communication connection 5 for control.
02 is a communication proxy processing unit that selects a communication connection in which no failure has occurred from 02 and instructs to substitute the communication connection. FIG. 10 is a flowchart illustrating a processing operation when a communication failure occurs in the data transmission / reception communication connection according to the present embodiment. FIG. 11 and FIG.
5 is a flowchart showing a processing operation when a communication failure occurs in a control communication connection in the present embodiment.

Next, the operation will be described. In the present embodiment, when a failure occurs in any one of the control communication connection 502 and the data transmission / reception communication connection 503 between the computer 100 and the relay device 200, the other failure is continued until recovery. By providing a method of substituting a communication connection that has not occurred, processing can be continued.

First, a processing procedure when a failure occurs in the data transmission / reception communication connection 503 will be described with reference to FIG.
Explanation will be made using 0. When a failure occurs in the data transmission / reception communication connection 503, the control communication connection 502 is used instead. In this case, all processing is realized by communication processing using a command ID. When a communication failure occurs in the data transmission / reception communication connection 503, the failure detection unit 108 receives a failure notification from the data transmission / reception communication connection 503 and notifies the data transfer unit 105 that the data transmission / reception communication connection 503 has failed. Notify. Then, the message conversion unit 10
The second data transfer unit 105 disconnects the data transmission / reception communication connection 503 (step S01). When a data transmission / reception request is issued from the facility control application 101, the communication proxy processing unit 107
b from the data transfer unit 105 to the command generation unit 104
Is requested to transfer the data to be transmitted to the equipment 300 on behalf of the data transfer unit 105 (step S0).
2). The command generation unit 104 stores a data transmission request in the command ID unit 3012, stores transmission data in the attached data unit 3013, generates request data 3010, and relays the request data 3010 via the control communication connection 502. To the device 200. Then, it waits for response data from the equipment 300 (step S03). The command analysis unit 205 of the relay device 200 transmits the
The request data 3010 is received from 0 (step S
04), a command ID is extracted from the request data 3010 (step S05). If the command ID is a data transmission request, the transmission data is extracted from the attached data section 3013 of the request data 3010, and the equipment cooperation processing section 2
02 (step S06). Equipment cooperation processing unit 202
Then, after transmitting the transmission data to the facility 300 through the facility communication interface unit 204, the transmission result is returned to the command analysis unit 205 and returned to the computer 100 as response data 3030 through the control communication connection 502 (step S07). The command generation unit 104 of the computer 100 receives the response data 3030 and extracts a processing result from the response data unit 3032 (Step S08). The processing result is stored in the command
4 is returned to the facility control application 101 through the data transfer unit 105 (step S09).

Next, a processing procedure when a failure occurs in the control communication connection 502 will be described with reference to FIGS. Control communication connection 502
If a failure has occurred, the failure detection unit 108 receives the failure notification and transmits the failure notification to the communication proxy processing unit 107a. The communication proxy processing unit 107a instructs to use the data transmission / reception communication connection 503 instead of the control communication connection 502. As in the case of the communication failure of the data transmission / reception communication connection 503, all data processing is performed by using the command ID. First, the processing procedure when a communication control processing request is made, and then the processing procedure when a data transmission / reception processing request is made, will be described.

The processing procedure at the time of requesting the communication control processing is as follows:
This will be described with reference to FIG. Control communication connection 50
2, when a communication failure occurs, the failure detection unit 108
Is the control communication connection 50 to the command generation unit 104.
2 is notified that a failure has occurred. The command generator 104 of the message converter 102 disconnects the control communication connection 502 (step S01). On the other hand, the command analyzer 205 of the repeater 200
Similarly, when the failure detection unit 208 detects a communication failure, the communication proxy processing unit 209a sends the data analysis unit 20
6, the command analysis unit 205 waits for reception of request data from the data analysis unit 206 (step S0).
2). When a processing request for communication control processing is issued from the equipment control application 101, the command generation unit 104 outputs a command ID corresponding to the communication control request.
Is generated, and a data transfer request is made to the data transfer unit 105 (step S03). The data transfer unit 105 transmits the request data 3010 to the relay device 200 via the socket interface unit 103, and waits for response data from the equipment 300 (Step S04). The data analysis unit 206 of the relay device 200 receives the request data 3010 from the computer 100 and transfers it to the command analysis unit 205 (Step S05). The command analysis unit 205 extracts a command ID from the request data (step S06). After executing the processing corresponding to the command ID through the facility cooperation processing unit 202, the processing result is received by the data analysis unit 206, and the data analysis unit 206 stores the processing result in the response data unit 3032 to generate the response data 3030. (Step S07), Data Analysis Unit 2
From 06, a reply is sent to the computer 100 via the data transmission / reception communication connection 503 (step S08). The data transfer unit 105 of the computer 100 receives the response data 3030 and transmits the response data 3030 to the command generation unit 104. Command generator 104
, The processing result is extracted from the response data unit 3032 (step S09), and the facility control application 101
(Step S10).

A processing procedure when a data transmission / reception processing request is made will be described with reference to FIG. When a communication failure occurs in the control communication connection 502, the failure detection unit 1
08 receives the failure notification and notifies the command generation unit 104 that a failure has occurred in the control communication connection 502. The command generation unit 104 disconnects the control communication connection based on the notified failure notification (step S01). Thereafter, when a processing request for data transmission / reception is issued from the facility control application 101, the data transfer unit 105 of the computer 100
Request data 3010 for command generation unit 104
Request for generation of The command generation unit 104 stores the data transmission request in the command ID unit 3012 and the transmission data in the attached data unit 3013, and stores the request data 3010
And the request data 3010 is transferred to the data transfer unit 1
05 (step S02). Data transfer unit 105
Transmits the request data 3010 to the relay device 200 through the socket interface unit 103, and
And waits for response data from (step S03). On the repeater side, the processes in step S2 and steps S05 to S08 in FIG. 11 are performed, and response data 3030 is returned to the computer 100 side. In the data transfer unit 105 of the computer 100, the response data 3030
And requests the command generation unit 104 to extract the processing result. The processing result is extracted from the response data unit 3032 by the command generation unit 104 and the data transfer unit 105
(Step S04), and the processing result is returned from the data transfer unit 105 to the facility control application 101 (Step S05).

As described above, according to the fifth embodiment,
Even when a failure occurs in one communication connection, the other communication connection can be used to continuously execute a processing request from the facility control application.

In this embodiment, a failure has occurred in a communication connection by providing means for detecting a failure in the communication connection between the computer and the relay device, and providing a communication proxy processing means using a normally operable communication connection. In this case, an example of the data transmission system that enables continuous processing without stopping the system has been described.

Embodiment 6 FIG. A sixth embodiment of the present invention will be described with reference to FIGS. FIG.
1 shows a main configuration of a system according to the present embodiment. Although the embodiment described here has the configuration of FIG. 1, elements that are not directly related to the description of the present embodiment are omitted in FIG. 13 in order to simplify the drawing and understand the features. did. FIG. 14 and FIG. 15 are flowcharts showing the processing operation of the communication failure recovery processing in the present embodiment. In FIG. 13, reference numeral 207 denotes a state management unit that manages communication failure information.

Next, the operation will be described. In this embodiment, when a failure occurs in one communication connection due to a problem on the repeater side, the cause of the failure is investigated by using the other communication connection in which no failure has occurred, thereby automatically re-establishing the failure. The connection processing is performed. The procedure of the failure search process differs for each communication connection. First, a failure search processing procedure in the data transmission / reception communication connection will be described, and then a failure search processing procedure in the control communication connection will be described.

First, the failure search procedure in the data transmission / reception communication connection 503 will be described with reference to FIGS.
This will be described with reference to FIG. Communication connection 5 for data transmission and reception
After the occurrence of the failure in S03, the data transfer unit 105 of the computer 100 executes a processing routine for recovering the failure in parallel with the operating environment in which the normal processing is operating. It starts up and generates an environment in which two processes of normal processing and failure recovery processing operate in parallel), and starts failure recovery processing (step S01).
In the thread, the command generation unit 104
It generates request data 3010 using the status (error information) acquisition request on the relay device 200 side as a command ID, and transmits the request data 3010 to the relay device 200 via the control communication connection 502 (step S02). On the other hand, in the relay device 200, after a communication failure has occurred, the failure detection unit 208 notifies the data analysis unit 206 of a failure notification. It is assumed that the failure notification includes a failure reason. The data analysis unit 206 stores the failure reason (error information) in the state management unit 2
07 (step S03). The request data 3010 transmitted in step S02 is received by the command analysis unit 205 (step S0
4). The command analysis unit 205 analyzes the request data 3010 received in step S04, acquires the failure reason registered in step S03 from the state management unit 207, and stores the failure reason in the response data unit 3032 of the response data. Communication connection 5 on the side
02 (step S05). Computer 10
The command generation unit 104 of 0 receives the response data 3030 transmitted in step S05, and detects a failure reason (error content) from the response data unit 3032 (step S06). If reconnection is possible after judging the content of the error, a request to reconnect the data transmission / reception communication connection 503 is made to the data transfer unit 105 and reconnection processing is performed (step S07). From the above,
When the data transmission / reception communication connection is reconnected,
The data analyzer 206 of the repeater 200 is a command analyzer 2
05, a communication failure recovery notification is sent. Thus, data transmitted to the control communication connection thereafter is not transferred to the data analysis unit 206.

Next, the procedure of a failure search process in the control communication connection 502 will be described with reference to FIGS. After a failure occurs in the control communication connection 502, the command generation unit 104 of the computer 100
Generates a thread corresponding to the failure recovery processing and starts the failure recovery processing (step S01). In the thread, the request to transmit the request data 3010 is sent to the data transfer unit 105 after generating the request data 3010 with the command to acquire the state (error information) from the relay device (step S02). . The request data 3010 is transmitted to the relay device 200 through the data transmission / reception communication connection 503, and the relay device 200 detects the communication
The command analysis unit 205 notified of the occurrence of the failure from 8 registers the reason for the failure (error information) in the state management unit 207 (step S03). The data transmitted in step S02 is received by data analysis section 206 (step S04). The data analysis unit 206 transmits the received data to the command analysis unit 205. When the transmission data is passed to the command analysis unit 205, the same processing as in step S05 of FIG.
0 is generated and passed to the data analysis unit 206. The data analysis unit 206 transmits the response data 3030 to the computer 100 through the data transmission / reception communication connection 503 (step S05). The data transfer unit 105 of the computer 100 receives the response data 3030 transmitted in step S05 and passes it to the command generation unit 104. In the command generation unit 104, the response data 3
The failure reason (error content) is detected from the response data section 3032 of step 030 (step S06). If reconnection is possible due to the content of the error, the command generation unit 104 performs reconnection processing for connecting the control communication connection 502 (step S07). As described above, when the control communication connection is reconnected, the command analysis unit 205 of the relay device 200 sends a communication failure recovery notification to the data analysis unit 206. As a result, the data transmitted to the data transmission / reception communication connection is not transferred to the command analysis unit 205 thereafter (step S08).

As described above, according to the sixth embodiment,
Even if a failure due to a problem on the repeater side occurs in the communication connection, the reason for the failure can be detected by using the other communication connection in which no failure has occurred for failure search, and reconnection can be performed. It becomes possible.

In the sixth embodiment, the computer is provided with a means for investigating the cause of a failure by using a normally operable communication connection and a means for performing reconnection processing. An example of a data transmission system has been described in which a state management unit that manages connection status is provided so that a connection state can be automatically restored even when a failure occurs.

Embodiment 7 FIG. The transmission path 500 described in the first to sixth embodiments is a transmission path using TCP / IP as a communication protocol, but may be a transmission path 500 for communicating information according to another communication protocol. The computer 100 includes a protocol information table for identifying the communication protocol of the transmission line 500, inputs line identification information for identifying the communication line of the transmission line 500, and outputs the protocol information table based on the input line identification information. To the line identification information input unit that indicates what the communication protocol of the transmission path 500 is. Accordingly, the computer 100 determines a communication protocol that can be used on the line from the type of the line of the transmission path 500, and transmits information of communication performed between the computer 100 and the relay device 200 so as to conform to the acquired communication protocol. A data transmission system that can be converted by the message conversion unit and make the transmission path 500 an arbitrary transmission path is realized.

[0053]

As described above, according to the example of the data transmission system of the present invention described in the above embodiment, the first
For example, when the intended uses of the information communicated by the computer and the second computer are a data transmission / reception process and a communication control process, the communication connection of the data transmission / reception process and the communication control process is separated. Thereby, the command analysis processing at the time of data transmission / reception processing can be omitted, and there is an effect that communication processing performance can be improved.

Further, the command generation unit processes the control command specialized for the communication protocol as a general-purpose command ID, so that the control command can be transmitted via the first communication line for communicating information according to the TCP / IP communication protocol. There is an effect that a communication control process can be realized from one computer to a facility device located at a remote place.

Also, the processing request information for making a processing request from the first computer to the equipment is converted into information that conforms to a communication protocol of a first communication line, for example, a TCP / IP communication protocol. The transmission to the device has the effect that the first computer can access the device without depending on the communication protocol of the device.

Further, a plurality of related processes that can be formed into a certain pattern are grouped, the grouped processes are transmitted from the first computer to the second computer, and the grouped processes received by the second computer are grouped. By collectively requesting the processing from the facility device, the amount of information to be communicated between the first computer and the second computer can be omitted, and the processing performance can be improved.

Further, even if there is no processing content corresponding to the grouped processing requested from the first computer to the second computer, the group processing function management device receives the request from the second computer. Access to
Acquire the corresponding processing content from the group processing function management device. Thus, the second computer has an effect that the processing can be continuously executed.

Further, by storing the grouped processing contents in the group processing function management device, it is not necessary to store all the grouped processing contents in the second computer. Therefore, there is an effect that the disk capacity and the memory capacity of the second computer can be saved.
Furthermore, by providing a group processing function management device,
For example, there is an effect that hardware such as an embedded device having a limited disk capacity or memory capacity can be applied as the second computer.

Further, since the first computer is provided with the retransmission request processing section, there is an effect that it is possible to expect to surely obtain response data from the second computer. Further, there is an effect that a processing load such as error handling at an application level can be reduced.

Further, by providing a plurality of communication connections in the first communication line, even if a failure occurs in a predetermined communication connection, a communication connection free from a failure other than the predetermined communication connection can be established. By using this, there is an effect that a processing request from the facility control application of the first computer can be continuously executed.

Further, since the first communication line is provided with a plurality of communication connections, even if a failure occurs in a predetermined communication connection, a communication connection free from failure and different from the predetermined communication connection can be established. By using the information, there is an effect that information can be continuously transmitted from the second computer to the first computer.

Even if a failure occurs in a predetermined communication connection among a plurality of communication connections due to a problem on the second computer side, another communication connection in which no failure has occurred is used for failure search. As a result, the first computer can access the state management unit of the second computer to detect the reason for the failure, recover the failure, and reconnect the failed communication connection. There is an effect that becomes possible.

The first communication line is identified, the first communication protocol is determined, and information communication is performed between the first computer and the second computer using the determined communication protocol. . Therefore, the user can arbitrarily select the first communication line and the first communication protocol, and there is an effect that options for utilizing the data transmission system of the present invention are widened.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main configuration of a data transmission system according to a first embodiment.

FIG. 2 is a diagram showing an internal structure of data transmitted and received between a computer 100 and a relay device 200.

FIG. 3 is a diagram showing an example of a communication control processing information table that stores processing request information requested from a facility control application, processing identification information corresponding to the processing request information, and the like.

FIG. 4 is a diagram showing a main configuration of a data transmission system according to a second embodiment.

FIG. 5 is a diagram showing an example of a group processing function information table indicating a group processing ID of a group processing requested from a facility control application according to the second embodiment and an arrangement place where the contents of the group processing are stored;

FIG. 6 is a flowchart of a processing operation according to the second embodiment.

FIG. 7 is a diagram showing a main configuration of a data transmission system according to a third embodiment.

FIG. 8 is a diagram showing a main configuration of a data transmission system according to a fourth embodiment.

FIG. 9 is a diagram showing a main configuration of a data transmission system according to a fifth embodiment.

FIG. 10 is a flowchart showing a processing operation when a communication failure occurs in a data transmission / reception communication connection according to the fifth embodiment.

FIG. 11 is a flowchart showing a processing operation when a communication failure occurs in a control communication connection according to the fifth embodiment.

FIG. 12 is a flowchart illustrating a processing operation when a communication failure occurs in a control communication connection according to the fifth embodiment.

FIG. 13 is a diagram showing a main configuration of a data transmission system according to a sixth embodiment.

FIG. 14 is a flowchart showing a processing operation of a communication failure recovery process according to the sixth embodiment.

FIG. 15 is a flowchart showing a processing operation of a communication failure recovery process according to the sixth embodiment.

FIG. 16 shows a LAN via a conventional protocol converter.
FIG. 2 is a diagram illustrating a configuration of a data transmission method for controlling communication between a system and a serial terminal.

[Explanation of symbols]

100 computer, 101 equipment control application,
102 message conversion unit, 103 socket interface unit, 104 command generation unit, 105 data transfer unit, 106 retransmission request processing unit, 107a, b communication proxy processing unit, 108 failure detection unit, 200 repeater, 201
Message analysis unit, 202 Equipment cooperation processing unit, 203
Socket interface unit, 204 Communication interface unit for equipment, 207 Status management unit, 208 Failure detection unit, 209a, 209b Communication agent processing unit, 300
Equipment, 400 group processing function management device, 401 group processing function management unit, 402 group processing function management warehouse, 403 socket interface unit, 500, 5
01 transmission line, 502 communication connection for communication control,
503 communication connection for data transmission / reception, 3010
Request data, 3011 TCP / IP header part,
3012 command ID part, 3013 attached data part,
3020 request data, 3021 TCP / IP
Section, 3022 request data section, 3030 response data, 3031 TCP / IP section, 3032 response data section, 4000 communication control processing information table, 4001
Communication control command, 4002 command ID, 5000
Group processing function information table, 5001 Group I
D, 5002 placement location.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04L 29/14 F term (Reference) 5K030 GA12 HA08 JA11 KA13 MB20 5K033 AA06 BA04 CB14 CC01 DB18 EA04 5K034 AA16 DD01 EE11 HH01 HH02 HH06 HH61 5K035 AA07 BB01 CC09 JJ01 LL17 9A001 BB04 BB04 BB06 CC02 CC06

Claims (9)

[Claims] A first computer and a second computer connected by a first communication line, wherein the first computer and the second computer are connected to each other via the first communication line. In the data transmission system for performing information communication by communication, the information communicated between the first computer and the second computer has a plurality of intended uses, and the first communication line The first computer has a communication connection for each purpose and uses the communication connection of the first communication line corresponding to a plurality of purposes and uses the information to address the information to the second computer. A data transmission system comprising a message conversion unit for transmitting a message. 2. The first communication line communicates information according to a first communication protocol, and the data transmission system further includes a second communication line different from the first communication line. The second computer and the equipment device communicate information via the second communication line with a second communication protocol different from the first communication protocol. The information to be communicated between the first computer and the second computer is a process for the first computer to request the facility device to perform a process using the second computer as a relay. Request information, the first computer includes a facility control application that generates the processing request information, and the message conversion unit generates the processing request information. A command generation unit that inputs processing request information, converts the processing request information into processing identification information that identifies the processing requested by the processing request information, and transmits the processing identification information to the second computer. A facility cooperation processing unit that analyzes the process identification information transmitted from the command generation unit, converts the process identification information into information that requests the facility device to perform processing, and transmits the information to the facility device using the second communication protocol. The data transmission system according to claim 1, further comprising: 3. The processing request information includes group processing request information for grouping a plurality of processings related to the equipment from the first computer and requesting the processing as one processing. Analyzing the group processing request information of the processing request information to obtain a plurality of related processes indicated by the group processing request information, and performing a process on the plurality of facility devices from the obtained plurality of processes. 3. The data transmission system according to claim 2, wherein the information for requesting is generated and transmitted to the equipment device in a lump. 4. The data transmission system further includes a group processing function management warehouse that stores in advance the group processing request information and a plurality of related processes indicated by the group processing request information in association with each other. Second
And a group processing function management device connected to the second computer to access the group processing function management warehouse from the second computer. The equipment cooperation processing unit is configured to execute the processing based on the group processing request information of the equipment information. 4. The data transmission system according to claim 3, wherein the group processing function management warehouse of the group processing function management device is accessed to acquire a plurality of related processes indicated by the group processing request information. 5. The retransmission request processing unit for requesting the second computer to re-execute information communication between the first computer and the facility device which has already been executed. The data transmission system according to claim 1, further comprising: 6. A first failure detection unit that receives a failure notification of a failure that has occurred in a communication connection from each of a plurality of purpose-specific communication connections of the first communication line. Based on the failure notification received by the first failure detection unit, a normally operable communication connection is acquired from the plurality of communication connections, and the normally operable communication connection has the failure. 2. The data transmission system according to claim 1, further comprising a first communication proxy processing unit for proxying a communication connection. 7. A second fault detecting unit for receiving a fault notification of a fault occurring in a communication connection from each of a plurality of purpose-specific communication connections of the first communication line. Based on the failure notification received by the second failure detection unit, a normally operable communication connection is obtained from the plurality of communication connections, and the normally operable communication connection has the failure. 7. The data transmission system according to claim 1, further comprising a second communication proxy processing unit for proxying a communication connection. 8. The second computer according to claim 1, further comprising: a state management unit that manages communication states of the plurality of communication connections for each purpose of the first communication line and holds state information indicating the communication state. The message conversion unit, when receiving a notification of a failure occurring in a communication connection from the first failure detection unit, acquires status information of the failed communication connection to the state management unit. Based on the status information obtained from the fault cause investigating unit requesting the second computer to
7. The data transmission system according to claim 6, further comprising: a reconnection processing unit that requests a connection of the failed communication connection again. 9. A data transmission system comprising a first computer and a second computer connected by a first communication line, and performing information communication between the first computer and the second computer. In the above, the first computer may further include: a protocol information table for storing line information indicating the type of the first communication line and communication protocol information indicating a communication protocol usable in the communication line in association with each other; A line identification information input unit for inputting line identification information for identifying one communication line and obtaining communication protocol information from the protocol information table based on the input line identification information; A message for converting information to be communicated between the first computer and the second computer so as to conform to the communication protocol indicated by the communication protocol information. Data transmission system is characterized in that a chromatography di conversion unit.