JPH11177587A - Data transmission method and data transmission system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To automatically determine the order of transmission data among devices such as a control device, a monitoring device, a maintenance device, and a data analysis device which constitute a plant control and monitoring system, and to check for an inconsistency in the data sequence. Not required. SOLUTION: Arrangement information (arrangement of transmission data, arrangement of reception data) of transmission data of respective devices 12 to 16
Is received by the integrated D / B server 11, and the transmission-side devices 13, 15, 16 are determined based on the arrangement information of the transmission data of all the devices 12 to 16.
Sequence information 33, 35, 36 and the receiving-side devices 12, 13,
The address conversion maps 17, 18, and 19 of the reception data of the reception-side devices 12, 13, and 14 are generated by associating the 14 pieces of array information 31, 32, and 34 with each other. To receive the data to be received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission method and a data transmission system. For example, in a plant control / monitoring system, a control device, a monitoring device, a maintenance device, a data analysis device, etc., constituting the system are connected. Is automatically determined.

[0002]

2. Description of the Related Art In this type of conventional system, in order to determine the arrangement of transmission data between devices, the arrangement of transmission data is determined in consideration of the entire system, separately from the design of each device. According to the order, each device was transmitting data. As another determining means, one of the transmitting device and the receiving device determines the arrangement of transmission data, and the other transmits or receives data according to the arrangement.

FIG. 6 shows a configuration and a data flow of a conventional data transmission system. In FIG. 6, reference numeral 12 denotes a monitoring device (station No. 1) for monitoring a plant, 13 denotes a data analyzer (station No. 10) for analyzing plant data, and 14 denotes a maintenance device (station No. 1). 20 and 15 and 16 are control devices (station No. 11) for performing plant control.
And No. It is assumed to be 12. ).

[0004] Each of these devices 12-16 is connected online on a network. Also, the monitoring device 1
2. A plurality of control devices 15 and 16 usually exist.
Signals exchanged between these devices are transmitted over a network.

In a plant monitoring / control network,
A communication system generally called a cyclic transmission or a broadcast message communication system is adopted, and a specific amount (a process value of a plant or the like) of data is transmitted periodically (usually 300 msec to 1 second). The arrangement of data in the cyclic transmission or broadcast message communication system is determined as common information, and transmission / reception programs or databases of the respective devices are designed and manufactured based on the determined common information.

[0006]

In the conventional transmission data system, since each device designs and manufactures a program or a database together with the transmission data, the arrangement of the transmission data is first determined in the system design. Must be performed, which is a constraint on the design and manufacturing process of each device.

Further, when the transmission data is changed, the program or database of the transmission device and the reception device must be changed, and inconsistency between the transmission side and the transmission side of the transmission data is prevented. Therefore, all the changes had to be implemented at the same time. The inconsistency between the transmission side of the transmission data and the reception side refers to, for example, a case where the arrangement of the alarm signals of the transmission side control device does not match the arrangement of the alarm signals of the reception side monitoring device. May occur.

Further, in the conventional method, the transmission side and the reception side check whether there is any inconsistency in the transmission data. The transmission side sets simulated data and the reception side confirms the data. It took a lot of time to check for inconsistencies.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a transmitting side and a receiving side can arrange a transmission data (output data) and a reception data without paying attention to the arrangement of transmission data. It is another object of the present invention to automatically determine the arrangement of (input data) and to eliminate the need for checking for inconsistency in transmission data between a transmission side and a reception side.

[0010]

(1) A data transmission method according to the present invention provides a data transmission system comprising: a plurality of stations for exchanging data with each other; The transmitting side data name and the receiving side data name are referred to by referring to the transmitting side array information in which the names are arranged in the data transmission order and the receiving side array information in which the data names of the data received by the receiving station are arranged. An associated address translation map is generated, and the receiving station receives data to be received with reference to the address translation map when transmission data from the transmitting station is transmitted.

(2) A data transmission system according to the present invention is constituted by connecting a plurality of stations for exchanging data with each other and a server for managing these stations via a communication line, and the transmitting station includes: And transmitting, to the server, transmission-side arrangement information in which data names of data to be transmitted are arranged in the data transmission order, and the reception-side station transmits, to the server, reception-side arrangement information in which data names of data to be received are arranged. The server generates and stores an address conversion map in which the data name of the transmission side is associated with the data name of the reception side with reference to the transmitted sequence information of the transmission side and the reception side, and Transmit to the side station and save,
When the transmission data from the transmission station is transmitted, the reception station refers to the address conversion map and receives the data to be received.

(3) In the data transmission system of the above (2), the receiving station is provided with a check function. When the transmitting station changes the sequence information, the changed sequence information and the version of the sequence information are changed. The server transmits the information to the server, and the server updates the address conversion map from the changed sequence information, and transmits the updated address conversion map and the version information of the changed sequence information to the receiving side of the address conversion map update target. The received version information is compared with the version information received thereafter or the version information stored by the server, and the version match is checked by the check function of the receiving station. This is a check to confirm.

(4) In the data transmission system of the above (2), the receiving station is provided with a check function, and when there is a change in the sequence information, each station transmits the changed sequence information to the server. Compares the currently stored sequence information with the changed sequence information, and if the contents do not match, updates the address conversion map based on the changed sequence information. The version information of the changed sequence information and the version information of the changed sequence information are transmitted to and stored in the receiving station to be updated with the address translation map, and the stored version information and the subsequently received version information are checked by the checking function of the receiving station. Version information or the version information stored by the server above to check for a version match. And performs a click.

(5) In the data transmission system of (3) or (4) above, if the version information is not matched as a result of checking the version information, the server translates the address conversion map and the version information from the server to the receiving station. Is transmitted and updated.

(6) In the data transmission system according to any one of (2) to (5), test data is transmitted from a transmitting station, received by a receiving station, and the transmitted test data is transmitted. Is compared with the received test data, and whether or not the transmission is normal is determined according to the comparison result.

(7) In the data transmission system according to any one of the above (2) to (6), when the data transmission system is activated, when a receiving station is activated, or when data transmission is online, The address translation map stored by the server or the address translation map and its version information are transmitted to the receiving station and stored.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the data transmission system according to the first embodiment. FIG. 2 shows the data configuration of the transmission data database (D / B).

In FIG. 1, reference numeral 11 denotes a database server (integrated D / B server) for managing transmission data addresses,
12 is a monitoring device (station N) for monitoring the plant.
o. Let it be 1. ), 13 are data analyzers for analyzing plant data (station No. 10), 1
4 is a maintenance device (station No. 20), 1
Reference numerals 5 and 16 denote control devices (station Nos. 11 and 12) for performing plant control.

These 12 to 16 are integrated online on a network. In general, a plurality of monitoring devices 12 and control devices 15 and 16 exist. Signals exchanged between the devices are transmitted over a network. In the plant monitoring and control network,
A communication method generally called a cyclic transmission or a broadcast message communication method is adopted, and a specific amount of data is transmitted periodically (usually 300 msec to 1 second).

This embodiment makes it possible to arbitrarily determine the arrangement of the cyclic transmission data described above independently of each device, and even if it is determined arbitrarily, the arrangement is changed according to the design of another device (for example, (The change of the transmission / reception program or database of each device due to the change of the sequence of the transmission data of the cyclic transmission as described above) is not required.

The arrangement of the data of the cyclic transmission will be described. In the control devices 15 and 16, output tag numbers (output tag names) for distinguishing transmission data to be transmitted are created as array information 35 and 36 arranged in the order of transmission. This array information is stored in the address (1, 2, 3,.
・) Stored in memory / hard disk etc. in order. In the monitoring device 12, an input tag No (input tag name) for distinguishing the received transmission data is created as the sequence information 31. This array information 31 has addresses (1, 2, 3,...)
・) Stored in memory / hard disk etc. in order.

In the data analysis device 13, since there are transmission and reception data, the sequence information 3 indicating the sequence of the input tag No.
2 and array information 33 indicating an array of output tag numbers. In the maintenance device 14, array information 34 indicating the array of the input tag numbers is created.

The above sequence information is created individually in each device (station). This creation can be performed manually or automatically (in ascending or descending alphabetical order or in the setting destination). Etc.).

FIG. 2 shows an example of the data structure of the transmission data D / B in the integrated D / B server 11, wherein "STN" is used.
.., 1, STN2,... Indicate station numbers, and for each station, “input tag array information”, “address conversion map” corresponding to the input tag, and “output tag array information” are stored. Have been.

The devices on the receiving side (input side) such as the monitoring device 12, the data analyzing device 13, and the maintenance device 14 for receiving data are automatically created with address conversion maps 17, 18, and 19, respectively, as described below. Is done.

(1) Each of the devices (stations) 12 to 16 for transmitting and receiving transmission data integrates an input data name (input tag No.) and an output data name (output tag No.) created as array information on an address. / B server 11
Send to That is, the sequence information 31, 32, 33, 34,
35 and 36 are transmitted to the integrated D / B server 11.

(2) The integrated database (D / B) server 11 arranges input data names (input tag numbers) and output data names (output tag numbers) of the devices (stations) (which data names are arranged in what order). To output or input).

(3) The integrated D / B server 11 generates address conversion maps 17 to 19 corresponding to the input tag No array for each device from the array information. For example, the address translation map 17 indicates that the data name input from the network by the monitoring device 12 is “TAG-1B, TAG-2”.
C, TAG-2D,..., "11-2, 1" using the index of the array of the station No. and output tag No. of the device outputting these data names.
2-3, 12-4, ... ".

More specifically, for the first address "TAG-1B" in the array information 31 of the monitoring device 12, the second address of the array information 35 of the control device 15 (station No. 11) is used. Is the signal from “TAG-1B”, “11-2” is the first conversion data in the address conversion map 17.

(4) Next, the integrated D / B server 11 delivers the address conversion maps 17, 18, and 19 to the corresponding devices (stations). (5) The corresponding device (station) receives the address translation map of its own station and stores it as shown in FIG.

In this way, an address translation map can be automatically generated. The control device 15, which is the transmitting side,
16. Address map 35, 3 of data analyzer 13
When the arrangement information of the output tag No. such as 6, 33 is changed, each time the change is transmitted, the change is transmitted to the integrated D / B server 11, and the integrated D / B server 11 updates the address conversion map related to the change. To the relevant station.

Next, when normal data transmission is performed, (1) TAG-1A (address 11-1) TAG-1B (address 11-2) TAG-1C ( The data of the tag name is transmitted to the network in the order of the address 11-3).

(2) Since the address 1 of the address conversion map 18 is "11-1", the data analyzer 13 outputs the signal 1 from the controller 15 (station No. 11).
-Th data (data of data name TAG-1A) is received.

(3) The data (TA) of address 2 transmitted from the control device 15 (station No. 11)
G-1B) shows the address conversion map 17 of the monitoring device 17.
Since the first address is “11-2”, it is received by the monitoring device 17. (4) At the same time, the address conversion map 19 of the maintenance device 14 is used.
Is also "11-1", the maintenance device 14
Is received.

(5) When the transmission data of the control device 15 is transmitted as described above, the transmission data of the control device 16 is transmitted in the same manner as the data transmission of the monitoring device 15, and then the data analysis is performed. The transmission data of the device 13 is transmitted. Thus, transmission / reception of transmission data during normal monitoring control is performed.

As described above, in this embodiment, by using the integrated D / B server 11 for generating the address conversion map, the control devices 15 and 16, the monitoring device 12, the data analysis device 13, and the maintenance device 14 are used. Each device can determine the names and arrangements of data to be input and output separately from the other devices.

The arrangement of the transmission data of the control devices 15 and 16 and the data analysis device 13 (array of output tag numbers)
Even if there is a change in the address, the address conversion map is automatically changed, so that the arrangement of the received data of the monitoring device (array of input tag numbers) is not changed, so that the receiving program or database of the monitoring device is No change occurs.

Further, since the integrated D / B server automatically generates the address conversion map, inconsistency between the transmission data transmission side and the transmission data reception side does not occur, and the work of checking for inconsistency is not required.

When a plurality of transmitting devices transmit the array information to the comprehensive data D / B server 11, each transmitting device does not transmit its own station number. The station number is usually uniquely determined in the system network, and is managed and stored as one table in the comprehensive database.
The server 11 automatically recognizes from which apparatus (station No.) the sequence information is transmitted from the apparatus name (station name). If it is not automatically recognized, the transmitting device transmits its own station No. and sequence information to the integrated data D / B server 11.

Further, when transmitting data, the transmitting side apparatus performs:
The data is transmitted in the arrangement of the arrangement information, but the own station No is not transmitted. Regarding the identification of the station No., when transmitting and receiving cyclically, each transmitting / receiving apparatus sets a cyclic area of a predetermined size and periodically (30).
The data is updated (0 msec to 1 second) (the cyclic area always has the same data value). However, since the cyclic area is divided and assigned to each station, station identification is automatically performed. Done in

This cyclic area determines which area is set as a transmission area by each device in designing a network. Since the receiving side receives the same area as the transmission area as the reception area, it is not necessary to define the reception area, and the entire reception area is used as the reception area. For example, a cyclic area of 64 kByte is allocated, of which 0 to 2 kB is allocated as a transmission area for STN1, 2 to 4 kB is allocated as a transmission area for STN2, ..., and data is transmitted from the allocated transmission area. The receiving side device is S from the 0-2 kB area.
Recognize the transmission data for TN1 and receive the data, 2-4
From the kB area, it recognizes transmission data for STN2 and receives data.

Embodiment 2 In the first embodiment, the case where the arrangement of the transmission data (the arrangement of the output tag numbers) of the control devices 15 and 16 and the data analysis device 13 is changed, but the arrangement of the reception data (the input tag If there is a change in the arrangement of No., the change of the address translation map of the changed monitoring device (receiving station) does not affect other devices even if the change is made in the monitoring device.

However, since the address conversion map of the changed monitoring device stored in the integrated D / B server is not revised, the two address conversion maps do not match.
Therefore, it is preferable to make the address conversion maps of the two coincide with each other in terms of management by the integrated D / B server. (If they do not match, the integrated D / B server cannot check the address conversion map of the receiving device.)

Therefore, the receiving device such as the changed monitoring device integrates the changed input tag No. array information into the integrated D / B.
The data is transmitted to the server, and the integrated D / B server revises the address translation map from the sequence information, transmits the revised address translation map to the receiving apparatus to be changed, and revises the address translation map of the apparatus.

As described above, the second embodiment can cope with a change in the arrangement information in the receiving apparatus.

Embodiment 3 In the first and second embodiments, the integrated D / B server 11 generates an address conversion map from the input / output tag No array of each device, and thereby transfers the arrangement of transmission data of each device to another device. Although the case where the determination is made without dependence has been described, this embodiment provides the following two as shown in FIG.

(1) The device (receiving station) input from the network has a map version table 2
1 to 23 are provided. This map version table 21
23 is a table in which the version of the array information for each transmitting apparatus is represented by a version number (version information).

(2) An arrangement of transmission data (output tag N
o sequence information) is provided with a version number (41, 42, 43 in FIG. 5) of the sequence information. This version No
Is changed (upgraded) when the array information of the output tag No is changed and updated.

The generation of the map version table is performed as follows. The integrated D / B server 11 generates the map version tables 21, 22, and 23 using the version number of the array information when generating the address conversion map from the array information transmitted from the transmitting device. The map version table is STN (station N
o) and Ver. (Version information version number).

For example, it is assumed that when the output tag No. array of the control device 15 is changed, the version of the array information becomes “3”. In the map version table 21 of the monitoring device 12, the STN (station No.) of the control device 15
Since the version number corresponding to 11 is “3”, the version numbers match. In this case, since the current address conversion map is correct, data input from a normal network is performed. If the version N of the station No. 11 in the map version table 21 of the monitoring device 12
If o remains "2", data input is interrupted.

The inconsistency of the versions occurs, for example, when the control device is stopped and modified during the periodic inspection of the plant. (1) When this modification is performed, if the arrangement of signals to be output (transmitted) to the network is added or changed, the version number of the sequence information is also updated. (2) The control device is started after the modification, and the version number is transmitted to the comprehensive data D / B server 11 together with the sequence information.

(3) The receiving apparatus compares the map version table stored therein with the map version table generated by the integrated data D / B server 11 so that the contents of both tables do not match. Become. (4) If the data does not match, the receiving device sets the total data D / B
An address conversion map and a map version table are obtained from the server 11 and stored.

Thus, transmission and reception of matched data between the transmitting device and the receiving device can be performed. Further, upon detecting the version mismatch, the receiving device suspends only data reception from the mismatched transmitting device. Therefore, even if the data is received before the receiving device obtains the latest address translation map, the modified inconsistent data of the transmitting device is not input.

Also, when the monitoring device on the data receiving side is stopped for remodeling, if the arrangement information of the control device on the transmitting side is changed during the halt, the monitoring device is started when
The version numbers of the map version table stored in the monitoring device and the map version table stored in the integrated data D / B server 11 do not match. By obtaining the map version table stored in the integrated data D / B server 11 and comparing and checking the two tables, it can be determined whether or not the address translation map of the monitoring device needs to be updated.

As described above, even when the transmission data is mismatched during the remodeling of the device, it is possible to avoid inputting the signal data with the mismatch. Therefore, the use of this map version table makes it possible to remodel a device during operation of the system without being aware of the status of other devices.

Embodiment 4 In the third embodiment, when the array information of the output tag of the transmitting apparatus is changed, the version information (version No.) is added to the array information,
Although the integrated D / B server creates the map version table, the third embodiment shows a mode in which version information is not added by the transmitting device.

When the transmitting apparatus changes the arrangement information of the output tag, it transmits only the arrangement information to the integrated D / B server 11, and the integrated D / B server 11 transmits the transmitted arrangement information and the transmission data D / B in the server. B, and compares it with the sequence information stored in B. If there is a match, the version number of the map version table is not changed. Send to device with revised address translation map.

In this way, the number of management tasks in the integrated D / B server increases, but the means for adding the version information in the transmitting device to the array information can be omitted.

Embodiment 5 FIG. In the first embodiment, the integrated D / B server 11 generates an address conversion map from the data names of the input and output tag numbers of each device, and each device independently determines an input tag No. array and an output tag No. array Although it is possible, in order to actually apply the present invention to a plant system, it is necessary to input simulated data from the control devices 15 and 16 and confirm the data value of the simulated data with the monitoring device 12 or the like. FIG. 4 shows a state when a test is performed in the fifth embodiment.

Next, the operation will be described. (1) The integrated D / B server 11 generates test data and transmits the generated test data to the control devices 15 and 16 and the data analysis device 13 which are transmission-side devices. (2) The transmitting device outputs the test data to the network.

(3) The receiving device such as the monitoring device 12 reads the input data and transmits it to the integrated D / B server 11. (4) The integrated D / B server 11 uses the data sent from the monitoring device 12 or the like and the address conversion map 17 of the monitoring device 12 to check whether the data matches the test data.

For example, the head of the input data of the monitoring device 12 has a data value of “1100002”, but from the address conversion map 17, it is found that this is the second data from the head of the output data of the station No. 11. I do. The second from the top of the test data of the station 11 is the data of “1100002”, which is identical.

The head of the input data of the data analyzer 13 is a data value of “1100002”.
It is determined that the output data is the first data from the head of the output data. The first of the test data of the station 11 is the data of “1100001”, which is inconsistent.

As described above, the integrated D / B server 11
By performing test data generation and test data collation,
It is possible to automatically check the arrangement of the transmission data. That is, according to the method of the first embodiment, it can be proved by an algorithm that no inconsistency of transmission data occurs, but in the present embodiment, this is transmitted by transmitting specific data between the devices. Automated data testing,
This is to shorten the transmission data test time.

If the collation result of the test data does not match, the address translation map of the receiving station at the mismatched location is generated again, redistributed to the station, and re-simulated.

Embodiment 6 FIG. In the first and second embodiments, it has been described that the address conversion map and the map version table are generated by the integrated D / B server 11, and when these maps and tables are updated, they are delivered to each device each time. However, this embodiment has the following two functions.

(1) As shown in FIG. 5, when the device having the input tag number (receiving station) or the entire data transmission system is started, the address conversion map and the map version table are integrated into the D / B server. The contents of the address translation map and the map version table of the receiving station are the same as those of the server, so that no mismatch occurs.

(2) Even during normal transmission, that is, in the on-line state, the receiving-side apparatus determines that the address conversion map is
If delivered from the / B server 11, the function of updating the contents of the memory and the hard disk (HD) in the device online, and this function allows the address translation map to be updated online without interrupting data transmission.

As described above, since the correspondence is made between the start-up and the online state, when the transmission data of the network is changed, the address translation map is automatically updated. It is not necessary to change the program or the sequence information database, and it is not necessary to restart the device. Therefore, the system can be easily remodeled, and the change can be made without interrupting the apparatus (stopping data transmission, resetting the power supply, etc.).

Embodiment 7 FIG. In the above embodiment, signals are exchanged via a network, but an optical communication line or a wireless communication line may be used.

[0071]

As described above, according to the present invention, the address translation map is automatically generated, so that the transmitting side and the receiving side stations can independently create the arrangement of the transmission data. Also, changes can be made easily. Further, it is not necessary to check for mismatching of transmission data between the transmission side and the reception side.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a data transmission system according to a first embodiment of the present invention.

FIG. 2 shows transmission data D according to the first embodiment of the present invention.
FIG. 6 is a diagram showing a data configuration of / B.

FIG. 3 is a configuration diagram of a data transmission system according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a data transmission system according to a fifth embodiment of the present invention.

FIG. 5 is a configuration diagram of a data transmission system according to a sixth embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional data transmission system.

[Explanation of symbols]

11 Integrated Data Database Server (Comprehensive Data D /
B server) 12 monitoring device 13 data analysis device 14 maintenance device 15, 16 control device 17, 18, 19 address conversion map 21, 22, 23 map version table 31, 32, 33, 34, 35, 36 sequence information

Claims (7)

[Claims] 1. A data transmission system comprising a plurality of stations for exchanging data with each other, transmitting side array information in which data names of data transmitted by the transmitting side station are arranged in data transmission order, and Referring to the receiving side array information in which the data names of the data received by the station are arranged, an address conversion map in which the transmitting side data name and the receiving side data name are associated with each other is generated, and the receiving side station The present invention relates to a data transmission method, wherein when transmission data from a transmitting station is transmitted, data to be received is received by referring to the address conversion map. 2. A plurality of stations for exchanging data with each other and a server for managing these stations are connected to each other via a communication line, and the transmitting station transmits a data name of data to be transmitted. While transmitting the transmitting side array information arranged in order to the server,
The receiving station transmits, to the server, receiving-side arrangement information in which data names of data to be received are arranged, and the server refers to the transmitted arrangement information of the transmitting side and the receiving side to transmit data of the transmitting side. An address translation map that associates the name with the data name of the receiving side is generated and stored, and transmitted and stored to the receiving station. The receiving station transmits the transmission data from the transmitting station. The data transmission system receives the data to be received by referring to the address conversion map. 3. The data transmission system according to claim 2, wherein a check function is provided in the receiving station, and when the sequence information is changed, the transmitting station transmits the changed sequence information and the version information of the sequence information to the server. And the server updates the address translation map from the changed sequence information, and transmits the updated address translation map and the version information of the changed sequence information to the receiving station for updating the address translation map. The check function of the receiving station compares the stored version information with the version information received thereafter or the version information stored by the server to check whether the versions match. A data transmission system characterized by performing. 4. The data transmission system according to claim 2, wherein a check function is provided in the receiving station, and when each station changes the sequence information, the changed sequence information is transmitted to the server, and the server stores the changed sequence information. The updated sequence information is compared with the changed sequence information, and if the contents do not match, the address conversion map is updated based on the changed sequence information. The transmitted version information of the sequence information is transmitted to the receiving station to be updated with the address translation map and stored, and the stored version information and the version information or Perform a check to compare the version information stored by the above server and confirm that the versions match A data transmission system characterized by the following. 5. The data transmission system according to claim 3, wherein as a result of checking the version information, if the version information does not match, the address translation map and the version information are transmitted from the server to the receiving station. A data transmission system characterized by updating. 6. The data transmission system according to claim 2, wherein test data is transmitted from a transmitting station, received by a receiving station, and the transmitted test data and the received test data are transmitted. And compare
A data transmission system which determines whether or not transmission is normal according to a result of the comparison. 7. The data transmission system according to claim 2, wherein the server stores the address translation when the data transmission system is activated, the receiving station is activated, or the data transmission is online. A data transmission system wherein a map or an address translation map and its version information are transmitted to a receiving station and stored.