JPH09305563A - Data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the processing burden in the manner of software for writing data into a queue table by writing the transmission data into any correspondent area inside the queue table after the confirmation of presence/absence flag when a write request is generated. SOLUTION: When the write request is inputted from a host computer 11 and the presence/absence flag of a management storage part corresponding to the identification number of inputted transmission data shows presence, the transmission data are written in the area designated by a storage destination index number stored in the management storage part. When the presence/ absence flag shows absence, the transmission data are written in the area designated by a write index number, and the presence of the presence/absence flag and the storage destination index number are registered in the management storage part. Besides, when a read request is inputted from a slave station 17 and a read index number is different from the write index number, the transmission data in the area designated by the read index number are read out and the presence/absence flag corresponding to the identification number of these transmission data is registered to absence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for performing data transmission between a plurality of information processing units that perform data processing asynchronously with each other.

[0002]

2. Description of the Related Art When data is transmitted between a plurality of information processing apparatuses that perform data processing asynchronously with each other, data is not directly transmitted and received between the information processing apparatuses, but data is temporarily stored in the middle. A buffer or queue table is provided, and the information processing apparatus on the transmission side writes data in the buffer or queue table at its own data processing timing or data processing cycle. On the other hand, the information processing device on the receiving side reads out the data written in the buffer or the queue table at its own data processing timing or data processing cycle and takes it into its own device.

FIG. 28 is a block diagram showing a schematic structure of a data transmission device having the above-mentioned data transmission function.
Transmission data composed of data input from the host computer 1 as the information processing device on the transmission side, an identification number for identifying the attribute of the corresponding data, and a mask pattern for specifying the effective bit position of the corresponding data, and for writing this transmission data A timing signal (write request) is received by the input data writing unit 2 and written to the queue table 3 in synchronization with the timing signal.

The transmission data editing unit 4 reads the transmission data written in the queue table 3 in response to a read request from the slave station 7 as the information processing device on the receiving side, edits it into a transmission text, and transmits it. It transmits to the slave station 7 of the read request source via the unit 6. The transmission data is stored in the transmission data storage unit 5 as needed.

Here, it is assumed that transmission data composed of an identification number, data and a mask pattern is input from the host computer 1 in the order shown in FIG. When the data of the same identification number is continuously input from the host computer 1, the data is written and stored in the queue table 3 in the input order.

When a read request is input from the slave station 7, the transmission data editing unit 4 reads each transmission data stored in the queue table 3 in the order of input and edits the transmission text 8 shown in FIG. , The slave station 7 via the transmitter 6.
Send to

However, the queue table 3 of the host computer 1
On the other hand, when the write request time interval is longer than the read request time interval of the slave station 7, the queue table 3 is stored in the FIFO memory (first-in first-out or first-out).
When configured as st-in fast-out), the data processing in the transmission data editing unit 4 in the data transmission device is performed in the writing order in the FIFO memory.

When a plurality of requests for certain specific information are continuously made in a short time, data processing is performed in the order of request. However, if the data processing speed on the slave station 7 side is low, the time spent until the data processing is completed may not be negligible.

However, when the transmission data transmitted from the host computer 1 is data obtained by sampling continuous data such as plant process data, the slave station 7 only has the latest data at the time of the read request. Of course, data older than this latest data is often not needed. In such a case, it is useless to edit all the transmission data stored in the queue table 3 into the transmission text 8 and transmit it.

In order to eliminate such inconvenience, FIG.
As shown in FIG. 1, a plurality of storage areas 9 and one management area 10 are provided in the queue table 3, and the storage area 9 for reading is designated when the management area 10 receives a read request from a slave station. The read index number i to be written and the write index number j for designating the storage area 9 for writing when there is a write request from the host computer 1 are set.

Then, as shown in the flow chart of FIG. 32, when a write request is issued from the host computer 1, the read index number i and the write index number j are compared (P
2) If they match, the identification number, data, and mask pattern of the write request are written in the storage area 9 indicated by the write index number j (P8). Then, the write index number j is updated (P9), and the updated write index number j
Has reached the final storage area 9 (P10), the write index number j is returned to the initial value (P11).

If they do not match in P2, it is checked whether or not the identification number of the write area indicated by the read index number i and the identification number of the transmission data of the current write request match (P3). If they do not match, the read index number i
Is updated by 1 and the process returns to P2. When the updated read index number i reaches the final storage area 9 (P6), the read index number i is returned to the initial value and then the process returns to P2.

Then, at P3, the read index number i
When the identification number of the storage area 9 indicated by and the identification number of the transmission data of the current writing request match, the transmission data of the current writing request is overwritten in the storage area 9 indicated by the read index number i.

By writing the transmission data of the write request from the host computer 1 in each storage area 9 of the queue table 3 in this procedure, the data of the same identification number as the write request data is stored in the queue table 3. If it still exists in and is not read in, by overwriting the corresponding data,
It is possible to prevent a plurality of data having the same identification number from being simultaneously transmitted to the slave station 7.

[0015]

However, even in the data transmission apparatus which prevents a plurality of data having the same identification number from being simultaneously transmitted to the slave station 7 by the above-mentioned procedure, the following should be improved. There were challenges.

That is, the management area 1 of the queue table 3
0 read index number i and write index number j
Compare the ranges of and overwrite if there is the same identification number,
When data is written to each storage area 9 of the queue table 3 each time a write request is generated, whether the data to be written is already stored in the queue table 3 and is overwritten or newly written. Need to be determined from the write index number j, the read index number i, and the respective identification numbers in the management area 10 of the queue table 3.

When the judgment process including a plurality of steps shown in FIG. 32 is executed every time a write request is issued,
Not only does the processing load on the entire data processing device increase,
There is a concern that the data transmission processing speed between the host computer 1 and the slave station 7 may decrease.

The present invention has been made in view of the above circumstances, and the presence / absence flag indicating the presence / absence of unread data is provided in each area corresponding to each identification number in the queue table. In a state in which a plurality of data having
Another object of the present invention is to provide a data transmission device that can reduce the software processing load of writing data to the queue table when a write request occurs and improve the data transmission efficiency between information processing devices.

[0019]

According to a first aspect of the present invention, in order to solve the above-mentioned problems, transmission data including data and an identification number from a first information processing device is temporarily stored in a queue table in response to a write request. In the data transmission device that writes in each area formed in the area, and reads out each transmission data stored in each area in response to the read request and transmits the transmission data to the second information processing device, A write index number to be specified and a read index number to specify an area to read the transmission data, a storage index number to specify an area to store the transmission data to which each identification number belongs, and unread transmission data to the corresponding specified area There is a plurality of management storage units for storing presence / absence flags indicating presence / absence and presence / absence flags of the management storage unit corresponding to the identification number of the input transmission data in response to the write request. Write the transmission data to the area specified by the storage destination index number stored in the corresponding management storage unit, write the transmission data to the area specified by the write index number when the presence / absence flag is not set, and Write processing means for registering a flag presence and a storage destination index number, and when the read index number differs from the write index number in response to a read request, the transmission data in the area designated by the read index number is read and And a read processing means for registering the absence / presence of the presence / absence flag corresponding to the identification number of the transmission data.

According to a second aspect, in response to the write request, the transmission data including the data from the first information processing device and the identification number is once written in each area formed in the queue table, and the read request is issued. In accordance with the above, in a data transmission device which stores each transmission data stored in each region and transmits the transmission data to the second information processing device, a storage destination index number that specifies the region in which the transmission data to which each identification number belongs is stored and the corresponding index number. A plurality of management storage units for storing presence / absence flags indicating presence / absence of unread transmission data in the designated area, a bottom index number for designating an area to write the transmission data, and an area for reading the transmission data. The top index number, from index number and toe index number provided in each area to indicate the reading order, and the input transmission in response to the write request When the presence / absence flag of the management storage unit corresponding to the identification number of the data is not present, the transmission data is written in the area obtained by the bottom index number, and the from index number and toe index number are set in the corresponding area, and the presence / absence flag is set. When there is, the transmission data is written in the area specified by the storage destination index number stored in the corresponding management storage unit, and the to-index number of the area specified by the from-index number of the corresponding area and the to-index number of the corresponding area are specified. There is a writing processing means for modifying the from-index number of the area to be passed so that the corresponding area is passed, and a management storage section presence / absence flag corresponding to the identification number of the area designated by the top index number in response to a read request. When, the corresponding area and each area sequentially specified by the toe index number of the corresponding area Together sequentially reading out transmission data stored, in which a read processing means for setting without the presence flag of the identification number of each transmission data read.

According to a third aspect of the present invention, in the data transmission device according to the first or second aspect, the time from the writing time of the transmission data corresponding to the identification number of the relevant management area to the reading time of the relevant transmission data is provided in each management area. A timer for counting time and a diagnostic means for invalidating reading when the elapsed time measured by the timer exceeds a pre-stored permissible time.

According to a fourth aspect of the present invention, in the data transmission apparatus according to the first or second aspect, the transmission data includes a mask pattern for designating an effective bit position of the data in addition to the data and the identification number.

According to a fifth aspect of the present invention, in the data transmission apparatus according to the fourth aspect, each area of the queue table includes a mask pattern included in the transmission data and bits designated by the mask pattern among the data included in the transmission data. Store data and.

According to a sixth aspect of the present invention, in the data transmission apparatus according to the fourth aspect, in each area of the queue table, the mask pattern written at the present time when the write request is generated and the transmission data of the present write request are stored. A mask pattern formed of a logical sum of the included mask pattern is newly stored, and data consisting of bits designated by the newly stored mask pattern among the data included in the transmission data is stored.

According to a seventh aspect of the present invention, in the data transmission apparatus according to the first or second aspect, the queue table is composed of a plurality of unit queue tables, and the transmission priority of each data group stored in each unit queue table and per transmission text. And the maximum number of data to be transmitted.

When the transmission text is edited for data transmission, every time the transmission text is edited, data is transmitted from the unit queue table of the data group having high transmission priority until the maximum transmission data number per transmission text is reached. Is sequentially read, the transmission text is edited, and the data is transmitted.

According to an eighth aspect of the present invention, in the data transmission device according to the seventh aspect, when the number of data read from the unit queue table of the data group having a high transmission priority is less than the maximum number of transmission data per transmission text, sequential transmission is performed. Data is read from the unit queue table of the data group with low priority and the transmitted text is edited.

A ninth aspect of the data transmission apparatus according to the first or second aspect is that the queue table is composed of a plurality of unit queue tables, and the maximum transmission data number for each data group stored in each unit queue table is provided. .

When editing the transmission text for data transmission, each time the transmission text is edited, the data sequentially read from the unit queue table of each data group is edited into the transmission text until the maximum number of transmission data is reached. And send the data.

A tenth aspect of the data transmission apparatus according to the first or second aspect is that the queue table is composed of a plurality of unit queue tables, and the transmission priority and provisional maximum transmission data for each data group stored in each unit queue table. The number and the maximum number of transmitted data per transmitted text are provided.

When editing the transmission text for data transmission, each time the transmission text is edited, the transmission text is edited until the provisional maximum number of transmission data for each data group is reached, and after the provisional editing is completed, 1 When the maximum number of transmitted data per transmitted text is not reached, the data is read from the unit queue table of the data group with high transmission priority until the maximum transmitted data number per transmitted text is reached due to the second transmitted text editing. Is sequentially read, the transmission text is edited, and the data is transmitted.

In the data transmission apparatus of the present invention configured as above, when the write request is input from the first information processing apparatus, the presence / absence flag of the management storage unit corresponding to the identification number of the input transmission data is set. When there is, the transmission data is written in the area designated by the storage destination index number stored in the corresponding management storage unit, and when there is no presence / absence flag, the transmission data is written in the area designated by the write index number, and the corresponding management is performed. The presence / absence flag and the storage destination index number are registered in the storage unit.

When a read request is input from the second information processing device, when the read index number is different from the write index number, the transmission data in the area designated by the read index number is read and the corresponding transmission data is identified. Register the absence / presence flag corresponding to the number.

Therefore, every time a write request is made, it is determined whether the data in the write destination area is unread or read, and a complicated software process is performed to determine the identification number of the write destination area. Therefore, the efficiency of each of the writing process and the reading process for the queue table executed in response to the writing request and the reading request from each information processing device can be significantly improved.

Further, in the invention of claim 2, the bottom index number for designating the area for writing the transmission data, the top index number for designating the area for reading the transmission data, and the reading order provided in each of the areas. The from index number and toe index number shown are provided.

When a write request is issued from the first information processing apparatus, the presence / absence flag of the management storage unit determines whether or not there is unread transmission data in the area corresponding to the identification number.
When there is no unread data, the transmission data is written in the area designated by the bottom index number, and the from index number and toe index number are set in the corresponding area.

On the other hand, when there is an unread data, the transmission data is written in the area designated by the storage destination index number stored in the management storage section, and the from index number and toe index number are set in the corresponding area. When the flag is present, the transmission data is written in the area specified by the storage destination index number stored in the corresponding management storage section, and the to-index number of the area specified by the from-index number of the corresponding area and the to-index number of the corresponding area are written. The from index number of the area specified by is modified so that the corresponding area is passed.

As described above, the write index data and the toe index number stored in each area are linked and updated every time the write request data is written to each area. When a read request is issued, the transmission data having the same identification number stored in the queue table and having the oldest writing order is passed, and the respective transmission data can be read in the newest writing order and transmitted to the second information processing apparatus. .

In the third aspect, when the elapsed time from the writing time of the transmission data to the reading time of each management area exceeds the allowable time, it can be determined that some abnormality has occurred on the reading side. By diagnosing it as invalid, the reliability of the data transmission device is improved.

In the fourth aspect, the mask pattern is also stored in each area of the queue table at the same time. Since this mask pattern has a function of extracting a bit value of a necessary portion of the input data composed of a large number of bits, this mask pattern is used as the second information processing of the data transmitting device or the receiving side. It can be used effectively in equipment.

In the fifth aspect, only the data consisting of the bits designated by the mask pattern is stored in each area of the queue table. In claim 6, when writing the mask pattern in each area of the queue table, a logical sum of the mask pattern previously written and stored and the current mask pattern is written in the area as a new mask pattern. It is crowded.

Therefore, even if the mask pattern changes depending on the transmission order (write request order) within the same identification number, the transmission data is finally regulated by the least restrictive mask pattern, so that the required data is It is prevented from missing.

In the seventh to tenth aspects, when the number of transmission data is large, the queue table is divided into a plurality of unit queue tables and each transmission data is written, but the transmission data is transmitted to the second information processing device. In this case, it is assumed that it may be difficult to incorporate all the transmission data into one transmission text.

Then, the transmission texts are efficiently edited and transmitted under various conditions.
In the seventh aspect, when editing the transmission text, the data is sequentially read from the unit queue table of the data group having a high transmission priority and edited into the transmission text.

In the eighth aspect, when the transmitted text is less than the maximum number of transmitted data per transmitted text,
Data is sequentially read from the unit queue table of the data group having the lower transmission priority and edited into the transmission text.

In the ninth aspect, when the transmission text is edited, each time the transmission text is edited, the data is read sequentially from the unit queue table of each data group until the maximum transmission data number is reached. Edited.

According to the tenth aspect, when the transmission text is edited, each time the transmission text is edited, the text is edited until the provisional maximum number of transmission data for each data group is reached, and one transmission is made after the provisional editing is completed. When the maximum number of transmission data per text is not reached, the data is sequentially transferred from the unit queue table of the data group with high transmission priority until the maximum number of transmission data per transmission text is reached for the second text editing. The read and transmitted text is edited.

[0048]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing the schematic arrangement of a data transmission apparatus according to the first embodiment of the present invention.

Host computer 1 as first information processor
The transmission data composed of the data inputted from 1, the identification number for identifying the attribute of the corresponding data, the mask pattern for specifying the effective bit position of the corresponding data, and the timing signal (write request) for writing the transmission data are The data is received by the input data reading unit 12 and written in the queue table 13 in synchronization with the timing signal.

The transmission data editing unit 14 reads the transmission data written in the queue table 13 in response to a read request from the slave station 17 as the second information processing device, edits the transmission data into a transmission text, It transmits to the slave station 17 of the read request source via the transmitter 16. The transmission data is stored in the transmission data storage unit 15 as needed.

In the queue table 13, as shown in FIG. 2, n areas 19 for storing the identification number, data and mask pattern included in each transmission data are formed. A storage destination index number of 0 to (n-1) is assigned to each area 19. Further, in the queue table 13, for each identification number of 1 to m, an index number designating an area 19 in which the transmission data of the corresponding identification number is written and the presence or absence of unread transmission data in the corresponding area 19 are shown. M management storage units 21 that store the presence / absence flag 20 are formed.

Further, in the queue table 13, an area 22 for storing a write index number j for designating an area 19 for writing the transmission data and a read index number i for designating the area 19 for reading the transmission data is formed. ing.

Then, the input data writing unit 12 carries out the write processing of the transmission data to the queue table 13 according to the flow chart shown in FIG. When a write request is issued from the host computer 11, the state of the presence / absence flag 20 of the management storage unit 21 of the identification number of the transmission data for which the write request is made is checked (P21). When the presence flag 20 is absent (F = 0), the identification number, data and mask pattern of the input transmission data are written in the area 19 designated by the write index number j (P22). Then, the presence / absence flag 20 of the relevant management storage unit 21 is set to be present (F = 1) (P23).
Next, j is written as the storage destination index number in the relevant management storage unit 21 (P24).

Then, the write index number j is updated (P25), and when the updated write index number j reaches the final area 19 (P26), the write index number j is returned to the initial value (P26). P27).

In P21, if the presence / absence flag 20 of the management storage unit 21 for the identification number of the transmission data requested to be written is already present (F = 1), the process proceeds to P28, and the management storage unit 2 concerned.
The identification number, data, and mask pattern of the transmission data input this time are overwritten in the area 19 designated by the storage destination index number stored in 1.

Further, the transmission data editing unit 14 carries out a process of reading transmission data from the queue table 13 according to the flow chart shown in FIG. When a read request is input from the slave station 7, the read index number i stored in the area 22 is compared with the write index number j in P31.

If they do not match, the process proceeds to P32 to read the transmission data composed of the identification number, the data and the mask pattern stored in the area 19 designated by the read index number i. Then, the presence / absence flag 20 of the management storage unit 21 designated by the read identification number is canceled (F = 0) (P33).

Then, the read index number i is updated (P34), and when the updated read index number i reaches the final area 19 (P35), the read index number i is returned to the initial value (P36).

After that, the read transmission data is written in the transmission text (P37), and the process returns to P31 to compare the updated read index number i with the write index number j.

If there is a match, then all unread transmission data has been incorporated into the transmission text, and this flow chart ends. Next, the function of the mask pattern included in each transmission data will be described. As for the mask pattern, of the data included in the data of the transmission data, only the bits for which this mask pattern is set to [1] are valid, and the bits designated as valid are extracted and written in each area 19.

For example, in the order shown in FIG.
It is assumed that the respective data and the mask patterns are input. In this case, the upper stages of FIG. 5A and FIG.
5A and 5B, the lower part of FIG. 5A and FIG. 5B is a data value actually written in each area 19 designated by the corresponding identification numbers 1 and 2 of the queue table 13. And its order.

All the mask patterns of the identification number 1 are [F
FFF], all the bits of each input data are valid and are overwritten in order in the area 19 as they are. Then, at the time when the writing process of the eight transmission data shown in FIG. 29 is completed, the data of the last input transmission data is displayed in the area 19 of the identification number 1 as shown at the right end of FIG. [3456] and mask pattern [FFFF]
Is remembered.

On the other hand, each mask pattern with the identification number 2 is not [FFFF]. The first data [1234] is limited by the mask pattern [000F], and [0004] is written in the area 19 as shown in FIG.

The second data is [5678] and the mask pattern is [0408]. There, the stored first mask pattern [000F] is input and
The logical sum of the th mask pattern [0408] is set to 2
The mask pattern [040F] is written in the area 19 as the th mask pattern. Then, the second data [5678] is limited by the written mask pattern [040F],
[040C] is written in area 19.

Then, as shown at the right end of FIG.
[945 corresponding to the last input data [3456]
The mask pattern [F4FF] created by the logical sum of the data of C] and the preceding mask pattern is stored.

As a result, when the read request is issued from the slave station 17 at the time when the writing process of the eight transmission data shown in FIG. 29 is completed, the transmission text 23 shown in FIG. 6 is finally created. It is transmitted to the child station 17 via the transmitter 16.

In the data transmission apparatus of the first embodiment configured as described above, when a write request is input from the host computer 11, the presence / absence flag 20 of the management storage unit 21 corresponding to the identification number of the input transmission data is set. When there is (F = 1), the transmission data is written in the area 19 designated by the storage destination index number stored in the relevant management storage unit 21.
On the other hand, when the presence flag 20 is absent (F = 0), the transmission data is written in the area 19 designated by the write index number j, and the presence / absence flag 20 is present and the storage destination index number is registered in the relevant management storage unit 21. To be done.

Also, When a read request is input from the slave station 17, the read index number i is changed to the write index number j.
, The transmission data in the area 19 designated by the read index number i is read, and the presence / absence flag 20 corresponding to the identification number of the transmission data is registered as none.

Therefore, the transmission data having the same identification number are sequentially overwritten in the same area 19, and when a read request occurs, only the last valid transmission data written is incorporated in the transmission text 23 and the child data is transmitted. Since it is transmitted to the station 17, a plurality of transmission data having the same identification number are not transmitted at one time.

Further, every time a write request is generated, a complicated software process for determining whether the data in the write destination area 19 is unread or read and determining the identification number of the write destination area 19 is performed. Need not be performed, and the host computer 11 and slave station 1
It is possible to greatly improve the processing efficiency of the writing process and the reading process for the queue table 13 executed in response to the writing request and the reading request from 7.

Further, since the mask pattern to be written in the area 19 is the mask pattern of the logical sum of the already stored mask pattern and the newly input mask pattern, even in the same identification number, the transmission order (write request order) )
Even if the mask pattern changes due to, the transmission data is finally regulated by the mask pattern with the least restriction, so that the necessary data is prevented from being lost.

In the first embodiment, as shown in FIG. 5, the mask pattern to be written in the region 19 is the logical sum of the mask pattern already stored and the newly input mask pattern. As shown in FIG. 7, it is also possible to simply overwrite a mask pattern that has been newly input with the mask pattern that has already been written as it is.

Further, as shown in FIG. 6, in the first embodiment, the transmission text 23 transmitted from the transmission section 16 to the slave station 17 incorporates the identification number, the data and the mask pattern. As shown in, the mask pattern may be omitted and only the identification number and data may be incorporated.

Further, in the embodiment shown in FIGS. 1 to 8 configured as described above, it is assumed that the writing order of the transmission data in each area 19 is not the serial number order, as shown in FIG. 9A. Also, as shown in FIG.
It is read in the order of the identification numbers, embedded in the transmission text 23, and transmitted to the child station 17.

(Second Embodiment) FIG. 10 is a diagram showing the stored contents of a queue table 13a incorporated in a data transmission apparatus according to the second embodiment of the present invention. Since the configuration other than the queue table 13a is almost the same as that of the data transmission apparatus of the first embodiment shown in FIG. 1, detailed description will be omitted.

In each management storage unit 21a corresponding to each identification number of the queue table 13a incorporated in the data transmission apparatus of the second embodiment, in addition to the storage destination index number and presence / absence flag 20, a timer value is set. 24 is set. This timer value is the area 1 specified by the index number.
When new data is written in 9, it is reset (restarted) to 0. That is, this timer value measures the elapsed time since the new data was written in the area 19.

Then, when a write request is issued from the host computer 11, the input data writing unit 12 executes the writing process to the queue table 13a according to the flowchart of FIG. The same parts as those in the flowchart of FIG. 3 are designated by the same reference numerals. Therefore, only different parts will be described.

When the writing process for the newly input transmission data in the designated area 19 is completed in P22 to P24, P
24a, the timer value of the corresponding management storage unit 21a is set to 0.
To reset (restart).

Similarly, when the writing process of the newly input transmission data in the designated area 19 in P28 is completed, P2 is set.
At 8a, the timer value of the corresponding management storage unit 21a is reset to 0 (restart).

When a read request is issued from the slave station 17, the transmission data editing unit 14 executes a process of reading transmission data from the queue table 13a according to the flowchart of FIG.
The same parts as those in the flowchart of FIG. 4 are designated by the same reference numerals. Therefore, only different parts will be described.

Read index number i in P32-33
When the data is read from the area 19 designated by, the timer value of the corresponding management storage unit 21a is checked in P33a, and if this timer value exceeds the limit value, it means that some abnormality has occurred. Judgment, the transmission text of the corresponding data 23
Stop writing to.

In the data transmission apparatus of the second embodiment having such a configuration, if the transmission data stored in each area 19 is not read out for a long period of time exceeding the limit time, it is stored in the corresponding area 19. Identification number, data,
The mask pattern is invalid.

That is, if there is no read request even though the data is written in the queue table 13a, there is a possibility that some problem has occurred in the transmission data editing unit 14. In this way, when the timer value exceeds the limit time and is read, old information is read and the value is transmitted to the slave station 17, which may cause an abnormal state due to controllability and operability. Is strong.

Therefore, as in the embodiment, the transmission of the data judged to have the possibility of the abnormality occurrence is stopped and the slave station 17
To prevent the occurrence of abnormalities. It is also possible to incorporate the abnormality occurrence information into the transmission text 23 and transmit it to the child station 17. In this case, the slave station 17 can recognize the abnormality of the signal path corresponding to the identification number of the abnormality occurrence.

(Third Embodiment) FIG. 13 is a diagram showing the stored contents of a queue table 13b incorporated in a data transmission apparatus according to the third embodiment of the present invention. Since the configuration other than the queue table 13b is almost the same as that of the data transmission device of the first embodiment shown in FIG. 1, detailed description thereof is omitted.

In the queue table 13b incorporated in the data transmission apparatus of the third embodiment, m management storage sections 21a corresponding to the respective identification numbers 1 to m and 0 to (n-
N areas 19a to which the index numbers of 1) are attached
And one region 25 is formed.

In the area 25, a Bttom index number for designating the write area 19a of the transmission data of the write request, and a Top area 19a for designating the read start area 19a of the transmission data in response to the read request. The (top) index number is stored.

Further, in each management storage unit 21a, FIG.
Similar to the second embodiment shown in FIG. 3, the index number of the storage destination that specifies the area 19a that stores the transmission data corresponding to its own identification number, the presence / absence flag 20, and the timer value 24 are stored.

Further, in each area 19a, in addition to the identification number, data and mask pattern which form the transmission data,
From (from) index number and to indicating the reading order
(To) The index number is written.

Next, each index number will be described.
When write requests are sequentially input from the host computer 11, each transmission data of each write request is sequentially stored from the area 19a designated by the number next to the bottom index number.
On the other hand, when the read request is input from the slave station 17, the transmission data is sequentially read from the area 19a designated by the top index number, the transmission data editing unit 14 edits the transmission text, and the transmission request is transmitted via the transmission unit 16 to the child of the request source. Send to station 17.

The from index number set in each area 19a is an index number that specifies the area 19a to be read immediately before. Moreover, it is set in each area 19a.
The to index number is an index number that specifies the area 19a to be read next.

In the initial state where no write request is input from the host computer 11, (operation a) of FIG. 14 and FIG.
As shown in (state a) of, the bo of the queue table 13b is
Both the ttom index number and the top index number are [FFFF], and the presence / absence flag 20 of each management storage unit 21a is absent (F = 0).

Here, in order to make the explanation of the operation easy to understand,
It is assumed that the transmission data of each identification number is input in the order shown in FIG. The mask pattern is omitted. When a write request of the first [1000A] occurs,
The identification number 1 and the data 000A are written in the area 19a of the index number 0, which is the number next to the Bottom index number of [FFFF], and the top index number is the top index number in the from index number that specifies the area 19a to be read immediately before. Set [FFFF]. At this point, to
The index number is unknown and [FFFF] is set.

Then, the index number [0] for specifying the corresponding area 19a is written in the top index number indicating the read start position. And set the bottom index number to 1
Just update to [0]. Further, the storage destination index number [0] is set in the management storage unit 21a corresponding to the identification number 1 of the transmission data of the relevant area 19a, and the presence / absence flag 2 is set.
Set 0 to Yes (F = 1).

When the second [2000B] write request is generated, the management storage unit 21 of the identification number of the corresponding transmission data is generated.
After confirming that the presence / absence flag 20 of a is absent (F = 0),
The transmission data of the input write request is written in the area 19a of the index number 1 which is the number next to the bottom index number of [0]. And the area 1 to be read one before
[0] is set to the from index number that specifies 9a. Furthermore, the to index number of the area 19a designated by this from index number [0] is set to the own area 19
Let a be specified as [1]. The own to index number is [FFFF].

When the third [3000C] write request is generated, the management storage unit 21 of the identification number of the corresponding transmission data is generated.
After confirming that the presence / absence flag 20 of a is absent (F = 0), the transmission data of this input write request is designated by the area 1 of the index number [2] designated by the number next to the bottom index number.
Write to 9a.

FIG. 1 shows the storage state of each area of the queue table 13b in the state where the write processing for the first to third transmission data shown in (Operation b) of FIG. 14 has been completed.
5 (state b). As shown in the figure, [1,000 A], [2
Each transmission data of [000B] and [3000C] is stored. Then, bo that specifies the next write destination area 19a
The ttom index number is set to [2], and the top index number designating the read start area 19a remains unchanged at [0].

Then, for example, in the area 19a of the index number of [1], the index number of [0] which is read ahead of itself is stored as the from index number, and the index number is read after one from itself [2]. The index number of is stored as the to index number.

That is, the transmission data is [1000
A], [2000B], and [3000C] are linked (connected) in this order. Therefore, if a read request is issued from the slave station 17 at this point, it indicates that the read is performed in the same order as the above-described write order.

Next, the fourth transmission data [2000
When the write request of D] is generated, as shown in (operation c) of FIG. 14 and (state c) of FIG. 16, the corresponding identification number [2]
Presence / absence flag 20 of the management storage unit 21a of F exists (F = 1)
Therefore, the corresponding transmission data [2000D] is overwritten in the area 19a of the index number [1] specified by the storage index number of the management storage unit 21a of the identification number [2]. Then, the bottom index number is set to [1], which is the index number of the area 19a that was finally written.

Then, the area 19a to index number of the index number [0] to be read immediately before that specified by the from index number of the area 19a is changed to [2] specified by its own to index number. The from index number of the area 19a of [2] designated by its own to index number is changed to [1] designated by its own from index number.

Then, the from index number of its own area 19a is set to the index number [2] of the area 19a of [2] designated by its own to index number. Furthermore, the own to index number is rewritten to [FFFF] indicating undecided.

In this way, when the transmission data of the same identification number as the transmission data of the write request remains in the unread state, it is overwritten on the unread transmission data, and at the time of the read request, this new data is newly added. In order that the read order of the overwritten transmission data is later than the transmission data of the other area 19a written earlier, the to of each area 19a read before and after itself is
The index number and the from index number are reset so as to pass the area 19a.

Specifically, in (state c) of FIG. 16, the transmission data is [1000A] → [2000B] → [3
000C] were linked (connected) in the reading order, but in (state d) of FIG. 16, [1000A] → [300
This indicates that the reading order has changed from 0C] to [2000D].

Similarly, the fourth [100] in FIG.
The operation of writing the transmission data of [0E] to the queue table 13b is shown in (operation d) of FIG. 14, and the state in which the corresponding transmission data is written in the queue table 13b is shown in (status d) of FIG.

In this state, since the transmission data belonging to the identification number [1] is also overwritten, this area 19a
The top index number having the index number of [FFFF] specified by the foom index number of is changed to [2] which is its own to index number.

Furthermore, the queue table 13b of the final (fifth) [2000F] transmission data in FIG.
14 (operation e) shows the write operation for the, and FIG. 17 (status e) shows the state in which the corresponding transmission data is written in the queue table 13b.

In this state, this final (fifth)
In the state in which the transmission data of [2000F] has been written, the top index number is [2]. Therefore, if a read request is input from the slave station 17 at this point, FIG.
As shown in, the transmission data of [3000C] stored in the area 19a designated by the index number of [2] is first read, and the index number of [0] designated by the to index number of the relevant area 19a. Area 19a
[1000E] stored in is read. Finally, [2000F] stored in the area 19a having the index number [1] specified by the to index number of the area 19a is read. Then, it is incorporated in the transmission text 23 in the same order and transmitted to the child station 17.

Therefore, in response to the read request, the process shown in FIG.
It is not unconditionally read in the order of the identification number shown in (b), and the identification number and the data written in the queue table 13b later are preferentially output.

In such read order control, when the content of the transmission data requested to be written in the queue table 13b indicates the operation order of the equipment, the identification number and the data are prioritized after the data transmission. This is very effective for a system in which the sequence of operations occurs before and after the procedure and the sequence of operations is incorrect.

(Fourth Embodiment) FIG. 19 is a block diagram showing a schematic structure of a data transmission device according to a fourth embodiment of the present invention. The same parts as those of the data transmission apparatus of the first embodiment shown in FIG. 1 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions is omitted.

In the fourth embodiment, there are provided a total of I slave stations 17a from the first computer to the Ith computer to which the transmission data should be finally transmitted from the host computer 11. The key table 13c for storing each transmission data of the write request from the high-order computer 11 is composed of 1 to I unit queue tables 26 corresponding to the respective slave stations 17a. .

FIG. 20 is a schematic diagram showing a schematic structure of the key table 13c. The unit key table 26 corresponding to each of the first to I-th station numbers forming the key table 13c has the same structure as the key table 13 incorporated in the first embodiment shown in FIG.

Each transmission data of the write request output from the host computer 11 includes the station number in addition to the above-mentioned identification number, data and mask pattern, and the input data writing unit 12 inputs the data. The respective transmission data are written in the unit queue table 26 corresponding to the station numbers of the first to I-th station numbers included in the transmission data in the same procedure as in the first embodiment.

Each data group stored in each unit queue table 26 constituting the queue table 13c is individually read out by the transmission data editing section 14 and incorporated in the transmission text to be transmitted to the corresponding data via the line switching section 27. It is transmitted to the slave station 17a having the station number to which the group belongs.

Even in the data transmission apparatus of the fourth embodiment configured as described above, the writing process and the reading process of the transmission data with respect to the unit queue table 26 corresponding to each slave station 17a are the same as those shown in FIG. Since the procedure is similar to that of the first embodiment, the same effect as that of the first embodiment can be obtained.

(Fifth Embodiment) FIG. 21 is a block diagram showing the schematic arrangement of a data transmission device according to the fifth embodiment of the present invention. The same parts as those of the data transmission device of the fourth embodiment shown in FIG. 19 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions is omitted.

In the fifth embodiment, each transmission data output from the host computer 11 is classified into a plurality of types such as control-A, control-B, ..., Control-J according to the data type. . Then, each transmission data of the write request input from the host computer 11 is sorted by the distribution unit 28 via the input data writing unit 12 for each data type from the above-mentioned control-A to control-J. Each sorted transmission data is written in each unit queue table 26a corresponding to each control-A to control-J forming the queue table 13d.

The transmission data editing section 14a has a memory 29 for storing the maximum number of transmission data for each data group of control-A to control-J to be incorporated in one transmission text, and maximum transmission data for one transmission text. Memory 30 for storing numbers
And a memory 31 that stores various transmission priorities including mutual control-A to control-J data groups.

Whether or not to set each condition for each of the memories 29 to 31 and what value to set when setting each condition, the operator of this data transmission apparatus operates an operation unit (not shown). It can be arbitrarily selected and set via the.

Then, the communication data editing section 14a uses the maximum number of transmission data for each data group stored in each of the memories 29, 30, 31 and the maximum number of transmission data for each transmission text, and between each data group. Each data group stored in each unit queue table 26a is read out based on an editing condition such as a transmission priority order, incorporated into one or a plurality of transmission texts, and transmitted to the slave station 17 via the transmission unit 16. To do.

The format of each transmission text created by the communication data editing unit 14a when various conditions are set in each of the memories 29 to 31 will be sequentially described below. (Condition 1) No condition is set (FIG. 22) FIG. 22 shows a transmission text 32 that is edited by the communication data editing unit 14a and transmitted to the slave station 17 when no conditions are set in the memories 29 to 31. It is a figure which shows the format of. The transmission text 32 is a variable length text whose text length can be freely set.

Control near the beginning of this transmitted text 32
The number of transmitted data is set for each data group of A to control,
After that, each data group of control-A to control-J is set. (Condition 2) Condition setting in the memory 30 (FIG. 23) In the case where the maximum transmission data number per one transmission text is set in the memory 30 and the maximum transmission data number is set to [6], for example , All the transmission data included in the transmission text 32 in FIG. 22 cannot be transmitted at the same time, so each transmission data is divided into a plurality of transmission texts 33 and transmitted as shown in FIG.

Specifically, as shown in FIG. 23, each time when each transmission text 33 is edited, each unit queue is processed until the number of transmission data included in the transmission text (transmission data number) reaches the maximum transmission data number. Each data group read from the table 26a is decomposed in each transmission data unit and set in order in each transmission text 33 of (a) to (e).
Therefore, five pieces of transmission data, which is less than the maximum number of transmission data [6], are incorporated in the finally edited transmission text shown in (e).

The reason for setting the maximum value of the number of data to be incorporated in this one transmission text is to make the time intervals for transmitting (receiving) a specific word address as uniform as possible. In other words, it is wasteful to transmit / receive at a time interval smaller than the cycle of the time interval, and conversely, if it is too long, the controllability is likely to be impaired.

(Condition 3) Condition setting-1 in the memories 29 and 30 (FIG. 24) Further, the maximum number of transmission data per transmission text is set in the memory 30, and one transmission text is incorporated in each memory 29. When the maximum number of transmission data of each data group is set and the value is set to [2], each data group is dispersed into a plurality of transmission texts 34 as shown in FIG. Be incorporated.

More specifically, the transmission text 34 at the beginning (a) and the transmission text 34 at the second (b) each include two transmissions belonging to control-A, control-B, and control-J. The data is set. However, after the third (c)
(E) Since each transmission text 34 of (e) does not reach the maximum number of transmission data [6] per transmission text 34, the number of data of the same type exceeds 2, so The short transmission text 34 does not reach the transmission data number [6].

(Condition 4) Condition setting in the memories 29 and 30-2 (FIG. 25) Further, the maximum number of transmission data set in each memory 29 can be set to different values depending on the type of data group. For example, the maximum number of transmission data of control-A is set to [3],
FIG. 2 shows each transmission text 35 created under the condition that the maximum transmission data number of the control-B data group is set to [1] and the maximum transmission data number of the control-J data group is set to [2].
It is shown in FIG.

As shown in the figure, the transmission texts 35 (a), (b) and (c) from the beginning to the third have the same format with the maximum number of transmission data [6] per transmission text, (E) send text 35 and 4
The transmission text 35 of the (e) th is a short transmission text 35 that is less than the maximum transmission data number [6].

(Condition 5) Condition setting-3 in the memories 29 and 30 (FIG. 26) Further, the maximum number of transmission data set in each memory 29 is set to a value different from each other according to the type of data group, and The maximum number of transmission data can be set by the combination between groups. For example, the maximum number of transmission data of control-A is [3]
26 and each transmission text 36 created under the condition that the total number of data of the control-B data group and the control-J data group is set to [3] or less. Shown in.

In this case, three pieces of each control-A transmission data are incorporated into each transmission text 36, but since the total number of each control-B transmission data and each control-J transmission data is three. , If the transmission-priority of the data group of control-B is higher than that of the data group of control-J, the transmission data 36 of the head (a) does not include the transmission data of control-J. On the contrary, the control is applied to each of the third (c) and subsequent transmission texts 36-
B transmission data is not included.

(Condition 6) Conditions are set in the memories 29, 30 and 31 (FIG. 27) Further, it is assumed that the following priority transmission order is set in the memory 31. Maximum number of transmitted data> Control-A data> Control-B data>
Control-J data In this case, in each of the first (a) and second (b) transmission texts 37, control-A transmission data, control-B transmission data, and control-J transmission data are 2 each. It is incorporated evenly. At this stage, the transmission data that is not embedded is controlled by
Since the transmission data of A is 6, the transmission data of control-B is 1, and the transmission data of control-J is 4, the maximum transmission data number 6 with high transmission priority is included in the third transmission text 37.
In order to satisfy the above condition, the transmission data of control-A is set to 3, the transmission data of control-B is set to 1, and the transmission data of control-J is set to 2.

In this case, the maximum data number 2 incorporated in one transmission text of the control-A transmission data is ignored because the transmission priority is low and becomes 3. Then, in the final (d) transmission text 37, the remaining control-A transmission data of 3 and the control-J transmission data of 2 are incorporated. In this case, the transmission data number of the transmission text 37 is 5.

The features of the data transmission apparatus of the fifth embodiment configured as described above will be described. Transmission data editing unit 14a
The transmission data is sequentially read from each unit queue table 26b and embedded in the transmission text. However, if there is no second editing, the transmission data is edited with the maximum number of transmission data of each data type or less. However, if there is a variation in the number of data of each data group stored in each queue table 26a, it will be edited and transmitted with a size less than one transmission text,
As a result, there is a concern that wasteful and inefficient transmission may be repeated.

Therefore, in the data transmission device of the fifth embodiment, the number of transmission data to be incorporated in the transmission text 37 is 1.
If the maximum number of transmission data per transmission text is not reached, the unit queue table 26b of the data group with high transmission priority is kept until the maximum transmission data number per transmission text is reached because of the second transmission text editing. The transmission data is sequentially read, and the transmission text is edited and the slave station 17
Sending data to.

If the number of data read from the queue table 26a of the data group having a high transmission priority is less than the maximum number of transmission data per one transmission text,
It is read from the queue table of the data group with low transmission priority and incorporated in the transmission text.

Therefore, a data group having a high transmission priority can be efficiently transmitted to the intended slave station 17 with little waste. Note that the present invention is not limited to the above embodiments. In the second embodiment shown in FIG. 10, each management storage unit 2 in which the timer value 24 corresponds to the identification number
It was set within 1a. However, it is possible to set one common timer value for the queue table 13a. In this case, if the elapsed time from the write request generation time for the entire queue table 13a to the read request generation exceeds the allowable value, it is determined that an abnormality has occurred.

Further, the timer value can be set also in the fifth embodiment shown in FIG. That is, the timer value is set for each unit queue table 26a that temporarily stores each data group of control-A, control-B, ..., Control-J. In such a case, if the timer value exceeds the allowable value, the presence / absence flag 20 of the management storage unit 21a corresponding to all the identification numbers of the corresponding queue table 28a is absent (F
= 0).

[0139]

As described above, in the data transmission apparatus of the present invention, the queue table is provided with the presence / absence flag indicating the presence / absence of unread data in each area corresponding to each identification number, and the write request is issued. When it occurs, the transmission data is written in the corresponding area in the queue table after checking the presence flag.

Therefore, while preventing a plurality of data having the same identification number from being transmitted to the read request source at the same time, the processing load of data writing to the queue table when a write request is generated is reduced. The data transmission efficiency between the information processing devices can be reduced.

Further, an index number for specifying the writing destination and the reading destination area for the queue table and an index number for specifying the reading order are provided. Therefore, when the read request is issued, the read order of the transmission data stored in the queue table is not limited to the identification number order, and various read orders such as reading from the most recently written transmission data can be set. It is possible to secure diversity of data transmission between devices.

Further, when the data read from the queue table is incorporated into the transmission text and transmitted to the second information processing apparatus, the transmission data group corresponding to the transmission text is set according to the type of transmission data and the number of transmission data. Included conditions can be set arbitrarily.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a data transmission device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing stored contents of a queue table incorporated in the data transmission device.

FIG. 3 is a flowchart showing a write processing operation for a queue table of an input data writing unit incorporated in the data transmission device.

FIG. 4 is a flowchart showing a read processing operation for a queue table of a transmission data editing unit incorporated in the same data transmission device.

FIG. 5 is a diagram showing a comparison between write request data for the data transmission device and stored data written in a queue table.

FIG. 6 is a diagram showing a transmission text created by a transmission data editing unit in the data transmission device.

FIG. 7 is a diagram showing another comparison between the write request data for the data transmission device and the storage data written in the queue table.

FIG. 8 is a diagram showing another transmission text created by a transmission data editing unit in the data transmission device.

FIG. 9 is a diagram showing a relationship between a write request sequence and a read sequence of each transmission data to the data transmission device.

FIG. 10 is a diagram showing stored contents of a queue table incorporated in the data transmission device according to the second embodiment of the present invention.

FIG. 11 is a flowchart showing a write processing operation for a queue table of an input data writing unit incorporated in the data transmission device.

FIG. 12 is a flowchart showing a read processing operation for a queue table of a transmission data editing unit incorporated in the same data transmission device.

FIG. 13 is a diagram showing stored contents of a queue table incorporated in a data transmission device according to a third embodiment of the present invention.

FIG. 14 is a schematic diagram showing a write processing operation for a queue table of an input data writing unit incorporated in the data transmission device.

FIG. 15 is a diagram showing a storage state of a corresponding queue table at each writing process to the queue table in the data transmission device.

FIG. 16 is a diagram showing a storage state of the corresponding queue table at the time of each writing process to the same queue table.

FIG. 17 is a diagram showing a storage state of a corresponding queue table at the time of each writing process to the same queue table.

FIG. 18 is a diagram showing a reading order of transmission data of a transmission data editing unit in the data transmission device.

FIG. 19 is a block diagram showing a schematic configuration of a data transmission device according to a fourth embodiment of the present invention.

FIG. 20 is a diagram showing stored contents of a queue table incorporated in the data transmission device.

FIG. 21 is a block diagram showing a schematic configuration of a data transmission device according to a fifth embodiment of the present invention.

FIG. 22 is a diagram showing a transmission text created based on condition 1 by a transmission data editing unit in the same data transmission device.

FIG. 23 is a diagram showing a transmission text created based on condition 2 by a transmission data editing unit in the same data transmission device.

FIG. 24 is a diagram showing a transmission text created based on condition 3 by a transmission data editing unit in the data transmission device.

FIG. 25 is a diagram showing a transmission text created based on condition 4 by a transmission data editing unit in the data transmission device.

FIG. 26 is a diagram showing a transmission text created based on condition 5 by a transmission data editing unit in the same data transmission device.

FIG. 27 is a diagram showing a transmission text created based on condition 6 by a transmission data editing unit in the same data transmission device.

FIG. 28 is a block diagram showing a schematic configuration of a general data transmission device.

FIG. 29 is a diagram showing a transmission request sequence of each transmission data to the data transmission device.

FIG. 30 is a diagram showing a transmission text created by a transmission data editing unit in the general data transmission apparatus.

FIG. 31 is a diagram showing stored contents of a queue table incorporated in the general data transmission apparatus.

FIG. 32 is a flowchart showing the write processing operation for the queue table of the input data writing unit incorporated in the general data transmission apparatus.

[Explanation of symbols]

11 ... Host computer 12 ... Input data writing unit 13, 13a, 13b, 13c ... Queue table 14, 14a ... Transmission data editing unit 16 ... Transmission unit 17, 17a ... Slave station 19, 19a ... Area 20 ... Presence / absence flag 21, 21a ... Management storage unit 22, 25 ... Area 23, 32, 33, 34, 35, 36, 37 ... Transmission text 24 ... Timer value 26, 26a ... Unit queue table 27 ... Line switching unit 28 ... Distribution unit 29, 30, 31 ... Memory

Claims (10)

[Claims] 1. In response to a write request, transmission data including data and an identification number from the first information processing device is once written in each area formed in the queue table, and in response to a read request. A data transmission device for reading each transmission data stored in each region and transmitting the transmission data to a second information processing device, wherein a write index number designating a region to write the transmission data and a region for reading the transmission data A plurality of managements that store a read index number that specifies a read index number, a storage index number that specifies an area to store the transmission data to which each identification number belongs, and a presence flag that indicates the presence or absence of unread transmission data in the corresponding designated area When a storage unit and a management storage unit presence / absence flag corresponding to the identification number of the input transmission data in response to the write request are stored in the corresponding management storage unit The transmission data is written in the area designated by the storage destination index number, the transmission data is written in the area designated by the write index number when the presence / absence flag is absent, and the presence / absence flag is present in the corresponding management storage unit and the storage destination. Write processing means for registering an index number, and when the read index number is different from the write index number in response to the read request, the transmission data in the area designated by the read index number is read, and
A data transmission device, comprising: a read processing unit that registers the presence / absence flag corresponding to the identification number of the corresponding transmission data. 2. The transmission data including the data and the identification number from the first information processing apparatus is once written in each area formed in the queue table in response to the write request, and the read data is also transmitted in response to the read request. A data transmission device for reading out each transmission data stored in each area and transmitting the transmission data to a second information processing device, a storage destination index number for specifying an area for storing the transmission data to which each identification number belongs, and a corresponding designation A plurality of management storage units for storing presence / absence flags indicating presence / absence of unread transmission data in an area, a bottom index number for designating an area in which the transmission data is written, and an area for reading the transmission data Top index number, from index number and toe index number provided in each area new and indicating the reading order, and in response to the write request. When the presence / absence flag of the management storage unit corresponding to the identification number of the input transmission data is absent, the transmission data is written in the area obtained by the bottom index number, and the from index number and toe index number are set in the corresponding area. When the presence flag is present, the transmission data is written in the area specified by the storage destination index number stored in the corresponding management storage unit, and the to-index number and the corresponding area of the area specified by the from-index number of the corresponding area are written. Corresponding to the identification number of the area designated by the top index number in response to the read request, and the write processing means for correcting the from index number of the area designated by the to index number so that the corresponding area is passed. When the presence / absence flag of the management storage unit is present, the applicable area and The transmission data stored in the respective areas with successively read is sequentially designated by index number, the data transmission apparatus and a reading process means for setting without the presence flag of the identification number of each transmission data read. 3. A timer provided in each of the management areas, for measuring the elapsed time from the writing time of the transmission data corresponding to the identification number of the corresponding management area to the reading time of the corresponding transmission data, and the elapsed time measured by this timer. 3. The data transmission device according to claim 1, further comprising a diagnostic means for invalidating the reading when the time exceeds a pre-stored permissible time. 4. The data transmission device according to claim 1, wherein the transmission data includes a mask pattern for designating an effective bit position of the data, in addition to the data and the identification number. 5. A mask pattern included in the transmission data and data consisting of bits designated by the mask pattern in the data included in the transmission data are stored in each area of the queue table. The data transmission device according to claim 4, which is characterized in that: 6. A mask formed by a logical sum of a mask pattern written at the present time when a write request is generated and a mask pattern included in transmission data of the current write request, in each area of the queue table. 5. The data transmission device according to claim 4, wherein a pattern is newly stored, and among the data included in the transmission data, data consisting of bits designated by the newly stored mask pattern is stored. . 7. The queue table is composed of a plurality of unit queue tables, and is provided with a transmission priority of each data group stored in each unit queue table and a maximum number of transmission data per one transmission text for data transmission. When editing the transmission text, each time the transmission text is edited, the data is sequentially read from the unit queue table of the data group having the high transmission priority until the maximum transmission data number per the transmission text is reached, and the transmission text is read. The data transmission device according to claim 1, wherein the data is edited and transmitted. 8. A unit queue table for a data group having a sequentially lower transmission priority when the number of data read from the unit queue table for the data group having a higher transmission priority is less than the maximum number of transmission data per one transmission text. 8. The data transmission device according to claim 7, wherein the data is read out and the transmitted text is edited. 9. The queue table is composed of a plurality of unit queue tables, the maximum transmission data number for each data group stored in each unit queue table is provided, and the transmission text is edited when the transmission text is edited for data transmission. 3. The data transmission according to claim 1 or 2, characterized in that, each time the data is edited, the data sequentially read from the unit queue table of each data group is edited into a transmission text until the maximum number of transmission data is reached, and the data is transmitted. apparatus. 10. The queue table is composed of a plurality of unit queue tables, and the transmission priority and the provisional maximum number of transmission data for each data group stored in each unit queue table and 1 are set.
The maximum transmission data number per transmission text is provided, and when editing the transmission text for data transmission, each time the transmission text is edited, the text is edited until the provisional maximum transmission data number for each data group is reached, After the provisional editing is completed, when the maximum transmission data number per 1 transmission text is not reached, the transmission priority is kept until the maximum transmission data number per 1 transmission text is reached for the second transmission text editing. 3. The data transmission device according to claim 1, wherein data is sequentially read from a unit queue table of a high data group, the transmission text is edited, and the data is transmitted.