KR101593216B1 - On-the-fly data transmission system and method for transmitting data to divide read and write period thereof - Google Patents

Abstract

The present invention relates to an on-the-fly type data transmission system which can optimize a data transmission rate to transmit data by using an on-the-fly method, a data transmission rate optimization method thereof, and a slave device for the same. The slave device executes a read operation to extract datagram on the tip of a received data frame and executes a write operation by inserting the datagram to be transmitted to a master device into an end of the received data frame. Accordingly, the on-the-fly type data transmission system can simplify the process in a slave device and reduce process delays.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-the-fly data transmission system and a data transmission method for distinguishing between a read period and a write period.

The present invention relates to an industrial data transmission technology, and more particularly, to an industrial data transmission technology in which an on-the-fly transmission method for optimizing a data transmission rate while distinguishing between reading and writing cycles in a slave device, The present invention relates to a data transfer system and a data transfer method for distinguishing between the read and write cycles.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

Industrial data transmission technology has been developed based on 'Industrial Ethernet', and considering PROFINET (RT, IRT), POWERLINK, EtherNet / IP, EtherCAT and SERCOS Ⅲ, .

Industrial networks based on the Ethernet communication method are widely used as the advantages of ease of configuration and scalability. However, since a data format of the Ethernet standard is used, when a small amount of data such as control data is transmitted, There is a drawback to add information.

In particular, as the next generation power network develops, there is a need for data transfer technology between mass objects to transmit data between more than 1,000 devices more efficiently.

Japanese Patent Publication No. 4107110, Registered on Apr. 11, 2008 (Name: FIELD BUS SYSTEM, CNNECION CONFIRMING METHOD, MASTER AND SLAVE)

The present invention has been proposed to solve the problems of the conventional Ethernet based industrial network. In particular, in transmitting data on the fly, it is necessary to optimize the data transfer rate while distinguishing the read and write cycles in the slave device And to provide a data transmission method which distinguishes between the read and write cycles.

As a means for solving the above-mentioned problems, the present invention provides a master device and a slave device connected in a ring form for transmitting data in an on-the-fly manner and a plurality of slave devices, Two modes are alternately performed. In the first mode, a first data frame including a plurality of datagrams corresponding to a plurality of slave devices is transmitted. In the second mode, a second data frame including only a header is transmitted , The plurality of slave devices alternately performing a first mode and a second mode, wherein in the first mode, the first data frame is received and a datagram located at a front end based on the header of the first data frame is received Extracts the response data from the received second data frame, inserts the response data into the end of the received second data frame, The data transmission system of the present invention provides an on-the-fly data transmission system.

In the on-the-fly data transmission system according to the present invention, when the first data frame is received after a predetermined time in the first mode, the master device can not extract the first data frame from the plurality of slave devices If a datagram remains, it can be determined that an error has occurred.

In addition, the master device may receive and process a second data frame including response data inserted by a plurality of slave devices after a predetermined time in the second mode.

Here, the header of the first data frame and the header of the second data frame may include identification information for distinguishing the first data frame and the second data frame, respectively.

In addition, a master device according to the present invention includes: a communication interface for transmitting and receiving a data frame; And generating and transmitting a first data frame including a plurality of datagrams corresponding to a plurality of slave devices in the first mode and transmitting only the header in the second mode, And a second data frame to be transmitted is generated and transmitted.

In addition, a slave device according to the present invention includes: a first communication interface unit for receiving a data frame; A second communication interface for transmitting a data frame; And receiving a first data frame in the first mode and extracting a datagram located at a front end based on a header of the first data frame and transmitting the datagram, 2 mode, the control unit may receive the second data frame, insert the response data at the end of the received second data frame, and transmit the response data.

Further, the present invention is characterized in that, as another solution to the above-mentioned problems, a master device and a plurality of slave devices are connected in series in a ring form, and a data frame transmitted from the master device sequentially passes through the plurality of slave devices, Wherein the master device transmits a first data frame including a plurality of datagrams corresponding to a header and a plurality of slave devices to an adjacent device, 1 < / RTI > data frame; And a second mode performing step of the master device transmitting a second data frame including a header to an adjacent device and receiving a second data frame including response data inserted by a plurality of slave devices after a predetermined time Wherein the first mode performing step and the second mode performing step are alternately performed.

Further, the present invention is characterized in that, as another solution to the above-mentioned problems, a master device and a plurality of slave devices are connected in series in a ring form, and a data frame transmitted from the master device sequentially passes through the plurality of slave devices, Wherein the slave device extracts a datagram located at a front end based on a header of the received first data frame when a first data frame is received from an adjacent device, Transmitting a first data frame including the first data frame to an adjacent device; And a second mode performing step of, when the slave device receives a second data frame from an adjacent device, inserting response data at the end of the received second data frame and transmitting the response data to an adjacent device, And the mode-performing step and the second mode-performing step are performed alternately.

The present invention relates to an on-the-fly method in which a master device and a plurality of slave devices are connected in series and a data frame including a plurality of datagrams corresponding to a plurality of slave devices is sequentially transmitted to the master device and a plurality of slave devices In the transmission system, the data transmission from the master device to the slave device and the data transfer from the slave device to the master device are alternately performed by distinguishing the read period and the write period from each other in the slave device, The data can be transmitted more efficiently.

In particular, since the read and write cycles are alternately generated, a time difference occurs between the read and write operations in the slave device, so that the slave device can execute the control command received in the read cycle and transmit the execution result through the write cycle .

In addition, according to the present invention, when a master device transmits a first data frame including a plurality of datagrams to be transmitted to a plurality of slave devices in a read cycle, The slave device extracts a datagram located at the front end of the first received data frame and transmits the extracted datagram to an adjacent device. When the master device transmits a second data frame including only the header in the write period, It is possible to simplify the processing in the slave device and reduce the processing delay by inserting the datagram to be transmitted to the master device at the end of one second data frame and delivering it.

Further, the present invention can optimize the data transfer rate by keeping the data frame size between the master device and the slave device to a minimum.

1 is a block diagram illustrating a data transmission system according to an embodiment of the present invention.
2 is a block diagram showing a configuration of a master device according to the present invention.
3 is a block diagram showing a configuration of a slave device according to the present invention.
4 is a flowchart illustrating a data transfer process of the master device according to the present invention.
5 is a flowchart illustrating a data transmission process of the slave device according to the present invention.
6 and 7 are diagrams illustrating data frames transmitted in a data transmission system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings and the inventor is not limited to the concept of terminology for describing his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

Also, terms including ordinal numbers such as first, second, etc. are used to describe various elements, and are used only for the purpose of distinguishing one element from another, Not used. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

In addition, when referring to an element as being "connected" or "connected" to another element, it means that it can be connected or connected logically or physically. In other words, it is to be understood that although an element may be directly connected or connected to another element, there may be other elements in between, or indirectly connected or connected.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprising "or" having ", as used herein, are intended to specify the presence of stated features, integers, It should be understood that the foregoing does not preclude the presence or addition of other features, numbers, steps, operations, elements, parts, or combinations thereof.

The present invention relates to an on-the-fly data transmission method in which one master device and a plurality of slave devices are connected in series and a data frame including a plurality of datagrams corresponding to a plurality of slave devices sequentially passes through the plurality of slave devices System. At this time, the network structure in which the master device and the plurality of slave devices are connected may have various shapes. For example, the one master device and the plurality of slave devices are connected in a ring structure. In this case, one master device and a plurality of slave devices may be connected by a bidirectional bus or a unidirectional bus, As shown in FIG.

1 is a diagram illustrating an example of a data transmission system according to the present invention.

The data transmission system according to the first embodiment of the present invention may have a ring structure in which a master device 100 and a plurality of slave devices 200 are connected in series via a unidirectional bus.

Here, the master device 100 is an object that performs data transfer in a data transfer system, and a plurality of slave devices 200 are objects that passively perform data transfer under the control of the master device 100 .

Specifically, the master device 100 generates a data frame including a plurality of datagrams corresponding to a plurality of slave devices 200 at regular intervals, and transmits the generated data frames to the adjacent slave device 200a in the first direction.

The data frame is transmitted to the second port of the master device 100 through the first slave device 200a, the second slave device 200b, ..., the Nth slave device 200n in order, .

Accordingly, the master device 100 transmits a data frame including a plurality of datagrams to be transmitted to the plurality of slave devices 200 at regular intervals, and receives the data frame from the adjacent Nth slave device 200n after a predetermined time .

At this time, the plurality of slave devices 200 receive the data frame from a device (a master device or a slave device) adjacent in a second direction, and perform reading and writing of the received data frame, / The master device 100, and then transmits the data frame to the adjacent device (master device or slave device) in the first direction.

The data frame transmitted to the master device 100 through the plurality of slave devices 200 may be transmitted to the slave devices 200 in place of the plurality of datagrams that the master device 100 desires to transmit to the plurality of slave devices 200 A plurality of slave devices 200 include a plurality of datagrams to be transmitted to the master device 100.

The data transmission method as described above is referred to as an on-the-fly method.

The present invention is directed to optimizing the data transfer rate in such an on-the-fly data transmission system. The slave device 200 transmits data to the slave device 200 via the master device 100 The data transfer is performed by dividing a write cycle for transferring data. In the following description, the operation mode in the read period is referred to as a first mode, and the operation mode in the write period is referred to as a second mode.

The master device 100 transmits a first data frame including a plurality of datagrams corresponding to a plurality of slave devices 200 in the first mode by alternately performing a first mode and a second mode , And transmits a second data frame including only the header in the second mode.

In addition, the plurality of slave devices 200 may alternately perform the first mode and the second mode. In the first mode, the first data frame is received and the first data frame is transmitted to the slave device 200 Extract the datagram that is located and deliver it. By extracting the datagram, the space of the corresponding datagram becomes empty, and then the plurality of slave devices 200 shifts the remaining datagram of the data frame in the header direction and transmits it to the adjacent device in the second direction do. According to this, when receiving a data frame, the datagram located second from the header exists at the first position from the header when data is transmitted.

In addition, when the second data frame is received in the second mode, the plurality of slave devices 200 insert the response data at the end of the received second data frame, and then transmit the response data.

According to the above description, the plurality of slave devices 200 according to the present invention perform data reading and data writing alternately instead of simultaneously reading and writing data in one cycle, thereby further reducing the processing delay , And after receiving the control command from the master device 100, the processing result for the control command can be transmitted in the next cycle. In particular, since a plurality of slave devices 200 according to the present invention merely need to extract a datagram located at the end of a data frame unconditionally received, without analyzing a header for identifying the location of the datagram allocated to the slave device 200, The processing can be simplified and the processing time can be shortened. This effect may have a greater effect on the on-the-fly data transmission in which the processing delay in the slave device 200 is larger than the transmission delay.

The on-the-fly data transmission system according to the present invention configured as described above can be applied to various industrial fields such as power management / control, factory automation, robot control, and the like.

In the above-described on-the-fly data transmission system, the configuration and operation of the master device 100 and the slave device 200 that perform the function for optimizing the data rate according to the present invention will be described in more detail.

2 is a block diagram showing a configuration of a master device 100 according to the present invention.

The master device 100 may include a control unit 110, a communication interface unit 120, and a storage unit 130. Referring to FIG. Here, the control unit 110 generates a first data frame including control information and a second data frame for receiving response information from the plurality of slave devices 200 to control the plurality of slave devices 200, And transmission / reception processing. The control unit 110 includes a periodic control module 111, a data generation module 112, and a data verification module 113.

The periodic control module 111 is a unit for controlling the data transmission period and particularly includes a reading period for transmitting data from the master device 100 to the slave device 200 and a reading period for transmitting data from the slave device 200 to the master device 100. [ So that a write cycle for transferring data is alternately performed. Specifically, the periodic control module 111 operates in a first mode during a read period to transmit a first data frame including a plurality of datagrams to be transmitted to a plurality of slave devices 200, The first data frame transmitted via the slave device 200 of FIG.

In addition, the periodic control module 111 also operates in the second mode during the write period to transmit a second data frame for receiving response information from the plurality of slave devices 200, And receives the second data frame transmitted via the slave device 200. [

The data generation module 112 is configured to generate a data frame to be transmitted to a plurality of slave devices 200 located on the path of a ring structure, and in accordance with the control of the period control module 111, A plurality of datagrams are sequentially arranged after the header according to the arrangement order of the plurality of slave devices 200 corresponding to the plurality of slave devices 200, And generates the second data frame consisting of only the header to receive the response information from the slave slave device 200 in the second mode.

The data confirmation module 113 is a structure for processing a received data frame after passing through a plurality of slave devices 200. [ Specifically, the data checking module 113 analyzes the first data frame received in the first mode, checks the number of datagrams existing in the first data frame, and determines whether an error has occurred based on the number of datagrams do. That is, if no failure occurs in any of the plurality of slave devices 200, all the datagrams included in the first data frame are extracted by the plurality of slave devices 200, and only the header is left. Therefore, when the received first data frame includes only the header, it is determined that the data transmission is normally performed. If one or more datagrams exist in the received first data frame, It is determined that a transmission error has occurred.

In addition, the data checking module 113 extracts a plurality of datagrams inserted in the received second data frame in the second mode, analyzes the plurality of datagrams, and transmits the response of the plurality of slave devices 200 Information (for example, whether or not the control command is normally processed).

The communication interface unit 120 is a unit for transmitting and receiving data and transmits the first and second data frames generated by the control unit 110 to the adjacent slave devices 200a, 1 and 2 data frames to the controller 110.

The storage unit 130 is a structure for storing information and programs necessary for the operation of the master device 100, and may store control information to be transmitted and received response information. The storage unit 130 may be an optical recording medium such as a magnetic medium such as a hard disk, a floppy disk, and a magnetic tape, a compact disk read only memory (CD-ROM), and a digital video disk (DVD) A magneto-optical medium such as a floppy disk and a ROM, a random access memory (RAM), and a flash memory.

3 is a block diagram illustrating a configuration of a slave device 200 according to the present invention. The slave device 200 according to the present invention basically includes first and second communication interface units 210 and 220, A control unit 230, and a storage unit 240.

The first communication interface unit 210 is configured to transmit a data frame. The second communication interface unit 220 has a configuration for receiving a data frame. The port is a physical connection unit. And the like, which are connected via a bus to an adjacent device and a bus.

For example, the first communication interface 210 of the slave device 200, which is applied to the data transmission system according to the first embodiment of the present invention, may be connected to a device (master device or slave device) And the second communication interface 220 is connected to another device (master device or slave device) adjacent in the second direction via a bus and is connected to the second direction And transmits the data frame to another adjacent device.

The control unit 230 is configured to perform reading and writing of the received data frame. Specifically, the control unit 230 alternately performs the first mode and the second mode in accordance with the read / write and write cycles. In the first mode, the first data frame received from the first communication interface unit 210, And performs a read operation. Then, the first data frame from which the datagram at the front end is extracted is transmitted to the adjacent device in the second direction through the second communication interface unit 220. For reference, at this time, after extracting the datagram located at the front end, the remaining datagram is shifted to the front end, that is, the header direction.

In addition, the controller 230 performs a write operation to insert a datagram to be transmitted to the master device 100 at the end of the second data frame received through the first communication interface 210 in the second mode . The second data frame inserted with the datagram is transmitted to the adjacent device in the second direction through the second communication interface unit 220.

The storage unit 240 stores data to be processed by the slave device 200. Specifically, the storage unit 240 stores a datagram extracted by the control unit 230 and a datagram to be inserted.

The operation of the master device 100 and the slave device 200 configured as described above will be described with reference to Figs.

4 is a flowchart illustrating a data transfer process of the master device 100 according to the present invention.

Referring to FIG. 5, the master device 100 determines whether it is the current write period or the read period through the periodic control module 111 (S105). The write period and the read period are alternately performed in a predetermined data transfer cycle.

As a result of checking, if the reading period is the master mode, the master device 100 operates in the first mode and performs steps S110 to S125.

First, the master device 100 generates a plurality of datagrams based on control information to be transmitted to a plurality of slave devices 200 through the data generation module 120, and transmits the plurality of datagrams sequentially To generate a first data frame (S110). The header of the first data frame includes identification information indicating a first data frame for transmission of control information.

Then, the generated first data frame is transmitted to the adjacent slave device 200a via the communication interface 120 (S115).

The first data frame is returned to the master device 100 through a plurality of slave devices 200. [

The master device 100 receives the first data frame returned from the adjacent slave device 200n through the communication interface 120 (S120).

At this time, when the first data frame transmitted from the master device 100 is normally transmitted / received to all the slave devices 200 and the datagram is extracted, there is no datagram in the first data frame .

Accordingly, the master device 100 checks whether there is a datagram in the first data frame received through the data checking module 113, and checks the transmission error (S125). At this time, if there is a datagram not extracted in the first data frame received by the master device 100, the master device 100 determines that a transmission error has occurred, Processing or retransmission processing can be performed. The failure processing may be performed by transmitting a message for confirming failure to each of the plurality of slave devices 200 and then checking a response to the failure message. Alternatively, a plurality of slave devices 200 corresponding to each datagram included in the first data frame After the identification information indicating the slave device 200 is included, the master device 100 checks the identification information of the datagram remaining in the received first data frame to identify the failed slave device 200 There is also water.

Also, the master device 100 can repeatedly transmit the same first data frame until the respective control commands are normally transmitted to the plurality of slave devices 200.

On the other hand, if it is determined in step S105 that the write cycle is the write cycle, the master device 100 switches to the second mode and performs steps S130 through S145.

That is, the master device 100 generates a second data frame composed of a header including identification information indicating a second data frame for a response through the data generation module 112, To the slave device 200a (S130). The second data frame is returned via a plurality of slave devices 200, and response information is inserted by the plurality of slave devices 200.

Then, the master device 100 receives a second data frame returned from the slave device 200n after a predetermined time (S135).

The master device 100 checks the transmission error of the second data frame through the data checking module 113. This can be done by checking the number of datagrams inserted in the second data frame. That is, when the second data frame is normally processed, the returned second data frame is inserted with as many datagrams as the number of slave devices 200. [ Therefore, the master device 100 checks whether or not a data error has occurred in the second data frame by inserting as many datagrams as the number of slave devices 200, and checks whether or not the data error has occurred. In addition, each datagram of the second data frame includes identification information that can distinguish the slave device 200, so that the master device 100 analyzes the datagram of the received second data frame, It is possible to confirm whether or not a response is received from the device 200. [

Then, the master device 100 analyzes the second data frame and extracts and processes the response information transmitted by the plurality of slave devices 200 (S145).

5 is a flowchart illustrating a data transmission method of the slave device 200 according to an embodiment of the present invention.

In the data transmission system according to the first embodiment of the present invention, the slave device 200 receives a data frame (first data frame) from a device adjacent in the first direction through the first communication interface 210, Or a second data frame) (S205).

When the data frame is received by the first communication interface unit 210, the controller 230 of the slave device 200 determines whether the current period is a read period or a write period (S210). This can be determined by checking the predetermined timing, but it can be determined based on the identification information included in the header of the received data frame.

That is, if the received data frame is the first data frame, it is determined that the received data frame is the read period. If the received data frame is the second data frame, have.

The slave device 200 operates in the first mode, and in the first mode, extracts a datagram located at the head based on the header in the received data frame (S215). At this time, the slave device 200 further verifies the identification information included in the datagram, and can confirm whether the extracted datagram is a datagram allocated to itself. If the extracted datagram is not a datagram allocated to the slave device 200, You can extract datagrams. Accordingly, even if the datagram can not be extracted from the previous slave device 200, the subsequent slave device 200 can securely extract the datagram allocated to the slave device 200 itself.

Then, the controller 230 shifts the remaining datagram of the data frame in the header direction (S220). Accordingly, the datagram which was located second from the header in the received data frame is located at the leading end.

In addition, the control unit 230 transmits the first data frame extracted from the datagram to the adjacent device in the second direction through the second communication interface unit 220.

In the data transmission system according to the first embodiment of the present invention configured as shown in FIG. 1, the slave device 200 transmits a datagram located at the front end of a data frame without analyzing the received data frame And obtain the datagram transmitted to the master device 100 by itself.

As a result of the determination in step S210, the slave device 200 operates in the second mode, and when the write cycle is completed, the slave device 200 operates at the end of the second data frame received by the first communication interface 210, 100) is inserted (S230). At this time, the slave device 200 may include identification information indicating itself in the datagram.

Then, the second data frame inserted with the datagram is transmitted to the adjacent apparatus through the second communication interface unit 220 (S225).

6 is a diagram illustrating a first data frame transmitted in the data transmission system according to an embodiment of the present invention, wherein (a) shows a first data frame transmitted from the master device 100 to the slave device 200a The datagrams D1 to DN allocated to the plurality of slave devices 200 on the basis of the header H are sequentially arranged.

The slave device 200a receiving the first data frame extracts the datagram D1 located at the front end of the first data frame, shifts the remaining datagram to the front end, and transmits the data to the next slave device 200b.

Therefore, as shown in FIG. 6B, the data frame transmitted to the slave device 200b immediately after the header H, that is, the datagram D2 is located at the leading end, and then D3, ..., ..., DN.

Accordingly, the slave device 200b also extracts the datagram D2 located at the front end of the received first data frame, shifts the remaining datagram to the front end, and transmits the data to the next slave device 200c.

This process is repeated so that only the datagram DN exists in the first data frame transmitted to the last slave device 200n on the basis of the header H as shown in FIG. 6 (c).

The last slave device 200b also extracts the datagram DN to be positioned at the end of the received data frame and then transmits the first data frame to the master device 100. [

Therefore, when all of the plurality of slave devices 200 operate normally, the master device 100 receives the first data frame including only the header H.

7 is a diagram illustrating a second data frame transmitted in a data transmission system according to an embodiment of the present invention.

The master device 100 transmits the second data frame including only the header H to the adjacent slave device 200a and the slave device 200a transmits the second data frame including the header H to the master device 100 at the end of the received second data frame Inserts the datagram R1 containing the response information to be transmitted, and transmits the datagram to the next slave device 200b.

7A shows a second data frame transmitted from the slave device 200a to the next slave device 200b and includes a datagram R1 inserted in the first slave device 200a on the basis of the header H, ).

After receiving the data frame, the slave device 200b transmits a datagram R2 containing response information to be transmitted to the master device 100 at the end of the second data frame, as shown in FIG. 7 (b) And transmits it to the next slave device 200c.

7 (c), the second data frame transmitted from the last slave device 200n to the master device 100 is transmitted from the slave device 200 to the master device 100. [ R2, R3,..., RN to be transmitted to the master device 100 by a plurality of slave devices 200 are inserted at the front end of the master device 100, that is, at the front end.

Accordingly, the master device 100 can receive the response information corresponding to the control command transmitted from the second data frame in the first data frame.

The master device 100 and the slave device 200 according to the present invention may be driven by instructions that cause one or more processors to perform the functions and processes described above. In one implementation, the processor may be a single-threaded processor, and in other embodiments, the processor may be a multithreaded processor. Further, the processor is capable of processing instructions stored on a memory or storage device. The instructions may also include interpreted instructions or executable code such as, for example, script commands, such as JavaScript or ECMAScript commands, or other instructions stored on a computer readable medium.

Although the present specification and drawings describe exemplary device configurations, the functional operations and subject matter implementations described herein may be embodied in other types of digital electronic circuitry, or alternatively, of the structures disclosed herein and their structural equivalents May be embodied in computer software, firmware, or hardware, including, or in combination with, one or more of the foregoing. Implementations of the subject matter described herein may be embodied in one or more computer program products, i. E. One for computer program instructions encoded on a program storage medium of the type for < RTI ID = 0.0 & And can be implemented as a module as described above. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter that affects the machine readable propagation type signal, or a combination of one or more of the foregoing.

The method according to the present invention can be implemented as a computer program (also known as a program, software, software application, script or code) and recorded on a computer readable recording medium. Here, a computer program may be written in any form of programming language including compiled or interpreted language, a priori or procedural language, and may be a stand alone program, module, component, subroutine, or other unit May be deployed in any form including. A computer program does not necessarily correspond to a file in the file system. The program may be stored in a single file provided to the requested program, or in multiple interactive files (e.g., a file storing one or more modules, subprograms, or portions of code) (E.g., one or more scripts stored in a markup language document). A computer program may be deployed to run on multiple computers or on one computer, located on a single site or distributed across multiple sites and interconnected by a communications network.

Computer-readable media suitable for storing computer program instructions and data include semiconductor memory devices such as, for example, EPROM, EEPROM, and flash memory devices, such as magnetic disks such as internal hard disks or external disks, And DVD-ROM disks, including non-volatile memory, media and memory devices. The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

Certain embodiments of the subject matter described herein have been described. Other embodiments are within the scope of the following claims. For example, the operations recited in the claims may be performed in a different order and still achieve desirable results. By way of example, the process illustrated in the accompanying drawings does not necessarily require that particular illustrated or sequential order to obtain the desired results. In certain implementations, multitasking and parallel processing may be advantageous.

The description sets forth the best mode of the invention, and is provided to illustrate the invention and to enable those skilled in the art to make and use the invention. The written description is not intended to limit the invention to the specific terminology presented. Thus, while the present invention has been described in detail with reference to the above examples, those skilled in the art will be able to make adaptations, modifications, and variations on these examples without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited by the described embodiments but should be defined by the claims.

The present invention relates to an on-the-fly method in which a master device and a plurality of slave devices are connected in series and a data frame including a plurality of datagrams corresponding to a plurality of slave devices is sequentially transmitted to the master device and a plurality of slave devices In the transmission system, the data transmission from the master device to the slave device and the data transfer from the slave device to the master device are alternately performed by distinguishing the read period and the write period from each other in the slave device, The data can be transmitted more efficiently.

In particular, since the read and write cycles are alternately generated, a time difference occurs between the read and write operations in the slave device, so that the slave device can execute the control command received in the read cycle and transmit the execution result through the write cycle .

In addition, according to the present invention, when a master device transmits a first data frame including a plurality of datagrams to be transmitted to a plurality of slave devices in a read cycle, The slave device extracts a datagram located at the front end of the first received data frame and transmits the extracted datagram to an adjacent device. When the master device transmits a second data frame including only the header in the write period, It is possible to simplify the processing in the slave device and reduce the processing delay by inserting the datagram to be transmitted to the master device at the end of one second data frame and delivering it.

Further, the present invention can optimize the data transfer rate by keeping the data frame size between the master device and the slave device to a minimum.

100: master device 110:
120: communication interface unit 130:
200, 200a to 200n: slave device 210: first communication interface unit
220: second communication interface unit 230:
240:

Claims (11)

A master device connected in a ring form for transmitting data in an on-the-fly manner, and a plurality of slave devices,
Wherein the master device transmits a first data frame including a plurality of datagrams corresponding to a plurality of slave devices in the first mode in an alternating manner in a first mode and a second mode, A second data frame including only the first data frame,
The plurality of slave devices alternately perform a first mode and a second mode, wherein the first mode receives the first data frame and extracts a datagram located at a front end based on the header of the first data frame And the second mode receives the second data frame, inserts the response data into the end of the second data frame, and transmits the response data. 2. The apparatus of claim 1, wherein the master device
Wherein when the first data frame is received after a predetermined time in the first mode and a datagram that can not be extracted from a plurality of slave devices remains in the first data frame, Method data transmission system. 2. The apparatus of claim 1, wherein the master device
Wherein the second mode receives and processes a second data frame including response data inserted by a plurality of slave devices after a predetermined time in the second mode. The method according to claim 1,
Wherein the header of the first data frame and the header of the second data frame each include identification information for distinguishing the first data frame from the second data frame. A communication interface for transmitting and receiving a data frame; And
Alternately performing the first mode and the second mode,
A first data frame including a plurality of datagrams corresponding to a plurality of slave devices is generated and transmitted in a first mode, and when the first data frame is received after a predetermined time, If the datagram is not extracted from the slave device, it is determined that an error has occurred,
A control unit for generating and transmitting a second data frame including only a header in the second mode and controlling the receiving and processing of the second data frame including response data inserted by a plurality of slave devices after a predetermined time And a master device. delete delete A first communication interface for receiving a data frame;
A second communication interface for transmitting a data frame; And
Wherein the first mode and the second mode are alternately performed. In the first mode, a first data frame is received, a datagram located at a front end of the first data frame is extracted based on a header of the first data frame, Mode includes receiving a second data frame, inserting response data at the end of the received second data frame, and transmitting the response data. 1. An on-the-fly data transmission method in which a master device and a plurality of slave devices are connected in series in a ring form, and a data frame transmitted from the master device sequentially passes through the plurality of slave devices and returns to the master device,
Wherein the master device transmits a first data frame including a header and a plurality of datagrams corresponding to a plurality of slave devices to an adjacent device and confirms whether the first data frame returned after a predetermined time is received A mode performing step; And
And a second mode performing step of the master device transmitting a second data frame including a header to an adjacent device and receiving a second data frame including response data inserted by a plurality of slave devices after a predetermined time However,
Wherein the first mode performing step and the second mode performing step are performed alternately. 10. The method of claim 9, wherein in the first mode performing step,
Wherein the master device checks a datagram remaining in the received first data frame and determines that the datagram is an error if the datagram is left. 1. An on-the-fly data transmission method in which a master device and a plurality of slave devices are connected in series in a ring form, and a data frame transmitted from the master device sequentially passes through the plurality of slave devices and returns to the master device,
When receiving a first data frame from an adjacent device, extracts a datagram located at a front end of the received first data frame based on the header of the received first data frame and transmits the first data frame including the remaining datagram to an adjacent device A first mode performing step of transmitting the first mode; And
And a second mode performing step of, when the slave device receives a second data frame from an adjacent device, inserting response data at the end of the received second data frame and transmitting the response data to an adjacent device,
Wherein the first mode performing step and the second mode performing step are performed alternately.

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