KR101623063B1 - Method for transmitting of control frame using detour link, node apparatus and system for the same - Google Patents

Abstract

The present invention relates to a control frame transmission method using a bypass path, and more particularly, to a control frame transmission method using a bypass path in which a first port connected to a neighboring node on a data transmission path of each node constituting an industrial network, And a second port connected to another node to which the second port is connected. In the case where a failure occurs in transmitting a control frame to the neighboring node through the first port, control using a detour path capable of transmitting a control frame to another node using the second port A frame transmission method, a node and a control frame transmission system therefor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control frame transmission method using a bypass path, a node control frame transmission method,

The present invention relates to a control frame transmission method using a bypass path, and more particularly, to a control frame transmission method using a bypass path, more specifically, by providing a communication line separate from a main communication line when connecting each node constituting an industrial network, A control frame transmission method using the bypass path, and a node and a control frame transmission system therefor.

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

The industrial network system used in the automobile industry or the robot industry has been continuously developed to meet various requirements required in the industrial field. Various industrial networks such as CC-Link, CAN-based DeviceNet and CAN Open, and SERCOS, which is a communication interface for motion control applications, developed and developed by G Company in the 1970s led to the development of production automation network, Has evolved.

And recently, as the production technology rapidly develops, the requirements of the industrial network to obtain more efficient and reliable results are continuously increasing. In addition, since the actuator level and the sensor level in a factory automation system using an industrial network are gradually replaced with a digital signal transmission type, there is an increasing need for integration into an intelligent smart actuator using various microprocessors.

In line with this trend, the application of communication protocol systems based on Ethernet is emerging as the mainstream for industrial communication networks used in factory facilities, process control facilities, building automation and infrastructure.

Especially, the industrial Ethernet technology which is born by the necessity of the automation field, ie, Ethernet technology, is spreading to all industrial fields such as process automation, power IT, and motion. In addition, standardization work of Ethernet / IP, Profinet, Ethercat, etc. is going on in the IEC to prevail in industrial Ethernet market outside the country. Since the Ethernet communication is superior in performance, the cost of constructing the system is lower than that of the existing industrial Ethernet communication system, and the accessibility of the user is excellent, it is emerging as a typical communication method of the industrial Ethernet in the future and it is necessary to construct the industrial Ethernet communication system Hardware is being developed.

For example, the master node generates a control frame for transmission to each slave node connected to the data transmission path and transmits the control frame to the slave node. At this time, the generated control frame is transmitted to the slave node A plurality of datagrams in which control information corresponding to each of the plurality of datagrams is recorded, and then transmitting the datagrams to the slave node.

However, in this case, the master node and the slave node form a communication line between adjacent nodes, so that when a problem occurs in a connected adjacent node or a specific communication line, transmission / reception of information becomes impossible after the corresponding node. In addition, even if a problem occurs in a specific node or a specific communication line, it takes a considerable time to recognize it at the master node, and it takes a long time to recover the node or the communication line in which the failure occurs.

In general, industrial Ethernet communication systems are applied to industrial automation, robot systems, and the like. High speed and safety are important. As described above, conventional industrial Ethernet communication systems can not detect an obstacle immediately, There is a problem that can not be done.

Korean Patent Publication No. 2014-0021305, published on February 20, 2014 (name: communication network system)

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-described problems of the prior art, and it is an object of the present invention to provide a bypass communication method, A control frame transmission method using the same, and a node and a control frame transmission system for the same.

In particular, the present invention provides a data transmission system including a first port connected to a neighboring node on a data transmission path and a second port connected to at least another node between the adjacent nodes, A control frame transmission method using a bypass path that can transmit a control frame to another node using a second port when a failure occurs in transmission, and a node and a control frame transmission system therefor.

However, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

According to another aspect of the present invention, there is provided a control frame transmission system for generating control frames including control information for controlling operations of respective slave nodes located in a data transmission path, A master node for transferring a frame to a neighboring slave node connected to a downstream end of the data transmission path; And receiving the control frame from the master node or a neighboring slave node located at a preceding stage of the data transmission path to check control information for operation control corresponding to the control frame in the control frame, Wherein the master node and the slave node each include a first port for supporting connection between adjacent nodes and a second port for supporting connection between adjacent nodes, And a second port for supporting connection with a node, and when a failure occurs in a specific line connected to the adjacent node or the neighboring node during the transmission of the control frame using the first port, And transmit the control frame.

According to an aspect of the present invention, there is provided a master node comprising: a master communication unit for transmitting a control frame that can be sequentially transmitted to a plurality of slave nodes located in a data transmission path; And control information for controlling the operation of each slave node located in the data transmission path, and transmits the generated control frame to the adjacent slave node connected to the rear end of the data transmission path through the master communication unit Wherein the master communication unit includes a second port for supporting a connection between the first slave node and a first port for supporting connection with the adjacent slave node, Wherein when the control frame is transmitted to the adjacent slave node using the first port, the master control unit transmits the control frame to the adjacent slave node or the adjacent slave node via the second port, The second control frame is transmitted to the slave node There can reach.

At this time, the master control unit senses the voltage of the communication line, determines that a failure has occurred in the communication line when the sensed voltage is less than a preset value, The control frame including the response information or the response information is not received from the neighboring slave node or the response frame corresponding to the neighboring slave node is included in the control frame transmitted through all the slave nodes located in the data transmission path It can be determined that the neighboring slave node has failed.

The master control unit further includes a master storage unit for storing port connection information for each of the slave nodes, wherein the master control unit controls the slave node connected to the first port and the slave node connected to the second port, It is possible to confirm the port connection information for each slave node previously stored in the master storage unit and to transmit the control frame to the corresponding slave node according to the confirmed port connection information.

According to an aspect of the present invention, a slave node receives a control frame transmitted from a master node or another slave node located at a preceding stage of a data transmission path, transfers the control frame to a data processing unit, A slave communication unit for transmitting a control frame to a neighboring node located downstream of the data transmission path under the control of the processing unit; A data processing unit for checking the control information of the corresponding datagram in the control frame when the control frame is transmitted through the communication unit; And an operation performing unit operable to perform an operation corresponding to the control information confirmed by the data processing unit, wherein the slave communication unit includes a first port for supporting connection between adjacent nodes, and at least another node And a second port for supporting a connection with the neighboring node or the neighboring node when the control frame is transmitted using the first port, Port to transmit the control frame.

At this time, the data processor senses a voltage of a communication line connected through the first port, determines that a fault has occurred in the communication line when the sensed voltage is less than a predetermined value, or transmits the control frame to the adjacent node When the response information is not received from the neighboring node within the set time, it can be determined that the failure has occurred in the neighboring node.

In addition, the data processing unit may report a failure occurrence to the master node when it is determined that a failure has occurred in both the neighbor node and the other node, and if information about another node connectable from the master node is received, And may transmit the control frame in a wireless communication manner to the node.

According to another aspect of the present invention, there is provided a control frame transmission system including a master node and a plurality of slave nodes, Transmitting a control frame to a neighboring node connected thereto through a link; Detecting any one of the nodes having a fault in the communication line connected between the adjacent node or the adjacent node; And transmitting the control frame to another node connected to the neighboring node via the second port when the node detects that one of the nodes has failed.

The sensing may include detecting a voltage of the communication line, determining that a failure has occurred in the communication line when the sensed voltage is less than a preset value, If the control frame including the response information or the response information is not received from the neighbor node or if the node is the master node, the control frame transmitted through all the slave nodes located in the data transmission path If the response information corresponding to the slave node is not included, it can be determined that a failure has occurred in the neighboring node.

If it is determined that a failure has occurred in both the neighboring node and the other node after the step of transmitting the control frame to the other node, port connection information for each slave node previously stored in the master node is checked, And can transmit the control frame to the corresponding slave node according to the connection information in a wireless communication manner.

Furthermore, the present invention can provide a computer readable recording medium on which a program for executing a control frame transmission method using a bypass path according to the above-described embodiment is recorded.

According to the control frame transmission method using the bypass path of the present invention, the node and the control frame transmission system for the same, a first port connected to the adjacent node on the data transmission path and a second port connected to at least another node between the adjacent node When a failure occurs in transmission of a control frame to a neighboring node via the first port, a control frame is transmitted to another node using the second port, so that a failure occurs in a specific node or a specific communication line The control frame can be normally transmitted using the bypass path and the failure can be detected and repaired instantly, thereby enabling more stable data transmission.

In addition, various effects other than the above-described effects can be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is an exemplary diagram illustrating a control frame transmission system according to an embodiment of the present invention.
2 is a block diagram illustrating a main configuration of a master node according to an embodiment of the present invention.
3 is an exemplary diagram illustrating a structure of a control frame according to an embodiment of the present invention.
4 is a block diagram illustrating a main configuration of a slave node according to an embodiment of the present invention.
5 is a flowchart schematically illustrating a control frame transmission method using a detour path according to an embodiment of the present invention.
6 is a flowchart illustrating a control frame transmission method using a bypass path according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention. This is to omit the unnecessary description so as to convey the key of the present invention more clearly without fading. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, it should be understood that the invention is not limited to the specific embodiments thereof, It is to be understood that the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

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.

Now, a control frame transmission method using a bypass path according to an embodiment of the present invention, a node and a control frame transmission system therefor will be described in detail with reference to the drawings. Here, the same reference numerals are used for similar functions and functions throughout the drawings, and a duplicate description thereof will be omitted.

First, a control frame transmission system to which a control frame transmission method using a bypass path according to the present invention is applied will be described.

1 is an exemplary diagram illustrating a control frame transmission system according to an embodiment of the present invention.

1, a control frame transmission system 1000 according to an embodiment of the present invention includes a master node 100, a first slave node 200a, a second slave node 200b ), And a third slave node 200c, as shown in FIG. However, the present invention is not limited thereto, and a plurality of slave nodes 200 (collectively referred to as 200 when no separate distinction is required) may exist, and the master node 100 may also include a certain slave node 200 And a master node for controlling the service master node.

The node of the present invention includes both the master node 100 and the plurality of slave nodes 200 and is configured to distinguish between the master node 100 and the plurality of slave nodes 200, Otherwise, the node may be either the master node 100 or the slave node.

1A, the master node 100 refers to a control system that can control a plurality of slave nodes 200, and may include a central processing unit, a memory, an NIC, an OS, and a stack. have. The master node 100 according to the embodiment of the present invention configures different datagrams for each of a plurality of slave nodes 200 connected on an on-fly basis, and matches each slave node 200 A datagram can be transmitted in a control message for controlling the slave node 200. Here, the control message can be generated in the form of a control frame.

A plurality of slave nodes 200 operate in connection with the master node 100, which may include a large number of nodes installed in an industrial field, for example, a power supply facility, a driving apparatus, and a manufacturing facility. In particular, the slave node 200 according to the embodiment of the present invention takes the control information corresponding to itself in the control frame to be transmitted, records the response information in the area in which the corresponding control information is recorded, To the master node 100 or to another slave node. In another embodiment, when a control frame is received, the response information may be directly transmitted to the master node 100 without being recorded in the control frame.

As shown in FIG. 1A, the master node 100 and the plurality of slave nodes 200 may be sequentially connected through a communication cable, as shown in FIG. 1A.

The master node 100 and the plurality of slave nodes 200 may be physically connected through a communication cable, for example, an RJ45 port. The master node 100 first generates a control frame in which corresponding control information for each slave node 200 for transfer to each slave node 200 is recorded and transmits the generated control frame to the slave node 200 through the first port A To the first slave node 200a. The first slave node 200a receives the control frame, checks the datagram in which the control information corresponding to the control frame is stored in the control frame, performs the process specified by the control information, and transmits the response information to the first slave node 200a 1 to the master node 100 via the first port A and to the second slave node 200b located at the rear end of the data transmission path connected to the first port A. [ Similarly to the first slave node 200a, the second slave node 200b takes control information corresponding to itself in the transferred control frame and transmits the response information to the master node 100a via the first slave node 200a ). At the same time, the second slave node 200b transmits the transferred control frame to the third slave node 200c, and the third slave node 200c transmits the response information to the second slave node 200b and the first slave node 200c. To the master node 100 via the node 200a.

In particular, each node constituting the control frame transmission system 1000 according to the embodiment of the present invention includes a first port A for supporting connection between adjacent nodes, and a second port A And a second port (B) for supporting connection. At this time, when transferring the control frame to the first slave node 200a connected through the first port A, the master node 100 transmits the control frame to the first slave node 200a or the first slave node 200a, And may transmit a control frame to the second slave node 200b connected through the second port B if it is determined that a failure has occurred.

The master node 100 and the slave node 200 of the present invention may be connected in a topology form of a two-way communication scheme as shown in FIG. 1A, but as shown in FIG. 1B, a topology form of a unidirectional ring communication scheme . At this time, the master node 100 may transmit a control frame including a datagram (control data) to a plurality of slave nodes 200 located on a data transmission path. Here, the control frame is generated in the master node 100, transmitted to the plurality of slave nodes 200, passed through all the slave nodes 200 sequentially connected to the master node 100, You can come back. At this time, the control frame returned to the master node 100 includes response information for confirming whether the slave node is normally operated.

When the control frame sequentially returned to the plurality of slave nodes 200 located on the route of the ring structure is returned, the master node 100 checks the response information included in the control frame in each slave node 200, And the state of each slave node 200 can be confirmed.

In this control frame transmission system, in particular, each node according to an embodiment of the present invention includes a first port (A) for supporting a connection between adjacent nodes, and a second port And a second port (B) for supporting connection with the node. At this time, when transferring the control frame to the first slave node 200a connected through the first port A, the master node 100 transmits the control frame to the first slave node 200a or the first slave node 200a, And may transmit a control frame to the second slave node 200b connected through the second port B if it is determined that a failure has occurred.

Hereinafter, the main configuration and operation method of the master node 100 according to the embodiment of the present invention will be described.

2 is a block diagram illustrating a main configuration of a master node according to an embodiment of the present invention.

1 and 2, a master node 100 according to an embodiment of the present invention may include a master communication unit 110, a master control unit 120, and a master storage unit 130.

More specifically, the master communication unit 110 transmits the control frame generated by the master control unit 120 to the slave node 200. In particular, the master communication unit 110 according to the embodiment of the present invention includes a first port 110a for supporting connection between neighboring nodes, and a second port 110a for supporting connection between at least another node located between the adjacent nodes 110b. For example, the first port 110a may be connected to the first slave node 200a and the second port 110b may be connected to the first slave node 200a connected through the first port 110a, The second slave node 200b, which is another slave node between the first slave node 200a and the second slave node 200b. Here, the second port 110b may be connected to any other slave node between the first slave node 200a connected through the first port 110a. That is, it may be connected to the third slave node 200c, which may vary depending on the system implementation.

In addition, in the embodiment of the present invention, when the control frame transmission system is implemented in the form of a line supporting the bidirectional communication method, the first port 110a and the second port 110b can perform all the roles of the input and output ports . On the other hand, as shown in FIG. 1B, when implemented as a ring of a unidirectional communication scheme, the first port 110a and the second port 110b are both physically separated, such as an input port and an output port, Can be included. At this time, the output port of the first port 110a of the master node 100 may be connected to the input port of the next node, for example, the first port 110a of the first slave node 100a.

The master communication unit 110 according to the embodiment of the present invention transfers the control frame generated by the master control unit 120 to the first slave node 200a connected through the first port 110a, It is possible to receive the control frame including the response information or the response information from the control unit 200a. Also, a control frame is received through the first port 110a to the first slave node 200a, and a control frame including response information of all the slave nodes located on the data transmission path is transmitted to the first slave node 200a as the last slave node From the third slave node 200c. When the master slave node 200a is connected to the master slave node 200a via the first port 110a under the control of the master control unit 120, 2 slave node 200b to transmit the control frame again.

The master communication unit 110 according to an embodiment of the present invention may further include a wireless communication module (not shown), and may be connected to all the nodes connected through the first port 110a and the second port 110b If it is determined that a failure has occurred, the master control unit 120 may transmit a control frame to a slave node designated by a wireless communication scheme.

 The master control unit 120 performs overall control of the master node 100 and includes at least one processor including a CPU (Central Processing Unit) / MPU (Micro Processing Unit) and at least one memory loading data (For example, a register and / or a RAM (Random Access Memory)) to be loaded and a bus (BUS) for inputting / outputting at least one or more data to / from the processor and the memory. A predetermined program routine (Routine) loaded from the predetermined recording medium to the execution memory and operated on by the processor to perform a function defined in the master node 100 (for example, control frame generation) And may include program data.

In particular, the master control unit 120 according to the embodiment of the present invention generates a datagram in the control data in the control frame to control the plurality of slave nodes 200, and transmits the control frame to the plurality of slave nodes 200 sequentially Lt; / RTI > To this end, the master control unit 120 may include a frame generation module 120a and an anomaly detection module 120b.

First, the frame generation module 120a constructs a datagram corresponding to each slave node 200 located on a data transmission path, creates control information in the datagram, Frame.

The structure of the control frame generated by the frame generation module 120a will be briefly described with reference to FIG.

3 is an exemplary diagram illustrating a structure of a control frame according to an embodiment of the present invention.

As shown in FIG. 3, the control frame of the present invention may be composed of a header area, a data area, a tail area including an error check (CRC) and an interframe gap area. Here, the header area may have a size of 8 bytes, the error check area may have a size of 4 bytes, and the Interframe gap area may have a size of 12 bytes. However, the present invention is not limited to this, and various sizes may be used as needed.

The header area includes basic information related to a control frame to be transmitted to a plurality of slave nodes 200. The data area means an area in which corresponding control information is recorded for each slave node 200. The data area is composed of a plurality of datagrams. The datagram includes control information corresponding to each slave node 200, and one datagram may correspond to one slave node 200. [

The frame generation module 120a according to the embodiment of the present invention generates a control frame having the above-described structure, transfers the generated control frame to the master communication unit 110, Node, for example, the first slave node 200a.

On the other hand, the anomaly detection module 120b detects whether a specific node or a specific communication line has failed, and controls the control frame to be transmitted through the bypass path.

In other words, the abnormality detection module 120b checks the voltage of the communication line between the first slave node 220a connected through the first port 110a of the master communication unit 110, , It can be determined that a failure has occurred in the communication line.

The anomaly detection module 120b transmits the control frame to the first slave node 220a connected through the first port 110a and then receives the control frame including the response information or the response information within a predetermined time The first slave node 220b may determine that a failure has occurred. If it is detected that a failure has occurred, the anomaly detection module 120b may retransmit the control frame to the second slave node 220b connected through the second port 110b.

1B, when the error detection module 120b is implemented as a ring system, response information corresponding to a specific slave node is transmitted to the control frame transmitted through all the slave nodes located in the data transmission path If the control frame is not included in the control frame, it is determined that the specific slave node has failed and the control frame is not transmitted to the specific slave node during the transmission of the control frame in the next period. Can be configured and delivered.

In addition, the anomaly detection module 120b of the present invention may notify the manager of an abnormality in a specific line or a specific node.

If it is determined that the node connected through the first port 110a and the node connected through the second port 110b have failed, the anomaly detection module 120b of the present invention can detect the failure of the wireless communication module 110 of the master communication unit 110, To transmit the control frame in a wireless communication manner. At this time, the port connection information for each slave node located in the data transmission path may be checked, and the control frame may be transmitted to the corresponding slave node in accordance with the confirmed port connection information. For example, the master node 100 is connected to the second slave node 200b via the first port, and the third slave node 200a is connected to the third slave node 200c through the second port. The first slave node 200a connected through the first port 110a and the second slave node 200b connected to the second port 110b are connected to each other through the first port 110a, The first slave node 200a may transmit the control frame directly to the third slave node 200c connected to the first slave node 200a in a wireless communication manner.

At this time, the slave node including the wireless communication module among the slave nodes identified according to the port connection information can be identified, and the control frame can be transmitted prior to the slave node that has been confirmed. For example, in the case of a system configured with 100 slave nodes, the master node 100 may communicate with a first slave node 200a connected through a first port 110a thereof and a second slave node 200a connected via a second port 110b, When a failure occurs in all of the slave nodes 200b, the wireless communication module is operated to transmit the control frame to the next slave node, the port connection information for each slave node is checked, and a slave node closest to the slave node 200b A control frame can be transmitted to a slave node that can receive a control frame transmitted by itself.

In general, it is difficult to provide all the slave nodes constituting the industrial network with the wireless communication module. Therefore, when a failure occurs in all adjacent nodes, the control frame is transmitted to the slave node having the wireless communication module, And the node connected through the second port, the control frame can be transmitted stably by the wireless communication method.

The master storage unit 130 stores information necessary for the operation of the master node 100, and may store the generated control information, information on the control frame, port connection information for each slave node, and the like. The master storage unit 130 may be an optical storage 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 ), A magneto-optical medium such as a floppy disk and a ROM, a random access memory (RAM), and a flash memory.

Next, the specific configuration of the slave node 200 will be described in detail with reference to the accompanying drawings.

4 is a block diagram illustrating a main configuration of a slave node according to an embodiment of the present invention.

Referring to FIG. 4, a plurality of slave nodes 200 according to embodiments of the present invention may include a slave communication unit 210, a data processing unit 230, and an operation performing unit 220.

The slave communication unit 210 receives the control frame sequentially transmitted from the master node 100 and transmits the received control frame to the data processing unit 220. In addition, the data processing unit 220 performs a control operation according to the control information transmitted through the data processing unit 220, and then transmits a control frame including new data to which response information about the operation result, To the next slave node or master node 100 located on the data transmission path.

The slave communication unit 210 may include a first port 210a for supporting connection between adjacent nodes and a second port 210b for supporting connection between at least another node located between the adjacent nodes have.

When the control frame is received from the slave communication unit 210, the data processing unit 220 confirms the datagram corresponding to the datagram described in the data area of the control frame and confirms the control information described in the datagram .

The data processing unit 220 can transmit the confirmed control information to the operation performing unit 220. The operation executing unit 220 can output the result information obtained by performing the operation corresponding to the control information in the master node 100 New data including at least one of the requested response information and the current state information may be written in the datagram corresponding to the new data. In particular, when a control line is transmitted to a node connected through the first port 210a, the data processing unit 220 according to an embodiment of the present invention transmits a control frame to the second port 210b, To transmit the control frame. At this time, a neighboring node such as the master node 100 or another slave node may be connected through the first port 210a and another node may be connected through the second port 210b, for example, between the master node or the slave node Another slave node may be connected.

The data processing unit 230 reports a failure occurrence to the master node 100 when it is determined that a failure has occurred in the neighboring node or other nodes connected through the first port 210a, When information on another connectable node, that is, another slave node, is received, the control frame may be transmitted to the another slave node in a wireless communication manner.

The operation performing unit 220 may perform an operation according to the control information transmitted from the data processing unit 220 and may transmit the operation result to the data processing unit 220.

The main configuration and operation method of each node constituting the control frame transmission system according to the embodiment of the present invention has been described with reference to FIG. 2 to FIG.

However, each node of the present invention is not limited by the configuration shown in Figs. 2 to 4, and each node may be implemented by more components than the illustrated components. It should also be appreciated that the locations of the major components of each node illustrated in Figures 2 through 4 may be varied for convenience or for other reasons.

Further, a processor mounted on each node according to an embodiment of the present invention may process program instructions for executing the method according to the present invention. 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.

In addition, the term '~ module' used in the embodiment of the present invention means a software component, and '~ module' performs certain roles. By way of example, '~ module' may include components such as software components, object-oriented software components, class components and task components, and processes, functions, attributes, procedures, Routines, segments of program code, drivers, data, databases, data structures, tables, arrays, and variables. In addition, the functions provided in the components and 'modules' may be combined into a smaller number of components and '~ modules' or further separated into additional components and 'modules'.

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.

Hereinafter, a control frame transmission method using a bypass path according to an embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG.

5 is a flowchart schematically illustrating a control frame transmission method using a bypass path according to an exemplary embodiment of the present invention. Referring to FIG. 5, an operation procedure of a slave node among a plurality of slaves located on a data transmission path is described FIG.

Referring to FIG. 5, when a control frame is received from a node located at the preceding stage of the data transmission path connected through the first port, for example, the master node 100 or another slave node (S101) Check the corresponding datagram and check the control information described in the datagram. Then, an operation corresponding to the identified control information may be performed, and the response information may be transmitted to the master node 100, or may be written in the datagram corresponding to the control frame. Then, the one slave node transfers the control frame to the next slave node located at the rear end of the data transmission path connected through the second port. At this time, it is determined whether or not a failure has occurred in the next slave node (S103) , And transmits the control frame to another slave node having the next slave node connected thereto via the second port.

On the other hand, if it is determined in step S103 that the failure has not occurred, the control frame may be transmitted to the slave node sequentially connected through the first port (S107).

This will be described in more detail with reference to FIG.

6 is a flowchart illustrating a control frame transmission method using a bypass path according to an exemplary embodiment of the present invention.

6, the control frame transmission system of the present invention includes a master node 100 and a first slave node 200a, a second slave node 200b, a third slave node 200b, The master node 100 is connected to the first slave node 200a through the first port thereof and is connected to the second slave node 200b through the second port thereof, , The first slave node 200a is connected to the second slave node 200b through the first port thereof and is connected to the third slave node 200c through the second port thereof . However, the present invention is not limited to this, and a system including more slave nodes can be implemented. Also, the node connected through the second port of each node may be connected to any node if the node is connected to the node connected through the first port. Also, it is assumed that a failure occurs in the second slave node 200b.

First, the master node 100 generates a control frame (S301), and transmits the generated control frame to the first slave node 200a, which is a neighboring slave node connected through its first port (S303).

The first slave node 200a receives the control information of the corresponding datagram in the control frame (S305), performs an operation corresponding to the checked control information, and generates response information therefrom (S307).

Then, the first slave node 200a can directly transmit the generated response information to the master node 100, and transmits the control frame to the second slave node 200b connected to the first slave node 200a through the first port, (S309).

If the control frame including the response information or the response information within a predetermined time is not received from the second slave node 200b or the voltage detected by sensing the voltage of the communication line is less than a predetermined value, The first slave node 200a detects that a failure has occurred in the second slave node 200b at step S311 and transmits a control frame to the third slave node 200c connected through the second port of the first slave node 200a (S313).

The third slave node 200c checks the control information of the corresponding datagram in the control frame transmitted from the first slave node 200a (S315), performs an operation corresponding to the control information, (S317), and transmits only the response information to the master node 100 or the control frame including the response information to the master node 100 connected thereto through the first port (S319).

When receiving a control frame including response information or response information from the last slave node located on the data transmission path, the master node 100 confirms the response information or confirms the response information included in the control frame (S321) .

As a result, the master node 100 can confirm that the response information is not received from the second slave node 200b. Since the response frame for the second slave node 200b is not included in the control frame transmitted via the third slave node 200c, which is the last slave node, the master node 100 uses the slave node (S323), and can notify the manager thereof.

The control frame transmission method using the bypass path according to the embodiment of the present invention has been described above.

The control frame transmission method using the detour path of the present invention as described above may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. A control frame transmission method using a detour path according to an embodiment of the present invention is a control frame transmission system including a master node and a plurality of slave nodes, Detecting a failure of one of the nodes connected to the adjacent node or a neighboring node; if the node detects that a failure has occurred, the node is connected through the second port; And transferring the control frame to another node between the adjacent nodes.

At this time, the program recorded on the recording medium can be read and installed in the computer and executed, thereby executing the above-described functions.

In order to allow a computer to read a program recorded on a recording medium and to execute functions implemented by the program, the above-mentioned program may be stored in a computer-readable medium such as C, C ++, JAVA, machine language, and the like.

The code may include a function code related to a function or the like that defines the functions described above and may include an execution procedure related control code necessary for the processor of the computer to execute the functions described above according to a predetermined procedure. In addition, such code may further include memory reference related code as to what additional information or media needed to cause the processor of the computer to execute the aforementioned functions should be referenced at any location (address) of the internal or external memory of the computer . In addition, when a processor of a computer needs to communicate with any other computer or server that is remote to execute the above-described functions, the code may be stored in a memory of the computer using a communication module of the computer, It may further include a communication-related code such as how to communicate with another computer or a server, and what information or media should be transmitted or received during communication.

Such computer-readable media suitable for storing computer program instructions and data include, for example, magnetic media such as hard disks, floppy disks and magnetic tape, compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits.

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. The functional program for implementing the present invention and the related code and code segment may be implemented by programmers in the technical field of the present invention in consideration of the system environment of the computer that reads the recording medium and executes the program, Or may be easily modified or modified by the user.

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.

The present invention relates to a control frame transmission method using a bypass path, and more particularly, to a control frame transmission method using a bypass path, more specifically, by providing a communication line separate from a main communication line when connecting each node constituting an industrial network, A control frame transmission method using the bypass path, and a node and a control frame transmission system therefor.

INDUSTRIAL APPLICABILITY The present invention can contribute to the development of industrial Ethernet industry, and it is possible to be industrially applicable because it has a possibility of being commercially available or operating as well as being practically and practically possible.

100: master node 110: master communication section
110a: first port 110b: second port
120: Master control unit 120a: Frame generation module
120b: abnormality detection module 130:
200: Slave node 210: Slave communication part
220: operation performing unit 230: data processing unit

Claims (11)

A master node for generating a control frame including control information for controlling operation of each slave node located in a data transmission path and transmitting the generated control frame to a neighboring slave node connected downstream of the data transmission path; And
Receiving the control frame from the master node or a neighboring slave node located in the preceding stage of the data transmission path to check control information for operation control corresponding to the control frame in the control frame, A plurality of slave nodes communicating to the master node or another neighboring slave node located in the slave node;
/ RTI >
The master node and the slave node
And a second port for supporting a connection between a first port supporting connection between adjacent nodes and another node having at least a gap between the adjacent nodes,
Wherein when the failure occurs in a specific line connected to the adjacent node or the neighboring node when the control frame is transmitted using the first port, the control frame is transmitted using the second port. A master communication unit for transmitting a control frame that can be sequentially transmitted to a plurality of slave nodes located in a data transmission path; And
Generates a control frame including control information for controlling operation of each slave node located in the data transmission path, and transmits the generated control frame to the adjacent slave node connected to the rear end of the data transmission path through the master communication unit A master control unit;
/ RTI >
The master communication unit
And a second port for supporting a connection between the first slave node and the first slave node, the first port supporting connection with the adjacent slave node,
The master control unit
When a failure occurs in a communication line connected to the adjacent slave node or the adjacent slave node when transferring the control frame to the adjacent slave node using the first port, transmits the control frame to the other slave node via the second port To the master node. 3. The method of claim 2,
The master control unit
Detecting a voltage of the communication line and determining that a failure has occurred in the communication line when the sensed voltage is lower than a predetermined value,
A control frame including the response information or the response information is not received from the adjacent slave node within a predetermined time after the control frame is transmitted to the adjacent slave node or is transmitted through all the slave nodes located in the data transmission path And determines that a failure has occurred in the neighboring slave node if response information corresponding to the neighboring slave node is not included in the control frame. 3. The method of claim 2,
A master storage unit for storing port connection information for each slave node;
Further comprising:
The master control unit
If it is determined that a failure has occurred in both the neighboring slave node connected through the first port and the other slave node connected through the second port, the port connection information for each slave node previously stored in the master storage unit is checked, And transmits the control frame in a wireless communication manner to the corresponding slave node according to the connection information. Receiving a control frame transmitted by the master node from a master node or another slave node located in the preceding stage of the data transmission path and transferring the control frame to a data processing unit and transmitting a control frame to a neighboring node located at a rear end of the data transmission path, A slave communication unit;
A data processing unit for checking the control information of the corresponding datagram in the control frame when the control frame is transmitted through the communication unit; And
An operation performing unit operable to perform an operation corresponding to the control information confirmed by the data processing unit;
/ RTI >
The slave communication unit
And a second port for supporting a connection between a first port supporting connection between adjacent nodes and another node having at least a gap between the adjacent nodes,
The data processing unit
Wherein when the failure occurs in a certain line connected to the adjacent node or the adjacent node when the control frame is transmitted using the first port, the control frame is transmitted using the second port. 6. The method of claim 5,
The data processing unit
Detecting a voltage of a communication line connected through the first port and determining that a failure has occurred in the communication line when the sensed voltage is lower than a predetermined value,
Wherein if the response information is not received from the neighboring node within a predetermined time after the control frame is transmitted to the neighboring node, the slave node determines that a failure has occurred in the neighboring node. 6. The method of claim 5,
The data processing unit
If a fault has occurred in both of the neighboring node and the other node, reports a failure occurrence to the master node, and if information about another node connectable from the master node is received, And transmits the control frame. A control frame transmission system including a master node and a plurality of slave nodes,
Transmitting a control frame to a neighboring node through which a node is connected through a first port;
Detecting any one of the nodes having a fault in the communication line connected between the adjacent node or the adjacent node; And
And transmitting the control frame to another node connected to the neighboring node via a second port when the node detects that a failure has occurred,
Wherein the sensing comprises:
Detecting a voltage of the communication line and determining that a failure has occurred in the communication line when the sensed voltage is lower than a predetermined value,
A control frame including the response information or the response information is not received from the neighboring node within a predetermined time after the control frame is transmitted to the neighboring node,
If the received control frame does not contain the response information,
And determining that a failure has occurred in the neighboring node. delete 9. The method of claim 8,
After forwarding the control frame to the other node,
If it is determined that a fault has occurred in both the neighbor node and the other node, it checks the port connection information for each slave node previously stored in the master node, and transmits the control frame to the corresponding slave node in accordance with the checked port connection information, And transmitting the control frame using the bypass path. A computer-readable recording medium on which a program for executing a control frame transmission method using a detour path as recited in any one of claims 8 to 10 is recorded.

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