KR101990130B1 - Method for transmitting and receiving data between units connected in series - Google Patents

Abstract

The present invention relates to a method of transmitting and receiving data of a system in which a plurality of units are connected to each other in series through a predetermined communication line. Provided is a method for transmitting and receiving data comprising the steps of: notifying at least one master unit of the plurality of units; and selecting any two of the plurality of units as network managers based on network type by the communication line and a predetermined protocol shared to the plurality of units.

Description

[0001] METHOD FOR TRANSMITTING AND RECEIVING DATA BETWEEN UNITS [0002] CONNECTED IN SERIES [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transmitting / receiving data between mutually serially connected units, and more particularly, to a method of transmitting / receiving data between a master unit and slave units provided in a PLC (Programmable Logic Controller)

Recently, relays and counters for sequentially connecting control target devices performing each process according to the order of processes have been replaced with PLC devices.

The PLC device is a device for controlling the sequential driving of the control target devices according to the process sequence set by the user. When an automation facility is implemented using such a PLC device, there is an advantage that it is easy to change the order, addition, and deletion of the process.

The PLC device may be structured such that it can be installed in units of input / output modules connected to at least one control target device so that modification or expansion due to process change or change of control target device can be facilitated. That is, the PLC device may include a main module that performs operation processing for driving control and monitoring of control target devices, and at least one expansion module connected to the main module.

Here, each of the expansion modules is connected to at least one control target device, and can transmit collection data corresponding to the respective driving status or the driving status of the control target device to the main module.

The main module can transmit command data for controlling and monitoring the driving of the control target devices to each of the expansion modules, and each expansion module can drive the control target device based on the command data received from the main module .

To this end, the main module and the at least one extension module are connected in series through a predetermined communication line, and data can be transmitted and received through a network by the communication line. In such a network, the main module is a master unit, and each of the at least one extension module may be a slave unit.

According to a general data transmission / reception method, when each slave unit receives a downward message frame including command data or the like from the master unit, it transmits its uplink message frame to the master unit. That is, the downward message frame of the master unit becomes the transmission trigger for the uplink message frame of each slave unit.

Accordingly, in order to shorten the period in which the master unit receives the upstream message frame of the slave unit, it is necessary to shorten the period in which each slave unit receives the downstream message frame of the master unit. That is, the period in which the master unit transmits the downward message frame needs to be shortened. As a result, the processing load of the master unit can be increased.

The master unit is driven in an interrupt mode for receiving an uplink message frame at each time when an uplink message frame of each slave unit is received. Accordingly, there is a problem that the processing load of the master unit may be greatly increased as the number of slave units connected to the master unit increases.

As described above, there is a problem that the dependency of the master unit in the data transmission / reception between the master unit and each slave unit is relatively high due to transmission of the upstream message frame based on the time when each slave unit receives the downward message frame of the master unit . Accordingly, there is a problem in that the processing load of the master unit is greatly increased as the number of slave units is increased, and the real-time performance of data transmitted and received between the master unit and each slave unit may be degraded.

The present invention provides a data transmitting / receiving method capable of improving the real time performance of data transmitted / received between a master unit and each slave unit.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a data transmission / reception method for a system in which a plurality of units are connected in series through a predetermined communication line, wherein at least one master unit among the plurality of units is known Selecting either one of the plurality of units as a network manager based on a network type by the communication line and a predetermined protocol shared among the plurality of units; Wherein at least one slave unit selected by the network manager among the two or more slave units is transmitting a message frame including transmission data to a neighboring unit on each side along a transmission direction corresponding to each network manager, And selecting one of the two or more slave units as the network manager The slave units other than one receive the message frame from a unit neighboring each side along the transmission direction, update the message frame based on the respective delivery data, and transmit the updated message frame to each And transmitting the data to a neighboring unit on the other side.

In each of the steps of transmitting a message frame by at least one slave unit selected by the network manager and transmitting the message frame by the remaining slave unit, the transmission of the message frame is performed at each predetermined delivery period.

Wherein the destination of the message frame is any one of the at least one master unit and the master unit designated as the destination of the message frame receives the message frame from a neighboring unit on one side along the forwarding direction have.

The transmission directions corresponding to the two network managers are opposite to each other.

When two units neighboring the both sides of the unit in the driving stop state sense the unit in the driving stop state in the case where the unit in the driving stop state is detected while the network is in the ring shape, Wherein at least one of the two neighboring units on both sides of the driving stop state informs the plurality of units of the unit in the driving stop state and the two neighboring units on both sides of the unit in the stopped driving state are selected by the network manager Step < / RTI >

When the unit in the driving stop state is restored to a normal state, if two neighboring units on both sides of the recovered unit sense the recovered unit, at least one of two neighboring units to the recovered unit The method comprising the steps of: informing a recovered unit of the plurality of units, and selecting any one of the plurality of units conforming to a predetermined condition according to the protocol and selecting any one of the selected one unit and the other one adjacent to the selected unit A unit of the network manager may be selected as the network manager.

When two or more of the plurality of units are selected as a network manager, if the network is in a line form, two units disposed at both ends of the network among the plurality of units are selected as the network manager.

According to the data transmission / reception method as described above, any two of the master unit and the plurality of units including two or more slave units can be selected as the network manager. That is, not only the slave unit but also the master unit can be selected as the network manager.

At least one slave unit selected as a network manager among the two or more slave units transmits a message frame including each delivery data to a neighboring unit on each side along a transmission direction corresponding to each network manager. Subsequently, the slave units other than the at least one selected as the network manager among the two or more slave units receive the message frame from the neighboring unit on each side along the forwarding direction, update the message frame based on the respective forwarding data, And transmits the updated message frame to the units neighboring each other. Here, the destination of the message frame is one of the at least one master unit, and the master unit designated as the destination of the message frame receives the message frame from the neighboring unit on one side along the delivery direction.

In this manner, the two or more slave units can transmit respective delivery data to the master unit using a message frame transmitted from each neighboring unit, including the network manager, as a transmission trigger, rather than a transmission trigger by the master unit. Therefore, even if the master unit does not shorten the period of transmitting the message frame to each slave unit, the period in which the master unit receives the transfer data of each slave unit can be shortened. This has the advantage that the processing load of the master unit can be reduced.

Then, the master unit receives at least one message frame from a neighboring unit along a transmission direction corresponding to the network manager. Here, the message frame includes transfer data of each of the slave units selected by the network manager and at least one slave unit disposed between the slave units adjacent to the master unit. Thus, the master unit does not receive the message frame of each slave unit, but receives at most two message frames from neighboring units on both sides thereof. Therefore, there is an advantage that the number of times of driving in the interrupt mode for reception of the message frame can be reduced, thereby reducing the processing load of the master unit.

As described above, since the transfer data of each slave unit is transmitted to the master unit, the reliance on the master unit is reduced, so that the real-time degradation of the data due to the processing load of the master unit can be prevented. That is, the real-time performance of data transmitted and received between the master unit and each of the slave units can be improved.

In addition, regardless of whether it is a slave unit and the position of each slave unit with respect to the master unit, any two of the plurality of units corresponding to the conditions according to the protocol are selected as the network managers. Accordingly, there is an advantage that it can be easily applied to both a ring-shaped network and a line-shaped network.

Also, even if a ring network is changed to a line type as a unit becomes a driving stop state, data transmission and reception can be easily maintained by selecting a network manager corresponding to a network in a line form. Thus, reliability of data transmission / reception from each slave unit to the master unit can be improved.

1 is a diagram illustrating an example of a system in which a plurality of units are connected in series according to a first embodiment of the present invention.
2 is a diagram showing another example of a system in which a plurality of units are connected in series according to a first embodiment of the present invention.
3 is a diagram illustrating a data transmission / reception method according to a first embodiment of the present invention.
FIGS. 4, 5, 6, and 7 are views showing an example of some steps of FIG. 3 in the example of FIG.
FIG. 8 is a diagram illustrating an example of some steps of FIG. 3 in another example of a system in which a plurality of units are connected in series according to a first embodiment of the present invention.
Fig. 9 is a diagram showing another example of some steps of Fig. 3 in the example of Fig.
FIG. 10 is a view showing some steps of FIG. 3 in the example of FIG. 2;
11 is a diagram illustrating a data transmission / reception method according to a second embodiment of the present invention.
12, 13, 14, and 15 are views showing an example of some steps of FIG.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

First, a system according to a first embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig.

1 is a diagram illustrating an example of a system in which a plurality of units are connected in series according to a first embodiment of the present invention. 2 is a diagram showing another example of a system in which a plurality of units are connected in series according to a first embodiment of the present invention.

1, a system 10 includes a plurality of units (Unit # 1, Unit # 2, Unit # 1) connected in series through a predetermined communication line 11 as shown in FIG. 1, 3, ..., Unit #i, Unit # i + 1, ..., Unit # n-1, Unit #n). (Where n is a natural number of 7 or more, i is a natural number of 4 or more and n or less)

For example, at least one of a plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit #i, Unit # i + 1 to Unit # n- (Unit # 1 in FIG. 1) is a master unit, and two or more remaining units (Unit # 2, Unit # 3, Slave unit.

1 shows a case where a plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit #i, Unit # i + 1 to Unit # n- (Unit # 1, Unit # 2, Unit # 3, ..., Unit #i, Unit # i + 1, ..., Unit # n-1), but the present invention is not limited to this. , Unit #n) may include two or more master units.

Illustratively, when the system is a PLC device, the master unit (Unit # 1) is a main module for executing calculation and monitoring for control of drive of the control target devices, and the slave units (Unit # 2, Unit # 3, #i, Unit # i + 1, ..., Unit # n-1, Unit #n) may be an extension module disposed between at least one control target device and the main module. Alternatively, some of the slave units (Unit # 2, Unit # 3, to Unit # i, Unit # i + 1 to Unit # n-1, Unit # n) may be control target devices.

Each of the plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit # i, Unit # i + And a second port P1, P2.

Although not shown in detail in FIG. 1, each of the plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit #i, Unit # i + 1 to Unit # n- And an input / output unit (not shown) for receiving a message frame through one of the first and second ports P1 and P2 and transmitting the message frame through the other port P1 and P2.

Here, the input / output unit (not shown) includes an output buffer unit for temporarily storing transfer data to be transmitted to another unit, a frame generation unit for generating or updating a message frame so as to include transfer data of the output buffer unit, And an input buffer unit for temporarily storing delivery data of a message frame that specifies itself as a destination.

The plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit #i, Unit # i + 1, ..., Unit # n-1, Unit #n) share a predetermined protocol for data transmission and reception. By way of example, the protocol may correspond to a RAPIEnet network. As an example, the predetermined protocol may be at least one of IEC 61158 type 21 and IEC 62439-7.

The plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit #i, Unit # i + Share data about each other. Alternatively, the plurality of units (Unit # 1, Unit # 2, Unit # 3, to Unit # i, Unit # i + 1 to Unit # n- They may be mutually shared.

Any two of the plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit #i, Unit # i + 1 to Unit # n- And is selected as a network manager based on this. Here, the transmission directions corresponding to the two network managers are mutually opposite.

That is, the transmission direction corresponding to one of the two network managers may be clockwise, and the transmission direction corresponding to the other two network managers may be counterclockwise, so that the two network managers do not transmit and receive the message frame to each other.

In other words, the transmission direction corresponding to any one of the network managers may be the direction from the first port P1 of the transmission unit to the second port P2 of the reception unit. Conversely, the transmission direction corresponding to the other remaining network manager may be the direction from the second port P2 of the transmission unit to the first port P1 of the reception unit.

A message frame by at least one slave unit selected as a network manager among two or more slave units is transmitted to a neighboring unit along the transmission direction corresponding to the network manager for each delivery period until reaching the master unit (Unit # 1) Sequentially transmitted.

Here, the message frame by any one of the slave units selected as the network manager includes the transfer data of each of the slave units and at least one of the slave units disposed between the slave units adjacent to the master unit (Unit # 1).

The delivery period may be specified by the user or by a predetermined default according to the protocol. As an example, the delivery period may be 0.1 ms.

The plurality of units (Unit # 1, Unit # 2, Unit # 3, ..., Unit # i, Unit # i + 1, A network information section that holds data for at least one of an ID and a location of other units, an ID of the master unit, and a location of each of the master unit and the network manager, and an ID of the network manager and a location of the network manager, respectively . In particular, the network information unit can retain the IDs of the master unit and the network manager.

In addition, the network information section can further retain data on the network type by the communication line 11. [

For example, the network information unit of at least one unit broadcasts a network detection message including whether the corresponding unit is a master unit or a slave unit and an ID of the slave unit, 1) or in the form of a line (Fig. 2), and may retain data regarding the detected network type.

Illustratively, the network detection message may be broadcast by at least one master unit (Unit # 1). Further, in order to periodically detect the network status, the network detection message can be broadcast periodically.

1, Unit # n-1, Unit # 2, Unit # 3, and Unit # i, n are mutually cascaded, the network detection message can be returned. Thus, if the network detection message is returned, it can be detected as a ring-shaped network.

Alternatively, as shown in FIG. 2, if the network is in the form of a line, that is, a plurality of units (Unit # 1, Unit # 2, Unit # 3 to Unit #i, Unit # i + Unit #n) are interconnected in series and the units of either of them (Unit #i, Unit # i + 1) are not interconnected, the network detection message can not be returned. Thus, if the network detection message is not returned within a predetermined period, it can be detected as a network in the form of a line.

Next, a data transmission / reception method according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 11. FIG.

3 is a diagram illustrating a data transmission / reception method according to a first embodiment of the present invention. FIGS. 4, 5, 6, and 7 are views showing an example of some steps of FIG. 3 in the example of FIG. FIG. 8 is a diagram illustrating an example of some steps of FIG. 3 in another example of a system in which a plurality of units are connected in series according to a first embodiment of the present invention. Fig. 9 is a diagram showing another example of some steps of Fig. 3 in the example of Fig.

Figs. 10 and 11 are views showing some steps of Fig. 3 in the example of Fig.

As shown in FIG. 3, a data transmitting / receiving method according to a first embodiment of the present invention includes a step (S10) of notifying at least one master unit of a plurality of units to a plurality of units, a communication line A step S30 in which any two units of the plurality of units are selected as a network manager based on the network type and a predetermined protocol shared among the plurality of units, (S40) of at least one slave unit selected as one of the slave units among the slave units among the plurality of slave units selected by the network manager in accordance with a transmission direction corresponding to each network manager The slave units other than the network manager are moved from the unit adjacent to each side along the transmission direction (S50) receiving the message frame, updating the message frame based on the respective transmission data, and transmitting the updated message frame to a unit adjacent to each other side (S50), and when the unit in which the message frame is reached is the master unit S61), if the destination of the message frame is the ID of the corresponding master unit (S62), any one of the master units designated as the destination of the message frame receives the message frame from the neighboring unit on one side along the delivery direction .

If the destination of the message frame is not the ID of the corresponding master unit (S62), the master unit not designated as the destination of the message frame transmits the message frame (S64) transmitting a message frame received from a neighboring unit on each side to a neighboring unit on the other side along a forwarding direction.

At this time, in each of the at least one slave unit selected as the network manager, the message frame is transmitted (S40) and the remaining slave unit transmits the message frame (S50), the transmission of the message frame is performed at each predetermined delivery cycle do.

Although not shown in FIG. 3, in addition to the transmission data of two or more slave units being transmitted to the master unit, the master unit can transmit a downward message frame corresponding to each slave unit in a predetermined downward cycle. Here, the downward cycle is set separately from the delivery cycle.

Hereinafter, a method of transmitting and receiving data will be described with reference to examples.

4, 5, 6 and 7 show a plurality of units (Unit # 1, Unit # 2, Unit # 3, Unit # 4, Unit # 5, Unit # 6, (Hereinafter referred to as "Unit # 1 to Unit 7"). Here, the first unit (Unit # 1) of the plurality of units (Unit # 1 to # 7) is the master unit and the remaining second, third, fourth, fifth, sixth, , Unit # 3, Unit # 4, Unit # 5, Unit # 6, Unit # 7) are slave units. The second unit (Unit # 2) and the seventh unit (Unit # 7) are arranged on both sides of the first unit (Unit # 1) which is the master unit.

As shown in Fig. 4, at least one unit including a first unit (Unit # 1) which is a master unit among a plurality of units (Unit # 1 to Unit # 7) And broadcasts a Network Sensing message (NS). At least one master unit (Unit # 1) is notified to the plurality of units (Unit # 1 to # 7) through broadcasting of the network detection message (NS). (S10)

Here, the network detection message NS may include whether the corresponding unit is a master unit or a slave unit and an ID of the corresponding unit.

For example, at least one master unit (Unit # 1) of the plurality of units (Unit # 1 to # 7) may broadcast each network detection message (NS). Thereby, at least one master unit (Unit # 1) can be known.

Alternatively, a plurality of units (Unit # 1- # 7) may broadcast respective network detection messages (NS). Thereby, a plurality of units (Unit # 1 to Unit # 7) connected in series through the communication line can mutually recognize the role and the ID.

Alternatively, the unit for broadcasting the network detection message NS may be selected as a part of two or more slave units (Unit # 2 to # 7) and at least one master unit (Unit # 1).

At least one unit broadcasting the network detection message (NS) detects the network type based on whether or not the network detection message (NS) is returned. (S20)

That is, if the network type is a ring type, the network detection message NS can be returned, so that when the network detection message NS is returned, the network can be detected as ring type. At this time, the detected network type is known to a plurality of units.

5, any two of the plurality of units (Unit # 1 to # 7) are selected based on the network type and a predetermined protocol shared among the plurality of units (Unit # 1- # 7) 5 to Unit # 6, Unit # 7) is selected as the network manager (M). (S30)

Here, if the network is ring-shaped, any one of the plurality of units (Unit # 1 to # 7) meeting the predetermined condition according to the shared protocol is selected, and the selected one unit and the selected unit Any other neighboring unit may be selected as the network manager M. [

As an example, the predetermined condition according to the protocol may be the ID of the maximum value. In this case, the seventh unit (Unit # 7) having the maximum value among the plurality of units (Unit # 1 to # 7) shown in FIG. 5 and the first unit Unit # 1) and the sixth unit (Unit # 6) may be selected as the network manager M.

5 shows that the network manager M is selected as the slave units, that is, the seventh unit (Unit # 7) and the sixth unit (Unit # 6) are selected as the network manager M.

6, at least one slave unit (Unit # 6, Unit # 7) selected by the network manager M among the two or more slave units (Unit # 2- # 7) The message frames MF1 and MF2 including the respective transfer data (# 6_DATA and # 7_DATA) are transmitted to the unit (Unit # 1) adjacent to each side along the transmission direction (arrow curve in FIG. 6) , Unit # 5). (S40)

Specifically, the transmission directions corresponding to the two network managers M are opposite to each other. In other words, the two network managers M are arranged in the direction opposite to each other in the direction opposite to each other, toward one of the at least one master unit (Unit # 1) toward the destination (Des_ # The message frames MF1 and MF2 are transmitted.

According to the example of Fig. 6, the transmission direction corresponding to the seventh unit (Unit # 7), which is one of the network managers, is a counterclockwise direction opposite to the direction toward the sixth unit (Unit # 6) to be. Here, the counterclockwise direction may be the direction from the second port (P2) of the transmitting unit to the first port (P1) of the receiving unit.

The transmission direction corresponding to the sixth unit (Unit # 6), which is the other network manager, is the clockwise direction opposite to the direction toward the seventh unit (Unit # 7). Here, the clockwise direction may be the direction from the first port (P1) of the transmitting unit to the second port (P2) of the receiving unit.

In this case, in the first transmission period TP1, the seventh unit (Unit # 7), which is one of the network managers, transmits the message frame MF1 including the transfer data (# 7_DATA) of the seventh unit in the counterclockwise direction To the first unit (Unit # 1) adjacent to one side.

Then, in the first transmission period TP1, the sixth unit (Unit # 6), which is another network manager, transmits the message frame MF2 including the transfer data (# 6_DATA) of the sixth unit in a clockwise direction To the neighboring fifth unit (Unit # 5).

7, at least one slave unit (Unit # 6, Unit # 7) except for at least one slave unit (Unit # 6, Unit # 7) selected by the network manager M among two or more slave units (Unit # 2- # 7) 5, Unit # 4, Unit # 3, and Unit # 2 receive message frames MF2 from neighboring units on the respective sides in the respective transfer periods TP1, TP2, TP3, and TP4 . The remaining slave units (Unit # 5, Unit # 4, Unit # 3 and Unit # 2) update the message frame MF2 based on the respective transfer data (# 5_DATA, # 4_DATA, # 3_DATA and # 2_DATA) do. Subsequently, the remaining slave units Unit # 5, Unit # 4, Unit # 3, and Unit # 2 move the message frame MF2 updated in each delivery period TP2, TP3, TP4, And transmits it to the neighboring unit on the other side. (S50)

Specifically, in the first delivery period TP2, the fifth unit (Unit # 5) receives the message frame MF2 from the neighboring sixth unit (Unit # 6) (# 5_DATA) of the fifth unit to the message frame MF2 to update the message frame MF2. Then, in the second transmission period TP2, the fifth unit (Unit # 5) transmits the updated message frame MF2 to include its own transfer data (# 5_DATA) to the fourth unit (Unit # 4).

Thus, in the second transmission period TP2, the fourth unit (Unit # 4) receives the message frame MF2 and inserts the transfer data (# 4_DATA) of the fourth unit in the received message frame MF2 And updates the message frame MF2. Then, in the third delivery period TP3, the fourth unit Unit # 4 transmits the message frame MF2 updated to include its own delivery data # 4_DATA to the third unit Unit # 3).

Thus, in the third transmission period TP3, the third unit (Unit # 3) receives the message frame MF2 and inserts the transfer data (# 3_DATA) of the third unit into the received message frame MF2 And updates the message frame MF2. Subsequently, in the fourth transmission period TP4, the third unit Unit # 3 transmits the message frame MF2 updated to include its own transfer data (# 3_DATA) to the second unit (Unit # 2).

Thus, in the fourth transmission period TP4, the second unit (Unit # 2) receives the message frame MF2 and inserts the transfer data (# 2_DATA) of the second unit in the received message frame MF2 And updates the message frame MF2. Subsequently, in the fifth transmission period TP5, the second unit (Unit # 2) transmits the updated message frame MF2 to include its own transfer data (# 2_DATA) to the first unit (Unit # 1).

In this manner, at least one of the slave units (Unit # 7, # 7) selected by the network manager M through the process of sequentially transmitting the message frames at the respective transmission periods TP1, TP2, TP3, TP4, The message frames MF1 and MF2 corresponding to the first unit (Unit # 6) are reached to the first unit (Unit # 1) which is the master unit.

At this time, each of the message frames MF1 and MF2 is composed of transfer data of at least one slave unit disposed between at least one slave unit (Unit # 7, Unit # 6) and the master unit (Unit # 1) And a transmission destination (Send_ # i).

The unit in which the message frame MF2 corresponding to the sixth unit (Unit # 6) which is the network manager M is reached is the master unit (Unit # 1) (S61) and the destination of the message frame (Des_ # 1) When one of the master units (Unit # 1) designated as the destination of the message frame (Des_ # 1) corresponds to the ID (# 1) of the corresponding master unit (S62) And receives a message frame MF2 from a second unit (Unit # 2).

Similarly, as shown in Fig. 6, the unit in which the message frame MF1 corresponding to the seventh unit (Unit # 7) as the network manager M is reached is the master unit (Unit # 1) (S61) If the destination (Des_ # 1) of the master unit (MF1) corresponds to the ID (# 1) of the master unit (S62), any one of the master units (Unit # Receives a message frame MF1 from a seventh unit (Unit # 7) adjacent to one side along the transmission direction (counterclockwise direction).

As described above, according to the first embodiment of the present invention, the master unit (Unit # 1) receives the message frames MF1 and MF2 to be received therefrom on the basis of the destination Des_ # of the message frames MF1 and MF2 Can be distinguished. Accordingly, unlike the examples of Figs. 4, 5, 6 and 7, two or more of the plurality of units (Unit # 1 to # 7) can be master units.

That is, as shown in FIG. 8, the first and fourth units (Unit # 1 and Unit # 4) of the plurality of units (Unit # 1 to # 7) can be master units. In this case, the message frame MF2 may include the transfer data of at least one slave unit having the same destination (Des_ # 1).

The remaining master units (Unit # 4) except for the master unit (Unit # 1) specified by the destination (Des_ # 1) of the message frame among the at least one master unit (Unit # 1 and Unit # 4) And transmits the message frame MF2 received from one unit Unit # 5 to the unit (Unit # 3) adjacent to the other side in each delivery period TP3. (S63)

According to the first embodiment of the present invention, any two units of the plurality of units (Unit # 1 to # 7) can be selected as the network manager M regardless of whether the master unit or the slave unit .

9, if the network is in a ring form, any unit (Unit # 7) meeting a predetermined condition according to a shared protocol among the plurality of units (Unit # 1 to # 7) Any selected unit (Unit # 7) and any other neighboring unit (Unit # 1) may be selected as the network manager (M).

In this case, at least one slave unit (Unit # 1) disposed between the master unit (Unit # 1) and at least one slave unit (Unit # 7) selected by the network manager M among the two or more slave units (# 6_DATA, # 5_DATA, # 4_DATA, # 5_DATA, # 5_DATA, and # 4_DATA) are transmitted from the respective delivery periods TP2, TP3, TP4, TP5, and TP6 , # 3_DATA, and # 2_DATA) to the neighboring unit on the other side along the transmission direction.

Thus, in the sixth transmission period TP6, the message frame MF transmitted to the master unit (Unit # 1) is transmitted to the transmission data # 7 of the seventh, sixth, fifth, fourth, third, 7_DATA, # 6_DATA, # 5_DATA, # 4_DATA, # 3_DATA, and # 2_DATA) and their respective transmission destinations (Send_ #).

Alternatively, unlike the example of FIGS. 4-9, according to the first embodiment of the present invention, the network may be in the form of a line.

That is, as shown in FIG. 10, if the network type is in the form of a line, the network detection message NS can not be returned, so that the network can be detected as a line if the network detection message NS is not valuable. At this time, the detected network type is known to a plurality of units. (S20)

Subsequently, any two units (Unit # 4 and Unit # 5 in FIG. 10) of the plurality of units (Unit # 1 to # 7) are connected to the network manager M). (S30)

Here, if the network is in the form of a line, two units (Unit # 4 and Unit # 5) disposed at both ends of the network among the plurality of units (Unit # 1 to Unit 7) .

The process of transmitting a message frame corresponding to at least one slave unit (Unit # 4, Unit # 5) selected by the network manager M to the master unit (Unit # 1) (S40, S50) Are the same as those described in the example, and thus redundant description will be omitted below.

As described above, the data transmission / reception method according to the first embodiment of the present invention can be easily applied to both a ring network and a line network.

Accordingly, when a ring network is changed into a network in the form of a line by a certain unit being in a driving stop state, data is transmitted / received between the master unit and the slave unit through a process of selecting a network manager corresponding to the network in a line- Can be maintained.

11 is a diagram illustrating a data transmission / reception method according to a second embodiment of the present invention. 12, 13, 14, and 15 are views showing an example of some steps of FIG.

11, the method for transmitting and receiving data according to the second embodiment of the present invention includes a step S20 'of detecting a network in the form of a ring, a step of detecting a network type and a plurality of units (S30), at least one slave unit selected as a network manager among the two or more slave units transmits a message frame including the respective delivery data to a transmission direction corresponding to each network manager (Step S40). In step S40, the slave units other than the network manager among the two or more slave units receive message frames from units neighboring each other along the forwarding direction, Updates the message frame based on the data and updates the updated message frame (S50). When a unit in the driving stop state is generated, two neighboring units on both sides of the unit in the driving stop state sense the unit in the driving stop state (S71) (S72), at least one of two neighboring units on both sides of the unit in the driving stop state notifies the plurality of units of the unit in the driving stop state, (S73). When the unit in the driving stop state is restored to the normal state, if two neighboring units on both sides of the restored unit sense the recovered unit (S81) (S82) of notifying a unit in which at least one of the one or two units has been restored to a plurality of units, and a step in which any one of the plurality of units conforming to a predetermined condition according to a protocol is selected,And a step (S30) in which the selected one of the other units neighboring the selected one unit is selected as a network manager, as in the first embodiment. Therefore, redundant description will be omitted below.

As shown in Figs. 5, 6 and 7, in a ring network, message frames corresponding to at least one slave unit selected by the network manager correspond to each destination (Des_ # 1) To a master unit (Unit # 1).

At this time, as shown in Fig. 12, any one unit (Unit # 4) of the plurality of units (Unit # 1 to Unit # 7) can be in the driving stop state. For example, any one unit (Unit # 4) can be brought into a driving stop state by a power supply failure and a malfunction.

At this time, the unit (Unit # 4) in the driving stop state can not transmit the driving normal signal to the units (Unit # 3 and Unit # 5) neighboring to both sides. Thus, two units (Unit # 3, Unit # 5) adjacent to both sides of the unit (Unit # 4) in the driving stop state are connected to the unit # 4), it is possible to detect that the unit (Unit # 4) in the driving stop state has been generated.

When two neighboring units (Unit # 3 and Unit # 5) detect the unit (Unit # 4) in the driving stop state (S71) on both sides of the unit (Unit # 4) At least one of the two units (Unit # 3, Unit # 5) adjacent to both sides of the unit (Unit # 4) ). (S72)

At this time, due to the unit (Unit # 4) in the driving stop state, the ring network changes in a line form.

Therefore, in a network that has changed in a line form, two units (Unit # 3 and Unit # 5) neighboring to both sides of the unit (Unit # 4) They are not interconnected. That is, two units (Unit # 3 and Unit # 5) neighboring to each other on both sides of the unit (Unit # 4) in the driving stop state are disposed at both ends of the network which are changed in a line form.

As shown in Fig. 13, when the unit (Unit # 4) in the driving stop state is known, the plurality of units (Unit # 1 to Unit # 7) select a network manager corresponding to the line-shaped network. That is, any two of the plurality of units (Unit # 1- # 7) is selected as the network manager (M) corresponding to the line-shaped network based on the protocol.

Thus, two units (Unit # 3 and Unit # 5), which are disposed at both ends of the line-shaped network among the plurality of units (Unit # 1 to # 7) and are adjacent to both sides of the unit Is selected as the network manager (M). (S73)

14, transmission of each slave unit (Unit # 3, Unit # 2) (Unit # 5, Unit # 6, Unit # 7) is performed by using the network manager M corresponding to the network in the form of a line. Data #_DATA is inserted into the message frames MF1 and MF2 and the message frames MF1 and MF2 are sequentially transmitted between the units for each transfer period TP1, TP2 and TP3, .

Then, as shown in Fig. 15, the unit (Unit # 4) in the driving stop state can be restored to the normal state. At this time, the restored unit (Unit # 4) can transmit the drive steady signal to units (Unit # 3 and Unit # 5) neighboring to both sides. Thus, two units (Unit # 3 and Unit # 5) neighboring to the restored unit (Unit # 4) are connected to the restored unit (Unit # 4) among the first and second ports P1 and P2 When the driving normal signal is detected in any one of the connected units, it is possible to detect that the unit (Unit # 4) in the driving stop state is restored to the normal state.

When two neighboring units (Unit # 3 and Unit # 5) on both sides of the restored unit (Unit # 4) detect the restored unit (Unit # 4) (S81) At least one of the two units (Unit # 3, Unit # 5) adjacent to both sides of the unit # 1 to # 4 notifies the unit (Unit # 4) recovered to the plurality of units (Unit # 1 to # 7). (S82)

At this time, due to the restored unit (Unit # 4), the line-shaped network is changed into a ring form.

Thus, when the restored unit (Unit # 4) is announced, the plurality of units (Unit # 1 to Unit # 7) select a network manager corresponding to the ring-shaped network.

That is, since the network is ring-shaped, any one of a plurality of units (Unit # 1 to # 7) meeting the predetermined condition according to the protocol is selected, and the selected one unit and the selected neighboring unit Any other unit is selected as the network manager. (S30 ')

Then, the transfer data of the slave unit is transferred to the master unit by using the network manager corresponding to the ring-shaped network. (S40, S50)

As described above, according to the second embodiment of the present invention, when one of the plurality of units (Unit # 1 to Unit # 7) enters the driving stop state and thereby the ring network is changed in a line form, The data transmission / reception can be maintained through the process (S73) in which the network manager corresponding to the line-shaped network among the plurality of units (Unit # 1 to # 7) is selected without stopping. As a result, the reliability of the apparatus can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

10: System
11: Communication line
Unit # 1 to # 7: A plurality of units
P1, P2: First and second ports
NS: network detection message
TP: Delivery cycle
MF: message frame
Des_ #: Destination of message frame
#_DATA: Transfer data of each slave unit
Send_ #: The destination of the transfer data

Claims (11)

A method of transmitting and receiving data in a system in which a plurality of units including at least one master unit and two or more slave units are connected in series through a predetermined communication line,
Wherein said at least one master unit is known to said plurality of units;
Wherein two of the plurality of units are selected as a network manager based on a network type by the communication line and a predetermined protocol shared by the plurality of units, and at least one of the two selected network managers The step being the slave unit;
Transmitting at least one slave unit as a network manager among the two or more slave units to a neighboring unit on one side along a transmission direction corresponding to each network manager; And
Receiving a message frame from a unit neighboring to one side of each of the slave units except for at least one slave unit that is the network manager among the two or more slave units and updating the message frame based on the respective delivery data, Transmitting the updated message frame to a unit neighboring each other;
Receiving a message frame from a neighboring unit on one side of the at least one master unit, the master unit designated as a destination of the message frame;
When the network is ring-shaped and a unit in the driving stop state is generated among the plurality of units, when two neighboring units on both sides of the unit in the driving stop state sense the unit in the driving stop state, At least one of two units adjacent to both sides of the unit of the unit of the driving stop state informs the plurality of units of the unit in the driving stop state and the two network managers are connected to two units adjacent to both sides of the unit in the driving stop state A step of changing; And
When the unit in the driving stop state is restored to a normal state, if two neighboring units on both sides of the recovered unit sense the recovered unit, at least one of two neighboring units to the recovered unit And the network manager selects one of the plurality of units conforming to a predetermined condition according to the protocol, and the network manager notifies the selected one unit and the other And changing back to any one of the units.
The method according to claim 1,
Wherein the transmission of the message frame is performed at each predetermined delivery period in each of the at least one slave unit being the network manager transmitting a message frame and the remaining slave unit transmitting a message frame.
delete The method according to claim 1,
Wherein a master unit other than a master unit designated as a destination of the message frame among the at least one master unit transmits a message frame received from a unit adjacent to one side of each of the at least one master unit to a neighboring unit Further comprising the steps of:
The method according to claim 1,
At least one of the plurality of units broadcasting a network detection message to the plurality of units; And
And detecting the network type based on whether or not the network detection message is returned.
The method according to claim 1,
Wherein the transmission directions corresponding to the two network managers are opposite to each other.
The method according to claim 1,
Wherein, in the step of selecting any two units among the plurality of units as a network manager, if the network is ring-shaped, any one of the plurality of units conforming to a predetermined condition according to the protocol is selected, And any other unit adjacent to the selected unit is selected as the network manager.
delete delete The method according to claim 1,
A data transmission and reception method in which two units disposed at both ends of the network among the plurality of units are selected by the network manager in the step of selecting either of the plurality of units as a network manager .
The method according to claim 1,
Wherein the protocol corresponds to a RAPIEnet network.

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