KR101747365B1 - Socket Board for Serial Communication without T-Branch and System for Motor Control Center using It - Google Patents

Abstract

A socket board for a serial communication in which a stub is minimized according to the present invention is a socket board including a first socket, a second socket and a third socket, wherein, in the non-excited state, Reception signal pins of the first and second sockets and the first and second transmission and reception signal pins of the second and third sockets and the second and third sockets of the second and third sockets in an energized state, And a relay unit for electrically connecting two transmission / reception signal pins, wherein the first transmission / reception signal pin and the second transmission / reception signal pin are configured separately.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a socket board for a T-branchless serial communication connection and a system for a motor control board using the socket board.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a socket board for a serial communication connection and a system for a motor control board that performs serial communication using such a socket board.

1 is a diagram showing a schematic configuration of a motor control center (MCC) and a motor control panel system applied thereto (this is a non-disclosure invention of the present applicant).

The master device ('integrated module') in the motor control center (MCC) collects and transfers data by performing serial communication with a plurality of slave devices ('protection control module') through serial communication.

The integrated module is in communication with all the protection control modules by applying the integrated module communicating with the protection control modules of the unit unit to the inlet unit of the motor control panel. The computer or PLC of the central monitoring room is provided with one integrated module This is an example of a configuration that improves management efficiency by communicating only with overhead.

In such a configuration, the T branch connector can be used as shown. By using the T branch connector, the specific slave device can be connected to or disconnected from the communication network without affecting other slave devices. For example, Connecting the communication cable directly to the slave device without using the T-branch connector makes it difficult to connect or disconnect the slave device in the middle of the network.

Fig. 2 shows an example of a T-branch connector having three sockets. Fig. 2 (a) is an external view and Fig. 2 (b) is an internal circuit diagram.

In the three sockets, the transmit and receive signal pins (Ta, Tb) are connected together using an internal line and form a T-branch connection to the device connected to Socket 2.

Fig. 3 is a circuit diagram showing an example of a network configuration using a T branch connector. Fig. 3 (a) shows a T branch connector, Fig. 3 (b) .

As shown in the figure, it can be seen that the serial communication line is branched by T branching connector and connected to each slave device.

However, in a facility such as a motor control panel, a user must be able to take out a unit unit, so that the slave device ('protection control module') of the unit unit is located in the unit unit and the T branch connector is installed outside the unit unit do.

Therefore, the stub formed by the communication line between the socket 2 of the T-branch connector and the slave device may have a length of at least 1 meter and a length of at least 3 meters. In the motor control panel, Such a stub is formed for each unit.

However, such a long stub invites an impedance mismatch, thereby causing a reflection of a signal to increase the possibility of occurrence of a communication failure.

In order to solve this problem, a method of limiting the number of slave devices in the T branch can be used. However, in such a case, there is a problem that a converter or a separate collecting device must be installed in each predetermined area. The number of the slave devices to be guaranteed and the length of the communication line may be changed, so that there is a problem that accurate installation specifications can not be presented.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

SUMMARY OF THE INVENTION An object of the present invention is to provide a serial communication connector ('socket board') in which a communication line between a connector and a slave device can be extended in a network configuration for serial communication.

Another object of the present invention is to provide a serial communication connector (" socket board ") in which impedance mismatch or reflection due to T-branching in a network configuration for serial communication can be reduced.

Another object of the present invention is to provide a system for a motor control panel in which a communication line between a connector and a module in a unit unit can be elongated.

According to an aspect of the present invention, there is provided a socket board for serial communication in which a stub is minimized, the socket board including a first socket, a second socket, and a third socket,

Receiving signal pin of the first socket and the transmitting / receiving signal pin of the third socket when the first socket is in the non-excited state, and the first transmitting / receiving signal pin of the first socket and the first transmitting / And a relay unit electrically connecting the transmission signal terminal of the third socket and the second transmission signal terminal of the second socket, wherein the first transmission signal pin and the second transmission signal pin are respectively independent of each other, . ≪ / RTI >

In the socket board described above, the power source for the excitation of the relay unit is supplied from a slave device connected to the second socket through a plug, whereby when the plug is disconnected from the second socket, The supply of the voltage is stopped and the non-excitation state can be obtained.

According to an aspect of the present invention, there is provided a socket board for serial communication in which a stub is minimized, the socket board including a first socket, a second socket, and a third socket,

Receiving signal pin of the first socket and the transmitting / receiving signal pin of the third socket in a first state, and in the second state, a transmitting / receiving signal pin of the first socket and a transmitting / And a switch unit electrically connecting a transmission signal terminal of the third socket and a second transmission signal terminal of the second socket, wherein the first state and the second state are connected to the second socket Wherein the first and second transmission / reception signal pins and the second transmission / reception signal pin are configured to be toggled depending on whether or not a plug that can be inserted is inserted.

In the socket board, a signal line connected to the first transmission / reception signal pin and a signal line connected to the second transmission / reception signal pin are separately formed in a cable connected between the second socket and the slave device.

In the above-described socket board, the slave unit is installed in a unit unit of a motor control board, and the socket board can be installed outside the unit unit.

In the socket board described above, the relay unit electrically connects the daisy chain signal pin of the first socket and the daisy chain signal pin of the third socket in the non-excited state, and in the excited state, A first daisy chain signal pin of the second socket and a daisy chain signal pin of the third socket and a second daisy chain signal pin of the second socket, The chain signal pin and the second daisy chain signal pin are configured separately.

A system for a motor control panel according to an aspect of the present invention is a system for a motor control board installed in a motor control board including a plurality of unit units and a drawing unit,

A plurality of protection control modules respectively installed for the unit units for protection and control of the motors; And an integration module connected to the plurality of protection control modules by serial communication to collect measurement data measured by the protection control module and transmit a control command from the central monitoring room to the protection control module,

A plurality of socket boards are connected in series from the integrated module for the serial communication, and each of the socket boards connects a transmission / reception signal line from the integrated module or the socket board at the front end to a transmission / reception signal line from the socket board at the rear end The first and second transmission and reception signal lines and the second transmission and reception signal line from one of the plurality of protection control modules are connected to a first state and a transmission and reception signal line from the socket module of the integration module or the front end and a transmission and reception signal line from the socket board at the rear end, And a relay unit for switching the second state.

In the above-described motor control system, the relay may be in the non-energized state in the first state and the relay may be in the energized state in the second state.

In the above-described motor control system, power for excitation of the relay unit may be supplied from the protection control module.

In the above motor control system, the daisy chain signal line from the integrated module or the socket board at the front end and the daisy chain signal line from the socket board at the rear end are connected in the non-excitation state, The daisy chain signal line from the socket board of the first socket and the daisy chain signal line from the socket board of the subsequent stage to the first daisy chain signal line and the second daisy chain signal line from one of the plurality of protection control modules, respectively.

According to one aspect of the present invention, since the transmission / reception signal line between the slave device (protection control module) and the socket board does not constitute a stub, the length of the stub is zero when connecting the slave device (protection control module) So that it is possible to realize a serial communication substantially free from the T-branch. In particular, in an application such as a motor control panel, the above-mentioned advantage is doubled considering that the length of the transmission / reception signal line between the slave device (protection control module) and the socket board may be shorter than 1 meter and longer than 3 meters.

According to an aspect of the present invention, a communication line between the socket board and the slave device (protection control module) may be made longer in a network configuration for serial communication, thereby eliminating impedance mismatch or reflection There is an effect that it can be reduced.

Also, according to an aspect of the present invention, even if power supply is interrupted due to a failure of the slave device (protection control module), the relay part becomes non-excitation state and accordingly, the transmission / reception signal pin of the first socket and the transmission / The serial communication between the master device (integrated module) and the other slave device (protection control module) can be normally operated. Therefore, the connection or disconnection of the specific slave device or the power supply failure may occur in other slave devices There is an effect that the communication is not affected.

1 is a diagram showing a schematic configuration of a motor control center (MCC) and a motor control panel system applied thereto (this is a non-disclosure invention of the present applicant).
Fig. 2 shows an example of a T-branch connector having three sockets. Fig. 2 (a) is an external view and Fig. 2 (b) is an internal circuit diagram.
Fig. 3 is a circuit diagram showing an example of a network configuration using a T branch connector. Fig. 3 (a) shows a T branch connector, Fig. 3 (b) .
Fig. 4 is a diagram showing the internal configuration of the socket board 100 for serial communication according to the first embodiment of the present invention. Fig. 4 (a) shows when the relay unit 140 is in an energized state, The portion 140 is in a non-excited state.
5 is a diagram showing that a serial communication network is constructed using the socket board 100 according to the first embodiment of the present invention between the master device 10 and a plurality of slave devices 20. [
6 (a) and 6 (b) illustrate electric connections in a serial communication network using the socket board according to the first embodiment of the present invention. FIG. 6 b) is when the socket board 100 is in the non-excited state.
Fig. 7 is a diagram showing the internal configuration of the socket board 100 for serial communication according to the second embodiment of the present invention. Fig. 4 (a) shows the state when the relay unit 140 is in the excited state, The portion 140 is in a non-excited state.
8 is a view showing an electric circuit when the socket board 200 is in the excited state in the serial communication network to which the socket board 200 for serial communication according to the second embodiment of the present invention is applied.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, parts not related to the description are omitted, and similar names and reference numerals are used for similar parts throughout the specification. The 'serial communication' according to the embodiments of the present invention may be a communication according to a communication standard such as RS-232, RS-422 or RS-485, and RS-485 is preferred.

Fig. 4 is a diagram showing the internal configuration of the socket board 100 for serial communication according to the first embodiment of the present invention. Fig. 4 (a) shows when the relay unit 140 is in an energized state, The portion 140 is in a non-excited state.

5 is a diagram showing that a serial communication network is constructed using the socket board 100 according to the first embodiment of the present invention between the master device 10 and a plurality of slave devices 20. [

For example, the slave device 20 is installed in the unit unit of the motor control panel, and the socket board 100 is installed outside the unit unit.

The socket board 100 may include a first socket 110, a second socket 120, a third socket 130, a relay unit 140 and a wire and a case (not shown) The T branch connector used in the serial communication network of Fig. For example, the first socket 110, the second socket 120, and the third socket 130 are RJ45 sockets.

The first socket 110 and the third socket 130 are used to form a serial communication network by connecting a plurality of socket boards in a chain manner. For example, the first socket 110 may be a socket board at the front stage, A plug attached to the cable for connecting with the master device 10 may be inserted and a plug attached to the cable for connecting the socket socket of the third socket 130 to the socket board of the subsequent stage may be inserted. The second socket 120 may be inserted with a plug attached to a cable for connecting the socket board 100 to the slave device 20.

The first socket 110 and the third socket 130 have transmission and reception signal pins (Ta_1 and Tb_1; Ta_3 and Tb_3) for transmitting and receiving transmission data, respectively. In contrast, the second socket 120 separately includes the first transmission / reception signal pins Ta_2_1 and Tb_2_1 and the second transmission / reception signal pins Ta_2_2 and Tb_2_2, which are used for transmitting and receiving transmission data, respectively. In the second socket 120, the first transmission / reception signal pins Ta_2_1 and Tb_2_1 and the second transmission / reception signal pins Ta_2_2 and Tb_2_2 are configured separately.

The second socket 120 also has power supply pins DC + and DCG used to supply power for controlling the relay unit 140 by using a remaining line not related to communication from the slave device 20 do.

The relay unit 140 includes a first relay 141 and a second relay 142. Although the relay unit 140 is configured using two relays in the figure, . Each of the relays 141 and 142 of the relay unit 140 uses the C contact to adjust the direction of the signal depending on whether it is an energized state or a de-energized state.

When the plug connected to the slave device 20 is inserted into the second socket 120 and the slave device 20 is able to supply power through the plug, the power supply pins DC + and < RTI ID = Power is supplied to each of the relays 141 and 142 of the relay unit 140 through the DCG.

The relay unit 140 electrically connects the transmitting and receiving signal pins Ta_1 and Tb_1 of the first socket 110 to the first transmitting and receiving signal pins Ta_2_1 and Tb_2_1 of the second socket in the energized state, (Ta_3 and Tb_3) of the second socket 120 to the second transmission / reception signal pins (Ta_2_2 and Tb_2_2) of the second socket 120, respectively.

The transmission / reception signal is transmitted through the first socket 110, the relay unit 140, the second socket 120, the slave device 20, the second socket 120, the relay unit 140, and the third socket 130 Or in the opposite direction thereof.

In the cable connected between the second socket 120 and the slave device 20, a signal line connected to the first transmission / reception signal pin of the second socket 120 and a signal line connected to the second transmission / reception signal pin of the second socket 120 And signal lines are separately formed (see Fig. 5). The two signal lines can be connected in parallel at the connection point with the slave device 20 or with the slave device 20. [

When the plug connected to the slave device 20 is disconnected from the second socket 120 or the slave device 20 can not supply the power through the plug, the relay part 140, as shown in FIG. 4 (b) Since the power can not be supplied to the relays 141 and 142 of the relay device.

The relay unit 140 electrically connects the transmitting and receiving signal pins Ta_1 and Tb_1 of the first socket 110 and the transmitting and receiving signal pins Ta_3 and Tb_3 of the third socket 130 directly in the non-excited state.

The transmission / reception signal is transmitted through the first socket 110, the relay unit 140, the third socket 130, or the reverse direction thereof. The transmitting and receiving signal pins of the first socket 110 and the transmitting and receiving signal pins of the third socket 130 are connected to each other through the relay unit 140 without a process of reciprocating between the second socket 120 and the slave device 20 It is connected immediately.

The power for excitation of the relay unit 140 is supplied from the slave device 20 connected to the second socket 120 through the plug so that when the plug is disconnected from the second socket 120, The supply of the power for the exciter of the motor is stopped and immediately becomes non-excited.

For example, if the plug connected to the slave device 20 is separated from the second socket 120 for replacement of the specific slave device 20, the relay part 140 becomes non-excited, The transmission and reception signal pins of the first socket 110 and the transmission and reception signal pins of the third socket 130 are directly connected through the relay unit 140 and the serial communication between the master device 10 and another slave device 20 It can be operated normally.

 In addition, even if the power supply is interrupted due to a failure of the slave device 20, the relay part 140 is in the non-excitation state. Accordingly, the transmission / reception signal pins of the first socket 110 and the transmission / And the serial communication between the master device 10 and another slave device 20 can be normally operated.

According to one aspect of the present invention, there is an effect that connection or disconnection of a specific slave device or abnormality of power supply does not affect communication of another slave device.

6 (a) and 6 (b) illustrate electric connections in a serial communication network using the socket board according to the first embodiment of the present invention. FIG. 6 b) is when the socket board 100 is in the non-excited state.

The transmission and reception signal lines between the slave device 20 and the socket board 100 do not constitute a stub when the socket board 100 is in the excited state and the corresponding slave device 20 is connected to the serial communication network (see FIG. 3A), and the length of the stub is minimized only in the vicinity of the slave device 20, so that serial communication with substantially no T-branching can be realized.

This contrasts with the conventional construction of a stub between the slave device and the T branch connector (see Fig. 3 (b)). Furthermore, in the case of an application such as a motor control panel, the above-mentioned characteristic is more advantageous in consideration of the fact that the length may be 1 meter or longer and 3 meters or more.

According to an aspect of the present invention, a communication line between a connector (a 'socket board') and a slave device may be made long in a network configuration for serial communication, thereby eliminating or reducing impedance mismatch, There is an effect that can be.

The first socket 100 and the third socket 300 may be omitted and the signal line may be directly connected to the relay unit 100. In this case, 140 may be used. In addition, four or more sockets may be formed on the socket board 100. [ When a plurality of slave devices 20 can be connected to one socket board 100, the number of second sockets and relay portions corresponding to the slave devices 20 may be respectively configured.

For example, in order to configure a socket board capable of connecting two slave devices 20, two second sockets (referred to as 'second-1 socket' and 'second-2 socket' respectively) The first relay part is provided between the first socket, the second-1 socket, and the second relay part in the first embodiment (referred to as "first relay part" and "second relay part" And the second relay part performs an operation with a configuration similar to that of the first embodiment described above between the first relay part, the second -2 socket and the third socket.

Also, instead of using a relay for toggling the C contact according to the presence or absence of the power supply as in the first embodiment, a switch for toggling the C contact according to the mechanical force may be used.

The switch unit includes a switch for toggling the contact C according to a mechanical force instead of the relay unit 140 of the first embodiment. And the second state.

For example, the switch of the switch portion can be implemented as a push switch having the C contact, and when the push switch is pushed by the push switch in such a manner that the push switch is engaged with the end or side of the plug insertion portion of the second socket, The first state can be established.

The switch unit electrically connects the transmission / reception signal pin of the first socket with the transmission / reception signal pin of the third socket in the first state, and the transmission / reception signal pin of the first socket and the first transmission / reception signal pin of the second socket, And the transmission / reception signal pin of the third socket is electrically connected to the second transmission / reception signal pin of the second socket.

Fig. 7 is a diagram showing the internal configuration of the socket board 100 for serial communication according to the second embodiment of the present invention. Fig. 7 (a) shows the state when the relay unit 140 is in the excited state, The portion 140 is in a non-excited state. 8 is a view showing an electric circuit when the socket board 200 is in the excited state in the serial communication network to which the socket board 200 for serial communication according to the second embodiment of the present invention is applied.

The description of the same or similar parts as those of the first embodiment of the present invention shown in Fig. 4 will be omitted.

Since the serial communication line is for communication between the master device and each of the slave devices, in principle, communication between the slave devices is impossible. In this embodiment, a signal line other than the transmission / reception signal line is used to perform communication between neighboring slave devices, and such a separate signal line is called a 'daisy chain signal line'.

The socket board 100 for serial communication according to the second embodiment supports a serial communication having a daisy chain signal line, and further includes a daisy chain signal line, and each socket further includes a daisy chain signal pin.

The relay unit 240 uses the third relay 243 to connect the daisy chain signal pin DC_1 of the first socket 210 and the daisy chain signal pin DC_3 of the third socket 230 in the non- The first daisy chain signal pin DC_1 of the first socket 210 and the first daisy chain signal pin DC_2_1 of the second socket 220 are electrically connected to each other in the energized state, The first daisy chain signal pin DC_2_1 and the second daisy chain signal pin DC_2_1 electrically couple the daisy chain signal pin DC_3 to the second daisy chain signal pin DC_2_2 of the second socket 220, Respectively.

When the plug coupled with the cable connected to the slave device 20 is disconnected from the second socket 220 or the supply of the excitation power supplied from the slave device 20 is stopped, the relay part 240 is in the non- Whereby the daisy chain signal is directly coupled from the first socket to the third socket.

When the plug coupled with the cable connected to the slave device 20 is inserted into the second socket 220 and the excitation power is supplied from the slave device 20, the relay part 240 is brought into an excited state, The chain signal is transmitted from the first socket to the slave device via the first daisy chain signal pin of the second socket and the daisy chain signal output from the slave device is transmitted to the third socket through the second daisy chain signal pin of the second socket And may be transmitted in the reverse direction of this path. The signal line connected to the first daisy chain signal pin and the signal line connected to the second daisy chain signal pin in the cable connecting the slave device and the second socket are of course constructed separately.

The daisy chain signal is a signal transmitted between the slave device (or the master device) of the preceding stage and the slave device of the subsequent stage, and the daisy chain signal line is not connected to the slave devices of the whole in parallel. In the interior of the slave device 20, two daisy chain signal lines are separately connected to elements such as a CPU.

The socket boards 100 and 200 according to the first and second embodiments of the present invention can be applied to a motor control panel as shown in Fig. 1 and can be used in place of the aforementioned 'T branch connector'.

A system for a motor control board installed in a motor control board including a plurality of unit units and a lead-in unit includes an integration module, a plurality of protection control modules, and a plurality of socket boards.

The protection control module is installed for each unit for measurement, protection and control of the motor. The integrated module is connected to a plurality of protection control modules by serial communication, and collects and processes measurement data and status information measured by the protection control module And transmits the control command from the central monitoring room to the protection control module. The integration module may be the master device or the master device described above, and the protection control module may be the above slave device or the slave device.

A plurality of socket boards are serially connected from the integrated module for serial communication between the integrated module and each protection control module. The communication cable and the socket board are alternately arranged in a chain manner. In this case, 3 socket is used, and the protection control module is connected from the second socket of each socket board.

The relay part included in each of the socket boards connects the transmission / reception signal line from the integrated module or the socket board at the front end to the transmission / reception signal line from the socket board at the rear end in the non-excitation state, The transmission / reception signal line and the transmission / reception signal line from the rear socket board are connected to the first transmission / reception signal line and the second transmission / reception signal line, respectively, from one of the plurality of protection control modules.

In the non-excitation state, the daisy-chain signal line from the integrated module or the front-end socket board and the daisy-chain signal line from the rear-end socket board are connected. In the excitation state, the daisy-chain signal line from the integration module or the front- And connects the daisy chain signal line from the socket board to the first daisy chain signal line and the second daisy chain signal line from one of the plurality of protection control modules, respectively. And the power for the exciter of the relay part is supplied from the protection control module.

10: master device 20: slave device
110, 210: first socket 120, 220: second socket
130, 230: third socket 140, 240: relay section
141, 141: first relay 142, 242: second relay
243: the third relay

Claims (13)

A socket board comprising a first socket, a second socket, and a third socket,
Receiving signal pin of the first socket and the transmitting / receiving signal pin of the third socket when the first socket is in the non-excited state, and the first transmitting / receiving signal pin of the first socket and the first transmitting / And a relay unit electrically connecting a transmission signal terminal of the third socket and a second transmission signal terminal of the second socket,
Wherein the first transmission / reception signal pin and the second transmission / reception signal pin are configured separately,
Socket board for serial communication with minimized stub. The method according to claim 1,
The power supply for excitation of the relay unit is supplied from a slave device connected to the second socket through a plug so that when the plug is disconnected from the second socket, supply of power for excitation of the relay unit is also stopped, Being a woman,
Socket board for serial communication with minimized stub. A socket board comprising a first socket, a second socket, and a third socket,
Receiving signal pin of the first socket and the transmitting / receiving signal pin of the third socket in a first state, and in the second state, a transmitting / receiving signal pin of the first socket and a transmitting / And a switch unit for electrically connecting a transmission signal terminal of the third socket and a second transmission signal terminal of the second socket,
Wherein the first state and the second state are determined depending on whether or not a plug that can be inserted into the second socket is inserted,
Wherein the first transmission / reception signal pin and the second transmission / reception signal pin are configured separately,
Socket board for serial communication with minimized stub. The method according to claim 1 or 3,
Wherein a signal line connected to the first transmission / reception signal pin and a signal line connected to the second transmission / reception signal pin are separately formed in a cable connected between the second socket and the slave device,
Socket board for serial communication with minimized stub. The method of claim 4,
Wherein the slave device is installed in a unit unit of a motor control board, and the socket board is installed outside the unit unit,
Socket board for serial communication with minimized stub. The method according to claim 1,
The relay unit includes:
Wherein the daisy chain signal pin of the first socket and the daisy chain signal pin of the third socket are electrically connected in the non-excited state, and in the excited state, the daisy chain signal pin of the first socket and the daisy chain signal pin of the second socket 1 daisy chain signal pin and a daisy chain signal pin of the third socket and a second daisy chain signal pin of the second socket,
Wherein the first daisy chain signal pin and the second daisy chain signal pin are separately configured,
Socket board for serial communication with minimized stub. A system for a motor control panel installed in a motor control board including a plurality of unit units and a lead-in unit,
A plurality of protection control modules respectively installed for the unit units for protection and control of the motors;
And an integration module connected to the plurality of protection control modules by serial communication to collect measurement data measured by the protection control module and transmit a control command from the central monitoring room to the protection control module,
A plurality of socket boards are connected in series from the integrated module for the serial communication,
Wherein each of the socket boards comprises:
A first state in which a transmission / reception signal line from the integration module or the socket board at the front end is connected to a transmission / reception signal line from the socket board at the rear end, and a transmission / reception signal line from the socket board at the rear end, And a relay unit for switching a second state of connecting the first and second transmission / reception signal lines and the second transmission / reception signal line from one of the plurality of protection control modules, respectively,
Wherein the motor control unit is a motor control unit. The method of claim 7,
Wherein the first state is a state in which the relay part is in a non-excitation state, and the second state is a state in which the relay is in an excitation state,
System for motor control panel. The method of claim 8,
Wherein a power source for the excitation of the relay unit is supplied from the protection control module,
System for motor control panel. The method of claim 8,
The daisy chain signal line from the integrated module or the socket board at the front end and the daisy chain signal line from the socket board at the rear end are connected in the non-excitation state, and the daisy chain signal line from the integration module or the socket board at the front end, Connecting the daisy chain signal line from the rear socket board to the first daisy chain signal line and the second daisy chain signal line from one of the plurality of protection control modules,
System for motor control panel. The method of claim 3,
Wherein the switch portion is implemented using a push switch having a C contact,
Socket board for serial communication with minimized stub. A system for a motor control panel installed in a motor control board including a plurality of unit units and a lead-in unit,
A plurality of protection control modules respectively installed for the unit units for protection and control of the motors;
And an integration module connected to the plurality of protection control modules by serial communication to collect measurement data measured by the protection control module and transmit a control command from the central monitoring room to the protection control module,
A plurality of socket boards are connected in series from the integrated module for the serial communication,
Wherein each of the socket boards comprises:
A first state in which a transmission / reception signal line from the integration module or the socket board at the front end is connected to a transmission / reception signal line from the socket board at the rear end, and a transmission / reception signal line from the socket board at the rear end, And a switch unit for switching a second state of connecting the first and second transmission / reception signal lines to one of the first and second transmission / reception signal lines from one of the plurality of protection control modules,
Wherein the first state and the second state are determined based on whether or not a plug that can be inserted into the second socket is inserted,
Wherein the motor control unit is a motor control unit. The method of claim 12,
Wherein the switch portion is implemented using a push switch having a C contact,
Wherein the motor control unit is a motor control unit.

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