JP2001177554A - Power line carrier communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power line carrier communication system which can be constructed at low cost and which can simply cope with device extension, shifting, etc., even when many power line carrier communication devices are connected in the building, etc. SOLUTION: This system is provided with a communication frequency setting part which sets the communication frequency band of a signal to be superimposed on a power line 7, and the communication frequency setting part partitions the communication frequency band of the signal in each section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line carrier communication system using a power line carrier communication device for superposing a carrier having a plurality of frequency spectrums on a power line and performing communication control according to a noise environment and an attenuation environment of the power line. About.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram of a lighting control system for a building, for example, shown at the National Convention of the 75th Anniversary of the Illuminating Engineering Institute of Japan in 1991. In this power line carrier communication system, a blocking filter (BF) is connected to each of the 20A branch breakers (BK) for lighting, and signals from other branch breakers are cut off. Thus, the communication system is divided for each branch breaker, and even if many power line carrier communication devices are connected, the maximum traffic is determined by the number of terminals connected to the branch breaker, so that the system can be easily constructed.

[0003]

In the conventional power line carrier communication system as described above, a blocking filter for electrically separating a signal for each branch breaker is required in order to limit the amount of traffic. Since the signals are separated, a gateway between a power line and a dedicated line is required to connect to a higher-level system, and there is a problem that the cost of the system increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even when a large number of power line communication devices are connected in a building or the like, a low-cost system can be provided without installing a blocking filter. An object of the present invention is to provide a power line carrier communication system which can be configured and can easily cope with addition and relocation of devices.

[0005]

A power line carrier communication system according to the present invention includes a communication frequency setting unit for setting a communication frequency band of a signal to be superimposed on a power line. The communication frequency band is classified.

[0006] Further, a switching means for switching a communication frequency range of a signal is provided, and when a signal is transmitted to another section at the time of communication at a predetermined communication frequency in the section, the communication means of the other section is transmitted by the switching means. The signal is switched to a frequency and transmitted.

Further, a common communication frequency setting section for setting a common communication frequency band in which signals can be communicated in all sections is provided, and a communication frequency band of a transmission signal is set by the communication frequency setting section or the common communication frequency setting section. Is what you do.

[0008] Further, the transmission capacity of signals in the communication frequency setting unit and the common communication frequency setting unit is different.

A power line carrier signal frequency for receiving signals of all communication frequencies used for communication between sections, receiving a signal transmitted to another section, and converting the signal to a communication frequency of a destination section. A converter is provided, and the signal converted by the power line carrier signal frequency converter is transmitted with priority over the signal transmitted in each section.

A power line carrier signal frequency converter for mutually converting a communication frequency of a signal used for communication in each section and a communication frequency of a signal commonly used between the sections is provided for each section. It is a thing.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of a power line carrier communication system according to Embodiment 1 of the present invention,
FIG. 2 is a diagram showing frequency bands used for communication on each floor of the power line carrier communication system.

In FIG. 1, reference numeral 1 denotes a power line carrier communication device, which is connected to a plurality of power lines 7 (described later), and performs communication between the power line carrier communication devices. 2 is microcomputer, 3 is QA
M (Quadrature Amplitude Mo)
4) IFFT (Inv)
erse Fast Fourier Transfo
rm).

5 is an upsampling circuit, 6 is a power line coupling circuit, 7 is a power line, 8 is a downsampling circuit,
9 is FFT (Fast Fourier Transf)
orm), 10 is a QAM decoder, and 11 is a switch including a dip switch, a rotary switch, and the like. The upsampling circuit 5 and the downsampling circuit 9 represent a communication frequency setting unit.

Next, the operation will be described. First, regarding the transmission operation, the signal input from the microcomputer 2 is subjected to QAM
The encoder 3 performs QAM modulation. The QAM-modulated signal is subjected to inverse Fourier transform by IFFT4, and the frequency axis data is converted to time axis data. This time-axis data is up-sampled by the up-sampling circuit 5, the communication frequency is increased by n times as compared with normal sampling, and the data is converted from parallel to serial to time-axis data. After that, 10 KHz to
A 450 KHz power line carrier signal is superimposed on the power line 7.

In the receiving operation, the data superimposed on the power line 7 is received as a time-axis waveform by the power line coupling circuit 6, serial-parallel converted by the down-sampling circuit 8, and the parallel data is down-sampled by a factor of 1 / n. I do. Thereby, the sampling frequency of the data to be transmitted matches the sampling frequency of the data to be received. This data is converted into data on the frequency axis by the FFT 9, and the signal is demodulated by the QAM decoder 10.

Next, communication between a plurality of power line carrier communication devices will be described. Transmission data is sent from microcomputer 2 to QAM
When a signal is input to the encoder 3 and transmitted with a synchronization code included therein, as a result of detecting the received data by the FFT 9, a carrier exists when the data matches the synchronization code in the power line carrier communication device 1. If they do not match, there is no carrier. Therefore, in the data reception from the power line 7, if the synchronization code matches, the microcomputer 2 performs data reception, but if not, the data reception is not performed.

Further, at the time of transmission, transmission is started after confirming whether or not this carrier is detected. Therefore, transmission cannot be performed during detection of the carrier. Further, by operating the switch 11 to set the multiple of the up-sampling and the multiple of the down-sampling, the frequency for outputting the signal can be changed to a specific frequency.

Using this, the communication frequency band used for each floor in the building is changed and divided. For example, the fourth floor (hereinafter, referred to as 4F) has n = 1 (A in FIG. 2), the third floor (hereinafter, referred to as 3F) has n = 2 (B in FIG. 2), and the second floor (hereinafter, referred to as 4F).
2F) n = 3 (C in FIG. 2), the first floor (hereinafter referred to as 1F) is n = 4 (D in FIG. 2), and a communication frequency band is set for each floor as shown in FIG. , Communication can be performed on the same floor, and communication cannot be performed between different floors. As a result, for example, the 4F carrier is not detected on the 3F, so that the 4F communication is not waited for even if the 3F communication is performed.

Therefore, when configuring a power line carrier communication system, if the number of terminals (power line carrier communication devices) that can be installed is determined within one communication frequency by roughly estimating the traffic amount for each system, blocking will occur. The system can be added or deleted without interrupting the signal with a filter or the like.

In this embodiment, the communication frequency is set for each floor of the building in this embodiment. However, the communication frequency may be set in a fixed unit on the same floor of the building. Can be set freely. In addition, the unit of division in which the communication frequency is set may be a unit for each equipment system such as an air conditioning system and a lighting system controlled by power line transport. Further, a different communication frequency allocation may be assigned to each manufacturer, and a section may be provided so that products of the same manufacturer can be controlled and products of different manufacturers cannot be controlled.

Embodiment 2 FIG. FIG. 3 is a configuration diagram of a power line carrier communication system according to Embodiment 2 of the present invention, and FIG. 4 is a diagram showing a communication procedure of the power line carrier communication system.
In the figure, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. 1a is a power line carrier communication device installed on the fourth floor in a building, for example, provided inside a warning device, and 1b is a power line carrier communication device installed on the first floor in a building, provided inside a warning device. , Microcomputer 1
Has a function of setting the transmission frequency of the up-sampling circuit 5 and the down-sampling circuit 8,
Switching means.

Next, the operation will be described. For example, 4
A case will be described in which a report from the alarm device of F is also notified to the alarm device on 1F. First, in the 4F power line carrier communication device 1a, the alarm data transmitted from the input ports 1 to 3 of the microcomputer 2 is transmitted to the switch 1 in the same manner as in the first embodiment.
1, the communication frequency is set to 4F, for example, A in FIG. On the other hand, the data input from the input port 4 is set and transmitted by the microcomputer 1 by switching to the communication frequency of 1F, for example, D in FIG. Here, the transmission data includes the current setting information of the communication frequency by the switch 11.

Next, in the power line carrier communication device 1b on the first floor, for example, only the communication frequency of D in FIG. 2 can be received, and when data at the communication frequency is received from the power line 7, the reception is completed based on the content of the received data. If it is necessary to return a response or the like, the transmission frequency is changed from the output port 2 to the communication frequency specified by the switch 11 on the transmission side based on the setting information in the data, and a reception completion (ACK) frame is transmitted.
It transmits including the communication frequency set by itself. In addition,
When data is transmitted from the output port 2, it is assumed that the data is transmitted while being set to a normal communication frequency of the power line communication device 1B, for example, D in FIG.

When it is not necessary to return an ACK frame, there is no need to transmit a transmission frame including its own set communication frequency. Except for the above-described operation in data transmission and reception, the operation is the same as that of the first embodiment, and the description is omitted.

As described above, in the first embodiment, for example, communication cannot be performed from the 4F power line carrier communication device to the 3F power line carrier communication device. However, as shown in the second embodiment, the communication frequency of the microcomputer 2 or the like is changed. By specifying from the application program, it is possible to communicate with the power line carrier communication device 1 set to another communication frequency.

Embodiment 3 FIG. FIG. 5 is a configuration diagram of a power line carrier communication system according to Embodiment 3 of the present invention. In the figure, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. 12a is a common communication frequency section for setting and outputting data from the IFFT 4 to a communication frequency that can be commonly communicated with all terminals (power line communication device), and 12b is for transmitting data of a communication frequency common to all terminals from the power line coupling circuit 6. This is a common communication frequency section that receives and outputs to the FFT 9. When outputting data to the power line coupling circuit 6, the microcomputer 1 has a function of switching to a communication frequency exclusively used by its own terminal by the upsampling circuit 5 or a common communication frequency by the common communication frequency unit 12a as necessary. Have. The common communication frequency section 12a and the common communication frequency section 12b indicate a common communication frequency setting section.

Next, the operation will be described. As for the transmission operation, the time axis data by the IFFT 4 is up-sampled by the up-sampling circuit 5 to a frequency exclusively used by the own terminal, and the common communication frequency unit 12a performs common communication with all terminals (power line carrier communication device). The communication frequency is set to be possible. When the microcomputer 1 communicates with, for example, the power line communication device 1 in the same section, the microcomputer 1 outputs data based on the communication frequency of the upsampling circuit 5 to the power line coupling circuit 6.
Further, when communicating with the power line carrier communication device 1 in all the sections, the data based on the common communication frequency by the common communication frequency unit 12a is output to the power line coupling circuit 6. Here, the transmitting side switches communication between a certain section and communication with another section in response to a request from an application and transmits the communication. As a method, as shown in FIG. 5, by providing a filter circuit in the transmission output stage, the frequency may be switched between inside and outside the section, or the frequency output by IFFT4 may be switched.

With respect to the receiving operation, the frequency data of both the frequency of the up-sampling circuit 5 and the common communication frequency of the common communication frequency section 12a can be received via the power line coupling circuit 6, for example, the power line carrier communication within the same section. When data is received from the device 1, the sampling frequency is matched by the downsampling circuit 8, so that the microcomputer 2 receives data. Also,
When data using the common communication frequency is received from the power line carrier communication device 1 in another section, the common communication frequency unit 12
b, and the microcomputer 2 performs data reception. Except for the above-described operation in data transmission and reception, the operation is the same as that of the first embodiment, and the description is omitted.

As described above, communication within a fixed section is performed at the up-sampled frequency, and communication is performed with all sections at the common communication frequency, so that the frequency used in the communication destination section is unknown. Can also be transmitted. Further, since the common communication frequency and the frequency in the section are not transmitted at the same time, traffic can be reduced.

Embodiment 4 FIG. 6 is a configuration diagram of a power line carrier communication system according to Embodiment 4 of the present invention. In the figure, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. 13a is a transmission frequency section for setting a communication frequency of transmission data to the power line 7,
Data is set to four communication frequencies A, B, C, and D.
A reception frequency unit 13b receives data from the power line 7, and receives data of four communication frequencies A, B, C, and D set by the transmission frequency unit 13a.

Next, the operation will be described. First, in the third embodiment, if the frequency at which one terminal (power line carrier communication device) communicates with a terminal in a section is the same as the frequency of transmission to a terminal outside the section, the occupation ratio of the communication path to the outside of the section Therefore, the probability of waiting for transmission outside the section increases. Therefore, it is necessary to increase the speed of transmission outside the section. Therefore, in the present embodiment, for example, the transmission frequency unit 13a assigns three communication frequencies A, B, and C to a common communication frequency, and assigns one bit to each of the communication frequencies to transmit. The frequency is sequentially switched by 2 and output to the power line 7. Note that one of the communication frequencies D is used for transmission in the section.

At the time of reception, the data of the common communication frequencies A, B, and C from outside the section are received by the reception frequency section 13b. Thereby, the communication speed at the common communication frequency to the outside of the section is three times as high as the transmission rate of the signal inside the section (for example, 30 kb / s).

Contrary to the above, when the frequency of communication within a certain section is high and the frequency of transmission outside the section is low, the higher the intra-section communication speed, the shorter the transmission waiting time. Therefore, three communication frequencies A, B, and C are used for signal transmission in the section, and one of the remaining communication frequencies D is allocated to transmission outside the section. Thereby, the intra-partition communication can be performed at high speed. Except for the above-described operation in data transmission and reception, the operation is the same as that of the first embodiment, and the description is omitted.

As described above, in a device having a communication frequency for high-speed data communication and a communication frequency for low-speed data transmission and transmitting long data or transmitting data at a high frequency,
Since a plurality of communication frequencies are used and signals are carried in parallel at each communication frequency, it is possible to improve the response of the entire system.

Embodiment 5 FIG. FIG. 7 is a diagram showing a frequency band used for communication of the power line carrier communication system according to the fifth embodiment of the present invention, and FIG. 8 is a diagram showing a time chart of a transmission frame of the power line carrier communication system. FIG. 1 is used for the configuration diagram of the power line carrier communication system.
In the figure, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. A power line router 14 is provided on the power line 7 and indicates a power line carrier signal frequency conversion unit according to claim 5, which converts a communication frequency of data transmitted from one section to another section.

Next, the operation will be described. The transmission / reception operation in each power line carrier communication device 1 is the same as that in the first embodiment, and a description thereof will be omitted, and communication between different sections by conversion of the communication frequency of the power line router 14 will be described.

For example, as shown in FIG. 7, in a power line carrier communication system composed of three sections, a communication frequency C is used for communication of each power line carrier communication device 1 in the section 1.
Similarly, the communication frequency B is used in the section 2 and the communication frequency D is used in the section 3. Therefore, when data is transmitted from the section 1 to the section 2, the section 1 cannot communicate with the section 2 as it is because the section 1 is communicating data at the communication frequency C. For this reason, the frequency used in each section is mutually converted by the power line router 14.

That is, the power line communication device 1 of the section 1
Designates a destination (section 2) in a frame of data to be transmitted to section 2 and outputs it to power line 7. Power line router 1
4 receives data on the power line 7 from the power line carrier communication device 1 in the section 1, determines the frequency (B) of the received data based on the destination (section 2) of the received data, and determines the communication frequency of the section 2. B and output to the power line 7. Thereby, the power line communication device 1 in the section 2 receives data from the power line communication device 1 in the section 1. The communication between the other sections is performed in the same manner as described above. The communication frequency used in each section is set in the power line router 14 in advance.

In each section, the transmission from the power line router 14 is set to be performed with priority over the communication in the section, and the power line carrier communication device 1 in the section 2 transmits the data frequency-converted from the power line router 14. Receive preferentially.

To set the transmission from the power line router 14 to be given priority over the communication in the section, for example,
As illustrated in FIG. 8A, when the terminal (the power line carrier communication device 1) in the section 2 detects the frame of the communication frequency B, after detecting the end of the frame, after a predetermined time (for example, after 40 ms) ) To send data.

On the other hand, in the power line router 14, FIG.
As shown in (b), the transmission of the data corresponding to the communication frequency B of the section 2 is shorter than the predetermined time (for example, 3 seconds).
0 ms later), so that the frame (data) of the terminal in the normal section 2 is transmitted.
The frame (data) from the power line router 14 can be transmitted preferentially, and can be transmitted preferentially. The power line carrier communication device 1 in the section 2 gives priority to the data whose frequency has been converted from the power line router 14. Can be received.

In this embodiment, a case has been described in which data is transmitted from the power line communication device 1 in the section 1 to the power line communication device 1 in the section 2. However, data communication between other sections is similarly performed. Needless to say,

As described above, the power line router 14 receives all communication frequencies used for communication in the entire system, determines the destination of data, converts the communication frequency to the address of the corresponding destination, and Since the frame transmission interval of the transmission frame (the time from the detection of the end of transmission of the frame to the transmission of the next frame) is shorter than the transmission suspension time of the other terminals, the signal of the power line router 14 is processed preferentially. This makes it possible to always build a higher-level system in each section regardless of the traffic situation.

Embodiment 6 FIG. FIG. 9 is a diagram showing a frequency band used for communication by the power line carrier communication system according to the sixth embodiment of the present invention. FIG. 1 is used for the configuration diagram of the power line carrier communication system. In the figure, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. A power line router 15a, 15b, 15c is provided on the power line 7 for each section, and is a power line router showing the power line carrier signal frequency conversion unit according to claim 6, wherein the communication frequency of data is set to an individual frequency used for data of each section and the power line 7 Interconverts to the frequencies commonly used above.

Next, the operation will be described. The transmission and reception operations in each power line carrier communication device 1 are the same as those in the first embodiment, and thus description thereof will be omitted, and communication between different sections by conversion of the communication frequency of the power line routers 15a, 15b, and 15c will be described.

For example, as shown in FIG. 9, in a system composed of three sections, a communication frequency C is used for communication of each power line carrier communication device 1 in the section 1, and a communication frequency B is similarly used in the section 2. In the section 3, the communication frequency D is used. Further, a power line router 15 for mutually converting a specific communication frequency and a common communication frequency used on the power line 7 is provided in each section. In this embodiment, the power line router 15a installed in the section 1 mutually converts data into a communication frequency C used for communication in the section 1 and a common communication frequency E used commonly on the power line 7. .

Similarly, the power line router 15b mutually converts the communication frequency b in the section 2 into the frequency of the common communication frequency E, and the power line router 15c converts the communication frequency c in the section 3 into the frequency of the common communication frequency E. Convert. In this way, by setting a common communication frequency with the communication frequency in each section, for example, the communication frequency in the floor direction (vertical direction) of the building is made common as E, and the communication frequency for each floor (each section) is individually set. This facilitates the separation of communications.

Therefore, for example, from the power line carrier communication device 1 at the address 1 of the section 1 (building 3F) to the section 3 (building 1F).
When data is transmitted to the power line carrier communication device 1 at address 2 in F), “address 2 of block 3” is described as the destination in the transmission frame from the power line carrier communication device 1 at address 1 of block 1. When the power line router 15a of the section 1 receives this frame, the communication frequency is changed from C to E.
To the power line router 15C in the section 3
To the address 2 "is added to the previous data and transmitted.

When the power line router 15c of the section 3 receives this frame, the communication frequency is converted from E to D, data is transmitted to the power line carrier communication device 1 of the address 2 of the section 3, and the power line of the address 2 of the section 3 is transmitted. The carrier communication device 1 receives the communication frequency D-converted data.

In this embodiment, a case has been described in which data is transmitted from the power line carrier communication apparatus 1 at address 1 in section 1 to the power line carrier communication apparatus 1 at address 2 in section 3. It goes without saying that data communication is performed similarly, for example, communication between each floor of a building is performed.

[0051]

Since the present invention is configured as described above, it has the following effects. A communication frequency setting unit that sets a communication frequency band of a signal to be superimposed on the power line; and the communication frequency setting unit divides a communication frequency band of the signal for each section, so that the communication frequency band is divided from a plurality of communication frequency sets. Communication is performed between power line carrier communication devices in the same section using a set of communication frequencies not used in the same section, application, etc., which may affect the amount of communication traffic used in other sections, applications, etc. Without providing, it becomes possible to add a system such as a new power line carrier communication device.

Further, when a signal is transmitted to another section at the time of communication at a predetermined communication frequency in a section, a switching section for switching the communication frequency range of the signal is provided. Since the signal is switched and transmitted, communication between the newly added system and the existing system becomes possible, and communication between distributed systems becomes possible.

Furthermore, a common communication frequency setting section for setting a common communication frequency band in which signals can be communicated in all sections is provided, and the communication frequency band of the transmission signal is set by the communication frequency setting section or the common communication frequency setting section. By simply switching to a common communication frequency without changing the communication frequency, it is possible to communicate with a system in another section, and to communicate without knowing the communication frequency in another section.

Further, since the transmission capacity of signals in the communication frequency setting section and the common communication frequency setting section is different, it is possible to have a communication frequency for high-speed data communication and a communication frequency for low-speed data transmission. Response can be improved.

A power line carrier signal frequency for receiving signals of all communication frequencies used for communication between sections, receiving a signal transmitted to another section, and converting the signal to a communication frequency of a destination section. Since the signal provided by the power line carrier signal frequency conversion unit is transmitted with priority over the signal transmitted in each section, the signal converted by the power line carrier signal frequency conversion unit is preferentially processed. Therefore, a higher-level system can always be constructed in each section regardless of the traffic situation.

Each of the sections is provided with a power line carrier signal frequency converter for mutually converting a communication frequency of a signal used for communication in each section and a communication frequency of a signal commonly used between the sections. Therefore, the communication frequency to convert each other is 1
Since a pair can be used, an inexpensive power line carrier signal frequency conversion unit can be constructed, and the transmission line length can be increased, and the power line carrier signal can be installed in an arrangement where the signal is not attenuated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power line carrier communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a communication frequency band of the power line carrier communication system according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a power line carrier communication system according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a communication procedure of a power line carrier communication system according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a power line carrier communication system according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a power line carrier communication system according to a fourth embodiment of the present invention.

FIG. 7 is a diagram illustrating a communication frequency band of a power line carrier communication system according to a fifth embodiment of the present invention.

FIG. 8 is a diagram showing a time chart of a transmission frame of the power line communication system according to the fifth embodiment of the present invention.

FIG. 9 is a diagram illustrating a communication frequency band of a power line carrier communication system according to Embodiment 6 of the present invention.

FIG. 10 is a configuration diagram of a conventional power line carrier communication system.

[Explanation of symbols]

1 power line carrier communication device, 2 microcomputer, 3 encoder, 4 IFFT, 5 up sampling circuit, 6 power line coupling circuit, 7 power line, 8 down sampling circuit, 9 FFT, 10 QAM decoder, 11 switch, 12a common communication frequency section,
12b common communication frequency part, 13a transmission frequency part, 13b reception frequency part, 14 power line router, 15a power line router, 15b power line router, 15c power line router.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshiro Ito 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Hideki Takahara 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 F term in Ryo Denki Co., Ltd. (reference) 5K033 AA09 CA17 CB01 CB03 CB08 DA05 DB01 DB09 DB18 DB23 EC02 EC03 5K046 AA03 BA02 PP01 PP05 PP08 PS03 PS48 PS51

Claims (6)

[Claims] 1. A power line carrier communication device is provided for each section,
A power line carrier communication system that superimposes a signal of a predetermined communication frequency on a power line and performs communication between the power line carrier communication devices, comprising: a communication frequency setting unit configured to set a communication frequency band of a signal to be superimposed on the power line; A power line carrier communication system, wherein a communication frequency band of a signal is divided for each section by a frequency setting unit. And a switching unit for switching a communication frequency range of a signal. When a signal is transmitted to another partition during communication at a predetermined communication frequency in the partition, communication of another partition is performed by the switching unit. The power line carrier communication system according to claim 1, wherein the signal is switched to a frequency and transmitted. 3. A communication frequency setting unit for setting a common communication frequency band in which signals can be communicated in all sections, wherein a communication frequency band of a transmission signal is set by the communication frequency setting unit or the common communication frequency setting unit. The power line carrier communication system according to claim 1, wherein 4. The power line communication system according to claim 3, wherein the communication frequency setting unit and the common communication frequency setting unit have different signal transmission capacities. 5. A power line carrier signal frequency for receiving signals of all communication frequencies used for communication between sections, receiving a signal transmitted to another section, and converting to a communication frequency of a destination section. The power line carrier communication system according to claim 1, further comprising a conversion unit, wherein the signal converted by the power line carrier signal frequency conversion unit is transmitted with higher priority than the signal transmitted in each section. 6. A power line carrier signal frequency converter for mutually converting a communication frequency of a signal used for communication in each section and a communication frequency of a signal commonly used between the sections for each section. The power line carrier communication system according to claim 1, wherein: