JP2008227561A - Plc-compatible intelligent outlet system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically confirm a position of information terminal equipment, and to quickly cope with a network fault in a system utilizing a PLC-compatible intelligent outlet. <P>SOLUTION: In the system in which a plurality of PLC router outlets, a monitoring server and a PLC router outlet modem for Internet connection are connected to a power line, each PLC router outlet is provided with a DHCP server means, and an independent sub network is constituted and managed for each PLC router outlet. The monitoring server is provided with a means for monitoring the network traffic of the power line and detecting a PLC information terminal where an abnormality has occurred and a means for transmitting disconnection signals to the PLC router outlet to which the PLC information terminal where the abnormality has occurred is connected. Also, the PCL router outlet is provided with a connection switch for controlling communication signals, and the connection switch is interrupted when receiving the disconnection signals from the monitoring server. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an intelligent outlet utilizing high-speed power line communication (PLC), and more particularly to a system and method for collecting and analyzing information transmitted from a device connected to a PLC network to transmit network control and management information. .

  In October 2006, the Ministry of Internal Affairs and Communications revised the ministerial ordinance to allow domestic use of high-speed power line communications only indoors, so that full-scale use of PLCs started indoors, and once installed, there was little change. A technology that utilizes the location information of the outlet is expected.

  Currently, as a method for specifying the position of a device connected to a network in a building, an IP address is assigned in advance to a device connected to the network, and this IP address and the physical location information of the device are recorded artificially. There is a way.

  However, in this artificial method, it is necessary to change the IP address and to correct the recorded physical position information of the device every time the device is moved due to floor movement or the like, which requires management man-hours. Also, when an IP address is automatically assigned to a device connected to the network, it is necessary to artificially check the IP address assigned to the device in order to grasp where each device exists in the network. It will hang. Furthermore, when grasping the position of the apparatus for each network switch such as a hub, it is necessary to artificially confirm the physical position information. For this reason, it has been difficult to realize a service that effectively uses position information of information terminals and sensors connected to the network.

  In addition, when a terminal device connected to the network is infected with a computer virus and discharges a large amount of packets (packet flood), there is a problem that network traffic is compressed and other terminal devices cannot communicate. For this reason, it is necessary to quickly disconnect the terminal device infected with the virus from the network, but it cannot be quickly handled by an artificial method, and it takes time to recover.

On the other hand, there has been proposed a position information specifying system that communicates an outlet with a communication function and a wireless sensor attached to a moving body to acquire position information of the moving body (Patent Document 1). In addition, a system has been proposed in which a wireless communication device is connected to an outlet and the position information of the moving body is confirmed by communicating the wireless tag attached to the moving body with the communication device (Patent Document 2).
JP 2006-245983 A JP 2006-311275 A

  However, in these systems, it is necessary to attach a wireless sensor or the like capable of wireless communication with the outlet to the mobile body, and to supply constant power to the wireless sensor or the like. In addition, when such a system is applied to an elderly monitoring system, users in remote locations must always monitor and cannot respond quickly when an emergency occurs while monitoring is interrupted. There is a fear. Further, in such a system, only the position of the sensor is specified, and a human must judge the behavior of the elderly person based on information sent from the sensor.

  One of the objects of the present invention is to automatically confirm the position of an information terminal device in a system using a PLC-compatible intelligent outlet, and to respond quickly when a failure occurs in the network. Another object of the present invention is to make it possible to quickly cope with unforeseen situations by applying the present system to an elderly monitoring system.

According to the present invention, a plurality of PLC router outlets, a monitoring server, and a PLC router outlet modem for connecting to the Internet are connected to a power line, and information transmitted from a device connected to each PLC router outlet is monitored. In a system that controls the network formed by power lines and notifies users,
Each PLC router outlet comprises DHCP server means for managing IP addresses that can be distributed within the sub-network, and an independent sub-network is configured and managed for each PLC router outlet.

The monitoring server monitors the network traffic of the power line and detects an abnormality of the PLC information terminal connected to the PLC router outlet, and the PLC router to which the PLC information terminal in which the abnormality has occurred is connected Means for transmitting a disconnect signal to the outlet,
The PLC router outlet is separated by a PLC modem for power line connection that separates communication signals from current, a connection switch that controls the communication signals separated according to a control signal transmitted from the monitoring server, and the PLC modem. A subnet PLC router that communicates with a device connected to the PLC router outlet by superimposing the generated communication signal and current, and disconnecting the connection switch when a disconnection signal is received from the monitoring server desirable.

  The monitoring server further includes a storage area storing a user identification information database in which a mail address of a user of the PLC information terminal connected to the PLC router outlet is registered, and use of the PLC information terminal in which the abnormality has occurred. It is desirable to provide a means for notifying the person's mail address of the occurrence of an abnormality.

  In addition, the monitoring server includes one or more PLC human sensors connected to the PLC router outlet, and the monitoring server stores a predetermined condition regarding the order of detection by each PLC human sensor and / or its interval. It is preferable to determine that an emergency has occurred and to perform a preset emergency notification process when the detection order and / or interval of detection by each PLC human sensor is out of the above conditions.

  Further, the monitoring server stores a detection information log in which the position and date / time of detection by each PLC human sensor is recorded, and refers to the log periodically, and at least one within a predetermined period. When the PLC human sensor is detected a predetermined number of times in a specific order, it is desirable to include condition acquisition means for grasping the information as a daily action and recording it as a new condition.

In the present invention, at least a plurality of PLC router outlets, a monitoring server, and a PLC router outlet modem for connecting to the Internet are connected to a power line, and information transmitted from a device connected to each PLC router outlet is monitored. In the method of controlling the network formed by the power line and notifying the user,
Each PLC router outlet comprises DHCP server means for managing IP addresses that can be distributed within the sub-network, and an independent sub-network is configured and managed for each PLC router outlet.

The monitoring server monitors the network traffic of the power line to detect a PLC information terminal in which an abnormality has occurred, and transmits a disconnection signal to a PLC router outlet connected to the PLC information terminal in which the abnormality has occurred. ,
The PLC router outlet is separated by a PLC modem for power line connection that separates communication signals from current, a connection switch that controls the communication signals separated according to a control signal transmitted from the monitoring server, and the PLC modem. A subnet PLC router that communicates with a device connected to the PLC router outlet by superimposing the generated communication signal and current, and disconnecting the connection switch when a disconnection signal is received from the monitoring server desirable.

  The monitoring server further includes a storage area for storing a user identification information database in which a mail address of a user of a PLC information terminal connected to the PLC router outlet is registered, and the PLC information in which the abnormality has occurred. It is desirable to notify the occurrence of an abnormality to the email address of the user of the terminal.

  In addition, a PLC human sensor connected to the PLC router outlet is provided, and the monitoring server includes a storage area in which predetermined conditions regarding the order of detection and / or the interval between the PLC human sensors are registered. It is desirable to determine that an emergency has occurred when the order of detection by each PLC human sensor and / or its interval deviates from the above conditions, and to execute a preset emergency notification process.

  In addition, the monitoring server accumulates a detection information log in which the position and date / time of detection by each PLC human sensor is recorded, and refers to the log periodically, so that one or more of the PLCs within a predetermined period. When the human sensor is detected a predetermined number of times in a specific order, it is desirable to extract the information as daily behavior and record it in the storage area.

  In the PLC-compatible intelligent outlet system according to the present invention, each PLC router outlet configures and manages a subnetwork for each outlet. Therefore, once installed, the position of the information terminal can be grasped in units of outlets that are hardly moved or added. it can. Further, since information terminal devices, sensors, and the like are managed by IP addresses automatically distributed by the PLC router outlet, it is not necessary to artificially change the IP address even if these devices are moved. Also, by associating these IP addresses with physical locations, the location can be automatically managed by the monitoring server, eliminating the need to manage information manually.

  In the PLC-compatible intelligent outlet system of the present invention, the monitoring server detects an abnormality in the PLC information terminal connected to the PLC router outlet, and transmits a disconnect signal to the PLC router outlet to shut off the connection switch. The generated PLC information terminal can be quickly disconnected from the network, minimizing damage and enabling quick recovery.

  In the PLC-compatible intelligent outlet system according to the present invention, the monitoring server includes means for notifying the occurrence of an abnormality to the mail address of the user of the PLC information terminal in which the abnormality has occurred, so that the user of the PLC information terminal in which the abnormality has occurred is provided. Can be notified and can respond promptly.

  In the PLC-compatible intelligent outlet system of the present invention, the PLC human sensor is provided, and the monitoring server manages the conditions of detection by the PLC human sensor, for example, when the monitored person takes an action different from the daily life. Can respond quickly.

  In the PLC-compatible intelligent outlet system of the present invention, when the PLC human sensor is detected a predetermined number of times in a specific order within a predetermined period, the monitoring server grasps the information as a daily action, and a new condition As a result, it is possible to perform crisis management in accordance with the actual behavior of the monitored person.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing the overall configuration of a system using a PLC-compatible intelligent outlet according to the present invention. In the embodiment of the PLC-compatible intelligent outlet system shown in the figure, a plurality of PLC router outlets 10, a monitoring server 20, and a PLC modem 30 for connecting to the Internet are connected to each other via a power line 100 laid around the building. Has been. These are also connected to the Internet via a PLC modem 30 for Internet connection. The PLC information terminal 40 is connected to the PLC router outlet 10.

  The PLC router outlet 10 is designed according to the shape of the outlet box and is installed in a building. FIG. 2 shows a functional concept of the PLC router outlet 10. As shown in the figure, the PLC router outlet 10 includes a PLC modem 101 for power line connection, a connection switch 102, and a subnet PLC router 103 including a DHCP server 104.

  The power line connecting PLC modem 101 is means for communicating with other PLC router outlets, the Internet connecting PLC modem 30 and the monitoring server 20 via the power line 100 and separating the communication signal from the current. The connection switch 102 is means for controlling the separated communication signal by the control signal transmitted from the monitoring server 20.

  The subnet PLC router 103 is a means for superimposing the communication signal and current separated by the power line connection PLC modem 101 and communicating with the PLC information terminal 40. The subnet PLC router 103 is means for configuring and managing an independent subnetwork for each PLC router outlet.

  The subnet PLC router 103 also incorporates a DHCP server 104. The DHCP server 104 is means for managing IP addresses that can be distributed within the sub-network. When the subnet PLC router 103 detects that the PLC information terminal 40 is connected, the DHCP server 104 assigns an IP address to each device. When the subnet PLC router 103 detects that these devices have been removed, the DHCP server 104 collects the assigned IP address and manages it as a redistributable IP address.

  The subnet PLC router 103 is also connected to another PLC router outlet, another PLC information terminal connected to the PLC router outlet, the PLC modem 30 for Internet connection, the monitoring server 20, and the PLC router outlet 10. A routing table for communicating with the existing PLC information terminal 40 is constructed and managed, and communication between these devices is provided.

  The monitoring server 20 is a monitoring server that records communication data of the PLC information terminal and monitors network traffic in the power line 100. FIG. 3 is a diagram showing a schematic configuration of the monitoring server 20. As shown in FIG. 3, the monitoring server 20 includes a traffic monitoring unit 201, a control unit 202, a mail transmission unit 203, a user identification information database 204, and a communication data log 205.

  The traffic monitoring unit 201 is a program module that monitors network traffic and stores communication data on the network in the communication data log 205. The control unit 202 is a means for controlling the overall operation of the monitoring server 20, and operates with a program (not shown) that realizes operations described in detail below. The mail transmission unit 203 is a program module that notifies the user of an information terminal infected with a virus of an error by e-mail or a message. The user identification information database 204 is a database that manages identification information of users of PLC information terminals, and is stored in a fixed disk (HDD) in the monitoring server 20 or the like. In this database 204, at least the device identification information such as the MAC address and the user identification information such as the mail address of the user of the PLC information terminal are registered in advance by the administrator for each PLC information terminal. The communication data log 205 is a log for recording information communicated by the PLC information terminal, and is stored in a fixed disk (HDD) in the monitoring server 20 or the like. The communication data log 205 stores the communication data of the PLC information terminal, the IP address of the PLC information terminal, time information, and the like for each PLC information terminal.

  The PLC modem 30 for Internet connection is means for connecting the network constituted by the present embodiment to the Internet via a modem or a router by FTTH / ADSL communication or other communication methods.

  Next, the operation of the system according to this embodiment when a packet flood occurs will be described with reference to FIG. As a premise, when a PLC information terminal is connected to one of the PLC router outlets 10, the DHCP server 104 obtains device specifying information such as a MAC address, and assigns an IP address to the monitoring server 20. Notice. The monitoring server 20 identifies user information from the device identification information and manages it together with the IP address. When a packet flood occurs and a large number of packets occupy the network bandwidth, the monitoring server 20 detects the packet flood by the traffic monitoring unit 201. The monitoring server 20 refers to the information stored in the communication data log 205, identifies the IP address of the PLC information terminal that is transmitting a large amount of packets (step A1), and uses this IP address to identify the user identification information database 204. The user of the PLC information terminal is identified with reference to the above, and an error is notified from the mail transmission unit 203 to the user terminal by mail (step A2). In this case, the mail address of the mobile phone may be registered as user information, and the mail may be transmitted via the external Internet. Thereafter, the monitoring server 20 specifies the PLC router outlet 10 to which the PLC information terminal is connected by an IP address, and transmits a disconnection signal to the PLC router outlet 10 (step A3). The PLC router outlet 10 that has received the disconnection signal turns off the connection switch 102 and disconnects the signal path (step A4). Thereby, it is possible to automatically disconnect the PLC information terminal causing the packet flood from the network.

  The PLC router outlet of this embodiment includes one connection switch 102, but an independent connection switch may be provided for each insertion port of the PLC router outlet.

  In the embodiment of the present invention, a packet flood is assumed as a network abnormality. However, other network problems such as transmission of virus mail may be used.

  The system according to the present invention can be applied to monitoring the lives of elderly people living alone. The system includes a PLC human sensor 50 connected to the PLC router outlet, and the monitoring server 20 ′ is registered with predetermined conditions regarding the order of detection by each PLC human sensor and / or its interval. A storage area is provided, and it is determined that an emergency has occurred when the order of detection by each PLC human sensor and / or its interval is outside the above conditions, and a preset emergency notification process is executed.

  In addition, the monitoring server 20 ′ refers to a storage area for storing a detection information log in which the position and date / time of detection by each PLC human sensor is recorded, and periodically refers to the log within a predetermined period. When one or more PLC human sensors are detected a predetermined number of times in a specific order, the information processing apparatus includes condition acquisition means for grasping the information as a daily action and recording it as a new condition.

  Hereinafter, this embodiment will be described in detail with reference to FIG. FIG. 5 shows an example in which the system according to the present invention is applied to monitoring the lives of elderly people living alone. As shown in the figure, each of the PLC-compatible human sensor 50, the monitoring server 20 ', and the Internet connection PLC modem 30' is connected to the power line 100 via a PLC router outlet (not shown). These devices are also connected to the Internet via an Internet connection PLC modem 30 '.

  The PLC-compatible human sensor 50 includes, for example, an entrance monitoring PLC-compatible human sensor 501 and a movement monitoring PLC-compatible human sensor 502, which are arranged in the vicinity of the entrance or at an appropriate position in the building. The PLC-compatible human sensor 50 detects a human movement by infrared rays or ultrasonic waves and transmits a detection signal to the PLC router outlet. The PLC-compatible human sensor 50 is also assigned a unique IP address by a DHCP server function (not shown) of the connected PLC router outlet.

  The monitoring server 20 'is a monitoring server that receives and analyzes each PLC-compatible human sensor information and PLC router outlet information via the power line, and transmits information to the user terminal via the Internet in an emergency. FIG. 6 is a diagram showing a schematic configuration of the monitoring server 20 '. As shown in FIG. 6, the monitoring server 20 ′ includes an information reception unit 201 ′, a control unit 202 ′, a mail transmission unit 203 ′, a human sensor management database 204 ′, a user database 205 ′, and a detection. And an information log 206 ′.

  The information receiving unit 201 ′ is connected to the power line and is means for receiving PLC-compatible human sensor information and PLC router outlet information. The PLC-compatible human sensor information and the PLC router outlet information include at least a detection signal, a connection signal, a non-connection signal, and IP addresses of the PLC router outlet and the PLC-compatible human sensor. The detection signal is a signal transmitted to the information reception unit 201 ′ via the PLC router outlet and the power line when the PLC-compatible human sensor detects a human movement. The connection signal is a signal that the PLC router outlet transmits to the information reception unit 201 ′ via the power line when the PLC-compatible human sensor is connected to the PLC router outlet. The non-connection signal is a signal that the PLC router outlet transmits to the information receiving unit 201 ′ via the power line when the PLC-compatible human sensor is removed from the PLC router outlet. The IP address of the PLC router outlet is an IP address unique to the PLC router outlet, and is transmitted to the information receiving unit 201 ′ via the power line by the PLC router outlet. The IP address of the PLC-compatible human sensor is an IP address that is dynamically allocated when the PLC-compatible human sensor is connected to the PLC router outlet, and is transmitted to the information receiving unit 201 ′ via the power line by the PLC router outlet. Is done.

  The control unit 202 ′ is a unit that controls the operation of the entire monitoring server 20 ′, and operates by a program (not shown) that realizes operations described in detail below. The mail transmission unit 203 ′ is a program module that transmits an e-mail, a message, or the like that notifies the user's terminal of an emergency via the Internet.

  The human sensor management database 204 'is a database for managing information on PLC human sensors connected to the PLC router outlet, and is stored in a fixed disk (HDD) or the like in the monitoring server 20'. The human sensor management database 204 ′ registers at least the installation position of the PLC router outlet and the IP address of the PLC-compatible human sensor for each PLC router outlet that can be identified by the IP address. As the installation position of the PLC router outlet, for example, the installation position of each PLC router outlet installed in the building such as an entrance, a bedroom entrance, and a living room entrance is registered in advance by an administrator. In the IP address of the PLC-compatible human sensor, the IP address of the PLC-compatible human sensor connected to each PLC router outlet is registered. The IP address of the PLC-compatible human sensor is registered when the monitoring server 20 'receives a connection signal, and is deleted when the monitoring server 20' receives a non-connection signal.

  When the PLC-compatible human sensor is connected to the PLC router outlet, the PLC router outlet to which the human sensor is connected detects the connection by the connection detection unit, and assigns an IP address to the human sensor by the DHCP server. The PLC router outlet transmits the IP address of the human sensor, the IP address of the PLC router outlet, and the connection signal to the monitoring server 20 'from the transmission unit. The monitoring server 20 ′ calculates the PLC router outlet connected to the human sensor from the PLC router outlet IP address, and registers the IP address of the human sensor in the corresponding record in the database 204.

  When the PLC-compatible human sensor is removed from the PLC router outlet, the PLC router outlet to which the human sensor is connected is detected by the connection detection unit, and the IP address of the human sensor is detected by the DHCP server. Recover. The PLC router outlet transmits the IP address of the human sensor, the IP address of the PLC router outlet, and the disconnection signal to the monitoring server 20 ′ by the transmission unit. The monitoring server 20 'determines the PLC router outlet from which the human sensor has been removed from the PLC router outlet IP address, and deletes the IP address of the human sensor from the corresponding record in the human sensor management database 204'.

  The user database 205 ′ is a database that stores information on users who use the system of this embodiment, and is stored in a fixed disk (HDD) in the monitoring server 20. In the user database 205 ′, a mail address of a user terminal to be notified when an emergency occurs is registered in advance.

  The detection information log 206 ′ is a log for storing the detection information of the human sensor, and is stored in a fixed disk (HDD) in the monitoring server 20. The detection information log 206 'stores at least the installation position information of the human sensor, that is, the router outlet 10 to which the human sensor is connected, and time information including date, day of the week, and time.

  Next, the operation of this watching system will be described with reference to FIG. When detecting a human motion, the PLC-compatible human sensor transmits a detection signal to the monitoring server 20 'via the PLC router outlet and the power line (step B1). When the monitoring server 20 ′ receives the detection signal interrupted from the PLC router outlet, the stored standard action pattern information described later, at least the presence / absence of the detection information, the time information and the installation position information at the previous detection, and Comparison processing is performed using parameters such as current time information (step B2). As a result of the comparison processing, when the received information is different from the standardized behavior pattern (abnormal), the monitoring server 20 ′ adds the information to that effect to the address of the user terminal registered in the user database 205 ′. A predetermined operation such as notification is performed (step B3). As a result, for example, any PLC-compatible human sensor in the building detects human movements even though more than 60 minutes have elapsed since the human sensor was detected by the PLC human sensor at the entrance of the toilet. If not, the monitoring server 20 ′ determines that the behavior is different from the standard behavior, and transmits information to that effect to the user terminal. This is to notify the user terminal of the occurrence of an emergency because there is a possibility that the elderly person will not stay in the bathroom for 60 minutes or more and the elderly may fall down in the bathroom.

  After the comparison process, the monitoring server 20 'stores the detection information of the human sensor in the detection information log 206' (step B4). In this storing process, the position information of the human sensor derived from the IP address of the human sensor received with reference to the database 204 'and the time information including the date, day of the week, and time are stored. By returning to the initial process after the storage process (step B5), the process loops, and the monitoring server 20 'can always monitor and accept an interrupt from the human sensor as appropriate.

  Next, a description will be given of means for grasping human daily behavior according to the present embodiment. The monitoring server 20 'can grasp a series of actions in the human life detected by the PLC-compatible human sensor as daily actions and record them as new conditions. For example, after getting up, going out of the bedroom, going to the washroom, and then going to the living room after having finished washing, etc., a series of actions are detected by the human sensor as follows. First, after getting up, the behavior of leaving the bedroom and going to the bathroom is, in order, the presence sensor at the entrance to the bedroom, the presence sensor at the entrance to the living room, the presence sensor at the living room, the presence sensor at the dining entrance, and the entrance to the toilet. The human sensor detects. The action of going to the living room after taking a wash in the bathroom and taking a break is sequentially detected by the human sensor at the entrance of the bathroom, the human sensor at the entrance of the dining room, and the human sensor at the living room. The PLC router outlet transmits a detection signal, the IP address of the human sensor, and the IP address of the PLC router outlet to the monitoring server 20 ′ each time these human sensors detect human movements. The monitoring server 20 ′ records the detection position and date / time of each PLC human sensor in the detection information log 206 ′, refers to the log periodically, and within a predetermined period (that is, a predetermined time interval). In the case where one or more PLC human sensors are detected a predetermined number of times (for example, 10 times) in a specific order, the information is grasped as daily behavior and recorded as a new condition.

  While the preferred embodiment of the invention has been illustrated and described, it should be understood that various changes can be made without departing from the scope of the invention. In particular, in this embodiment, mail is transmitted to the user's terminal as a predetermined operation when an emergency occurs, but in addition, an emergency bell provided at a predetermined position is operated or a predetermined position is operated. Other operations may be performed, such as playing a voice message device provided in the.

  The present invention can be suitably used for information terminal management work in companies, various organizations, schools, and the like. In addition, the present invention can be suitably used in a home where there are elderly people living alone or in a care service for elderly people.

It is the schematic which shows the whole structure of the system using the PLC corresponding | compatible intelligent outlet concerning this invention. It is a figure which shows the functional concept of the PLC router outlet socket 10 concerning this invention. It is a figure which shows schematic structure of the monitoring server 20 concerning a present Example. It is a flowchart which shows operation | movement of the system concerning a present Example when a packet flood occurs. It is a figure which shows the example which applied the system concerning this invention to the life watching of the elderly living alone. It is a figure which shows schematic structure of the monitoring server 20 'concerning a present Example. It is a flowchart which shows operation | movement of the watching system concerning a present Example.

Explanation of symbols

10 PLC router outlet 20 Monitoring server 30 PLC modem for Internet connection 40 PLC information terminal 50 Human sensor for PLC 100 Power line 20 'Monitoring server 30' PLC modem for Internet connection

Claims (10)

A plurality of PLC router outlets, a monitoring server, and a PLC router outlet modem for connecting to the Internet are connected to a power line, and information transmitted from a device connected to each PLC router outlet is monitored and formed by the power line. In a system that controls the network and notifies users,
A system characterized in that each PLC router outlet comprises DHCP server means for managing IP addresses that can be distributed within the sub-network, and an independent sub-network is configured and managed for each PLC router outlet. The system of claim 1, wherein
The monitoring server monitors the network traffic of the power line and detects an abnormality of the PLC information terminal connected to the PLC router outlet, and the PLC router outlet connected to the PLC information terminal where the abnormality has occurred Means for transmitting a disconnect signal,
The PLC router outlet is separated by a PLC modem for power line connection that separates communication signals from current, a connection switch that controls the communication signals separated according to a control signal transmitted from the monitoring server, and the PLC modem. A subnet PLC router that communicates with a device connected to the PLC router outlet by superimposing the generated communication signal and current, and disconnecting the connection switch when a disconnection signal is received from the monitoring server. Features system.   The system according to claim 2, wherein the monitoring server further stores a storage area storing a user identification information database in which a mail address of a user of a PLC information terminal connected to the PLC router outlet is registered; A system comprising means for notifying occurrence of abnormality to a mail address of a user of the PLC information terminal that has occurred.   The system according to any one of claims 1 to 3, further comprising one or more PLC human sensors connected to the PLC router outlet, and wherein the monitoring server detects detection by each PLC human sensor. A storage area is provided in which predetermined conditions relating to the order and / or the interval thereof are registered, and when the order of detection by each PLC human sensor and / or the interval is out of the above conditions, it is determined that an emergency has occurred and is set in advance. A system characterized by executing emergency notification processing.   The system according to claim 4, wherein the monitoring server refers to a storage area for accumulating a detection information log in which a position and date / time of detection by each PLC human sensor is recorded, and periodically refers to the log, When one or more of the PLC human sensors are detected in a specific order a predetermined number of times within a predetermined period, the information acquisition means includes condition acquisition means for grasping the information as daily behavior and recording it as a new condition. System. A plurality of PLC router outlets, a monitoring server, and a PLC router outlet modem for connecting to the Internet are connected to a power line, and information transmitted from a device connected to each PLC router outlet is monitored and formed by the power line. In the method of controlling the network and notifying the user,
A method characterized in that each PLC router outlet comprises DHCP server means for managing IP addresses that can be distributed within the sub-network, and an independent sub-network is configured and managed for each PLC router outlet. The method of claim 6, wherein
The monitoring server monitors the network traffic of the power line, detects a PLC information terminal in which an abnormality has occurred, transmits a disconnection signal to a PLC router outlet connected to the PLC information terminal in which the abnormality has occurred,
The PLC router outlet is separated by a PLC modem for power line connection that separates communication signals from current, a connection switch that controls the communication signals separated according to a control signal transmitted from the monitoring server, and the PLC modem. A subnet PLC router that communicates with a device connected to the PLC router outlet by superimposing the generated communication signal and current, and disconnecting the connection switch when a disconnection signal is received from the monitoring server. Feature method.   The method according to claim 7, wherein the monitoring server further includes a storage area storing a user identification information database in which a mail address of a user of a PLC information terminal connected to the PLC router outlet is registered, A method of notifying the occurrence of an abnormality to a mail address of a user of the PLC information terminal in which the abnormality has occurred.   The method according to any one of claims 6 to 8, further comprising one or more PLC human sensors connected to the PLC router outlet, and wherein the monitoring server detects detection by each PLC human sensor. A storage area is provided in which predetermined conditions relating to the order and / or the interval thereof are registered, and when the order of detection by each PLC human sensor and / or the interval is out of the above conditions, it is determined that an emergency has occurred and is set in advance. A method characterized by executing emergency notification processing.   The method according to claim 9, wherein the monitoring server accumulates a detection information log in which a position and date / time of detection by each PLC human sensor is recorded, and refers to the log periodically, for a predetermined period of time. When one or more PLC human sensors are detected a predetermined number of times in a specific order, the information is extracted as daily activities and recorded in a storage area.

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