JP5421030B2 - Remote management system and domain information allocation method - Google Patents

Description

  The present invention relates to a remote management system and a domain information allocation method.

  There is a remote management system in which a plurality of terminal stations are connected to a single master station via a communication path, and the master station manages each terminal station (see, for example, Patent Document 1).

  In such a remote management system, when there are a plurality of master stations, each terminal station is assigned domain information and address information from one of the master stations, and the master station and the terminal stations can perform multihop etc. Perform the communication used. Multi-hop communication means that when the wiring length between the master station and the terminal station is long and the number of connected terminal stations is large, the terminal station within the communicable distance relays the communication signal so that This is a method for communicating with a station.

  The domain information is identification information given to each master station. The master station communicates a communication packet (Hello Packet) that notifies the existence of its own terminal in order to establish a communication path between the master station and each terminal station. Hereafter, abbreviated as H packet) and including the domain information. The terminal station that is not assigned an address monitors the H packet on the communication path, sets the domain information included in the first received H packet in the local station, and for the master station having the domain information, Request allocation of address information. That is, the information for determining the master station that is the address information allocation request destination is domain information, and the terminal station assigns the domain information contained in the first received H packet to the own station.

JP 2004-279097 A

  As described above, the process of assigning domain information to a terminal station is not controllable on the parent station side, but is performed at the terminal station side's judgment when an H packet is seen on the terminal station side. The same domain information is assigned to a plurality of terminal stations connected to the same trunk line.

  However, in an environment with multiple master stations, there are cases where domain information that should be assigned cannot be assigned to a terminal station depending on the communication environment and construction status at the time of assignment, increasing the communication error rate, The number of stations entering the station (number of terminal stations managed by one master station: the number of terminal stations to which the same domain information is assigned) is the maximum number of terminal stations that can be managed by one master station. The problem of exceeding the number of units) occurred.

  In such a case, it is necessary to reassign the domain information. As a conventional method, the process of reassigning the domain information by operating the maintenance terminal connected to the terminal by each worker is performed at each terminal station. It was necessary to judge and operate the human system. The information used for the judgment of the worker is, for example, a power line trunk diagram in the case of a remote management system using power line carrier communication. Based on this trunk diagram, the terminal station to which the domain information is reassigned is specified. It was a content that could only be done by workers with specialized knowledge and skills. Furthermore, when the trunk diagram of the power line cannot be obtained, the process of reallocating the domain information itself becomes very difficult.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a remote management system capable of automatically detecting a domain information allocation error at a terminal station and reassigning the domain information to the terminal station. And providing a domain information allocation method.

In the first aspect of the invention, a plurality of master stations and a plurality of terminal stations provided with managed devices communicate with each other via a communication path, the master station has different domain information, Domain information of any one master station and address information for identifying a plurality of terminal stations having the same domain information are allocated, and the device to be managed is allocated with the device identification information and attached by itself. The remote management system is managed by a master station having domain information assigned to the terminal station, and the master station has domain information and address information of each terminal station and a managed device attached to the terminal station. A configuration information storage unit that registers the correspondence with the device identification information, and a device that communicates with each terminal station using the domain information, address information, and device identification information in the configuration information storage unit to manage the managed device And a processing section, at least one of the master station and the terminal station, the domain information change processing unit that performs a process of re-allocating the domain information of the erroneous domain information is allocated terminal station, according to the domain information change processing unit A correction interval adjustment unit that adjusts a time interval for performing the reallocation processing based on the history of the reallocation processing , and the first terminal station is a master station to which the same domain information as the first terminal station is allocated or The reallocation processing performed by the domain information change processing unit of the second terminal station is performed by the domain information change processing unit of the master station or the third terminal station assigned domain information different from the first terminal station. It is characterized by being given priority .

According to the present invention, in the remote management system, it is possible to automatically perform the process of detecting the domain information allocation error in the terminal station and reassigning the domain information to the terminal station. Therefore, normalization of communication becomes possible, and the communication success rate between the master station and the terminal station can be improved. In addition, even if the reassignment process instructed from the same management communication network as that of the local station and the reallocation process instructed from a management communication network different from that of the local station compete with each other, By giving priority to the reallocation processing instructed from the communication network, more appropriate reallocation processing can be performed. In addition, the communication quality changes frequently as the number of reallocations within a certain period increases, and it is considered highly likely that communication will become unstable. By increasing the time interval for executing the allocation process, it is possible to reduce the frequency at which the domain information changes and to stabilize the communication.

  According to a second aspect of the present invention, in the first aspect, the master station includes the domain information change processing unit, and the domain information change processing unit of the master station is a terminal station to which the domain information of the master station is assigned. Among them, a process of reassigning domain information of a terminal station to which incorrect domain information is assigned is performed.

  According to the present invention, the master station can automatically perform the process of reassigning the domain information to the terminal station by detecting the domain information allocation error in the terminal station belonging to the same management communication network as the own station. Thus, even if the number of terminal stations entering under the control of one master station exceeds the designed number, or even when using a communication route whose communication environment has deteriorated due to straddling a transformer or a trunk line, etc. Normalization is possible, and the success rate of communication between the master station and the terminal station can be improved.

  The invention of claim 3 is the terminal station according to claim 1, wherein the master station includes the domain information change processing unit, and the domain information change processing unit of the master station is assigned domain information of another master station. Based on the quality of communication performed by the terminal station, the terminal station to which the incorrect domain information is assigned is detected from the terminal stations to which the domain information of the other master station is assigned, and the domain information of the detected terminal station is reassigned. It is characterized by performing processing.

  According to the present invention, the master station can automatically perform the process of reassigning the domain information to the terminal station by detecting the domain information allocation error in the terminal station belonging to a management communication network different from the own station. Thus, the master station determines that a terminal station belonging to a management communication network different from the own station should have a communication quality as seen from the own station should belong to the management communication network of the local station. By performing the information reallocation process, it is possible to normalize communication between the master station and the terminal station in another management communication network, and to improve the communication success rate between the master station and the terminal station.

The invention according to claim 4, in claim 1, wherein the end station comprises the domain information change processing unit, domain information change processing unit of the fourth end station, different domains information and the fourth terminal station based on the quality of the communication fifth terminal station allocated is performed, erroneous domain information detects the fifth terminal station assigned, reallocating domain information of the fifth terminal station that the detection process It is characterized by performing.

  According to the present invention, the terminal station can automatically perform the process of reassigning the domain information to the terminal station by detecting a domain information allocation error in the terminal station belonging to a management communication network different from that of the terminal station. Thus, even if there is a terminal station that has been assigned incorrect domain information but cannot be monitored by the master station, it is possible to detect an erroneous setting of domain information by a nearby terminal station and It is possible to normalize communication in a local environment where there is no communication, and the communication success rate between the master station and the terminal station can be improved.

In the invention of claim 5 , a plurality of master stations and a plurality of terminal stations provided with managed devices communicate with each other via a communication path, the master station has different domain information, Domain information of any one master station and address information for identifying a plurality of terminal stations having the same domain information are allocated, and the device to be managed is allocated with the device identification information and attached by itself. A domain information allocating method used in a remote management system managed by a master station having domain information allocated to a terminal station, wherein the master station includes domain information and address information of each terminal station and the terminal station. The correspondence with the device identification information of the managed device attached to the device is registered, and the managed device is managed by communicating with each terminal station using the registered domain information, address information, and device identification information. And, at least one of the master station or terminal station, accidentally have reassigned row processing domain information domain information assigned terminal station and, based on the history of the re-allocation process, the time re-allocation processing is carried out The first terminal station adjusts the interval, and the reassignment process performed by the master station or the second terminal station assigned the same domain information as the first terminal station is different from the first terminal station. Is performed in preference to the reallocation processing performed by the assigned master station or the third terminal station .

  According to the present invention, in the domain information allocating method, it is possible to automatically perform a process of detecting a domain information allocation error in a terminal station and reassigning the domain information to the terminal station. Therefore, normalization of communication becomes possible, and the communication success rate between the master station and the terminal station can be improved.

As described above, according to the present invention, there is an effect that it is possible to automatically perform a process of detecting an assignment error of domain information at a terminal station and reassigning domain information to the terminal station. In addition, even if the reassignment process instructed from the same management communication network as that of the local station and the reallocation process instructed from a management communication network different from that of the local station compete with each other, By giving priority to the reallocation processing instructed from the communication network, more appropriate reallocation processing can be performed. In addition, the communication quality changes frequently as the number of reallocations within a certain period increases, and it is considered highly likely that communication will become unstable. By increasing the time interval for executing the allocation process, it is possible to reduce the frequency at which the domain information changes and to stabilize the communication.

It is a figure which shows the structure of the remote management system by which the normal allocation of Embodiment 1 was made. (A) (b) It is a figure which shows the allocation process of NetID same as the above. It is a figure which shows the structure of the remote management system by which incorrect allocation same as the above was made. It is a figure which shows the structure of a master station same as the above. It is a figure which shows the structure of a terminal station same as the above. It is a figure which shows the structure of the remote management system by which incorrect allocation of Embodiment 2 was made. FIG. 6 is a diagram illustrating a configuration of a master station according to a third embodiment. It is a figure which shows the structure of a terminal station same as the above. It is a figure which shows the structure of the remote management system by which incorrect allocation same as the above was made.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Conventionally, when each tenant in an apartment building, office building, or commercial building is a consumer, a terminal station with a power measuring device, which is a managed device, and an electrical room in an apartment building, office building, or commercial building The meter reading data (that is, power consumption) obtained by the power measuring device of each consumer by performing communication by power line carrier communication (hereinafter abbreviated as PLC (Power Line Communication)) with the master station arranged in A remote meter-reading system has been proposed in which the master station acquires the amount) from the terminal station and aggregates the meter-reading data at the master station. The master station is connected to an aggregation device (server) of an electric power company through a wide area information communication network such as the Internet. In response to a meter reading request from the aggregation device, the master station obtains meter reading data from the terminal station to the aggregation device. Remote meter reading is possible by transmitting or acquiring meter reading data from a terminal station at predetermined intervals and transmitting it to a counting device. In a remote management system that manages the operation and status of managed devices using such a power line carrier communication network (hereinafter referred to as a PLC network), the wiring length between communication terminals is long, and the number of communication terminals connected Therefore, so-called multi-hop communication is performed in which a communication terminal located within a communicable distance relays a PLC signal to perform communication between a terminal station and a master station.

  Hereinafter, the above remote meter reading system will be exemplified as the remote management system of the present invention.

  The remote meter reading system according to the present embodiment assumes a case where a plurality of power measuring devices are arranged in one building such as an apartment house, an office building, or a commercial building. In this type of building, as shown in FIG. 1, a plurality of trunk lines (100V / 200V low-voltage lines) Lb (Lb1, Lb1, Lb1, L2) branched from a high-voltage power line (6600V medium-high voltage line) Lt supplied with commercial power Lb21, Lb22) are wired. Step-down transformers Tr (Tr1, Tr21, Tr22) are provided at branch points between the high-voltage power line Lt and the main lines Lb, respectively. The step-down transformer Tr steps down the voltage of the high-voltage power line Lt to 100 V / 200 V (single-phase three lines and the voltage line is 200 V), and has a capacity of about 20 to 200 kVA, for example.

  In this embodiment, a case where a step-down transformer Tr is provided for each trunk line Lb in an apartment house, and a case where power is branched from the trunk line Lb connected to the secondary side of the step-down transformer Tr and is supplied to each dwelling unit will be described as an example. Each dwelling unit is provided with a power measuring device 3 that is a device to be managed in order to charge an electric bill for each dwelling unit, and the integrated power is measured for each dwelling unit to generate meter reading data.

  And since the remote meter reading system aims at metering the amount of electric power used in each dwelling unit remotely, it is necessary to transmit the meter-reading data which power measuring device 3 generated by communication. Here, communication by power line carrier communication (hereinafter abbreviated as “PLC”, PLC = Power Line Communication) is performed using the trunk line Lb as a part of a communication path for transmitting meter reading data obtained by the power measuring device 3.

  The meter reading data of the power measuring device 3 provided in each dwelling unit is collected in the master station 1 (11, 12) that has assigned the trunk line based on the number of terminals accommodated, for example. The master station 1 communicates with a server (not shown) managed by the power company through a wide area information communication network such as the Internet. Therefore, the server can individually acquire the amount of power used in each dwelling unit.

  In order to transmit the meter reading data of the power measuring device 3 provided in each dwelling unit to the master station 1, each power measuring device 3 communicates with the master station 1 in the terminal stations 2 (21, 22, 23, 24, 25, ...). Each terminal 2 is given terminal identification information (GUID) at the time of shipment, and the GUID is composed of unique 6-byte data. In FIG. 1, reference numerals 21, 22, 23, 24, 25,. . . Corresponds to the GUID, and corresponds to the hardware of the terminal station 2 on a one-to-one basis. Also, the power measuring device 3 is given unique device identification information (instrument ID) at the time of shipment.

  Furthermore, the terminal station 2 is given domain information (NetID) and address information (NodeID) with the master station 1 as the issuer.

  The address information (NodeID) is address information used when the master station 1 communicates with the terminal station 2 to perform management processing of the power measuring device 3, and is assigned to each terminal station 2.

  The domain information (NetID) is identification information assigned to each master station 1, and the master station 1 makes its own terminal live in order to establish a communication path between the master station 1 and each terminal station 2. The communication packet to be notified (Hello Packet, hereinafter abbreviated as H packet) includes the NetID of the own station and is transmitted by flooding. The terminal station 2 to which no NetID is assigned monitors the H packet on the trunk line Lb, sets the NetID included in the first received H packet to the own station, and sets the NetID to the master station 1 having the NetID. To request the assignment of the NodeID. That is, the information that determines the master station 1 that is the node ID allocation request destination is the NetID, and the terminal station 2 assigns the NetID included in the first received H packet to the local station. The master station 1 and the terminal station 2 assigned with the same NetID form one management communication network, and the master station 1 acquires meter reading data from the terminal station 2 belonging to the same management communication network as the own station. To do.

  And the terminal station 2 is connected to each trunk line Lb, and normally, a plurality of terminal stations 2 are connected to one system trunk line Lb since power is supplied to a plurality of dwelling units from one system trunk line Lb. . The terminal station 2 collects and stores meter reading data from the attached power measuring device 3 at predetermined time intervals. When the master station 1 acquires meter reading data from the terminal station 2, the terminal station 1 However, the polling data stored in each terminal station 2 is acquired by polling each terminal station 2 in the management communication network of the local station.

  Further, in the present embodiment, in order to connect a plurality of trunk lines Lb to one master station 1, the coupler 6 is provided by one less than the number of trunk lines Lb. That is, when adding a system of the trunk line Lb under the control of one master station 1, the coupler 6 is connected to the original system, the trunk line Lb is added via the coupler 6, and the coupler 6 passes power. And only the PLC signal can be passed. In FIG. 1, a trunk line Lb 21 and a trunk line Lb 22 that constitute the same management communication network as the master station 12 are connected via a coupler 6.

  In such a remote meter-reading system, the master station 1 needs to assign NetID and NodeID to the terminal station 2, respectively. In particular, NetID, which is domain information, is information that is particularly important when a plurality of master stations 1 are used, and the terminal station 2 belongs to the same management communication network as the own station (has the same NetID as the own station). It is possible to request a NodeID from the master station 1, and the master station 1 that has received the request can assign the NodeID to the requesting terminal station 2. In FIG. 1, the terminal stations 21 and 22 connected to the trunk line Lb1 are assigned NetID = 1 and NodeID = 101 and 102 from the master station 11, and the terminal stations 23, 24 and 25 connected to the trunk lines Lb21 and Lb22 are , NetID = 2, NodeID = 101, 102,. . . Are assigned to the terminal stations 21, 22,. . . NetID (NetID to be assigned at the time of design) that should be assigned to is assigned.

  Therefore, the NetID needs to be assigned to the terminal station 2 before the master station 1 assigns the NodeID to the terminal station 2. However, conventionally, the master station 1 has not been able to control the NetID assignment process for the terminal station 2.

  Specifically, since it is a communication environment in which only the terminal station 2 connected to the same trunk line Lb as each parent station 1 is normally capable of PLC communication with the parent station 1, The station 2 receives the H packet from the master station 1, and operates without a problem by a mechanism in which the NetID included in the H packet received first on the terminal station 2 side is set in the local station.

  However, under a specific communication environment, for example, the terminal stations 23 and 24 to be subordinate to the master station 12 are not in a situation where only communication on the trunk line Lb21 to which the own station is connected can be seen. Communication on the trunk line Lb1 passes through the high-voltage transformer Tr1, passes through the high-voltage power line Lt, and passes through the step-down transformer Tr21 that branches off the trunk line Lb21 of the local station, so that communication on the other trunk line Lb1 can be seen. There was a case where a so-called transformer crossing situation occurred. In general, when the signal passes through the step-down transformer Tr, the signal level is significantly attenuated. Therefore, if the PLC signal is normally attenuated normally, the NetID can be erroneously assigned from the master station 11 of the other trunk line Lb1. Must not. However, depending on the step-down transformer Tr and the form of wiring, there is a case where the H packet from the master station 1 of another trunk line Lb is received even through the step-down transformer Tr.

  In this way, the terminal station 2 can see the communication of the master station 1 on the trunk line Lb different from the own station, that is, in an environment where the communication including the NetID different from the NetID that should be originally assigned to the own station can be seen. When the terminal station 2 sets a NetID, it is necessary to select a NetID that should be assigned to the local station from a plurality of H packets including different NetIDs.

  Therefore, in the terminal station 2 before the NetID is assigned, when the signal strength (reception sensitivity) of the received H packet is equal to or greater than a certain value, the NetID included in the H packet is set in the local station. Is less than a certain value (when it is assumed that an H packet has been received across a transformer), a watch period (for example, 30 minutes) is provided after reception of the H packet. If an H packet including another NetID is received with a signal strength of a certain value or more within this watch period, this NetID is set in the local station. If an H packet having a signal strength equal to or higher than a certain value is not received within the watch period, the NetID included in the H packet having the highest signal strength among the H packets received within the watch period is set in the local station.

  For example, in FIG. 2A, there are a master station 11 with NetID = 1, a master station 12 with NetID = 2, and terminal stations 21 to 24 before NetID is assigned. Originally, it is assumed that NetID = 1 of the master station 11 is assigned. First, the terminal station 21 first receives an H packet from the master station 12, but the signal strength is less than a certain value, so a 30 minute watch period is started. Then, since the H packet having a signal strength of a certain value or more is received from the master station 11 during the watch period, NetID = 1 of the master station 11 is set to the own station. The terminal station 21 having set the NetID transmits a NodeID allocation request to the master station 11 and acquires the NodeID from the master station 11.

  Next, the terminal station 21 to which NetID and NodeID are assigned transmits an H packet including NodeID = 1 by broadcast. Here, the terminal station 22 receives the H packet from the terminal station 21, performs processing based on the signal strength in the same manner as described above, sets its own NetID = 1, and also acquires the NodeID from the parent station 11. Thereafter, the terminal station 22 also transmits the H packet by broadcast, and each terminal station 2 is assigned NetID and NodeID as described above.

  When the terminal station 2 to which the NetID and NodeID are assigned and the parent station 1 perform communication such as remote meter reading, the terminal station 2 located in the middle of the communication path relays the PLC signal, thereby Multi-hop communication is performed for exchanging signals between 1 and the terminal station 2. In multi-hop communication, a communication path (hereinafter referred to as a route) between communication terminals (master station 1-terminal station 2) serving as a starting point and an arriving point of communication data can be directly communicated without relaying other communication terminals. It is configured by connecting one or a plurality of communication paths (hereinafter referred to as branches) between a pair of possible communication terminals. In order to determine a route between the master station 1 and the terminal station 2 in multi-hop communication, the master station 1 searches for a route including one or more branches that can be taken between the master station 1 and the terminal station 2, and The communication cost in each branch constituting the route is evaluated, and the route having the lowest total communication cost of all the branches constituting the route is selected from the communicable routes. Then, the master station 1 performs the above-described route calculation, and holds route information of a route formed between each terminal station 2 belonging to the same management communication network as the own station.

  This communication cost is obtained by quantifying the signal attenuation at the branch between the pair of communication terminals. The communication cost is low when the signal attenuation is small, and the communication cost is high when the signal attenuation is large. For example, the communication cost “31” is higher than the communication cost “5”, and the signal attenuation is also increased.

  The terminal station 2 has the same NetID as that of the own station and acquires information about the route (route information) configured with the parent station 1 belonging to the same management communication network from the parent station 1 and holds the information. In the route information, each information of communication cost and NodeID is stored for each relay terminal station in order from the relay terminal station of the first hop on the route to the master station 1.

  However, the process of assigning NetID and NodeID to the terminal station 2 as described above is effective when communication by a plurality of parent stations 1 is normally performed, and if any one of the parent stations 1 has any cause. If the coupler 6 between the trunk lines Lb is not normally connected, or if it is under a specific communication environment depending on the step-down transformer Tr or the form of the wiring, etc. May be set. Then, the terminal station 2 transmits a node ID assignment request to the wrong master station 1 and is assigned a node ID from the wrong master station 1, and the terminal station 2 belongs to a management communication network different from the original, In the remote meter reading, meter reading data is transmitted to the master station 1 which is different from the original (different from the design time).

  For example, in FIG. 2B, when the construction of the master station 11 is delayed, the terminal station 21 first receives the H packet from the master station 12, but the signal strength is less than a certain value. Start a minute watch period. However, since the construction of the master station 11 is delayed, no H packet is transmitted from the master station 11 during the watch period, and the terminal station 21 sets NetID = 2 of the master station 12 to its own station. The terminal station 21 having set NetID = 2 transmits a node ID allocation request to the master station 12 and acquires the Node ID from the master station 12. That is, the terminal station 21 is assigned a NetID that is different from the original, and in subsequent remote meter reading, the meter reading data is transmitted to the master station 12 that is different from the original (different from the design time).

In this way, when there is a terminal station 2 to which a different NetID is assigned,
-Due to the deterioration of communication quality between the master station 1 and the terminal station 2, the success rate of regular meter reading in which the master station 1 periodically acquires meter reading data from the terminal station 2 decreases.
-The number of terminal stations 2 under the control of master station 1 (the number of terminal stations managed by one master station: the number of terminal stations 2 to which the same NetID is assigned) is the number of designs (one master station The maximum number of terminal stations 2 that can be managed by the station 1 is exceeded.
There was a communication problem. Thus, it has been required to normalize communication of the entire remote meter reading system by resetting the NetID that should be originally assigned to the terminal station 2 to which the wrong NetID has been assigned. Therefore, in the present embodiment, the NetID that should be originally assigned is reset to the terminal station 2 that has been assigned the wrong NetID as follows.

  First, as shown in FIG. 3, a case will be described in which an incorrect NetID setting occurs due to transformer straddling.

  As shown in FIG. 4, the master station 1 includes a PLC communication unit 1a, a device operation management unit 1b, an information management unit 1c, a configuration information storage unit 1d, a route information storage unit 1e, and a domain information change processing unit. 1f. The PLC communication unit 1a exchanges PLC signals with the trunk line Lb. The device operation management unit 1b manages the operation of the power measuring device 3 via the terminal station 2, acquires and accumulates meter reading data, and transmits the meter reading data accumulated in response to a request from the server. . The information management unit 1c monitors the PLC signal on the main line Lb to which the local station is connected, and manages each information in the configuration information storage unit 1d and the route information storage unit 1e. The domain information change processing unit 1f resets the NetID that should be originally assigned to the terminal station 2 that has been assigned the wrong NetID.

  As shown in FIG. 5, the terminal station 2 includes a PLC communication unit 2a, a device monitoring control unit 2b, an information management unit 2c, a configuration information storage unit 2d, and a route information storage unit 2e. The PLC communication unit 2a exchanges PLC signals with the trunk line Lb. The device monitoring control unit 2 b periodically acquires meter reading data of the power measuring device 3 and transmits the meter reading data accumulated in response to a request from the master station 1 to the master station 1. The information management unit 2c monitors the PLC signal on the main line Lb to which the local station is connected, and manages each information in the configuration information storage unit 2d and the route information storage unit 2e.

  Then, the information management unit 1c of the master station 1 transmits the H packet for notifying the existence of the own terminal and including the NetID of the own station in order to establish a communication path between the master station 1 and each terminal station 2. To do. The information management unit 2c of the terminal station 2 to which no NetID is assigned monitors the H packet on the trunk line Lb and performs entry processing to the master station 1. The NetID is assigned to the local station based on the received H packet. And a NodeID allocation request is transmitted to the master station 1 having the NetID. The information management unit 1c that has received the node ID assignment request notifies the request source terminal station 2 of the Node ID. Here, the NodeID allocation request includes the GUID of the terminal station 2 that is the transmission source and the instrument ID of the power measurement device 3 attached to the terminal station 2, and the information management unit 1c The configuration information indicating the correspondence relationship between the NetID, NodeID, GUID, and the meter ID of the power measuring device 3 attached to the terminal station 2 is stored in the configuration information storage unit 1d. That is, in the configuration information storage unit 1d of the master station 1, the NetID, NodeID, GUID, and instrument ID set in the terminal station 2 belonging to the same management communication network as the own station and the power measuring device 3 attached to the terminal station 2 are stored. Are registered corresponding to each other. Further, in the configuration information storage unit 2d of the terminal station 2, the NetID, NodeID, GUID set in the own station, and the meter ID of the power measuring device 3 attached to the own station are registered as configuration information.

  In the above process, the instrument ID of the power measuring device 3 is included in the node ID allocation request during the node ID allocation process, so that the terminal ID notifies the master station 1 of the instrument ID. The ID notification may be performed in a process different from the NodeID allocation process. That is, the node ID assignment request transmitted by the terminal station 2 does not include the instrument ID, and after the node ID assignment process is completed, the terminal station 2 reads the instrument ID from the power measurement device 3 and stores it in the configuration information storage unit 2d. At the same time, the instrument ID may be transmitted to the master station 1, and the master station 1 may store the received instrument ID in the configuration information storage unit 1d.

  Further, the information management unit 1c of the master station 1 generates route information of each terminal station 2 by communicating with each terminal station 2 belonging to the same management communication network as the own station, and performs the same management communication as the own station. The route information of each terminal station 2 belonging to the network is stored in the route information storage unit 1e. The information management unit 2c of the terminal station 2 collects route information of the local station from the master station 1 belonging to the same management communication network as the local station, and the route information storage unit 2e stores the parent information belonging to the same management communication network. Stores route information with the station 1. Note that the route construction method is well known, and details are omitted.

  In this example, the terminal stations 23 and 24 can see the PLC signal of the master station 11 by the transformer straddling via the step-down transformers Tr1 and Tr21, and the master station 11 is not the NetID = 2 of the master station 12 to be originally allocated. Since NetID = 1 of 11 is assigned by mistake, communication such as regular meter reading is performed with the master station 11 instead of the master station 12 that should originally communicate. The contents of this erroneous setting are also reflected in the route information held by the master station 11. In this example, in the route information of the terminal stations 23 and 24 held by the master station 11, the first hop of the route viewed from the master station 11 is the terminal station 23 by crossing the transformer. However, the communication cost of the branch (first hop branch) between the master station 11 and the terminal station 23 is high because it passes through the step-down transformers Tr1 and Tr21.

  Therefore, the domain information change processing unit 1f of the master station 11 periodically determines whether or not the communication cost of the first hop branch is equal to or higher than a predetermined value in the route information of each terminal station 2 in the route information storage unit 1e. It is judged. If there is route information in which the communication cost of the first hop branch is equal to or greater than a predetermined value, the terminal station 2 having the route information determines that the NetID has been incorrectly assigned by crossing the transformer, and A NetID reset request is made by unicast communication. Here, since the route information of the terminal stations 23 and 24 is a branch that reaches the terminal station 23 after the first hop passes through the step-down transformers Tr1 and Tr21, the communication cost of the first hop branch is low. The NetID reset request is transmitted from the master station 11 to the terminal stations 23 and 24.

  In the terminal stations 23 and 24 that have received the NetID reset request, the information management unit 2c returns (resets) the configuration information of the local station stored in the configuration information storage unit 2d to the default, and sends the H packet on the trunk line Lb. Monitor and perform re-entry processing to the master station 1. In this case, since the terminal stations 23 and 24 have a higher signal strength of the H packet of the parent station 12 than the H packet of the parent station 11, NetID = 2 of the parent station 12 is set to its own station, and thereafter NodeID is acquired from the above, new configuration information is generated, and stored in the configuration information storage unit 2d. The information management unit 1c of the master station 12 stores the configuration information of the terminal stations 23 and 24 in the configuration information storage unit 1d. Thereafter, the information management unit 1c of the master station 12 performs route calculation, generates route information between the own station and the terminal stations 23 and 24, and stores the route information in the route information storage unit 1e. The information management unit 2c of the terminal stations 23 and 24 collects route information from the master station 12, and the route information storage unit 2e stores the route information of the own station.

  In the master station 1, the configuration information and route information of the terminal station 2 changed from the NetID of the own station to the NetID of the other master station 1 are deleted when communication with the terminal station 2 continues for a certain period of time. You may comprise.

  Note that, as described above, the NetID reassignment process by the domain information change processing unit 1f for the terminal station 2 belonging to the same management communication network as that of the own station is as follows: (1) The first hop branch in the route information There are the following methods (2) to (4) in addition to the NetID reassignment process based on the communication cost.

  (2) The domain information change processing unit 1f refers to the configuration information storage unit 1d of its own station, and the number of substation 2 subordinates entered (number of terminal stations managed by one master station: the same NetID is assigned) If the number of terminal stations 2) exceeds the design number (the maximum number of terminal stations 2 that can be managed by one master station 1), all terminal stations 2 belonging to the same management communication network as the own station In response, a NetID reset request is transmitted by flooding. In the terminal station 2 that has received the NetID reset request, the information management unit 2c returns the configuration information of the local station stored in the configuration information storage unit 2d to the default, and monitors the H packet on the trunk line Lb to monitor the master station. Re-entry process to 1.

  (3) The domain information change processing unit 1f refers to each route information in the route information storage unit 1e of its own station, and the route for each terminal station 2 includes a branch whose communication cost is equal to or higher than a predetermined value. It is determined periodically. When there is route information including a branch whose communication cost is equal to or higher than a predetermined value, a NetID reset request is transmitted to the terminal station 2 having the route information by unicast. In the terminal station 2 that has received the NetID reset request, the information management unit 2c returns the configuration information of the local station stored in the configuration information storage unit 2d to the default, and monitors the H packet on the trunk line Lb to monitor the master station. Re-entry process to 1.

  In this method, for example, when a plurality of trunk lines Lb are arranged in the same duct, a signal leaks between the trunk lines Lb adjacent to each other, so that the terminal station 2 connected to one trunk line Lb and the other trunk line. This is effective for the so-called trunk line straddling where the PLC signal on Lb is visible. That is, since the signal strength of the route information of the terminal station 2 to which the wrong NetID is assigned due to the occurrence of trunk straddling is attenuated when the PLC signal leaks between different trunk lines Lb, a branch having a high communication cost in the route. The method (3) performs the NetID reassignment process by determining the presence or absence of a branch whose communication cost has increased due to the crossing of the trunk line.

  (4) The application communication management unit 1g (see the broken line in FIG. 4) is provided in the master station 1, and the application communication management unit 1g monitors the success or failure of each of the regular meter readings performed with the terminal station 2, The failure rate of regular meter reading for each terminal station 2 is derived from the monitoring result, and a NetID reset request is transmitted by unicast to the terminal station 2 having a high failure rate. In the terminal station 2 that has received the NetID reset request, the information management unit 2c returns the configuration information of the local station stored in the configuration information storage unit 2d to the default, and monitors the H packet on the trunk line Lb to monitor the master station. Re-entry process to 1.

  As described above, the master station 1 transmits a NetID reset request to the terminal station 2 in which the NetID is presumed to be mistakenly assigned among the terminal stations 2 belonging to the same management communication network as the own station. , Instructing to re-enter the master station 1 after returning the NetID to the default, automatically detecting the NetID assignment error at the terminal station 2 and automatically reassigning the NetID to the terminal station 2 Can do. Thus, even when the number of terminal stations 2 entering under the control of one master station 1 exceeds the designed number, or even when using a communication route whose communication environment has deteriorated due to straddling a transformer or straddling a trunk line, Communication can be normalized and the success rate of communication between the master station 1 and the terminal station 2 can be improved.

  Further, after transmitting the NetID reset request, the master station 1 shifts to the Fast mode in which the time interval for transmitting the H packet is shorter than that in the normal mode. Specifically, by setting the H packet transmission interval to, for example, five times that of the normal mode, NetID is quickly distributed to the entire system using H packets. The terminal station 2 in which NetID is not set monitors the H packet of the other master station 1 until the watch period of, for example, 30 minutes elapses after receiving the H packet of the master station 1, and this watch period It is desirable to receive as many H packets as possible from the master station 1 (the transmission interval of H packets in the normal mode is, for example, 30 minutes).

  Therefore, the master station 1 that has transmitted the NetID reset request can distribute the NetID at an effective time interval by making the time interval for transmitting the H packet shorter than that in the normal mode. When one master station 1 transitions to the Fast mode, a transition request from the master station 1 to the Fast mode is transmitted by flooding, and other master stations 1 that have received the transition request also transition to the Fast mode. The entire system operates in Fast mode.

  Alternatively, the terminal station 2 that has received the NetID reset request may shift to the VerySlow mode in which the watch period is longer than the normal mode. In this case, only the terminal station 2 that performs the re-entry process to the master station 1 needs to shift to the VerySlow mode, and the communication traffic amount of the entire system does not increase, so that adverse effects on communications such as regular meter reading are suppressed.

  In addition, the domain information change processing unit 1f of the master station 1 periodically performs the reallocation process of any one of the above (1) to (4), and periodically determines the NetID misconfiguration in the terminal station 2. However, the correction interval adjustment unit 1h (see the broken line in FIG. 4) is provided in the master station 1, and the time interval at which the domain information change processing unit 1f executes the reallocation processing according to the number of past reallocation processing. May be adjusted. Specifically, the environment is such that the communication quality changes more frequently as the number of reallocations within a certain period is larger, and it is considered that there is a high possibility that the communication becomes unstable. Therefore, the correction interval adjustment unit 1h stores the number of reallocations within a certain period in the past from the present. If the number of reallocations is equal to or greater than the predetermined number, the time interval for executing the reallocation processing is lengthened, and the domain information Reduces the frequency of changes and stabilizes communication. That is, the terminal station 2 with a large number of reallocations does not change the NetID frequently, and controls so that one NetID is continuously used. Then, when a predetermined time has elapsed since the time interval of the reallocation processing is increased, the time interval of the reallocation processing is shortened and returned to the original so that it can immediately respond to changes in the communication environment.

(Embodiment 2)
The master station 1 according to the first embodiment determines whether or not the NetID is erroneously assigned to the terminal station 2 belonging to the same management communication network as the own station. Determines whether the NetID is erroneously assigned to the terminal station 2 belonging to a management communication network different from the local station. Note that the system configuration of the present embodiment is the same as that of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  First, the PLC signal transmitted by the terminal station 2 includes route information between the own station and the parent station 1 of the transmission destination and the configuration information of the own station. The parent station 1 transmits the PLC signal on the trunk line Lb. Based on the route information and configuration information included in each PLC signal, the PLC signal of the terminal station 2 belonging to the same management communication network as the own station or the management communication network of the other master station 1 It can be discriminated whether it is a PLC signal of the terminal station 2 (which has a NetID different from that of the station). Then, the domain information change processing unit 1f of the master station 1 captures the PLC signal on the trunk line Lb, and when the PLC signal transmitted from the terminal station 2 belonging to the management communication network of the other master station 1 passes through its own station. The signal strength (communication cost) is derived, and based on the derived signal strength, it is determined whether or not an incorrect NetID is assigned to the terminal station 2 that originally belongs to the same management communication network as the local station. To do.

  For example, as shown in FIG. 6, a case where an incorrect NetID setting has occurred in the terminal station 21 will be described. In this example, the terminal station 21 can see the PLC signal of the master station 12 by crossing the transformer, straddling the trunk line, etc., and is not the NetID = 1 of the master station 11 to be originally allocated, but the NetID = 2 of the master station 12. Therefore, communication such as regular meter reading is performed with the master station 12 instead of the master station 11 to be originally communicated.

  The domain information change processing unit 1f of the master station 11 also captures the PLC signal on the trunk line Lb1 transmitted from the terminal station 21 to the master station 12, and derives the signal strength of the PLC signal transmitted from the terminal station 21. . Since the terminal station 21 is connected to the same trunk line Lb1 as the master station 11, the derived signal strength is equal to or greater than a predetermined value, and the domain information change processing unit 1f is a terminal station belonging to a management communication network different from its own station. 21 (NetID = 2, NodeID = 104) is communicated across the domain, a NetID change request is transmitted, and an instruction to forcibly change NetID to “1” is issued.

  In the terminal station 21 that has received the NetID change request, the information management unit 2c changes the configuration information of the local station stored in the configuration information storage unit 2d to NetID = 1, and then acquires the NodeID from the master station 11. Then, new configuration information is generated and stored in the configuration information storage unit 2d. The information management unit 1c of the master station 11 stores the configuration information of the terminal station 21 in the configuration information storage unit 1d. Thereafter, the information management unit 1c of the master station 11 performs route calculation, generates route information between the own station and the terminal station 21, and stores it in the route information storage unit 1e. The information management unit 2c of the terminal station 21 collects route information from the master station 11, and the route information storage unit 2e stores the route information of the own station.

  As described above, the NetID reassignment process by the domain information change processing unit 1f for the terminal station 2 belonging to the management communication network different from the own station is (11) NetID reassignment process based on the signal strength of the PLC signal. In addition, there are the following methods (12) to (13).

  (12) First, the information management unit 1c of the master station 1 monitors the PLC signal on the trunk line Lb, and belongs to the management communication network of the other master station (has the same NetID as the other master station 1). ) The communication contents of the terminal station 2 can also be grasped. Specifically, the terminal station 2 includes the route information between the own station and the transmission destination parent station in the PLC signal to be transmitted, and the parent station 1 monitors the PLC signal on the trunk line Lb. The route information of the terminal station 2 belonging to the management communication network of the other master station is also acquired and stored in the route information storage unit 1e.

  Then, the domain information change processing unit 1f periodically determines whether or not the communication cost of the branch of the first hop is equal to or higher than a predetermined value in the route information of each terminal station 2 in the route information storage unit 1e. If there is route information whose communication cost of the first hop branch is equal to or higher than a predetermined value, the terminal station 2 having the route information determines that there is a possibility that the NetID is erroneously assigned by crossing the transformer. Then, a change request of NetID is made to the terminal station 2 by cross-domain communication. In the terminal station 2 that has received the NetID change request, the information management unit 2c changes the NetID stored in the configuration information storage unit 2d, and performs re-entry processing to the parent station 1 after the change.

  (13) Similar to (12) above, the master station 1 monitors the PLC signal on the trunk line Lb, thereby acquiring the route information of the terminal station 2 belonging to the management communication network of the other master station. Stored in the information storage unit 1e, the domain information change processing unit 1f refers to each route information in the route information storage unit 1e of its own station, and the communication cost for the route for each terminal station 2 is equal to or higher than a predetermined value. It is periodically determined whether or not a branch is included. Then, if there is route information including a branch whose communication cost is equal to or greater than a predetermined value, the terminal station 2 having the route information determines that there is a possibility that the NetID has been erroneously allocated by crossing the trunk line, A request for changing the NetID is made to the terminal station 2 by cross-domain communication. In the terminal station 2 that has received the NetID change request, the information management unit 2c changes the NetID of the own station stored in the configuration information storage unit 2d, and performs re-entry processing to the parent station 1 after the change.

  In this way, the master station 1 transmits a NetID change request to the terminal station 2 in which the NetID is presumed to be mistakenly assigned among the terminal stations 2 belonging to a management communication network different from the own station, It is instructed to perform re-entry processing to the master station 1 after changing the NetID, and it is possible to automatically detect the NetID assignment error at the terminal station 2 and reassign the NetID to the terminal station 2. Thus, the master station 1 determines that, among the terminal stations 2 belonging to the management communication network different from the own station, those having good communication quality as viewed from the own station should belong to the management communication network of the own station. By assigning the NetID of the own station, it is possible to normalize communication in another management communication network, and improve the communication success rate between the master station 1 and the terminal station 2.

  Similarly to the first embodiment, the master station 1 is provided with a correction interval adjustment unit 1h (see the broken line in FIG. 4), and the domain information change processing unit 1f performs the reallocation process according to the number of past reallocations. You may adjust the time interval to perform.

(Embodiment 3)
In the first and second embodiments, the master station 1 determines that the NetID is incorrectly set for the terminal station 2, but in the present embodiment, the terminal station 2 selects the terminal station 2 belonging to a management communication network different from the own station. A mis-set of NetID is determined as a target. Note that the system configuration of the present embodiment is the same as that of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, the master station 1 of this embodiment includes a PLC communication unit 1a, a device operation management unit 1b, an information management unit 1c, a configuration information storage unit 1d, and a route information storage unit 1e. Is done. As shown in FIG. 8, the terminal station 2 includes a PLC communication unit 2a, a device monitoring control unit 2b, an information management unit 2c, a configuration information storage unit 2d, a route information storage unit 2e, and a domain information change process. Part 2f.

  As shown in FIG. 9, when a trunk line straddle in which a PLC signal leaks from the end of the trunk line Lb1 to the trunk line Lb21 occurs, the terminal station 22 connected to the end of the trunk line Lb1 is assigned NetID = 2 of the master station 12 The master station 11 does not exist in the communication path K formed between the terminal station 22 and the master station 12, and the PLC signal of the terminal station 22 is not visible to the master station 11. Accordingly, the NetID reassignment process by the master station 11 cannot be executed.

  Therefore, the PLC signal transmitted by the terminal station 2 includes route information between the own station and the parent station of the transmission destination, and configuration information of the own station. Based on the route information included in the PLC signal, The terminal station 2 determines a NetID error setting for the terminal station 2 belonging to a management communication network different from the local station. In the state of FIG. 9, the terminal station 21 belonging to the management communication network of the master station 11 also obtains route information of the terminal station 22 belonging to the management communication network of the master station 12 by monitoring the PLC signal on the trunk line Lb1. And stored in the route information storage unit 2e.

  The domain information change processing unit 2f of the terminal station 21 then determines the communication cost of each route between the terminal station 22 and the master station 12 based on the route information of the terminal station 22 in the route information storage unit 2e. The total communication cost of the branch) is derived and compared with the communication cost of the route between the terminal station 22 -the own station (terminal station 21) -the master station 11. If the communication cost between the terminal station 22 and the parent station 12 is higher than the communication cost between the terminal station 22 and the own station (terminal station 21) and the parent station 11, the domain information change processing unit 2f of the terminal station 21 The terminal 22 (NetID = 2, NodeID = 104) belonging to a different management communication network is communicated across the domain, a NetID change request is transmitted, and the NetID is forcibly changed to “1”.

  In the terminal station 22 that has received the NetID change request, the information management unit 2c changes the configuration information of the local station stored in the configuration information storage unit 2d to NetID = 1, and then acquires the NodeID from the master station 11. Then, new configuration information is generated and stored in the configuration information storage unit 2d. The information management unit 1c of the master station 11 stores the configuration information of the terminal station 22 in the configuration information storage unit 1d. Thereafter, the information management unit 1c of the master station 11 performs route calculation, generates route information between the local station and the terminal station 22, and stores it in the route information storage unit 1e. The information management unit 2c of the terminal station 22 collects route information from the master station 11, and the route information storage unit 2e stores the route information of the own station.

  In this way, the terminal station 2 transmits a NetID change request to the terminal station 2 in which the NetID is presumed to be erroneously assigned among the terminal stations 2 belonging to a different management communication network from the own station, It is instructed to perform re-entry processing to the master station 1 after changing the NetID, and it is possible to automatically detect the NetID assignment error at the terminal station 2 and reassign the NetID to the terminal station 2. Thus, even if there is a terminal station 2 to which the master station 1 is assigned an incorrect NetID but the master station 1 cannot monitor communication, the neighboring terminal station 2 can detect an erroneous NetID setting. It is possible to normalize the communication in a local environment that does not go through the communication, and the communication success rate between the master station 1 and the terminal station 2 can be improved.

  Further, the correction interval adjustment unit 1h (see the broken line in FIG. 8) is provided in the terminal station 2, and the domain information change processing unit 2f performs the reassignment process according to the past reassignment number, as in the first embodiment. You may adjust the time interval to perform.

(Embodiment 4)
In the reassignment process of the NetID, (21) the domain information change processing unit 1f of the master station 1 described in the first to third embodiments, the NetID is incorrect among the terminal stations 2 belonging to the same management communication network as the own station. A NetID reset request is transmitted by unicast to the terminal station 2 that is presumed to be allocated. In the terminal station 2 that has received the reset request, the information management unit 2c returns the configuration information of the local station stored in the configuration information storage unit 2d to the default, monitors the H packet on the trunk line Lb, and monitors the master station 1 Perform re-entry processing.
(22) The domain information change processing unit 1f of the master station 1 exceeds the domain of the terminal station 2 that is assumed to have been incorrectly assigned the NetID among the terminal stations 2 belonging to the management communication network different from the own station. A NetID change request is made by communication. In the terminal station 2 that has received the NetID change request, the information management unit 2c changes the NetID of the own station stored in the configuration information storage unit 2d, and performs re-entry processing to the parent station 1 after the change.
(23) The domain information change processing unit 2f of the terminal station 2 sets the NetID of the terminal station 2 that is presumed that the NetID is incorrectly assigned among the terminal stations 2 belonging to the management communication network different from the local station. Make a change request. In the terminal station 2 that has received the NetID change request, the information management unit 2c changes the NetID of the own station stored in the configuration information storage unit 2d, and performs re-entry processing to the parent station 1 after the change.
In addition, there are the following methods (24) to (27).

  (24) The domain information change processing unit 1f of the master station 1 periodically transmits a NetID reset request to all the terminal stations 2 belonging to the same management communication network as the own station by flooding. In the terminal station 2 that has received the reset request, the information management unit 2c returns the configuration information of the local station stored in the configuration information storage unit 2d to the default, monitors the H packet on the trunk line Lb, and monitors the master station 1 Perform re-entry processing.

  (25) The domain information change processing unit 1f of the master station 1 periodically sends a NetID reset request by flooding to all the terminal stations 2 belonging to the same management communication network as the own station. This NetID reset request includes route branch information, and the information management unit 2c of the terminal station 2 that has received the reset request receives the route information of its own station stored in the route information storage unit 2e. Referring to it, it is determined whether or not the branch indicated by the branch information exists in the route of the own station. In the terminal station 2 having the route information including the branch, the information management unit 2c returns the configuration information of the local station stored in the configuration information storage unit 2d to default, and monitors the H packet on the trunk line Lb to Perform re-entry processing to station 1.

  (26) The domain information change processing unit 1f of the master station 1 periodically sends a NetID reset request by flooding to all the terminal stations 2 belonging to the same management communication network as the own station. The NetID reset request includes communication cost information, and the information management unit 2c of the terminal station 2 that has received the reset request refers to its own route information stored in the route information storage unit 2e. Then, it is determined whether or not a branch having a communication cost equal to or greater than the value indicated by the communication cost information exists in the route of the own station. In the terminal station 2 in which the branch of the communication cost equal to or greater than the value indicated by the communication cost information exists in the route of the own station, the information management unit 2c defaults the configuration information of the own station stored in the configuration information storage unit 2d. , The H packet on the trunk line Lb is monitored, and the re-entry process to the master station 1 is performed.

  (27) When the domain information change processing unit 1f of the master station 1 monitors the PLC signal on the trunk line Lb, and the other master station 1 transmits a NetID reset request, the same management communication network as the own station A NetID reset request is transmitted to all the terminal stations 2 belonging to the network, and NetID reallocation processing is executed in cooperation with the entire system.

  The system may be configured by combining a plurality of NetID reallocation processes described in the first to fourth embodiments. In this case, when a reassignment instruction is issued from a plurality of master stations 1 to one terminal station 2, the information management unit 2c of the terminal station 2 belongs to the same management communication network as the own station. The instruction from the master station 1 is given priority. Therefore, even when the reallocation process instructed from the management communication network of the same NetID as the local station and the reallocation process instructed from the management communication network of the NetID different from the local station compete with each other, By giving priority to the reallocation process instructed from the management communication network, more appropriate reallocation processing can be performed.

DESCRIPTION OF SYMBOLS 1 Master station 1b Equipment operation management part 1c Information management part 1d Configuration information storage part 1e Route information storage part 1f Domain information change process part 2 Terminal station 2b Equipment monitoring control part 2c Information management part 2d Configuration information storage part 2e Route information storage part 2f Domain information change processing unit 3 Power measurement device

Claims (5)

A plurality of master stations and a plurality of terminal stations provided with managed devices communicate with each other via a communication path, the master station has different domain information, and the terminal station is one of the master stations. Domain information and address information for identifying a plurality of terminal stations having the same domain information are allocated, and the managed device is allocated the device identification information and allocated to the terminal station to which the managed device is attached. A remote management system managed by a master station having the specified domain information,
The master station includes a configuration information storage unit that registers correspondence between domain information and address information of each terminal station and device identification information of a managed device attached to the terminal station, and domain information and address information in the configuration information storage unit. And a device management unit that communicates with each terminal station using the device identification information to manage the managed device,
At least one of the master station and the terminal station has a domain information change processing unit that performs a process of reallocating the domain information of the terminal station to which incorrect domain information is allocated, and the reassignment process history by the domain information change processing unit Based on the correction interval adjustment unit for adjusting the time interval for performing the reallocation process ,
The first terminal station performs a reassignment process performed by the domain information change processing unit of the master station or the second terminal station assigned the same domain information as the first terminal station, in a domain different from that of the first terminal station. A remote management system characterized in that it is performed in preference to a reallocation process performed by a domain information change processing unit of a master station or a third terminal station to which information is allocated .   The master station includes the domain information change processing unit, and the domain information change processing unit of the master station is a terminal station to which incorrect domain information is assigned among terminal stations to which domain information of the master station is assigned. The remote management system according to claim 1, wherein a process of reallocating the domain information is performed.   The parent station includes the domain information change processing unit, and the domain information change processing unit of the parent station determines the other parent station based on the quality of communication performed by the terminal station assigned the domain information of the other parent station. 2. The terminal station to which incorrect domain information is allocated is detected from the terminal station to which the domain information of the station is allocated, and the process of reallocating the domain information of the detected terminal station is performed. Remote management system. Said end station comprises the domain information change processing unit, domain information change processing unit of the fourth end stations, communications fifth terminal station allocated a different domain information and the fourth end station performs The process according to claim 1, further comprising: detecting a fifth terminal station to which erroneous domain information is assigned based on quality, and reallocating the domain information of the detected fifth terminal station. Remote management system. A plurality of master stations and a plurality of terminal stations provided with managed devices communicate with each other via a communication path, the master station has different domain information, and the terminal station is one of the master stations. Domain information and address information for identifying a plurality of terminal stations having the same domain information are allocated, and the managed device is allocated the device identification information and allocated to the terminal station to which the managed device is attached. A domain information allocating method used in a remote management system managed by a master station having domain information provided,
The master station registers the correspondence between the domain information and address information of each terminal station and the device identification information of the managed device attached to the terminal station, and uses the registered domain information, address information, and device identification information. Communicate with each terminal station to manage managed devices,
At least one of the master station or terminal station performs processing to reassign domain information of the terminal station to which incorrect domain information is assigned, and adjusts the time interval for performing reassignment processing based on the history of this reassignment processing And
The first terminal station is a parent station to which domain information different from that of the first terminal station is assigned by the master station or the second terminal station to which the same domain information as the first terminal station is assigned. Priority is given to reallocation processing performed by the station or the third terminal station.
A domain information allocating method characterized by that.

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