JP2005195307A - Data collection method and relay device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data collection method for adding time information to monitoring data and collecting the same, and a relay device for adding time information to the monitoring data on an air conditioning monitoring system and relaying the same. <P>SOLUTION: In the air conditioning monitoring system, an index giving part 42 of the relay device 4 adds an index number showing the sequence of period in receiving to the monitoring data and records the same every time a transmit/receive part 41 receives the monitoring data, and determines which number the monitoring data is in the predetermined delivery sequence. The index giving part 42 adds one to the index number to be updated when a predetermined time passes, when the delivery order of the monitoring data recorded in the buffer memory 43 is the first, or when the delivery order is the second, and the delivery order of the next monitoring data recorded ahead is not the first, and the index number of the next monitoring data recorded ahead is changed to a new index number. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data collection method in an air conditioning monitoring system and a relay device that relays data on the air conditioning monitoring system.

  In recent years, large-scale facilities such as high-rise buildings can be finely controlled from the conventional centralized monitoring system that centrally manages the facilities and equipment in response to demands for further increase in size and functionality. A distributed monitoring system has been adopted (for example, Patent Document 1). In particular, air conditioner monitoring systems are often installed together at the time of facility construction because they are difficult to modify later.

  By the way, in an air conditioning system consisting of an outdoor unit and a plurality of indoor units having the same piping system as the outdoor unit, a so-called multi-air conditioner, all the indoor units in the same piping system become the central control unit. On the other hand, the control / operation command information is transmitted in a predetermined order at a constant cycle, and the outdoor unit returns the state information of the indoor unit itself as a response.

  FIG. 7 is a diagram showing a configuration of an air conditioning monitoring system 101 for monitoring a conventional air conditioning system. Conventionally, the outdoor unit control device 102 that controls the outdoor unit and the indoor unit control device 103 that controls the indoor unit are connected by a dedicated communication line (air conditioner bus line) to transmit and receive control information and state information. ing. For convenience, a network composed of the outdoor unit control device 102 of the outdoor unit and the indoor unit control unit 103 of the indoor unit existing in the same piping system is referred to as a system (system 1, system 2...).

  The outdoor unit control device 102 and the indoor unit control device 103 of each system are also connected to the relay device 104 by an air conditioner bus line, and the relay device 104 is transmitted and received between the outdoor unit control device 102 and the indoor unit control device 103. Various information is taken in and temporarily recorded in the buffer memory.

  The relay device 104 is connected to the local server 105 by a dedicated communication line (remote monitoring bus line), and various information such as control information and status information once stored in the buffer memory of the relay device 104 is stored in the local server 105. To be aggregated. The various information collected in the local server 105 is transmitted to the center server 106 via the Internet, and the center server 106 monitors the operation status of the outdoor unit and the indoor unit and performs failure diagnosis.

  By configuring the air conditioning monitoring system 101 in this way, a distributed air conditioning system is configured with a small system as a unit for an air conditioning system that tends to be large, such as a high-rise building, and the monitoring is consolidated. It is possible to do it.

  Control information and status information (hereinafter collectively referred to as monitoring data) transmitted and received between the outdoor unit control device 102 and the indoor unit control device 103 are a system address, a device address, and actual data having a predetermined bit length. Consists of The system address is information for identifying each system connected to the relay apparatus 104, and the device address is an address for identifying the outdoor unit control apparatus 102 and the indoor unit control apparatus 103 in each system. Information.

  The actual data includes a data block in which information (room temperature, set temperature, cycle temperature, fan air flow, etc.) from the indoor unit control device 103 is recorded at a predetermined position with a predetermined bit length, It is composed of a data block in which information (compressor speed, outside air temperature, valve opening, current value, etc.) from the machine control device 102 has a predetermined bit length and is recorded at a predetermined position. For example, when transmitting information for changing the opening degree of the valve for adjusting the refrigerant flow rate from the outdoor unit control device 102 to a specific indoor unit control device 103, the specific outdoor unit control device 102 is assigned to the system address and the device address. And a bit value indicating the opening degree of the valve are set at predetermined bit positions of the actual data (in other cases, a bit value “0” indicating invalidity is set, for example).

  As shown in FIG. 8, this monitoring data is transmitted and received in each system with a constant period (t seconds). For example, in FIG. 8, “A request” in system 1 is monitoring data indicating a change in valve opening, etc. transmitted from the outdoor unit control device 102A, and “a1 response” This indicates that the indoor unit control device 103a1 is the monitoring data returned in response to the monitoring data received from the outdoor unit control device 102A. Note that the periods do not need to be synchronized for each system.

  Normally, in the air-conditioning monitoring system 101, as shown in FIG. 8, a request and a response are repeatedly performed in a predetermined order within t seconds for all the indoor unit control devices 103 existing in the system. 104A takes in necessary monitoring data transmitted and received via the air conditioner bus line. However, there may be a case where the request and response are not normally performed due to some cause. For example, as shown in the system 1 of FIG. 9, after a request and a response are made between the outdoor unit control device 102A and the indoor unit control device 103a1, originally, the outdoor unit control device 102A and the indoor unit control device 103a2 A request and a response should be performed, but it is not performed normally for some reason, and if a situation occurs in which monitoring data (request and response indicated by a broken line in FIG. 9) drops out, the buffer memory of the relay apparatus 104A If they are normal, they should be stored in chronological order as shown on the left (normal) in FIG. 10, but “missing” occurs as shown on the right (abnormal) in FIG. In FIG. 10, “A” indicates monitoring data for the outdoor unit control device 102, and “a1 (ax)” indicates monitoring data for the indoor unit control device 103a1 (ax) (FIG. 11). The same applies to.

  Moreover, as shown in the system 2 of FIG. 11, after the request and response of the outdoor unit control device 102B and the indoor unit control device 103b1 are performed, the outdoor unit control device 102B and the indoor unit control device 103b2 in the next cycle When all the monitoring data until the request and response are lost, the monitoring data after b1 in the second cycle is originally stored in the buffer memory of the relay apparatus 104A in one cycle as shown in the right of FIG. It becomes visible as eye monitoring data, and it becomes impossible to know that one period of monitoring data has been lost. Furthermore, there is a possibility that the period of monitoring data may not be known, and the conventional air conditioning monitoring system 101 has poor reliability in terms of “time (order)”.

  In particular, when it is necessary to accurately grasp when and when a failure has occurred and when there is a need to accurately understand the signs that the failure is likely to occur, it is necessary to grasp the operation status of the outdoor unit or indoor unit over time. Therefore, the conventional air-conditioning monitoring system 101 cannot perform monitoring accurately.

  Therefore, it is necessary to add some time information indicating the arrangement of the monitoring data along the time series to the monitoring data output by the outdoor unit control device 102 or the indoor unit control device 103, but it is already installed. In order to improve the conventional outdoor unit control device 102 and the indoor unit control device 103 that have already been used, it cannot be said that it is preferable in terms of cost and work load. Moreover, it cannot be said that it is preferable also from the point of the processing capability of each control apparatus. Therefore, it is appropriate that the relay device 104 performs processing for adding some time information when capturing the monitoring data.

However, as the time information, it is conceivable to use the date and time when the monitoring data is received as it is. For example, if time information such as “2003/12/18 10:18:25” is added, this time The information portion consumes a considerable amount of buffer memory. Since the relay device 104 has a limited capacity, it is desirable that the time information is as small data as possible with a small memory consumption of the buffer memory. Also, it is desirable that the data is as small as possible from the viewpoint of shortening the communication time between the relay device 104 and the local server 105.
Japanese Patent Laid-Open No. 10-98778

  The present invention has been made in view of the above circumstances, and in an air conditioning monitoring system, a data collection method for collecting data by adding an index number indicating the order of cycles at the time of reception to monitoring data, and an air conditioning monitoring system An object of the present invention is to provide a relay device that relays the monitoring data by adding an index number indicating the order of cycles at the time of reception as time information.

  In order to solve the above-described problem, the data collection method according to claim 1 is a data collection method based on a plurality of air conditioners and monitoring data required for monitoring generated and transmitted by the air conditioners. A data collection method in an air conditioning monitoring system comprising: a monitoring device that monitors a state; and a relay device that receives the data from the air conditioning device, temporarily stores the data in a buffer memory, and then transmits the data to the monitoring device via a network. In the plurality of air conditioners, the monitoring data is generated and transmitted from each of the plurality of air conditioners in a predetermined transmission order for each cycle of a predetermined time length, and in the relay device, the monitoring data Each time data is received, an index number indicating the order of the cycles at the time of reception is added to the monitoring data to the buffer memory. After recording, the step of determining the monitoring data sent out in the predetermined sending order, and the sending order of the monitoring data recorded in the buffer memory when the predetermined time has passed or 1 Or when the sending order of the monitoring data recorded in the buffer memory is second and the sending order of the monitoring data recorded immediately before is not first, the step of changing the index number; Obtaining the monitoring data to which the index number is added from the buffer memory and transmitting the data to the monitoring device via a network.

  Further, the relay device according to claim 2 is used for monitoring in an air conditioning monitoring system including a plurality of air conditioning devices and a monitoring device that monitors a state of the air conditioning device based on data generated and transmitted by the air conditioning device. A relay device that relays necessary monitoring data from the air conditioner to the monitoring device, and is generated and sent out from each of the plurality of air conditioners in a predetermined order for each cycle of a predetermined time length. Data receiving means for receiving monitoring data via a network; and index providing means for adding an index number indicating the order of the cycles at the time of reception to the monitoring data received by the data receiving means; Storage means for storing monitoring data to which the index number is added by the index assigning unit; and Wherein acquires monitoring data index number appended, characterized in that it comprises a data transmitting means for transmitting to the monitoring device via the network.

  According to the present invention, by adding an index number to the monitoring data as time information, data indicating in what cycle each monitoring data is sent is added, and the monitoring data is arranged in time series. It is possible to grasp the operating status of the air conditioner over time, correctly identify at which point the failure occurred, how the data before and after it changed, and The data can be used to accurately predict a sign that the failure is likely to occur, such as failure diagnosis.

  An embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, an air-conditioning monitoring system 1 according to this embodiment includes an outdoor unit and an air conditioner composed of the outdoor unit, an outdoor unit control device 2 that controls the outdoor unit, and an indoor unit control unit 3 that controls the indoor unit. , The relay device 4, the local server 5, and the center server 6. The outdoor unit control device 2, the indoor unit control device 3, and the relay device 4 are connected to each other by a dedicated communication line (air conditioner bus line). In addition, the network comprised by the outdoor unit control apparatus 2 and the indoor unit control apparatus 3 which belong to the same piping system is called a system | strain (system | system 1, system | strain 2 ...). The relay device 4 is connected to the local server 5 through a dedicated communication line (remote monitoring bus line), and the local server 5 is connected to the center server 6 via the Internet.

  The outdoor unit control device 2 includes a transmission / reception unit 21 and a control unit 22, and the transmission / reception unit 21 has a function of performing transmission / reception of monitoring data with the indoor unit control device 3 in a predetermined cycle and a predetermined order, In addition, the control unit 22 receives input from various sensors such as a temperature sensor and a function for outputting a control signal for controlling the outdoor unit according to information recorded in the monitoring data received by the transmission / reception unit 21, and receives predetermined information. Has a function of generating monitoring data recorded.

  The indoor unit control device 3 includes a transmission / reception unit 31 and a control unit 32. The transmission / reception unit 31 has a function of transmitting / receiving monitoring data to / from the outdoor unit control device 2, and the control unit 32 transmits / receives data. Accepts inputs from various sensors such as a temperature sensor, a function to output control signals (indoor fan speed, expansion valve opening, etc.) for controlling the indoor unit specified in the monitoring data received by the unit 31; It has a function of generating monitoring data in which predetermined information is recorded in accordance with the monitoring data received from the outdoor unit control device 2.

  The relay device 4 is composed of an electronic component such as an MCU, and includes a transmission / reception unit 41, an index assignment unit 42, a buffer memory 43, and a data transmission unit 44. The transmission / reception unit 41 includes the outdoor unit control device 2 and the indoor unit control device. 3 and the function of performing transmission / reception of monitoring data in a predetermined cycle and in a predetermined order, the index assigning unit 42 includes a timer, and the monitoring data received by the transmitting / receiving unit 41 is time-sequentially for each system. It has a function of adding an index number in order and recording it in the buffer memory 43 (details will be described later). Further, the data sending unit 44 has a function of sending the monitoring data recorded in the buffer memory 43 to the local server 5 at a predetermined cycle.

  The local server 5 includes a data receiving unit 51, a database 52, and a communication unit 53. The data receiving unit 51 has a function of receiving monitoring data transmitted from the relay device 4 and recording it in the database 52. The communication unit 53 has a function of transmitting the monitoring data recorded in the database to the center server 6 collectively to the center server 6 at a predetermined cycle via the Internet.

  The center server 6 includes a communication unit 61, a database 62, a data processing unit 63, and an output unit 64. The communication unit 61 has a function of receiving monitoring data transmitted from the local server 5 and recording it in the database. The data processing unit 63 has a function of monitoring the status of the outdoor units and the indoor units, diagnosing failures, and the like based on the monitoring data recorded in the database 62. The output unit 64 has a function of outputting the processing result of the data processing unit 63 as report data in a predetermined data format.

  Note that the monitoring data generated by the outdoor unit control device 2 and the indoor unit control device 3 is the same as the conventional data, and a detailed description thereof will be omitted. Further, as shown in FIG. 8, the monitoring data is generated by the control units 22 and 32 of the outdoor unit control device 2 and the indoor unit control device 3 in each system, and is transmitted and received by the transmission / reception units 21, 31 and 41. Are transmitted and received in a predetermined order with a fixed period (t seconds), and each device performs a control operation with relevance to this period.

  Next, processing when the relay device 4 receives the monitoring data will be described based on the flowchart of FIG. In addition, the process shown below shall be performed for every system | strain. Therefore, when one relay apparatus 4 receives monitoring data from a plurality of systems, a plurality of the same processes are performed in parallel.

  The index assigning unit 42 of the relay device 4 has “index” as an internal variable, and the variable “index” is data indicating the order of the periods when the monitoring data is received. For example, the data length is 8 bits. If it is, it becomes the value of the serial number from 0 to 255 (from the 0th cycle to the 255th cycle, after 255, it returns to 0).

  First, when starting the process, the index assigning unit 42 of the relay device 4 sets 0 to the variable “index” and initializes the index number (step S01). Subsequently, the index assigning unit 42 resets the timer and starts counting one cycle t + α seconds (α is a very small time) (step S03), and enters a monitoring data reception standby state.

  When the transmission / reception unit 41 of the relay device 4 receives any data via the air conditioner bus line, the index adding unit 42 determines whether the data is monitoring data (step S04). For example, the index assigning unit 42 determines whether the data is from the indoor unit that is the starting point of the period, that is, from the first indoor unit on the address. Specifically, it is determined from the system address and the device address whether or not the monitoring data of the device is in the target system. Normally, the start of the period is facilitated by setting the indoor unit with the communication device address No. 1 in the target system, but a specific number can also be the starting point.

  In step S04, when the received data is not monitoring data, the index assigning unit 42 determines whether one cycle t + α seconds has elapsed (step S05). If t + α seconds have not elapsed, the index assigning unit 42 returns to step S04 and enters a standby state for receiving the next monitoring data.

  If the received data is monitoring data in step S04, the index assigning unit 42 adds an index number to the received monitoring data and records it in the buffer memory 43 (step S06). FIG. 3 shows monitoring data to which index numbers stored in the buffer memory 43 are added. An index number having a predetermined bit length is added to the head of the monitoring data transmitted by the outdoor unit control device 2 or the indoor unit control device 3. That is, the monitoring data is indicated by a data string connected after the index number in FIG. At this stage, since the variable “index” is set to 0 in step S01, the index number is 0.

  Subsequently, the index assigning unit 42 determines whether the received and recorded monitoring data is for the first device as a starting point (step S07). If it is the monitoring data of the starting device in step S07, the process proceeds to step S30 for changing a variable “index” described later. On the other hand, if it is not the monitoring data from the starting device, the index assigning unit 42 determines whether or not a certain time (t + α) has elapsed since the timer started first (step S08).

  If the predetermined time has not elapsed, it is assumed that data communication within one cycle has not been completed, and the index assigning unit 42 determines whether or not the received monitoring data is monitoring data from the second indoor unit. Determination is made (step S09).

  If the received data is the second monitoring data in the communication period within the series of systems, the index assigning unit 42 monitors the previous stored data stored in the buffer memory 43 from the starting indoor unit. It is determined whether it is business data (step S10). Here, the determination whether or not the previous stored data is the monitoring data from the previous indoor unit is for confirming the lack of the monitoring data as the starting point. Is not the monitoring data from the previous indoor unit, it indicates that the starting monitoring data is missing. In this case, since it can be determined that the next communication cycle has already been entered, the process proceeds to the index number changing process after step S30.

  Also, if the data received in step S09 is not the monitoring data from the second indoor unit, or if the previous saved data is the monitoring data from the starting indoor unit in step S10, the data is normally Assuming that monitoring data within the same period has been received, the process returns to step S04 and waits for the next data reception.

  On the other hand, when a certain time (t + α) has elapsed in step S08, that is, when it is considered that data transmission / reception of the devices in the system has been completed and the next new cycle has started, the next step is performed from step S20 to step S22. Change to an index number.

  When changing the index number, the index assigning unit 42 calculates the index number by adding 1 to the value of the current variable “index” (step S20), and then the new index number is set to 256. It is determined whether or not (step S21). If it is 256, the index assigning unit 42 returns the variable “index” to 0 (step S22). This is because the index number is repeatedly given between 0 and 255 as described above.

  Thereafter, the index assigning unit 42 resets and restarts the timer (step S03), and proceeds to a data reception determination process. When the variable “index” is less than 256 in step S21, the index assigning unit 42 proceeds to the processes in steps S03 and S04 while keeping the variable “index” as it is.

  Here, the fixed time (t + α) will be described. A series of communication cycles of the devices 2 and 3 in the system is set to t. Therefore, synchronization can be achieved if there is a limit at a time completely matching this. However, variation in the time count in the electronic control circuit of each device is inevitable. For this reason, it is difficult to obtain perfect synchronization between the relay device 4 and the devices 2 and 3. When the same time t is set for the relay device 4 and the respective devices 2 and 3, an incorrect index number is assigned if the count on the relay device 4 side is shorter than the time count on the device 2 and 3 side. Problem arises.

  Therefore, on the relay device 4 side, a time limit of t + α slightly longer than a series of communication cycles t of the devices 2 and 3 is performed. Here, during the time t + α, as shown in FIG. 8, a series of communications started from the starting device (the indoor unit with device address 1) is completed, and data transmission of the third device in the next series of communications is started. It is set to the time to run. That is, α is a time interval from the communication monitoring of the starting device to the end of communication of the second device. Therefore, when one cycle is completed from the data reception and the data of the starting device and the second device is lost at the start of the next data communication cycle, the timer of t + α time forcibly I try to move to the index number.

  On the other hand, when one cycle is completed from the data reception and the next device starts the data communication, the starting device is lost, and when the data of the second device is received, the data of the starting device is received in step S10. The missing data is detected, and the index number changing process in steps S30 to S32 and the stored data correcting process in step S40 are performed. Even if any data loss occurs during the communication due to the time limit and the order confirmation process, the same index number is always given to the data having the same period.

  The index number changing process in steps S30 to S32 is the same as the process in steps S20 to S22. The case where the process moves to step S30 is the monitoring data of the starting device in step S07, and when the data reception ends one cycle and the next data communication cycle starts, the starting device is missing. Only when the monitoring data of the second device has been received, and in either case, the device data already recorded in step S06 is in the next cycle, but is incorrectly stored with the previous index number. Therefore, the index assigning unit 42 changes the index number assigned to the monitoring data stored in the buffer memory 43 in the same processing cycle to the new index number calculated in steps S30 to S32. (Step S40). If the process is changed so that the monitoring data is recorded after the index correction, the index number correction step for the previous recording data is not necessary.

  In this way, by adding the index number to the monitoring data, it becomes clear in which cycle the individual monitoring data was received. For example, as shown in FIG. 10 system 1, even when monitoring data on the way is lost, the order can be obtained accurately as shown in FIG. 4. Even when the monitoring data is lost for one period or more, the order can be obtained accurately. 4 and 5, the hatched portion indicates missing monitoring data that is not recorded in the buffer memory 43.

  Further, the monitoring data to which the index number is added in this way is sequentially sent from the data sending unit 44 of the relay device 4 to the local server 5 and received by the data receiving unit 51 of the local server 5. Is once recorded in the database 52 and then transmitted from the communication unit 53 to the center server 6, and the communication unit 61 of the center server 6 records the received monitoring data in the database 62.

  The data processing unit 63 of the center server 6 performs outdoor unit and indoor unit state monitoring, failure diagnosis, and the like based on the monitoring data recorded in the database 62. FIG. 6 shows report data generated by the output unit 64 as a result of the state monitoring process performed by the data processing unit 63. Even in the case of taking statistics of the outdoor unit and indoor unit operation status shown in FIG. 6, by adding an index number to the monitoring data, the monitoring data in the same cycle becomes clear, and various statistical data It becomes possible to calculate a more accurate value and improve the accuracy of failure prediction / prediction using these data.

It is a figure which shows the system configuration | structure and functional structure of an air-conditioning monitoring system. It is a flowchart which shows the process sequence of a relay apparatus. It is a figure which shows the data structure of the data for monitoring taken in by an air-conditioning monitoring system. It is a figure which shows the monitoring data stored in a buffer memory. It is a figure which shows the monitoring data stored in a buffer memory. It is a figure which shows the report (report data) output from the center server. It is a figure which shows the structure of the conventional air-conditioning monitoring system. It is a figure which shows the timing of transmission / reception of the monitoring data conventionally performed for every system | strain. It is a figure which shows the timing of transmission / reception of the monitoring data conventionally performed for every system | strain. It is a figure which shows the data for monitoring conventionally stored in the buffer memory. It is a figure which shows the data for monitoring conventionally stored in the buffer memory.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air-conditioning monitoring system 2 Outdoor unit control apparatus 3 Indoor unit control apparatus 4 Relay apparatus 5 Local server 6 Center server 21 Transmission / reception part 22 Control part 31 Transmission / reception part 32 Control part 41 Transmission / reception part 42 Index provision part 43 Buffer memory 44 Data transmission part 51 Data receiving unit 52 Database 53 Communication unit 61 Communication unit 62 Database 63 Data processing unit 64 Output unit 101 Air-conditioning monitoring system (conventional)
102 outdoor unit control device 103 indoor unit control device 104 relay device 105 local server 106 center server

Claims (4)

A plurality of air conditioners, a monitoring device for monitoring the state of the air conditioner based on monitoring data required for monitoring generated and transmitted by the air conditioner, the data received from the air conditioner, and stored in the buffer memory A data collection method in an air-conditioning monitoring system comprising a relay device that temporarily stores and then transmits the monitoring device via a network,
In the plurality of air conditioners,
Generating and sending the monitoring data in a predetermined sending order from each of the plurality of air conditioners for each cycle of a predetermined time length;
In the relay device,
Each time the monitoring data is received, an index number indicating the order of the cycles at the time of reception is added to the monitoring data and recorded in the buffer memory. A step of determining whether the data is sent for monitoring;
When the predetermined time has passed, or when the sending order of the monitoring data recorded in the buffer memory is the first, or the sending order of the monitoring data recorded in the buffer memory is the second and recorded immediately before If the monitoring data transmission order is not the first, the step of changing the index number;
Obtaining monitoring data to which the index number is added from the buffer memory, and transmitting the data to the monitoring device via a network;
A data collection method characterized by comprising: In an air conditioning monitoring system comprising a plurality of air conditioning devices and a monitoring device that monitors the state of the air conditioning device based on data generated and transmitted by the air conditioning device, monitoring data required for monitoring is transmitted from the air conditioning device. A relay device relaying to the monitoring device,
Data receiving means for receiving, via a network, the monitoring data generated and transmitted from each of the plurality of air conditioners in a predetermined transmission order every one cycle of a predetermined time length;
Index adding means for adding an index number indicating the order of the cycles at the time of reception to the monitoring data received by the data receiving means;
Storage means for storing monitoring data to which the index number is added by the index assigning unit;
Data transmission means for acquiring the monitoring data to which the index number is added from the storage means, and transmitting the data to the monitoring device via a network;
A relay device comprising:   The relay apparatus according to claim 2, wherein the index adding unit updates the index number by adding 1 when the predetermined time has elapsed.   The index assigning means determines whether the monitoring data stored in the storage means is the monitoring data sent first in the predetermined sending order, and if the sending order is the first The index number is updated by adding 1 to update the index number of the monitoring data stored in the storage means to the updated new index number. The relay device according to claim 3.

Images