JP2007085610A - Centralized control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centralized control system capable of appropriately performing an operation of each refrigerating/freezing equipment even in a case where abnormality of a communication operation of a parent terminal occurs. <P>SOLUTION: By totally controlling the operations of each of the refrigerating/freezing equipments 1-10 by a backup terminal BT in place of the parent terminal PT when an abnormality in the communication operation of the parent terminal PT occurs, even when an abnormality occurs in the communication operation of the parent terminal PT, the operation of each of the refrigerating/freezing equipments 1-10 is appropriately performed and failure such as giving thermal damage to a commodity can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a centralized management system that manages operation of a plurality of refrigeration equipment having child terminals in a centralized manner by a parent terminal.

  This type of centralized management system includes a child terminal provided in each of a plurality of refrigeration equipment including a refrigerated showcase, a freezer with a door, and the like, and a parent terminal connected to each child terminal via a communication line.

In this system, various settings for each refrigeration equipment, such as cooling temperature, cooling time zone, defrosting time zone, defrosting completion temperature, lighting time zone, etc., are collectively performed at the parent terminal, and each set value is set. It can be transmitted from the parent terminal to the child terminal of each refrigeration equipment through a communication line. Each refrigeration equipment performs operations such as cooling and defrosting based on the set value transmitted from the parent terminal to the child terminal. In addition, the parent terminal can collectively grasp operational abnormalities and the like that have occurred in each refrigeration equipment based on the operation state data transmitted from each child terminal to the parent terminal through the communication line.
JP-A-9-119767

  The system is operated by data communication between a parent terminal and a child terminal of each refrigeration refrigerator device, but since the main entity in system operation is the parent terminal, each abnormality occurs in the communication operation of the parent terminal. Operations such as cooling and defrosting in a refrigerated refrigerator cannot be performed normally. Also, if an abnormality occurs in the communication operation of the parent terminal, it becomes impossible to grasp the operation abnormality in each refrigerated refrigeration equipment in a timely manner, so in the elapsed time until the abnormality is confirmed on each refrigerated refrigeration equipment side Problems such as thermal damage to products may occur.

  The present invention was created in view of the above circumstances, and the object of the present invention is to provide a centralized management system capable of appropriately operating each refrigerated refrigeration apparatus even when an abnormality occurs in the communication operation of the parent terminal. It is in.

  In order to achieve the above-mentioned object, the present invention provides a parent terminal that enables mutual communication between a child terminal provided in each of a plurality of refrigeration units and each child terminal, and manages the operation of the plurality of refrigeration units. A monitoring means for monitoring the communication state between each child terminal and the parent terminal, and a plurality of refrigeration on behalf of the parent terminal when an abnormality occurs in the communication operation of the parent terminal. It is characterized by comprising a spare terminal having management means for managing the operation of the refrigeration equipment in an integrated manner.

  According to this centralized management system, when an abnormality occurs in the communication operation of the parent terminal, the operation of each refrigeration unit can be managed by the spare terminal in place of the parent terminal, so there is an abnormality in the communication operation of the parent terminal. Even if it occurs, it is possible to prevent inconveniences such as proper operation of each refrigerated refrigeration equipment and thermal damage to the product.

  According to the present invention, it is possible to provide a centralized management system capable of appropriately operating each refrigeration equipment even when an abnormality occurs in the communication operation of the parent terminal.

  The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.

  1 to 7 show an embodiment of the present invention. First, the overall configuration of the centralized management system will be described with reference to FIG.

  In FIG. 1, 1 to 10 are refrigerated refrigerators, ST1 to ST10 are child terminals provided in each refrigerated refrigerators 1 to 10, 21 and 22 are shared refrigerators, and ST21 and ST22 are shared refrigerators 21 and 22, respectively. The provided child terminal, BT is a spare terminal, PT is a parent terminal, RP1 and RP2 are refrigerant pipes, and L1 and 2 are communication lines.

  Each refrigeration equipment 1-10 consists of a refrigerated showcase, a freezer with a door, etc., and is installed in the predetermined position in a store. Of the 10 refrigerated refrigerators 1 to 10, eight refrigerated refrigerators 1, 2, 4, 5, 6, 7, 9, and 10 are expansion means, evaporators, and interiors of capillary tubes and expansion valves. Refrigeration refrigeration with a freezer that has at least a temperature controller and an illuminator (both not shown) including a circulation fan, an internal temperature sensor, a defrost heater, and a solenoid valve that controls refrigerant flow into the evaporator, etc. Equipment. Of the 10 refrigerated refrigerators 1 to 10, the remaining two refrigerated refrigerators 3 and 8 are compressors, condensers, condenser fans, expansion means consisting of capillary tubes and expansion valves, evaporators, and interiors. It is a refrigerator built-in type refrigeration apparatus including at least a temperature controller including a circulation fan, an internal temperature sensor, a defrosting heater, and the like and an illuminator (all not shown). In the refrigerator-freezer refrigeration equipment using the electronic expansion valve as the expansion means, the refrigerant flow into the evaporator can be controlled by the electronic expansion valve, so no electromagnetic valve is required. .

  Each of the common refrigerators 21 and 22 includes a compressor, a condenser, a condenser fan, and the like (all not shown). The refrigerant inlet / outlet (not shown) of one common refrigerator 21 is connected to the refrigerant inlet / outlet (not shown) of the four refrigerator-freezer units 1, 2, 4, 5 through the refrigerant pipe RP1 having a forward path and a return path. The refrigerant inlet / outlet (not shown) of the other shared refrigerator 22 is connected to the refrigerant inlet / outlet of the four refrigerator-freezers 6, 7, 9, 10 of the refrigerator common type via the refrigerant pipe RP2 having the forward path and the return path. (Not shown).

  Further, the child terminals ST1 to ST5 of the five refrigeration refrigerators 1 to 5 and the child terminal ST21 of one shared refrigerator 21 are connected to the spare terminal BT and the parent terminal PT via the communication line L1, and the remaining five terminals. The child terminals ST6 to ST10 of the refrigerated refrigerator devices 6 to 10 and the child terminal ST22 of the other shared refrigerator 22 are connected to the spare terminal BT and the parent terminal PT via the communication line L2.

  Next, with reference to FIG. 2, the structure of child terminal ST1-ST10 provided in each refrigeration equipment 1-10 is demonstrated.

  Each of the child terminals ST1 to ST10 includes a control unit 101 having a computer configuration, an input unit 102, a display unit 103, a temperature controller driving unit 104, an illuminator driving unit 105, a detection unit 106, and a communication unit 107. Is provided.

  The control unit 101 is a program for controlling operations such as cooling and defrosting in each refrigeration refrigerator 1 to 10, a program for controlling communication with the parent terminal PT and the spare terminal BT, and necessary for the operation. Data, communication protocol, etc. are saved.

  The input unit 102 includes at least an illumination changeover switch (not shown) and a cooling changeover switch (not shown), and display associated with the operation of the illumination changeover switch and the cooling changeover switch is performed on the display unit 103.

  The temperature controller driving unit 104 drives the temperature controller provided in each refrigeration refrigerator 1-10. That is, in the refrigerator-freezer refrigeration equipment 1, 2, 4, 5, 6, 7, 9, 10, the solenoid valve is opened and closed (in the case of a refrigeration equipment using an electronic expansion valve, the electronic type Control of refrigerant flow into the evaporator by adjusting the opening of the expansion valve, on / off control of the fan for circulation inside the cabinet, and on / off control of the defrost heater, etc. Performs variable capacity control of the compressor, on / off control of the condenser fan, on / off control of the internal circulation fan, and on / off control of the defrosting heater. The illuminator driving unit 105 performs on / off control of illuminators (not shown) provided in each of the refrigeration refrigerators 1 to 10.

  The internal temperature sensor 108, the fire detection sensor 109, the evaporator temperature sensor 110, the machine room temperature sensor 111, and the liquid level detection sensor 112 of the evaporating dish are connected to the connector 106a of the detection unit 106, and the sensors 108 to 112 are connected. The detection signal is sent to the control unit 101 through the detection unit 106.

  A communication line L1 or L2 is connected to the connector 107a of the communication unit 107, and the operation state recognized by the control unit 101 by the sensors 108 to 112 or the like is transmitted from the control unit 101 to the communication line L1 or the operation state data. The data is transmitted to the spare terminal BT and the parent terminal PT through L2.

  Next, with reference to FIG. 3, the structure of child terminal ST21, ST22 provided in each common refrigerator 21 and 22 is demonstrated.

  Each of the child terminals ST21 and ST22 includes a control unit 201 having a computer configuration, an input unit 202, a display unit 203, a temperature controller driving unit 204, a detection unit 205, and a communication unit 206.

  The control unit 201 is a program for controlling the operation of each of the shared refrigerators 21 and 22, a program for controlling communication with the parent terminal PT and the spare terminal BT, data necessary for operation, a communication protocol, etc. Is saved.

  The temperature controller driving unit 204 drives the temperature controller provided in each of the common refrigerators 21 and 22. That is, variable capacity control of the compressor and on / off control of the condenser fan are performed.

  The connector 205a of the detection unit 205 is connected with a discharge refrigerant temperature sensor 207, a suction refrigerant temperature sensor 208, a discharge refrigerant pressure sensor 209, a suction refrigerant pressure sensor 210, and an overcurrent detection sensor 211 of the compressor motor. Detection signals from the sensors 207 to 211 are sent to the control unit 201 through the detection unit 205.

  A communication line L1 or L2 is connected to the connector 206a of the communication unit 206, and the operation state recognized by the control unit 201 by the sensors 207 to 211 or the like is transmitted from the control unit 201 to the communication line L1 or the operation state data. The data is transmitted to the spare terminal BT and the parent terminal PT through L2.

  Next, the configuration of the spare terminal BT will be described with reference to FIG.

  The spare terminal BT includes a control unit 301 having a computer configuration, an input unit 302, a display unit 303, a communication unit 304, and an alarm unit 305.

  The control unit 301 replaces the parent terminal PT when an abnormality occurs in a program for monitoring the communication state between each of the child terminals ST1 to ST20, ST21 and ST22 and the parent terminal PT, or when the communication operation of the parent terminal PT occurs. A program for managing the operation of each of the refrigeration refrigerators 1 to 10 and the shared refrigerators 21 and 22, data necessary for the operation, a communication protocol, and the like are stored.

  Communication lines L1 and L2 are connected to the connector 304a of the communication unit 304. The operation state data transmitted from each of the child terminals ST1 to ST10, ST21 and ST22 to the standby terminal BT through the communication lines L1 and L2 is the control unit 301. Is remembered.

  Connector 305a of alarm unit 305 is an alarm device (not shown) such as a buzzer, a lamp, a confinement alarm operated when a store clerk is trapped in a stocker type refrigeration unit, a fire sensor installed outside, etc. This is for connecting an abnormality detection sensor (not shown).

  Next, the configuration of the parent terminal PT will be described with reference to FIG.

  The parent terminal PT includes a computer configuration control unit 401, an input unit 402, a display unit 403, a communication unit 404, and an alarm unit 405.

  The control unit 401 performs a program for managing the operation of each refrigeration refrigerator 1 to 10 and each common refrigerator 21 and 22 and communication between the slave terminals ST1 to ST20, ST21 and ST22 and the spare terminal BT. It stores programs for control, data necessary for operation, communication protocols, and so on.

  The input unit 402 is for setting various settings for each refrigeration refrigerator 1 to 10, for example, a cooling temperature, a cooling time zone, a defrosting time zone, a defrosting completion temperature, an illumination time zone, and the like. Is appropriately displayed on the display unit 403. Each setting value set using the input unit 402 and the display unit 403 is stored in the control unit 401.

  Communication lines L1 and L2 are connected to the connector 404a of the communication unit 404, and each set value set using the input unit 402 and the display unit 403 is transmitted from the control unit 401 through the communication lines L1 and L2. The data is transmitted to terminals ST1 to ST20 and spare terminal BT. Further, the operation state data transmitted from each of the child terminals ST1 to ST10, ST21 and ST22 to the parent terminal PT through the communication lines L1 and L2 is stored in the control unit 401.

  Connector 405a of alarm unit 405 is installed outside, such as an alarm device (not shown) such as a buzzer or lamp installed outside, a confinement alarm operated when a store clerk is trapped in a stocker-type refrigeration equipment, or the like This is for connecting an abnormality detection sensor (not shown) such as a fire sensor.

  Next, the operation of the above-described centralized management system will be described.

  Various settings for each of the refrigerated refrigerators 1 to 10, for example, the setting of the cooling temperature, the cooling time zone, the defrosting time zone, the defrosting completion temperature, the lighting time zone, etc., use the input unit 402 and the display unit 403 of the parent terminal PT. Is set. The set value for each refrigerated refrigerator 1 to 10 is stored in the control unit 401 and transmitted from the controller 401 to the child terminals ST1 to ST10 of the refrigerated refrigerators 1 to 10 through the communication lines L1 and L2. The set value is also transmitted from the control unit 401 to the spare terminal BT through the communication lines L 1 and L 2 and stored in the control unit 301.

  Each refrigerated refrigerator 1 to 10 stores the set value transmitted from the parent terminal PT to each of the child terminals ST1 to ST10 in the control unit 101, and each refrigerated refrigerator 1 to 10 based on the set value by itself. Perform cooling and defrosting operations according to the program you own. Each refrigeration equipment 1-10 recognizes its own operating state in the control unit 101 based on the detection signals of the sensors 108-112, and uses the recognized operating state as operating state data via the communication lines L1, L2. Transmit to BT and parent terminal PT.

  The parent terminal PT stores the operation state data transmitted from each of the child terminals ST1 to ST10 through the communication lines L1 and L2 in the control unit 401, and the spare terminal BT also stores the same data in the control unit 301. The parent terminal PT recognizes the operation state of each of the refrigeration equipment 1 to 10 based on this operation state data, and performs a treatment according to the recognized content. For example, when it is recognized that an operation abnormality has occurred in any one of the refrigeration refrigerators 1 to 10, the display unit 403 and the display unit 103 of the refrigeration refrigerator apparatus in which the operation abnormality has occurred can display the abnormality content. I do.

  The shared refrigerators 21 and 22 recognize their own operating state in the control unit 201 based on the detection signals of the sensors 207 to 211, and use the recognized operating state as operating state data via the communication lines L1 and L2, and the spare terminals BT and BT. Transmit to the parent terminal PT.

  The parent terminal PT stores the operating state data transmitted from the child terminals ST21 and ST22 through the communication lines L1 and L2 in the control unit 401, and the spare terminal 301 also stores the data in the control unit 301. The parent terminal PT recognizes the operation state of each of the shared refrigerators 21 and 22 based on the operation state data, and performs a treatment according to the recognized content. For example, when it is recognized that an operation abnormality has occurred in either of the common refrigerators 21 and 22, the display unit 403 and the display unit 203 of the common refrigerator in which the operation abnormality has occurred can display the abnormality content. I do.

  Under the system operation by the parent terminal PT, the spare terminal BT monitors the communication state between the child terminals ST1 to ST10 of the refrigeration equipment 1 to 10 and the parent terminal PT, and there is an abnormality in the communication operation of the parent terminal PT. It is determined whether or not it has occurred (steps S1 and S2 in FIG. 6).

  As described above, the data transmitted from the parent terminal PT to each of the child terminals ST1 to ST10 and the data transmitted from each of the child terminals ST1 to ST10 to the parent terminal PT are all transmitted to the spare terminal BT. Therefore, a state that cannot occur during normal system operation, for example, (1) the parent terminal PT has not performed communication for a predetermined time (for example, 2 hours), (2) the cooling command has exceeded a predetermined time (for example, 12 hours) (3) The defrost command continues to be issued after a predetermined time (for example, 2 hours), (4) The repetitive cycle of the cooling command and the defrost command exceeds the predetermined number of times (for example, 5 times) (5) By recognizing that the parity bit, checksum, etc. of the communication data do not match, it can be determined that an abnormality has occurred in the communication operation of the parent terminal PT.

  When it is determined that there is an abnormality in the communication operation of the parent terminal PT, a command to stop the communication operation in the parent terminal PT is sent from the spare terminal BT to the parent terminal SP, and the communication operation of the parent terminal PT is performed. An alarm for recognizing that an abnormality has occurred is output (steps S3 and S4 in FIG. 6). The alarm here includes a display on the display unit 304 of the spare terminal BT, an operation of an alarm device connected to the connector 305a of the alarm unit 305, and the like. With this alarm, the system administrator can immediately grasp the occurrence of an abnormality, and can quickly start an inspection or repair for eliminating the communication abnormality of the parent terminal PT.

  Since a considerable amount of time is required for inspection, repair, and the like for eliminating the communication abnormality of the parent terminal PT, the spare terminal BT takes the place of the parent terminal PT until the abnormality of the communication is resolved. As described above, since all communication data when there is no abnormality in the communication operation of the parent terminal PT is stored in the control unit 301 of the spare terminal BT, the spare terminal BT is stored in the control unit 301. The communication data is read (step S5 in FIG. 6), and control is performed so that the operation before the abnormality in the communication operation of the parent terminal PT can be continuously performed in each refrigeration refrigerator 1 to 10 based on the read communication data. Do.

  That is, after reading the communication data stored in the control unit 301, it is determined whether the operation of each refrigeration unit 1-10 is cooling defrosting (step S6 in FIG. 6). If there is, the cooling operation before the abnormality occurs in the communication operation of the parent terminal PT can be continuously performed in each refrigeration refrigerator 1 to 10 (step S7 in FIG. 6). The defrosting operation before the abnormality occurs in the communication operation of the parent terminal PT can be continuously performed in each refrigeration equipment 1 to 10 (step S8 in FIG. 6).

  When the communication abnormality of the parent terminal PT is resolved by inspection or repair, an instruction to restore the communication operation in the parent terminal PT is input to the spare terminal BT using the input unit 303 (steps S9 to S11 in FIG. 6). ). Further, since the elapsed data from the stop of the communication operation in the parent terminal PT until the recovery is stored in the control unit 301 of the spare terminal BT, the elapsed data is transmitted to the parent terminal PT at the time of recovery (FIG. 6). Step S12). The parent terminal PT stores the progress data transmitted from the spare terminal BT in the control unit 401 and reflects it in subsequent operation management.

  In this way, the standby terminal BT takes the place of the parent terminal PT until the communication abnormality of the parent terminal PT is resolved, but an abnormality may occur in the communication operation of the spare terminal BT during this period. Therefore, under the system operation by the spare terminal BT, the child terminals ST1 to ST10 of the respective refrigeration refrigerators 1 to 10 monitor the communication state between the child terminals ST1 to ST10 and the spare terminal BT, and the communication operation of the spare terminal BT. Whether or not an abnormality has occurred is determined by the same method as described above (steps S21 and S22 in FIG. 7).

  If it is determined that there is no abnormality in the communication operation of the spare terminal BT, the monitoring is continued. If it is determined that there is an abnormality in the communication operation of the spare terminal BT, the communication with the spare terminal BT is continued. While interrupting (rejecting) the communication, an alarm for recognizing that an abnormality has occurred in the communication operation of the spare terminal BT is output (steps S23 and S24 in FIG. 7). The warning here includes a display on the display unit 103 of the child terminals ST1 to ST10 of the refrigeration units 1 to 10. Of course, if the child terminals ST1 to ST10 of the respective refrigeration refrigerators 1 to 10 are configured to be able to drive an alarm device such as a buzzer or a lamp, an alarm can be issued by the operation of the alarm device. With this alarm, the system administrator can immediately grasp the occurrence of abnormality, and can quickly start inspection, repair, etc. to eliminate the communication abnormality of the spare terminal BT.

  Since a considerable amount of time is required for inspection, repair, etc. to eliminate the communication abnormality of the spare terminal BT, each refrigeration unit 1-10 is in the current operation mode until the communication abnormality is eliminated. Temporary isolated operation is performed according to the above.

  That is, after outputting the alarm, each refrigeration refrigerator 1 to 10 determines whether its operation is cooling defrosting (step S25 in FIG. 7). The cooling operation before the occurrence of an abnormality in the BT communication operation can be continuously performed in each refrigeration refrigerator 1 to 10 (step S26 in FIG. 7). In the case of defrosting, the communication operation of the spare terminal BT The defrosting operation before the occurrence of an abnormality is continuously performed by each refrigeration equipment 1-10 (step S27 in FIG. 6).

  When the communication abnormality of the spare terminal BT is resolved by inspection or repair, an instruction to restore communication with the spare terminal BT is input to the spare terminal BT using the input unit 303 (steps S28 and S29 in FIG. 7). , S30). Further, since the elapsed data from the time when the communication with the spare terminal BT is interrupted until the restoration is made is stored in the control unit 101 of each of the child terminals ST1 to ST10, the elapsed data is transmitted to the spare terminal BT at the time of restoration ( Step S31 in FIG. Of course, when the parent terminal PT is restored when the spare terminal BT is restored, the progress data may be transmitted to the parent terminal PT.

  Thus, according to the above-described centralized management system, when abnormality occurs in the communication operation of the parent terminal PT, the operation of each refrigeration unit 1-10 is managed by the spare terminal BT in place of the parent terminal PT. Therefore, even when an abnormality occurs in the communication operation of the parent terminal PT, it is possible to prevent problems such as the operation of each of the refrigeration / freezing devices 1 to 10 and causing thermal damage to the product.

  Further, when an abnormality occurs in the communication operation of the parent terminal PT, an alarm can be output by the spare terminal BT, so that the system administrator can immediately grasp the occurrence of the abnormality by this alarm, and the communication error of the parent terminal PT It is possible to quickly start inspections and repairs to solve the problem.

  Further, when an abnormality occurs in the communication operation of the parent terminal PT, the operation before the abnormality occurs can be continuously performed using communication data before the abnormality occurs in the communication operation of the parent terminal PT, so that cooling, defrosting, etc. Thus, various problems that may occur when the operation is normally performed and cannot be performed normally can be prevented.

  Further, when the spare terminal BT supervises the operation of each refrigerated refrigeration equipment 1-10 in place of the parent terminal PT, if any abnormality occurs in the communication operation of the spare BT, the refrigeration refrigeration equipment 1 10 performs temporary independent operation according to the current operation mode, so that the operation of each refrigeration unit 1 to 10 can be performed without any trouble even during the period until communication with the spare terminal BT is restored. Can do.

  In the embodiment described with reference to FIG. 1 to FIG. 7, a system having 10 refrigerated refrigerators 1 to 10 and two shared refrigerators 21 and 22 is illustrated. There are no particular restrictions on the number of units, and the same effects as described above can be obtained even in a system configuration in which the number of refrigerated refrigerators is 11 or more or 9 or a system configuration in which the number of shared refrigerators is 3 or more or 0. Can be obtained.

  Further, the system in which the spare terminal BT and the parent terminal PT are configured as separate devices has been illustrated. However, the same effect can be obtained even if the spare terminal BT and the parent terminal PT are combined into a single device. Needless to say.

It is a block diagram of the centralized management system which shows one Embodiment of this invention. It is a block diagram of child terminal ST1-ST10 shown in FIG. It is a block diagram of child terminal ST21, ST22 shown in FIG. FIG. 2 is a configuration diagram of a spare terminal BT illustrated in FIG. 1. FIG. 2 is a configuration diagram of a parent terminal PT shown in FIG. 1. It is a flowchart of substitution management by the spare terminal BT. It is a flowchart of provisional operation by child terminal ST1-ST10 of each refrigeration equipment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1-10 ... Refrigerated refrigerator equipment, ST1-ST10 ... Child terminal provided in each refrigerated refrigerator equipment, 21, 22 ... Shared refrigerator, ST21, ST22 ... Child terminal provided in each shared refrigerator, BT ... Spare terminal , PT: parent terminal, RP1, RP2: refrigerant pipe, L1, L2: communication line.

Claims (4)

A centralized management system comprising a child terminal provided in each of a plurality of refrigeration devices and a parent terminal that enables mutual communication with each child terminal and manages the operation of the plurality of refrigeration devices.
Monitoring means for monitoring the communication state between each child terminal and the parent terminal, and management for managing the operation of a plurality of refrigeration equipment on behalf of the parent terminal when an abnormality occurs in the communication operation of the parent terminal And a spare terminal having means,
Centralized management system characterized by that. The spare terminal has alarm means for outputting an alarm when an abnormality occurs in the communication operation of the parent terminal.
The centralized management system according to claim 1. The spare terminal has storage means for storing communication data before an abnormality occurs in the communication operation of the parent terminal,
The management means reads the communication data before the abnormality occurs from the storage means when an abnormality occurs in the communication operation of the parent terminal, and takes over the overall management of the operation of each refrigeration equipment based on the communication data,
The centralized management system according to claim 1 or 2, characterized in that Each child terminal has a monitoring means for monitoring a communication state with the spare terminal, and a provisional operation in which the slave terminal performs a provisional single operation according to the current operation mode when an abnormality occurs in the communication operation of the spare terminal. Having means,
The centralized management system according to any one of claims 1 to 3.

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