JP2000146269A - Centralized controller of apparatus such as cooling storage shed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform the centralized control of apparatuses installed in plural numbers by contriving the communization in control. SOLUTION: This centralized controller is equipped with a signal line 22 wired to apparatuses installed in plural numbers, a personal computer P connected to the signal line 22, and a sensor connected to the signal line 22, and the sensor has a detection element, a storage means possessing its own ID code, a transmission and reception means for performing the transfer of data with the personal computer through the signal line, and a control means on sensor side for taking in the data detected by the detection element and writing it in the storage means and sending the data within the storage means to the personal computer P by the transmission means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centralized control device for a refrigerator for home use, a low-temperature showcase, a prefabricated refrigerator, a cooling storage such as a vending machine, an air conditioner, and other devices.

[0002]

2. Description of the Related Art Conventionally, for example, a commercial refrigerator incorporates a compressor, a condenser, a cooler and the like constituting a cooling device, or a compressor and a condenser are separately provided, and a refrigerant discharged from the compressor is provided. Is condensed in a condenser and decompressed by a decompression device, and then supplied to a cooler to exert a cooling effect.The cool air cooled by the cooler is circulated in a refrigerator by a cooling fan to a predetermined temperature. Cooling to low temperature.

Further, a condenser fan is installed around the compressor and the condenser, and the condenser and the compressor are air-cooled by the condenser fan.

[0004]

In such a cooling storage, temperature sensors are mounted according to various uses such as control of the temperature in the storage or protection of a compressor or a condenser, and the number of the sensors varies depending on the model. In addition, the number of fans and the number of dew-prevention heaters for preventing dew condensation differ depending on the model, so the wiring of the electrical system including switches that control them and the configuration of the control device that controls these also differ depending on the model. come. For this reason, especially in the case of commercial equipment produced in small quantities by other models, the productivity has been remarkably reduced, and improvement has been desired.

Conventionally, the temperature of these cooling storages is controlled individually, so that there is a problem that the management becomes extremely complicated when a plurality of cooling storages are installed.

[0006] The present invention has been made to solve the above-mentioned conventional technical problems, and the centralization of equipment such as a plurality of cooling storages is smoothly performed by sharing control. It is intended to provide a centralized control device which can be performed in a short time.

[0007]

According to a first aspect of the present invention, there is provided a centralized control device comprising a plurality of devices, a signal line respectively wired to these devices, and an external device connected to a signal line of each device. A control device, and a sensor connected to the signal line, wherein the sensor includes a detection element, a storage device having its own ID code, and a transmission / reception device for exchanging data with an external control device via the signal line. And a sensor-side control means for taking in the data detected by the detection element, writing the data in the storage means, and transmitting the data in the storage means to the external control device by the transmission / reception means.

According to a second aspect of the present invention, there is provided a centralized control device comprising a plurality of devices, a signal line wired to each of the devices, an external control device connected to a signal line of each device, and a signal line. And a switching element for controlling the operation of the device, the switching element being a switching means, a storage means having its own ID code, and a transceiver for transmitting and receiving data to and from an external control device via a signal line. Means, and switching element side control means for controlling the switching means based on the data from the transmission / reception means.

A centralized control device according to a third aspect of the present invention provides a centralized control device comprising a plurality of devices, a signal line wired to each of the devices, an external control device connected to the signal line of each device, and a signal line. And a switching element connected to the signal line and controlling the operation of the device,
The sensor includes a detection element, storage means having its own ID code, transmission / reception means for transmitting / receiving data to / from an external control device via a signal line, and data detected by the detection element and written into the storage means, A sensor-side control unit for transmitting data in the storage unit to the external control device by the transmission / reception unit, wherein the switching element includes: a switching unit; a storage unit having its own ID code; The transmission / reception means for transmitting / receiving data to / from the apparatus, and the switching element-side control means for controlling the switching means based on data from the transmission / reception means.

A centralized control device according to a fourth aspect of the present invention includes a cooling device including a compressor and the like, a plurality of cooling storages, signal lines respectively wired to these cooling storages, and a cooling storage for each cooling storage. An external control device connected to the signal line, a temperature detection sensor connected to the signal line, and a switching element connected to the signal line and controlling operation of a compressor or the like, the sensor includes a temperature detection element and , Storage means having its own ID code,
Transmitting and receiving means for transmitting and receiving data to and from an external control device via a signal line, and a sensor for receiving the temperature data detected by the temperature detecting element and writing the data in the storage means, and transmitting the data in the storage means to the external control device by the transmitting and receiving means Side control means, and the switching element comprises: a switching means;
It has storage means holding its own ID code, transmitting and receiving means for transmitting and receiving data to and from an external control device via a signal line, and switching element side control means for controlling switching means based on data from the transmitting and receiving means. Is what you are doing.

According to the first, third and fourth aspects of the present invention, the sensor-side control means of the sensor of the equipment such as each cooling storage unit writes the data detected by the detection element or the temperature detection element into the storage means. Since the data is transmitted to the external control device via the signal line by the transmission / reception means, the external control device can take in the temperature data of the devices such as the respective cooling storages without any trouble.

In this case, the sensor stores its own I
Since the D code is held, the external control device can identify the sensor by connecting the sensor to the signal line, and the wiring of the sensor is completed.

According to the second, third and fourth aspects of the present invention, the switching element side control means of the switching element is based on data from the external control device received by the transmission / reception means via the signal line. Since the switching means is controlled, the external control device can control devices such as the compressor of the cooling storage without any trouble.

Also in this case, since the switching element has its own ID code in the storage means, the external control device can identify the switching element by connecting the switching element to the signal line, and the switching element can be identified. Wiring is completed.

Thus, according to the present invention, it is possible to wire a sensor and a switching element by a so-called plug-in, and it is possible to considerably simplify the wiring. In addition, the common software can be used for the external control device irrespective of the number of devices such as cooling storages, the number of sensors and the number of switching elements, and the like, so that the cost can be significantly reduced by common use.

Devices such as compressors of a plurality of cooling storages are centrally controlled by an external control device. Therefore, for example, the compressors of the respective cooling storages are not started simultaneously when they are started, but are started at different timings. Demand control is also possible, which can contribute to power leveling and the like.

Further, the centralized control device of the invention according to claim 5 is:
In each of the above inventions, the sensor and / or the switching element are provided with a power storage element that performs charging while the signal line is at a high potential and discharges while the signal line is at a low potential to supply power to each unit. It is characterized by.

According to the fifth aspect of the present invention, in addition to the above, each of the sensor and the switching element performs charging while the signal line is at a high potential and discharges while the signal line is at a low potential. Since it has a storage element that supplies the power of the means,
The sensor or the switching element operates with power from a signal line for transmitting and receiving data. Therefore, the wiring is completed only by connecting the sensor or the switching element to the signal line without connecting the sensor or the switching element to the power supply line, so that the wiring by plug-in can be further simplified. It becomes something.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view of a commercial refrigerator 1 as an embodiment to which the present invention is applied, and FIG. 2 is a wiring diagram of an electric system of the refrigerator 1. In FIG. 1, a refrigerator 1 has a main body 5 composed of a heat insulating box 2 opening to the front, and a storage room 3 inside the heat insulating box 2. The front opening of the storage room 3 is closed by a door 4 so that it can be opened and closed. In the storage room 3, a cooler 6 constituting a refrigeration cycle of the cooling device and a cooling fan 7 driven by a motor are provided. In addition, an anti-condensation heater 8 for preventing dew condensation is provided at an opening edge of the heat-insulating box 2, and an operation panel 11 of a control box 9 as main control means is mounted on a front surface of the door 4.

On the other hand, a machine room 12 is formed below the heat-insulating box 2, and in the machine room 12, the compressor 1 constituting a refrigerating cycle of a cooling device together with the cooler 6 is provided.
3, a condenser 14, a condenser fan 16, and the like.

When the compressor 13 is operated, the high-temperature and high-pressure refrigerant discharged from the compressor 13 radiates heat in the condenser 14 to be condensed. Is done. In the cooler 6, the refrigerant evaporates and exerts a cooling function. Thereafter, the low-temperature gas refrigerant returns to the compressor 13 again. When the cooling fan 7 is operated, the cool air cooled by the cooler 6 is circulated into the storage room 3, whereby the storage room 3 is cooled. In addition, when the condenser fan 16 is operated, outside air flows through the condenser 14 and the compressor 13, so that these are air-cooled. Further, when the dew-proof heater 8 is energized, the opening edge of the heat insulating box 2 is heated to prevent dew condensation.

Next, in FIG. 2, reference numeral 21 denotes an AC power supply line wired in the main body 5 of the refrigerator 1, and reference numeral 22 denotes a signal line for transmitting and receiving data. AC power line 21 and signal line 22
Is connected to the control box 9,
The drive board 23 of the compressor 13, the fans 7, 1
6 power supply board 24 and the power supply board 26
Is connected to the AC power line 21.

The signal line 22 has a chip-shaped temperature sensor 27 as a sensor and chip-shaped switching elements 28 attached to the drive board 23 and the power supply boards 24 and 26 via connectors. Connected. The power supply board 24 includes a switching element 28.
Are actually provided for the fans 7 and 16 respectively.

In the embodiment, the drive board 23 and the power supply boards 24 and 26 are composed of the compressor 13, the fans 7, 1
6 and the dew-proof heater 8, the drive board 23 and the power supply boards 24 and 26 are combined with the respective switching elements 28 together with the compressor 1
3, a configuration in which each of the fans 7 and 16 and the dew-proof heater 8 are built in may be used.

According to this configuration, the wiring is completed only by connecting the switching elements 28 built in the compressor 13, the fans 7, 16 or the dew-proof heater 8 to the connector of the signal line 22, so that the assembly is completed. -Wiring workability is further improved.

The structure of the control box 9 is shown in FIG.
Shown in The control box 9 is provided with a controller (substrate) 36. This controller 36
It comprises a CPU (microcomputer) 31, a memory 32 as storage means, an I / O interface 33, a bus I / O interface 34 as transmission / reception means, and the like. The control box 9 has L
A display 37 composed of an ED or the like, a switch 38 as an input means, a switch 39, and the like are provided. The display 37 and the switch 38 are connected to an I / O interface 33 and connected to the operation panel 11. It is arranged.

The bus I / O interface 3
Reference numeral 4 is connected to the signal line 22 via the switch 39, and exchanges data with the temperature sensor 27, the switching elements 28,... Via the signal line 22. Here, a plurality of refrigerators 1 are installed as shown in FIG.
The switch 39 of the control box 9 is connected to an external personal computer P (external control device) as shown in FIG. 3 via a communication line 42 such as a telephone line. Then, in response to an instruction from the controller 36 or the personal computer P, the signal line 22
A signal system connected to the bus I / O interface 34
The connection is switched to the communication line 42, and the connection between the bus I / O interface 34 and the communication line 42 is controlled.

In the controller 36, a predetermined communication protocol for performing data communication with the temperature sensor 27, the switching element 28, the personal computer P and the like, and software for identifying the temperature sensor 27 and the switching element 28 are set. ing. It is assumed that a predetermined communication protocol for performing data communication with the temperature sensor 27, the switching element 28, the controller 36, and the like, and software for identifying the temperature sensor 27 and the switching element 28 are also set in the personal computer P. .

Next, the structure of the temperature sensor 27 is shown in FIGS. The temperature sensor 27 includes a CPU 43 as sensor-side control means and a memory 4 as storage means.
4 and an I / O interface 46 as transmission / reception means
, An A / D converter 47, and a sensor unit 48 as a detection element (temperature detection element) connected to the A / D converter 47
And a capacitor 49 as a power storage element, a diode 51 as a rectifying element, and the like.

In this case, the capacitor 49 is connected to the diode 5
1, and each element is connected to a connection point between the diode 51 and the capacitor 49. Signal line 2
2, a potential (high potential) of, for example, +5 V is applied, and the data is composed of pulses that fall from the high potential to a low potential of 0 V, for example.

Then, when the temperature sensor 27 is connected to the signal line 22, power is supplied to each element as it is while the high-potential and low-potential pulse signals constituting data are at the high potential, and the capacitor 49 is connected. Is also charged. During the low potential period, the capacitor 49 is discharged from the capacitor 49 to supply power to each element.

The temperature sensor 27 has Vcc (DC +
5V) A power supply terminal 45 is also provided, and is connected to a connection point between the diode 51 and the capacitor 49. If the Vcc power supply terminal 45 is connected to a power supply line, each element is supplied with power from the power supply line. It is configured so that it can also operate. That is, in this case, each element operates without filling the capacitor 49, so that the convenience is improved when it is desired to quickly operate the temperature sensor 27 at the time of inspection or the like.

Further, the CPU 43 takes in the temperature data detected by the sensor section 48 via the A / D converter 47 and writes it into the memory 44 once. Then, the controller 36 is connected to the controller 36 via the signal line 22 by the I / O interface 46.
, The temperature data written in the memory 44 is transferred to the signal line 2 by the I / O interface 46.
2 to the controller 36.

Here, the memory 44 has the temperature sensor 27
An ID code of the sensor itself, identification data indicating that the sensor is used, set value data such as an alarm temperature, a protocol for performing data communication with the controller 36, and the like are stored. If a failure occurs in the temperature sensor 27, the failure data is also written to the memory 44,
Sent to controller 36.

The temperature sensor 27 is mounted on a substrate 52 having a width of about 5 mm as shown in FIG. 5, and is housed in a case 53 and then molded with a resin 54. At this time, the surface of the substrate 52 has been subjected to the primer treatment, and the adhesion and the waterproofness to the resin 54 have been improved.
56 is a lead wire drawn out of the substrate 52,
Its surface is also primed. Reference numeral 57 denotes a connector for connecting to the signal line 22.

On the other hand, the structure of the switching element 28 is shown in FIG. The switching element 28 includes a CPU 58 as a switching element side control unit, a memory 59 as a storage unit, an I / O interface 61 as a transmission / reception unit, an I / O interface 62 as a driver, and an I / O interface 62 as a driver. , A transistor 63 as a switching means, a capacitor 64 as a power storage element, a diode 66 as a rectifying element, and the like.

In this case, the capacitor 64 is connected to the diode 6
6, and each element is connected to a connection point between the diode 66 and the capacitor 64. When the switching element 28 is connected to the signal line 22, power is supplied to each element as long as the high-potential and low-potential pulse signals constituting data are at the high potential as described above, and the capacitor 64 is also supplied to the capacitor 64. Charged. While the potential is low, the capacitor 64 discharges power to supply power to each element.

As shown by the broken line in FIG. 7, the switching element 28 is also provided with a Vcc (DC + 5V) power supply terminal 55 connected to the connection point between the diode 66 and the capacitor 64, and this Vcc power supply terminal 55 is connected to the power supply line. If connected, each element of the switching element 28 can operate even by power supply from the power supply line. That is, in this case, each element operates without filling the capacitor 64.
The convenience is improved when the user wants to operate the camera 8 quickly.

When ON / OFF data is transmitted from the controller 36 via the signal line 22 by the I / O interface 61, the CPU 58 turns ON / OFF the ON / OFF data.
The transistor 63 is turned on / off by the I / O interface 62 based on the F data.

Here, the memory 59 stores an ID code of the switching element 28 itself, identification data indicating that the element is a switching element, a protocol for performing data communication with the controller 36, and the like. If a failure has occurred in the switching element 28, the data is also written into the memory 59, and the controller 36
Sent to.

The switching element 28 is connected to each drive board 2
3. The switching unit 68 is wired on the power supply boards 24 and 26 as shown in FIG. That is, 69 is a photocoupler comprising a photodiode 69A and a phototriac 69B, 71 is a resistor, 72 is a diode as a rectifying element, and 73 is a capacitor 74 as a power storage element.

In this case, the capacitor 74 is connected to the diode 7
A resistor 7 is connected between the connection point of the diode 72 and the capacitor 74 and the collector terminal (indicated by S2 in FIG. 7) of the transistor 63 of the switching element 28.
1 and the photodiode 69A are connected in series. The terminal S1 (FIG. 7) of the switching element 28 is connected before the diode 72. The photo triac 69B is interposed between the AC power line 21 and the compressor 13, the fans 7, 15 and the dew prevention heater 8, respectively.

When the diode 72 is connected to the signal line 22, power is supplied to the photodiode 69A via the resistor 71 as long as the high-potential and low-potential pulse signals constituting data are at the high potential. , The capacitor 74 is also charged. While the potential is low, the capacitor 74 is discharged from the capacitor 74 to supply power to the photodiode 69A.

Similarly, the diode 72 and the capacitor 7
Vcc power supply terminal 60 is connected to the connection point
If the power supply terminal 60 is connected to the power supply line, the photodiode 69A can operate even by power supply from the power supply line. That is, in that case, each element operates without filling the capacitor 74.
Convenience is improved when it is desired to operate quickly at the time of inspection or the like.

The operation of the above configuration will be described. In this case, it is assumed that the switch 39 connects the bus I / O interface 34 to the signal line 22. First, refrigerator 1
The operation at the completion of the assembly will be described. Assuming that the temperature sensors 27 and the switching elements 28 are connected to the signal line 22, the CPU 31 of the controller 36 first scans the connection status of each element (the temperature sensor 27 and the switching element 28) to the signal line 22. .

The temperature sensor 27 and the switching element 28
CPUs 43 and 58 have their own I.P.S. stored in the memories 44 and 59 in response to polling from the controller 36.
Reply D code. The CPU 31 of the controller 36 identifies the connection status between the temperature sensor 27 and the switching elements 28.
, And thereafter, data is transmitted to each element using this ID code.

Next, the actual control operation will be described. The CPU 31 of the controller 36 polls the temperature sensor 27 at a predetermined cycle. This poll is based on the ID
It is based on code. CPU of the temperature sensor 27
43 transmits the temperature data to the controller 36 as described above in response to this polling. CP of controller 36
U31 temporarily writes the received temperature data into the memory 32, compares the temperature data with the set temperature, and turns ON / O.
The FF data is transmitted to the signal line 22 together with the ID code of the switching element 28 of the drive board 23.

The C of the switching element 28 of the drive board 23
When receiving the ON / OFF data of its own ID code, the PU 58 receives the ON / OFF data of the
Is turned ON / OFF. ON / O of this transistor 63
The photodiode 69A is turned ON (light emission) by the FF /
The photo triac 69B is turned on / off, thereby turning on / off the compressor 13.

Since the fans 7, 15 and the anti-condensation heater 8 are continuously energized, ON / OFF data to that effect is given by:
It is transmitted based on the ID code of the switching element 28 of each of the power supply boards 24 and 26. Each switching element 28 operates or energizes each of the fans 7, 15 or the dew-proof heater 8 based on the ON / OFF data.

If a failure has occurred in the temperature sensor 27 or the switching elements 28,..., The failure data is transmitted from the CPU of each element to the controller 36.
Upon receiving the failure data, the CPU 31 of the controller 36 displays on the display 37 that the temperature sensor 27 or the switching element 28 has failed. Further, the switch 39 connects the bus I / O interface 34 to the communication line 42 to alert the personal computer P to that effect.

Further, in the situation where each refrigerator 1 controls individually as described above, the CPU of the controller 36
If 31 fails, the switch 39 automatically connects the signal line 22 to the communication line 42. As a result, the exchange of data between the temperature sensors 27 and the switching elements 28,...
Each device is controlled by the control from.

Next, when each refrigerator 1 is to be centrally controlled by the personal computer P, the switch 39 connects the signal line 22 to the communication line 42 according to an instruction from the controller 36 or the personal computer P. Thus, similarly, the exchange of data between each temperature sensor 27 and the switching element 28,..., And control is changed by the personal computer P, and the compressor 13 of each refrigerator 1 is controlled by the personal computer P.
Are controlled centrally.

For example, when starting the compressors 13 of the refrigerators 1..., They are started at different timings. Thereby, control such as reducing the maximum power consumption and leveling the power is performed.

Although the temperature sensor has been described in the embodiment, the present invention is also effective as a humidity sensor or a pressure sensor by using an element for detecting humidity or pressure as the sensor unit.

In the embodiments, the present invention has been described using a commercial refrigerator. However, the present invention is not limited to this, and various electric devices such as a home refrigerator, a low-temperature showcase, a prefabricated refrigerator, an air conditioner, and a vending machine, or The present invention is also effective for home automation and security systems in automobiles and houses.

[0056]

As described in detail above, claims 1, 3,
According to the invention of claim 4, the sensor-side control means of the sensor of the equipment such as each of the cooling storages writes the data detected by the detecting element or the temperature detecting element to the storage means, and the external control via the signal line by the transmitting / receiving means. Since the data is transmitted to the device, the external control device can fetch the temperature data of the device such as each cooling storage without any trouble.

In this case, the sensor stores its own I
Since the D code is held, the external control device can identify the sensor by connecting the sensor to the signal line, and the wiring of the sensor is completed.

According to the second, third and fourth aspects of the present invention, the switching element-side control means of the switching element is based on data from the external control device received by the transmission / reception means via the signal line. Since the switching means is controlled, the external control device can control devices such as the compressor of the cooling storage without any trouble.

Also in this case, since the switching element has its own ID code in the storage means, the external control device can identify the switching element by connecting the switching element to the signal line, and the switching element can be identified. Wiring is completed.

Thus, according to the present invention, it is possible to wire sensors and switching elements by so-called plug-in, and it is possible to significantly simplify wiring. In addition, the common software can be used for the external control device irrespective of the number of devices such as cooling storages, the number of sensors and the number of switching elements, and the like, so that the cost can be significantly reduced by common use.

Since devices such as compressors of a plurality of cooling storages are centrally controlled by an external control device, for example, the compressors of the respective cooling storages are not started simultaneously when they are started, but are started at different timings. Demand control is also possible, which can contribute to power leveling and the like.

According to the fifth aspect of the present invention, in addition to the above, the sensor and / or the switching element performs charging while the signal line is at a high potential and discharges while the signal line is at a low potential. Since it has a storage element that supplies the power of the means,
The sensor or the switching element operates with power from a signal line for transmitting and receiving data. Therefore, the wiring is completed only by connecting the sensor or the switching element to the signal line without connecting the sensor or the switching element to the power supply line, so that the wiring by plug-in can be further simplified. It becomes something.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a commercial refrigerator according to an embodiment of the present invention.

FIG. 2 is an electrical wiring diagram of the refrigerator of FIG. 1;

FIG. 3 is a block diagram of an electric circuit of the control box.

FIG. 4 is a block diagram of an electric circuit of the temperature sensor.

FIG. 5 is a perspective view of a temperature sensor.

FIG. 6 is a plan view showing a state where the temperature sensor is molded.

FIG. 7 is a block diagram of an electric circuit of the switching element.

FIG. 8 is an electric circuit diagram of a switching unit using a switching element.

FIG. 9 is a diagram showing a state in which a plurality of refrigerator control boxes are connected to a personal computer via a communication line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 6 Cooler 7 Cooling fan 8 Dew-proof heater 9 Control box 13 Compressor 14 Condenser 16 Condenser fan 22 Signal line 27 Temperature sensor 28 Switching element 31, 43, 58 CPU 32, 44, 59 Memory 39 Switch 42 Communication Line 46, 61 I / O interface 48 Sensor unit 49, 64 Capacitor 51, 66 Diode 63 Transistor 69 Photocoupler 69A Photodiode 69B Phototriac P Personal computer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E044 AA01 AA20 CC08 CC10 DA10 DB16 DE01 DE02 FB11 3L045 AA02 LA16 NA09 PA02 PA04 PA06 3L061 BA01 BA05

Claims (5)

[Claims] 1. A device comprising a plurality of devices, signal lines respectively wired to these devices, an external control device connected to the signal lines of the devices, and a sensor connected to the signal lines. The sensor includes a detection element, storage means having its own ID code, transmission / reception means for exchanging data with the external control device via the signal line, and capturing data detected by the detection element. And a sensor-side control unit for writing data in the storage unit and transmitting data in the storage unit to the external control unit by the transmission / reception unit. 2. A device provided with a plurality of devices, a signal line respectively wired to these devices, an external control device connected to a signal line of each device, and a device connected to the signal line, A switching element for controlling operation, wherein the switching element is a switching means, a storage means having its own ID code, and a transmission / reception means for exchanging data with the external control device via the signal line,
A centralized control device for equipment, comprising: a switching element-side control unit that controls the switching unit based on data from the transmission / reception unit. 3. A plurality of devices installed, a signal line respectively wired to these devices, an external control device connected to the signal line of each device, a sensor connected to the signal line, A switching element that is connected to the signal line and controls the operation of the device; the sensor includes a detection element, a storage unit having its own ID code, and the external control device via the signal line. Transmitting / receiving means for transmitting / receiving data; and sensor-side control means for receiving data detected by the detection element, writing the data in the storage means, and transmitting the data in the storage means to the external control device by the transmission / reception means. The switching element includes a switching unit, a storage unit having its own ID code, and a transmission / reception unit that exchanges data with the external control device via the signal line. And signal means,
A centralized control device for equipment, comprising: a switching element-side control unit that controls the switching unit based on data from the transmission / reception unit. 4. A plurality of cooling storages each including a cooling device including a compressor, a signal line wired to each of the cooling storages, and an external control connected to the signal line of each of the cooling storages. Device, a sensor for temperature detection connected to the signal line, and a switching element connected to the signal line and controlling the operation of the compressor and the like, wherein the sensor has a temperature detection element and its own ID A storage unit having a code, a transmission / reception unit for transmitting / receiving data to / from the external control device via the signal line, and taking in the temperature data detected by the temperature detection element and writing the data into the storage unit, the transmission / reception unit A sensor-side control unit for transmitting data in the storage unit to the external control device; When a storage unit which holds its own ID code, and receiving means for transmitting and receiving said external control device and the data through the signal line,
A centralized control device for a cooling storage, comprising: a switching element-side control means for controlling the switching means based on data from the transmission / reception means. 5. The sensor and / or the switching element,
2. The storage device according to claim 1, further comprising: a storage element that performs charging while the signal line is at a high potential and discharges while the signal line is at a low potential to supply power to each unit. 2. A centralized control device for equipment such as a cooling storage according to claim 3 or 4.