JP2001082872A - Controller for instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for an instrument having improved control performance and usability while sharply improving productivity and reducing the cost by standardizing parts and simplifying wiring. SOLUTION: The apparatus includes signal wires 22, 24, a controller connected with the signal wires 22, 24, a sensor 27 connected with the signal wires and a DC power supply 23. The sensor 27 includes a detection element, storage means having an own identify code, transmission/reception means for delivering data to the controller through the signal wires, terminal side control means for incorporating data detected by the detector element and transmitting the same to the controller through transmission/reception means, storage means for supplying electric power to each means by changing it with electricity during the signal wire being at high electric potential while discharging electricity during the signal wire being at a low electric potential, and a power supply terminal for supplying power from the DC power supply to each means. Hereby, the controller hereby controls power supply from the DC power supply to the sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, refrigerators and low-temperature showcases of this type have a built-in compressor, condenser, cooler and the like constituting a cooling device, or a compressor and a condenser are separately provided and discharged from the compressor. The condensed refrigerant is condensed in a condenser, depressurized by a decompression device, and then supplied to a cooler to exert a cooling effect.Cool air cooled by this cooler is circulated in the refrigerator by a cooling fan. To a predetermined 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 refrigerators and the like, temperature sensors are mounted according to various uses such as control of the temperature in the refrigerator or protection of the compressor and the 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.

[0005] For this reason, the productivity has been remarkably reduced, especially for business-use equipment produced in small quantities by other models, and improvement has been desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problems, and achieves a remarkable improvement in productivity and a reduction in cost due to common use of parts and simplification of wiring. It is intended to provide a control device for a device which also improves the usability.

[0007]

According to a first aspect of the present invention, there is provided a control apparatus for a device, comprising: a signal line wired to the device; main control means connected to the signal line; and a sensor connected to the signal line. , A power supply device, the sensor is a detection element,
Storage means holding its own identification code, transmitting / receiving means for exchanging data with the main control means via a signal line, and terminal-side control for taking in data detected by the detecting element and transmitting the data to the main control means by the transmitting / receiving means Means for charging while the signal line is at a high potential and discharging while the signal line is at a low potential to cover the power of each means; and for supplying power from the power supply to each means. A power supply terminal, wherein the main control means controls power supply from the power supply device to the power supply terminal of the sensor.

According to a second aspect of the present invention, there is provided a control apparatus for a device, comprising: a signal line wired to the device; main control means connected to the signal line; a switching element connected to the signal line; A switching device, a storage device having its own identification code, a transmission / reception device for transmitting / receiving data to / from the main control device via a signal line, and a switching device based on data from the transmission / reception device. Terminal-side control means for controlling the means, charging while the signal line is at a high potential, and discharging while the signal line is at a low potential to cover the power of each means; A power supply terminal for supplying power to the means, and the main control means controls power supply from the power supply device to the power supply terminal of the switching element.

A control device for a device according to a third aspect of the present invention further comprises a switching element for providing a power supply path from the power supply to the sensor or the switching element, and the main control means controls the operation of the switching element. It is characterized by doing.

According to the present invention, the terminal control means of the sensor transmits the data detected by the detecting element to the main control means via the signal line by the transmission / reception means, so that the main control means takes in the detected data without any trouble. be able to. Further, since the terminal-side control means of the switching element controls the switching means based on the data from the main control means received by the transmission / reception means via the signal line, the main control means can execute the control of the device without any trouble. it can. In this case, since the sensor or the switching element has its own identification code in the storage means, by connecting the sensor or the switching element to the signal line, the main control means can identify the sensor or the switching element. And the wiring of the switching element is completed.

This makes it possible to wire the sensors and the switching elements by so-called plug-in, and to remarkably simplify the wiring. In addition, since common software can be used for the main control means regardless of the number of sensors and switching elements, it is also possible to significantly reduce costs by sharing the main control means.

Further, since the sensor and the switching element are charged while the signal line is at a high potential, and are discharged while the signal line is at a low potential, they are provided with power storage means for supplying power to each means. The sensor and the switching element can operate with power from a signal line for transmitting and receiving data. Therefore, it is possible to reduce power consumption for operating the sensor and the switching element.

Further, the sensor and the switching element are provided with a power supply terminal for supplying power from the power supply to each unit, and the main control means controls the power supply from the power supply to the power supply terminal of the switching element. At the time of inspections and alarms requiring quick response, the main control unit supplies power to the power supply terminals of the sensors and switching elements from the power supply device so that the response speed of the sensors and switching elements can be increased. Become.

Thus, it is possible to supply power to the sensor and the switching element from the power supply device in a situation where quick operation is required while reducing power consumption by operating the apparatus normally by supplying power from the power storage means. Is significantly improved.

Further, if the power supply path from the power supply to the sensor or the switching element can be grounded by the switching element by the main control means, it is possible to prevent a failure due to noise or the like due to power supply / stop of the power supply, It is also possible to perform reset when the failure occurs.

[0016]

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 of a device 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 an in-compartment fan 7 driven by a motor are provided.

Further, a defroster (electric heater) 30 (FIG. 2) for defrosting is attached to the cooler 6, and an anti-condensation heater 8 for preventing dew condensation is provided on the opening edge of the heat insulating box 2.
Is provided, and an operation panel 11 of a control box 9 as a main control means is attached to 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 decompressed by a pressure reducing device (not shown), and then supplied to the cooler 6. 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 in-compartment 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.

When the condenser fan 16 is operated, outside air is passed through the condenser 14 and the compressor 13 so that they are air-cooled. Further, the defroster 30 is energized every predetermined time or at a predetermined time. When the defroster 30 is energized, heat is generated and the cooler 6 is heated to perform defrosting. Furthermore, 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 numerals 22 and 24 denote signal lines for transmitting and receiving data. AC power line 21
Is connected to the compressor 13, the fans 7 and 16, the defroster 30, and the drive board 26 of the dew-proof heater 8, and the signal lines 22 and 24 are connected to the control box 9 and wired in the main body 5. I have.

The signal line 22 has a chip-shaped internal temperature sensor 27 as a sensor for detecting the temperature in the storage room 3.
A chip-shaped defrost sensor 10 as a sensor for detecting the temperature of the cooler 6; a chip-shaped high-temperature sensor 20 as a sensor for detecting the temperature of the condenser 14; and a plurality of chips attached to the drive board 26 Are connected via connectors.

Further, a DC power supply 23 as a power supply device comprising a rectifier circuit is mounted on the drive board 26 and connected to a signal line 24. The DC power supply 23 generates a DC Vcc power supply (for example, DC +5 V) from a commercial AC power supply supplied from the AC power supply line 21, and its output terminal is described later via a DC power supply line 39 (a power supply path shown in FIG. 3). , The defrosting sensor 10, the high-temperature sensor 20, the switch elements 28,..., And the Vcc power supply terminals 45, 55, 60 of the switching unit 68. The DC power supply 23 also has a communication function with an identification code and a controller 36 as described later.

The driving substrate 26 has a switching element 2
8 are provided for the compressor 13, the fans 7 and 16, the defroster 30, and the dew-proof heater 8.
Reference numeral 42 denotes a DC power supply for the control box 9.

Next, the configuration of the control box 9 is shown in FIG. The control box 9 is provided with a controller (substrate) 36. This controller 3
Reference numeral 6 denotes 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. Control box 9
Includes a display 37 composed of a liquid crystal display panel and a switch 38 as input means (keyboard, mouse, etc.).
The indicator 37 and the switch 38 are provided.
Are connected to the I / O interface 33 and arranged on the operation panel 11.

The bus I / O interface 3
4 is connected to signal lines 22 and 24 to exchange data with the temperature sensor 27 and the switching elements 28... Via the signal line 22 and to communicate with the DC power source 23 and the switching element 25 via the signal line 24. Send and receive data.

The controller 36 has a predetermined communication protocol for performing data communication with the internal temperature sensor 27, the defrost sensor 10, the high temperature sensor 20, the switching elements 28 and 25, and the DC power supply 23, and each sensor 2 to be described later.
It is assumed that software for searching and identifying 7, 10, 20, the switching elements 28, 25, and the DC power supply 23 is set.

Next, FIG. 4 shows the structure of the inside temperature sensor 27, the defrost sensor 10, and the high temperature sensor 20. still,
Since the sensors 27, 10, and 20 have the same configuration, the internal temperature sensor 27 will be described below. The internal temperature sensor 27 includes a CPU 43 as a terminal-side control unit, a memory 44 as a storage unit, an I / O interface 46 as a transmission / reception unit, an A / D converter 47, and an A / D converter 47.
Sensor unit 4 as a detection element connected to D converter 47
8, a capacitor 49 as a power storage means, 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. Also, I
The / O interface 46 and the input side of the diode 51 are connected to the signal line 22. A potential (high potential) of, for example, +5 V is applied to the signal line 22, and data is configured by a pulse that falls from this high potential to a low potential of 0 V, for example.

The internal temperature sensor 27 has the Vcc
(DC + 5V) A power supply terminal 45 is provided, and a diode 5
1 and the capacitor 49, and Vc
The c power supply terminal 45 is connected to the DC power supply line 39. Thereby, each element is connected to the DC power supply 23 via the DC power supply line 39.
It is operable by power supply from.

The DC power supply line 39 is connected to the Vcc power supply terminal 45.
If the internal temperature sensor 27 is connected to the signal line 22 even if power is not supplied from the DC power supply 23 via the, the high-potential and low-potential pulse signals constituting data remain at the high potential. Power is supplied to each element, and a capacitor 49 is provided.
Is also charged. Since the capacitor 49 is discharged while the potential is low, as long as there is a pulse signal on the signal line 22, the power of each element is covered. However, since the charging time for the capacitor 49 is required, the operation time is extended as compared with the case where power is supplied from the DC power supply 23.

Further, the CPU 43 takes in the temperature data detected by the sensor unit 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 an internal temperature sensor 2
7 stores identification codes of itself, identification data indicating that the sensor is a sensor, set value data such as a low temperature / high temperature alarm temperature, a protocol for performing data communication with the controller 36, and the like. If a failure occurs in the internal temperature sensor 27, the failure data is also written to the memory 44 and transmitted to the controller 36.

On the other hand, the structure of the switching element 28 is shown in FIG. Note that the configuration of the switching element 25 shown in FIG. The switching element 28 includes a CPU 58 as terminal-side control means, a memory 59 as storage means, and an I / O as transmission / reception means.
An interface 61, an I / O interface 62 as a driver, and the I / O interface 62
Transistor 6 as switching means connected to
3, a capacitor 64 as a power storage means, 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. The input sides of the I / O interface 61 and the diode 66 are connected to the signal line 22. The switching element 28 has V
A cc (DC + 5V) power supply terminal 55 is provided and connected to a connection point between the diode 66 and the capacitor 64.
Vcc power supply terminal 55 is connected to DC power supply line 39. Thus, each element can be operated by power supply from the DC power supply 23 via the DC power supply line 39.

The Vcc power supply terminal 55 is connected to the DC power supply line 39.
, The switching element 28 is connected to the signal line 2
2, 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 64 is also charged. Since the capacitor 64 is discharged while the potential is low, the power of each element is covered as long as the signal line 22 has a pulse signal. However, also in this case, the charging time for the capacitor 64 is required, so that the DC power supply 2
The operation time is longer than in the case where power is supplied from the power supply 3.

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 the ON / OF data.
The transistor 63 is turned on / off by the I / O interface 62 based on the F data. CPU5
8 indicates the current operating state (ON or OF) when ON / OFF data is not transmitted from the controller 36.
F) is self-holding.

Here, the memory 59 stores identification codes of the switching elements 28 and 25 themselves, identification data indicating that they are switching elements, 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 to the memory 59 and transmitted to the controller 36.

Here, each of the switching elements 28 is wired on the drive board 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 74 is a capacitor as power storage means.

In this case, the capacitor 74 is connected to the diode 7
2 is connected between the connection point of the diode 72 and the capacitor 74 and the collector terminal (indicated by S2 in FIG. 5) of the transistor 63 of the switching element 28.
1 and the photodiode 69A are connected in series. The terminal S1 (FIG. 5) of the switching element 28 is connected before the diode 72. The phototriac 69B is interposed between the AC power line 21 and the compressor 13, the fans 7, 15, the defroster 30, and the dew-proof heater 8, respectively.

A Vcc power supply terminal 60 is connected to a connection point between the diode 72 and the capacitor 74, and this Vcc power supply terminal 60 is connected to the DC power supply line 39. As a result, the photodiode 69A operates by power supply from the DC power supply 23 via the DC power supply line 39.

When the diode 72 is connected to the signal line 22, power is supplied to the photodiode 69A via the resistor 71 while 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. Therefore, even if the Vcc power supply terminal 60 is not connected to the DC power supply line 39, the signal line 22
The switching unit 68 operates as long as there is a pulse signal in the DC power supply 23.
The operation time is extended as compared with the case where power is supplied from the power supply.

On the other hand, the I / O of the switching element 25
The interface 61 is connected to the signal line 24, the collector terminal of the transistor 63 (indicated by S2 in FIG. 5) is connected to the DC power supply line 39, and the emitter of the transistor 63 is grounded (GND).

The operation of the above configuration will be described. First, the operation at the time of production of the refrigerator 1 will be described. Each sensor 2
7, 10, 20 and the switching element 28.
2 and the DC power supply 23 and the switching element 25 are connected to the signal line 24, the controller 3
6 (CPU 31) first sends each element (sensors 27, 10, 20, switching element 28,...) To signal lines 22 and 24.
, 25, and the connection status of the DC power supply 23).

In this case, the controller 36 comprises all the sensors 27, 10, 20, the switching elements 28,.
5. An ID request is made to the DC power supply 23, and all the sensors 27, 10, 20, and the switching element 28
The DC power supply 23 returns its own identification code and the like to the controller 36.

The controller 36 is connected to the internal temperature sensor 27, the defrost sensor 10 and the high temperature sensor 20 on the signal line 22 based on the returned identification code and the like, and the switching element 28 for the compressor 13 and the defroster 30 , The switching element 28 for the internal fan 7, and the switching element 28 for the anti-condensation heater 8 (actually, there is also a condenser fan). Also,
It recognizes that the DC power supply 23 and the switching element 25 are connected to the signal line 24.

The controller 36 recognizes the temperature sensors 27, 10, 20 and the switching elements 28,.
The connection status of the DC power supply 23 is held in the memory 32, and thereafter, data is transmitted to each element using the identification code.

Next, the actual control operation after the installation of the refrigerator 1 will be described. The CPU 31 of the controller 36 polls the sensors 27, 10, and 20 at a predetermined cycle as described above. This polling is performed based on the aforementioned identification code. CPU 43 of sensors 27, 10, and 20
Transmits the temperature data to the controller 36 in response to the polling as described above. CPU 3 of controller 36
1 temporarily writes the received temperature data into a memory 32, compares the temperature data from the internal temperature sensor 27 with a preset set temperature, and outputs ON / OFF data to the switching element 28 of the compressor 13. To the signal line 22 together with the identification code.

When the CPU 58 of the switching element 28 receives ON / OFF data of its own identification code, it turns ON / OFF the transistor 63 as described above based on the data.
I do. By turning ON / OFF the transistor 63, the photodiode 69A turns ON (light emission) / OFF (turns off).
And the photo triac 69B is turned ON /
The compressor 13 is started /
Stopped.

The CPU 31 of the controller 36
The ON / OFF data is transmitted to the signal line 22 together with the identification code of the switching element 28 of the defroster 30, and the defroster 30 is energized at a predetermined cycle or at a predetermined time to defrost the cooler 6. Then, based on the temperature data from the defrost sensor 10 received as described above, defrost control of the cooler 6 (end at a predetermined temperature) is executed.

Since the fans 7, 16 and the anti-condensation heater 8 are continuously energized, the ON / OFF data to that effect is
It is transmitted based on the identification code of each switching element 28. Then, each switching element 28 is connected to the ON / O
The fans 7 and 16 or the dew-proof heater 8 are operated or energized based on the FF data.

The controller 36 transmits ON / OFF data to the DC power supply 23 via the signal line 24, and always stops the operation of the DC power supply 23. Further, the controller 36 is connected to the switching element 25 via the signal line 24.
ON / OFF data to the switching element 25
Transistor 63 is turned off. The communication at this time is also performed by the identification code of each element.

Thus, each sensor 27, 10,
20 and DC power supply terminals 45, 5
No power is supplied to 5, 60, and accordingly, each element is supplied with power from the capacitors 46, 64, 74 and operates.

Here, when performing the inspection process at the time of production or maintenance after installation, or when the failure data as described above is transmitted from each of the sensors 27, 10, 20 and the switching element 28, the controller 36 The ON / OFF data is transmitted to the DC power supply 23 via the signal line 24 to operate the DC power supply 23. Further, the controller 36 transmits ON / OFF data to the switching element 25 via the signal line 24, and
Is turned off. The communication at this time is also performed by the identification code of each element.

Thus, the DC power supply terminals 45, 55, 6 are connected to the sensors 27, 10, 20 and the switching element 28.
Since power is supplied from 0 and each element operates, the operating speed of each element increases as described above. Therefore, it is possible to quickly inspect the sensor and the switching element.

When the inspection and maintenance are completed, the controller 36 stops the operation of the DC power supply 23 again, turns on the transistor 63 of the switching element 25, and turns it off again. With this configuration, even if noise is going to enter each element when the power supply to the sensors 27, 10, 20, and the switching element 28 is turned on / off, the DC power supply line 39 is grounded by the switching element 25. Intrusion of noise is prevented, and the power supply path from the DC power supply 23 to each sensor and switching element is reset.

Although the embodiment has been described with reference to a sensor for detecting temperature, 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 section.

Further, in the embodiments, the present invention has been described with a commercial refrigerator. However, the present invention is not limited to this, and various types of electric equipment such as a home refrigerator, a low-temperature showcase, a prefabricated refrigerator, and a vending machine, or an automobile, a house, etc. The present invention is also effective for home automation and security systems.

[0059]

As described above in detail, according to the present invention, the terminal control means of the sensor transmits the data detected by the detecting element to the main control means via the signal line by the transmission / reception means. Can capture the detection data without any trouble. Further, the terminal side control means of the switching element,
Since the switching unit is controlled based on data from the main control unit received by the transmission / reception unit via the signal line,
The main control means can execute control of the device without any trouble. In this case, since the sensor or the switching element has its own identification code in the storage means, by connecting the sensor or the switching element to the signal line, the main control means can identify the sensor or the switching element. And the wiring of the switching element is completed.

As a result, it is possible to wire sensors and switching elements by so-called plug-in, and it is possible to significantly simplify wiring. In addition, since common software can be used for the main control means regardless of the number of sensors and switching elements, it is also possible to significantly reduce costs by sharing the main control means.

Further, since the sensors and the switching elements are charged while the signal line is at a high potential and are discharged while the signal line is at a low potential, they are provided with power storage means for supplying power to each means. The sensor and the switching element can operate with power from a signal line for transmitting and receiving data. Therefore, it is possible to reduce power consumption for operating the sensor and the switching element.

Further, the sensor and the switching element are provided with a power supply terminal for supplying power from the power supply device to each means, and the main control means controls the power supply from the power supply device to the power supply terminal of the switching element. At the time of inspections and alarms requiring quick response, the main control unit supplies power to the power supply terminals of the sensors and switching elements from the power supply device so that the response speed of the sensors and switching elements can be increased. Become.

In this way, it is possible to normally operate by power supply from the power storage means and reduce the power consumption, and to supply power to the sensor and the switching element from the power supply device in a situation requiring quickness, thereby improving controllability and usability. Is significantly improved.

Further, if the power supply path from the power supply to the sensor or the switching element can be grounded by the switching element by the main control means, it is possible to prevent the occurrence of a failure due to noise or the like due to the power supply / stop of the power supply. It is also possible to perform reset when the failure occurs.

[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 around a control box.

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

FIG. 5 is a block diagram of an electric circuit of the switching element.

FIG. 6 is an electric circuit diagram of a switching unit using a switching element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 6 Cooler 7 In-compartment fan 8 Dew-proof heater 9 Control box 10 Defrost sensor 13 Compressor 14 Condenser 16 Condenser fan 20 High-temperature sensor 22, 24 Signal line 23 DC power supply 25, 28 Switching element 27 In-compartment temperature sensor 30 Defroster 31, 43, 58 CPU 32, 44, 59 Memory 37 Display 39 DC power supply line 45, 55, 60 Vcc power supply terminal 46, 61 I / O interface 48 Sensor unit 49, 64 Capacitor 51, 66 Diode 63 Transistor 69 Photo Coupler 69A Photodiode 69B Phototriac

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shigeichi Kawai 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Takeshi Aoki 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. F term (reference) 3E044 AA01 CC08 DB16 DB20 DC06 DE01 3L045 AA02 BA01 CA02 DA02 EA01 LA14 MA00 MA02 NA03 NA05 NA19 NA22 NA24 PA02 PA04 PA06 3L061 BA01 BA03

Claims (3)

[Claims] 1. A signal line wired to a device, a main control unit connected to the signal line, a sensor connected to the signal line, and a power supply device, wherein the sensor includes a detection element, Storage means holding its own identification code, transmitting and receiving means for transmitting and receiving data to and from the main control means via the signal line, fetching data detected by the detection element, and transmitting and receiving the data to the main control means by the transmitting and receiving means Terminal-side control means for transmitting; charging while the signal line is at a high potential; discharging while the signal line is at a low potential; and power storage means for supplying power to each means; A power supply terminal for supplying power to the means, wherein the main control means controls power supply from the power supply device to a power supply terminal of the sensor. 2. A signal line wired to a device, a main control unit connected to the signal line, a switching element connected to the signal line, and a power supply device, wherein the switching element is a switching unit. Storage means holding its own identification code; transmitting / receiving means for transmitting / receiving data to / from the main control means via the signal line; and terminal-side control means for controlling the switching means based on data from the transmitting / receiving means. To charge while the signal line is at a high potential, and discharge while the signal line is at a low potential to supply power to each unit, and to supply power to each unit from the power supply device. The main control means controls power supply from the power supply device to a power supply terminal of the switching element. 3. The switching device according to claim 1, further comprising a switching element for providing a power supply path from the power supply device to the sensor or the switching element, wherein the main control means controls the operation of the switching element. Equipment control device.