JP2000241007A - Controller of apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for an apparatus which can achieve communication of control. SOLUTION: A switch 39 can connect a personal computer P, and switches the connection of the line between a controller 36 and a signal line 22 and of the line between the controller 36 and the personal computer P. The controller 36 can fetch the program data sent from the personal computer P through the switch 39.

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 devices such as a commercial / home refrigerator, a low-temperature showcase, a prefabricated refrigerator, a dishwasher, a frozen dessert production device, a vending machine, and an air conditioner. is there.

[0002]

2. Description of the Related Art Conventionally, for example, in a commercial refrigerator, a low-temperature showcase, or a prefabricated refrigerator,
A compressor, a condenser, a cooler, etc. constituting the cooling device are built in, or the compressor and the condenser are separately installed as a refrigerator, and the refrigerant discharged from the compressor is condensed by the condenser, and the pressure is reduced by the decompression device. After reducing the pressure, it is supplied to a cooler to exhibit a cooling effect, and the cool air cooled by this cooler is circulated in the refrigerator by a cooling fan,
It is maintained at 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 a refrigerator, temperature sensors are mounted according to various uses such as controlling the temperature in the refrigerator or protecting 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 vary depending on the model. Therefore, the configuration of electric wiring including switches for controlling them and the configuration of a control device for controlling these, specifically, CPs
The control program of U (microcomputer) also differs for each model. For this reason, the productivity has been remarkably reduced, particularly for business-use equipment in which a large number of models are produced in small quantities, and improvement has been desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and provides a device control apparatus which can achieve common control use.

[0006]

According to a first aspect of the present invention, there is provided a control device comprising: a signal line wired to a device; main control means provided in the device; a sensor connected to the signal line; Switching means interposed between the main control means and the signal line, or a main control means and an external control device. Switching between connecting the line to the control device, the sensor,
A detection element, and storage means having its own ID code;
Transmitting and receiving means for transmitting and receiving data to and from the main control means via a signal line and a switching means; fetching data detected by the detecting element and writing the data in the storage means; and transmitting and receiving data in the storage means to the main control means by the transmitting and receiving means And a sensor-side control means, wherein the main control means takes in program data transmitted from the external control device via the switching means.

According to a second aspect of the present invention, there is provided a control device comprising: a signal line wired to a device; main control means provided in the device; a switching element connected to the signal line for controlling operation of the device; Means and switching means interposed between the signal lines, the switching means can be connected to an external control device,
Switching between connecting the line between the main control means and the signal line or connecting the line between the main control means and the external control device. The switching element has the switching means and its own ID code. Storage means, transmission / reception means for transmitting / receiving data to / from the main control means via signal lines and switching means, and switching element side control means for controlling the switching means based on data from the transmission / reception means. The control means captures program data transmitted from the external control device via the switching means.

According to the first aspect of the present invention, the sensor-side control means of the sensor writes the data detected by the detection element into the storage means, and the switching means connects the line between the main control means and the signal line. In this state, the data is transmitted to the main control unit by the transmission / reception unit via the signal line and the switching unit, so that the main control unit of the device can take in the data without any trouble. In this case, since the sensor has its own ID code in the storage means, the main control means can identify the sensor by connecting the sensor to the signal line, and the wiring of the sensor is completed.

According to the second aspect of the present invention, the switching element side control means of the switching element is configured such that the switching means connects a line between the main control means and the signal line.
Since the switching unit is controlled based on data from the main control unit received by the transmission / reception unit via the signal line and the switching unit, the main control unit of the device can control the device without any trouble. Also in this case, since the switching element has its own ID code in the storage means, the main control means can identify the switching element by connecting the switching element to the signal line, and the wiring of the switching element is completed. I do.

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 greatly simplify wiring. Further, common software can be used for the main control means regardless of the number of sensors and switching elements.

Further, the main control means fetches the program data transmitted from the external control device through the switching means, so that the external control device is connected to the switching means, and the switching means connects the main control means with the external control device. The program data can be written to the main control means from the external control device while the line between them is connected.

[0012] Thereby, the rewriting of the program of the main control means when a bug is found or when a version is upgraded can be executed using the port through which the main control means communicates with the sensor or the switching element. This eliminates the need for a dedicated port for rewriting the program, and simplifies the rewriting operation.

In addition, this makes it possible to use only the main control means shared by a plurality of models and rewrite and use only the program, thereby making it possible to significantly reduce the cost due to the common use of parts. It becomes.

According to a third aspect of the present invention, in the control device, the switching means gives priority to the line between the external control device and the main control means over the line between the main control means and the signal line, and sets the sensor. Alternatively, the switching element has a self-holding function.

According to the third aspect of the present invention, in addition to the above, the switching means gives priority to the line between the external control device and the main control means over the line between the main control means and the signal line.
By connecting the external control device to the switching means, it becomes possible to write the program data to the main control means smoothly. In addition, since the sensors and the switching elements maintain the current state by the self-holding function during that time, no problem occurs even when the program data of the main control means is rewritten during the operation of the device.

[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 refrigerating cycle of the cooling device and a cooling fan 7 driven by a motor are provided. A dew-proof heater 8 for preventing dew condensation is provided at the opening edge of the heat-insulating box 2, and a door 4 is provided.
An operation panel 11 of a control box 9 constituting a main control means is mounted on a front surface of the control box 9.

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 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. The condenser fan 1
6 is operated, the outside air is supplied to the condenser 14, the compressor 1
These are air cooled as they ventilate 3. Further, when the dew-proof heater 8 is energized, the opening edge of the heat insulating box 2 is heated,
Dew condensation is prevented.

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 wired in the main body 5 for transmitting and receiving data. The control box 9 is connected to the AC power line 21 and the signal line 22.
Is connected, and the driving substrate 2 of the compressor 13 is
3. The power supply board 24 of each of the fans 7 and 16 and the power supply board 26 of the dew-proof heater 8 are connected to an AC power supply line 21.
In this case, a switch 39 described later as switching means is interposed between the control box 9 and the signal line 22.

The signal line 22 has a chip-shaped temperature sensor 27 as a sensor for detecting the temperature of the storage room 3 and a chip-shaped switching element 28 attached to the drive board 23 and the power supply boards 24 and 26, respectively. Are connected via connectors. Although one switching element 28 is shown on the power supply board 24, it is actually provided for each of the fans 7 and 16.

In the embodiment, the drive board 23 and the power supply boards 24 and 26 correspond to the compressor 13 and the fans 7 and 16 respectively.
And the drive board 23 and the power supply boards 24 and 26, together with the respective switching elements 28, are combined 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 compressor 13, the fans 7 and 16, or each of the switching elements 28 built in the dew-proof heater 8 and the connector of the signal line 22. Assembly and wiring workability is further improved.

Next, the structure of the control box 9 is shown in FIG. The control box 9 is provided with a controller (substrate) 36 as main control means.
The controller 36 includes a CPU (microcomputer) 31, a memory 32 including a flash memory or the like, a storage unit 32, an I / O interface 33, and a bus I / O interface 34 as a transmission / reception unit.
It is composed of The control box 9 is provided with a display 37 composed of an LED or the like and a switch 38 as input means. The display 37 and the switch 38 are connected to the I / O interface 33.
Connected to the operation panel 11.

The bus I / O interface 3
4 is connected to the switch 39 via a port 36A of the controller 36, and the switch 39 is connected to the signal line 22, and the port 36A, the switch 39 and the signal line 22 are connected.
Via the temperature sensor 27 and the switching element 28.
・ ・ Send and receive data. This switch 39 can be connected to a laptop PC P (external control device) via a communication line 42.

FIG. 7 is a block diagram showing the internal configuration of the switch 39. The switch 39 is composed of three ICs IC1, IC2 and IC3, each of which is connected by a data line. The personal computer P can be connected to IC1, and the port 3 of the controller 36 is connected to IC2.
6A is a form in which the signal lines 22 are connected to the ICs 3, respectively.

When the personal computer P is not connected, the line between the controller 36 (the bus I / O interface 34) and the signal line 22 is connected.
When the personal computer P is connected and data (connection instruction) is sent from the personal computer P, the controller 36 and the signal line 22 are connected.
The line between the personal computer P and the controller 36 is preferentially connected. Then, when the personal computer P is removed (or when the communication between the personal computer P and the controller 36 ends), the controller 36 and the signal line 22 are again connected.
It connects the lines between them.

The memory 32 of the controller 36 has 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. A control program for performing wear and operation control is set.

The personal computer P also has the temperature sensor 27
It is assumed that a communication protocol, which will be described later, for performing data communication with the switching element 28, the controller 36, and the like, and software for identifying the temperature sensor 27 and the switching element 28 are set.

Next, the structure of the temperature sensor 27 will be described with reference to FIG.
Shown in The temperature sensor 27 is connected to the CPU 43 as sensor-side control means, the memory 44 as storage means, an I / O interface 46 as transmission / reception means, an A / D converter 47, and this 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.

When the temperature sensor 27 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, 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 + 5
V) A power supply terminal 45 is also provided, which is connected to a connection point between the diode 51 and the capacitor 49,
Is configured such that if the Vcc power supply terminal 45 is connected to a power supply line, each element can operate also by power supply from the power supply line. 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 temporarily writes it in the memory 44. Then, the signal line 22 and the switch 39 (switch 3
9 is connected via the line between the controller 36 and the signal line 22), the temperature data written in the memory 44 is transferred to the I / O.
The signal line 22 and the switch 3 by the O interface 46
9 to the controller 36.

The memory 44 stores an ID code of the temperature sensor 27 itself, identification data indicating that the sensor is a sensor, set value data such as an alarm temperature, a communication protocol for performing data communication with the controller 36, and the like. It is remembered. If a failure has occurred in the temperature sensor 27, the failure data is also written to the memory 44 and transmitted to the controller 36.

The temperature sensor 27 is connected to a controller 36.
It is assumed that the communication device has a self-holding function for holding the current state when communication with the device is interrupted.

FIG. 5 shows the structure of the switching element 28. 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.

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, as shown by the broken line in FIG. 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.

The CPU 58 uses the I / O interface 61 to control the signal line 22 and the switch 39 (switch 39).
Is connected to the line between the controller 36 and the signal line 22).
When data is transmitted, the I / O interface 62 controls the transistor 6 based on the ON / OFF data.
3 is turned ON / OFF.

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 communication protocol for performing data communication with the controller 36, and the like. Also,
When a failure occurs in the switching element 28, the data is also written to the memory 59 and transmitted to the controller 36.

It is also assumed that the switching element 28 has a self-holding function for holding the current state when the communication with the controller 36 is interrupted.

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
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 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. Now, the switch 39 connects the line between the bus I / O interface 34 of the controller 36 and the signal line 22. Assuming that the refrigerator 1 is assembled and each of the temperature sensors 27 and the switching elements 28 are connected to the signal line 22, the CPU 31 of the controller 36 first transmits each element (the temperature sensor 27 and the switching element 28) to the signal line 22. Scan the connection status of.

This scanning operation is performed by reading the ID code of the temperature sensor 27 and each switching element 28 in the procedure shown in FIG. First, it is assumed that the ID codes of the temperature sensor 27 and the three switching elements 28 are 64 bits as shown below.

Bit 012345678... 63 Temperature sensor 27 001100000... 0 Switching element 28 10110000000... 0 Switching element 28 110000000... 0 Switching element 28 00100000. ..... 0

The controller 36 (CPU 31) first transmits a communication command to each of the temperature sensors 27 and the switching elements 2.
, And each temperature sensor 27 and switching element 28... Return an OK command. Next, when the controller 36 transmits the ID search command, the temperature sensor 2
7, and the CPUs 43 and 58 of the switching elements 28... Return the 0th bit as the response 1 from their own ID codes stored in the memories 44 and 59, and return the complement as the response 2 as follows. Actually, when the 0th bit is 0, the connection terminal of the signal line 22 is set to “L” and 1
In this case, the terminal is set to “H”.

Bit 0 Response 1 Response 2 Temperature sensor 27 0 1 Switching element 28 10 Switching element 28 10 Switching element 28 0 1 Logical product 0 0

The controller 36 makes a judgment based on the logical product, and determines each of the temperature sensors 27 and the switching elements 28.
It is determined that 0 and 1 are present in the 0th bit of. still,
Actually, the signal line 22 becomes "L" if there is at least one "L" in the connection terminals of the temperature sensors 27, the switching elements 28,... Connected to the signal line 22, and "H" if all are "H". H ". Since the controller 36 determines the potential of the signal line 22, the controller 36 detects the information of the logical product as a result.

Then, the controller 36 transmits the search commands 0 and 1 of the first bit. At this time, when 0 is transmitted, only the temperature sensor 27 or the switching element 28 whose 0th bit is 0 returns the first bit, and when 1 is transmitted, only the 0th bit is 1 and only 1 bit is returned. It is configured to reply eyes.

Therefore, the response to 0 at the time of the search of the first bit is made from the temperature sensor 27 and the third switching element 28 as follows.

Bit 1 Response 1 Response 2 Temperature sensor 27 0 1 Switching element 28 Switching element 28 Switching element 28 0 1 Logical product 0 1

The controller 36 makes a determination based on the logical product, and determines that only 0 exists in the first bit in this case. Therefore, it is determined that there is an ID code of 00.

The response to 1 at the time of searching the first bit is as follows:
From the second switching element 28.

Bit 1 Response 1 Response 2 Temperature sensor 27 Switching element 28 0 1 Switching element 28 10 Switching element 28 Logical product 0 0

The controller 36 makes a determination based on the logical product, and determines that 0 and 1 exist in the first bit in this case. Therefore, in this case, it can be seen that the ID codes of 10 and 11 exist.

Next, in response to the existence of the ID code 00, the controller 36 transmits a search command 0 of the second bit. The response to 0 at the time of the search of the second bit is made from the temperature sensor 27 and the first and third switching elements 28 as described below.

Bit 2 Response 1 Response 2 Temperature sensor 27 10 Switching element 28 10 Switching element 28 Switching element 28 10 Logical product 10

The controller 36 makes a determination based on the logical product, and determines that only 1 exists in the second bit in this case. Therefore, it is determined that there is an ID code of 001.

Next, in response to the determination of the existence of the ID code 001, the controller 36 transmits a search command 1 of the third bit. The response to 1 at the time of the search of the third bit is made from the temperature sensor 27 and the first switching element 28.

Bit 3 Response 1 Response 2 Temperature sensor 27 10 Switching element 28 10 Switching element 28 Switching element 28 Logical product 10

The controller 36 makes a determination based on the logical product, and determines that only 1 exists in the third bit in this case. Therefore, it is determined that there is an ID code of 0011.

Next, in response to the existence of the ID code 0011, the controller 36 transmits a search command 1 of the fourth bit. The response to 1 at the time of the search of the fourth bit is made from the temperature sensor 27 and the first switching element 28.

Bit 4 Response 1 Response 2 Temperature sensor 27 0 1 Switching element 28 0 1 Switching element 28 Switching element 28 Logical product 0 1

The controller 36 makes a determination based on the logical product, and determines that only 0 exists in the fourth bit in this case. Therefore, it is determined that there is an ID code of 00110.

Next, in response to the determination of the existence of the ID code 00110, the controller 36 sets the fifth bit of the search command 0
Send The response to 0 at the time of the search of the fifth bit is made from all.

Bit 5 Response 1 Response 2 Temperature sensor 27 0 1 Switching element 28 0 1 Switching element 28 0 1 Switching element 28 0 1 Logical product 0 1

The controller 36 makes a determination based on the logical product, and determines that only 0 exists in the fifth bit in this case. Therefore, it is determined that there is an ID code of 00100. Thereafter, if only the search command 0 is repeated up to the 63rd bit, 001100... 0, that is, it is determined that the temperature sensor 27 of this ID code is connected.

Also, 1 at the time of the search of the first bit
Since 1 and 0 are present in the first bit in the response to, this time, 0 and 1 are transmitted in the search of the second bit, and narrowing down is similarly performed. Finally, if the bits in which 0s and 1s exist are eliminated, all the switching elements 28.
And the ID code of the temperature sensor 27 is determined.

The CPU 31 of the controller 36 identifies the connection status between the temperature sensor 27 and the switching elements 28.
2, and thereafter, data is transmitted to each element using this ID code.

Next, the CPU 31 of the controller 36 polls the temperature sensor 27. The procedure (communication protocol) at this time will be described with reference to FIG. The controller 36 transmits a communication command, and an OK command is returned from the temperature sensor 27. The controller 36 transmits a calling command for the temperature sensor 27 and the ID code (001100 ...) of the temperature sensor 27.

Then, a temperature measurement start command is transmitted. In response to this polling, the CPU 43 of the temperature sensor 27 measures the temperature data as described above and stores it in the memory 44. Next, the controller 36 transmits a communication start command again, and an OK command is returned from the temperature sensor 27. The controller 36 issues a call command for the temperature sensor 27 and the ID code (001100) of the temperature sensor 27.
...).

Then, a memory call command is transmitted. In response to this polling, the CPU 43 of the temperature sensor 27 returns the temperature data stored in the memory 44 as described above. Finally, the controller 36 transmits a reset command, and the temperature sensor 27 returns an OK command.

The CPU 31 of the controller 36 once writes the collected temperature data in the memory 32, compares the temperature data with the set temperature, and turns the temperature data ON / OF.
The F data is transmitted to the switching element 28 of the drive board 23 along with the ID code on the signal line 22 in the same procedure as described above.

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, the ON / OFF data to that effect is
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.

When 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. When 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 a failure.

Next, the operation of writing program data to the controller 36 during production will be described. In this case, the personal computer P is connected to the switch 39 via the communication line 42. When the personal computer P is connected and data (connection instruction) is sent from the personal computer P, the switch 39 disconnects the line between the controller 36 and the signal line 22 as described above, and gives priority to the line between the personal computer P and the controller 36. Connecting.

In this state, the personal computer P transmits program data to the controller 36. Controller 36
CPU 31 has switch 39, port 36A, bus I / O
When the program data is received via the interface 34, it is written into the memory 32.

When a bug is found in the program or the version is upgraded, the personal computer P is connected to the switch 39 in the same manner. In this case, C
The PU 31 rewrites all programs already written in the memory 32 to the transmitted programs.

Further, at this time, even if the switch 39 disconnects the line between the signal line 22 and the controller 36, the temperature sensor 2
7 and the switching elements 28,... Have the self-holding function as described above, so that the operating state is maintained even if the program is written by the personal computer P during operation.

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 home refrigerators, low-temperature showcases, prefabricated refrigerators, dishwashers, vending machines,
The present invention is also effective for various electric devices such as air conditioners, or home automation / security systems in automobiles and houses.

[0088]

As described in detail above, according to the first aspect of the present invention, the sensor-side control means of the sensor writes the data detected by the detecting element into the storage means, and the switching means switches between the main control means and the signal line. In this state, the data is transmitted to the main control means via the signal line and the switching means by the transmission / reception means, so that the main control means of the device can take in the data without any trouble. In this case, since the sensor has its own ID code in the storage means, the main control means can identify the sensor by connecting the sensor to the signal line, and the wiring of the sensor is completed.

Further, according to the second aspect of the present invention, the switching element side control means of the switching element operates in a state where the switching means connects the line between the main control means and the signal line.
Since the switching unit is controlled based on data from the main control unit received by the transmission / reception unit via the signal line and the switching unit, the main control unit of the device can control the device without any trouble. Also in this case, since the switching element has its own ID code in the storage means, the main control means can identify the switching element by connecting the switching element to the signal line, and the wiring of the switching element is completed. I do.

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. Further, common software can be used for the main control means regardless of the number of sensors and switching elements.

Further, the main control means takes in the program data transmitted from the external control device through the switching means, so that the switching means is connected to the external control device, and the switching means connects the main control means with the external control device. The program data can be written to the main control means from the external control device while the line between them is connected.

Thus, when a bug is found or when a version is upgraded, rewriting of the program of the main control means can be executed by using a port through which the main control means communicates with a sensor or a switching element. This eliminates the need for a dedicated port for rewriting the program, and simplifies the rewriting operation.

Further, this makes it possible to utilize the main control means shared by a plurality of models and to rewrite and use only the program, thereby making it possible to achieve a significant reduction in cost due to the common use of parts. It becomes.

According to the third aspect of the present invention, in addition to the above, the switching means gives priority to the line between the external control device and the main control means over the line between the main control means and the signal line.
By connecting the external control device to the switching means, it becomes possible to write the program data to the main control means smoothly. In addition, since the sensors and the switching elements maintain the current state by the self-holding function during that time, no support occurs even when the program data of the main control means is rewritten during the operation of the device.

[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 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.

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

FIG. 8 is a diagram showing a procedure for reading an ID code of each temperature sensor or switching element by a controller.

FIG. 9 is a diagram showing a procedure for collecting temperature data from a temperature sensor by a controller.

[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 Continuing on the front page (72) Katsumi Maekawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kazuya Imamura 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Tsutomu Ishikura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3L045 AA02 AA05 BA01 CA02 DA02 EA01 GA07 HA01 LA05 LA09 LA15 LA18 MA02 NA19 NA25 PA02 PA06 3L061 BA04 5H004 GA33 GA34 GA35 GA40 GB09 GB20 HA01 HB01 JB08 JB19 MA04 MA31 MA37 MA38 MA39 MA47 MA51 MA52 MA56 MA58 MA60 5H215 AA01 AA11 BB01 BB05 BB10 CC03 C0405 GG03 GG03 GG03 GG03 GG03 GG03 GG03 9

Claims (3)

[Claims] 1. A signal line wired to a device, a main control unit provided in the device, a sensor connected to the signal line, and a switching unit provided between the main control unit and the signal line. The switching means is connectable to an external control device, and connects a line between the main control means and the signal line, or a line between the main control means and the external control device. The sensor is a detection element, a storage unit having its own ID code, a transmission and reception unit that exchanges data with the main control unit via the signal line and the switching unit, A sensor-side control unit that fetches the data detected by the detection element, writes the data in the storage unit, and transmits the data in the storage unit to the main control unit by the transmission / reception unit. Control equipment A program data transmitted from the device via the switching means. 2. A signal line wired to a device, main control means provided in the device, a switching element connected to the signal line for controlling operation of the device, and a signal line between the main control means and the signal line. Switching means interposed between the main control means and the signal line, or connecting the line between the main control means and the signal line. The switching element switches whether or not to connect a line to the control device. Transmitting and receiving means for transmitting and receiving, and switching element side control means for controlling the switching means based on data from the transmitting and receiving means, wherein the main control means transmits from the external control device. A control device for a device, wherein the program data to be processed is taken in through the switching means. 3. The switching means gives priority to the line between the external control device and the main control means over the line between the main control means and the signal line, and the sensor or the switching element has a self-holding function. 2. The method according to claim 1, wherein
Or the control apparatus of the apparatus of Claim 2.