JPS58200948A - Air conditioner having signal transmission function - Google Patents

Abstract

PURPOSE:To obtain an air-conditioning control function and various data transmission control functions by a simple constitution by providing the control circuit sections of each air conditioner with microprocessors. CONSTITUTION:The control circuit section incorporated into the air conditioner is provided with the microprocessor (CPU)21, a measured signal such as an indoor temperature is inputted from an input port 18, and made contain in a RAM22 by the CPU21 by a program of a ROM20 through an AD converter 19, and a control signal is transmitted over a cold and hot water valve, etc. from an output port 23 by the program of the ROM20. Start-stop state signals, a trouble monitor signal, etc. are inputted from a digital input port 25, and start-stop signals for a fan, etc. are outputted from a digital output port 26. When data is required from a central monitor controller 27, the CPU21 returns said data through a parallel serial converting circuit section 28, an isolation 30 and a modulation and demodulation circuit 31 from the RAM22. Set data from the central monitor controller 27 is contained in the RAM22, and used at the time of the execution of a control program.

Description

[Detailed Description of the Invention] The present invention relates to an air conditioner, which realizes an air conditioning control function and a transmission control function for exchanging various data with a central monitoring control device at low cost with a simple configuration. The purpose is to improve the reliability of the system.

FIG. 1 shows a conventional example of an air conditioner and a signal transmission system. In this conventional example, the system is roughly divided into three parts. That is, they are an air conditioner 1 having a built-in air conditioning controller 1a, a transmission slave device 2 and a transmission master device 3 that constitute a transmission system, and a central monitoring and control device 4. FIG. 2 shows an example of a block diagram of the air conditioning controller 12L and the transmission slave unit 2 in a conventional example. Conventionally, air conditioning controller 1&
Since it is composed of analog circuits and relay circuits, it is difficult to send and receive signals to and from the central monitoring device except through relay contacts and through the interface circuit 6. Therefore, the sensor 6 used in the air conditioning controller is used exclusively for control, and the measurement data required by the central monitoring and control device 4 is obtained by separately installing the measurement sensor 7 and sending it to the transmission slave unit 2.
It was necessary to input the data by passing it through the built-in Mu/D converter 8.

Furthermore, the interface circuit 9 is also required on the side of the transmission slave unit 2, which makes the circuits of both the air conditioner and the transmission slave unit complicated. Since the construction becomes complicated, the system has the disadvantage of not only increasing the price but also decreasing reliability and construction quality.

The present invention eliminates the need for an interface circuit and achieves compactness by sharing peripheral circuits by using the same microprocessor for controlling air conditioners and controlling signal transmission with central monitoring and control equipment, etc. Furthermore, by incorporating the entire control unit into the air conditioner, test run checks, maintenance inspections, and installation work are greatly simplified, and the system including the central monitoring and control unit, air conditioner, and signal transmission system The aim is to achieve significant overall cost reductions and to achieve high reliability.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

FIG. 3 is a block diagram of a control circuit section built into the air conditioner that performs air conditioning control and data transmission control.

Reference numeral 18 denotes a measurement signal input port, into which indoor temperature, indoor humidity, etc. required for air conditioning control are input, and the A/D converter 19
The data is stored in the RAM 22 by the microprocessor (hereinafter referred to as CPU) 21 according to the program incorporated in the ROM 20. Furthermore, according to the control program incorporated in the ROM 20, the cold/hot water valve, humidifier, etc. are controlled through the analog output port 23. 24
is the useless D/MU converter. Further, a digital input port 26 provides an on/off status signal.

A failure monitoring signal and the like are inputted, and a signal for starting/stopping a fan, etc. is outputted from the digital output port 26. The data required by the central monitoring and control device 27 is as follows.
+ Human input from 18 as a measurement signal for mlI, RAM
22, therefore, when there is a data request from the central supervisory control device 27, the CPU 21 can send the corresponding data back to the RAM 22 via the parallel/serial conversion circuit section 28, isolation 3o, and modulation/demodulation circuit 31. Further, when a setting signal is sent from the central supervisory control device 27, the setting data is stored in the RAM 22 and used when executing the control program.

The CPU 21 normally executes an air conditioning control program stored in the ROM 20. When a signal is input from the central supervisory control device 27, the falling edge 32 of the start bit 33 is detected as shown in FIG. 4, and an interrupt signal is input to the CPU 21 to cause the transition to the transmission control program. can. If the data transmission speed is about 1KBPS, the duration of one bit is about 1ooμ East,
The CPU 21 can shift to the transmission control program while the start bit continues. Furthermore, indoor air conditioning control systems generally have extremely large dead times and large time constants, and
The sampling interval of the +U signal and the output J change interval of the control signal may be set in units of seconds or more. Therefore, C.P.
The time it takes to implement the H transmission control program has a negligible effect on air conditioning control. FIG. 6 shows an example of the connection between the control circuit section, the transmission base unit 37, and the central monitoring and control device 38 according to the present invention.

Since the control circuit unit 36 has the air conditioning control function and the transmission control function as described above, the control circuit unit 36 has the air conditioning control function and the transmission control function.
This eliminates the need for wiring between the two. Therefore, the on-site instrumentation work around the air conditioner is only the connection work between the air conditioner and the transmission line 39.

In this way, by focusing on the characteristics of air conditioning control and having the same microprocessor perform air conditioning control and transmission control, we can reduce the interface circuit, sensor, ROM,
It becomes possible to share RAM and peripheral circuits, making it possible to reduce the cost and size of the control circuit section.

As described above, according to the present invention, by causing the control circuit section in the air conditioner to transfer air conditioning-related data necessary for the central monitoring and control device to monitor or control inside the building. As a result of simplifying the instrumentation work and lowering the price of the controller, it is possible to significantly reduce the cost of the entire system, including the air conditioner, transmission system, and medium fire monitoring and control device, and improve the reliability of the system.

[Brief Description of the Drawings] Fig. 1 is a block diagram of a conventional central monitoring and control system for an air conditioner, Fig. 2 is a block diagram of an air conditioning controller and a transmission slave unit of the same system, and Fig. 3 is a block diagram of the system according to the present invention. FIG. 4 is an explanatory diagram showing an example of a signal configuration of a transmission line, and FIG. 6 is a block diagram of an air conditioning system in an embodiment of the present invention. 20...ROM, 21...Micro blower (CPU), 22...RAM, 2
3...Analog output line, 27...Central monitoring and control device, 36...Control circuit section with built-in air conditioner, 37...Den Jη main unit, 38.・・・・・・
Central monitoring and control equipment. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] It has a built-in control circuit section, and the control circuit section includes an input/output section for controlling air-electric harmonics, an input/output section for signal transmission control, and an input/output section for controlling air/electrical conditioning device; An air conditioner with a signal transmission function, which is equipped with a common microprocessor that controls the input/output section.