JPH06101900A - Air-conditioning controlling system - Google Patents

Abstract

PURPOSE:To provide an air-conditioning controlling system respondable to a change easily, even if there is a little change in a specification of an air- conditioning equipment, while effecting a data input into a programmable controller without complication. CONSTITUTION:In an air-conditioning controlling system having a programmable controller PLC executing a sequence control of an air-conditioning device 1, to the programmable controller PLC, an operation controlling unit 5 is connected. And to this operation controlling unit 5, data for executing an operation treatment which is necessary for controlling an air-conditioning device are transmitted from the programmable controller PLC, and along with this, a feedback of data treated by an operation treatment in the operation control unit 5 based on these data is executed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to improvements in air conditioning control systems.

[0002]

2. Description of the Related Art An air-conditioning control system is provided with a controller connected to an air-conditioning device equipped with a heat exchanger, a fan for blowing air, etc., and this controller controls the indoor environment based on the measured values of various conditions such as temperature sensors. It is generally configured to control the opening / closing of the cold / hot water valve of the heat exchanger so as to set the desired temperature. Thus, as a conventional method for controlling an air conditioner, a method in which a general-purpose programmable controller is used as the controller and a control sequence of the air conditioner is input and operated is applied. In addition, conventionally, as another method different from the above,
This unit uses a CPU unit as a controller
A method of controlling an air conditioner by incorporating a program for controlling an air conditioner into the U unit has also been applied.

[0003]

However, in the former method of using the general-purpose programmable controller, the programmable controller itself is mainly set to replace the relay sequence, so that it is not possible to control the air conditioning equipment. It is not easy to calculate analog data to be handled or to perform control operations such as PID control (proportional / integral / derivative control) using the analog data, and there is a problem that the data input work for the operation processing becomes very complicated. . On the other hand, in the latter one using the CPU unit, unlike the programmable controller,
However, there is a problem that it is not possible to easily change the setting contents in response to the specification change of each part after the system setting. In particular, addition of an interlock signal can be performed relatively easily by a programmable controller, but there is a problem that it is necessary to recreate all programs when using a CPU unit.

The present invention has been proposed in view of the above points, and solves the problem that the data input of the programmable controller becomes complicated, and even if the specifications of the air conditioner are slightly changed, all of the software programs are It is an object of the present invention to provide an air-conditioning control system that can easily cope with a change in specifications without requiring the trouble of recreating.

[0005]

An air conditioning control system according to the present invention, which has been proposed to achieve the above object, is an air conditioning control system including a programmable controller for performing sequence control of air conditioning equipment. , An arithmetic and control unit is connected to the arithmetic and control unit, data for performing arithmetic processing necessary for air conditioning equipment control is transmitted from the programmable controller, and arithmetic processing is performed by the arithmetic and control unit based on this data. The data is configured to be fed back to the programmable controller.

[0006]

In the air conditioning control system according to the present invention characterized by the above configuration, data for performing control calculation of PID control such as proportional, integral, or differential control necessary for sequence control of air conditioning equipment is sent from the programmable controller. By being transmitted to the arithmetic control unit, desired arithmetic processing is performed in this arithmetic control unit, and the data of the arithmetic result is fed back to the programmable controller. Then, based on the fed-back data, the programmable controller will sequence-control the air conditioner to a predetermined state. Therefore, the programmable controller does not need to execute arithmetic control of complicated data, and the trouble of performing data input for executing complicated arithmetic processing to this programmable controller is eliminated. On the other hand, since the air conditioning equipment is sequence-controlled by the programmable controller until the beginning, even if the specifications of the air conditioning equipment are changed a little, the control such as interlock can be executed by the programmable controller as it is. This makes it possible to easily deal with changes in the specifications of air conditioning equipment without recreating all the programs set in the unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of an air conditioning control system according to the present invention. This air conditioning control system is connected to an air conditioner 1, a programmable controller PLC connected to a driver 2 of the air conditioner 1 via an input / output line L, and a CPU unit 3 of the programmable controller PLC via a data bus 4. The operation control unit 5 is provided.

Of these, the air conditioner 1 includes a housing 10
A filter 11, a heat exchanger 12, a showering device 13, a fan 14 and the like are provided inside, and the fan 14 sucks outside air or room air into the housing 10 to execute an air conditioning process. According to the control signal transmitted from the programmable controller PLC, the driver 2 controls the motors M1 and M2 provided in the valve 15 for supplying hot / cold water of the heat exchanger 12 of the air conditioner 1 and the valve 16 for the showering device 13. Drive and fan 14
Inverter control, etc. are performed. A temperature sensor 17 for measuring a room temperature to be air-conditioned is also connected to the driver 2, and temperature data from the temperature sensor 17 is transmitted to the programmable controller PLC side together with data indicating the operating condition of the fan 14. It is configured to be able to.

The programmable controller PLC is C
A communication unit 30 and an I / O unit 31 are connected to the PU unit 3 via a bus. Among them, the communication unit 30 is a programmable controller PLC
Is connected to the central monitoring system 8 via the control bus 6 and the gate block 7. I / O unit 3
Reference numeral 1 is a unit for executing input / output of signals between the air conditioner 1 side and the CPU unit 3, and as a specific example thereof, an operation control signal (digital) for the fan 14 is provided.
Output fan control signal output unit 31a, fan 14 operation signal (digital) fan input signal input unit 31b, temperature sensor 17 data (analog) input temperature data input unit 31
c, and a valve control signal output unit 3 that outputs a signal (analog) for controlling the opening degree of the valve 15 of the heat exchanger 12.
Those equipped with 1d or the like are applied.

The arithmetic control unit 5 executes desired arithmetic processing as will be described later based on the data transmitted from the CPU unit 3 of the programmable controller PLC connected to the data bus, and outputs the arithmetic processing result data to the CPU unit. It is configured to feed back to 3. In addition, the programmable controller PLC C
The PU unit 3 sends predetermined control data to the I / O unit 31 to execute sequence control of the air conditioner 1 such as an interlock sequence based on the calculation processing result fed back from the calculation control unit 5. Is configured. Incidentally, when transmitting and receiving data between the CPU unit 3 and the arithmetic and control unit 5, means such as a dual port memory is applied.

Next, the operation of the air conditioning control system having the above configuration will be described. First, for convenience of description, the heat exchanger 12
To explain the temperature control by adjusting the valve 15, first, when the room temperature data as an analog signal is input from the temperature sensor 17 to the temperature data input unit 31c of the programmable controller PLC, this signal is converted into a digital signal. It is sent to the CPU unit 3. Then, the CPU unit 3 sends the data to the arithmetic control unit 5, and the arithmetic control unit 5 performs arithmetic processing of the proportional operation based on this data. That is,
For example, as shown in FIG. 2, when the set point SP (set temperature), the gradient H / C of the hot water coil, and the gradient C / C of the cold water coil are given as parameters, data of the measured temperature n at room temperature is given. Then, the arithmetic and control unit 5 calculates the opening degree m [%] of the valve 15 at that time. Then, the calculated data m is obtained from the arithmetic and control unit 5 by C
It is fed back to the PU unit 3 side. Then, the CPU unit 3 causes the valve control signal output unit 31d to output a signal for setting the opening of the valve 15 of the heat exchanger 12 to m [%], and drives the motor M1 to open the opening of the valve 15. Adjust. Such control is
The air-conditioning is automatically controlled by being repeatedly executed at regular time intervals.

FIG. 3 is an explanatory diagram showing the above-mentioned series of control procedures, and the data flow is in the order shown by arrows No. 1 to No. 7 in FIG. In such a control procedure, the arithmetic processing of the opening degree m of the valve 15, which is difficult for the programmable controller PLC, is properly processed by the arithmetic control unit 5, and the programmable controller P is based on the arithmetic result.
The LC can properly control the sequence of the air conditioner 1. In the above, the case of temperature setting has been described as an example, but the present invention is not limited to this, and fan operation control other than temperature setting, dehumidification, and other air conditioning processing control are controlled in the same procedure. It is possible.

[0013]

As can be understood from the above description, according to the air conditioning control system of the present invention, the complicated data arithmetic processing required for controlling the air conditioning equipment can be easily executed by the arithmetic control unit. , It is possible to eliminate the drawback that the data input of the programmable controller becomes complicated, and since the air conditioning equipment is sequence controlled by the programmable controller until the end, even if the specifications of the air conditioning equipment are changed slightly, The control such as interlock can be executed as it is, and the special effect that the specification change of the air conditioner can be easily dealt with is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an air conditioning control system according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a relationship between a measured temperature / set temperature and a valve opening degree used in a calculation process executed by a calculation control unit of the air conditioning control system shown in FIG.

FIG. 3 is an explanatory view showing a data flow procedure when temperature control is executed in the air conditioning control system shown in FIG. 1.

[Explanation of symbols]

 1 Air Conditioner 2 Driver 3 CPU Unit 4 Data Bus 5 Calculation Control Unit 12 Heat Exchanger 14 Fan 15 Valve 17 Temperature Sensor 31 I / O Unit 31a Fan Control Signal Output Unit 31b Fan Operation Signal Input Unit 31c Temperature Data Input Unit 31d Valve Control Signal output unit PLC Programmable controller

Claims (1)

[Claims] 1. An air conditioning control system comprising a programmable controller for performing sequence control of an air conditioning equipment, wherein an arithmetic control unit is connected to the programmable controller, and the arithmetic control unit is provided with arithmetic processing required for air conditioning equipment control. The air-conditioning control system is configured so that data for performing the above is transmitted from the programmable controller, and the data processed by the arithmetic control unit based on this data is fed back to the programmable controller.