JPH0567292A - System for compensating measured value - Google Patents

Abstract

PURPOSE:To simplify the analog circuit of a sensor IO part so as to facilitate a device and also facilitate the adjusting work of a compensating value at every especially concerning the compensating method of analog data in relation to a measurement system where measured data from the various kinds of sensors is transmitted to the center device with a transmission line in the building management system, etc. CONSTITUTION:A measurement transmitting device 1 connected with the plural sensors 3 inputting the analog actual measured value collects the actual measuremed values from the respective sensors 3 and converts them into digital measured data so as to transmit it to the center device with the transmission line 4 in the measurement system. In the measurement system, a storing part 16 storing a microprogram which controls are measurement transmitting device 1 is provided with a digital compensation value area storing the digital compensation value being intrinsic in the respective sensors so that the compensation value is set from the center device 2. Then, data compensated by the digital compensation value after the analog actual measured value is converted into the digital value is transmitted at the time of transmission request from the center device 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measurement system for transmitting measurement data from various sensors to a center device in a building management system or the like via a transmission line, and more particularly to a method for correcting measured analog data.

[0002]

2. Description of the Related Art In a building management device or the like, in order to control an air conditioning facility, the temperature and humidity in a room are automatically measured and transmitted to a center device. Normally, measurement transmission devices are distributed on each floor, and analog measurement data from sensors in each room on the same floor are collected, converted into digital data, and transmitted to the center device in the control room.

FIG. 4 shows a conventional measurement and transmission device. The analog measurement values such as the temperature and the humidity, which are represented by the current value and the resistance value from each sensor 3, are constantly input to the sensor IO unit 11 including the analog circuit provided for each sensor, and the center device 2 When the measurement request of 1 is received via the transmission line 4, each sensor IO unit 11 is sequentially scanned by the instruction of the processing unit 13 having a microprocessor to capture an analog measurement value, and the IO conversion unit 14 converts the analog measurement value into digital data. After that, the processing unit 13 controls the scale conversion into values such as temperature and humidity, and a plurality of measurement data is assembled into a predetermined transmission frame, and the line unit unit 15 and the transmission line 4 are connected.
It is sent to the center device 2 in the center via. The storage unit 16 is composed of a rewritable memory, and is provided with a microprogram storage area 16c for controlling the operation of the processing unit 13 and a work area 16a necessary for processing.

By the way, a sensor for measuring temperature is installed near a wall or ceiling so as not to impair habitability. However, since there is a temperature distribution inside the room, a temperature different from the temperature actually felt by the occupant is used. It is often measured. In addition, since the transmission line length between the sensor and the measurement transmission device differs depending on the installation location of the sensor and the resistance value differs, the sensor I
An error peculiar to the sensor occurs in the analog value input to the O section. In order to correct these so that the correct value can be measured, it is necessary to correct the measured value for each sensor. Therefore, in the conventional measurement transmission device, each sensor IO
The section is provided with a correction circuit 11a for correcting the analog data for each of these sensors, and the IO conversion section performs digital conversion using the corrected analog data.

[0005]

That is, conventionally, for example, the resistance value of a resistance temperature detector is measured, and after this correction is performed by an analog circuit, it is converted into a digital value and a scaling operation is performed from this digital resistance value. Then, the temperature was converted into a digital value representing the temperature, and the digital value was transmitted to the center device. Therefore, it is necessary to provide the analog correction circuit 12a for each sensor, which causes a problem that the device becomes complicated. Also, since this measurement transmission device is installed in the machine room on each floor of the building and is difficult for maintenance personnel to work, when setting the correction value for each sensor, go to each installation location and check the analog correction circuit. There is also a problem that work such as adjusting the semi-fixed resistance is troublesome.

The present invention has been made in view of these problems, and simplifies the device by simplifying the analog circuit of the sensor IO unit and simplifies the adjustment work of the correction value for each sensor. The purpose is to

[0007]

FIG. 1 is a block diagram showing the principle of the measurement value correction system according to the present invention. In order to solve the above-mentioned problems, the measurement value correction method of the present invention uses, as shown in FIG. In a measurement system in which values are collected and converted into digital measurement data, and then transmitted to the center device 2 via the transmission line 4,
A storage unit 11 that stores a microprogram for controlling the measurement and transmission device is provided with a digital correction value area for presetting a digital correction value unique to each sensor. The digital correction value is converted into a digital value, and then the data corrected by the digital correction value is transmitted. Further, the digital correction value can be set from the center device through a transmission line. is there.

[0008]

Since the analog measurement value is converted into a digital value and then corrected, an analog correction circuit is not required, and the circuit configuration of the measurement transmission device is simplified. Further, the correction value for each sensor can be collectively set from the center device by rewriting the digital correction value in the storage unit of the measurement transmission device via the transmission line, and the hardware of the analog circuit can be set for each sensor. The fine adjustment does not have to be performed at the installation locations of the individual measurement transmission devices that are distributed, and the handling is improved.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a block diagram of the measurement transmission device in the embodiment of the present invention, and FIG. 3 is a flowchart showing the operation of the measurement transmission device. Note that the same reference numeral represents the same object throughout the drawings.

In FIG. 2, a feature of the present invention is that a digital correction value area is provided in a storage section that the measurement transmission apparatus 1 has in the past, and this correction value can be set from the center unit, and the sensor IO section 11 Since the analog correction circuit has been deleted from the above, the other parts are the same as those in the conventional technique described above with reference to FIG.

In FIG. 2, the storage unit 16 is provided with a digital correction value area 16b in addition to the conventional work area 16a and program area 16c. Digital correction value area 16
In b, digital correction values corresponding to each of the plurality of sensors measured by the measurement transmission device can be set remotely from the center device 2 via the transmission line 4.
The setting of this correction value is set so that the digital measurement value becomes equal to the actual measurement data based on the actual measurement data at each sensor installation location, and the setting of the corresponding measurement transmission device from the console of the center device 2 via the transmission line 4 is performed. It is written in advance in the sensor address of the digital correction value area 16b of the storage unit 16.

FIG. 3 shows the operation of the measurement and transmission device having the above configuration.
The flowchart will be described. The center device sends a measurement request command of each sensor to the measurement transmission device through the transmission line. In each measurement transmission device, the processing unit analyzes the command received via the communication unit unit (S
1). If it is a measurement request, each sensor IO unit is scanned to capture the analog measurement value from the sensor (S2). The IO converter converts the captured analog measurement value into a digital value, and then performs scale conversion processing using a fixed constant for conversion set in the work area to convert temperature, humidity, etc. into a digital value in BCD expression, for example. Yes (S3). A digital correction value corresponding to each measurement item (sensor) is obtained from the digital correction value area of the storage unit (S
4). The digital measured value obtained previously is corrected using the digital correction value. (S5) The corrected digital measurement value is returned to the center device via the transmission line (S6). The center device displays the returned digital measurement value on the display unit 21 and uses it for control.

[0013]

As described above, according to the present invention, it is possible to easily set the correction value of the measurement data because the correction data of each sense can be set by the digital value in the storage unit of the measurement transmission device. In addition, since the analog correction circuit can be omitted, the device can be simplified.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of a measurement value correction method according to the present invention.

FIG. 2 is a block diagram of a measurement transmission device according to an embodiment of the present invention.

FIG. 3 is an operation flowchart of the measurement transmission device.

FIG. 4 is a block diagram of a conventional measurement transmission device.

[Explanation of symbols]

1 ... Measurement transmission device, 11 ... Sensor IO unit, 13 ... Processing unit, 14
... IO conversion section, 15 ... Line interface section, 16 ... Storage section, 16b ... Digital correction value area, 2 ... Center device, 3
… Sensors, 4… Transmission lines

Claims (2)

[Claims] 1. A plurality of sensors for inputting analog measured values
The measurement transmission device (1) to which (3) is connected collects analog measurement values from each sensor (3) and converts them into digital measurement data, and then transmits them to the center device (2) via the transmission line 4. In the measurement system, the storage unit (16) for storing the microprogram for controlling the measurement transmission device (1) is provided with a digital correction value area (16b) for presetting a digital correction value unique to each sensor, When a transmission request is issued from the device (2), the measured value correction method is characterized in that the analog measured value is converted into a digital value and then the data corrected with the digital correction value is transmitted. 2. The measurement value correction method according to claim 1, wherein the digital correction value can be set from the center device (2) via a transmission line.