JPS60199238A - Scale converting device - Google Patents

Abstract

PURPOSE:To make the device inexpensive and miniaturized and also to make the scale conversion accurate and simple by using a ROM whose address is stored with a digital data applied with scale conversion for each number of addresses number, and applying scale conversion. CONSTITUTION:In applying scale conversion with respect to the measuring item of voltage 0-66kV for example, a selected contact S1 is closed by a selection circuit SL, the said item is selected and also a ROM(M1) having a corresponding conversion scale (e.g., 0-500 0-660) is selected. Thus, the measurement data of voltage 0-66kV is converted into an analog data of 0-5V by a transducer TD1, converted into a digital data of 0-500 by an A/D converter AD, it is inputted to an address of the ROM(M1) and the digital data of 0-660 after conversion is outputted from the said ROM(M1).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital data scale conversion device.

[Prior art]

In general, in a controlled station such as a remote monitoring and control device, when transmitting measurement data such as voltage and current from external equipment to the control station, the maximum measurement range of voltage and current fluctuation, such as voltage O
~66KV, current 0~400A with transducer
After converting to ~5■, use the ~■ converter to convert it to, for example, 0
The control center converts the received digital data to ~500 digital data and transmits it to an electronic aEO ~500.
Predetermined processing and display are carried out and completed in correspondence with 66KV and 0 to 400A.

By the way, in the above, when lowering the accuracy of measurement data or changing measurement items, for example, O~500
In some cases, digital data of 0 to 700 is required rather than digital data of 0 to 700, and so-called scale conversion of the digital data is required.

As a conventional scale conversion device of this kind, the first
As shown in the figure, there are those that use a microcomputer or an arithmetic unit, and those that use a voltage dividing resistor as shown in Figure 2.

In other words, what is shown in Fig. 1 converts the maximum measurement range of each measurement data into analog data of 0 to 5V for each item with a transducer for n types of measurement items such as voltage and current. Then, each analog data is input to the A/D converter II+ through the selection contacts (sl) to (sn), and the analog data is inputted to the A/D converter II+ from 0 to 5 at the A/D converter +ll.
After converting the analog data of (2) into digital data of 0 to 500, it is output through the entire scale conversion arithmetic unit 121 (2). Note that (3) is a selection circuit that selects n selection contacts tS,>~(Sn).

When performing scale conversion, the digital data of 0 to 500 outputted from the A/D converter (projector 11) is converted to a desired conversion scale, for example, 0 in the arithmetic unit 12).
~700 to obtain digital data after scale conversion.

Also, the one shown in Figure 2 is a transducer with 0 to 5
Input each measurement data converted into analog data of The partial pressure is divided according to the scale, and this is converted to the width converter 11.
) to obtain digital data after scale conversion.

However, according to the conventional scale conversion device, in the case of FIG. 1, a scale conversion calculation device (2) or an alternative microcomputer is required, which has the drawback that the device is large in size and expensive. Also, in the case of FIG. 2, since a resistor is used, there is a disadvantage that the conversion error becomes large.

[Purpose of the invention]

This invention was made with the above points in mind,
To perform scale conversion using a ROM in which two sets of digital data obtained by converting the scale of the number of cedar moss addresses are stored in each address address, thereby making the device inexpensive and compact, and at the same time making the scale conversion accurate and simple. With the goal.

[Structure of the invention]

The present invention is a scale conversion device for digital data, in which digital data obtained by converting each address number at a predetermined conversion scale is stored in advance in address addresses equal to the capacity of input digital data from the minimum to the maximum. This is a scale conversion device characterized in that a ROM f is provided, and input digital data is obtained from an address of the ROM after being converted to a digital scale.

〔Effect of the invention〕

Therefore, according to the scale conversion device of the present invention, by inputting the input digital data to the address of the ROM, digital data at an address equal to the input digital data, that is, digital data obtained by converting the input digital data at a predetermined conversion scale can be obtained. you can get
Scale conversion can be performed simply without using a microcomputer, arithmetic device, etc. as in the past, and there is no conversion error that occurs when using a voltage dividing resistor 6, resulting in accurate scale conversion. It is extremely convenient because the scale value can be changed by exchanging the H and OM in which the digital data has been converted by a different conversion scale.

〔Example〕

The present invention will now be explained in detail with reference to the drawings from FIG. 3 showing one embodiment thereof.

In these drawings, (TDl) to (TDnJ are transducers, and the maximum measurement Th'p range of each measurement data for n types of measurement items at the remote monitoring side/distribution equipment's Matsu control center, etc. , for example 4r'EO~66
Converts KV, current 0~400A, etc. into analog data of 0~5■. 'S+) ~ l5n) is the selection contact, FAI
)) is an A/D converter, and each transducer rTI
), ) to (TDn) are connected in parallel to the converter (AA) by valving the selection contacts (Sl) to (Sn), respectively.
D) For example, digital data of 0 to 500 is output in 12 bits in response to input analog data of 0 to 5.

fM+) to CMm) are scale conversion ROMs, each of which is constructed using two 8-bit) ROMs, and A/
D converter (0 to 500 digital data from ADI 1
'J) Each ROM (M+J - (Mm) (7)
It is input to the 12-bit address. Each of these It O
M fM, ) to (Mm) are the address addresses equal to the capacity of the input digital data from the minimum to the maximum, that is, addresses 0 to 500, and the number of addresses for each address on a predetermined conversion scale. The converted digital data is stored in advance, and m ROMs (M,) to (
Mm) are set to have different conversion scales. Here, each measurement item is set to 1. (OM fM,) − (Mm) and H[
The conversion scale according to the measurement term [C is 140 M (M,) each
~(V may be set to MmJ. (SL) is each selected concubine point (Sl) ~ [Snl is changed to select the A1 side item and has a Gifu scale according to the measurement item. This is a selection circuit that selects 4j from ROM (Ml) to fM+n J, and the ROM to be selected is −(M 1) −(
Selection is made by manually inputting a select signal to the chip select terminal (C8) of Mml.

Note that each ROM [Ml) −(Mm) is
7) 7) 'L/space value and the data value stored in the address value number ilb, usually the solid line, broken line,
Although there is a linear relationship, that is, a proportional relationship, as shown in the dashed line, it is also possible to have a curved relationship as shown in the solid or broken line in FIG. 1 (1) if necessary.

Then, a certain tr measurement item, for example, voltage O ~ 66 KV
When performing scale conversion on a measurement item, the selection circuit (SL) brings the selection contact (S, ) into contact to select the item, and also converts the corresponding conversion scale (for example, O~500-Q~ R (JM) with 660 catties
(M,) is selected. Therefore, th pressure 0 to 66
The measurement data of KV is transferred to the analog data of 0 to 5 by the transducer (1'l), and the A
ID change 4 a (AD) is converted to digital data from 0 to 500, this is input to the address of R, OM (M, 1), and the converted 0 is sent from m ROM (Ml).
~660 digital data are output.

For example, in the measurement items, 33. When measuring OKV's pressure, 2.50V analog data is obtained from the transducer ('l'D,), and A
/]] 250 digital data is output from the conversion W (AD), and this is manually input to the address of the ROM fM,). Kokote, ROM (1vI,) K is located at address 250, 3306, and digital data is stored in advance, so by inputting the digital data of 250 to the address, the change of υ330 and the digital data of υ330 can be obtained.

In addition, in the above description, when changing the scale value, it is sufficient to switch ROM (M,)-(Mm+) from the selection circuit (SL) K or to set the ROM of the desired scale value to 1).

Therefore, according to the embodiment, each of the ROMs fM, ) to CMl, in which digital data obtained by varying the number of address addresses at a predetermined conversion scale is stored in each address address.
By using 11), scale conversion can be performed extremely easily, there is no need to use a conventional arithmetic device, etc., and the device can be made inexpensive and compact.
The conversion error can also be reduced, and changing the scale value can be done by simply switching or exchanging ROMCM, ) to (Mm), and various J'LOM fAj) -
(is'1In) allows various scale conversions to be performed, which is extremely useful.

Note that although the scale of measurement data at the controlled station has been described above, it goes without saying that the scale conversion of other digital data can also be carried out in the same way.

[Brief explanation of drawings]

Figures 1 and 2 are block diagrams of conventional scale conversion devices, respectively, Figure 3 and the following figures show one implementation of the scale conversion device of the present invention, and Figure 3 is a block diagram;
'44 (The figure is an explanatory diagram of ROM, Figure 45 (a) and (b)
) are examples of relationship diagrams between address values and data values in the ROM. (M,) ~(Mm J-ROM. Representative Patent Attorney Fuji 1) Ryutabe Figure 5 (a) (b)

Claims (1)

[Claims] ■ In a digital data scale conversion device. A ROM is provided in which digital data obtained by converting each address address a at a predetermined conversion scale is stored in advance at an address address equal to each position from the minimum to the maximum of the input digital data, and the input digital data is stored in the ROM.
1. A scale conversion device that obtains scale-converted digital data by inputting it to an address of .