JPS6066111A - Data display device - Google Patents

Abstract

PURPOSE:To suppose a future value of a data by displaying not only a present value of the data but also a variation direction and a variation speed of the data by a simple symbol. CONSTITUTION:A process variate by a sensor 1 is brought to digital conversion to a BCD code, etc. suitable for a numerical display by a converter 2 and displayed on a present value diaplay part 31 of a display device 30. On the other hand, an output of the converter 2 is supplied to an operating circuit 4 and an integral value V of a variation quantity in a prescribed time of the converted output is calculated. This integral value V is compared with an absolute value of a value P determined by the first deciding circuit 5, to which range based on an expression it belongs is decided, and a variation direction is displayed on a variation direction display part 32 by symbols 33-35. Also, by a comparison of the integral value V and the range set in advanced, the second deciding circuit 6 decides a variation speed and varies a display color of the symbols 33-35. By these displays, a future value of a data can be supposed easily and quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data display device for displaying plant process variables such as temperature and pressure.

[Prior art]

Conventionally, there has been a device shown in FIG. 1 as this type of device. In the figure, (11 is a sensor that converts temperature, pressure, etc. into a voltage signal. +21 is a converter, (3) is a display device, and converter (2) is a voltage signal from sensor (1). is input and converted into data suitable for display on the display device (3).

The output from the sensor (1) is generally an analog signal, and the converter (2) converts it into a digital signal by means of an analog-to-digital conversion circuit, and displays the display device (72: case 31 is formed by a numeric display tube). converts digital signals into BCD (binary coded decimal)
) The display device (3) is a cathode ray tube display device, and the dot pattern of the number is read out using the character code representing the number as an address. If it is a display device that displays numbers, BCD
The code for each decimal digit of the code is converted into a character code representing that number. For example, if the measurement target of sensor (1) is temperature and a measured value of 53.4°C is obtained, the character 53.4°C will be displayed on the display (31); .4 is a variable display determined by the output voltage of the sensor (1), and °C is a fixed display determined by the type of sensor (1).

Data corresponding to this variable display is outputted from the converter (3) as data suitable for display on the display device (3).

Since the conventional data display device is configured as described above, it has the disadvantage that it is necessary to monitor changes in the display on the display device (3) for a while in order to know the direction in which the data is changing. Ta.

[Summary of the invention]

This invention has been made in order to eliminate the drawbacks of the more conventional methods described above.In this invention, the present invention displays simple symbols indicating the direction and speed of change of the data together with the current value of the data. It is now possible to predict future values. Therefore, in this invention, a change direction judgment circuit is provided which integrates the data change plan within a predetermined period of time in the past starting from the current point in time, and classifies the integrated value of the amount of change into predetermined steps. The display device is configured to display different symbols in different colors depending on whether the stairs are mapped.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing one embodiment of the present invention.
The same reference numerals as those in the figure indicate the same or equivalent parts, and (30) is a display device corresponding to the display device (3) in FIG. 1, which includes a current value display section (3υ) and a change direction display section (32). There is.

(41 is an arithmetic circuit, (5; is a first judgment circuit, and (6) is a second judgment circuit.

FIG. 3 is a diagram showing the state of change in data D during a predetermined time T, when time T up to past time t1 is expressed as T=tn-tl from the current time 111 as a starting point. Sampling period (t2-tl) = (t3
-t2) =...T/(n-ri).If the data D changes as shown in Figure 3(a) according to time t, the amount of change ΔD is as shown in Figure 3(b). If you show it, it will turn out, Δ
The integral value V of D is the difference between the upper shaded area and the lower shaded area of Δ1)=0 in FIG. 3(b), and this is the difference between the value of data D at tn and the value of data D at t D.I.
It is clear that it is equal to the amount of money reduced.

That is, the integral value vl of the amount of change in data D within a predetermined time
It is given by I'1v=Dn-D□.

FIG. 4 is a block diagram showing a design example of the arithmetic circuit (41) in FIG. 2, in which (40) to (47) are n-bit shift registers, and (48) is a subtracter. ) is represented by 8 binary bits, then those 8 bits are input to each serial signal input terminal of shift registers (4o) to (47), and a clock signal of T/(n-1) is generated. , the left input of the subtractor (48) becomes t=t
Data at n) When n, right-hand entry h t =
The output of the subtracter (48) from the data D at t becomes V=Dn-D□.

The first determination circuit (5) is an arithmetic circuit (41 output Vfjc
A first code representing V>+lPl according to the relationship between the value of ■ and the predetermined absolute value IP+.

+IP1≧V≧−IPI second code, v<−1
A third code representing p1 is displayed on the change direction display section (32).

The operation in which the output direction of the converter (2) is displayed on the current value display section (31) is as explained in connection with FIG. The result will be as shown in Figure 5. In Figure 5 (33).

Each of the figures shown in (34) and (35) is a figure that is displayed when the first, second, and third codes are respectively output from the first determination circuit (51). You can instantly determine the direction of change in the data displayed on the current value display section (3υ).

Furthermore, in this output EiIJ, the magnitude of the absolute value IVI of V is determined by the second determination circuit (61), and the display colors of the arrows (33) and (35) shown in FIG. 5 are changed according to this determination.

FIG. 6 is a diagram showing an example of the display of the change direction display section (32) in FIG. 2, and in FIG.
When I and IVI > IAI (7), red display, IAI
≧IVI ＞Yellow display when IBI, 1812m ＞
When it is IPI, it is displayed in blue. +IPI≧V≧−I
The symbol for P+ may also be displayed in blue.

That is, the signal that determines the display symbol is sent to the first judgment circuit (5
1 is also output, a signal determining the display color is output from the second judgment circuit 161, and the second judgment circuit +6)
> IAI, lAl5m > IBI, IB
The output signal is determined according to the I 2m determination.

The display shown in FIG. 6 allows instantaneous estimation of not only the direction of data change but also the speed of change.

〔Effect of the invention〕

As described above, according to the present invention, the data display device is configured to be able to display not only the current state of data, but also the direction and speed of change. to accurately understand the status of process variables.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional device, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a diagram showing temporal changes in data, and Fig. 4 is the arithmetic circuit of Fig. 2. FIG. 5 is a block diagram showing an example of the design of the change direction display section in FIG. It is a figure which shows an example gold|metal|money. (1)...sensor, (2)...converter, (30)...
・Display device, (3υ...Current location display unit, (32)・
... Change direction display section, (41... Arithmetic circuit, (5)
...First judgment circuit, (61...Second judgment circuit. The same reference numerals in each figure indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 4

Claims (1)

[Scope of Claims] A converter that inputs all process variables and converts them into data in a format suitable for numerical display, an arithmetic circuit that calculates the integral value V of the amount of change in the output of this converter within a predetermined time, and this arithmetic circuit. Input the output v of the circuit and calculate the fixed meta absolute value IPI K vs. t in advance.
, v>+1p+, +lPl≧V≧-IP1゜V<-I
A first judgment circuit that makes a full judgment as to which of the ranges of PI it belongs to and outputs a signal representing the range in which it is applied; A second determination circuit determines which range it belongs to and outputs a signal indicating the range +W to which it belongs, and the output data of the converter is numerically displayed on the current value display section, and the q1 A data display comprising a display device in which a symbol of a Japanese cedar corresponding to each of the ore output stations 1c is displayed in a change direction display section, and a display color of the symbol display is determined according to the output of the second judgment circuit. Device.