JPH02128115A - Digital display device - Google Patents

Abstract

PURPOSE:To achieve easier addition of an abnormality display item while facilitating the instrumental arrangement of a monitoring disc and the checking of abnormality by an operator by arranging an abnormality detection means and a display control means. CONSTITUTION:A sensor 11 detects a water level of an inflow weir. An abnormality detection means 20 detects abnormality of the sensor 11 and abnormality in a water level to be detected. An output of a code conversion means 12 and an output of the abnormality detection means 20 are inputted into a display control means 30 separately. In operation, when no abnormality is detected, a sensor output coded is shown on a digital display device 1. When abnormality is detected, the sensor output coded and an error code are shown alternately on the digital display device 1. As a result, even when a number of process abnormalities containing a sensor abnormality are monitored, a trouble display device is eliminated while checking of abnormality by an operator can be facilitated. This also enables flexible adaptation with the addition of a code number even when an abnormality display item is added.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a digital display device that encodes a detected amount of a sensor by a code conversion means and displays the encoded amount on a digital display.

(Prior art) Digital indicators are often used to monitor plant process values in water supply and sewage facilities, etc.
As shown in FIG. 8, a digital display 1.2 is arranged, one of which displays the inflow conduit water level, and the other of which displays the pump well water level.

In this case, only the water level is displayed on the digital displays 1 and 2, and an upper limit abnormality in which the water level exceeds the allowable limit is indicated.
In case of a lower limit abnormality that falls below the permissible limit or an abnormality in the sensor itself, another indicator 3 is provided as shown in FIG.
The indicator corresponding to an abnormality or failure was lit or blinking.

(Problem to be Solved by the Invention) When the digital display described above is attached to a monitoring panel to monitor process values such as water level, and also to monitor abnormalities including sensors, there will be three times as many failure indicators as sensors. Is required. For this reason, in addition to having difficulty arranging equipment on the monitoring panel, there are also problems from the operator's perspective, such as the fact that it takes time to find a digital display that corresponds to a fault indicator.

Furthermore, when it is necessary to add process abnormality display items due to changes in plans after plant operation, etc., there is also the problem that adding trouble indicators is accompanied by many difficulties.

This invention was made to solve the above problems, and even when monitoring a large number of process abnormalities including sensors, it is possible to facilitate the arrangement of equipment on the monitoring panel and to facilitate the operator's confirmation of abnormalities. Another object of the present invention is to provide a digital display device in which abnormal display items can be easily added.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes an abnormality detection means for detecting an abnormality in a sensor and an abnormal state of a detection target of the sensor, and an error code corresponding to the abnormality when the abnormality detection means detects the abnormality. The present invention is characterized by comprising display control means for generating the error code and alternately displaying the error code and the output code of the code conversion means on a digital display.

(Function) In this invention, an abnormality in the sensor and an abnormal state of the object to be detected by the sensor are detected, and when an abnormality is detected, the encoded sensor output and the error code are alternately displayed on the digital display. .

(Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, it is assumed that a sensor 11 detects the water level of the inflow flux, and this sensor output is taken into the code conversion means 12 and converted into a binary coded decimal code (BCD). Further, an abnormality detection means 20 is provided to detect an abnormality in the sensor 11 and an abnormality in the water level to be detected.

The abnormality detection means 20 includes a sensor abnormality detection section 21 that detects an abnormality in the sensor, an abnormal water level high detection section 22 that detects an abnormal water level based on the output signal of the sensor 11, and an abnormal water level detection section 22 that detects an abnormal water level based on the output signal of the sensor 11. It is composed of an abnormally low water level detection section 23 that detects paper. Further, the output of the code conversion means 12 and the output of the abnormality detection means 20 are respectively input to the display control means 30. This display control means 3
0 includes an error code generation unit 31 that generates an error code corresponding to the abnormality depending on which of the abnormality detection units 21, 22, and 23 detects the abnormality; and this error code generation unit 31 generates an error code. If not, the output of the code conversion means 12 is statically displayed on the digital display 1, and when an error code is generated, this error code and the output code of the code conversion means 12 are alternately displayed on the digital display 1, and the error code is displayed on the digital display 1. The control unit 32 is configured to flicker display the code.

The above description has been made regarding the portion corresponding to the sensor 11 that detects the water level of the inflow flux, but similar means are provided for other sensors that detect the water level of the pump well.

The operation of this embodiment configured as described above will be explained below.

First, when the sensor 11 detects the water level of the inflow flux and sends a detection signal to the code conversion means 12, the code conversion means 1
2 converts these detection signals into BCD and applies them to the control section 32. At this time, if the abnormality detection means 20 does not detect any abnormality, the control section 32 provides the encoded output of the sensor 11 to the digital display 1. As a result,
As shown in FIG. 2, the inflow channel water level is statically displayed on the digital display 1. Further, the pump well water level is statically displayed on the digital display 2 by a similar means (not shown).

Next, when an upper limit abnormality (HH abnormality) in the water level of the inflow flux occurs, the water level abnormal high detection section 22 detects this based on the output signal of the sensor 11. At this time, the error code generation section 31 generates an error code E2 corresponding to the abnormally high water level, and in response to this, the control section 32 digitally converts this error code and the output code of the code conversion means 12 alternately for a predetermined period of time. The error code is displayed on the display 1, and the error code is displayed in flicker mode. As a result, as shown in FIG. 3, the inflow channel water level and the abnormality code (here, the flickering abnormality code E2 is shown) are alternately displayed on the digital display 1.

Next, if a lower limit abnormality (LL abnormality) in the water level of the inflow flux occurs, the abnormal low water level detection section 23 detects this based on the output signal of the sensor 11. At this time, the error code generation section 31 generates an error code E3 corresponding to the abnormally high water level, and in response to this, the control section 32 digitally converts this error code and the output code of the code conversion means 12 alternately for a predetermined period of time. The error code is displayed on the display 1, and the error code is displayed in flicker mode.

Next, when an abnormality occurs in the sensor 11 itself, the sensor abnormality detection section 21 detects this abnormality, and the error code generation section 31 generates an error code E1 corresponding to this abnormality. The control unit 32 displays this statically.

In this case, the error codes El, E2. If a table as shown in FIG. 4 showing what kind of abnormality E3 means is provided near the display, the contents of the abnormality can be ascertained from the contents displayed on the digital display.

When displaying process values, it is common to set the display update cycle to a few seconds to a dozen or more seconds in order to eliminate display fluctuations in the lowest digit of the digital display, and according to this update cycle, the water level is All you have to do is decide the display time.

FIGS. 5 and 6 are flowcharts showing the processing procedure when the functions of the code conversion means 12, abnormality detection means 20, and display control means 30 described above are provided in a microcomputer.

That is, in step 101 it is determined whether or not there is a sensor abnormality, and if there is an abnormality, an error code E1 flag is set in step 102. If there is no abnormality, it is determined in step 103 whether there is an upper limit abnormality in the water level, and if there is an abnormality, an error code E2 flag is set in step 104. Furthermore, if it is determined that there is no abnormality in the upper limit of the water level, it is determined in step 105 whether or not there is an abnormality in the lower limit of the water level;
If there is an abnormality, an error code E3 flag is set in step 104.

In the process of this processing, if it is determined that there is no abnormality in both the sensor and the water level, the sensor output is converted to BCD in step 107, and further, after confirming that there is no abnormality in step 108, the conversion is performed in step 109. The water level is statically displayed on the digital display 1.

On the other hand, when the flags are set in steps 102, 104, and 106, the error code and process display program, ie, the process shown in FIG. 6, is executed in step 110. In this case, it is determined in step 111 whether or not there is a sensor error, and if there is a sensor error, the error code E1 is statically displayed in step 112 and the display process is ended. And if it is not a sensor error, step 1
At step 13, it is determined whether or not the upper limit of the water level is abnormal. If the upper limit is abnormal, an error code E2 is flicker displayed at step 114, and the display time is counted by the timer T1. and,
If the water level is not abnormal, or after the timer T1 times out, it is determined in step 115 whether or not the water level lower limit is abnormal. If the water level is abnormal, the error code E3 is flickered in step 116, and the display time is counted by timer T2. do. Then, when there is no water level lower limit abnormality or after the timer T2 times out, the process value is displayed statically.

In this case, the processing in steps 101 to 106 in FIG. 5 corresponds to the abnormality detection means 20 in FIG. 1, and the processing in steps 108 to 110 corresponds to the display control means 30 in FIG. 1, respectively.

FIG. 7 is a time chart showing the display state when a water level abnormality occurs. The error code is flickered for a time set by a timer, and this flicker display and the process value are alternately displayed.

Thus, according to this embodiment, the process value and error code corresponding to one sensor are displayed on one digital display, so there is no need for a fault indicator, and when the digital display is installed on the monitoring panel. However, the equipment arrangement for the monitoring panel becomes extremely easy. Furthermore, since process values and error codes are alternately displayed on one display, it is extremely easy for the operator to check for abnormalities. moreover,
Even when adding a process abnormality item, it can be handled by adding a program and an error code.

In addition, in order to simplify the explanation, in this embodiment, the case where the inflow channel water level is detected and displayed is explained.
The pump well water level can also be displayed in a similar way using exactly the same means.

Furthermore, it goes without saying that the present invention is applicable not only to the display of inflow conduit water levels and pump well water levels, but also to other devices that detect physical quantities that change over time and display them digitally.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, an error code is created by detecting a sensor abnormality and an abnormal state of the object detected by the sensor, and when no abnormality is detected, the coded sensor output is digitally displayed. When an abnormality is detected, the encoded sensor output and error code are displayed alternately on the digital display, so even when monitoring a large number of process abnormalities, including sensor abnormalities, failures can be avoided. This eliminates the need for a display, makes it easier for the operator to check for abnormalities, and even when adding abnormality display items, it is possible to respond flexibly by adding code numbers.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
Figures 2 and 3 are display examples of the digital display that constitutes the same embodiment, Figure 4 is a chart comparing the display example and the details of the abnormality, and Figures 5 and 6 constitute the same embodiment. Flowchart showing the processing procedure of the microcomputer, FIG. 7 is a time chart for explaining the operation of the same embodiment, FIG. 8 is a display example of a conventional digital display device, and FIG. 9 is a diagram accompanying this digital display device. This is an example of a display on a failure indicator. 1.2...Digital display, 3...Fault indicator. 11... Sensor, 12... Code conversion means, 20.
... Abnormality detection means, 21 ... Sensor abnormality detection section, 22
. . . Water level abnormal high detection unit, 23 . . . Water level abnormality low detection unit, 30 .

Claims (1)

[Claims] A digital display device that encodes the detected amount of a sensor by a code converting means and displays it on a digital display, the abnormality detection means detecting an abnormality in the sensor and an abnormal state of the object to be detected by the sensor; a display control means for generating an error code corresponding to an abnormality when detecting the abnormality, and displaying the error code and an output code of the code converting means alternately on the digital display. Display device.