JP3522951B2 - Display device with abnormality detection function - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device which constitutes a charge transaction device for calculating and displaying charges for electricity, gas, water, etc., and more specifically, to detect an abnormality in displayed weighing data. The present invention relates to a display device having a function of detecting an abnormality.

[0002]

2. Description of the Related Art As shown in FIG. 9, a display device of a charge transaction instrument such as an electricity meter, a water meter, a gas meter, etc. for displaying the usage amount and usage charge of electricity, gas, water, etc. And a display driver 93 including a data register 93a and a segment data conversion unit 93b, and a display unit 95 including a liquid crystal display or an LED display. The arithmetic unit 91 composed of a one-chip microcomputer executes a program, calculates the amount of electricity, gas, water, etc. used, manages time, creates measurement data and clock data, and supplies them to the display driver 93.

The display driver 93 accumulates each data from the arithmetic unit 91 in the data register 93a, converts the data into segment data through the segment data conversion unit 93b, and then supplies the segment data to the display unit 95. It is supposed to be displayed.

[0004]

In the above-described display device, when an abnormality occurs in the arithmetic unit 91 due to a disturbance in the one-chip microcomputer or a program runaway, or the display of the weighing data becomes abnormal due to various other causes. However, if the display becomes abnormal like this, there is a problem that it is impossible to carry out a normal charge transaction for electricity, gas, water, and the like.

Specifically, in the case where an abnormal state occurs with respect to a normal display as shown in FIG.
If an abnormal display other than the number is displayed as shown in 0 (b), or if the weighing data is erroneously carried to another digit, it is changed to an abnormal number as shown in FIG. 10 (c). In addition, there is a charge system that changes the charge depending on the season and time for power trading, but in this case there is a built-in clock function to display the time, etc., but if an abnormal state occurs As shown in FIG. 10D, there is a problem that the normal time 12:34 changes to the abnormal time 27:95 and the wrong time is displayed.

The present invention has been made in view of the above,
The purpose is to accurately detect abnormal conditions,
An object of the present invention is to provide a display device with an anomaly detection function that outputs an anomaly detection signal and displays the immediately preceding valid weighing data, and can continue a normal charge transaction.

[0007]

[0008]

[0009]

In order to achieve the above-mentioned object, the present invention according to claim 1 is a display device for displaying weighing data from a computing unit, wherein weighing data from the computing unit is previously measured. compared with the data, and checking means for checking whether the weight value is increasing and whether one same metering value
When the measured value is not the same and the measured value is not increased by one , an abnormality detection signal is output and a control means for controlling to display the previous measured data is provided.

[0010] In the present invention according to claim 1, the weighing data from the arithmetic unit compared to the previous weighing data, checks whether the weight value is increasing and whether one same metering value
If they are not the same and the weight value has not increased by one , that is, they are not the same and have increased by two or more,
It judges that there is an abnormality, outputs an abnormality detection signal, and displays the previous weighing data.

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

Further, the present invention according to claim 2 provides the invention according to claim 1.
In serial mounting of the invention, the abnormality detection signal by the CPU after being reset, read weighing data from the data register, and summarized in that a re-start control means restarting.

According to the second aspect of the present invention, after the CPU is reset by the abnormality detection signal, the measurement data is read from the data register and restarted.

According to the present invention of claim 3 , the chi
The check means is the weighing data and the above when there is no carry.
The weighing data from the calculation unit are compared and both do not match
In case of, the first comparator that outputs a mismatch signal and carry
If there is a measurement data and the measurement data from the calculation unit
Data and compare the two weighing data
The second comparator that outputs the same as the first and second comparators
When the above-mentioned mismatch signal is output,
An AND circuit that takes the logical product and outputs it as an abnormality detection signal
The point is to have and.

In the present invention according to claim 3 , the first ratio
Comparator uses the weighing data and the calculation unit when there is no carry.
If there is a mismatch with the weighing data of, a mismatch signal is output,
The second comparator is used for weighing data when there is a carry.
An inconsistency signal is output when the weighing data from the calculation unit does not match.
The AND circuit from the first and second comparators simultaneously.
When a match signal is output, the logical product of both mismatch signals is calculated.
Output as an abnormality detection signal.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a display device with an abnormality detecting function according to an embodiment of the present invention.
The display device with an abnormality detecting function shown in FIG. 1 includes an arithmetic unit 1 including a one-chip microcomputer 1a, a controller 31 for controlling the operation of each unit, and an input data latch for temporarily storing the measurement data from the arithmetic unit 1. Unit 33, data inspection unit 35 for inspecting abnormality of weighing data, data inspection unit 3
Data register 3 for accumulating the weighing data inspected in 5.
7, and a display driver 3 including a segment data conversion unit 39 for converting the measurement data accumulated in the data register 37 into segment data and outputting the segment data, and a display for displaying the measurement data output from the segment data conversion unit 39. 5 and.

FIG. 2 is a diagram showing a register configuration of the display driver 3. The display driver 3 has four data registers and one control register.

In the display device with an abnormality detecting function constructed as shown in FIG. 1, the computing unit 1 first executes a program by the one-chip microcomputer 1a to compute the usage amount of electricity, gas, water, etc. , Calculate weighing data,
This measurement data is supplied to the display driver 3. In the display driver 3, the weighing data from the calculation unit 1 is temporarily stored in the input data latch unit 33 via the controller 31 and supplied to the data inspection unit 35. Data inspection unit 3
Reference numeral 5 checks the validity of the measurement data supplied from the input data latch unit 33. Then, as a result of this check, when the measured data is determined to be normal, the measured data accumulated in the input data latch unit 33 is transferred to the data register 37, converted into segment data by the segment data conversion unit 39, and displayed. It is supplied to the container 5 and displayed.

Input data latch unit 3 in the above processing
The writing of data into the data register 3, the reading of the data stored in the data register 37, the inspection of the data stored in the input data latch unit 33 by the data inspection unit 35, and the like are supplied from the arithmetic unit 1 to the display driver 3. The address is controlled as shown in FIG. 2, which will be described in more detail with reference to FIGS. 11 and 12.

In FIG. 2 and FIG. 11, address A
2, A1 and A0 indicate the addresses supplied from the arithmetic unit 1 to the display driver 3, but these addresses are 000.
(0) to 100 (= 4), as shown in detail in FIG. 11, in the case where the address is 000 (= 0) and the data is involved in the input data latch unit 33, the input data The value of the data input from the arithmetic unit 1 is written in the 1000s position of the latch unit 33, and the value stored in the 1000s position of the data register 37 is read during the read operation. Similarly, if the address is 00
In the case of 1 (= 1), the 100's place and the address are 010
In the case of (= 2), the tens digit and the address are 011 (=
In the case of 3), the value of 1s is written or read. If an abnormality detection signal is input from another device at the time of writing, the value is destroyed.

When the address is 100 (= 4), the data inspecting section 35 inspects the data stored in the input data latch section 33 by writing an arbitrary value in the write operation. This test result,
(1) When the data is normal, the input data latch unit 3
The data of No. 3 is transferred to the data register 37 and displayed, and (2) when the data is abnormal, an abnormality detection signal is output. However, when the abnormality detection signal is input from another device, the operation (1) described above is not performed. Furthermore, during the read operation, the inspection result of the data stored in the input data latch unit 33 is read. This inspection result is represented by 0 and 1, where 0 indicates that the data is normal, and 1 indicates that the data is abnormal.

Next, the operation at the time of writing data will be described with reference to the flowchart of FIG. In FIG. 12, first, it is checked whether or not it is a data write operation, and if it is data write (step 110), it is checked whether or not there is an abnormality detection signal from another device (step 120). If there is no abnormality detection signal from another device, it is checked whether or not the address input from the arithmetic unit 1 is 0 to 3 (step 130). As described above, the input value is set to 100 in the input data latch unit 33 according to the address value.
The data is stored in the 0s, 100s, 10s, or 1s (step 140).

If the address is not 0 to 3,
It is checked whether the address is 4 (step 15
0), the data stored in the input data latch unit 33 is inspected (step 160). As a result of this inspection, it is checked whether or not the data is normal (step 17
0), if normal, the contents of the input data latch unit 33 are transferred to the data register 37 (step 18
0), the contents of the data register 37 are displayed on the display 5 via the segment data converter 39 (step 19).
0). If the data is not normal, an abnormal status is set and an abnormal detection signal is output (step 2
00).

Referring again to FIG. 1, when abnormal measurement data is input due to the runaway of the operation unit 1 or the like, the data inspection unit 35 outputs an abnormality detection signal to the controller 31 and the outside. Further, by reading the contents of the control register, it is possible to check whether or not there is a data abnormality in the input data latch unit 33. By inputting the abnormality detection signal output to the outside to the reset terminal of the one-chip microcomputer 1a of the arithmetic unit 1, the one-chip microcomputer 1a
To reset the abnormal operation of the one-chip microcomputer 1a. Further, after the recovery, by reading the contents of the data register 37, it is possible to display the correct weighing data before the arithmetic unit 1 runs out of control on the display unit 5.

Next, with reference to FIG. 3 and subsequent figures, each abnormality detecting function in the data inspection section 35 will be described.

FIG. 3 is a block diagram showing the configuration of the decimal number check circuit. The decimal number check circuit shown in the figure is for checking whether or not the weighing data accumulated in the input data latch unit 33 deviates from the range of the decimal number, and the 4-digit weighing from the input data latch unit 33 is performed. It has four comparators 41, 42, 43, 44 for respectively comparing the data with the maximum value "9" in decimal. The measurement data from the input data latch unit 33 is input to the input A of each of these comparators from the first digit to the fourth digit,
It is compared with "9" supplied to the input B of each comparator. When the measurement data from the input data latch unit 33 is larger than “9” (A> B), each comparator outputs an abnormality detection signal, and this abnormality detection signal is output via the OR circuit 45 to the outside. Is output to.

FIG. 4 is a block diagram showing the structure of the carry check circuit. The carry check circuit shown in the figure is for checking whether or not the carry of the weighing data is normally carried out, and the two carry comparators 46, 47, 1
It has one adder 48 and an AND circuit 49. The comparator 46 compares the weighing data when there is no carry with the weighing data from the input data latch unit 33, and the comparator 47 adds 1 to the weighing data of the data register 37 by the adder 48 ( That is, the weighing data when there is a carry) is compared with the weighing data from the input data latch unit 33, and each comparator outputs a non-coincidence signal (A ≠ B) when the compared two metrology data do not match. Then 2
When the non-coincidence signals are simultaneously output from the two comparators 46 and 47, the AND circuit 49 takes the logical product of the non-coincidence signals and outputs them as an abnormality detection signal. This abnormality detection signal is output when the outputs of the two comparators 46 and 47 do not match, that is, when the carry is two or more.

FIG. 5 is a block diagram showing the structure of the checksum checking circuit. The checksum inspection circuit shown in the figure is for checking whether or not the weighing data is normal by calculating the checksum of the weighing data, and calculates the checksum of the weighing data from the input data latch unit 33. It has a checksum calculator 50 and a comparator 51 that compares the checksum output from the checksum calculator 50 with the data of a checksum register newly provided in the input data latch unit 33. And
After writing the weighing data, the arithmetic unit 1 writes a checksum in the control register and starts checking the weighing data. The checksum obtained by inputting the weighing data from the input data latch unit 33 to the checksum calculator 50 and the data in the checksum register are compared by the comparator 51. If they do not match, the abnormality detection signal is output to the outside. To the input data latch unit 33 when they match.
And transfers the measured data of No. to the data register 37.

FIG. 6 is a block diagram of a check circuit for multiple writing. The check circuit shown in the figure is for checking the weighing data by multiple writing, and stores the weighing data previously written by the computing unit 1 in the previous writing data register 52 and the previous writing data register. The comparator 53 includes a comparator 53 for comparing the measured data with the current written measured data output from the input data latch unit 33, and a gate circuit 54 controlled by the output of the comparator.

Since the measurement data from the arithmetic unit 1 is input every time the main routine of the program executed by the one-chip microcomputer 1a is rotated, it is checked whether or not the same measurement data is written twice or more. Only when it is written twice or more, the weighing data is determined to be normal and transferred to the data register 37.

That is, when the weighing data written from the arithmetic unit 1 is first accumulated in the input data latch unit 33 and then a check command is written in the control register, the comparator 53 causes the comparator 53 to write the previous data from the previously written data register. The written weighing data is compared with the currently written weighing data from the input data latch unit 33. When both data match, that is, when the same data is written twice, it is determined that the weighing data is correct, the gate circuit 54 is opened, and the contents of the previously written data register 52 are transferred to the data register 37. If they do not match, the contents of the previous write data register 52 are discarded, and the contents of the input data latch unit 33 are newly transferred to the previous write data register 52.

FIG. 7 is a block diagram showing the configuration of a circuit for performing a normal data restoration operation after the one-chip microcomputer 1a is reset due to an abnormal operation. As described above, the display driver 3 has registers as shown in FIG. 2, and the contents of the data register can be read by reading the register of each digit. That is, as shown in FIG. 7, the input data latch unit 55 and the data register 56 are connected to the inputs A and B of the bidirectional data bus 57, respectively, and the read / write selection signal (R / W) from the outside is used. Input A is selected when reading
The contents of the data register 56 can be read and the input B is selected at the time of writing so that the weighing data can be written to the input data latch unit 55.

After the reset due to the abnormal operation, the weighing data stored in the data register 56 of the display driver 3 is read out and restarted, so that the charge transaction is started from the normal weighing data before the abnormality is detected. It can be continued.

FIG. 8 is a block diagram showing the structure of a check circuit for checking the upper and lower limits of the clock data. As an example, the clock data check circuit shown in FIG.
It checks the clock data of the "minute" position, and has two comparators 58 and 59. Then, the comparator 58 receives "5" at its input B, compares this "5" with the clock data (A) from the input data latch unit 33, and checks the upper limit value. Further, the comparator 59 receives “0” at its input B and inputs this “0” into the input data latch unit 3
The lower limit value is checked by comparing with the clock data (A) from 3.

As a result of this comparison, when A> B in the comparator 58, that is, when it is larger than the upper limit value "5", the comparator 5
If A <B in 9, ie, smaller than the lower limit value “0”, it is determined that the clock data is abnormal, and the OR circuit 60 outputs an abnormality detection signal. By providing a similar circuit for each digit, it is possible to check the case where an abnormal value is written as the clock data.

Further, in the circuit of the display device with an abnormality detection function shown in FIG. 1, when an abnormality detection signal is input from another display device, the display driver 3 stores the data input from the arithmetic unit 1 in the data register 37. It is possible to protect the data of another display driver by controlling so as not to transfer, and when a plurality of display drivers are connected, an abnormality is detected in any one display driver. .

[0043]

[0044]

As described in the foregoing, according to the present invention of claim 1 wherein the metering data from the arithmetic unit compared to the previous weighing data, whether metric value increases and whether one same Checked, the weight values are not the same and the weight value is increased by 1.
If it is not the same, that is, if it is not the same and it is two or more, it is judged as abnormal, an abnormality detection signal is output, and the previous weighing data is displayed. It is possible to detect and continue normal tariff transactions with previous metering data.

[0045]

[0046]

[0047]

Further, according to the present invention of claim 2 , after the CPU is reset by the abnormality detection signal, the weighing data is read from the data register and restarted, so that the normal weighing before the abnormality is detected. Data allows you to continue toll transactions.

According to the present invention of claim 3 , the first comparison
The measuring instrument displays the weighing data when there is no carry and the calculation unit
When the weighing data does not match, a mismatch signal is output and
2 Comparator, weighing data and calculation in case of carry
Outputs an inconsistency signal when the weighing data from the parts do not match
However, the AND circuit is disabled from the first and second comparators at the same time.
When a match signal is output, the logical product of both mismatch signals is calculated.
Output as an abnormality detection signal, abnormal weighing data
Data quickly and use the last valid weighing data to
The gold transaction can be continued.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a display device with an abnormality detection function according to an embodiment of the present invention.

FIG. 2 is a diagram showing a register configuration of a display driver used in the display device with an abnormality detection function shown in FIG.

3 is a block diagram showing a configuration of a decimal number check circuit in a data inspection unit used in the display device with an abnormality detection function shown in FIG.

FIG. 4 is a block diagram showing the configuration of a carry check circuit in the data inspection unit.

FIG. 5 is a block diagram showing a configuration of a checksum inspection circuit in a data inspection unit.

FIG. 6 is a block diagram of a check circuit by multiple writing in a data inspection unit.

FIG. 7 is a block diagram showing a configuration of a circuit for performing a restoring operation of normal data after a reset of the one-chip microcomputer due to an abnormal operation.

FIG. 8 is a block diagram showing a configuration of a check circuit for checking upper and lower limits of clock data.

FIG. 9 is a block diagram showing a circuit configuration of a conventional display device.

FIG. 10 is a diagram illustrating an abnormal state of data in a conventional display device.

FIG. 11 is a diagram showing the function of the register configuration shown in FIG. 2 in more detail.

FIG. 12 is a flowchart showing an operation at the time of writing data in the functions shown in FIGS. 2 and 11.

[Explanation of symbols]

1 computing unit 1a One-chip microcomputer 3 Display driver 5 Display 31 Controller 33 Input data latch section 35 Data Inspection Department 37 Data register 39 segment data converter

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinpei Kimura 70 Yanagimachi, Saiwai-ku, Kawasaki City, Kanagawa Prefecture Yanagimachi Plant, Toshiba Corporation (56) Reference JP-A-1-228030 (JP, A) JPA 60-210768 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01D G01F G06F 3/14 320

Claims (3)

(57) [Claims] 1. A display device for displaying the weighing data from the arithmetic unit, the weighing data from the arithmetic unit compared to the previous weighing data, it is checked whether the weighing value increases and whether one same The check means and the measured value are not the same and
A display device with an abnormality detection function, comprising: a control unit that outputs an abnormality detection signal and controls to display the previous measurement data when the measured value does not increase by one . 2. The display device with an abnormality detection function according to claim 1, further comprising a restart control means for reading the measurement data from the data register and restarting the CPU after the CPU is reset by the abnormality detection signal. . 3. The first comparator, which compares the weighing data when there is no carry and the weighing data from the arithmetic unit, and outputs a mismatch signal when both weighing data do not match, and a carry. A second comparator that compares the weighing data when there is a difference with the weighing data from the arithmetic unit, and outputs a mismatch signal when both weighing data do not match;
And an AND circuit which, when the non-matching signals are simultaneously output from the second comparator, calculates a logical product of the two non-matching signals and outputs the result as an abnormality detection signal. Display device with anomaly detection function.