JPH0756627A - Signal input method - Google Patents

Abstract

PURPOSE:To surely detect the faults, to reduce the influence to a control operation, and to improve reliability of the device. CONSTITUTION:The signal groups 11 and 12 having a prescribed relation among signals are sent to a control part 30 via an input part 20 and then transmitted via an output part 40. A fault detecting part 50 detects a fault when a prescribed relation is not secured among the signals of the same signal group. The input signals 11a, 11b and 12a, 12b of both groups 11 and 12 are distributed and inputted to the different input circuit groups 21a and 22b respectively. If one of both groups 21a and 22b has a fault, only one of both signals belonging to the same input signal group becomes abnormal. Thus the part 50 can detect a fault. Furthermore the influence can be reduced to the part 30 owing to a fact that only one of both signals of the same group becomes abnormal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal input method for improving the reliability of a signal processing circuit in a control device or the like, and more particularly, the present invention relates to a plurality of groups of signal groups having a predetermined relationship between signals. The present invention relates to a signal input method capable of improving the reliability when the signal of (1) is input to a control device or the like via a plurality of input circuits.

[0002]

2. Description of the Related Art A control device normally receives an external signal and converts it to an appropriate level, a control section for calculating and judging the signal from the input circuit, and a signal for the next control device. In many cases, it is composed of an output unit for sending out.
FIG. 3 is a diagram showing the most basic configuration of the above-mentioned control device. In FIG. 3, 11a, 11b, 12a, 12b are shown.
Is an input signal given from the outside, 20 is its input section, and the input section 20 is the input signal 11a, 11b, 12
input circuits 21a and 21 to which a and 12b are respectively applied
b, 22a, 22b.

The input signals are the input signals 11a and 11b,
Input signals 12a and 12b are divided into two groups, and an input circuit group 21 including input circuits 21a and 21b, respectively, corresponding to each group.
Input circuit group 22 including input circuits 22a and 22b
And are provided. Reference numeral 30 denotes a control unit that performs an arithmetic operation on the input signals 11a, 11b, 12a, and 12b given through the input unit 20 and makes a decision on the input signal, and 40 an output that outputs a processing result in the control unit 30. It is a department.

Further, reference numeral 50 is a failure detection section, and the failure detection section 50 is provided with failure detection circuits 51 and 52 corresponding to the above-mentioned input circuit groups 21 and 22. The failure detection section 50 is controlled by the control section 30. In addition to detecting an abnormality in the operation of the input unit 20 and the output unit 40, the signal output from the input unit 20 is monitored to detect an abnormality in the input unit 20. In FIG. 3, the input signal 11
a, 11b, 12a, 12b are input circuits 21a, 21
In b, 22a, and 22b, the levels and forms required by the control unit 30 are converted and sent to the control unit 30. Control unit 3
0 performs calculation and judgment necessary for control on the input signal, and sends the resulting signal to the output unit 40. Output unit 40
Converts the signal output by the control unit 30 into a signal in a form convenient for signal transmission and the next control device and sends it out.

On the other hand, the failure detecting section 50 detects an abnormal operation of the control section 30 and the output section 40 as described above, and also detects an abnormal operation of the input section 20. When a failure occurs, a failure detection output is output. The information is sent to the control unit 30 and the output unit 40, and measures such as stopping the device and issuing an alarm are taken in order to minimize a ripple accident due to a failure that has occurred. In addition, in FIG.
An example with four input signals is shown, but when there are many input signals, an input circuit is required for each input signal,
Accordingly, the failure detection unit 50 also needs a failure detection circuit corresponding to each input signal.

As a method of detecting an abnormality in the input signal in the failure detection circuit 50, for example, the input signal is monitored, and the input signal has a value that occurs when an abnormality occurs in the device or an abnormal change. Or a method of detecting an abnormal operation of the input side device or the input unit 20 by detecting an unrealistic value or a theoretically impossible value can be used. .

In the case of FIG. 3, a plurality of input signals are divided into some groups, and when there is some regularity between the signals in the group and the regularity is impaired, The case where it is determined that an abnormality has occurred is shown. That is, the four input signals are the input signals 11a,
An input signal group consisting of 11b and input signals 12a,
The input signals are divided into input signal groups 12b, and when the device is normal, there is a certain regularity between the input signals 11a and 11b and between the input signals 12a and 12b. The regularity is, for example, a case where the sum or difference of two signals is zero, a constant value, or a sum of squares is a constant value.

In response to the input signal as described above, the input section 20 has the input circuit group 21 composed of the input circuits 21a and 21b and the input circuits 22a and 2a, 2 as described above.
An input circuit group 22 composed of 2b is provided,
Further, the failure detection unit 50 is also provided with failure detection circuits 51 and 52 corresponding to the respective input circuit groups, and the failure detection circuits 51 and 52 are impaired in the regularity between the two signals in each signal group. I am watching for the absence.

When the regularity is disturbed, it is judged that the device or the input circuit is abnormal, and a failure signal is sent to the control circuit 30 and the output section 40.

[0010]

In the case of FIG. 3, the failure occurring in the device, the circuit or the component is detected as described above, but this method cannot detect 100%. . That is, in FIG. 3, when only one of the input circuits 21a, 21b, 22a, 22b fails, the regularity between the two signals is disturbed as described above, so that an abnormality in the circuit or the like can be easily detected. However, when two input circuits belonging to one input circuit group, the input circuits 21a and 21b, or the input circuits 22a and 22b fail at the same time, an abnormality may not be detected depending on the type of regularity to be detected. Occurs.

For example, when the sum of the two signals is zero, which is the regularity between the two input signals, two input circuits belonging to the same input circuit group simultaneously fail,
When the outputs of both input circuits are lost (that is, when the outputs become zero), the relationship in which the sum of the two signals is zero is still maintained, and the above method cannot detect the abnormality.

Generally, when a plurality of input circuits are provided, several integrated circuits in which a plurality of circuits are put in one package are used, or several printed wiring boards incorporating a plurality of circuits are used. In this case, it is often the case that one integrated circuit or printed wiring board is provided corresponding to each of the input circuit groups. In addition, the control power supply is often divided for each input circuit group.

In the example of FIG. 3, each of the input circuit group 21 and the input circuit group 22 is composed of one integrated circuit or a printed wiring board, or the power supply is divided correspondingly. In such a case, a failure of one integrated circuit or a printed wiring board results in the loss of signals of one input circuit group, and even if a failure occurs in the input circuit, it belongs to the same group as described above. In some cases, the regularity between input signals is maintained and a failure cannot be detected.

The present invention has been made in view of the above-mentioned problems of the prior art, in which individual signals constituting an input signal in which a certain regularity is maintained between the signals are simultaneously failed. Even if the input circuit group consisting of a single integrated circuit or printed wiring board fails, the failure can be reliably detected and the control operation can be performed by distributing it to multiple difficult input circuit groups. It is an object of the present invention to provide a signal input method in which the influence on the signal is reduced and the reliability of the device is improved.

[0015]

In order to solve the above problems, the present invention provides a plurality of signal groups having a regularity among signals in a plurality of circuit groups including a plurality of input circuits for subjecting an input signal to predetermined processing. In the signal input method of inputting the signals of the signal group consisting of, and processing the individual signals of the signal group having the regularity between the signals by the individual input circuits of the circuit group, the signals belonging to the same signal group are , Input is distributed to a plurality of circuit groups.

[0016]

In the present invention, the signals belonging to the same signal group are distributed and input to the circuits of a plurality of circuit groups. Therefore, if one input circuit group fails, it belongs to the same signal group. Of the signals, only the signal input to the failed input circuit group becomes abnormal, and does not affect other signals.

Therefore, when the failure is detected by utilizing the fact that the signals of the same signal group have a predetermined relationship, the failure can be surely detected, and the control using the output of the input circuit group is possible. The influence on the operation can be reduced.

[0018]

FIG. 1 is a diagram showing an embodiment of the present invention, in which the same components as those shown in FIG. 3 are designated by the same reference numerals, and in the present embodiment, input signals 11a, 11b,
12a, 12b and input circuits 21a, 21b, 22a, 2
Connection relationship with 2b, input circuits 21a, 21b, 22a,
The connection relationship between 22b and the failure detection circuits 51 and 52 is different from that in FIG.

That is, the input signals 11a and 11 of the first input signal group 11 in which a certain regularity is maintained between the signals
Among b, the input signal 11a is connected to the input circuit 21a of the input circuit group 21, and the input signal 11b is connected to the input circuit 22a of the input circuit group 22. In addition, the second input signal group 12 in which a certain regularity is maintained between the signals
The input signal 12a of a and 12b is the input circuit group 2
1 is connected to the input circuit 21b, and the input signal 12b is connected to the input circuit 22b of the input circuit group 22.

Similarly, the outputs of the input circuits 21a and 22a to which the input signals 11a and 11b belonging to the first input signal group are input are connected to the failure detection circuit 51 and belong to the second input signal group. Input signal 1
Input circuit 21b to which 2a and 12b are respectively input
The outputs of and 22b are connected to the failure detection circuit 52. That is, two input signals belonging to one input signal group in which a certain regularity is maintained between the signals are dispersed and input to different input circuit groups.

With the above configuration, when one of the input circuit groups fails, one of the two signals belonging to one input signal group loses one input signal connected to the failed input circuit group side. Since it becomes zero or changes and becomes a value different from the normal value, the regularity with the other normal signal is lost. Therefore, the failure detection unit 50 can detect this loss of regularity and determine that there is a failure.

FIG. 2 is a diagram showing a more specific embodiment of the present invention, and this embodiment shows a three-phase voltage and three-phase current detection circuit. In the figure, reference numeral 100 denotes an input signal, and the input signal 100 is composed of a first group of input signals 15 consisting of input signals 15a, 15b, 15c corresponding to three phases, and input signals 16a, 16b, 16c. Second group of input signals 16 consisting of input signals 17a, 17
It comprises a third group 17 of input signals consisting of b, 17c.

Reference numeral 200 denotes an input section, which is used for input circuits 25a,
Input circuit group 25 composed of 25b and 25c, and input circuit group 2 composed of input circuits 26a, 26b and 26c
6, an input circuit group 27 including input circuits 27a, 27b, and 27c. Reference numeral 300 denotes an input signal given via the input section 200,
A control unit 400 that makes a determination on the input signal, and an output unit 400 that outputs the processing result of the control unit 300.

Reference numeral 500 is a failure detection unit, and the failure detection unit 5
00 is composed of failure detection circuits 55, 56 and 57.
The operation of the embodiment shown in FIG. 2 will be described below. As the input signals 15a, 15b, 15c of the input signal group 15, R
A set of three-phase voltages of (U) phase, S (V) phase, and T (W) phase is applied.

Of the three signals of the three-phase voltage of the input signal group 15, the first input signal 15a is the input circuit group 2
5 input circuit 25a and second input signal 15b are input circuit 26a of input circuit group 26 and third input signal 15c.
Are sent to the control unit 300 via the input circuits 27a of the input circuit group 27, respectively. In addition, the input circuit 25
a, the output of the input circuit 26a, and the input circuit 2
The output of 7a is given to the failure detection circuit 55 of the failure detection unit 500, and the failure detection circuit 55 monitors the signals of the input signal group 15. Then, when it is detected that an abnormality has occurred, as described above, the control unit 300 and the output unit 400.
The failure detection will be sent to, and measures will be taken to stop the equipment and issue an alarm in order to minimize the ripple accidents caused by the failure that occurred.

Similarly to the above, the input signals of the input signal groups 16 and 17 are also supplied to the control unit 300 and the output unit 400 via the input unit 200 and to the failure detection unit 500 for each input signal group. To be monitored. By the way, there are regularities in the three voltages and current values that make up the three-phase voltage and the three-phase current. For example, for the three-phase voltage, the sum of the three line voltages of the three phases is zero, and usually three. The two phase voltages are close to each other. Therefore, the fact that the sum of the three voltages is not zero or that the three phase voltages have significant variations indicates that there is an abnormality in the device or the input circuit that supplies the input signal.

Further, the sum of the values of the three currents forming the three-phase current is usually zero, and the fact that the sum of the three currents is not zero means that the zero-phase current is flowing, and further that the ground current is It indicates that the signal is flowing or the like, and indicates that the operation of the device that supplies the input signal or the device is abnormal, or that the operation of the input circuit is abnormal. That is, the sum of the three current values does not become zero in any of the case of the apparatus, the abnormal operation of the apparatus, and the failure of the input circuit.

As described above, the fault detecting section 500 can detect the abnormality of the device or the abnormality of the input circuit by monitoring the sum of the three signals of the input signal group. Here, in the present embodiment, an input signal group 15, which is a group of input signals in which a certain regularity is maintained between the signals,
The respective signals of 16 and 17 are given to the control unit 300 and the failure detection unit 500 via different input circuit groups 25, 26 and 27.

Therefore, the input circuit groups 25 and 2
Even if one input circuit group out of 6,27 fails,
Only one of the three signals forming the three-phase voltage or the three-phase current becomes abnormal, and all signals do not become zero or have the same value. Therefore, when one input circuit group fails, the failure detection circuits 55, 5
The signal input to 6 or 57 is a combination of two normal signals and one abnormal signal, and the regularity described above is lost, and the failure detection unit 500 reliably detects an abnormality in the input circuit. be able to.

Further, in the above case, the signals supplied to the control unit 300 are a combination of two normal signals and one abnormal signal, and all the signals belonging to the same input signal group do not become abnormal. Therefore, the influence on the control unit 300 is small, and it may be possible to continue the operation as it is, depending on the configuration of the control unit. In the present embodiment, since the configuration is as described above, the failure detection circuit can detect the abnormality of the input circuit unless the abnormality occurs in all the input circuit groups at the same time, and the reliability of the control device etc. Can be improved.

In the above embodiment, an example in which three-phase voltage and current are input as the input signal has been shown, but the number and form of the input signal in the present invention does not matter, and the present invention is not limited to this. The point is that multiple signals having mutual correlation and regularity should be treated as one group, and the individual signals forming the group should be simultaneously input to a plurality of circuits in which failure is unlikely to occur. Various modifications can be made within the range.

[0032]

As described above, in the present invention, signals belonging to the same signal group are distributed and input to the circuits of a plurality of circuit groups. The reliability of the device can be dramatically improved by simply changing the signal path without increasing the number.

Further, when a failure occurs in one input circuit group, only the signal input to the failed input circuit group in the input signal group becomes an abnormal signal, and the other signals. Is maintained normally, it is possible to suppress the degree of disturbance even when a signal of the above group is input to the control unit in the subsequent stage.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a specific example of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional control device which is a premise of the present invention.

[Explanation of symbols]

10 100 input signal 11, 12, 15, 16, 17 input signal group 11a, 11b, 12a, 12b, 15a, 15b, 1
5c, 16a, 16b, 16c, 17a, 17b, 17
c Input signal 20,200 Input section 21,22,25,26,27 Input circuit group 21a, 21b, 22a, 22b, 25a, 25b, 2
5c, 26a, 26b, 26c, 27a, 27b, 27
c input circuit 30,300 control unit 40,400 output unit 50,500 failure detection unit 51, 52, 55, 56, 57 failure detection circuit

Claims (1)

[Claims] 1. A signal of a signal group composed of a plurality of signals having regularity between the signals is input to a plurality of circuit groups composed of a plurality of input circuits for subjecting the input signal to predetermined processing, and each of the circuit groups In the signal input method for processing individual signals of a signal group having regularity between the signals, the signals belonging to the same signal group are dispersedly input to a plurality of circuit groups. How to input signals.