JP2008131091A - Status information communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a status information communication system capable of flexibly dealing with a case where a user does not want to determine that a self-diagnosis device is in an abnormal state on the basis of only a temporary change in a clock signal for generating status information in determining whether the self-diagnosis device is normal or abnormal. <P>SOLUTION: The system includes a status information generating circuit provided on the self-diagnosis device for diagnosing its own apparatus and capable of outputting a clock signal as status information used as a result of self diagnosis of its own apparatus in a normal state and stopping the clock signal in an abnormal state; a transformer for transforming a clock signal of the status information generating circuit into a sine wave and outputting the transformed signal; a rectifying circuit for rectifying the sine wave from the transformer; a comparator for comparing a predetermined threshold value with the output of the rectifying circuit; and a status information receiving circuit which is provided on the diagnosis information receiving device for receiving a signal based on the status information and receiving an input from the comparator and is available to recognize whether the self diagnosis device is in a normal or abnormal state. The system having this configuration determines whether the self diagnosis device is in a normal or abnormal state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a status information communication system in which a self-diagnosis device generates status information that is a result of self-diagnosis, and a diagnostic information receiver that receives this information determines whether the self-diagnosis device is normal or abnormal.

  The simplest method for communicating status information, which is the result of failure diagnosis of the self-diagnostic device, is that the status information generation circuit that outputs status information is normal high, abnormal low (or normal low, abnormal high). The method of outputting the said fixed value is mentioned. However, in this method, when the status information generation circuit fails, the status information generation circuit erroneously outputs "the self-diagnosis device is normal" even though the self-diagnosis device itself is abnormal. As a result, there is a danger that the status information receiving circuit of the diagnostic information receiving apparatus recognizes that “the self-diagnosis apparatus is normal”.

  In order to solve this problem, in order to monitor whether the self-diagnosis device is normal or abnormal, a self-diagnostic device outputs a clock signal (high / low repetitive signal, that is, status information clock signal) when the self-diagnosis device is normal. An apparatus for determining whether the self-diagnosis apparatus is normal or abnormal from the frequency of this signal is disclosed in Patent Document 1.

  FIG. 7 is a block diagram showing a conventional status information communication system. A status information clock signal is input from the status information generation circuit 3 present in the self-diagnosis device 1 to the status information reception circuit 4 of the diagnosis information reception device 2, and the self-diagnosis device 1 is normal based on the frequency of this signal. Or abnormal. On the other hand, FIG. 8 is a block diagram showing another conventional status information communication system. In FIG. 2, the status information clock signal is converted into a sine wave by the transformer 5. This sine wave is converted into a direct current by the full wave rectifier circuit 6 and input to the monitoring relay 7. The monitoring relay 7 is turned ON / OFF depending on whether it is normal or abnormal, and the status information receiving circuit 4 determines whether the self-diagnosis device 1 is normal or abnormal.

JP 2000-68805 A (paragraph [0012])

  However, in these methods, even if the frequency changes temporarily, it is considered that the self-diagnosis device is always regarded as abnormal. Furthermore, a device that rectifies the periodic signal output when the diagnostic information receiving device is normal and inputs it to the primary side of the monitoring relay is also proposed at the same time, but since the monitoring relay is adopted, the mounting area is small In some cases, practical use was difficult. In addition, since the relay has a limit on the number of ON / OFF switching, there is a problem that the warranty years are limited when the switching between normal and abnormal is severe.

  The present invention has been made to solve the above-described problems, and when determining whether the self-diagnosis device is normal or abnormal, the self-diagnostic device is not self-existing if the status information generating clock signal is temporarily changed. The purpose is to be able to flexibly cope with the case where it is not desired to judge that the diagnostic device is abnormal. Also, when the status information generation clock signal is rectified and input to the status information receiving circuit, it is not necessary to employ a monitoring relay as in Patent Document 1, so that there is room for the board mounting area. It aims to be able to.

  A status information communication system according to the present invention is provided in a self-diagnosis device that performs self-diagnosis, and outputs a clock signal when it is normal and stops the clock signal when it is abnormal as status information that is a result of self-diagnosis. An information generating circuit; a transformer for converting the clock signal of the status information generating circuit into a sine wave and outputting; a rectifying circuit for rectifying the sine wave output from the transformer; a preset threshold value; and an output of the rectifying circuit; And a status information receiving circuit that is provided in a diagnostic information receiving device that receives a signal based on the status information, and that receives the output of the comparator and recognizes whether the self-diagnostic device is normal or abnormal And determining whether the self-diagnosis device is normal or abnormal.

  In addition, the status information communication system according to the present invention is provided in a self-diagnosis device for self-diagnosis, and outputs a clock signal when normal as status information as a result of self-diagnosis and stops the clock signal when abnormal A status information generating circuit for converting the clock signal of the status information generating circuit into a sine wave and outputting the sine wave, a rectifying circuit for rectifying the sine wave output from the transformer, a first threshold value set in advance, and the rectification A first comparator for comparing the output of the circuit, a second comparator for comparing the output of the rectifier circuit with a second threshold smaller than the preset first threshold, and a diagnosis for receiving a signal based on the status information 1st status information which is provided in the information receiving device and recognizes whether the output of the first comparator is inputted and the self-diagnosis device is normal or abnormal A second status information receiving unit that is provided in a diagnostic circuit and a diagnostic information receiving device that receives a signal based on the status information, and that receives the output of the second comparator and recognizes whether the self-diagnosis device is normal or abnormal And a determination threshold value which is different depending on whether the self-diagnosis device is normal or abnormal.

  According to the status information communication system of the present invention, it comprises a comparator that compares a preset threshold value and the output of the rectifier circuit, and the output of the comparator determines whether the self-diagnosis device is normal or abnormal. When the frequency of the status information generation clock signal changes temporarily, for example, when an instantaneous abnormality is detected or an instantaneous status information abnormality occurs, the designer determines whether the self-diagnosis device is normal or abnormal. The threshold value can be set. Further, when the status information generating clock signal is rectified and input to the status information receiving circuit, it is not necessary to employ a monitoring relay, so that a margin can be made in the mounting area of the board.

  In addition, according to the status information communication system of the present invention, different judgment threshold values are set for whether the self-diagnosis device is normal or abnormal. Whether it is in the stable region can also be determined.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a status information communication system according to Embodiment 1 of the present invention. As a usage example of the status information communication system, for example, a controller having a first controller (controlling a target device) and a second controller (standby) as a controller that controls a target device, When the controller (self-diagnosis device) fails (occurs abnormally), the second controller (diagnosis information receiving device) receives this and immediately controls the target device with the second controller instead of the first controller. Used when.

  In FIG. 1, the self-diagnosis device 1 performs its own fault diagnosis and generates status information (normal or abnormal information) as a result of the fault diagnosis from the status information generation circuit 3. When the self-diagnosis device 1 is normal, a clock signal (high / low repetition) is generated as status information, and when abnormal, the clock signal is stopped. A clock signal, which is status information of the status information generation circuit 3, is input to the transformer 5, and a signal converted into a sine wave is output from the transformer 5.

  The output from the transformer 5 is input to the full-wave rectifier circuit 6 and rectified. Next, the output of the full wave rectifier circuit 6 is compared with a preset threshold value, that is, a comparator (comparator) 8, and the magnitude (High / Low) of the output of the full wave rectifier circuit 6 with respect to the threshold value is output. The The output of the comparator 8 (High when normal, Low when abnormal) is input to the status information receiving circuit 4, and the diagnostic information receiving device 2 determines whether the self-diagnosis device 1 is normal or abnormal.

  Here, by setting the reference voltage 9 (preset threshold value) input to the comparator 8 high, an instantaneous stop on the primary side of the transformer 5 can be detected. If it is not desired to detect abnormality of the self-diagnosis device 1 only when the input on the primary side of the transformer 5 is somewhat disturbed, the reference voltage 9 is set low to detect sensitive abnormality of the self-diagnosis device 1. It becomes possible to suppress. In this way, the criterion for normality and abnormality can be set to a desired value using a preset threshold value.

  In FIG. 1, a status information generation circuit 3 and a transformer 5 are provided in the self-diagnosis device 1, and a full-wave rectifier circuit 6, a comparator 8, and a status information reception circuit 4 are provided in the diagnosis information reception device 2. However, a status information generation circuit 3 is provided in the self-diagnosis device 1, and a status information reception circuit 4 is provided in the diagnosis information reception device 2, but from the transformer 5 to the comparator 8 through the full-wave rectification circuit 6. May be provided in the self-diagnosis device 1, the diagnosis information reception device 2, or in the middle thereof. The full-wave rectifier circuit 6 may be replaced with a half-wave rectifier circuit and a capacitor.

Embodiment 2. FIG.
FIG. 2 is a block diagram showing a status information communication system according to the second embodiment. In each figure of each embodiment, the same numerals indicate the same or corresponding parts. In the first embodiment, when changing the threshold value for determining whether the self-diagnosis device 1 is normal or abnormal, it is necessary to change the mounted components. However, in order to change these, it is difficult not only to satisfy the functional aspects but also to select parts having the same pin assignment (pin assignment). Therefore, a variable resistor (volume resistor) 10 and a resistor 11 are connected between the reference voltage 9 end and the ground end 31, and the divided value is added to the threshold value input end of the comparator 8. That is, a variable resistor is connected to the threshold value input terminal of the comparator 8 so that the threshold value can be varied.

  As a result, the threshold value input to the comparator 8 changes only by adjusting the variable resistor 10, so that the threshold setting for determining whether the self-diagnosis device is normal or abnormal can be easily changed. In FIG. 2, the variable resistor 10 is mounted between the reference voltage 9 and the threshold input terminal of the comparator 8, and the resistor 11 is mounted on the threshold input terminal and the ground terminal 31 side of the comparator 8. A similar effect can be expected by mounting the resistor 11 between the threshold input terminals of the comparator 8 and mounting the variable resistor 10 on the threshold input terminal of the comparator 8 and the ground terminal 31 side.

Embodiment 3
FIG. 3 is a block diagram showing a status information communication system according to the third embodiment. In the second embodiment, the threshold value for determining whether the self-diagnosis device 1 is normal or abnormal can be changed by using the variable resistor 10 and the resistor 11 connected to the threshold value input terminal of the comparator 8. In contrast, in the third embodiment, as shown in FIG. 3, the voltage output from the full-wave rectifier circuit 6 is converted into a digital value using the A / D converter 12. Furthermore, a threshold value setting register 13 is provided which uses a threshold value set in advance from the system S / W (software) as a digital value. Then, the digital value of the A / D converter 12 and the digital value of the threshold setting register 13 are input to the digital comparator 14 for comparison. In this way, the threshold setting for determining whether the self-diagnosis device 1 is normal or abnormal can be changed by simply rewriting the S / W of the threshold setting register 13, so that it can be changed by H / W (hardware) for each product. Some variable resistance adjustment is not necessary.

Embodiment 4
FIG. 4 is a block diagram showing a status information communication system according to the fourth embodiment. FIG. 5 is a diagram for explaining the operation of the apparatus of FIG. In the fourth embodiment, the third embodiment is applied to make it easy to find the reason for a failure when a failure (abnormality) occurs. In the fourth embodiment, there are two thresholds for determining whether the self-diagnosis device 1 is normal or abnormal. The voltage value after rectification of the full-wave rectifier circuit 6 becomes a predetermined value by rectification based on the clock signal if the self-diagnosis device 1 is normal, and becomes zero if the self-diagnosis device 1 is abnormal. When a momentary interruption or the like occurs, the clock signal normally output by the self-diagnosis device 1 may be momentarily interrupted or the clock signal may be interrupted, resulting in a smaller value than the predetermined value.

  4 and 5, the first threshold value setting register 13 is set with a digital value that becomes the first threshold value. The A / D converter 12 converts the output of the full wave rectifier circuit 6 into a digital value. The digital value of the A / D converter 12 is compared with the digital value serving as the first threshold by the first digital comparator 14, and the digital value of the A / D converter 12 is compared with the digital value serving as the first threshold. When the value is large, high is output from the first digital comparator 14 and the fact that the self-diagnosis device 1 is normal (absolute safety region) is input to the first status information receiving circuit 4. Conversely, when the digital value of the A / D converter 12 is smaller than the digital value serving as the first threshold value, Low is output from the first digital comparator 14 and the self-diagnosis device 1 is abnormal (in the unstable region). An abnormal region) is input to the first status information receiving circuit 4.

  The second threshold value setting register 15 is set with a digital value that becomes a second threshold value (see FIG. 5) smaller than the first threshold value. The second digital comparator 16 compares the digital value of the A / D converter 12 with the digital value serving as the second threshold, and the digital value of the A / D converter 12 with respect to the digital value serving as the second threshold. When the value is large, high is output from the second digital comparator 16, and the fact that the self-diagnosis device 1 is normal (absolute safety region or unstable region) is input to the second status information receiving circuit 41. Conversely, when the digital value of the A / D converter 12 is smaller than the digital value serving as the second threshold value, Low is output from the second digital comparator 16 and the self-diagnosis device 1 is abnormal (abnormal region). It is input to the second status information receiving circuit 41.

  FIG. 5 is a diagram illustrating the (signal) voltage value after rectification of the full-wave rectifier circuit 6 and the first threshold value and the second threshold value for determining whether the self-diagnosis device is normal or abnormal. The horizontal axis represents time. The first threshold is an absolute safe area where the voltage value after rectification is equal to or higher than the threshold and the self-diagnosis apparatus 1 is operating normally, and an unstable area (data storage area) where an abnormality may occur below the threshold. The boundary line is shown. The second threshold indicates a boundary line between an unstable region (data storage region) in which abnormality may occur when the voltage value after rectification is equal to or higher than the threshold and an abnormal region in which the self-diagnosis device 1 is abnormal when the voltage value is equal to or lower than the threshold. .

  When the voltage value after rectification is in the absolute safety region where the voltage value is equal to or greater than the first threshold, the first status information receiving circuit 4 determines that the self-diagnosis device 1 is normal based on the output of the first digital comparator 14. In the abnormal region where the rectified voltage value is equal to or less than the second threshold, the second status information receiving circuit 41 determines that the second status information receiving circuit 41 is abnormal based on the output of the second digital comparator 16. On the other hand, when the voltage value after rectification is in an unstable region between the first threshold value and the second threshold value, the output of the second digital comparator 16 is indicated as normal, so the self-diagnosis device 1 Although it is not determined to be abnormal, the digital comparator 14 is output abnormally.

  Therefore, when the first digital comparator 14 is an abnormal output and the second digital comparator 16 is a normal output, when and how much, if a mechanism for raising an interrupt to the S / W of the diagnostic information receiving device 2 is provided. Whether the frequency is below the first threshold and above the second threshold (unstable state) can be stored by the diagnostic information receiving apparatus 2. This stored information can be used to predict the occurrence of a failure and to analyze when a failure occurs.

  In the above description, the case where the first digital comparator 14 is abnormal output and the second digital comparator 16 is normal output is stored. However, when the first digital comparator 14 is abnormal output, the second digital comparator 14 is stored. Regardless of the output of the comparator 16, it can also be saved. That is, it is possible to store both data of the unstable region and the abnormal region, and use the stored information to predict the occurrence of a failure and to analyze when a failure occurs. FIG. 4 shows the case where the third embodiment in which the threshold value is set as a digital value is applied. However, the self-diagnosis apparatus 1 is normal by applying the first embodiment in which the threshold value is set as a reference voltage as an analog value. There may be two thresholds for determining whether or not there is an abnormality.

Embodiment 5
6 is a block diagram showing a status information communication system according to the fifth embodiment. Since the system from the first embodiment to the fourth embodiment is a system used in unification, when a large noise occurs between the status information generating circuit 3 and the status information receiving circuit 4, or when there is a disconnection In some cases, it may be impossible to accurately determine whether the self-diagnosis device 1 is normal or abnormal. Therefore, in FIG. 6, a transformer a17, a transformer b18, a full-wave rectifier circuit a19, a full-wave rectifier circuit b20, a reference voltage a21, a reference voltage b22, a comparator a23, and a comparator b24 are prepared. By duplicating the comparator up to the comparator, even if one does not function, the other can determine whether the self-diagnosis device 1 is normal or abnormal.

  In FIG. 6, the transformer from Embodiment 1 to the comparator through the rectifier circuit is duplicated. Similarly, in the second embodiment, the third embodiment, and the fourth embodiment as well, by duplicating the transformer, the rectifier circuit, and the comparator, even if one of the functions does not function, the self-diagnosis device 1 can be operated by the other. Can determine whether normal or abnormal.

It is a block diagram which shows the status information communication system by Embodiment 1 of this invention. 6 is a block diagram showing a status information communication system according to Embodiment 2. FIG. FIG. 10 is a block diagram showing a status information communication system according to a third embodiment. FIG. 10 is a block diagram showing a status information communication system according to a fourth embodiment. It is a figure which shows the 1st threshold value and 2nd threshold value for determining whether the voltage value after a rectification and a self-diagnosis apparatus are normal or abnormal. FIG. 10 is a block diagram showing a status information communication system according to a fifth embodiment. It is a block diagram which shows the conventional status information communication system. It is a block diagram which shows the other conventional status information communication system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Self-diagnosis apparatus 2 Diagnostic information receiver 3 Status information generator 4 Status information receiver 5 Transformer 6 Full wave rectifier 8 Comparator 9 Reference voltage 10 Variable resistor 11 Resistor 12 A / D converter 13 Threshold setting register 14 Digital comparison 15 Second threshold setting register 16 Second digital comparator 17 Transformer a
18 transformer b 19 full-wave rectifier circuit a

20 Full-wave rectifier circuit b 21 Reference voltage a
22 Reference voltage b 23 Comparator a
24 comparator b 31 ground terminal 41 second status information receiving circuit

Claims (5)

A status information generating circuit that is provided in a self-diagnosis device that performs self-failure diagnosis, outputs a clock signal when normal, and stops the clock signal when abnormal, as status information that is a self-diagnosis result;
A transformer that converts the clock signal of the status information generation circuit into a sine wave and outputs the sine wave;
A rectifying circuit for rectifying a sine wave output from the transformer;
A comparator that compares a preset threshold and the output of the rectifier circuit;
Provided in a diagnostic information receiving device that receives a signal based on the status information, and includes a status information receiving circuit that receives the output of the comparator and recognizes whether the self-diagnosis device is normal or abnormal,
A status information communication system for determining whether the self-diagnosis device is normal or abnormal.   2. The status information communication system according to claim 1, wherein a variable resistor is connected to a threshold value input terminal of the comparator so that the threshold value can be varied. An A / D converter that A / D-converts the output of the rectifier circuit and inputs it to the comparator;
The status information communication system according to claim 1, further comprising a threshold setting register that inputs the threshold as a digital value to the comparator. A status information generating circuit that is provided in a self-diagnosis device that performs self-failure diagnosis, outputs a clock signal when normal, and stops the clock signal when abnormal, as status information that is a self-diagnosis result;
A transformer that converts the clock signal of the status information generation circuit into a sine wave and outputs the sine wave;
A rectifying circuit for rectifying a sine wave output from the transformer;
A first comparator for comparing a preset first threshold value with the output of the rectifier circuit;
Provided in a second comparator for comparing a second threshold value smaller than the preset first threshold value and the output of the rectifier circuit, and in a diagnostic information receiving device for receiving a signal based on the status information, the output of the first comparator And a first status information receiving circuit for recognizing whether the self-diagnosis device is normal or abnormal,
A diagnostic information receiving device that receives a signal based on the status information; and a second status information receiving circuit that receives an output of the second comparator and recognizes whether the self-diagnosis device is normal or abnormal. ,
A status information communication system in which different determination threshold values are set for whether the self-diagnosis device is normal or abnormal.   The status information communication system according to any one of claims 1 to 4, wherein a circuit from the transformer to the comparator through the rectifier circuit is duplicated.

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