JPH0572003A - Abnormal signal detection system - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain an abnormal signal detection method that identifies a facility-specific abnormality that occurred during the delay timer signal extraction delay time for preventing false alarms. [Composition] Full-filled electrode rod 3 caused by shaking of water level 2
However, if there is a delay timer that delays the signal extraction for a certain period of time, which is provided in order not to identify the repeated operation of the abnormal contact 6 as an abnormality, which is not a facility abnormality due to touching or non-touching, a monitoring timer and its The monitoring device 7 is provided with a counter for counting the number of repeated operations of the abnormal contact 6 within a time period, and if the counter has an abnormal set value, the content thereof is identified as a facility-specific abnormality such as chattering. [Effect] The reliability of abnormal signal detection is improved by being able to identify the facility-specific abnormality that occurred during the signal extraction delay time by the delay timer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal signal detection system for a monitoring device which constantly monitors abnormal contact signals of various facilities.

[0002]

2. Description of the Related Art When an abnormal contact signal constantly monitored by a conventional monitoring device changes from insignificant to significant or from significant to insignificant, or accidental change in abnormal contact signal is prevented from being falsely reported as an abnormality. Therefore, there is a monitoring device that identifies the contents as an abnormality only when the state is continued for a certain time after the contact signal is changed.

In the above monitoring device, when an abnormal signal is identified, its content is displayed on a display device or notified to an external center.

[0004]

SUMMARY OF THE INVENTION As in the conventional method, when the abnormal contact signal changes from insignificant to significant or from significant to insignificant and the state continues for a certain period of time, the content is identified as abnormal. Abnormality peculiar to equipment that repeats a change from insignificant to significant or from significant to insignificant due to contact chattering etc. within a fixed time If there is repeated contact repeat operation, it cannot be immediately recognized as an abnormality and there is a delay in coping with abnormal conditions was there.

The present invention solves such a problem, and distinguishes between the abnormal contact repetitive operation peculiar to the equipment, which repeats from insignificant to significant or from significant to insignificant within the above-mentioned fixed time, and the contact repetitive operation without equipment abnormality, The purpose is to prevent false alarms and identify equipment abnormalities.

[0006]

An abnormal signal detection system according to the present invention constantly monitors an abnormal contact signal for notifying an abnormal state of various equipment by a contact output, and the abnormal contact signal is insignificant or significant. A monitoring device that changes to an unintentional state and notifies the abnormality when the state change continues for a certain period of time, a timer unit that counts a certain period of time after the state change is detected, and the state of an abnormal contact signal within the certain period of time being measured. A counter unit that counts the number of change repetitions and a contact abnormality determination unit that determines and notifies an abnormal operation of an abnormal contact when the number of times the number of changes reaches a set value or more are provided.

[0007]

According to the present invention, after the state change of the abnormal contact signal, if the counter unit determines that the state change has been repeated a predetermined number of times or more within the fixed time set by the timer unit, the state is changed. It is possible to prevent an erroneous notification of equipment abnormality notification by distinguishing between the accidental operation of the abnormal contact signal and the occurrence of an abnormality in various equipment by assuming that an abnormal operation has occurred due to chattering of the abnormal contact and the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a system that implements the abnormal signal detection method according to the present embodiment. In the figure, 1 is a water tank in which the water level 2 is stored, 3 is a full-filled electrode rod that detects fullness due to fluctuations in the water level 2, 4 is a reduced-water electrode rod that detects reduced water due to changes in the water level 2, and 5 is a full-filled electrode rod 3. Based on the water level 2 detected by the water reduction electrode rod 4, various equipment control panels that consider the state as abnormal, 6 are abnormal contact points that use the abnormalities that are considered by various equipment control panels as contacts, and 8 is the identified abnormality. The display device 9 for displaying is an external center to which the identified abnormality is notified.

Reference numeral 7 is a monitoring device which is identified as an abnormality. As shown in FIG. 2, an I / O port 7a, a RAM 7b and a CPU 7 are provided.
c, a computer 7e provided with a ROM 7d.

The operation of the monitoring device configured as described above will be described with reference to the flowchart shown in FIG. First, in step 101, if it is detected that the abnormal contact point 6 has changed from insignificant to significant or from significant to insignificant, the process proceeds to step 102, and it is a contact repetitive operation with no equipment abnormality and abnormal operation of the abnormal contact 6 is prevented to prevent false operation. If the delay timer for monitoring the duration is not set for the abnormal contact 6, the process proceeds to step 109. Step 109
In this case, the details of the abnormality are displayed on a display device or notified to an external center.

If a delay timer is set for the abnormal contact 6 in step 102, step 10
3, the process proceeds to step 109 if the changed state of the abnormal contact 6 continues for the delay timer time, otherwise proceeds to step 104. In step 104,
Distinguish between a false alarm, which is a contact repeat operation that is not equipment abnormality due to shaking of the water level of an aquarium due to an earthquake, and a content that is an abnormal contact repeat operation unique to equipment that is caused by chattering of the abnormal contact 6, and identifies the content as an abnormality. In order to
If the monitoring timer that determines the time for counting the number of abnormal contact repetitions from the contact repeat operation detection time of step 101 is not set for the abnormal contact 6, the process returns to step 101, and if it is set, the process proceeds to step 105.

Then, in step 105, if the monitoring timer is continuing, the process proceeds to step 107. If not, the process proceeds to step 106 to start the monitoring timer and then proceeds to step 107. In step 107, the number of repeated abnormal contact points in step 101 is counted. However, in step 105, when the monitoring timer exceeds the predetermined time, step 107
And the continuation of the monitoring timer in step 105 are cleared. Further, the process proceeds to step 108 and step 107
If the number of times counted in step 3 is a set value abnormality, the procedure goes to step 109, and the abnormality content is displayed on the display device or notified to an external center.

In short, in the first embodiment, the monitoring device 7
In addition, when there is a delay timer for preventing false alarm due to shaking of the water level of the water tank due to an earthquake, etc., the abnormal contact repetitive operation due to chattering within the delay timer time is abnormally identified.

Therefore, while maintaining the function of preventing false alarms due to fluctuations in the water level of the water tank, the content of repeated abnormal contact operation due to chattering is identified as abnormal, and the content is displayed on a display device or displayed on an external center. You can report.

[0015]

According to the present invention, in order to prevent the accidental operation of the abnormal contact from being falsely reported as the occurrence of an abnormality, the chattering of the abnormal contact is unique to the equipment during the delay time for delaying the contact signal extraction time. Even if an abnormal contact repeat operation occurs, the operation can be identified as a contact abnormality and displayed or reported on the display device, so that the reliability of contact abnormality monitoring can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram conceptually showing an embodiment of the present invention.

FIG. 2 is a conceptual circuit diagram showing an electrical connection of the equipment of FIG.

FIG. 3 is a flowchart explaining the operation of the apparatus of FIG.

[Explanation of symbols]

 5 Equipment control panel 6 Abnormal contact 7 Monitoring device 8 Display device 9 External center

Claims (1)

[Claims] 1. An abnormal contact signal that reports an abnormal state of various equipment by a contact output is constantly monitored, and the abnormal contact signal changes from insignificant to significant or from significant to insignificant, and the state change continues for a certain period of time. In an abnormal signal detection method equipped with a monitoring device that sometimes notifies an abnormality, the monitoring device has a timer unit that counts a fixed time after the state change is detected, and a status change of an abnormal contact signal within a fixed time being measured. An abnormal signal detection method comprising: a counter unit that counts the number of repetitions; and a contact abnormality determination unit that determines and notifies an abnormal operation of an abnormal contact when the count value reaches or exceeds a set value.