JPH10222781A - Alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it clear which sensor detects is by displaying a lamp with an abnormal signal when abnormality of detected through a sensor, also holding the abnormal signal and displaying the lamp with the abnormal signal that is held when a signal is inputted by an external operation after lamp display is stopped. SOLUTION: An abnormal signal holding circuit 9 makes an output side that is linked with an F/F circuit 3 high level and also holds the state when an output of the circuit 3 is at high level and when one pulse signal is inputted through an OR circuit 8. When a reset switch 12 is turned on in this state, the ringing of a buzzer 6 is stopped. When a sensor 1 is normally restored by a clerk in charge, an abnormal signal deciding circuit 2 inverts an output signal from a high level to a low level and outputs a reset signal to the circuit 3. The circuit 3 inverts an output side from a high level to a low level, and a lamp display circuit 10 turns off a lamp 11 that is on. When the clerk turns on a switch 13, the lamp 11 which is turned off by the circuit 10 is turned on again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for issuing an alarm based on the detection of a sensor.

[0002]

2. Description of the Related Art A conventionally known alarm device, when an abnormality is detected through a sensor, sounds a buzzer and issues an alarm, and simultaneously turns on or blinks a lamp provided corresponding to the sensor. Notifying the staff of the error. When the reset switch is turned on by the attendant, the buzzer stops sounding, then the abnormality is eliminated, and when the sensor returns to normal, the lighting lamp is turned off.

[0003]

Incidentally, there is a case where the lamp is turned on, but is turned off before a staff member confirms the content of the abnormality. In such a case, it was not possible to check because it was not possible to determine whether it was due to a malfunction and which series of sensors was activated. In addition, even if a staff member confirms the fact before the lamp goes off, it depends on the memory, and there is something lacking in accuracy.

[0004]

An alarm device according to the present invention holds a sensor, an abnormality detection circuit for outputting an abnormality signal when an abnormality is detected through the sensor, and an abnormality signal output from the abnormality detection circuit. And an abnormality holding circuit that displays a lamp when the abnormality signal is input, stops displaying the lamp when the input of the abnormality signal is cut off, and displays the abnormality when a signal is input by an external operation A lamp display circuit for receiving the abnormal signal held by the holding circuit and displaying the lamp.

In the present invention, when an abnormality detection circuit detects an abnormality through a sensor, an abnormality signal is output to an abnormality holding circuit and a lamp display circuit, respectively. At this time, the abnormality holding circuit holds the input abnormal signal, and the lamp display circuit displays the lamp when the abnormal signal is input, and stops displaying the lamp when the input of the abnormal signal is interrupted. Then, when a signal is input by an external operation, the abnormality signal held by the abnormality holding circuit is taken in and the lamp is displayed.

[0006]

FIG. 1 is a block diagram of an alarm device according to an embodiment of the present invention, and FIG. 2 is a timing chart of the alarm device according to the present embodiment.

In the figure, 1 is a sensor selected according to the purpose, such as a temperature sensor for detecting temperature or a vibration sensor for detecting vibration. 2 is an abnormal signal judgment circuit,
A reference value is set according to each connected sensor 1. When the signal from the sensor 1 is lower than the reference value, a low-level signal is output. When the signal from the sensor 1 exceeds the reference value, the output is output. The signal is inverted to a high level, and the reset signal is output when the reset signal by turning on the reset switch 12 and the signal below the reference value by the normal return of the sensor 1 are input.

Reference numeral 3 denotes, for example, a D-type flip-flop circuit (hereinafter, referred to as "F / F circuit") having a set terminal and a reset terminal. When the output of the abnormal signal determination circuit 2 is inverted to a high level, a high-level signal is output. Output and hold,
When the reset signal is input, the output signal is inverted to low level. 4 is an OR circuit, the input terminals of which are F
The output terminal is connected to a buzzer circuit 5. The buzzer circuit 5 includes an OR circuit 4
When the output of the F / F circuit 3 becomes a high level, the buzzer 6 sounds and the state is maintained, and when the reset switch 12 is turned on, the buzzer 6 is released and the sound of the buzzer 6 is stopped.

Reference numeral 7 is a pulse generation circuit for outputting a signal of 1 pulse when the output of the F / F circuit 3 is inverted to a high level,
8 is an OR whose input terminal is connected to the output side of each F / F circuit 3 and whose output terminal is connected to the abnormal signal holding circuit 9.
Circuit. The abnormal signal holding circuit 9 is composed of, for example, a D-type flip-flop circuit. When a signal from the F / F circuit 3 is at a high level, a signal (1 pulse) of the pulse generation circuit 7 is input via the OR circuit 8. F / F
When the output side connected to the circuit 3 is set to a high level and the state is maintained, and another pulse generation circuit 7 generates one pulse, the output is inverted to a low level, and at the same time, the corresponding output side is set to a high level. Set to level and hold that state.

Reference numeral 10 denotes a lamp display circuit. When the output of the F / F circuit 3 becomes high level, a lamp 11 provided corresponding to the sensor 1 connected to the F / F circuit 3 is turned on.
When the output of the / F circuit 3 is inverted to the low level, the lamp 11 is turned off, and when the switch 13 is turned on, the high level signal held by the abnormal signal holding circuit 9 is taken in The lamp 11 to be turned on, that is, the lamp 11 turned off by the sensor 1 returning to the normal state is turned on again.

The operation of the alarm device constructed as above will be described with reference to the timing chart of FIG. The abnormal signal determination circuit 2 monitors whether or not the signal of the sensor 1 has exceeded the reference value, and when the signal exceeds the reference value, inverts the output signal to a high level and outputs the signal to the F / F circuit 3. Output to When a high-level signal is input, the F / F circuit 3 sets the output side to a high level and outputs it to the buzzer circuit 5 via the OR circuit 4 and the pulse generation circuit 7
To the lamp display circuit 10 and the abnormal signal holding circuit 9. At this time, the buzzer circuit 5 sounds the buzzer 6, the lamp display circuit 10 turns on the lamp 11 corresponding to the sensor 1 that has detected the abnormality, the pulse generation circuit 7 generates one pulse, and outputs the abnormality through the OR circuit 8. Output to the signal holding circuit 9. The abnormal signal holding circuit 9 has a function of F /
When a one-pulse signal is input through the OR circuit 8 when the output of the F circuit 3 is at the high level, the output side of the interconnection to the F / F circuit 3 is set to the high level and the state is maintained. .

When the reset switch 12 is turned on in this state, the buzzer circuit 5 stops the buzzer 6 from ringing,
When the sensor 1 returns to normal by the attendant, the abnormal signal determination circuit 2 inverts the output signal from high level to low level and outputs a reset signal to the F / F circuit 3. F
The / F circuit 3 inverts the output side from the high level to the low level by the input of the reset signal, and accordingly, the lamp display circuit 10 turns off the lamp 11 that is lit. Then, when the switch 13 is turned on by the clerk, the lamp display circuit 10 takes in the high level signal of the output of the abnormal signal holding circuit 9 and corresponds to the lamp 11 corresponding to the output, that is, the lamp 11. The extinguished lamp 11 is turned on again.

In this way, after the abnormality occurs, the sensor 1
Even if the lamp 11 goes out due to the normal recovery of the
When 3 is turned on, the extinguished lamp 11 can be turned on again, so even if the lamp 11 is extinguished before the staff member confirms the details of the abnormality, it is possible to know which sensor 1 detected the sensor 1. If it is determined that the sensor 11 is malfunctioning, there is an effect that a circuit inspection of the sensor 11 can be performed. Further, since a storage element such as a memory is not used in a circuit for holding the abnormality, there is an effect that the circuit configuration is simple.

[0014]

As described above, according to the present invention, when an abnormality is detected through a sensor, a lamp is displayed with an abnormal signal, the abnormal signal is held, and after the display of the lamp is stopped, a signal is output by an external operation. When an input is made, the lamp is displayed with the abnormal signal that was held, so even if the lamp disappears before the staff member confirms the content of the abnormality, it is possible to know which sensor has detected it, and it will malfunction. In the case of, there is an effect that the circuit inspection of the interconnection of the sensor becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of an alarm device according to an embodiment of the present invention.

FIG. 2 is a timing chart of the alarm device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sensor 2 Abnormal signal determination circuit 3 F / F circuit 4 OR circuit 6 Buzzer 7 Pulse generation circuit 8 OR circuit 9 Abnormal signal holding circuit 11 Lamp 12 Reset switch

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Bunji Matsushita 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (2)

[Claims] An abnormality detection circuit that outputs an abnormality signal when an abnormality is detected through the sensor; an abnormality holding circuit that holds an abnormality signal output from the abnormality detection circuit; When the input of the abnormality signal is interrupted, the display of the lamp is stopped, and when a signal is input by an external operation, the abnormality signal held by the abnormality holding circuit is fetched to acquire the abnormality signal. An alarm device comprising: a lamp display circuit for displaying a lamp. 2. The abnormality holding circuit includes a pulse generation circuit that generates a one-pulse signal when the abnormality signal of the abnormality detection circuit is input, and the abnormality generation when the pulse signal of the pulse generation circuit is input. 2. The alarm device according to claim 1, further comprising an abnormal signal holding circuit that holds a signal.