JPH057680Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a storage display device for an alarm device.

Many conventional alarm devices issue an alarm in response to a signal issued when an abnormality detection device operates, and also store and display the occurrence of an abnormality.
However, most of these alarm devices are designed so that if the alarm is not emitted or the alarm is not memorized, the abnormality display also stops, so inspection and monitoring are not necessary. It is inconvenient when doing so.

For example, when a crime prevention alarm system equipped with a large number of anomaly detection devices is installed, storing and displaying the occurrence of an anomaly in each caution area is effective for management when no one is around, such as at night. However, when operating the security alarm device or when there are people around during the day, if the abnormality detection device is displayed without emitting an alarm such as a buzzer, it may be necessary to perform inspection or monitoring. It may be convenient. The object of this invention is to provide a storage and display device for this convenient alarm device configured with a simple circuit.

To accomplish this goal, an unusual logic combination of reset and set flip-flops was utilized. This combination is sometimes said to be ``prohibited'' (Shoji Ohama, ``Basics and Practice of Non-Contact Sequence Circuits,'' published by Tokyo Denki University Press, March 30, 1982, p. 115).

Examples will be described below with reference to the drawings.

The figure is a circuit diagram showing an embodiment of the present invention assembled using a negative logic input reset/set flip-flop constructed of a NAND gate TC4011BP. This circuit supplies power from a DC power source (not shown). NAND gates 2 and 3 constitute a reset/set flip-flop.
R and S indicate its input signals or terminals, and Q indicates its output. Contact 1 is a normally closed contact of the abnormality detection device, and current flows through resistor 8 during normal operation. When the abnormality detection device 1 operates, its contact 1
Since the current is briefly cut off by
It is input to the S terminal of the set flip-flop.

When the operation contact 7 is closed, the reset signal R to the reset/set flip-flop is no longer input, and the input of the set signal S is stored in the reset/set flip-flop, and the reset/set flip-flop is turned high. The output signal Q, which has reached the level, is transferred to the inverting amplifier 4.
, and is displayed by the light emitting diode 5. The resistor 6 is a protection resistor for the light emitting diode 5. In this circuit diagram, a four-input NAND gate 10 is provided, and one of the signals S operates a magnetic relay 12, and its contact 14 operates a buzzer 15 to issue an alarm.
The contact 13 of the magnetic relay 12 has the same role as the contact 1, and is used when sending a signal to the next stage alarm device. The light emitting diode 17 lights up when the operation contact 7 is closed, and when the abnormality detection device 1 is activated, this alarm device memorizes and displays the signal, and the buzzer 15 issues an alarm. Its role is to inform the operator of this.

When the operating contact 7 is opened, the light emitting diode 17
is off and the buzzer 1 is off even if the abnormality detection device 1 is activated.
5 will not raise an alarm. A reset signal R is input to the reset/set flip-flop. When the signal S is input in this state, an inverted output signal Q is obtained, and the light emitting diode 5 lights up. When the abnormality detection device returns to the normal state, the signal S disappears and the light emitting diode 5
goes out. That is, the reset/set flip-flop does not remember the operation of the abnormality detection device. Since the normally closed contact 13 of the magnetic relay 12 operates in accordance with the operation of the contact 1 even in this state, a signal can be sent to the next stage alarm device, etc.

The reset/set flip-flop circuit shown in the above embodiment includes not only a NAND gate but also a
It is well known that it can be constructed from NOR gates and transistors, and some have been constructed as integrated circuit elements. It is clear that they can be used to implement this invention. However, positive NAND
If the inverted output is taken out from the gate side of the reset terminal, such as the R/S latch TC4044BP, when implementing this idea, the connections between the reset terminal and the set terminal are switched and the output is taken out. It is necessary to devise a method of applying the signal S from the abnormality detection device to the terminal on the gate side.

Since the storage and display device of the alarm device according to this invention has the above-described configuration, it is possible to memorize and display the occurrence of an abnormality based on the signal emitted by the abnormality detection device, and also to emit an alarm sound such as a buzzer. It is now possible to easily display that the abnormality detection device is operating without any problems, and it becomes easier to inspect and monitor the operation of the abnormality detection device.
Therefore, it has a high practical value as a storage/display device for an alarm device, and has the effect of being easy to handle and configured with a simple circuit.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing one embodiment of this invention. Code 1 in the figure is the normally closed contact of the abnormality detection device.
2 and 3 are NAND gates that constitute a reset/set flip-flop, R and S are their input signals or terminals, Q is the output, 4 and 11 are inverting amplifiers, and 5
and 17 are light emitting diodes, 6, 8, 9 and 16 are electrical resistances, 7 is an operating contact, 10 is a NAND gate,
12 is a coil of a magnetic relay, 13 and 14 are its contacts, and 15 is a buzzer.

Claims (1)

[Scope of utility model registration request] In an alarm device that uses a reset/set flip-flop circuit to store and display a signal emitted when an abnormality detection device operates, a reset signal is sent to the reset terminal R of the reset/set flip-flop. The signal that is emitted when the abnormality detection device operates with input is input to the set terminal S, and an output signal Q that is forcibly inverted by the input signal of the set terminal S is obtained, and the abnormality detection device operates. A storage/display device for an alarm device, characterized in that the output signal Q can display the information without storing it.