JPH06266986A - Disaster prevention monitor - Google Patents

Abstract

PURPOSE:To add a fail safe function, and to improve the reliability of an equipment by forcedly resetting a latching relay at the time of supplying a power source. CONSTITUTION:A command signal for designating a terminal address is transmitted from a receiving means 10 to a terminal l1, and the terminal 11 whose address is matched with the terminal address driving-controls a control load 26 based on the received command signal. The terminal 11 is equipped with a latching relay 70 which switches the first contact to the second contact when it is set, and switches the second contact to the first contact when it is reset, set circuit 72 which sets the latching relay 70, reset circuit 74 which resets the latching relay 70, and a driving means 76 which forcedly drives the reset circuit 74 at the time of applying the power source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disaster prevention monitoring device for controlling terminal equipment such as a district bell and a fire door by setting and resetting a latching relay.

[0002]

2. Description of the Related Art In a conventional disaster prevention monitoring device, a receiver outputs an instruction to acquire terminal information to all fire sensors, and each fire sensor fires at the time of receiving the acquisition instruction from the receiver. The detected amount related to the phenomenon is detected and held, and then the information held in the terminal is collected by polling from the receiver.On the other hand, by setting the latching relay, the contact is connected to the control load and the power supply is connected. By supplying the power, driving the control load, and resetting the latching relay, the contact is connected to the side not controlling the control load, the power is not supplied to the control load, and the control load is not driven.

[0003]

However, in such a conventional disaster prevention monitoring device, when the contact is switched to the control load side due to an external factor such as vibration, the power is turned on in that state. If this happens, the control load will be driven. Specifically, if the control load is, for example, a bell, the bell will ring, and if the control load is a fire door, the fire door will operate.

As a result, there is a problem that the reliability of the disaster prevention monitoring device is lowered. The present invention has been made in view of such conventional problems, and forcibly resets the latching relay when the power is turned on, thereby adding a fail-safe function and improving the reliability of the device. With the goal.

[0005]

FIG. 1 is a diagram for explaining the principle of the present invention. The present invention is a disaster prevention system in which a command signal specifying a terminal address is transmitted from the receiving means 10 to the terminal 11 and drive control of the control load 26 is performed based on the command signal received by the terminal 11 whose self-address matches the terminal address. A latching relay 70 for switching the first contact to the second contact by setting the terminal 11 to the monitoring device, and switching from the second contact to the first contact by resetting, and the latching relay. A set circuit 72 for setting 70, a reset circuit 74 for resetting the latching relay 70, and a driving means 76 for forcibly driving the reset circuit 74 when the power is turned on are provided.

Further, according to the present invention, the terminal 11 has a repeater connected to the signal line from the receiving means 10 and a control load 26 connected to one or a plurality of control lines from the repeater.
The latching relay 70, the setting circuit 72, the reset circuit 74, and the driving means 76 are provided in the repeater, and the latching relay 70 is provided when the power is turned on.
Is forcibly reset.

Further, according to the present invention, from the first contact to the second contact,
When the contact point is switched to, the control load 26 is supplied with power, and when the second contact point is switched to the first contact point,
It is characterized in that the control load 26 is not controlled. The present invention also provides the set circuit 72.
Is provided with a transistor connected to the set coil of the latching relay 70, a resistor connected to the base side of the transistor, and a photocoupler connected in series with the resistor.

The present invention also provides the reset circuit 74.
Is provided with a transistor connected to the reset coil of the latching relay 70, a resistor connected to the base side of the transistor, and a photocoupler connected in series with the resistor. Further, according to the present invention, the driving means 76 causes at least a transistor that is turned on when the power is turned on, and the reset circuit 7 by turning on the transistor.
4 is provided with a CR circuit that outputs a drive pulse.

[0009]

According to the disaster prevention monitoring apparatus of the present invention having such a structure, the driving means 76 drives the reset circuit 74 to forcibly reset the latching relay 70 when the power is turned on. Even if the first contact of the relay 70 is switched to the second contact due to an external factor such as vibration, it is possible to forcibly switch from the second contact to the first contact.

As a result, a fail safe function is added,
The reliability of the device can be improved. That is, since the first contact is switched to the second contact due to an external factor such as vibration, it is possible to prevent the bell from ringing and the fire door from operating when the power is turned on.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is an explanatory diagram showing the overall structure of a disaster prevention monitoring apparatus according to an embodiment of the present invention. In FIG. 2, 10 is a receiver, which is installed in a central monitoring room, a manager's room, or the like. From the receiver 10, a signal line 12 as a transmission line
And the power line 14 is pulled out, and the sensor repeater 16,
The analog sensor 18 and the control relay 20 are connected. A power / combined signal line 22 is drawn from the sensor repeater 16, and one or a plurality of on / off sensors 24 are connected to the power / combined signal line 22.

The analog sensor 18 has a built-in function as a repeater, and sends the analog signal detected by the heat sensor or smoke density sensor to the receiver 10. Control repeater 20
In this embodiment, four control loads 26 are connected to each other by a control line 25. The control load 26 is an appropriate disaster prevention device such as a district bell, a fire door release, a solenoid for driving a damper of a smoke outlet, a motor, or the like.

On the other hand, the receiver 10 is provided with a control unit 28 using a CPU, and for the control unit 28, a display unit 30,
An operation unit 32, a sounding unit 36, and a power supply unit 38 are provided. The control unit 28 of the receiver 10 creates a telegram having a format configuration including a terminal address and a control command and sends it out to the signal line 12, and the sensor repeater 16 and the analog sensor 1
8 and the control repeater 20 are being polled.

Repeater 16 for sensor, analog sensor 18
A unique terminal address is preset in each of the control relay 20 and the control relay 20, and when the self-address matches the terminal address sent from the receiver 10, the processing based on the received command signal is executed. . in this case,
Repeater 16 for sensor for polling in steady state
Since the analog sensor 18 has a return command of detection information, it generates response data of its own address and detection information at that time and returns it to the receiver 10.

In the control repeater 20, the line monitoring control processing is performed by the line monitoring command at normal times, and at the time of fire, a control command for driving the control load 26 following the terminal address is issued. The control load 26 that is received is driven based on the received control command. The operation unit 32 of the receiver 10 is provided with a manual recovery switch 34, and by manually operating the recovery switch 34, for example, the sensors in the alarm state are simultaneously recovered.

The control unit 28 of the receiver 10 has a function as a monitoring command means 28A for commanding the monitoring of the line state,
The line monitoring command signal is transmitted every predetermined time, for example, every second. FIG. 3 is a timing chart showing calling and response in the steady monitoring state between the receiver 10 and the repeater shown in FIG.

In FIG. 3, the receiver 10 has a call command C1 and terminal addresses A1, A2, A3, A4, ...
・ The ringing signals including are transmitted sequentially. As shown in FIG. 4, the calling signal is composed of an 8-bit command field, an 8-bit address field, and an 8-bit checksum field, which are three bytes. A start bit, a parity bit, and a stop bit are provided before and after each byte. The command field is used to indicate to all terminals what the call signal from the receiver 10 means, regardless of the address.

When the address included in the call signal is matched and collated with respect to the call signal from the receiver 10, the terminal response signal is transmitted as shown in the repeaters 20-1, 20-2 and 20-3. Sent out. As shown in FIG. 5, the terminal response signal is composed of 2 bytes of an 8-bit data field and an 8-bit checksum field, and a start bit, a parity bit and a stop bit are provided before and after each byte. There is.

Next, FIG. 6 shows the control repeater 2 shown in FIG.
2 is a circuit block diagram showing an example of No. 0. In FIG. 6, a pair of signal lines 12 is connected between the terminals S and SC of the control repeater 20. Following the terminals S and SC, a diode D1 and a zener diode ZD1 for absorbing surge are provided. Subsequently, the constant voltage circuit 40 is provided, and the control IC
DC 3.2V required for driving etc. is created. A transmission / reception circuit 42 is provided following the constant voltage circuit 40, and the transmission / reception circuit 42 is provided with a transmission indicator lamp 44 which blinks in a transmission / reception state.

The transmission / reception circuit 42 detects, for example, transmission data from the receiver 10 from a change in line voltage, and outputs a reception signal to the control circuit 46. Also, the transmission data from the control circuit 46 is converted into a current signal and sent to the signal line 12. An address setting circuit 48 is provided for the control circuit 46. The address setting circuit 48 is provided with an address setting switch 50 using a DIP switch, and sets a predetermined terminal address, specifically, a group address to which the repeater belongs and a unique terminal address.

The control circuit 46 is connected to the first contact 52 that does not control the control load 26 in the normal monitoring state, and receives the control signal from the receiver 10 from the first contact 52 to the second contact 54. And a switching control means 46A for supplying power to the control load 26 via the pair of control lines 25.
Has the function of. That is, when the photocoupler PC3 of the control circuit 46 emits light, the photocoupler PC3 of the relay drive circuit 56 receives the light and energizes the reset coil R to reset the latching relay and connect it to the first contact 52. After that, even if the power supply to the reset coil R is cut off, the state of being connected to the first contact 52 is mechanically maintained.

On the other hand, the first contact 52 to the second contact 54
To switch to, the set coil S must be energized. When the photocoupler PC2 of the control circuit 46 is caused to emit light, the photocoupler PC2 of the relay drive circuit 56 receives the light, and the set coil S is energized to set the latching relay, thereby connecting to the second contact 54. 5
Reference numeral 8 denotes a power supply line monitoring circuit as a monitoring means, and the power supply line monitoring circuit 58 monitors the line state of the power supply line 14.

When the control circuit 46 decodes the line monitoring command signal transmitted from the receiver 10 every one second, the photocoupler PC1 of the control circuit 46 causes the photocoupler PC1 to have a predetermined time, for example, 1 millisecond.
Light is emitted between ec, and the photocoupler PC of the power line monitoring circuit 58
1 receives the light and drives the switching means described later. When the switching means is turned on, the power supply line monitoring circuit 58 is driven to monitor the power supply line 14. When there is no abnormality in the power supply line 14, the photocoupler PC6 of the power supply line monitoring circuit 58 emits light, and the photocoupler PC6 of the control circuit 46 receives the light. Inform 10

Reference numeral 60 denotes a control line monitoring circuit as a monitoring means. The photocoupler PC4 of the control line monitoring circuit 60 emits light when the control line 25 is disconnected, and the photocoupler PC5 emits light when the control line 25 is short-circuited. Photocoupler P of control circuit 46
C4 receives the light emitted from the photocoupler PC4 of the control line monitoring circuit 60, and the photocoupler PC5 of the control circuit 46 receives the light emitted from the photocoupler PC5 of the control line monitoring circuit 60 to control line 2
The disconnection or short circuit of 5 is discriminated and the receiver 10 is notified via the transmission / reception circuit 42.

Reference numeral 62 denotes a negative voltage circuit as a negative voltage generating means. The negative voltage circuit 62 is charged by the power source voltage via the diode D101 connected to the power source line 14, and when the switching means is turned on, A negative voltage is generated and the negative voltage drives the power supply line monitoring circuit 58 and the control line monitoring circuit 60. A constant voltage circuit 64 holds the negative voltage generated by the negative voltage circuit 62 constant.

Next, FIG. 7 shows the relay drive circuit 56 of FIG.
Specific circuit configurations of the power supply line monitoring circuit 58, the control line monitoring circuit 60, the negative voltage circuit 62, and the constant voltage circuit 64 are shown. In FIG. 7, reference numeral 56 is the relay drive circuit, and the relay drive circuit 56 includes (1) a diode D101 and a resistor R1.
01, capacitor C101 and Zener diode ZD
A power supply voltage supply circuit 66 composed of 103, and (2) transistors Tr101 and Tr104 and resistors R104 and R10.
A current limiting circuit 68 composed of 5 and (3) reset winding R, set winding S, diodes D102-1 and D102.
-2, the latching relay 70, and (4) the photocoupler PC2, the capacitor C105, and the resistors R102 and R10.
3 and a transistor Tr102, and a set circuit 72 for setting the latching relay 70, and (5) a photocoupler PC3, a capacitor C106, resistors R106, R.
107 and a transistor Tr103, and a reset circuit 74 for resetting the latching relay 70,
(6) Transistors Tr109 and Tr110, resistor R1
18, R119, R120, R121, R122, R1
23, a Zener diode ZD101, and a capacitor C107, and is composed of a driving means 76 for driving the transistor Tr105 (switching means).

Here, the main part of the present invention is the driving means 7
6, the drive means 76 will be described in more detail. The base side of the transistor Tr109 to which the charging voltage from the capacitor C101 is applied has a voltage dividing resistor R121,
R122 is provided, and these voltage dividing resistors R121 and R1 are provided.
22 in series with a Zener diode ZD101 and a resistor R12
3 are connected. The base of the transistor Tr110 is connected to the collector side of the transistor Tr109 via voltage dividing resistors R119 and R120.
The collector of r110 is connected between the Zener diode ZD101 and the resistor R123, and the emitter is connected to the ground line.

A resistor R118, a capacitor C107, and a resistor R10 are provided on the collector side of the transistor Tr109.
6 is connected, and C is connected by the capacitor C107 and the resistor R106.
It constitutes an R circuit. The CR circuit is connected to the base of the transistor Tr103 of the reset circuit 74. When the power is turned on, the charging voltage of the capacitor C101 rises, reaches the Zener voltage of the Zener diode ZD101, and the voltage generated in the resistor R121 is the transistor Tr.
Under the condition that 109 is turned on, the transistor Tr10
9 is turned on, and turning on the transistor Tr109 also turns on the transistor Tr110. The transistor Tr110 has a function of keeping the transistor Tr109 in the on state.

When the transistor Tr109 is turned on, a transient current flows in the CR circuit composed of the capacitor C107 and the resistor R106, biasing the transistor Tr103,
A reset pulse is applied to the transistor Tr103. As a result, the transistor Tr103 is forcibly turned on temporarily, the reset circuit 74 is driven, and the latching relay 70 is reset. Therefore, when the power is turned on, the second contact 54 is forcibly switched to the first contact 52 even if it is connected to the second contact 54 due to some influence. As a result, the control load 26 is not supplied with the power supply voltage and does not operate.

Further, when there is a command signal for driving the control load 26 from the receiver 10, the photocoupler PC2 of the control circuit 46 emits light, and the photocoupler PC of the relay drive circuit 56.
2 receives light, the transistor Tr102 is turned on, the latching relay 70 is set, and the first contact 52 is switched to the second contact 54. In addition, if there is a command signal from the receiver 10 that does not drive the control load 26,
The photocoupler PC3 of the control circuit 46 emits light, and the photocoupler PC3 of the relay drive circuit 56 receives the light.
The r103 is turned on, the latching relay 70 is reset, and the second contact 54 is switched to the first contact 52.

Reference numeral 58 is the power supply line monitoring circuit, and the power supply line monitoring circuit 58 is a photocoupler PC1 and a photocoupler PC6.
It consists of resistors R108, R109, R112, and a transistor Tr105 as a switching means. When the photocoupler PC1 of the control circuit 46 emits light for a predetermined time, for example, every 1 second, the photocoupler P1 of the power line monitoring circuit 58.
C1 receives the light and turns on and off the transistor Tr105. When the transistor Tr105 is turned on, the positive terminal of the capacitor C102 is connected to the ground, so the negative terminal of the capacitor C102 becomes a negative voltage when viewed from the ground, and as a result, the charging voltage of the capacitor C102 biases the photocoupler PC6 and the photocoupler PC6 is biased. The PC 6 emits light to send a normal signal to the photocoupler PC 6 of the control circuit 46. Of course, if there is an abnormality (disconnection or short-circuit) in the power supply line 14, the photocoupler PC6 does not emit light, so the photocoupler PC6 of the control circuit 46 cannot receive light and detects an abnormality in the power supply line.

Reference numeral 62 is the negative voltage circuit, and the negative voltage circuit 62 comprises a resistor R110, a capacitor C102, diodes D103-1, D103-2 and a zener diode ZD104. The power supply voltage from the power supply line 14 is charged in the capacitor C102 via the resistor R110, and the charging current of the capacitor C102 flows to the ground line via the diode D103-2 when the power is turned on. When the transistor Tr105 turns on, the capacitor C102
Since the positive terminal of is connected to the ground, a negative voltage is generated on the negative terminal side of the capacitor C102, and the generated negative voltage supplies the charging voltage of the capacitor C102 to the power supply line monitoring circuit 58 and the control line monitoring circuit 60. It

Reference numeral 64 is a constant voltage circuit, and the constant voltage circuit 64
Is a transistor Tr106 and a Zener diode ZD10
2, a resistor R111 and a capacitor C103.
The constant voltage circuit 64 stabilizes the negative voltage generated by the negative voltage circuit 62 and supplies it to the control line monitoring circuit 60. The control line monitoring circuit 60 includes a photo coupler PC4, a photo coupler PC5, and resistors R113, R114, R115, R116, R11.
7, a transistor Tr107, Tr108, a capacitor C104, a diode D104, a third contact 78, and a fourth contact 80.

In a normal state, that is, when a negative voltage is output from the negative voltage circuit 62 when the terminal B-BC is terminated by a resistor (terminating portion) 82 having a predetermined impedance, the photocoupler PC5 is caused to emit light. Current does not flow, the photocoupler PC5 turns off, and the transistor Tr10
A current flows through the base of transistor 8, and the transistor Tr108 is turned on. When the transistor Tr108 turns on,
Since the transistor Tr107 is turned off, the photocoupler PC4 is also turned off. Thus, under normal conditions, the photocouplers PC4 and PC5 are turned off.

On the other hand, when the control line 25 is broken, no current flows through the base of the transistor Tr108, the transistor Tr108 is turned off, and the terminal BBC and the resistor R are connected.
114, a current flows through the base of the transistor Tr107, and the transistor Tr107 is turned on. For this reason,
The photocoupler PC4 emits light and sends a disconnection signal to the photocoupler PC4 of the control circuit 46.

When the control line 25 is short-circuited, a current flows through the photocoupler PC5, the photocoupler PC5 emits light, and a short-circuit signal is sent to the photocoupler PC5 of the control circuit 46.
The third contact 78 is opened when the latching relay 70 is reset and closed when set. As a result, when the first contact point 52 is switched to the second contact point 54, a disconnection appears to occur. Therefore, the photocoupler PC4
To prevent it from turning on.

The fourth contact 80 is closed manually. As a result, the disconnection short circuit is not monitored. That is, the diodes D105-1 and D105-2 connected in series to the control load 26 may be forgotten to be attached at the time of construction, or the polarities may not be connected as specified. In such a case, temporary disconnection may occur. It is also possible not to monitor the short circuit.

Next, the operation will be described with reference to FIGS. 7 and 8. First, when the power is turned on, the power supply voltage is applied between the terminals BB and BBC. The state of voltage application is shown in FIG.
It is shown in (A). When the power is turned on, the capacitor C10
When the charging voltage of No. 1 rises, the positive electrode of the capacitor C101, the transistor Tr109, the resistors R121, R12
2. A current flows through the Zener diode ZD101, the resistor R123, and the negative electrode of the capacitor C101.

The voltage at each point (A to E) is shown in FIG. When the power is turned on (A), the capacitor C101 is charged as shown in (B). When the charging voltage of the capacitor C101 reaches the Zener voltage of the Zener diode ZD101, the voltage at point D in FIG. 7 rises as shown in (D).
Furthermore, the voltage across the resistor R121 is the same as the transistor Tr109.
8B, the transistor Tr109 is turned on, and the voltage at the point C in FIG. 7 becomes as shown in (C) in FIG.

When the transistor Tr109 turns on, the transistor Tr110 also turns on, and the voltage at point D in FIG.
It is pulled down to the ground level as shown in FIG. When the transistor Tr110 is turned on, the voltage drop generated in the resistor R123 is absorbed, and the charging voltage of the capacitor C101 when the transistor Tr109 turns off becomes lower than the charging voltage when the transistor Tr109 turns on.

This indicates that the driving means 76 has hysteresis. Transistor Tr110
Has a function of holding the transistor Tr109 on. On the other hand, when the transistor Tr109 is turned on, a transient current flows in the CR circuit including the capacitor C107 and the resistor R106, and a reset pulse as shown in (E) of FIG. 8 is generated at point E of FIG. Turn on temporarily.

At this time, the voltage at the point F in FIG. 7 becomes a voltage as shown in FIG.
Is reset. Thus, when the power is turned on, the transistor Tr109 is turned on, a transient current is passed through the CR circuit to generate a reset pulse, and the transistor Tr109 is turned on.
Since the 103 is temporarily turned on, the latching relay 70 can be forcibly reset.

As a result, the first contact 5 on the non-control side
It can be forcibly switched to 2. Therefore, it is possible to reliably prevent the control load 26 from operating. As a result, a fail-safe function can be added and the reliability of the device can be improved.

In the above embodiment, the case where only the receiver 10 is provided as the receiving means is taken as an example. However, when the equipment scale further increases, the receiver installed in the central monitoring room is connected via the signal line. For example, a relay board is installed as a local receiver on each floor, and control relays 20-1 and 20-2 are connected to each of the relay boards via a signal line 12 as shown in the receiver 10 of FIG. Take a configuration.

Therefore, in the case of such a large scale system, the receiving means includes a receiver and a relay board as a local receiver. In addition, in the facility configuration in which the main receiver that controls the local receiver is not provided, and only the local receivers are distributed on each floor to perform the functions of the receivers, The receiving means of can also be configured only by a local receiver.

[0046]

As described above, according to the present invention, even if the contacts of the latching relay are switched due to external factors such as vibration, the latching relay is forcibly reset by the driving means when the power is turned on. Since the contact is switched to the non-control side, a fail-safe function can be added and the reliability of the device can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention.

FIG. 2 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a transmission operation between a receiver and a repeater.

FIG. 4 is an explanatory diagram of a message format from a receiver.

FIG. 5 is an explanatory diagram of a message format from a repeater.

FIG. 6 is a block diagram of a control repeater.

FIG. 7 is a circuit diagram including a relay drive circuit.

FIG. 8 is a diagram showing voltages at respective points.

[Explanation of symbols]

 10: receiver 11: terminal 12: signal line 14: power line 16: sensor repeater 18: analog sensor 20: control repeater 22: power / signal line 24: on / off sensor 25: control line 26: control Load 28: Control unit 28A: Monitoring command means 30: Display unit 32: Operation unit 34: Valve recovery switch 36: Ringing unit 38: Power supply unit 40: Constant voltage circuit 42: Transmission / reception circuit 44: Transmission indicator lamp 46: Control circuit 46A : Switching control means 48: Address setting circuit 50: Address setting switch 52: First contact 54: Second contact 56: Relay drive circuit 58: Power line monitoring circuit (monitoring means) 60: Control line monitoring circuit (monitoring means) ) 62: Negative voltage circuit (negative voltage generating means) 64: Constant voltage circuit 66: Power supply voltage supply circuit 68: Current limiting circuit 70: Latching relay 72: Set times 74: Reset circuit 76: drive means 78: third contact 80: fourth contact 82: resistor (termination)

Claims (6)

[Claims] 1. A disaster prevention monitoring apparatus for transmitting a command signal designating a terminal address from a receiving means to a terminal, and controlling driving of a control load based on a command signal received by a terminal whose self-address matches the terminal address. A latching relay that switches from the first contact to the second contact by setting the terminal and switches from the second contact to the first contact by resetting; and a setting circuit that sets the latching relay, A disaster prevention monitoring device comprising: a reset circuit for resetting the latching relay; and drive means for forcibly driving the reset circuit when the power is turned on. 2. The disaster prevention monitoring device according to claim 1, wherein the terminal includes a relay connected to the signal line from the receiving means and a control load connected to one or a plurality of control lines from the relay. A disaster prevention monitoring device, comprising: a relay, the latching relay, the set circuit, the reset circuit, and the driving means, and forcibly resetting the latching relay when power is turned on. 3. The disaster prevention monitoring device according to claim 1, wherein when the first contact is switched to the second contact, power is supplied to the control load and the second contact is connected to the first contact. The disaster prevention monitoring device is characterized in that the control load is not controlled when switched to. 4. The disaster prevention monitoring device according to claim 1, wherein the set circuit includes a transistor connected to the set coil of the latching relay, a resistor connected to a base side of the transistor, and a resistor connected in series. A disaster prevention monitoring device comprising a photocoupler connected to. 5. The disaster prevention monitoring device according to claim 1, wherein the reset circuit includes a transistor connected to a reset coil of the latching relay, a resistor connected to a base side of the transistor, and the resistor. A disaster prevention monitoring device comprising a photocoupler connected in series. 6. The disaster prevention monitoring device according to claim 1 or 2, wherein the driving means includes at least a transistor which is turned on when power is turned on, and a CR circuit which outputs a driving pulse for driving the reset circuit when the transistor is turned on. Disaster prevention monitoring device characterized by being equipped.