JP2902258B2 - Disaster prevention monitoring device - Google Patents

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 collecting terminal information by a call from a receiving side and centrally monitoring a fault such as a disconnection.

[0002]

2. Description of the Related Art Conventionally, as this kind of disaster prevention monitoring device,
For example, JP-A-1-159797 is known. In this disaster prevention monitoring device, the receiver outputs a terminal information acquisition command to all fire sensors, and each fire sensor detects the detection amount related to the fire phenomenon when it receives the acquisition command from the receiver. After that, the information held in the terminal was collected by polling from the receiver.

When a terminal has a fault such as a disconnection, a fault signal has been transmitted to a receiver. In addition, when transient noise generated when a fluorescent lamp is turned on is superimposed on the transmission path, for example,
Since the receiver cannot decode the signal from the terminal, the failure of the transmission path is reported by the display means.

[0004]

However, in such a conventional disaster prevention monitoring device, when noise is superimposed on the transmission line, the failure is reported by the display means. In spite of the transient noise, it is necessary to take measures, and there is a problem that reliability is reduced.

The present invention has been made in view of such a conventional problem, and does not immediately perform a display based on a failure judgment when transient noise is superimposed. Thus, the object is to increase the reliability of the device.

[0006]

FIG. 1 is a diagram illustrating the principle of the present invention. The present invention is directed to a disaster prevention monitoring device that collects terminal information by making a call from a receiving unit 10 to a terminal 11 by designating an address, and determines whether the receiving unit 10 has received a response from the terminal 11. 32A, a confirmation command transmitting means 32B for transmitting a confirmation command for confirming the type of the failure to the terminal when there is no response, and a first failure for displaying the failure type when a response to the failure signal is received. A display control means 32C and a second fault display control means 32D for displaying a predetermined fault when there is no response again and no response is received even after a predetermined polling period, and the terminal 11 detects the fault and sends an address. When a non-response unit 44A that does not respond to the designated call and a confirmation command for confirming the type of the failure are received from the reception unit 10, a failure signal is transmitted. That fault signaling means 4
4B is provided.

In the present invention, the terminal 11 comprises a repeater 14 connected to a transmission line from the receiving means 10 and a detector connected to a line from the repeater 14 for detecting an abnormality such as a fire. The repeater 14 is provided with the non-response means 44A and the fault signal transmission means 44B. Further, the present invention is characterized in that the failure signal includes failure information such as disconnection of the transmission line, disconnection of the line, and short circuit.

Further, the present invention is characterized in that the terminal 11 is an analog sensor connected to the receiving means 10 and provided with the non-response means 44A and the fault signal transmitting means 44D. Further, the present invention provides the receiving means 10
However, the terminal 11 is connected to the receiver only.

Further, according to the present invention, the receiving means 10 comprises a receiver and one or a plurality of relay boards as local receivers connected to a transmission path from the receiver. To the terminal 11. Further, the present invention is characterized in that the receiving means 10 comprises only a plurality of relay boards as local receivers connected to each other by a transmission line, and the terminal 11 is connected to each of the relay boards. .

[0010]

According to the disaster prevention monitoring device of the present invention having such a configuration, when a failure occurs in the terminal 11 including the transmission line,
The terminal 11 that has detected the failure performs no-response control on the call from the receiving unit 10 by specifying the address, and when the receiving unit 10 determines that there is no response from the terminal 11, a failure confirmation that checks the type of the failure A command is sent to the terminal 11, the terminal 11 sends a fault signal to the receiving means 10 in response to the fault confirmation command, and the receiving means 10 identifies and displays the type of the fault based on the fault signal, and sends the fault checking command. However, if there is no response again and there is no response even after the predetermined all address polling period has elapsed, the failure of the transmission line is displayed, so even if transient noise is superimposed, the failure due to noise is displayed. Is not displayed, and it is not necessary to take measures against noise, so that the reliability of the device can be improved.

[0011]

FIG. 2 is an explanatory diagram showing an overall configuration according to an embodiment of the present invention. In FIG. 2, reference numeral 10 denotes a receiver, which connects a repeater 14, an analog smoke detector 16, an analog heat sensor 18, and a control repeater 20 as terminals to a transmission line 12 drawn from the receiver 10. I have. A sensor line 22 is drawn from the repeater 14, and an on / off sensor 24 is connected to the sensor line 22. The sensor line 22 is also provided with a transmitter 26 for transmitting a fire signal by a switch operation.

On the other hand, the receiver 10 is provided with a control unit 32 using a CPU.
Operation unit 36, sound unit 3 that outputs an alarm and a voice message
8 and a power supply unit 40. The control unit 32 of the receiver 10 performs polling for collecting terminal information by a call specifying a terminal-side address. In the embodiment shown in FIG. 2, the repeater 1 for the on / off
4. The different terminals of the analog smoke detector 16, the analog heat sensor 18, and the control repeater 20 are connected, but the functions as the repeaters for the call command from the receiver 10 are all the same, and accordingly, When viewed from the receiver 10, a series of terminal addresses are set for each terminal on the transmission path 12, and for example, 127 addresses of addresses 1 to 127 are used.

The control unit 32 of the receiver 10 includes a response determination unit 32A for determining whether or not there is a response from the terminal, and a confirmation command transmission unit for transmitting a confirmation command for confirming the type of the failure to the terminal when there is no response. 32B, a first fault display control means 32C for displaying a fault type when there is a response to a fault signal, and a fault of the transmission line 12 when there is no response again and there is no response after a predetermined polling cycle. It has each function as a second fault display control means 32D for performing display.

That is, the control unit 32 determines a response from the terminal. If there is no response, the control unit 32 sends a failure confirmation command. Is displayed on the display unit 34. On the other hand, if there is no response even after sending the failure confirmation command and there is no response after a predetermined polling period, it is determined that a failure in the transmission line 12 or a failure in the terminal itself has occurred and the display unit 34 Display on.

For example, when there is no response after two polling calls, and when there is no response after a lapse of 7 seconds,
It is determined that a failure in the transmission path 12 or a failure in the terminal itself has occurred. Thereby, it is possible to cope with a failure when the transient noise is superimposed. Next, FIG. 3 is a time chart showing a normal paging operation performed between the receiver 10 of FIG.

In FIG. 3, the receiver 10 sequentially transmits a calling signal including a calling command C1 and terminal addresses A1, A2, A3,. As shown in FIG. 4, this call signal is composed of an 8-bit command field, an 8-bit address field, and a 3-byte 8-bit checksum field. Also,
A start bit, a parity bit, and a stop bit are provided before and after each byte. The command field stores command data indicating what the call signal from the receiver 10 means for each terminal regardless of the address. In the present invention, in addition to command data for a normal call response, for example, a failure confirmation command for confirming the type of failure is set and used.

FIG. 5 shows a transmission format of a response signal from the terminal.
It is composed of two bytes of a bit checksum field, and a start bit, a parity bit, and a stop bit are provided before and after each byte. Of course, the configuration of the transmission format of the paging signal from the receiver and the paging signal from the terminal used in the present invention can be appropriately set as required.

FIG. 6 is a circuit block diagram showing one embodiment of the repeater 14 used in the on / off sensor 24 shown in FIG. In FIG. 6, the repeater 14 is provided with a control circuit 42. CPU 44, R
A memory 46 using AM or the like, and an AD converter 48 are further provided. A transmission / reception circuit 50 and an address setting circuit 54 are provided for the CPU 44 of the control circuit 42.
The transmission / reception circuit 50 receives the calling signal from the receiver 10 in the voltage mode and supplies it to the CPU 44, and sends the response signal from the CPU 44 to the receiver 10 in the current mode. The transmission / reception circuit 50 is provided with a transmission indicator light 52 which is turned on when data bit 1 is transmitted / received and turned off when data bit 0 is transmitted / received.

The address setting circuit 54 is controlled by an address setting switch 56 using a dip switch or the like.
4 is set to a predetermined terminal address. In the address setting by the address setting circuit 54, a group address when a plurality of repeaters 14 are grouped is set in addition to a unique self address. The AD converter 48 provided in the control circuit 42 has a plurality of input ports indicated by numbers 1, 2,... N. As the number of detectors corresponding to the input ports 1 to n of the AD converter 48, for example, the on / off detector 26 and the transmitter 24 can be externally connected. In this embodiment, one transmitter 26 connected last to the on / off sensor 24 is shown, and the on / off sensor 24 is connected to the input ports 1, 2,.
The last transmitter 26 corresponds to the input port n.

The CPU 44 of the control circuit 42 has a function as a non-response means 44A and a failure signal sending means 44B. That is, the CPU 44 includes a non-response unit 44A that does not respond to a call by address designation when a failure is detected, and a failure signal that transmits a failure signal when a confirmation command for confirming the type of the failure is received from the receiver 10. Sending means 44B is provided.

When a fault occurs in a terminal including the transmission line 12, for example, the on / off sensor 24, the repeater 14 that detects the fault does not respond to a call from the receiver 10 by an address. When a failure confirmation command is sent from the receiver 10 due to this non-response, a failure signal indicating the type of the failure is sent to the receiver 10. On the other hand, a signal line terminal S, a sensor line terminal V, an acknowledgment line terminal AA for the transmitter 26, and a common terminal SC are provided on the transmission line 12 side of the repeater 14 with respect to the receiver 10. Therefore, receiver 1
Between 0 and 0, it is connected by 4 lines. Subsequent to the signal line terminal S and the common terminal SC, a diode D2 and a zener diode ZD2 are provided, and a constant voltage circuit 58 is further provided.

The constant voltage circuit 58 outputs a power supply voltage, for example, +3.2 V to the control circuit 42 side. Further, following the sensor line terminal V, a diode D1 and a zener diode ZD1 are provided, and further, a constant voltage circuit 60 is provided. The constant voltage circuit 60 is a power supply voltage required for the externally connected on / off sensor 24 and the transmitter 26, for example, 20.
Output V. Subsequent to the constant voltage circuit 60, a fire disconnection detection circuit 64 and a test circuit 66 are individually provided via a diode D3 corresponding to each of the on / off sensor 24 and the transmitter 26.

The fire disconnection detecting circuit 64 is supplied with a boosted voltage of the boosting circuit 62, for example, 35V. The booster circuit 62 is temporarily operated when the CPU 44 performs data sampling processing, and detects a boosted voltage of 35 V higher than the normal power supply voltage of 20 V to the on / off detector 24 and the transmitter 26 via the fire disconnection detection circuit 64. Applied as operating voltage.

In the on / off sensor 24, a resistor R2 is connected in parallel to a series circuit of the alarm indicator lamp 68 and the resistor R1, and a sensor contact 70 is further connected to this parallel circuit. The sensor contact 70 is constituted by a mechanical switch contact in a diaphragm type heat sensor or a switching means such as a thyristor triggered by a fire detection signal in a smoke sensor, a heat sensor or the like.

A terminal 72 is connected to the terminal of the on / off sensor 24. The terminator 72 connects a zener diode ZD3, a resistor R0, and a zener diode ZD4 in series. The Zener diodes ZD3 and ZD4 are connected to the terminating resistor R0 in the opposite direction so that one of them functions even if the connection polarity is switched. Zener diodes ZD3 and ZD4 are nonconductive at normal output voltage 20V of constant voltage circuit 60 during which data sampling is not performed, and are Zener voltages which become conductive when receiving output voltage of booster circuit 62 performing data sampling, for example, 35V. And

On the other hand, the transmitter 26 corresponding to the input port n of the AD converter 48 has a switch contact 76 which is turned on by a push button operation, a switch contact 78 which closes in conjunction with the switch contact 76, and a terminator 72. The switch contact 76 is connected to the detector line 22 from the fire disconnection detection circuit 64. On the other hand, the signal line from the response confirmation terminal AA of the repeater 14 is drawn in and connected to the switch contact 78 via the confirmation indicator lamp 74 and the resistors R3 and R4.

The fire detecting information is transmitted from the control circuit 42 to the receiver 10 by interruption to the acknowledgment terminal AA of the repeater 14 based on the fire detecting signal of the transmitter 26.
When a receiving operation is performed on the 0 side, a confirmation signal is transmitted to the confirmation response terminal A.
A, and specifically, voltage supply is performed, and thereby the confirmation indicator lamp 74 is turned on. Further, the test circuit 66 provided corresponding to the on / off sensor 24 and the transmitter 26 sequentially operates when a test switch is operated in the receiver 10 or the repeater 14 or a test command is received by a calling signal from the receiver 10. The test can be performed by being activated to short circuit between the sensor lines, creating the same false fire detection condition as when the sensor contact 70 or the transmitter switch contact 76 was activated.

Reference numeral 80 denotes a control voltage monitoring circuit that monitors the voltage boosted by the boosting circuit 62. By monitoring the boosted voltage, it is determined whether a predetermined voltage is supplied from the power supply line of the transmission line 12. I do. If the power supply line is disconnected or short-circuited, no voltage is supplied, so that a failure in the transmission line 12 is determined. . Next, FIG. 7 is a block diagram showing one embodiment of the analog smoke detector 16 shown in FIG.

In FIG. 7, the analog smoke detector 16 includes a sensor main body 16a and a sensor base 16b.
The sensor body 16a is provided with a rectifier circuit 84 for making the connection polarity non-polar from the base side, a noise absorbing circuit 86, and a transmission signal detecting circuit 88. The transmission signal detection circuit 88 detects a paging signal from the receiver 10 in the voltage mode and supplies it to the transmission control circuit 92.

Address information and type information from the address / type setting circuit 94 are set for the transmission control circuit 92. This transmission control circuit 92 has the same function as the control circuit 42 of the repeater 14 shown in FIG. That is, when a failure is detected, a failure signal is sent to the receiver 10 when a failure confirmation command is received from the receiver 10 without responding to the call by the address designation from the receiver 10.

LED detection circuit 96, infrared LED for smoke detection
98, the light receiving circuit 100 and the amplifier circuit 102. Further, a test LED 106 for a test operation is provided. The LED drive circuit 96 receives the data sampling command from the receiver 10 by the transmission control circuit 92, drives the infrared LED to emit light, and converts the smoke detection signal obtained via the light receiving circuit 100 and the amplifier circuit 102 into an AD signal. The data is converted into digital detection data by conversion and stored in the memory. When the transmission control circuit 92 receives a test command from the receiver 10, the test LED 106 is driven to emit light to perform a function test.

That is, the test L is directly applied to the light receiving circuit 100.
The test light from the ED 106 is made incident to make a pseudo fire detection state. At this time, the light receiving circuit 100 and the amplifier circuit 10
If the smoke detection signal obtained through Step 2 is within the specified range, it is determined that the smoke detection signal is normal. Here, there are two types of faults: a false alarm fault when the smoke detection signal falls below the lower limit of the specified range and a false alarm fault when the smoke detection signal falls below the upper limit when the test LED 106 is caused to emit light. More specifically, when the smoke detection signal falls below the lower limit of the specified range, it is a light receiving circuit 100, for example, a dirt on the light receiving LED or a failure of the light receiving circuit 100 itself, resulting in a false alarm for an actual fire. If the detection signal exceeds the upper limit of the specified range, the sensitivity is too high, and a false alarm is likely to occur for a real fire.
Determines the type of these obstacles. The smoke detection structure using the infrared LED 98 and the light receiving circuit 100 is usually performed by a scattered light method.

A response signal from the transmission control circuit 92 is supplied to a response signal output circuit 104, and the receiver 10 is controlled in a current mode.
To send a signal. The transmission circuit 92 and subsequent circuits operate by receiving a constant voltage supply from the constant voltage circuit 90. Furthermore,
An alarm indicator circuit 108 is provided on the sensor base 16b, and turns on an alarm indicator lamp that is exposed to the outside when a fire is detected.

Next, FIG. 8 is a flowchart showing a processing operation by the control unit 32 provided in the receiver 10 of FIG. First, when the power of the receiver 10 is turned on, step S
In step 1, predetermined initialization is performed. Subsequently, the process proceeds to step S2, where the sensor address n for polling is set to the first address n = 1. Then step S
In step 3, polling is performed on the on / off sensor 24 at address n, and a response is waited in step S4.

If there is a response in step S5, step S5
Proceed to 6 to determine whether a fire has occurred. If a fire has not occurred, the process proceeds to step S8. If a fire has occurred, a fire process is performed in step S7. As a fire process, a fire is displayed on the display unit 34, the bell is sounded by the sound unit 38, and the necessary control load 30 is driven.

If the response is a normal signal, step S
At 8, the count is set to Xn = 0. That is, Xn = 0 is set for each address n. Next, proceeding to step S9, it is checked whether or not the sensor maximum address n = 127 has been reached. If not reached, the sensor address n is incremented by one in step S10, and the next step is performed in step S3. The polling for the sensor address n is repeated. If the polling has been reached, the process returns to step S1 to set the sensor address n to n = 1.

If there is no response from the repeater 14 in step S5, the flow advances to step S11 to transmit a failure confirmation command to the repeater 14, and waits for a failure response from the repeater 14 in step S12. Subsequently, at step S13, the repeater 14
It is determined whether or not there is a failure response. If there is no failure response, the process proceeds to step S15, and if there is a failure response, the process proceeds to step S14.

In step S14, a fault signal from the repeater 14 is processed. That is, the type of the failure is determined, and the content is displayed on the display unit 34. Since the address of the repeater 14 can be known, it is preferable to display the address or the district information corresponding to the address, for example, “3F meeting room” together with the content of the failure. The failure signal includes a disconnection signal of the sensor line 22 in the repeater 14, or
It includes a disconnection signal of the acknowledgment line of the transmitter 26 and the like. Also,
The analog smoke detector 16 includes the aforementioned false alarm and false alarm. After processing the failure signal, the process proceeds to step S9, and it is checked whether or not the sensor maximum address n = 127 has been reached.

If there is no failure response from the repeater 14 in step S13, the process proceeds to step S15, where the count number X
It is determined whether or not n has reached a predetermined value Z. As the value of Z, polling for all addresses 127 is performed twice,
The value is set in advance as "1" for two consecutive transmissions, "2" for three consecutive transmissions, and "3" for four consecutive transmissions. Here, it is assumed that Z = 1. When Z = 1, it takes two seconds to perform double feeding, and this takes 7 seconds, which is a time sufficient to determine whether or not a failure is caused by transient noise.

If there is no failure response in step S13,
Since Xn <Z in step S15, step S16
The count number Xn is incremented by 1 to "1". Subsequently, the process proceeds to step S9, in which polling is performed on all addresses n, and after one round, polling is performed on the same address n. During this time, if the fault due to the transient noise has disappeared, there is a normal signal response in step S5, and the count number Xn is set to zero again in step S8.

Thereafter, if there is no response in step S5 even in the second lap and there is no failure response in step S13,
In step S16, Xn (1) = Z (1). In this case, non-response processing is performed in step S17. That is, if there is no response twice and there is no response even after the predetermined polling period, it is determined that a failure has occurred in the transmission line 12 or a failure has occurred in the repeater 14 itself. A predetermined failure is displayed on the display unit 34. As a display mode, for example, "no response failure" is displayed together with the address or the district information corresponding to the address.

Next, FIG. 9 is a flowchart showing the processing operation of the terminal using the repeater 14 used for the on / off sensor shown in FIG. 6 as an example. First, when the power is turned on, predetermined initial settings are performed in step S21,
At 22, the address set by the address setting circuit 54 is checked, and the address is fetched and stored in the memory 46.

Subsequently, the process proceeds to step S23, where it is determined whether or not a fire has occurred. If a fire has occurred, a fire process is performed in step S24. That is, a fire signal is transmitted to the receiver 10. If a fire has not occurred, it is determined in step S25 whether a failure has occurred. If a failure has occurred, the process proceeds to step S26. In step S26, it is determined whether or not polling for the own address has been received. When polling for the own address has been received, a non-response process of not responding is performed in step S27.

Subsequently, the flow advances to step S28 to determine whether or not a failure confirmation command for the own address has been received. If the failure confirmation command is not received, step S
Returning to step 22, the address is checked, and when a failure confirmation command is received, a failure signal indicating the type of the failure that has occurred in step S29 is transmitted to the receiver 10.

As described above, in the receiver 10, the repeater 14
If there is no response twice and no response is received even after a predetermined polling period, it is determined that a failure has occurred in the transmission line 12 or a failure has occurred in the repeater 14 itself, and these are displayed. Therefore, when the transient noise is superimposed, the failure is not displayed. Therefore, it is not necessary to take measures against transient noise, and reliability can be improved. The repeater 14
In the fault detection, a test operation is performed by a test command from the receiver 10 that periodically emits light, and a fault detection process is performed when polling is called.

The processing operation of the analog smoke detector 16 is the same as the flow of the repeater 14. In the embodiment of FIG. 2, the case where only the receiver 10 is provided as the receiving means in the principle explanatory diagram of FIG. 1 is taken as an example, but as another embodiment of the present invention, the receiving means 10 (1) A configuration in which a receiver and a relay board functioning as a local receiver are connected to a transmission path from the receiver, and a terminal is connected to a transmission path from the relay board. (2) Only a relay board as a local receiver is connected. Any of the configurations in which the terminals are connected to the transmission lines from each relay board by connecting through multiple transmission lines can be applied as they are.

[0047]

As described above, according to the present invention, when a failure occurs in a terminal including a signal line, the terminal performs no-response processing for a call from the receiving means, and the receiving means does not respond. If so, a failure confirmation command is sent, the terminal receiving the failure confirmation command returns a failure signal indicating the failure type, the receiving means displays the failure type, and the response is again made after a predetermined polling cycle. If there is no response,
Since the failure of the transmission line is displayed, the failure due to the transient noise is not displayed, and it is not necessary to take measures against the transient noise. As a result, the reliability of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

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

FIG. 3 is a time chart showing polling.

FIG. 4 is an explanatory diagram of a transmission format of a calling signal from a receiver.

FIG. 5 is an explanatory diagram of a transmission format of a response signal from a terminal.

FIG. 6 is a configuration diagram of an embodiment of a repeater used for an on-off sensor.

FIG. 7 is a block diagram showing an embodiment of an analog sensor.

FIG. 8 is a flowchart showing a processing operation on the receiver side.

FIG. 9 is a flowchart showing a processing operation on the repeater side;

[Explanation of symbols]

 10: Receiver (receiving means) 11: Terminal 12: Transmission line 14: Repeater 16: Analog smoke detector 16a: Detector body 16b: Detector base 18: Analog heat detector 20: Control repeater 22: Sensing Device line 24: on / off sensor 26: transmitter 28: control line 30: control load 32: control section 32A: response discriminating means 32B: confirmation command transmitting means 32C: first fault display control means 32D: second fault display control means 34: display unit 36: operation unit 38: sounding unit 40: power supply unit 42: control circuit 44: CPU 44A: non-response unit 44B: failure signal transmission unit 46: memory 48: AD conversion unit 50: transmission / reception circuit 52: transmission display Light 54: Address setting circuit 56: Address setting switch 58, 60: Constant voltage circuit 62: Boost circuit 64: Fire disconnection detection circuit 66: Test Road 68: Alarm indicator lamp 70: Sensor contact 72: Terminator 74: Confirmation indicator lamp 76, 78: Switch contact 80: Control voltage monitoring circuit 84: Rectifier circuit 86: Noise absorption circuit 88: Transmission signal detection circuit 90 : Constant voltage circuit 92: transmission control circuit 94: address / type setting circuit 96: LED drive circuit 98: infrared LED 100: light receiving circuit 102: amplifier circuit 104: response signal output circuit 106: test LED 108: alarm indicator circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-65399 (JP, A) JP-A-4-822795 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G08B 23/00-31/00 G08B 17/00

Claims (7)

(57) [Claims] 1. A disaster prevention monitoring device that collects terminal information by making a call from a receiving unit to a terminal by designating an address, wherein a response determining unit that determines whether the receiving unit has received a response from the terminal. A confirmation command transmitting means for transmitting a confirmation command for confirming a type of a failure to the terminal when there is no response; a first failure display control means for displaying a failure type when a response to a failure signal is received; A second fault display control means for displaying a predetermined fault when a response is received and no response is received even after a predetermined all polling cycle; and the terminal does not respond to a call by address designation when a fault is detected. Response means; and a failure signal transmitting means for transmitting a failure signal when a confirmation command for confirming the type of the failure is received from the receiving means. Monitoring equipment. 2. The disaster prevention monitoring device according to claim 1, wherein the terminal is connected to a repeater connected to a transmission line from the receiving means, and is connected to a line from the repeater to detect an abnormality such as a fire. A disaster prevention monitoring device comprising a relay unit, wherein the repeater is provided with the non-response unit and the failure signal transmission unit for transmitting a failure signal. 3. The disaster prevention monitoring device according to claim 2 , wherein the failure signal includes a disconnection of the transmission line, a disconnection of the line,
Disaster prevention monitoring device characterized by including fault information such as short circuit. 4. The disaster prevention monitoring device according to claim 1 , wherein said terminal is an analog sensor connected to said reception means and provided with said non-response means and failure signal transmission means. apparatus. 5. The disaster prevention monitoring device according to claim 1, wherein said receiving means comprises only a receiver, and said terminal is connected to said receiver. 6. A disaster prevention monitoring system according to claim 1 to 4, wherein said receiving means includes a receiver, and one or more repeater panels as a local receiver connected to the transmission path from the receiver A disaster prevention monitoring device, wherein the terminal is connected to each of the relay boards. 7. The disaster prevention monitoring system according to claim 1 to 4, wherein said receiving means is arranged to each other repeater panels as a plurality of local receivers connected by a transmission path only, said each said repeater panels Disaster prevention monitoring device characterized by connecting a terminal.