JPH11339172A - Disaster preventing monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability by making a monitoring system possible to easily judge whether the environment is one easily generating a communication fault by a noise or not at the time of execution or maintenance/inspection and previously taking measure to remove noises. SOLUTION: A receiver 1 is provided with a fault judging part 24 and a fault count releasing switch 25. At the time of detecting a communication fault in the transmission of a telegraphic message to terminal equipments 4, 7, the fault judging part 24 repeats the transmission of the same message again, and when the number of communication faults exceeds a prescribed frequency threshold, judges the occurrence of a transmission fault. The switch 25 sets up the frequency threshold set up in the judging part 24 to a prescribed value so as to allow the judging part 24 to judge the occurrence of a communication fault by the number of times of communication faults smaller than a normal value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device connected to a transmission line drawn from a receiver or a relay board, a message is transmitted from the receiver to the terminal device, a response message is received, and an abnormality is detected from the response message. The present invention relates to a disaster prevention monitoring system that judges and issues an alarm.

[0002]

2. Description of the Related Art Conventionally, in this kind of disaster prevention monitoring system, for example, an abnormality detection terminal for detecting an abnormality such as a fire detector on a transmission line drawn from a receiver, a smoke prevention device, a district acoustic device, and the like. The control terminal such as is connected, a message including a command such as a terminal address and information collection from the receiver is transmitted to the terminal device, and a message including the sensor detection data is returned.From the received message from the terminal device, An alarm is issued by judging an abnormality such as a fire.

In a receiver, when a message is transmitted to a terminal device, a communication failure is monitored based on, for example, whether or not an acknowledgment is obtained from the terminal. Is retransmitted, and when the number of times of communication failure detection reaches a predetermined threshold number, for example, nine, it is determined that a communication failure has occurred, and a failure display and a failure alarm are issued.

[0004]

In recent years, communication failures due to wireless noise including mobile phones, lightning noise from lightning arresters, and the like have been regarded as a social problem, and have been used for fire monitoring. Even in a disaster prevention monitoring system, a communication failure may impair the centralized monitoring function of the system.

[0005] In this case, if it is found that the communication environment is likely to occur due to radio noise or lightning noise when constructing the system, a noise filter is inserted into the transmission line, or a twisted pair cable or a shielded cable is used in the transmission line. Or change the wiring line of the transmission line. However, even if a communication failure occurs at the time of message transmission by the receiver, if the communication failure is not repeatedly detected for a predetermined threshold number of times, a failure alarm or failure display will not be performed, so during system construction or maintenance and inspection. However, there is a problem that it is difficult to understand that communication failures occur frequently, and it is not possible to take appropriate measures, so that communication failures frequently occur during operation after construction and the system monitoring function is impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and it is possible to easily determine whether or not a system environment in which a communication failure is likely to occur due to noise at the time of construction or maintenance and check in advance. It is an object of the present invention to provide a disaster prevention monitoring system that can ensure reliability by taking measures.

[0007]

In order to achieve this object, the present invention is configured as follows. First, the present invention relates to disaster prevention monitoring in which a terminal device is connected to a transmission line drawn from a receiver, a message is transmitted from the receiver to the terminal device, a response message is received, and an abnormality is determined based on the response message and an alarm is issued. Target the system.

Further, according to the present invention, a plurality of relay boards distributed for disaster prevention monitoring control are connected to a transmission line drawn from a receiver, and a message is transmitted from the receiver to the relay board to receive a response message. Then, the terminal device is connected to the transmission line drawn from each relay panel, a message is transmitted from each relay panel to the terminal device, and the response message is returned. It also covers disaster prevention monitoring systems that determine abnormalities from response messages and transmit them to receivers.

In such a disaster prevention monitoring system according to the present invention, a receiver and / or a relay board are provided with a failure determination unit and a failure count release switch. When a communication failure is detected during transmission of a message to the terminal, the failure determination unit repeats transmission of the same message again, and determines that a transmission failure has occurred when the number of communication failures reaches a predetermined threshold value. The failure count release switch sets the threshold number of times set in the failure determination unit to a predetermined number smaller than the normal time, and causes the failure determination unit to determine a communication failure with the number of communication failures smaller than the normal time.

[0010] The failure determiner counts up the number of communication failures by one when a confirmation message (ACK) is not received from the terminal after transmitting the message. The failure count release switch may be a dedicated switch, but may also serve as a maintenance mode switch used to set the maintenance mode or an accumulation time release switch used to release the accumulation time. According to such a disaster prevention monitoring system of the present invention, at the time of construction or maintenance and inspection, the failure count release switch is operated to determine the communication failure in the failure determination unit to determine the minimum number of threshold times,
For example, by setting it to zero, if a communication failure is detected even once by sending a message, it is immediately judged as a communication failure without retransmitting the message as usual, and a failure alarm and a failure display are issued. Whether the environment is likely to cause a communication failure due to radio noise, lightning noise, or the like can be reliably determined at the stage of construction and maintenance.

For this reason, it is possible to take measures such as inserting a noise filter into a transmission line, using a twisted pair cable or a shielded cable, and changing the wiring system of the transmission line in advance. ,
Reliability can be improved.

[0012]

FIG. 1 is a system configuration diagram of a disaster prevention monitoring system according to the present invention, taking an example of a centralized monitoring system in which a terminal monitors and controls a terminal from a receiver. The receiver 1 is installed in a manager's office or the like, and the terminal transmission line 2 is directed toward the guard area.
The terminal transmission line 2 is divided into a plurality of terminal transmission lines 2a, 2b, 2c and 2d on the terminal side.

Two repeaters 5 and a photoelectric analog spot type sensor 4c are connected to the terminal transmission line 2a, and a heat sensor 4a and a transmitter 4b are connected to the first repeater 5. The next repeater 5 is connected to a gas leak detector 4d. The terminal transmission path 2b connects, for example, two repeaters 5 and a thermal analog spot type sensor 4e. The first repeater 5 is connected to the district sound device 7a. The next repeater 5 is connected with a motor damper 7b and a latch type release 7c for a fire door.

Two repeaters 5 are connected to the terminal transmission line 2c, and a security sensor 8 and an air-conditioning sensor 9 are connected respectively. Further, the addressable transmitter 4 is connected to the terminal transmission line 2d.
f, the heat detector 4a is connected via the photoelectric separation type smoke detector 10 and the repeater 5. The receiver 1 includes a repeater 5, which is a terminal device connected to the terminal transmission path 2, a photoelectric analog spot type sensor 4c, a thermal analog spot type sensor 4e, and an addressable transmitter 4 having a repeater function.
f. A terminal address is set in advance for the photoelectric separation type smoke detector 10. In this embodiment, a maximum of 127 addresses can be set per line of the terminal transmission line 2.

The receiver 1 sequentially transmits a message including a terminal address and a calling command via the terminal transmission line 2 for each repeater address, and collects detection data such as smoke density. When any of the fire detectors detects a fire alarm, the fire sensor transmits, for example, an interrupt signal to the receiver 1. Upon receiving the alarm notification by the interrupt signal, the receiver 1 transmits a search command to the terminal transmission path 2 to determine the sensor that has issued the alarm, searches the terminal, and specifies the alarm detector. Continuously instructs the fire detector that has reported the transmission of fire detection data.

When receiving a fire alarm from the fire detector and the repeater, the receiver 1 sounds the main sound of the fire provided in the receiver 1 and displays the location of the abnormality on the display unit. A display signal is output to the disaster prevention display panel 11 and the annunciator 12 which are connected to the outside via the RS-485 transmission line 6a, and a fire alarm display and an alarm location are displayed.

A CRT device 13 is connected to the receiver 1 via an RS-232C interface transmission line 6b. The CRT device 13 is installed on a console in a management room or the like, and a display provided on the receiver 1 is provided. Various displays for monitoring work equivalent to the section can be made, and a detailed plan view of each guard area can be displayed. Further, the receiver 1 transmits a message including a terminal address and a control command to the repeater 5 connected to the terminal transmission line 2 in conjunction with the sounding of the main sound accompanying the fire alarm, and outputs the message including, for example, the district sound device. Closing is performed by the sound of 7a or the operation of the motor damper 7b, and further, the closing is performed by the releasing operation of the latch type release 7c for fire doors.
Incidentally, the latch type release 7c for fire doors can be automatically unlatched by the alarm of the thermal analog spot type sensor 4e.

Transmission with the terminal device through the terminal transmission line 2 drawn from the receiver 1, and the transmission line 6a for RS-485
The transmission with the disaster prevention display panel 11 connected via the PC is one-to-n communication. On the other hand, communication between the receiver 1 and the CRT device 13 connected to the receiver 1 via the RS-232C transmission line 6b takes the form of one-to-one communication. FIG. 2 shows the receiver 1 of FIG.
FIG. 3 is a circuit block diagram of FIG. The receiver 1 shown in FIG.
A PU 14 is provided and connects the terminal transmission lines 2a and 2b via a terminal transmission unit 15. The terminal transmission lines 2a and 2b are connected to a fire detector 4 and a terminal control device 7 via a repeater 5 having a transmission function. Are connected.

For the receiver MPU 14 of the receiver 1, a display unit 17, a voice synthesizing unit 18, an operation unit 19, a serial transmission unit 20, a parallel transmission unit 21, and a display panel transmission unit 22 are further provided.
And a CRT transmission unit 23 are provided. Receiver MPU
When the detection data from the fire detector 4 by the terminal transmission unit 15 reaches a predetermined caution level, a fire caution display is displayed on the display unit 17 and the voice synthesis unit 18 is activated to sound the caution display main sound. Do. After giving the caution alarm, the receiver M
When a fire alarm is received by the PU 14, a fire alarm display is displayed on the display unit 17 and a sound output of the main fire sound is output from the voice synthesizing unit 18.

Further, as shown in FIG. 1, a monitoring terminal device such as a gas leak detector 4d and a security sensor 8 is connected to the receiver 1 in addition to the fire detector 4, so that a gas leak is generated. Upon receiving the information, the receiver MPU 14 displays a gas leak alarm on the display unit 17 and outputs a sound of the main gas leak from the voice synthesizing unit 18. An abnormal alarm display is displayed on the unit 17 and a sound output of the abnormal main sound is output from the voice synthesizing unit 18.

Further, when a failure occurs in the fire detector 4 or the terminal control device 7, a failure notification is received, an alarm is displayed on the display unit 17 to indicate the occurrence of a failure, and a sounding sound is output. The receiver MPU 14 is provided with a failure determination unit 24. The failure determining unit 24 monitors whether there is a failure in the communication operation between the fire detector 4 and the repeater 5 on the terminal control device 7 side by the terminal transmission unit 15.

When the failure determiner 24 determines a communication failure,
The display unit 17 displays an alarm indicating that a communication failure has occurred, and the voice synthesizing unit 18 outputs the sound of the communication failure sound. When the communication failure is detected by the terminal transmission unit 15 at the time of transmitting a message to the terminal, the failure determination unit 24 determines that a communication failure has occurred. Count up.

When the number of communication failures counted by the error counter reaches a predetermined threshold number A, it is determined that a communication failure has occurred, and the display unit 17 and the voice synthesizing unit 18 display and warn of the communication failure. . The threshold number A of communication failures used for the failure determination by the failure determination unit 24 can be arbitrarily set as needed, and is set to a sufficiently large value, for example, A = 9.

Further, according to the present invention, the receiver MPU 14
A failure count release switch 25 is provided, and by operating the failure count release switch 25, the failure determination unit 24
Is set to a predetermined minimum value, for example, A =
It has a function of setting the value to 0 and causing the failure determination unit 24 to determine that there is a communication failure with a smaller number of communication failures than in the normal case.

Although a dedicated switch may be provided as the failure count release switch 25 for setting the threshold number A of the failure determination unit 24 to 0, the failure count release switch 2
Since the threshold value A of the failure determination unit 25 is set to 0 by the operation of 5 when the disaster prevention monitoring system is installed or the maintenance and inspection is performed, the maintenance using the function of the failure count release switch 25 for setting the maintenance mode is performed. A mode switch or a storage time release switch used to release the storage time used for the fire determination of the receiver may be substituted.

The determination of a communication failure by the failure determination unit 24 provided in the receiver MPU 14 is performed not only by the terminal transmission unit 15 communicating with the fire detector 4 and the terminal control device 7, but also by the display panel transmission unit 22 and CRT transmission. The same applies to transmission by the unit 23. FIG. 3 is a timing chart of a communication failure determination process in the 1: n communication between the fire detector 4 and the terminal control device 7 by the failure determination unit 24 provided in the receiver MPU 14 of FIG.

FIG. 3A shows a failure count release switch 2.
This is a failure determination process when the failure determination unit 24 sets the normal threshold number of times A, for example, A = 9 by turning off the number 5. In FIG. 3A, T1, T2,..., T9 are polling periods. For example, taking the leading polling period T1 as an example, during this period, transmission of a message having a call command and reception of a message from the terminal for 1 to n addresses are performed by designating terminal addresses indicated by numbers 1 to n.

That is, each communication section of the addresses 1 to n is divided into a transmission section in the first half and a reception section in the second half, and a message transmission of (terminal address + call command) is performed in the transmission section, and in the reception section in the second half. A response message (terminal address + data) from the terminal is received. The transmission section and the reception section may be alternately repeated for each polling cycle. In the actual communication operation, to guarantee the communication quality,
For example, a continuous transmission method in which transmission and reception are repeated three times continuously in one communication is performed.

Here, it is assumed that a communication failure occurs continuously in the communication operation of the terminal address 3. Polling cycle T1
In the communication section 26-1 of the terminal address 3, transmission of a message including, for example, a terminal address and a call command is performed in the transmission sections 27 A, 27 B, and 27 as shown in an enlarged manner below.
C, and the receiving sections 28A, 28B, 28C are allocated after each of the transmitting sections 27A to 27C.

In the transmission sections 27A to 27C, the same message is transmitted three times. If any one of the transmission messages can be normally received by the terminal, the terminal responds with an acknowledgment message (ACK). For this reason, a communication message (ACK) can be received from the terminal side in at least one of the three reception sections 28A to 28C even if there is no communication failure or there is a communication failure.

However, in the case of FIG. 3A, in the communication section 26-1 of the terminal address 3, a communication failure due to radio noise, lightning noise, or the like causes a communication message (ACK) from the terminal in any of the reception sections 28A to 28C. Cannot be received, and as a result, the communication in the communication section 26-1 of the terminal address 3 becomes abnormal termination (NG) 30-1.
The error counter N counts up the second communication failure.

Similarly, polling periods T2 to T
9 in any of the communication sections 26-2 to 26-9 of each terminal address, as in the polling section T1, no confirmation message is obtained from the terminal, and thus the ninth abnormal end (N
G) At 30-9, the error counter N becomes N = 9, and when the threshold number of times A used for the determination of the communication failure reaches a predetermined number of 9 = 9, the occurrence 31 of the communication failure is determined and an alarm is displayed.

As described above, when the failure count release switch 25 shown in FIG.
An alarm display of a communication failure is performed only when a communication failure occurs in all of 1 to T9. For example, even if a communication failure occurs considerably due to the influence of radio noise or lightning noise,
This situation cannot be determined when the threshold number A is set to 9 times.

Therefore, at the time of construction and maintenance and inspection, FIG.
By turning on the failure count release switch 25, the threshold number A set in the failure determination unit 24 is set to, for example, A = 0. As described above, when the threshold number A is set to A = 0, as shown in FIG. 3B, the communication period 26 of the terminal address 3 in the first polling period T1 is set.
When the message is transmitted three times in the transmission sections 27A to 27C at −1, a confirmation message (ACK) from the terminal device is not obtained in any of the reception sections 28A to 28C, and abnormal termination (N
G) When 30-1 is reached, a communication failure occurs immediately 3
As a result, the occurrence of a communication failure is displayed as an alarm outside.

For this reason, a situation corresponding to a communication failure that is actually occurring is always displayed as an alarm, and it is assumed that a communication failure is likely to occur due to radio noise, lightning noise or the like during construction or maintenance. Recognize and take countermeasures to reduce communication failures. As measures to reduce this communication failure, there are methods to reduce noise by inserting capacitors and inductance in the transmission line, and methods to use cables that are resistant to noise such as twisted pair cables and shielded cables in the transmission line. . If the communication failure is not reduced even by inserting a capacitor or an inductance or by using a cable that is resistant to noise, measures can be taken to change the wiring line of the transmission line.

Of course, when the construction or maintenance is completed, the preset threshold number A can be returned to nine by returning the failure count release switch 25 to the off state again. In this case, the failure count release switch 25
When the maintenance mode switch and the accumulation time release switch are also used, the operation of releasing the maintenance mode and the operation of releasing the accumulation time release switch can be performed normally without being conscious of restoring the threshold count of the failure determination unit 24. The number can be returned to the number in the communication state, and forgetting to return can be prevented.

FIG. 4 shows a CRT in the receiver 1 of FIG.
5 is a timing chart of a communication failure determination process in one-to-one communication performed with a terminal via a transmission unit 23. FIG.
(A) is a timing chart in the case where the threshold number of times A used for determination of a communication failure in normal time is 9 times, and the same message is transmitted as in the first communication cycle T1 as in the transmission sections 33A to 33C. The transmission is repeated three times, and reception sections 34A to 34C are allocated after each transmission.
In this case, any of the reception sections 3 corresponding to the transmission sections 33A to 33C due to a communication failure such as wireless noise or lightning noise.
If a confirmation message is not obtained from the terminal side even in 4A to 34C, an abnormal end (NG) 35-1 occurs.

When the processing is abnormally terminated, the same message is repeatedly transmitted three times in the next communication cycle T2. Such transmission of the same message is performed by a communication cycle T due to a communication failure.
9 is repeated 9 times, and when abnormal termination (NG) 35-9 is reached, the error counter N detecting a communication failure at this time becomes N = 9, and when the threshold number of times A = 9 is reached, it is determined that the communication failure 36. Then, a communication failure alarm is displayed.

In this case as well, at the time of construction or maintenance and inspection, by turning on the failure count release switch 25 provided in the receiver 1 of FIG. 2, the threshold number A of the failure determination unit 24 becomes A = 0. As a result, as soon as abnormal termination (NG) 35-1 occurs in the first communication cycle T1 as shown in FIG. 4B, the communication failure 36 is determined, and a communication failure alarm can be displayed externally. .

As a result, at the time of construction or maintenance and inspection, an alarm display of a communication failure corresponding to a communication failure that is actually occurring is performed, and the communication installation failure occurs due to radio noise or lightning noise. Appropriate noise countermeasures such as insertion of capacitors and inductance, use of twisted pair cables and shielded cables, and change of wiring lines can be determined appropriately if the environment is susceptible to communication problems. Can take.

FIG. 5 is a flowchart of a communication process performed by the receiver MPU 14 having the function of the fault determination unit 24 in FIG. First, when there is a transmission request in step S1, the process proceeds to step S2, where the error counter N is initialized to N = 0, and then, in step S3, a message transmission process is performed. Subsequently, in step S4, the process waits for an acknowledgment from the terminal. If there is an acknowledgment, the process returns to step S1 to wait for the next transmission request.

If there is no acknowledgment from the terminal in step S4, the error counter N is counted up by one in step S5, and in step S6 it is checked whether or not the maintenance mode switch functioning as, for example, the failure count release switch 25 is on. I do. If the maintenance mode switch is not on, the process proceeds to step S7, and it is checked whether the value of the error counter N is equal to or greater than a predetermined threshold number A.

If the error counter N is less than the threshold number A, the process returns to step S3, and a transmission process is performed to retransmit the same message. The transmission process is repeated without continuously obtaining such a terminal confirmation response. When the error counter N reaches the threshold number A in step S7, the process proceeds to step S8.
Displays communication failure and issues a failure alert. And step S9
Check whether there is an end instruction such as stop of the apparatus, and if there is no end instruction, return to step S1 and wait for the next transmission request.

On the other hand, if the maintenance mode switch has been turned on at the time of construction or at the time of maintenance and inspection, the process proceeds from step S6 to step S8, and a failure display of a communication failure and a failure alarm can be immediately issued. FIG. 6 shows another embodiment of the disaster prevention monitoring system according to the present invention, taking as an example a distributed system in which a plurality of relay boards having a monitoring control function for a receiver are distributed.

In FIG. 6, relay boards 40-1 to 40-99 having addresses No. 1 to No. 99 are connected to the main trunk transmission line 42 drawn from the receiver 38. Each of the relay boards 40-1 to 40-99 has a monitoring control function equivalent to that of the receiver 1 of FIG.
From 40-99, a plurality of transmission lines are respectively drawn.

That is, from the relay board 40-1, the terminal transmission path 2a
Is drawn out, the terminal transmission line 2b is drawn out of the relay board 40-2, and the terminal transmission line 2b is drawn out of the relay board 40-99.
c and 2d are pulled out. These relay boards 40-1,
Terminal transmission line 2a extracted from 40-2, 40-99
The connection of the fire detector and the terminal control device via the terminal-side repeater 5 to .about.2d is the same as in FIG.

Further, from the receiver 38, as in the case of FIG.
The disaster prevention display panel 11 is connected via the RS-485 interface transmission line 6a, and the CRT device 13 is connected via the RS-232C interface transmission line 6b. In addition to the main trunk transmission line 42, a sub trunk transmission line 43 indicated by a broken line is connected to the receiver 38 and the relay boards 40-1 to 40-99 for backup.

Here, the receiver 38 and the relay boards 40-1 to 40-4
The communication mode between 0 and 99 is one-to-n communication. The communication mode between each of the relay boards 40-1 to 40-99 and the terminal side, and the communication mode between the receiver 38, the display panel 11, and the annunciator 12 are also 1: n communication. On the other hand, communication between the receiver 38 and the CRT device 13 is one-to-one communication. The display panel 11 and the annunciator 12 may be connected to the relay boards 40-1 to 40-99 in some cases.

FIG. 7 shows the receiver 38 and the relay board 40 shown in FIG.
FIG. 3 is a circuit block diagram of FIG. The receiver MPU has a receiver 38
54, a failure determination unit 24a according to the present invention is provided, and the threshold count A for determining a communication failure of the failure determination unit 24a by the failure count release switch 25a is changed from A = 9 in the normal state to A = 0. It is set so that an alarm can be displayed in response to an actual communication failure at the time of construction or maintenance.

The main transmission unit 5 is connected to the receiver MPU 54.
The relay board 40 is connected to the main trunk transmission line 42 drawn from the trunk transmission unit 55. For the receiver MPU 54, an operation unit 59, a display unit 57, a voice synthesis unit 58, a parallel transfer unit 60, a serial transfer unit 6
1. A display panel transmission unit 62 and a CRT transmission unit 63 are provided.

The relay panel 40 includes a relay panel MPU 64,
The relay board MPU 64 is provided with a failure determination unit 24b according to the present invention, and performs an alarm display of a communication failure when the number of failures occurring due to a communication failure with the terminal side reaches a predetermined threshold number A. The relay board MPU 64 is provided with a failure count release switch 25b. When the failure count release switch 25b is turned on at the time of construction or maintenance, the threshold number A of the failure determination unit 24B is set to, for example, A = 0. In addition, an alarm display corresponding to an actual communication failure can be displayed.

When the failure count release switch 25a is turned on by the receiver 38, the threshold number A of the failure determination unit 24B of each relay board may be automatically set to A = 0. . Further, when the failure count release switch 25b of the relay board 40 is turned on, the threshold number A of the failure determination unit 52 of the receiver 38 may be automatically set to A = 0.

The terminal transmission unit 6 for the relay board MPU 64
The fire detector 4 is connected to the transmission lines 2a and 2b drawn from the terminal transmission unit 65 via the repeater 5 having a transmission function. The relay panel MPU 64 is provided with a display section 67, an operation section 69, a serial transmission section 70, a parallel transmission section 71, and a display panel transmission section 72.

Each of the fault judging section 24a provided in the receiver 38 and the fault judging section 24b provided in the relay board 40 is connected to the fire detector 4 and the terminal control device 7 in one-to-n communication. This is a communication failure determination process as shown in FIG. Transmission between the display panel transmission units 62 and 72 and the display panel 11 is also 1: n.
This is communication and is a determination process as shown in FIG. In the receiver 38, the one-to-one communication in which the terminal side is connected via the CRT transmission unit 63 is the same communication failure determination processing as the timing chart of FIG.

In the above-described embodiment, the case where the threshold number A used for the determination of the communication failure at the normal time is A = 9 is taken as an example. However, the threshold number A is appropriately determined as needed. be able to. Also, when the failure count release switch is operated, the threshold count A is set to A = 0,
In addition to this, the case where the number is changed to a number smaller than the normal number such as A = 1 is also included.

Further, the communication failure determination of the present invention takes a continuous transmission method in which the same message is transmitted, for example, three times at a time as shown in FIGS. 3 and 4 as an example. It can be determined as appropriate, and is not limited to a specific algorithm.

[0057]

As described above, according to the present invention, the threshold count used for determining a communication failure by operating the failure count release switch at the time of system construction or maintenance is smaller than the normal number, for example, the minimum value. If a communication failure is detected even once, for example, by message transmission, a communication failure alarm is displayed immediately, and it is possible to reliably determine whether or not the system environment is likely to cause a communication failure due to wireless noise or lightning noise. I understand.

For this reason, it is possible to take measures such as insertion of a noise filter into a transmission line, use of a twisted pair cable or shielded cable, and change of a wiring line of a transmission line, thereby minimizing a communication failure occurring during operation. The reliability of the system for monitoring disaster prevention can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a disaster prevention monitoring system of the present invention that performs centralized monitoring control

FIG. 2 is a circuit block diagram of the receiver of FIG. 1;

FIG. 3 is an explanatory diagram of a failure determination process in the 1: n communication of FIG. 1;

FIG. 4 is an explanatory diagram of a failure determination process in the point-to-point communication of FIG. 1;

FIG. 5 is a flowchart of communication processing by the receiver of FIG. 1;

FIG. 6 is a system configuration diagram of the disaster prevention monitoring system of the present invention that performs distributed monitoring control.

FIG. 7 is a circuit block diagram of the receiver and the relay board of FIG. 6;

[Explanation of symbols]

 1, 38: Receiver 2, 2a to 2d: Terminal transmission path 4: Fire detector 4a: Heat detector 4b: Transmitter 4c: Photoelectric analog type spot type detector 4d: Gas leak detector 4e: Thermal analog type spot Type sensor 4f: Addressable transmitter 5: Repeater 6a: Transmission line for RS-485 6b: Transmission line for RS-232C 7: Terminal control device 7a: District sound device 7b: Motor damper 7c: Fire door latch release 8 : Security sensor 9: Air conditioning sensor 10: Photoelectric separation type sensor 11: Disaster prevention display panel 12: Annunciator 13: CTR device 14, 54: Receiver MPU 15, 65: Terminal transmission part 17, 57, 67: Display part 18 , 58: Voice synthesis unit 19, 59, 69: Operation unit 20, 60, 70: Serial transfer unit 21, 61, 71: Parallel transfer unit 22, 62, 72: Display panel transmission units 23, 63: CRT transmission units 24, 24a, 24b: failure determination units 25, 25a, 25b: failure count release switches 40, 40-1 to 40-99: relay boards 42: main trunk transmission lines 43: Sub-trunk transmission line

Claims (4)

[Claims] 1. A terminal device is connected to a transmission line drawn from a receiver, a message is transmitted from the receiver to the terminal device, a response message is received, and an abnormality is determined from the response message and an alarm is issued. In the disaster prevention monitoring system, in the receiver, if a communication failure is detected during transmission of a message to the terminal device, transmission of the same message is repeated again, and the number of times of the communication failure becomes a predetermined threshold number of times. A failure determination unit that determines that a transmission failure has occurred at the time, and sets the threshold number of times set in the failure determination unit to a predetermined count value smaller than a normal value, and sets the failure determination unit to a number of communication failures smaller than the normal time. A disaster prevention monitoring system, comprising: a failure count release switch for determining a communication failure. 2. A plurality of relay boards distributed and arranged for disaster prevention monitoring and control are connected to a transmission line drawn from a receiver,
A message is transmitted from the receiver to the relay board, a response message is received, an abnormality is determined from the response message, an alarm is issued, and a terminal device is connected to a transmission line drawn from each of the relay boards. In a disaster prevention monitoring system that transmits a message from the board to the terminal device and returns a response message, determines an abnormality from the response message and sends the message to the receiver, the receiver and the relay panel each include: If a communication failure is detected during transmission of a message to the terminal, the transmission of the same message is repeated again, and a failure determination unit that determines that a transmission failure has occurred when the number of times of the communication failure has reached a predetermined threshold number, A failure count release switch for setting the threshold number of times set in the failure determination unit to a predetermined number of times smaller than usual and causing the failure determination unit to determine a communication failure with the number of communication failures less than normal time; Was Disaster prevention monitoring system, wherein the door. 3. The disaster prevention monitoring system according to claim 1, wherein the failure determination unit counts one communication failure when a confirmation message is not received from a terminal after transmitting the message. Disaster prevention monitoring system characterized by being up. 4. The disaster prevention monitoring system according to claim 1, wherein the failure count release switch is a maintenance mode switch used for setting a maintenance mode or a storage time release switch used for releasing a storage time. Disaster prevention monitoring system characterized by the following.