Disaster prevention system

Abstract

To shorten a time to be required in testing a plurality of terminal apparatuses.SOLUTION: A disaster prevention system 10 includes a plurality of fire detectors 300 and a disaster prevention reception board 100. The disaster prevention reception board 100 instructs a start of a test to the plurality of fire detectors 300 so as to allow a period from a time point to start the test to a time point to end the test in each of the fire detectors 300 to overlap with the period of other fire detectors 300. The plurality of fire detectors 300 start the test in accordance with the instruction of the disaster prevention reception board 100.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a disaster prevention system.

Background Art

[0002] There is a technique for testing a plurality of fire detectors (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the tests of a plurality of terminal devices such as a plurality of fire detectors connected to a disaster prevention control panel are sequentially performed one by one under the control of the disaster prevention control panel, it takes time to test the terminal devices.

[0005] One object of the present invention is to shorten the time required for testing a plurality of terminal devices.

Means for Solving the Problems

[0006] One aspect of the present invention is a disaster prevention system including a plurality of terminal devices and a disaster prevention control panel, wherein the disaster prevention control panel instructs the plurality of terminal devices to start the test so that a period from a time point when the test is started to a time point when the test ends in each terminal device overlaps with the period of other terminal devices, and the plurality of terminal devices start the test according to the instruction of the disaster prevention control panel.

[0007] The disaster prevention control panel may instruct the start of the test so that the tests of the plurality of terminal devices are started simultaneously.

[0008] The disaster prevention control panel may instruct the start of the test so that the tests of the plurality of terminal devices are started at different timings.

[0009] The plurality of terminal devices emit light in the test, and the disaster prevention control panel may instruct the start of the test so that the light emission periods of the plurality of terminal devices do not overlap.

[0010] The plurality of terminal devices are divided into a plurality of groups, and the disaster prevention control panel may instruct the start of the test so that the periods of at least two terminal devices included in the same group overlap.

[0011] The plurality of terminal devices may be divided into the plurality of groups such that terminal devices with different power supply systems are included in the same group.

[0012] The plurality of terminal devices may be divided into the plurality of groups such that the number of configured devices decreases as the distance from the power supply increases in order from the one closer to the power supply that supplies power to the plurality of terminal devices.

[0013] The plurality of terminal devices may be divided into the plurality of groups such that adjacent terminal devices are not included in the same group.

Advantages of the Invention

[0014] According to the present invention, the time required for testing a plurality of terminal devices is shortened.

Brief Description of the Drawings

[0015]

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Modes for Carrying Out the Invention

[0016] 1. First Embodiment FIG. 1 is a diagram showing an example of a disaster prevention system 10 according to the first embodiment. The disaster prevention system 10 is a system for quickly detecting a fire and minimizing damage caused by the fire. The disaster prevention system 10 is installed, for example, in a tunnel. The disaster prevention system 10 includes a disaster prevention receiver 100, relay amplifiers 200A, 200B, 200C (hereinafter also collectively referred to as "relay amplifier 200"), and a plurality of fire detectors 300. Note that in FIG. 1, only the configuration related to the test of the fire detector 300 is mainly shown, and other configurations are omitted. Also, the number of relay amplifiers 200 is not limited to the example shown in FIG. 1. The number of relay amplifiers 200 may be less than 3 or more than 3.

[0017] The disaster prevention receiver 100 is provided, for example, in the electrical room of the tunnel. The plurality of relay amplifiers 200 are provided, for example, at predetermined intervals, for example, at 800 m intervals, in the tunnel. The plurality of fire detectors 300 are provided, for example, at predetermined intervals, for example, at 25 m to 50 m intervals, in the tunnel. The installation interval of the plurality of fire detectors 300 is smaller than the installation interval of the plurality of relay amplifiers 200.

[0018] The disaster prevention receiver 100, the plurality of relay amplifiers 200, and the plurality of fire detectors 300 are connected via a signal line 400 and a power line 401. More specifically, the disaster prevention receiver 100 is connected to one end of the signal line 400 and the power line 401. The relay amplifier 200C is connected to the other end of the signal line 400 and the power line 401. Between the disaster prevention receiver 100 and the relay amplifier 200C, the relay amplifiers 200A and 200B are connected in order from the side closer to the disaster prevention receiver 100. A plurality of fire detectors 300 are connected between the disaster prevention receiver 100 and the relay amplifier 200A. A plurality of fire detectors 300 are connected between the relay amplifiers 200A and 200B and between the relay amplifiers 200B and 200C, respectively.

[0019] The disaster prevention receiver 100 is provided with a power supply 101. The power supply 101 supplies power to a plurality of fire detectors 300 connected between the disaster prevention receiver 100 and the relay amplifier panel 200A. The fire detectors 300 powered by the power supply 101 belong to the first power supply system.

[0020] The relay amplifier panels 200A and 200B are each provided with a power supply 201A and 201B respectively. The power supply 201A supplies power to a plurality of fire detectors 300 connected between the relay amplifier panel 200A and the relay amplifier panel 200B. The fire detectors 300 powered by the power supply 201A belong to the second power supply system. The power supply 201B supplies power to a plurality of fire detectors 300 connected between the relay amplifier panel 200B and the relay amplifier panel 200C. The fire detectors 300 powered by the power supply 201B belong to the third power supply system.

[0021] <Disaster prevention receiver 100> The disaster prevention receiver 100 is a device that receives signals from terminal devices connected to the disaster prevention receiver 100 and controls the terminal devices. Also, the disaster prevention receiver 100 controls the timing at which each fire detector 300 starts a test so that tests of a plurality of fire detectors 300 are performed in parallel. The disaster prevention receiver 100 is an example of the "disaster prevention control panel" according to the present invention.

[0022] FIG. 2 is a diagram showing an example of the configuration of the disaster prevention receiver 100. The disaster prevention receiver 100 includes a control unit 111, a storage unit 112, and a communication unit 113 in addition to the power supply 101 shown in FIG. 1. In FIG. 2, the illustration of the power supply 101 is omitted.

[0023] The control unit 111, also called a processor, controls each part of the disaster prevention receiver 100 and performs various processes. The control unit 111 includes, for example, a CPU (Central Processing Unit). The storage unit 112, also called a memory, stores various data and programs. The storage unit 112 includes at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). The storage unit 112 stores a program for realizing the functions of the disaster prevention receiver 100 and a group table 123. The communication unit 113 is a communication interface for connecting the disaster prevention receiver 100 to the signal line 400. The communication unit 113 is used to communicate with other devices connected via the signal line 400.

[0024] The control unit 111 functions as a generation means 121 and an instruction means 122. These functions are realized by the control unit 111 executing the program stored in the storage unit 112, causing the control unit 111 to perform calculations or control each part of the disaster prevention receiver 100.

[0025] The generation means 121 generates a plurality of groups by dividing a plurality of fire detectors 300 into a plurality of groups. For example, the storage unit 112 stores configuration information indicating the configuration of the disaster prevention system 10 in advance. This configuration information includes, for example, information indicating the identifier and installation location of each fire detector 300. The generation means 121 performs grouping based on this configuration information.

[0026] The indicating means 122 instructs the start of the test for these fire detectors 300 such that the periods (hereinafter referred to as "test execution periods") for executing the tests of at least two fire detectors 300 included in each group generated by the generating means 121 overlap. This test execution period refers to the period from the time when the test starts to the time when the test ends in each fire detector 300. The test execution periods of the plurality of fire detectors 300 may all overlap, or only a part of them may overlap.

[0027] <Relay amplifier panel 200> The relay amplifier panel 200 is a device that relays and amplifies signals exchanged between the disaster prevention receiving panel 100 and the fire detector 300. Among the relay amplifier panels 200 shown in FIG. 1, the relay amplifier panel 200C connected to one end of the signal line 400 serves as a terminator.

[0028] <Fire detector 300> The fire detector 300 detects a fire and transmits a fire signal to the disaster prevention receiving panel 100. For example, the fire detector 300 detects a flame using a detection principle called two-wavelength flickering. However, the method by which the fire detector 300 detects a fire is not limited to the two-wavelength flickering method, and other methods may be used. Also, the fire detector 300 conducts a test to confirm whether the fire detector 300 operates normally under the control of the disaster prevention receiving panel 100. This test includes a function test and a contamination test. The function test is a test to confirm whether the fire detection functions normally. The contamination test is a test to confirm the contamination state of the light receiving window 301. The time required for the test of the fire detector 300 is approximately 15 to 20 seconds per unit. The fire detector 300 is an example of the "terminal device" according to the present invention.

[0029] FIG. 3 is a diagram showing an example of the configuration of the fire detector 300. The fire detector 300 includes a control unit 311, a storage unit 312, a communication unit 313, a first fire detection unit 314, a second fire detection unit 315, a first light emitting unit 316, and a second light emitting unit 317. In FIG. 3, mainly only the configuration related to the test of the fire detector 300 is shown, and other configurations are omitted.

[0030] The control unit 311, the memory unit 312, and the communication unit 313 are basically the same as the control unit 111, the memory unit 112, and the communication unit 113 described above. However, a program for realizing the function of the fire detector 300 is stored in the memory unit 312. The communication unit 313 is a communication interface for connecting the fire detector 300 to the signal line 400. The communication unit 313 is used to communicate with other devices connected via the signal line 400.

[0031] The first fire detection unit 314 monitors the monitoring area on the right side towards the fire detector 300. The first fire detection unit 314 includes a light receiving unit 318a used for detecting flames. The second fire detection unit 315 monitors the monitoring area on the left side towards the fire detector 300. The second fire detection unit 315 includes a light receiving unit 318b used for detecting flames. Thus, the fire detector 300 monitors the left and right spaces of the fire detector 300 separately by the first fire detection unit 314 and the second fire detection unit 315. Also, as shown in FIG. 1, a light receiving window 301 having light transmissibility is provided on the housing of the fire detector 300. The light receiving units 318a and 318b receive fire light through the light receiving window 301. In the following description, when the light receiving units 318a and 318b are collectively referred to, they are called "light receiving unit 318".

[0032] The first light emitting unit 316 emits light during the function test. The first light emitting unit 316 irradiates the light receiving unit 318 with test light. Note that two first light emitting units 316 may be provided, one irradiating the light receiving unit 318a of the first fire detection unit 314 with test light and the other irradiating the light receiving unit 318b with test light. The second light emitting unit 317 emits light during the contamination test. The second light emitting unit 317 irradiates the light receiving unit 318 with test light through the light receiving window 301. The light receiving unit 318 receives the test light irradiated through the light receiving window 301 from the second light emitting unit 317 during the contamination test. In the example shown in FIG. 3, the light receiving unit 318 is also used for the contamination test, but a light receiving unit for the contamination test may be provided separately from the light receiving unit 318. The current consumption is higher during the period when the first light emitting unit 316 or the second light emitting unit 317 is emitting light than during the period when the first light emitting unit 316 and the second light emitting unit 317 are not emitting light.

[0033] The control unit 311 functions as a first test means 321, a second test means 322, and a transmission means 323. These functions are realized by the control unit 311 executing a program stored in the storage unit 312, performing calculations by the control unit 311, or controlling each part of the fire detector 300.

[0034] The first test means 321 performs a function test under the control of the disaster prevention receiving board 100. For example, the first test means 321 starts a function test according to an instruction from the disaster prevention receiving board 100 and causes the first light emitting unit 316 to emit light. The first test means 321 determines whether fire detection functions normally based on the light reception status of the test light in the first fire detection unit 314 and the second fire detection unit 315.

[0035] After the function test is performed, the second test means 322 performs a contamination test. For example, after the light emission of the function test ends, the second test means 322 causes the second light emitting unit 317 to emit light. The second test means 322 determines the contamination state of the light receiving window 301 according to the light reduction rate from the reference value of the light reception amount of the test light received by the light receiving unit 318 through the light receiving window 301. As this reference value, for example, the light reception amount of the test light received by the light receiving unit 318 through the light receiving window 301 when the light receiving window 301 is not contaminated is used.

[0036] The transmission means 323 transmits the test results of the function test and the contamination test to the disaster prevention receiving board 100.

[0037] <Grouping> In the initial setting, for example, the disaster prevention receiving board 100 generates a plurality of groups by dividing a plurality of fire detectors 300 into a plurality of groups, and stores the information of these groups in the group table 123. As methods for generating groups, for example, there are the following first method to fourth method.

[0038] The first method is a method of grouping a plurality of fire detectors 300 in a predetermined number. The predetermined number is determined, for example, as a number such that the current consumption when emitting light simultaneously is equal to or less than the allowable current of the system. The allowable current of this system is determined in advance in consideration of factors including the power supply capacity of the power supplies 101, 201A, or 201B, for example. Here, it is assumed that the predetermined number is 16. For example, in the disaster prevention system 10 shown in FIG. 1, a plurality of fire detectors 300 are grouped in groups of 16 in order from the one closer to the disaster prevention receiver 100. As a result, a plurality of groups each including 16 fire detectors 300 are generated.

[0039] The second method is a method of grouping such that fire detectors 300 with different power supply systems are included in the same group. In other words, in the second method, fire detectors 300 with the same power supply system are grouped so as not to be included in the same group. For example, in the disaster prevention system 10 shown in FIG. 1, a fire detector 300 belonging to the first power supply system, a fire detector 300 belonging to the second power supply system, and a fire detector 300 belonging to the third power supply system are each selected and grouped. As a result, a plurality of groups each including one fire detector 300 belonging to the first power supply system, one fire detector 300 belonging to the second power supply system, and one fire detector 300 belonging to the third power supply system are generated.

[0040] The third method is a method of grouping the fire detectors 300 in order from the closest one to the power supplies 101, 201A, or 201B that supply power to each fire detector 300, and grouping them so that the number of fire detectors 300 included in each group decreases as the distance from the power supplies 101, 201A, or 201B increases. As the distance from the power supplies 101, 201A, or 201B increases, the voltage drop due to the line resistance increases, so the voltage applied to the fire detector 300 decreases, and thus the number of fire detectors 300 that can be tested in parallel is limited. Therefore, as the distance from the power supplies 101, 201A, or 201B that supply power to each fire detector 300 to that fire detector 300 increases, the number of fire detectors 300 included in the same group decreases. The number of fire detectors 300 included in each group is determined by, for example, the voltage after the voltage drop, which is the number of fire detectors 300 that can be tested in parallel.

[0041] FIG. 4 is a diagram showing an example of a third method of grouping a plurality of fire detectors 300. In the example shown in FIG. 4, first, for a plurality of fire detectors 300 belonging to the first power supply system, 16 fire detectors 300 are grouped in ascending order of the distance from the power supply 101, and a first group is generated. This first group includes 16 fire detectors 300. Subsequently, excluding the fire detectors 300 included in the first group, 14 fire detectors 300 are grouped in ascending order of the distance from the power supply 101, and a second group is generated. The second group includes 14 fire detectors 300. Subsequently, excluding the fire detectors 300 included in the first group and the second group, 12 fire detectors 300 are grouped in ascending order of the distance from the power supply 101, and a third group is generated. The third group includes 12 fire detectors 300. In this way, as the distance from the power supply 101 increases, the number of fire detectors 300 included in the group decreases. Similarly, for the fire detectors 300 belonging to the second power supply system and the fire detectors 300 belonging to the third power supply system, they are grouped so that the number of fire detectors 300 included in the group decreases as the distance from the power supplies 201A and 201B increases, in ascending order of the distance from the power supplies 201A and 201B.

[0042] The fourth method is a method of grouping such that adjacent fire detectors 300 are not included in the same group. In other words, in the fourth method, the fire detectors 300 that are not adjacent to each other are grouped such that they are included in the same group.

[0043] During the test of the fire detector 300, the fire detector 300 does not monitor for a fire. However, a plurality of fire detectors 300 perform dual monitoring in which adjacent fire detectors 300 monitor the same monitoring area. Therefore, if the fire detectors 300 are grouped such that adjacent fire detectors 300 are not included in the same group, even if the tests of the fire detectors 300 in the same group are performed in parallel, there will be no unmonitored area where the fire is not monitored during the test.

[0044] FIG. 5 is a diagram showing an example of the monitoring areas of a plurality of fire detectors 300. In this example, the plurality of fire detectors 300 include fire detectors 300H to 300J. Here, regarding the configurations of the fire detectors 300H, 300I, and 300J, they will be described by attaching "H", "I", and "J" to the end of the reference numerals, respectively. In the example shown in FIG. 5, the monitoring area 501 is monitored by both the first fire detection unit 314H of the fire detector 300H and the second fire detection unit 315I of the fire detector 300I. Therefore, even if the test of the fire detector 300H is performed and the monitoring by the first fire detection unit 314H is interrupted, if the test of the fire detector 300I is not performed, the monitoring of the monitoring area 501 by the second fire detection unit 315I of the fire detector 300I will continue. Similarly, the monitoring area 502 is monitored by both the first fire detection unit 314I of the fire detector 300I and the second fire detection unit 315J of the fire detector 300J. Therefore, even if the test of the fire detector 300I is performed and the monitoring by the first fire detection unit 314I is interrupted, if the test of the fire detector 300J is not performed, the monitoring of the monitoring area 502 by the second fire detection unit 315J of the fire detector 300J will continue.

[0045] In the example shown in FIG. 5, since the fire detectors 300H and 300I are adjacent to each other, they are grouped so as not to be included in the same group. Similarly, since the fire detectors 300I and 300J are adjacent to each other, they are grouped so as not to be included in the same group. For example, they are numbered in ascending order from the disaster prevention receiving board 100, and the odd-numbered fire detectors 300 are grouped to generate the first group. Subsequently, the even-numbered fire detectors 300 are grouped to generate the second group. By grouping in this way, adjacent fire detectors 300 are not included in the same group. Also, as another method, a plurality of groups may be generated by grouping every predetermined number of fire detectors in ascending order from the disaster prevention receiving board 100. For example, when the predetermined number is 10, when numbered in ascending order from the disaster prevention receiving board 100, first, the first fire detector 300, the 11th fire detector 300, the 21st fire detector 300, ··· are grouped to generate the first group. Subsequently, the second fire detector 300, the 12th fire detector 300, the 22nd fire detector 300, ··· are grouped to generate the second group. Even when grouped in this way, adjacent fire detectors 300 are not included in the same group.

[0046] FIG. 6 is a diagram showing an example of the group table 123 according to the first embodiment. The group table 123 includes a group ID and a terminal ID. The group ID is an identifier that uniquely identifies a group. The terminal ID is an identifier that uniquely identifies the fire detector 300. Each group ID is associated with the terminal IDs of the fire detectors 300 included in that group. In the example shown in FIG. 6, the group with the group ID of "001" includes the fire detectors 300A to 300C.

[0047] <Operation> FIG. 7 is a sequence chart showing an example of the operation of the disaster prevention system 10 according to the first embodiment. In step S11 of this operation, the instruction means 122 of the disaster prevention receiver 100 transmits a test start signal for instructing the start of a test to each fire detector 300, for example, in response to an operation by a maintenance worker. When the fire detector 300 receives the test start signal from the disaster prevention receiver 100, the fire detector 300 shifts to the test mode, and the test of the fire detector 300 is started. In step S12, the first test means 321 of the fire detector 300 causes the first light emitting unit 316 to emit light (hereinafter referred to as "first light emission"). By this first light emission, the light receiving unit 318 is irradiated with test light from the first light emitting unit 316. In step S13, after the first light emission ends, the second test means 322 of the fire detector 300 causes the second light emitting unit 317 to emit light (hereinafter referred to as "second light emission"). By this second light emission, the light receiving unit 318 is irradiated with test light from the second light emitting unit 317 through the light receiving window 301.

[0048] In step S14, the first test means 321 and the second test means 322 of the fire detector 300 respectively determine the results of the function test and the contamination test. For example, the first test means 321 determines that the fire detection functions normally when the amount of test light received by the light receiving unit 318 from the first light emitting unit 316 is greater than the threshold value. On the other hand, the first test means 321 determines that the fire detection does not function normally when the amount of test light received by the first fire detection unit 314 and the second fire detection unit 315 from the first light emitting unit 316 is less than or equal to the threshold value. Note that the case where the amount of test light received is less than or equal to the threshold value includes the case where the test light is not detected by the light receiving unit 318. Also, for example, the second test means 322 determines that the light receiving window 301 is not contaminated when the light reduction rate from the reference value of the amount of test light received by the light receiving unit 318 from the second light emitting unit 317 through the light receiving window 301 is less than or equal to a predetermined value. On the other hand, the second test means 322 determines that the light receiving window 301 is contaminated when the light reduction rate from the reference value of the amount of test light received by the light receiving unit 318 from the second light emitting unit 317 through the light receiving window 301 is greater than the predetermined value.

[0049] In step S15, the transmitting means 323 of the fire detector 300 transmits a test end signal indicating that the test has ended and the test result determined in step S14 to the disaster prevention receiving panel 100. This test result includes the result of the function test and the result of the contamination test. When the test end signal and the test result are transmitted, the fire detector 300 shifts from the test mode to the normal monitoring mode, and the test of the fire detector 300 ends.

[0050] The process shown in FIG. 7 is performed in order for each group. When the process shown in FIG. 7 is completed for all the fire detectors 300 included in the first group, the process shown in FIG. 7 is performed for the fire detectors 300 included in the next group. In this way, the process shown in FIG. 7 is repeated until the process is completed for all groups.

[0051] In the above-described step S11, the instructing means 122 of the disaster prevention receiving panel 100 transmits a test start signal to each fire detector 300 so that the tests of the plurality of fire detectors 300 included in the same group are performed in parallel. There are several examples of the timing for instructing the start of the test.

[0052] <Test start timing> FIG. 8 is a timing chart showing an example of the timing for instructing the start of the test. In the example shown in FIG. 8, the start of the test of the fire detectors 300 is instructed so that the tests of all the fire detectors 300 included in the same group are started simultaneously. Here, the term "simultaneously" does not necessarily mean completely at the same time, and there may be some deviation. Here, as shown in FIG. 6, it is assumed that the group with the group ID "001" includes the fire detectors 300A to 300C.

[0053] At time t1 in FIG. 8, a test start signal is transmitted from the disaster prevention receiver 100 to each of the fire detectors 300A to 300C. At time t2, the light emission of each first light emitting unit 316 of the fire detectors 300A to 300C starts. At time t3, the light emission of each first light emitting unit 316 of the fire detectors 300A to 300C ends. In this way, the fire detectors 300A to 300C perform first light emission simultaneously. Next, at time t4, the light emission of each second light emitting unit 317 of the fire detectors 300A to 300C starts. At time t5, the light emission of each second light emitting unit 317 of the fire detectors 300A to 300C ends. In this way, the fire detectors 300A to 300C perform second light emission simultaneously. Next, at time t6, a test end signal and test results are transmitted from the fire detector 300 to the disaster prevention receiver 100. The period from time t1 to t6 described above is the test execution period TA to TC of the fire detectors 300A to 300C. The test execution periods TA to TC all overlap.

[0054] In the example shown in FIG. 8, any of the first to fourth methods described above may be adopted as the grouping method. For example, when the second method described above is adopted and the fire detectors 300 with different power supply systems are grouped so as to be included in the same group, since all the fire detectors 300 included in the same group have different power supply systems, these fire detectors 300 can emit light simultaneously. Or, when the third method described above is adopted and the fire detectors 300 are grouped so that the number of configured units decreases as the distance from the power supply 101, 201A, or 201B that supplies power to each fire detector 300 increases, starting from the closer one to the power supply 101, 201A, or 201B, even if the voltage drop increases as the distance from the power supply 101, 201A, or 201B increases, each group includes only the number of fire detectors 300 that can emit light simultaneously with the voltage after the voltage drop. Therefore, all the fire detectors 300 included in the same group can emit light simultaneously.

[0055] FIG. 9 is a timing chart showing another example of the timing for instructing the start of a test. In the example shown in FIG. 9, the tests of all the fire detectors 300 included in the same group are started at different timings, and the start of the test is instructed such that the light emission periods of at least two of these fire detectors 300 overlap. Here, as shown in FIG. 6, it is assumed that the group with the group ID of "001" includes the fire detectors 300A to 300C.

[0056] At time t11 in FIG. 9, a test start signal is transmitted from the disaster prevention receiving panel 100 to the first fire detector 300A. At time t12, a test start signal is transmitted from the disaster prevention receiving panel 100 to the next fire detector 300B. The length of the period from time t11 to t12 is shorter than the length of the test execution period TA of the fire detector 300A. Here, time t12 is set to a time such that the light emission period TA1 of the fire detector 300A and the light emission period TB1 of the fire detector 300B partially overlap. Each fire detector 300 is configured to perform first light emission and second light emission for the same length of light emission period after a predetermined time has elapsed since receiving the test start signal. Therefore, time t12 can be obtained by back-calculating based on time t11 and the length of the light emission period. For example, when the length of the light emission period of each fire detector 300 is 2 seconds, if the test start signal is transmitted at a time less than 2 seconds from time t11, the light emission period TA1 of the fire detector 300A and the light emission period TB1 of the fire detector 300B partially overlap. Therefore, time t12 is a time after time t11 and is set to a time less than 2 seconds from time t11.

[0057] At time t13, a test start signal is transmitted from the disaster prevention receiving panel 100 to the next fire detector 300C. The length of the period from time t12 to t13 is shorter than the length of the test execution period TB of the fire detector 300B. Time t13 is also set to a time such that the light emission period TB1 of the fire detector 300B and the light emission period TC1 of the fire detector 300C partially overlap, similar to time t12.

[0058] At time t14, the light emission of the first light emitting unit 316 of the fire detector 300A starts. At time t16, the light emission of the first light emitting unit 316 of the fire detector 300A ends. The period from time t14 to t16 is the light emission period TA1 of the first light emission of the fire detector 300A.

[0059] At time t15 before time t16, the light emission of the first light emitting unit 316 of the fire detector 300B starts. At time t18 after time t16, the light emission of the first light emitting unit 316 of the fire detector 300B ends. The period from time t15 to t18 is the light emission period TB1 of the first light emission of the fire detector 300B.

[0060] At time t17 before time t18, the light emission of the first light emitting unit 316 of the fire detector 300C starts. At time t19 after time t18, the light emission of the first light emitting unit 316 of the fire detector 300C ends. The period from time t17 to t19 is the light emission period TC1 of the first light emission of the fire detector 300C.

[0061] As shown in FIG. 9, the light emission period TA1 of the first light emission of the fire detector 300A and the light emission period TB1 of the first light emission of the fire detector 300B partially overlap. Also, the light emission period TB1 of the first light emission of the fire detector 300B and the light emission period TC1 of the first light emission of the fire detector 300C partially overlap.

[0062] Regarding the second light emission, similar to the first light emission, the light emission period TA2 of the second light emission of the fire detector 300A and the light emission period TB2 of the second light emission of the fire detector 300B partially overlap. The light emission period TB2 of the second light emission of the fire detector 300B and the light emission period TC2 of the second light emission of the fire detector 300C partially overlap.

[0063] At time t20, a test end signal and test results are transmitted from the fire detector 300A to the disaster prevention receiving panel 100. The period from time t11 to t20 is the test execution period TA of the fire detector 300A. Next, at time t21, a test end signal and test results are transmitted from the fire detector 300B to the disaster prevention receiving panel 100. The period from time t12 to t21 is the test execution period TB of the fire detector 300B. Next, at time t22, the disaster prevention receiving panel 100 transmits a test end signal and test results from the fire detector 300C. The period from time t13 to t22 is the test execution period TC of the fire detector 300C. The test execution periods TA to TC partially overlap. In other words, the test execution periods TA to TC are shifted by shorter times than the lengths of the test execution periods TA to TC.

[0064] In the example shown in FIG. 9, any of the first to fourth methods described above may be adopted as the grouping method. For example, when the first method described above is adopted and grouping is performed for each predetermined number of units, even when the number of fire detectors 300 that can emit light simultaneously is limited by the allowable current of the system, only the light emission periods of the limited number of fire detectors 300 among the plurality of fire detectors 300 included in the same group can overlap, so that an excess of the allowable current of the system is prevented. In addition, when the example shown in FIG. 8 is adopted, more fire detectors 300 than the number of fire detectors 300 that can be included in one group can be included in one group.

[0065] FIG. 10 is a timing chart showing another example of the timing for instructing the start of a test. In the example shown in FIG. 10, the tests of all the fire detectors 300 included in the same group are started at different timings, and the start of the test is instructed so that the light emission periods of these fire detectors 300 do not overlap. Here, as shown in FIG. 6, it is assumed that the group with the group ID "001" includes the fire detectors 300A to 300C.

[0066] At time t31 in FIG. 10, a test start signal is transmitted from the disaster prevention receiver 100 to the first fire detector 300A. At time t32, a test start signal is transmitted from the disaster prevention receiver 100 to the next fire detector 300B. The length of the period from time t31 to t32 is shorter than the length of the test execution period TA of the fire detector 300A. Here, time t32 is set to a time such that the light emission period TA1 of the first light emission and the light emission period TA2 of the second light emission of the fire detector 300A do not overlap with the light emission period TB1 of the first light emission of the fire detector 300B. As described above, each fire detector 300 is configured to perform the first light emission and the second light emission for a light emission period of the same length after a predetermined time has elapsed since receiving the test start signal. Therefore, time t32 can be obtained by back-calculating based on time t31, the length of the light emission period, and the time interval between the first light emission and the second light emission. For example, when the length of the light emission period of each fire detector 300 is 2 seconds and the time interval between the first light emission and the second light emission is 4 seconds, if the test start signal is transmitted at a time when more than 2 seconds and less than 4 seconds have elapsed from time t31, the light emission period TA1 of the first light emission and the light emission period TA2 of the second light emission of the fire detector 300A do not overlap with the light emission period TB1 of the first light emission of the fire detector 300B. Therefore, time t32 is set to a time when more than 2 seconds and less than 4 seconds have elapsed from time t31.

[0067] At time t33, a test start signal is transmitted from the disaster prevention receiver 100 to the next fire detector 300C. The length of the period from time t32 to t33 is shorter than the length of the test execution period TB of the fire detector 300B. Time t33 is also set to a time such that the light emission period TB1 of the first light emission and the light emission period TB2 of the second light emission of the fire detector 300B do not overlap with the light emission period TC1 of the first light emission of the fire detector 300C, similar to time t32.

[0068] At time t34, the light emission of the first light emitting unit 316 of the fire detector 300A starts. At time t35, the light emission of the first light emitting unit 316 of the fire detector 300A ends. The period from time t34 to t35 becomes the light emission period TA1 of the first light emission of the fire detector 300A.

[0069] At time t36 after time t35, the light emission of the first light emitting unit 316 of the fire detector 300B starts. At time t37, the light emission of the first light emitting unit 316 of the fire detector 300B ends. The period from time t36 to t37 is the light emission period TB1 of the first light emission of the fire detector 300B.

[0070] At time t38 after time t37, the light emission of the first light emitting unit 316 of the fire detector 300C starts. At time t39, the light emission of the first light emitting unit 316 of the fire detector 300C ends. The period from time t38 to t39 is the light emission period TC1 of the first light emission of the fire detector 300C.

[0071] As shown in FIG. 10, the light emission period TA1 of the first light emission of the fire detector 300A, the light emission period TB1 of the first light emission of the fire detector 300B, and the light emission period TC1 of the first light emission of the fire detector 300C do not overlap with each other.

[0072] Regarding the second light emission, similar to the first light emission, the light emission period TA2 of the second light emission of the fire detector 300A, the light emission period TB2 of the second light emission of the fire detector 300B, and the light emission period TC2 of the second light emission of the fire detector 300C do not overlap with each other.

[0073] At time t40, a test end signal and a test result are transmitted from the fire detector 300A to the disaster prevention receiving board 100. The period from time t31 to t40 is the test execution period TA of the fire detector 300A. Next, at time t41, a test end signal and a test result are transmitted from the fire detector 300B to the disaster prevention receiving board 100. The period from time t32 to t41 is the test execution period TB of the fire detector 300B. Next, at time t42, a test end signal and a test result are transmitted from the fire detector 300C to the disaster prevention receiving board 100. The period from time t33 to t42 is the test execution period TC of the fire detector 300C. The test execution periods TA to TC partially overlap. In other words, the test execution periods TA to TC are shifted by a shorter time than the length of the test execution periods TA to TC.

[0074] In the example shown in FIG. 10, any of the above-described first to fourth methods may be adopted as the grouping method. For example, when the above-described first method is adopted and grouping is performed for each predetermined number of units, even when it is not allowed for a plurality of fire detectors 300 to emit light simultaneously due to the allowable current of the system, since the emission periods do not overlap among the plurality of fire detectors 300 included in the same group, an excess of the allowable current of the system is prevented. In addition, when the example shown in FIG. 8 is adopted, more fire detectors 300 than the number of fire detectors 300 that can be included in one group can be included in one group.

[0075] Note that the timing at which the start of the test is instructed among FIGS. 8 to 10 may be preset, or may be switched according to the operation of the maintenance staff or according to predetermined conditions.

[0076] According to the first embodiment described above, since the tests of the plurality of fire detectors 300 are performed in parallel, the time required for the tests of these fire detectors 300 is shortened. In particular, as shown in FIG. 8, when the tests of all the fire detectors 300 included in the same group are started simultaneously, the time required for the tests of these fire detectors 300 is further shortened as compared with the case where the tests of the plurality of fire detectors 300 are performed in order. Or, as shown in FIG. 9, when the tests of the fire detectors 300 are started such that the emission periods of at least two fire detectors 300 included in the same group overlap, the maximum current required for the test is reduced as compared with the case where the tests of all the fire detectors 300 included in the same group are started simultaneously. Or, as shown in FIG. 10, when the tests of the fire detectors 300 are started such that the respective emission periods of the fire detectors 300 included in the same group do not overlap, the maximum current required for the test is reduced as compared with the case where the tests of the fire detectors 300 are started such that the emission periods of at least two fire detectors 300 included in the same group overlap.

[0077] Furthermore, when a plurality of fire detectors 300 are grouped in a predetermined number as in the first method described above, even when the number of fire detectors 300 is large, the tests of the fire detectors 300 included in each group can be performed in parallel. Or, when grouped such that fire detectors 300 with different power supply systems are included in the same group as in the second method described above, the fire detectors 300 included in the group can be made to emit light simultaneously in the test. Or, when grouped such that, in the order from closest to the power supplies 101, 201A, or 201B that supply power to each fire detector 300, the number of configured units decreases as the distance from the power supplies 101, 201A, or 201B increases as in the third method described above, even if the voltage drop increases as the distance from the power supplies 101, 201A, or 201B increases, the fire detectors 300 included in the group can be made to emit light simultaneously in the test. Or, when grouped such that adjacent fire detectors 300 are not included in the same group as in the fourth method described above, even if the tests of the fire detectors 300 included in the same group are performed in parallel, no unmonitored area where fire monitoring is not performed will occur during the test.

[0078] 2. Second Embodiment In the second embodiment, the devices to be tested are different from those in the first embodiment. However, the point that the tests of a plurality of devices are performed in parallel is the same as in the first embodiment.

[0079] FIG. 11 is a diagram showing an example of a disaster prevention system 30 according to the second embodiment. The disaster prevention system 30 includes a disaster prevention receiving panel 100, relay amplification panels 200A, 200B, and 200C, a plurality of signal converters 500, and a plurality of push-button reporting devices 600. Note that in FIG. 11, mainly only the configuration related to the test of the signal converter 500 is shown, and other configurations are omitted. Also, similar to FIG. 1, the number of relay amplification panels 200 is not limited to the example shown in FIG. 11. The number of relay amplification panels 200 may be less than 3 or more than 3.

[0080] A plurality of signal converters 500 are provided, for example, at predetermined intervals in a tunnel. The installation intervals of the plurality of signal converters 500 are smaller than the installation intervals of the plurality of relay amplification boards 200. The push-button reporting device 600 is provided, for example, on a fire hydrant installed at a predetermined interval in the tunnel.

[0081] The disaster prevention receiving board 100, the plurality of relay amplification boards 200, the plurality of signal converters 500, and the push-button reporting device 600 are connected via signal lines 410 and power lines 411. More specifically, the disaster prevention receiving board 100 and the relay amplification boards 200A, 200B, and 200C are connected to the signal lines 410 and the power lines 411 in the same manner as the disaster prevention system 10 according to the first embodiment. A plurality of signal converters 500 are connected between the disaster prevention receiving board 100 and the relay amplification board 200A, between the relay amplification boards 200A and 200B, and between the relay amplification boards 200B and 200C, respectively. Also, one push-button reporting device 600 is connected to each of the plurality of signal converters 500.

[0082] In the second embodiment, the disaster prevention receiving board 100 includes a power source 102. The power source 102 supplies power to the plurality of signal converters 500 connected between the disaster prevention receiving board 100 and the relay amplification board 200A. The signal converters 500 supplied with power from the power source 102 belong to the fourth power supply system.

[0083] The relay amplification boards 200A and 200B each include a power source 202A and 202B, respectively. The power source 202A supplies power to the plurality of signal converters 500 connected between the relay amplification board 200A and the relay amplification board 200B. The signal converters 500 supplied with power from the power source 202A belong to the fifth power supply system. The power source 202B supplies power to the plurality of signal converters 500 connected between the relay amplification board 200B and the relay amplification board 200C. The signal converters 500 supplied with power from the power source 202B belong to the sixth power supply system.

[0084] In the second embodiment, tests of a plurality of signal converters 500 are performed in parallel. The configurations of the disaster prevention receiver 100 and the relay amplifier 200 of the disaster prevention system 30 according to the second embodiment are basically the same as the configurations of the disaster prevention receiver 100 and the relay amplifier 200 of the disaster prevention system 10 according to the first embodiment.

[0085] The push-button type reporting device 600 has a push button 601 that is used by a general user in an emergency such as the occurrence of an accident or a fire. When the push button 601 is pressed, the push-button type reporting device 600 makes a report to the disaster prevention receiver 100 via the signal converter 500.

[0086] The signal converter 500 is a device for converting the communication method between the disaster prevention receiver 100 and the push-button type reporting device 600. When the push button 601 of the push-button type reporting device 600 connected to the signal converter 500 is pressed, the signal converter 500 transmits a push signal to the disaster prevention receiver 100. The signal converter 500 is an example of the "terminal device" according to the present invention.

[0087] FIG. 12 is a diagram showing an example of the configuration of the signal converter 500. The signal converter 500 includes a control unit 511, a storage unit 512, a communication unit 513, and a detection circuit 514. In FIG. 12, only the configuration related to the test of the signal converter 500 is mainly shown, and other configurations are omitted.

[0088] The control unit 511, the storage unit 512, and the communication unit 513 are basically the same as the control unit 111, the storage unit 112, and the communication unit 113 of the disaster prevention receiver 100 according to the first embodiment. However, a program for realizing the function of the signal converter 500 is stored in the storage unit 512. The communication unit 513 is a communication interface for connecting the signal converter 500 to the signal line 410. The communication unit 513 is used to communicate with other devices connected via the signal line 410.

[0089] The detection circuit 514 detects that the push button 601 of the push-button type reporting device 600 has been pressed.

[0090] The control unit 511 functions as a test means 521 and a transmission means 522. These functions are realized by the control unit 511 executing a program stored in the storage unit 512, performing calculations by the control unit 511, or controlling each part of the signal converter 500.

[0091] The test means 521 tests the signal converter 500 under the control of the disaster prevention receiver 100. For example, the test means 521 starts the test according to the instruction of the disaster prevention receiver 100, and performs a test to confirm whether the detection circuit 514 operates normally in response to a pseudo-press of the push button 601 of the push button type reporting device 600. During the period when the pseudo-press of the push button 601 in the detection circuit 514 is on, the current consumption is higher than that during the period when the pseudo-press of the push button 601 is off.

[0092] The transmission means 522 transmits the test result to the disaster prevention receiver 100.

[0093] In the initial setting, for example, the disaster prevention receiver 100 generates a plurality of groups by dividing a plurality of signal converters 500 into a plurality of groups, and stores the information of these groups in the group table 124. The method of generating groups is basically the same as the method described in the first embodiment. However, in the second embodiment, since the signal converter 500 does not perform dual monitoring unlike the fire detector 300, the fourth method of grouping so that adjacent test objects are not included in the same group is not used.

[0094] FIG. 13 is a diagram showing an example of the group table 124 according to the second embodiment. The group table 124 is stored in the storage unit 112 of the disaster prevention receiver 100. The group table 124 includes a group ID and a terminal ID. The group ID is an identifier that uniquely identifies a group. The terminal ID is an identifier that uniquely identifies the signal converter 500. Each group ID is associated with the terminal ID of the signal converter 500 included in that group. In the example shown in FIG. 13, the group with the group ID of "011" includes the signal converters 500A to 500C.

[0095] Figure 14 is a sequence chart showing an example of the operation of the disaster prevention system 30 according to the second embodiment. In step S21 of this operation, the instruction means 122 of the disaster prevention receiver 100 transmits a test start signal instructing the start of the test to each signal converter 500. When receiving the test start signal from the disaster prevention receiver 100, the signal converter 500 shifts to the test mode, and the test of the signal converter 500 is started. In step S22, the test means 521 of the signal converter 500 operates the detection circuit 514 to turn on the pseudo-pressing of the push button 601. In step S23, the test means 521 determines whether or not the pseudo-pressing of the push button 601 is detected by the detection circuit 514. When the detection circuit 514 outputs in response to the pseudo-pressing of the push button 601, it is determined that the pseudo-pressing of the push button 601 is detected. When it is determined that the pseudo-pressing of the push button 601 is detected, it indicates that the detection circuit 514 is operating normally. On the other hand, when no output is made in response to the pseudo-pressing of the push button 601, it is determined that the pseudo-pressing of the push button 601 is not detected. When it is determined that the pseudo-pressing of the push button 601 is not detected, it indicates that the detection circuit 514 is not operating normally.

[0096] In step S24, the test means 521 of the signal converter 500 operates the detection circuit 514 to turn off the pseudo-pressing of the push button 601. In step S25, a test end signal indicating that the test has ended and the test result determined in step S23 are transmitted to the disaster prevention receiver 100. When the test end signal and the test result are transmitted, the signal converter 500 shifts from the test mode to the normal mode, and the test of the signal converter 500 ends.

[0097] The processing shown in Figure 14 is performed in order for each group. When the processing shown in Figure 14 is completed for all the signal converters 500 included in the first group, the processing shown in Figure 14 is performed for the signal converters 500 included in the next group. In this way, the processing shown in Figure 14 is repeated until the processing is completed for all groups.

[0098] The timing for instructing the start of the test according to the second embodiment is the same as the timing shown in FIGS. 8 to 10 described in the first embodiment. However, in the second embodiment, instead of the first light emission and the second light emission, the pseudo-pressing of the push button 601 becomes on in the detection circuit 514. Here, as shown in FIG. 13, it is assumed that the signal converters 500A to 500C are included in the group with the group ID of "011". For example, similar to the example shown in FIG. 8, the start of the test of the signal converter 500 is instructed so that the tests of all the signal converters 500A, 500B, and 500C included in the same group are started simultaneously. Or, similar to the example shown in FIG. 9, the tests of the signal converters 500A to 500C included in the same group are started at different timings, and the start of the test is instructed so that the periods during which the pseudo-pressing of the push button 601 becomes on in the detection circuits 514 of at least two of these signal converters 500 overlap. Or, similar to the example shown in FIG. 10, the tests of the signal converters 500A to 500C included in the same group are started at different timings, and the start of the test is instructed so that the periods during which the pseudo-pressing of the push button 601 becomes on in the detection circuits 514 of these signal converters 500 do not overlap.

[0099] According to the second embodiment described above, since the tests of the plurality of signal converters 500 are performed in parallel, the time required for the tests of these signal converters 500 is shortened.

[0100] 3. Modification The present invention is not limited to the above-described embodiments. Each of the above-described embodiments may be modified and implemented as follows. Each embodiment and the modification may be used in combination or may be switched and used according to the execution. Similarly, the following modifications may be used in combination or may be switched and used according to the execution.

[0101] For example, the disaster prevention system may include both the configuration shown in FIG. 1 according to the first embodiment and the configuration shown in FIG. 11 according to the second embodiment. In this modification, in addition to the relay amplification boards 200A to 200C, a plurality of fire detectors 300, a plurality of signal converters 500, and a plurality of push-button reporting devices 600 are connected to the disaster prevention receiving board 100. The disaster prevention receiving board 100 includes a power supply 101 that supplies power to the fire detectors 300, and a power supply 102 that supplies power to the signal converters 500 and the push-button reporting devices 600. Similarly, the relay amplification board 200A includes a power supply 201A that supplies power to the fire detectors 300, and a power supply 202A that supplies power to the signal converters 500 and the push-button reporting devices 600. The relay amplification board 200B includes a power supply 201B that supplies power to the fire detectors 300, and a power supply 202B that supplies power to the signal converters 500 and the push-button reporting devices 600. Then, the disaster prevention receiving board 100 controls the timing to start the tests for both the test of the fire detectors 300 and the test of the signal converters 500. According to this modification, both the time required for the test of the fire detectors 300 and the time required for the test of the signal converters 500 are shortened.

[0102] In each of the above-described embodiments, the disaster prevention system 10 or 30 may not include the relay amplification board 200. FIG. 15 is a diagram showing an example of the disaster prevention system 50 according to this modification. The disaster prevention system 50 includes a disaster prevention receiving board 100 and a plurality of fire detectors 300. The disaster prevention receiving board 100 and the plurality of fire detectors 300 are connected via a signal line 400 and a power supply line 401. Similar to the example shown in FIG. 1, the disaster prevention receiving board 100 includes a power supply 101. However, in the disaster prevention system 50, the power supply 101 supplies power to all the fire detectors 300 connected to the power supply line 401. Also, in this modification, the method of grouping the plurality of fire detectors 300 or signal converters 500 may be selected according to the system configuration. For example, in the case of a configuration without the relay amplification board 200 as in the disaster prevention system 50 shown in FIG. 15, a third method of grouping may be adopted in which the number of components in the group decreases as the distance from the power supply 101 increases, in order from the one closer to the power supply 101 that supplies power to each fire detector 300.

[0103] In each of the above-described embodiments, the device connected to the signal converter 500 is not limited to the push-button reporting device 600. For example, a fire hydrant or a water spray automatic valve may be connected to the signal converter 500. In this modification, in the detection circuit 514 of the signal converter 500, a pseudo-operation of the fire hydrant or the water spray automatic valve is turned on. When the detection circuit 514 is operating normally, if a pseudo-operation of the fire hydrant or the water spray automatic valve is turned on, this operation is detected by the detection circuit 514. On the other hand, when the detection circuit 514 is not operating normally, even if a pseudo-operation of the fire hydrant or the water spray automatic valve is turned on, this operation is not detected by the detection circuit 514.

[0104] In each of the above-described embodiments, the plurality of fire detectors 300 or the plurality of signal converters 500 do not necessarily have to be divided into a plurality of groups. For example, when the number of fire detectors 300 or signal converters 500 is small, grouping may not be performed. In this modification, the instruction means 122 of the disaster prevention receiving panel 100 instructs the start of the test so that all the fire detectors 300 or signal converters 500 connected to the disaster prevention receiving panel 100 are tested in parallel.

[0105] In each of the above-described embodiments, the installation location of the disaster prevention system 10 or 30 is not limited to a tunnel. The disaster prevention system 10 or 30 may be installed anywhere as long as it is a place where a fire may occur. Also, the disaster prevention control panel is not limited to the disaster prevention receiving panel 100. For example, a fire receiver may be used as the disaster prevention control panel instead of the disaster prevention receiving panel 100.

[0106] In each of the above-described embodiments, the configuration of the disaster prevention system 10 or 30 is not limited to the above-described examples. The disaster prevention system 10 or 30 may be configured to include one or more of the above-described devices, or may be configured without including some of the devices. Also, the entity having the function of the disaster prevention system 10 or 30 is not limited to the above-described examples. For example, the function of the disaster prevention receiving panel 100 may be realized by a plurality of devices cooperating with each other.

[0107] In each of the above-described embodiments, the operation of the disaster prevention system 10 or 30 is not limited to the above-described examples. The processing procedures of the disaster prevention system 10 or 30 may be rearranged as long as there is no contradiction. Also, some of the processing procedures of the disaster prevention system 10 or 30 may be omitted.

[0108] Another aspect of the present invention may provide a method having steps of processing performed in the disaster prevention system 10 or 30, the disaster prevention receiver 100, the fire detector 300, and the signal converter 500. Still another aspect of the present invention may provide a program executed in the disaster prevention receiver 100, the fire detector 300, or the signal converter 500. This program may be provided by being stored in a computer-readable recording medium or may be provided by being downloaded via the Internet or the like.

Explanation of Reference Numerals

[0109] 10, 30, 50: Disaster prevention system, 100: Disaster prevention receiver, 121: Generation means, 122: Instruction means, 200: Relay amplifier board, 300: Fire detector, 321: First test means, 322: Second test means, 323: Transmission means, 500: Signal converter, 521: Test means, 522: Transmission means, 600: Push-button reporting device

Claims

[Claim 1] A disaster prevention system including a plurality of terminal devices and a disaster prevention control panel, The disaster prevention control panel instructs the plurality of terminal devices to start the test so that a period from when the test is started to when the test is ended in each terminal device overlaps with the period of the other terminal devices, The plurality of terminal devices start the test in accordance with an instruction from the disaster prevention control panel, The plurality of terminal devices are divided into a plurality of groups so that terminal devices having overlapping monitoring areas are not included in the same group; The disaster prevention control panel instructs the start of the test so that the periods of at least two terminal devices included in the same group overlap. Disaster prevention system.

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