JPH1166451A - Fire alarm installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the cutoff control of lines even for a lot of kinds of faults by turning on/off a cutoff circuit under control at the side of a receiver. SOLUTION: When any fault occurs at a terminal such as a line 5, repeater RE or detector DE, for example, the automatic cutoff of a receiver 3 is executed. Namely, when a user inputs a desired branch line 5-1 (5-2 to 5-m) to be cutoff, under the control of a central control unit, an address signal relevant to an iscollator I1 (I2 -Im) of the relevant branch line 5-1 (5-2 to 5-m) and a command signal showing switch-off are transmitted from a transmission part. When this command signal is recognized by the isolator I1 (I2 -Im), a switch is turned off and the relevant branch line 5-1 (5-2 to 5-m) is cutoff from a system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm system in which a receiver and a plurality of terminals (for example, detectors and smoke evacuating devices) are connected via a line, and in particular, the receiver and the terminal are connected to each other. The present invention relates to a fire alarm system provided with a plurality of disconnection circuits interposed on a line between them and electrically disconnecting the line.

[0002]

2. Description of the Related Art As a technique relating to a fire alarm system provided with a disconnection circuit capable of disconnecting a line on a line connecting a receiver and a plurality of terminals, for example, Japanese Utility Model Laid-Open No. 5-229.
No. 4 disclosed in Japanese Unexamined Patent Publication No. 62-2223.
No. 98 discloses a self-fire alarm system.

The line disconnecting circuit disclosed in Japanese Utility Model Laid-Open No. 5-2294 is for disconnecting a line in a range where the line or the sensor has a fault such as a short circuit when the line or the sensor has a fault. It comprises a short-circuit detection circuit for detecting occurrence, a switch circuit for disconnecting a short-circuited line, a transmission circuit for notifying a receiver that the line has been disconnected, and the like. A plurality of such line disconnecting circuits are installed on the line between the receiver and the terminal, and when a short circuit occurs on the line, this short circuit is detected and the line is automatically cut off, and the receiver is connected to the line. A signal indicating the disconnection operation is transmitted to the receiver in order to identify which disconnection circuit has been activated. This action prevents the entire system from becoming inoperable due to a partial short circuit.

The self-fire alarm system disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 62-222398 is used to disconnect terminals in a construction area or an unused area from the system for a long time. A plurality of trunk repeaters capable of separating the line are installed on the line connecting the terminal and the terminal, and the line can be separated by operating the trunk repeater under the control of the receiver side.

[0005]

However, in the fire alarm system provided with the above-mentioned line separating circuit, a circuit for determining whether or not to separate the line is added to each of the plurality of line separating circuits. Therefore, the receiver did not determine whether to disconnect the track. for that reason,
Only simple judgments could be made as to whether or not to cut the track, and no complicated judgments could be made. For example, the criterion is that the voltage between the lines becomes equal to or less than a predetermined value, that is,
It is limited only when a short circuit occurs between lines. Further, if an integrated circuit capable of making a complicated determination is provided for each of the line disconnection circuits, an integrated circuit for the line disconnection circuit is required, which increases the cost of the entire system. Therefore, for example, it was not possible to cope with a case where an incomplete failure occurred in the terminal. In addition, since the judgment was made on the line disconnection circuit arranged at each location of the line, it was impossible to judge in consideration of the entire system.

[0006] The self-fire alarm system described above is designed to automatically disconnect a track when it becomes necessary to disconnect the track, for example, by operating a receiver. No disconnect control is performed. Therefore, for example, if a short circuit occurs on a track or a terminal during monitoring without an operator, the entire system becomes inoperable until the operator rushes to perform the disconnection operation.

[0007] The present invention has been made in order to solve the above problems.
In a fire alarm system that connects a receiver and multiple terminals via a track, if a fault such as a short circuit occurs on the track or terminal, it is automatically determined whether or not it is a fault, and the fault is determined. In this case, the fault location can be automatically separated from the system, and a complicated determination process can be performed in determining whether the fault has occurred. For example, not only short-circuits but also various types of faults can be performed. Another object of the present invention is to provide a fire alarm system capable of controlling disconnection of a track.

[0008]

In order to solve the above-mentioned problems, an invention according to claim 1 is a fire alarm system in which a receiver and a plurality of terminals are connected via a line, and a plurality of track-like locations are provided. A plurality of disconnection circuits interposed in the receiver and capable of electrically disconnecting the line, and a control provided in the receiver for operating the disconnection circuit to disconnect or connect the line at the place where the disconnection circuit is provided. And a control means for performing the following.

According to the first aspect of the present invention, the on / off operation of the disconnection circuit can be performed by the control of the receiver, so that the on / off operation of the disconnection circuit can be performed under various complicated conditions. Can be controlled. That is, in the conventional system in which the on / off operation of the disconnection circuit is automatically performed based on the judgment in the disconnection circuit, the condition of the on / off operation is limited to a simple condition (for example, when the line is short-circuited). In contrast, according to the present invention, since control can be performed from the receiver side, the operation control of the disconnection circuit can be performed under various conditions and in consideration of the entire system. Therefore, for example, when a fault occurs on a track or a terminal and it becomes necessary to separate the faulty portion, or when a terminal installed in a construction area or an unused area is separated from the system, control by the control device can be used. It is possible to cope with the above-mentioned faults, not only for obvious short-circuit faults, but also for various halfway faults and system faults. The control of the disconnection circuit can be performed by automatic control on the receiver side, or can be performed by manual operation of the receiver by an operator.

Here, the terminal includes, for example, a fire detector,
Includes gas detectors, repeaters, smoke elimination devices, and the like.

According to a second aspect of the present invention, in the fire alarm system according to the first aspect, an abnormality determining means for determining whether or not a failure has occurred on the line in the receiver based on a signal input from the line. Is provided, and the control means performs disconnection control for separating the line based on the determination that the abnormality has occurred by the abnormality determination means.

According to the second aspect of the present invention, the operation of the disconnection circuit can be automatically controlled by the determination of the abnormality determining means. Conventionally, a short-circuit detecting means for only detecting a short-circuit between lines is provided in each disconnection circuit, whereas in the present invention, an abnormality determining means for detecting other abnormalities is provided in a receiver. Therefore, a variety of complicated conditions can be set as conditions for determining a fault on a track, and the condition of the entire system can be included.

According to a third aspect of the present invention, in the fire alarm system according to the second aspect, the disconnection control by the control means includes a plurality of disconnection circuits that are sequentially turned on / off to include the failure location. A search process is performed to determine a disconnection circuit that separates the line in the shortest time, and then the disconnection circuit determined in the search process is activated to isolate a faulty portion.

According to the third aspect of the present invention, control is performed to isolate the faulty part in the shortest time, and the influence of the fault on the entire system can be minimized. As a specific method of the search processing, for example, a method described in claim 4 or an on / off operation is sequentially performed from the disconnection circuit farthest to the receiver toward the receiver side, and the failure detection disappears. At that point, the disconnection circuit that was turned on is used as the corresponding disconnection circuit, and conversely, the disconnection circuit near the receiver is turned on and off in order from a distance, and the failure detection is performed. There can be various methods, such as a method in which a disconnection circuit immediately before a disconnection circuit that does not disappear is used as the relevant disconnection circuit.

According to a fourth aspect of the present invention, in the fire alarm system according to the third aspect, the search processing is performed on all disconnection circuits on the line as a search target, and the line including the fault location is separated at the shortest. In order to determine a target disconnection circuit, a trial operation is performed from the search target disconnection circuit 1
A first step of selecting the disconnection circuits, a second step of operating the disconnection circuit selected in the first step to disconnect a range of the line, and determining whether a signal indicating a failure disappears from the line by the disconnection. A third step of determining whether or not there is a failure in the separated range; and a fourth step of re-searching the disconnection circuit in the range in which it is determined that there is a failure.
The first to fourth steps are repeatedly performed to determine the target disconnection circuit. In the first step, the selection of the disconnection circuit is performed by selecting the second disconnection circuit among the disconnection circuits to be searched. The configuration is such that the difference between the number of disconnection circuits included in the range separated in the step and the number of disconnection circuits included in the range not separated is substantially minimized.

According to the fourth aspect of the present invention, it is possible to determine the disconnection circuit for disconnecting the line including the faulty part in the shortest time with the highest efficiency and the shortest time.

According to a fifth aspect of the present invention, in the fire alarm system according to any one of the first to fourth aspects, an address is assigned to each of the plurality of terminals, and a receiver transmits the address to the address. The communication is performed while identifying the individual terminals based on the disconnection circuit monitoring terminal data representing the terminal to be disconnected by the operation of each of the plurality of disconnection circuits. Storage means is provided, and the control means of the receiver operates the plurality of disconnection circuits one by one based on an arbitrary start signal, and all of the addresses assigned when the respective disconnection circuits are activated. While performing communication with the terminal, comparing the disconnection circuit monitoring terminal data corresponding to the active disconnection circuit and the terminal that did not respond as a result of the communication,
When the terminal in the disconnection circuit monitoring terminal data does not match the non-responding terminal, an abnormal address identification process for identifying the terminal address as an abnormal address is performed.

In general, when constructing or maintaining fire alarm equipment, there is a possibility that a plurality of terminals may be mistakenly installed or an address may be duplicated and installed. According to the fifth aspect of the present invention, by performing the abnormal address identification processing, it is possible to confirm whether there is a mistake in the terminal or a duplicate address. Here, for example, when the control means of the receiver identifies the address of a certain terminal as an abnormal address, it is preferable to cause the user to perform output processing for outputting (display output or print output) the data of the address. By this output processing, the abnormal address is transmitted to the user, and the amount of work during maintenance and construction can be reduced.

According to a sixth aspect of the present invention, in the fire alarm system according to any one of the first to fifth aspects, the receiver monitors a fire by communicating with each of the plurality of terminals. Normally, when there is no response from the communicating terminal, the terminal is determined to be abnormal, and the control means provided in the receiver stores disconnection sensor identification data capable of identifying the terminal disconnected by the disconnection control. Storage means, and identification means for identifying, when there is no response from the terminal in the communication, whether or not a terminal having no response by referring to the disconnection sensor identification data has been disconnected by the disconnection control. And
The receiver is configured to perform invalidation processing that does not determine that there is no abnormality in response to a non-response of the terminal when the terminal that has not responded is disconnected as a result of the identification by the identification unit.

According to this invention, when there is no response from the communicating terminal in the communication during the fire monitoring,
Normally, the receiver determines that the terminal is abnormal, but the terminal disconnected by the above disconnection control is canceled even if there is no response even if there is no response. Time communication can continue as usual. That is, there is no need to significantly change the processing procedure at the time of fire monitoring with the disconnection control.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing an entire system of a fire alarm system 1 according to this embodiment, FIG. 2 is a block diagram showing a circuit configuration of a receiver 3, and FIG. 3A is an isolator I1 as a disconnection circuit.
It is a schematic circuit diagram of (I2-Im).

The fire alarm system 1 of this embodiment is configured by connecting a plurality of repeaters RE... And a plurality of (fire) sensors DE... Is done. Sensors (not shown) and smoke prevention devices are connected to the repeaters RE. Further, on the line 5, isolators I1 to Im as disconnecting circuits are provided at a plurality of locations.

The wiring of the fire alarm system 1 is a mode in which one line is branched into a plurality of lines. For example, m branch lines 5-1 to 5-m are branched from a main line 5; Each of these branch lines 5-1 to 5-m is wired, for example, over one area of a building. Detectors DE... And repeaters RE are connected to these branch lines 5-1 to 5-m, respectively, and isolators I1 to Im are provided at positions closest to the receiver 3 side.

Note that the wiring state of the fire alarm system 1 is not limited to the above, and may be, for example, a closed-loop wiring or a plurality of wirings. Further, the arrangement of the isolators I1 to Im may be interposed between the respective sensors DE..., May be arranged on the main line, or may be variously arranged.

As shown in FIG. 2, the receiver 3 has a central control unit 31 and a ROM (Read Only Memory) as storage means.
y) 32 and RAM (Random Access Memory) 33,
A transmission unit 34, an abnormality determination unit 35, an operation unit 37 through which a user can perform data input operation, and a display / output unit 3 that performs display output to a display panel and print output from a printer.
8 and the like are connected via a bus 40. The central control unit 31, the ROM 32, the RAM 33, the transmission unit 34, the abnormality determination unit 35, and the like constitute control means.

The central control unit 31 controls each unit connected to the bus 40 in accordance with control data and control programs stored in the ROM 32 in the RAM 33 as a work area. For example, input processing from the operation unit 37, display /
An output process from the printing unit 38, a process of transmitting and receiving data with the abnormality determining unit 35, a process of transmitting and receiving data with the transmission unit 34, and the like are performed.

In the ROM 32, for example, in a predetermined storage area, isolator monitoring terminal data (disconnection circuit monitoring terminal data) indicating an address of a terminal disconnected from the system by each operation of the plurality of isolators I1 to Im.
Is stored in association with each of all the isolators I1 to Im.

The transmission section 34 is connected to the detector DE via the line 5.
, And repeaters RE, etc., and an isolator I1
~ Im. The receiver 3, the terminal, and the isolators I1 to Im transmit and receive data individually by, for example, polling communication. The line 5 serves as both a data line and a power line of a terminal, and is composed of a pair of lines 5L and 5C. Normally, a predetermined voltage is applied between the pair of lines 5L and 5C, and the data signal is transmitted by a pulse wave.

The abnormality discriminating section 35 includes a pair of lines 5L and 5C.
The voltage between them or the signal input from the line 5 is monitored to detect whether there is any abnormality. Since only one abnormality determination unit 35 is provided on the receiver 3 side, even if it is configured to perform complicated processing, it does not significantly affect the cost of the entire system. For example, by performing logic control using an integrated circuit, complicated processing such as determination of a plurality of types of failures and determination of a failure in consideration of the state of the entire system is possible. For example, all the sensors D generated when a short circuit occurs in the
It is possible to detect a fire detection state in E, a failure of the analog type sensor DE, and the like.

The isolator I1 (I2 to Im) is shown in FIG.
As shown in (A), a relay L for electrically disconnecting the line 5L, a b-contact switch Lb, and a surge absorbing circuit 4
3, a transmission circuit 41, a relay L, a stabilized power supply E for supplying power to the transmission circuit 41, a short-circuit detection unit 42, and the like.

The short-circuit detecting section 42 includes a pair of lines 5L, 5C
When the voltage between them falls below a predetermined value (ie, when a short circuit occurs), a signal is output to the relay L to turn off the switch Lb. The short-circuit detecting section 42 is an auxiliary device for coping with an extreme short-circuit, and has a simple configuration as in the related art.

The transmission circuit 41 includes an address matching circuit for comparing the address of its own with the calling address from the receiver 3 to detect that it has been designated when the addresses match, and a command signal from the receiver 3. , A signal is output to the relay L to turn on / off the switch Lb. The signal output from the transmission circuit 41 to the relay L has a higher priority than the signal output from the short-circuit detector 42.

The transmission circuit 41 and the stabilized power supply E are connected to the line 5L closer to the receiver 3 than the switch Lb. Even when the switch Lb disconnects the line 5L, the isolator I1 ( I2 to Im) can be controlled. Further, the short-circuit detecting unit 42 is connected to the line 5L on the side farther than the switch Lb with respect to the receiver 3, and even if the switch Lb disconnects the line 5L, the short-circuit on the far side from the receiver 3 is detected. The detection state is continued.

The surge absorbing circuit 43 absorbs a surge voltage generated when the switch Lb is turned on / off, has a high resistance, and does not affect the disconnection of the line 5L.

The fire alarm system 1 of this embodiment is configured as described above, and includes the isolator I1
Under the control of Im, the disconnection control of the line 5 is performed as follows, and even during the disconnection control of the line 5,
The fire monitoring by the normal polling communication can be performed by the cancellation processing as the invalidation processing. In addition, by the abnormal address identification processing described later using the isolators I1 to Im, it is possible to confirm whether there is a mistake in the installation location of the terminal or duplication of the terminal address, which may occur at the time of maintenance or construction of the fire alarm system 1. It has become.

Next, the disconnection control of the line 5 will be described. The disconnection control of the line 5 includes manual control by a user and automatic control by the receiver 3. Manual disconnection control is performed, for example, when disconnecting terminals DE... Installed in an area under construction or an unused area from the system. The user performs an input operation from the operation unit 37 using an operation panel or switch buttons. Is performed.

That is, the branch line 5 that the user wants to separate
When -1 (5-2 to 5-m) is input, the central control unit 3
1, the corresponding branch line 5-
1 (5-2 to 5-m) isolator I1 (I2 to I
An address signal corresponding to m) and a command signal indicating switch-off are transmitted. When the command signal is recognized by the isolator I1 (I2 to Im), the switch Lb is turned off, and the corresponding branch line 5-1 is turned off.
(5-2 to 5-m) are disconnected from the system.

The automatic disconnection control of the receiver 3 is executed, for example, when a failure occurs in a terminal such as the line 5, the repeaters RE, the sensors DE, and the like. This automatic disconnection control will be described with reference to the flowchart of the automatic disconnection control process of FIG. When a identifiable failure occurs on the line 5, a signal indicating the failure is input to the receiver 3 via the line 5, and the abnormality determination unit 35 determines that the failure has occurred. When a failure is detected, a search process (processes in steps S2 to S5) for searching where on the line 5 a failure has occurred is performed.

That is, in step S1, one isolator (SCI: Short Circuit Isolator) I1 (I2
Im) is selected and set, and a process of storing the address (for example, “1”) in a predetermined register is performed, and the process proceeds to step S2. In step S2, processing for transmitting the address stored in the register and a command indicating switch-off is performed. By this processing, the isolator I1 (I2 to Im) selected and set in step S1 operates to disconnect the branch line 5-1 (5-2 to 5-m) from the system. Then, control goes to a step S3.

In step S3, it is determined whether or not the detection of the occurrence of a failure by the abnormality determination unit 35 has disappeared. If the failure has disappeared, the search process is terminated, and the process proceeds to step S6. Move to step S4. In step S4, a process of transmitting the address stored in the register and a command indicating switch-on is performed, and the branch line 5-1 (5-2 to 5-m) separated in step S2 is returned to the system. Let it. Then, control goes to a step S5.

In step S5, the address value of the register is changed (for example, "1" is added) to change the isolators I1 to Im to be turned off in step S2 one by one, and the process returns to step S2. In other words, by repeating the processing of steps S2 to S5, the isolators I1 to Im are sequentially turned on / off one by one, and during this time, whether or not the signal indicating the failure from the line 5 disappears. Is determined, and which branch line 5
It is searched whether a failure has occurred in -1 to 5-m.

As a result of the determination processing in step S3, when the detection of the occurrence of the failure in the abnormality determination unit 35 disappears and the process proceeds to step S6, the fault location is separated by the isolators I1 to Im that are currently off. Judging that
The data indicating the active isolators I1 to Im is output to the print / display unit 38 to perform print output and display output. The automatic disconnection control process is terminated, and the receiver 3
Return to the normal routine.

By the printing / display output processing, the line 5
Information about whether there is a range that is cut off,
Information on which range is cut off is notified to the user, and the maintenance workability of the fire alarm system 1 is improved.

Note that the above-described search processing for searching at which point on the line 5 a fault has occurred (search processing for finding the isolators I1 to Im that isolates the faulty point on the line 5 at the shortest) is performed by the wiring of the line 5. State and isolator I1-Im
Can be changed as appropriate depending on the installation location.

For example, the isolators I1 to Im are connected to the line 5
In the case where the isolator is installed between the main line and the sensors DE, for example, all the isolators I1 to Im on the line 5 are to be searched, and the target isolator for separating the line 5 including the faulty point in the shortest time. To determine I1-Im,
A first step of selecting one of the isolators I1 to Im to be tested from among the isolators I1 to Im to be searched, and an isolator I1 to I1 selected in the first step
A second step of operating Im to isolate a range of the line 5; and a third step of determining whether there is a failure in the isolated range based on whether a signal indicating a failure disappears from the line 5 due to the disconnection. By repeating the fourth step of retrieving the isolators I1 to Im within the range determined to have the failure again, the target isolators I1 to Im can be determined.

Further, in the first step, the selection of the isolators I1 to Im depends on the isolator I to be searched.
The efficiency is improved by performing the condition under the condition that the difference between the numbers of the isolators I1 to Im included in the range to be separated in the second step and the isolators I1 to Im included in the range not separated in the second step is substantially minimized. It is possible to easily determine the target isolators I1 to Im in a short time.

Next, the cancel process will be described. First, with respect to this cancel processing, when the isolator I1 (I2 to Im) is operated during the disconnection control, data indicating the address of the operation isolator I1 (I2 to Im) is stored in a predetermined storage area in the RAM 33 (operation disconnection circuit identification). Data) and data indicating the address of the terminal to be disconnected from the system by this operation (disconnection sensor identification data).

The above-described cancellation processing is performed during a normal sequence processing during fire monitoring. In the normal fire monitoring process, an address signal of each terminal and a command signal indicating a request for transmitting fire sensing information are transmitted to the terminal via the line 5 according to a polling method, and a response signal is received from the corresponding sensor DE. To go. The response signal allows the receiver 3 to recognize information on the occurrence of a fire and information on the presence or absence of an abnormality.

In the process of receiving the response signal, if the response signal from the sensor DE is not received, the cancellation process is started. In the canceling process, if there is a non-responding sensor DE, if this sensor DE is a sensor DE that has been disconnected from the system by disconnection control, there is no abnormality without determining that there is no response and abnormal. This is the process that is determined.

When the cancel process is started due to the presence of the non-response sensor DE, a determination process is performed to determine whether or not the sensor DE is included in the disconnection sensor identification data stored in the storage process. . That is, the above-described determination is performed by the central control device 31, the ROM 32, and the RAM 33 as identification means.

As a result, if the data is not included in the above data, the process returns to the normal fire monitoring process as it is, and a determination is made that there is an abnormality. However, if it is included in the data, the data indicating no response is canceled, and the process returns to the normal fire monitoring process. Then, it is determined that there is no abnormality, and the process proceeds to a routine process of no abnormality. Thus, if the non-responding sensor DE is the sensor DE that has been disconnected from the system by the disconnection control, it is determined that there is no abnormality even if there is no response.

Next, the abnormal address identification processing will be described. This processing will be described with reference to the flowchart of the abnormal address identification processing in FIG.

The abnormal address identification processing is started, for example, when execution of the abnormal address identification processing is selected by a user's input operation using the operation unit and a start signal is input. In addition, the start signal for starting the abnormal address identification processing is, in addition to the input operation by the user,
It may be automatically generated in the routine processing of the central control device 31. When the abnormal address identification process is started, first, in step S11, a process of selecting and setting one isolator (SCI) I1 (I2 to Im) is performed, and the process proceeds to step S12. Step S
At 12, the selected and set isolator I1 (I2 to I2
m) The (SCI) is turned off, and the routine goes to Step S13.

In step S13, polling communication is performed with all the terminals to which the addresses have been assigned. In step S14, the addresses of the terminals that have not responded are detected and the RAM is detected.
33. Then, control goes to a step S15. In step S15, in step S14, the RAM 33
By comparing the address stored therein with the isolator monitoring terminal data in the ROM 32, it is determined whether or not they match, and if they match, the process proceeds to step S17. Moves to step S16.

As a result, if the two do not match and the process proceeds to step S16, the address of the isolator I1 (I2 to Im) operated in step S12 does not match the result of the comparison in step S15. The address of the terminal is stored in a predetermined storage area in the RAM 33, and the process proceeds to step S17.

In step S17, the isolator I1 (I2 to Im), which was turned off in step S12, is turned on to connect the line 5, and the process proceeds to step S18. In step S18, in order to change the isolators I1 to Im to be turned off in step S12 one by one, the address value of the selected terminal is changed (for example, "1" is added), and the process proceeds to step S19.

In step S19, it is determined whether or not all the terminals have been operated (for example, whether or not the address value of the terminal to be selected is a value obtained by adding "1" to the address value of the last terminal). If it is, the process proceeds to step S20, but if not, the process returns to step S12 to perform steps S12 to S12.
Step 19 is repeated. That is, steps S12 to S1
The process of No. 9 is performed for all the terminals to which the addresses are assigned.

In step S20, it is determined whether or not there is the address stored in step S16. If there is, the process proceeds to step S21, where the addresses of the isolators I1 to Im stored in the RAM 33 in step S16 and the terminal Is output as a faulty isolator address and a faulty terminal address, but if not, the process proceeds to step S22 to print and display without fault, and terminates this faulty address identification processing. It returns to the normal routine processing of the receiver 3.

As described above, according to the fire alarm system 1 of this embodiment, the on / off operation of the isolators I1 to Im can be controlled by the receiver 3, so that the on / off of the isolators I1 to Im can be performed. Operation can be controlled under a variety of complex conditions. That is, in the conventional system in which the on / off operation of the isolator is performed only on the isolator side and cannot be controlled by the receiver 3, the condition of the on / off operation is set to a simple condition (for example, when the lines 5L and 5C are short-circuited). In contrast to this, in the present invention,
Since the control can be performed from the receiver 3 side, the isolators I1 to Im under various conditions and in consideration of the entire system
Operation control is possible.

Further, since the operation of the isolators I1 to Im can be automatically controlled by the judgment of the abnormality judging section 35 of the receiver 3, it is possible to quickly suppress the failure of the line 5 from affecting the entire system. I can do it. Further, the plurality of isolators I1 to Im are sequentially turned on / off by the search processing.
After turning off and searching for the location of the fault, the appropriate isolators I1 to Im are operated to isolate the fault location. Therefore, control is performed to isolate the fault location in the shortest time, and the failure affects the entire system. Can be minimized.

Further, by operating the isolators I1 to Im one by one and performing polling communication with each terminal to detect an abnormal address, whether or not the terminals are arranged by mistake is determined.
It is possible to detect whether a terminal having an overlapping address is installed. Therefore, at the time of construction and maintenance of the fire alarm system 1, it is possible to confirm mistakes such as incorrectly installing a plurality of terminals or installing an overlapping address, thereby reducing the amount of work. Can be measured.

Further, during the normal fire monitoring, even when the disconnection control is performed by the cancel processing of ignoring the non-response of the sensors DE... Disconnected by the operation of the isolators I1 to Im, the communication during the fire monitoring is normally performed. Since the process can be continued, there is no need to largely change the processing procedure at the time of fire monitoring in accordance with the disconnection control, which is convenient.

The present invention is not limited to the fire alarm system 1 according to this embodiment. For example, as a failure on the line 5, a short circuit of the detectors DE and the relays RE is exemplified. As described above, various failures of various terminals such as an oscillator, a repeater, and a fire detector, a gas detector, a smoke prevention device, an acoustic device, and the like connected to the repeater are also described based on signals transmitted to the line 5. If it can be detected, it can be dealt with by the same processing of this embodiment.

Further, the wiring mode of the line 5 connecting the receiver 3 and each terminal is not limited to that of the present embodiment. For example, the wiring mode of the closed loop (the reception of one end and the other end of the line is In this case, a plurality of (for example, two) disconnection circuits may be turned off simultaneously as a set by connecting a plurality of (for example, two) disconnection circuits.
Failure points between the plurality of disconnection circuits can be separated from the system. In addition, in each of the processes (searching process, canceling process, abnormal address identification process, and the like) described in the present embodiment, the same process as that of the present embodiment is performed by treating the set of disconnection circuits as one unit. It is possible to cope with a closed loop wiring mode.

When the receiver 3 and each terminal are wired in a closed loop, the isolator needs to be controllable from both one side and the other side of the wiring connected to the isolator. For example, a circuit configuration shown in FIG. 3B, which is a circuit diagram of an isolator corresponding to a closed-loop wiring, may be used. That is, since the transmission circuit 41, the stabilized power supply E, and the short-circuit detection unit 42 are connected to the line 5L on both terminal sides of the switch Lb, even if the switch Lb disconnects the line 5L, the isolator IB is connected to the connection line 5L. It is possible to control from both sides of one side and the other side.

In addition, the detailed configuration and the like specifically shown in this embodiment, such as the circuit configuration of the isolators I1 to Im and the processing procedures such as search processing, cancellation processing, abnormal address identification processing, etc., do not depart from the gist of the invention. It can be changed appropriately within the range.

[0067]

According to the first aspect of the present invention, since the on / off operation of the disconnection circuit is performed by control of the receiver, the on / off operation of the disconnection circuit is controlled based on various complicated conditions. You can do it. Therefore, for example, when a fault occurs on a track or a terminal and it becomes necessary to separate the faulty portion, or when a terminal installed in a construction area or an unused area is separated from the system, control by the control device can be used. It is possible to cope with the above-mentioned faults, not only for obvious short-circuit faults, but also for various halfway faults and system faults. Also,
The disconnection circuit can be controlled by automatic control on the receiver side, or can be performed by manual operation of the receiver by an operator.

According to the second aspect of the present invention, the operation of the disconnection circuit can be automatically controlled by the judgment of the abnormality judging means. Has no effect.
Further, since the abnormality determining means is provided in the receiver, various complicated conditions can be set as the conditions for determining the failure on the track, and the condition of the entire system can be included.

According to the third aspect of the present invention, the control for separating the faulty portion at the shortest time is performed, and the influence of the fault on the entire system can be minimized.

According to the fourth aspect of the present invention, it is possible to determine the disconnection circuit for disconnecting the line including the faulty part in the shortest time with the highest efficiency and the shortest time.

According to the fifth aspect of the present invention, it is possible to confirm whether there is a mistake in the terminal or duplication of the address. Therefore, at the time of construction or maintenance of the fire alarm system, a plurality of terminals are installed by mistake. It is possible to confirm that there is no mistake, such as a wrong address or an overlapping address, thereby improving workability.

According to the sixth aspect of the present invention, even when disconnection control is performed, communication during fire monitoring can be continued as usual. Also, there is no need to significantly change the processing procedure at the time of fire monitoring with the disconnection control.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of an entire system of a fire alarm system according to an embodiment.

FIG. 2 is a block diagram showing a circuit configuration of the receiver in FIG.

FIG. 3 is a schematic block diagram showing a circuit configuration of an isolator as a disconnection circuit. FIG. 3A is a block diagram of an isolator corresponding to a system in which the isolator is connected to the receiver from only one side as shown in FIG. (B) is a block diagram of an isolator corresponding to a system configured with closed-loop wiring.

FIG. 4 is a flowchart illustrating a procedure of an automatic disconnection control process performed by the receiver.

FIG. 5 is a flowchart showing a procedure of an abnormal address identification process performed by the receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire alarm equipment RE ... Repeater DE ... Detector 5 Line 3 Receiver 31 Central controller 32 ROM 33 RAM 34 Transmission part 35 Abnormality judgment part I1-Im Isolator (disconnection circuit) L Relay Lb b contact switch 41 Transmission circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G08B 26/00 G08B 26/00 B 29/06 29/06

Claims (6)

[Claims] 1. A fire alarm system comprising a receiver and a plurality of terminals connected via a line, comprising: a plurality of disconnection circuits provided at a plurality of locations on the line and capable of electrically disconnecting the line; A fire alarm system comprising: a control unit provided in the receiver and configured to control the operation of the disconnection circuit to disconnect or connect a line at a location where the disconnection circuit is provided. 2. The receiver according to claim 1, further comprising an abnormality determining unit configured to determine whether or not a failure has occurred on the line based on a signal input from the line. 2. The fire alarm system according to claim 1, wherein a disconnection control for disconnecting the track is performed based on a determination that the line has occurred. 3. The disconnection control by the control means is performed by sequentially turning on / off a plurality of disconnection circuits.
3. The fire alarm according to claim 2, wherein a search process is performed to find a disconnection circuit that separates the line including the failure point in the shortest time, and thereafter, the disconnection circuit determined in the search process is activated to isolate the failure point. Facility. 4. The search processing includes searching for all the disconnection circuits on a line, and determining a target disconnection circuit for disconnecting the line including the faulty part in the shortest time. A first step of selecting one disconnection circuit to be operated on a trial basis; a second step of operating the disconnection circuit selected in the first step to disconnect a range of the line; The third is to judge whether there is a failure in the separated area based on whether or not it disappears from
And a fourth step in which a disconnection circuit within a range determined to have a failure is searched again. The first to fourth steps are repeatedly performed to determine the target disconnection circuit. In the first step, the selection of the separation circuit is performed by determining the difference between the number of the separation circuits included in the range to be separated in the second step and the number of the separation circuits included in the range not to be separated in the separation circuits to be searched. 4. The fire alarm system according to claim 3, wherein the alarm is performed on the condition that it is substantially minimized. 5. An address is assigned to each of the plurality of terminals, and a receiver performs communication while identifying each of the terminals based on the address, and the receiver includes the plurality of disconnection circuits. Storage means for storing disconnection circuit monitoring terminal data representing a terminal disconnected by each operation of the disconnection circuit monitoring terminal data corresponding to each of all disconnection circuits, and the control means of the receiver, based on an arbitrary start signal, One or more disconnection circuits
It operates individually, communicates with all the terminals to which addresses are assigned at the time of activation of each disconnection circuit, and without response as a result of communication with the disconnection circuit monitoring terminal data corresponding to the activated disconnection circuit. Compared with the terminal that was, when the terminal in the disconnection circuit monitoring terminal data and the terminal of no response do not match, performing an abnormal address identification process that identifies the address of this terminal as an abnormal address The fire alarm system according to claim 1. 6. The receiver monitors a fire by communicating with each of the plurality of terminals, and normally determines that the terminal is abnormal when there is no response from the terminal with which the communication has been performed. The provided control means includes: storage means for storing disconnection sensor identification data capable of identifying the terminal disconnected by the disconnection control; and, when there is no response from the terminal in the communication, the disconnection sensor identification data. Identification means for referencing whether or not a terminal having no response has been disconnected by the disconnection control is provided, and as a result of the identification by the identification means, the terminal having no response has been disconnected. The fire alarm system according to any one of claims 1 to 5, wherein when the terminal does not respond, the terminal performs an invalidation process that does not determine that the terminal has no response.