JPH053039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to fire alarm equipment in which a plurality of detectors installed in the same warning area are grouped and monitored by a receiver.

[Prior Art] Conventionally, in the case of large-scale fire alarm equipment with a wide warning area, a plurality of repeaters are connected to a receiver, and a plurality of detectors are connected to each of the plurality of sensor lines drawn out from the repeater. The facility has a configuration that connects.

On the other hand, for medium-sized or smaller fire alarm equipment,
The equipment configuration is such that a plurality of sensors are connected to each of the plurality of sensor lines drawn out from the receiver without providing a repeater.

By the way, in recent years, in order to identify and display the area where the fire occurred on the receiver, a unique address is assigned to each sensor, and a unique address signal is sent out at the same time as the fire detection signal, so that the receiver can identify the area where the fire occurred. It is possible to identify and display the

[Problems to be solved by the invention] However, in the case of such fire alarm equipment in which a unique address is set for each sensor, for example, multiple sensors installed in the same warning area may have different addresses. Addresses are now set, and all detectors must be equipped with a circuit function to send a unique address signal to the receiver upon fire detection, which increases equipment costs for medium-sized or smaller fire alarm equipment. This has been a major obstacle to the practical implementation of equipment that uses receivers to identify and display areas where fires have occurred.

Also, if each sensor has a unique address,
When the number of addresses increases and there is a limit to the number of addresses, the security area becomes narrower. Another problem is that the large number of addresses increases the burden on the receiver.

[Means for Solving the Problems] The present invention has been made in view of the problems of the prior art, and it provides a method for setting one unique address to a plurality of sensors installed in the same warning area. It is suitable for medium-sized or smaller facilities that have a simple equipment configuration and are inexpensive in terms of cost. The purpose of this project is to provide fire alarm equipment that is effective.

In order to achieve this purpose, in the present invention, a master sensor is connected to the power signal line drawn out from the receiver to the guarded area, and the same warning line is connected to the power supply signal line drawn out from the parent sensor. One or more child sensors installed in the area are connected in a subordinate manner, and the sensor base of the parent sensor is connected to a terminal that also serves as a power source and a signal line from the receiver, and a terminal that also serves as a power source to connect the child sensor. A terminal for connecting a signal line, an alarm current due to fire detection of the own fire detection section installed in the sensor body attached to the sensor base of the parent sensor, and a power supply signal line drawn out from the terminal. A current detection circuit detects an alarm current caused by fire detection of a connected child sensor, an address setting circuit, and a unique address setting is received by the address setting circuit, and the fire detection output from the current detection circuit is In response to this, a transmission circuit is provided to send out an alarm signal containing fire detection information and address information to the receiver.

[Function] In the fire alarm system of the present invention having such a configuration, a plurality of sensors installed in the same warning area are connected to one parent sensor and subordinated to the parent sensor. It can be grouped by configuring one or more child sensors, and the address signal transmission function only needs to be provided in the parent sensor, so conventional sensors without unique addresses can be used as child sensors as they are. This greatly simplifies the equipment configuration for identifying and displaying the area where a fire has occurred on the receiver, lowering the equipment cost, and allowing even medium-sized or smaller equipment to have the function of identifying the area where a fire has occurred. The spread of fire alarm equipment can be made more realistic.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, a receiver 1 has a receiving function that, when receiving a fire detection signal from a sensor, decodes the fire detection signal and an address signal received at the same time to display the area where the fire occurred. Power and signal lines 2a and 2b are led out from the receiver 1, and parent detectors 3, one for each caution area, are connected in parallel to these power and signal lines 2a and 2b. Incidentally, the embodiment shown in FIG. 1 shows only one parent sensor 3 installed in a specific caution area. Furthermore, power signal lines 4a, 4b are drawn out from the parent sensor 3 to the same warning area, and a plurality of child sensors 5a, 5b, . . . are connected between the power signal lines 4a, 4b drawn out from the parent sensor 3. ...5n are connected in parallel, and a terminating resistor 6 for detecting disconnection is connected to the final ends of the power supply/signal lines 4a and 4b.

FIG. 2 is a circuit block diagram showing one embodiment of the parent sensor 3 shown in FIG. 1 together with the connection states of the child sensors 5a to 5n.

In FIG. 2, the parent sensor 3 is composed of a sensor base 3a and a sensor main body 3b, like a normal sensor, and the sensor main body 3b has a
A fire detection section 7 is provided, and an appropriate fire detection mechanism such as a photoelectric smoke detection mechanism or an ionization smoke detection mechanism is used as the fire detection section 7. On the other hand, the sensor base 3a of the parent sensor 3 is provided with a current detection circuit 8, a disconnection detection circuit 9, a transmission circuit 10, and an address setting circuit 11.

For the current detection circuit 8, the detection output (current output) of the own fire detection section 7 provided in the sensor body 3b is used.
is input, and the detection outputs (detection currents) of the child sensors 5a to 5n connected in parallel between the power supply signal lines 4a and 4b drawn out from the terminals 12a and 12b are given. The current detection circuit 8 detects the alarm current caused by the fire detection of the fire detection unit 7 or the fire detection of any of the child detectors 5a to 5n.
detects it and gives a current detection output (fire detection output) to the transmission circuit 10.

Here, the power supply signal line 2a from the receiver 1,
2b is connected to the terminals 13a and 13b of the sensor base 3a, and the sensor main body 3b equipped with the fire detection section 7 is connected to the power signal line 2a of the sensor base 3a.
It is electrically and mechanically fitted to connect the mating terminals 14a and 14b provided on the positive side power supply line, and the other side of the fire detection part 7 provided on the sensor body 3b is connected to the sensor base. 3a fitting terminal 15
electrically and mechanically connected to the In addition, a signal line 4 that also serves as a power source connects the child sensors 5a to 5n.
a, 4b are connection terminals 12a of the sensor base 3a,
12b, and the connecting terminal 12a is connected to the power line on the side of the fitting terminal 14b.

In this way, the sensor body 3b of the sensor base 3a
The reason why the fitting terminals for connecting are divided into 14a and 14b is that
This is because when the sensor is removed, the power supply to the circuit parts after the current detection circuit 8 is cut off, and at the same time, the power supply to the child sensors 5a to 5n is cut off. In this way, in the present invention, the child sensors 5a to 5 are activated only when the parent sensor 3a is functioning normally.
The child sensors 5a to 5n are configured to have a dependent relationship with respect to the parent sensor 3a so that n is valid.

Furthermore, the disconnection detection circuit 9 connects a terminating resistor 6 to the power signal lines 4a and 4b connected to the child sensors 5a to 5n.
A weak wire breakage monitoring current flowing through the wire is received via the current detection circuit 8, and when this wire breakage monitoring current is cut off, a wire breakage detection output is generated to the transmission circuit 10.

The transmission circuit 10 receives a unique sensor address setting by the address setting circuit 11, and when it receives a current detection output, that is, a fire detection output, from the current detection circuit 8, it transmits fire detection information and address information to the receiver 1. When the alarm signal is sent out and a disconnection detection output is received from the disconnection detection circuit 9, a disconnection detection signal including disconnection detection information and address information is sent to the receiver 1. Therefore, the frame structure of the transmission signal from the transmission circuit 10 to the receiver 1 is composed of a start flag, address information, fire information bit, disconnection information bit, and end flag. Of course, the frame structure is not limited to this, and any suitable frame structure can be adopted as long as it includes fire detection information and address information when a fire is detected, and address information and disconnection detection information when a disconnection is detected.

Next, the operation of the above embodiment will be explained.

First, the parent detector 3 and the child detectors 5a to 5n are installed in the same warning area, and if a fire occurs in this warning area, for example, the sensor body 3 of the parent sensor 3
If a fire is detected by the fire detection unit 7 installed in b, the sensor base 3 is activated by the fire detection unit 7.
An alarm current flows through the current detection circuit 8 provided at a, and the current detection circuit 8 provides a current detection output, that is, a fire detection output to the transmission circuit 10. The transmission circuit 10 sends the fire detection information together with the address information set by the address setting circuit 11 to the receiver 1 in a predetermined data frame configuration, and the receiver 1 that receives the signal from the parent detector 3 detects the fire detection information. The device address will be identified and the area where the fire occurred will be displayed.

On the other hand, if a fire is detected in one of the child sensors 5a to 5n, for example, the sensor 5a, the current detection circuit 8 provided on the sensor base 3a of the parent sensor 3 is When the alarm current flows and the detection output is given from the current detection circuit 8 to the transmission circuit 10, data having a predetermined frame structure including address information and fire detection information is sent to the receiver 1, and the data is sent to the receiver 1. The receiver 1 decodes the address information and identifies and displays the area where the fire occurred in the same way as when a fire is detected.

In this way, among the plurality of fire detectors installed in the same warning area, it is only necessary to provide a circuit function for transmitting the sensor address to the receiver 1 for only one parent detector 3. As for the plurality of slave detectors 5a to 5n connected in series, ordinary detectors without an address transmission function can be used as they are. Even in the case of equipment, the number of parent sensors 3 having an address transmission function can be significantly reduced, and the equipment configuration can be significantly simplified.

Further, since the child sensor, which is a normal sensor, can be connected to the connection terminal provided on the sensor base of the parent sensor, the child sensor can be easily added.

[Effects of the Invention] As described above, according to the present invention, a parent sensor is connected to a power signal line drawn out from a receiver to a guarded area, and a power source signal drawn from the parent sensor is One or more child detectors installed in the same warning area are connected to the line, and the sensor base of the parent sensor is provided with a terminal for connecting a signal line that also serves as a power source from the receiver, and the child sensor is connected to the sensor base of the parent sensor. The terminal to which the power supply/signal line is connected, the alarm current generated by the fire detection of the self-fire detection section provided in the sensor body attached to the sensor base of the parent sensor, and the power source drawn from the terminal. A current detection circuit that detects the alarm current caused by the fire detection of the secondary sensor connected to the dual-purpose signal line, an address setting circuit, and a unique address setting is received by the address setting circuit, and A transmission circuit that receives the fire detection output and sends an alarm signal containing fire detection information and address information to the receiver is installed, so one of the multiple detectors installed in the warning area Since only the sensor needs to be a parent sensor with an address signal transmission function, the equipment configuration with the fire area identification display function can be greatly simplified, and the equipment cost can be reduced, making it possible to reduce the cost compared to the conventional one. Even in the case of medium-sized or smaller fire alarm equipment, which has been slow to spread, it is easier to put into practical use equipment functions that can set a unique address for each warning area and identify and display the area where a fire has occurred on the receiver. I can do it.

There is also a large hall where multiple sensors are installed.
These can be easily set to the same address in your room, etc.

At the same time, the limited number of addresses can be used effectively.

Furthermore, since the number of addresses in the entire building is reduced, the burden on the receiver can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 2 is a circuit block diagram showing an embodiment of the parent sensor shown in FIG. 1: Receiver, 2a, 2b, 4a, 4b: Power supply signal line, 3: Parent sensor, 3a: Sensor base,
3b: Sensor main body, 5a to 5n: Child sensor, 6:
Terminal resistor, 7: Fire detection section, 8: Current detection circuit,
9: Disconnection detection circuit, 10: Transmission circuit, 11: Address setting circuit, 12a, 12b, 13a, 13
b: terminal, 14a, 14b, 15: fitting terminal.

Claims (1)

[Scope of Claims] 1. A parent sensor is connected to a power signal line drawn out from the receiver to a guarded area, and a power source and signal line drawn out from the parent sensor is connected to a 1 installed in the same guarded area. Or, a plurality of child sensors are connected in a subordinate manner, and the sensor base of the parent sensor is provided with a terminal for connecting a power signal line from the receiver and a terminal for connecting a power signal line for connecting the child sensors. and a child sensor connected to the alarm current generated by the fire detection of its own fire detection section installed in the sensor body attached to the sensor base of the parent sensor and the power supply signal line drawn out from the terminal. a current detection circuit that detects the alarm current caused by fire detection; an address setting circuit; and a unique address setting is received by the address setting circuit; A fire alarm system comprising a transmission circuit that sends out an alarm signal including fire detection information and address information.