JP3710109B2 - Repeater in fire alarm equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a repeater connected between a fire receiver and a fire detector.
[0002]
[Prior art]
In conventional fire alarm equipment, when performing an automatic test to determine whether the fire detector connected to the fire receiver is functioning normally, all of the connected fire detectors are subject to automatic testing. . That is, a fire detector having an automatic test function is connected to an R-type fire receiver via a transmission line, and a unique address different from each other is assigned to each of the fire detectors with the automatic test function. If any of the above fire detectors with automatic test function generates a failure signal, the R fire receiver individually identifies which of the fire detectors has failed. Can be identified.
[0003]
FIG. 6 is a block diagram showing a conventional fire alarm facility.
[0004]
In the above case, when the first transmission line 20R1 is connected to the R-type fire receiver 10R, and more fire detectors with automatic test functions than the number of addresses that can be assigned are connected, this transmission line 20R1. In addition to fire detectors SA1, SA2,... With automatic test function, relay CA0 is connected, and each of these fire detectors SA1, SA2,. A plurality of fire detectors SA11, SA12,... With automatic test function are connected to the repeater CA0 via the second transmission line 20R2, and between these fire detectors SA11, SA12,. By adding different addresses (you may assign addresses that overlap with those assigned to the fire detectors SA1, SA2, etc.), you can expand the number of fire detectors. That.
[0005]
[Problems to be solved by the invention]
By the way, in the surveillance area, there are areas where outside people do not like to enter more than necessary due to privacy (for example, the president's office), and areas where it is dangerous or difficult for people to enter, such areas are Since it is difficult to perform a test (inspection) even if a normal fire detector is installed, a fire detector with an automatic test function is often installed. Therefore, when the area requiring privacy protection is a part, it is sufficient to connect a fire detector with an automatic test function only to a part of the fire detector provided in the fire alarm facility. In this way, since an inexpensive general-purpose fire detector can be used in an area other than the area requiring privacy protection, the cost of the entire fire alarm system is reduced.
[0006]
However, if an address is assigned to one of the fire detectors connected to the fire receiver, and an attempt is made to communicate with that fire detector by polling, it is necessary to use an R-type fire receiver as the fire receiver. There is a problem that the cost of the fire receiver itself cannot be reduced. In other words, since the R-type fire receiver is expensive, even if the automatic test function is given only to some fire detectors, there is a problem that the fire alarm equipment is expensive as a whole. .
[0007]
The present invention can detect a fire and detect a failure even if a P-type fire receiver is used when an automatic test function is given to only some of the fire detectors in a fire alarm system. It aims at providing the repeater in the fire alarm equipment which can do.
[0008]
[Means for Solving the Problems]
The present invention includes a transmission / reception circuit that is connected to a plurality of fire detectors assigned different addresses and having an automatic test function via a transmission line and communicates with each of the fire detectors via the addresses, and the fire. Detection means for detecting a fire signal and a failure signal from a sensor, two receiver-side terminals connected to a P-type fire receiver via a P-type line, and when the detection means detects a fire signal The impedance value between the two receiver-side terminals is changed to the fire detection impedance value, while the impedance value between the two receiver-side terminals is failed when the detection means detects the failure signal. Impedance changing means that changes to an impedance value for detection, and when the detecting means detects the failure signal, at least one of the plurality of fire detectors has failed. A repeater and a failure display means for performing a fault indication indicating a.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing a repeater CA1 and its surroundings in a fire alarm facility that is an embodiment of the present invention.
[0010]
In this embodiment, two P-type lines 20P and 21P are connected to the P-type fire receiver 10P, and the general-type fire detectors SE1, SE2, SE3, SE4,. CA1 is connected, and fire detectors SA1, SA2, SA3,... With an automatic test function are connected to the repeater CA1 via a transmission line 20R. General type fire detectors SE11, SE12, SE13,... Are connected to the P type line 21P.
[0011]
The repeater CA1 is connected to a plurality of fire detectors SA1 to SA3 having an automatic test function to which different addresses are assigned via the transmission line 20R, and the fire detectors SA1 to SA3 are connected via the addresses. And a fire signal and a failure signal are sent to the P-type fire receiver 10P via the P-type line 20P.
[0012]
The fire detector SA1 with an automatic test function is assigned a unique address, can detect a failure by itself, and sends a fire signal and a failure signal to the repeater CA1. Fire detectors SA2, SA3,... With automatic test function are the same as fire detector SA1 with automatic test function.
[0013]
The automatic test includes the following two methods, and either method may be used in the present invention. The first method is to constantly monitor the analog amount of the signal sent from the fire detectors SA1 to SA3, and determine that a failure occurs when the analog amount deviates from a predetermined value. The second method is By turning on the test switch installed in the repeater, the fire detection circuit is simulated in the same state as at the time of the fire, and if a fire signal is sent at that time, the function of the fire detector is normal It is to be judged.
[0014]
FIG. 2 is a block diagram illustrating an example of the repeater CA1 according to the embodiment.
[0015]
The repeater CA1 includes a CPU 31, a fire signal transmission switching circuit 32, a failure signal transmission switching circuit 33, an impedance circuit 34 as impedance changing means, constant voltage circuits 35 and 36, and a transmission / reception circuit 37. , A display circuit 38, an operation circuit 39, a memory M, receiver side terminals T1, T2 and fire detector side terminals T3, T4.
[0016]
The CPU 31 controls the entire repeater CA1. The impedance circuit 34 has resistors R2 and R3, the resistor R2 is connected in series with the switching circuit 32, and the resistor R3 is connected in series with the switching circuit 33. Resistors R2 and R3 have different values. The CPU 31 is an example of detection means for detecting whether or not a signal determined to be a fire or a signal determined to be a failure has been received from the fire detector.
[0017]
The fire signal transmission switching circuit 32 is normally turned off, and is turned on when a signal that is judged to be a fire is received from the fire detector SA1 or the like with an automatic test function, and connects the resistor R2 to the P-type line 20P. Is. The failure signal transmission switching circuit 33 is normally turned off, and is turned on when a signal that is judged as a failure is received from the fire detector SA1 or the like with an automatic test function, and connects the resistor R3 to the P-type line 20P. Is.
[0018]
The transmission / reception circuit 37 is a circuit that communicates with the fire detector SA1 with an automatic test function via a transmission line 20R via a predetermined address. In the display circuit 38, when the transmission / reception circuit 37 detects a failure signal from the fire detector SA1 or the like with an automatic test function, at least one of the plurality of fire detectors SA1 and the like connected to the repeater CA1 has failed. Is displayed simultaneously with the switching operation of the switching circuit 33. In this case, LEDs may be provided as many as the number of fire detectors to be connected, or 7-segment display elements or LCD display elements may be used. The operation circuit 39 may send an automatic test command to the fire detectors SA1, SA2, SA3, etc. by input from here, and when an optional printer is connected to the repeater CA1, A switch for starting up the printer may be provided.
[0019]
The memory M stores the fact that the fire detector has output a failure signal, and stores the address and time of the fire detector that has output the failure signal. The contents stored in the memory M can be printed on the optional printer. The receiver side terminals T1 and T2 are terminals connected to the fire receiver P-type fire receiver 10P via the P-type line 20P. The fire detector side terminals T3 and T4 are terminals connected to the fire detector SA1 with an automatic test function through the transmission line 20R.
[0020]
FIG. 3 is a diagram showing the appearance of the repeater CA1 and the appearance of an optional printer connected to the repeater CA1.
[0021]
In FIG. 3, a switch SW is described as an example of the operation circuit 39.
[0022]
FIG. 4 is a block diagram showing a fire detector SA1 with an automatic test function connected to the above embodiment.
[0023]
The fire detector SA1 with an automatic test function includes a CPU 41, a fire detection circuit 42, an automatic test circuit 43, and a transmission / reception circuit 44. The configuration of other fire detectors with an automatic test function such as the fire detector SA2 with an automatic test function has the same configuration as the fire detector SA1 with an automatic test function.
[0024]
The CPU 41 controls the entire fire detector SA1 with an automatic test function, and the automatic test circuit 43 automatically tests whether or not the function of the fire detection circuit 42 is normal. When the fire detection circuit 42 detects a fire, the transmission / reception circuit 44 sends a fire signal together with a unique address to the R-type circuit 20R, and a failure signal indicating that the fire detection circuit 42 is in failure is an automatic test circuit 43. Is output to the R-type line 20R together with a unique address.
[0025]
Next, the operation of the above embodiment will be described.
[0026]
FIG. 5 is a flowchart showing the operation of the repeater CA1.
[0027]
First, initialization is performed (S1), signal transmission to the receiver 10P is stopped (S2), and status information is collected in the order of fire detectors SA1, SA2, SA3,... (S3). If there is a fire alarm from any of the fire detectors SA1, SA2, SA3,... (S4), a fire (alarm) signal is sent to the receiver 10P (S5). That is, the switching circuit 32 is turned on, the impedance between the receiver-side terminals T1 and T2 (impedance between the P-type line 20P) is lowered to the value of the resistor R2, and the voltage between the receiver-side terminals T1 and T2 To a voltage corresponding to the fire alarm. Note that when the restoration operation is performed on the receiver 10P side, the switching circuit 32 is turned off.
[0028]
On the other hand, if status information is collected in the order of the sensors SA1, SA2, SA3,... (S3), if a failure signal is received (S11), the failure signal is sent to the receiver 10P (S12). . That is, the switching circuit 33 is turned on, the impedance between the receiver-side terminals T1 and T2 (impedance between the P-type line 20P) is lowered to the value of the resistor R3, and the voltage between the receiver-side terminals T1 and T2 Is changed to a voltage corresponding to the failure signal. In this case, the display circuit 38 displays that a failure has occurred (S13).
[0029]
When the state information is collected in the order of the sensors SA1, SA2, SA3,... (S3), if neither a fire signal nor a failure signal is received (S11), no signal is sent, but a failure occurs in S12. If the signal has already been transmitted, the failure signal transmission to the receiver 10P is canceled (S14), and the failure display is canceled (S15).
[0030]
In this way, the P-type fire receiver 10P can receive a fire signal from the fire detector connected thereto, and the fire detectors SA1, SA2, SA3,. The failure signal from can be received via the repeater CA1. In this case, since the P-type fire receiver can be used even if an automatic test function is given to only some of the fire detectors in the fire alarm facility, the cost of the entire fire alarm facility In addition, fire detectors with an automatic test function can be arranged only in necessary portions.
[0031]
In addition, you may make it use other sensors with automatic test functions, such as a gas sensor, instead of the fire detector with an automatic test function in the said Example.
[0032]
In addition, when the fire receiver or fire signal sent from the fire detector SA1 or the like is received by the fire receiver via the repeater, the impedance value is different between the fire and the failure. It is possible to determine whether it is a fire or a failure. In the event of a fire detector failure, the fire receiver operator goes to the site where the repeater is installed, where he looks at the repeater display circuit 38 for more detailed information, ie which fire detector. It is possible to grasp whether or not a fault occurs.
[0033]
In this embodiment, the address of the faulty fire detector is displayed on the display circuit of the repeater only in the case of a fire detector. Another display circuit may be provided so that the address of the device can be displayed.
[0034]
Further, in the above embodiment, two switching circuits for fire and for failure are provided, but these may be combined into one, and in this way, an existing fire receiver can be dealt with immediately.
[0035]
【The invention's effect】
According to the present invention, when an automatic test function is given only to some of the many fire detectors in the fire alarm facility, even if a P-type fire receiver is used, fire detection and failure detection are possible. There is an effect that can be done.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a repeater CA1 and its surroundings in a fire alarm facility that is an embodiment of the present invention.
FIG. 2 is a block diagram showing an example of a repeater CA1 according to the embodiment.
FIG. 3 is a diagram illustrating an appearance of the repeater CA1 and a printer connected to the repeater CA1.
FIG. 4 is a block diagram showing a fire detector SA1 with an automatic test function connected to the embodiment.
FIG. 5 is a flowchart showing the operation of the repeater CA1.
FIG. 6 is a block diagram showing a conventional fire alarm facility.
[Explanation of symbols]
10P ... P type fire receiver,
20P ... P-type line,
20R ... Transmission line,
CA1 ... repeater,
SA1 to SA3 ... Fire detector with automatic test function,
SW1-SE4, SE11-SE13 ... General fire detectors,
31, 41 ... CPU,
32, 33 ... switching circuit,
37. Transmission / reception circuit,
38. Display circuit.

Claims (4)

Via the two receiver terminals connected to the P-type fire receiver via the P-type line to which the general fire detector is connected, the fire detector to which the address is assigned, and the transmission line In a fire alarm facility having a repeater that is connected and has a transmission / reception circuit that communicates with the fire detector via the address,
In the above fire detector,
An automatic test circuit that automatically tests whether the function of the fire detection circuit is normal and outputs a failure signal is provided.
  In the above repeater,
Detecting means for detecting whether or not a signal determined to be a failure has been received from the fire detector;
  Impedance conversion means for changing an impedance value between the two receiver-side terminals when the detection means detects a signal determined to be the failure;
Provided,
A fire alarm system characterized in that the repeater and a general fire detector are connected to the P-type line. In claim 1,
A fire for storing that the fire detector has output a failure signal is provided in the repeater, and the address and time of the fire detector that has output the failure signal are stored in the memory. Notification equipment. In claim 2,
A fire alarm facility characterized in that a printer capable of printing the contents stored in the memory is connected to the repeater. In claim 1,
A fire alarm system, characterized in that a test switch for making the same state as that at the time of a fire is provided in the fire detection circuit of the fire detector in the repeater.

Images