JPS5926986B2 - fire notification system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire notification system installed in high-rise buildings, underground malls, etc., and aims to improve reliability.

A conventional system of this type has a configuration as shown in FIG. 1, for example.

In FIG. 1, s (s 11 , +812...
・SNM is standard type, fire detector such as thermal type, A1.13
2...ln is a receiving line, P is a receiver, and Q is an alarm device.

When a fire occurs in this configuration, smoke or heat is detected and the sensor S issues a fire signal.

The receiver P receives the fire signal from the detector and sends the alarm device Q.
Transfer to.

The alarm device Q automatically or semi-automatically generates an alarm sound in response to a fire signal, and also makes an emergency broadcast.

In this case, multiple sensors S are connected in parallel to each line, but the number of sensors S connected is controlled for each line (for example, 2 sensors per line).
(up to 0), many reception lines are required in high-rise buildings and large underground malls.

Furthermore, since the number of sensors S increases in proportion to the number of lines, the MTBF of the entire system gradually decreases, resulting in a disadvantage of lower reliability.

Also, for example, if the X point shown in the figure is a disconnection or the sensor Su
If the detectors S1 m were to fail, it would be difficult to find the faulty part because the sensors were connected in parallel, and there was even a risk that the discovery of a fire would be extremely delayed.Furthermore, for example, if a wire breaks at point There was a risk that even if a fire broke out in the warning area covered by the personnel, it would not be detected at all.

The present invention aims to eliminate these drawbacks and provide a highly reliable fire notification system.

Examples of the present invention will be described below. In FIG. 2, SS, □, SS1□, . . . S S nm are analog detectors that detect smoke, heat, fire, etc.

Usually, in order to simultaneously detect smoke and heat or smoke and fire, a composite detector is used in which two or more conversion elements are housed in one detector.

Note that the detection signal is encoded (digitized) using a PCM method or the like and output.

R,,R2,. . . . , Rn is a repeater, l11.
l12. . . . lln is a loop type detection line.

A plurality of detectors are connected in parallel to the detection line.

For example, the detection line l11 has detectors S S+ 1 to S S
+ rn and S S nt to S S nm are connected in parallel to lln, respectively.

The transmission uses a pulse force type (digital transmission), and the transmission control uses an address polling method from a repeater.

PP is a receiver, and LL is a loop-type relay line.

A plurality of repeaters R1, R2, . . . are connected to the relay line LL.
..., Rn are connected in parallel.

The transmission is a pulse type, and the transmission control uses an address polling method from the receiver.

Here, each repeater R1, R2, . Failure information, repeater failure information, detected line failure information, etc. are sent out.

The receiver PP is mainly in charge of transmission control, and each repeater R1...
...Transfers information collected from Rn and relay line failure information to alarm device QQ.

The alarm device QQ makes a fire judgment based on the detection information, and if it is determined that a fire has occurred, it automatically or semi-automatically outputs an alarm sound, warning broadcast, evacuation guidance broadcast, etc., and when the failure information is transferred. The system displays the failure location and failure details, and automatically outputs a failure warning sound.

Next, transmission route switching control for the loop-type detection line and relay line will be explained.

The same switching control method is used for both the detection line and the relay line.

FIG. 3 is an explanatory diagram of line switching control, 1.2.・・・・・・
, respectively, are child devices (detectors or repeaters in this embodiment), 1', 2',...l K' are child devices 1, 2-...K, respectively. The transmission control section provided inside, 11 is a loop line, C is a sharp device (in this example, a repeater or receiver), and R is a relay for switching transmission route (A
, B is a relay contact), D/R is a line driver/receiver, and CCT is a transmission control section in the sharp instrument.

Normally, the loop line ll and D/R are connected through an A contact.

When the sharp device C collects information from the child device, the CCT collects information from the child device 1.
Polling is performed in order from

In this case, a call code (at trace code assigned to each slave unit) is output to the line, and the transmission control unit of the slave unit (1', 2', . . .
..., ni′) is activated.

The transmission control section of the slave device (1', 2',...-2'
) are connected in parallel to line 11), so they receive the call codes at the same time.

After receiving the call code, it compares its own address code, and only if they match, returns its own address and transmits detection information and failure information to sharp instrument C.

In this case, although the details are omitted, if the address does not match the own address, the device enters a waiting state so that only the next call code can be received, and it is not able to respond to communication with other child devices and sharp devices. is controlled.

Further, the transmission control unit CCT of the sharp device C repeats the same polling up to three times if a response to polling is not returned within a certain period of time or if a transmission error such as a parity error occurs.

If there is no response to polling or if transmission errors occur three times in a row, transmission control unit CCT switches transmission route switching relay R, connects 11 and D/R at contact B, and performs the same polling.

If an error occurs three times in a row in this state,
It is determined that the line is disconnected or the detector is malfunctioning.

Therefore, since a separate address code is assigned to each slave device, if no response to polling occurs six times in a row, only the slave device in question can be determined to be faulty.

Further, in FIG. 3, for example, if a wire breaks at point X, it cannot be distinguished from a slave device failure, so it is still considered to be a slave device failure.

If the Y point is disconnected, slave unit 1 can communicate from the B contact side, and slave unit 2 to slave units can communicate from the A contact side, so the system function will not be lost and the disconnection point can be easily removed. Can be discovered.

The same applies when the Z point is disconnected.

In the present invention, the line transmission route switching control and transmission control method described above are adopted between the detector and the repeater, and between the repeater and the receiver, so even if the line is disconnected, the system The fire monitoring function of the system will not deteriorate.

In addition, since line breakage points and failure detectors can be discovered early, early repair is possible, and the repair rate is improved for the same failure rate, which has the advantage of greatly improving the reliability of the entire system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional fire notification system, Fig. 2 is a block diagram of a fire notification system according to an embodiment of the present invention, and Fig. 3 is a block diagram of a fire notification system according to an embodiment of the present invention.
The figure is a configuration diagram of a transmission route switching control section. S S 11 S S nrn ・””’Detector, l
i! ,~lln...-Detection line, R1-Rn
...Repeater, 1,2~K...Slave device, l
ll...loop line, C...sharp instrument.

Claims (1)

[Claims] 1. In response to address polling from a repeater, the self-address is returned only when it matches the self-address, and when there is a mismatch, it waits in a state where only the next address poll can be received. A plurality of fire detectors each having a digital transmission control function that cannot respond to communications between the detectors and repeaters; a loop-shaped digital transmission line connecting these detectors and the repeaters; The repeater has a transmission route switching function for switching both ends of the transmission line and a transmission control function, and when there is no response to address polling, the transmission route is switched and address polling is repeated, and the address after switching the transmission route is A fire reporting system characterized in that the location of a line breakage and the failure detector are determined based on the presence or absence of a return. 2. The fire notification system according to claim 1, characterized in that a plurality of repeaters are connected in parallel to a loop-shaped transmission line connected to a receiver.