JP3384144B2 - Branch wiring system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch wiring system capable of detecting disconnection.

[0002]

2. Description of the Related Art As a disaster prevention / crime prevention system having a master unit as a central monitoring unit and a plurality of speakers, sensors, etc. that operate based on control signals from the master unit, a feed wiring system and a multiplex transmission wiring system are known. is there. This feed wiring system is a system that directly connects the master unit and each terminal device with the main wire, but in the actual construction site, since the wire is wired from each terminal device side to the master device side, It is necessary to connect to a terminal device using one wire and to feed wiring to a terminal device different from that, and as a result, a 4-core wire is required, which makes the wire expensive. . In addition, the multiplex transmission wiring system transmits / receives multiplex transmission signals between the master unit and each terminal device having an address, but the master unit and the terminal units are expensive for transmitting / receiving multiplex transmission signals. Has become.

In order to improve these, a branch wiring system is sometimes used. This is to connect the master unit as a central monitoring device, the terminals such as a plurality of speakers and detectors that operate based on the control signal from the master unit, and the master unit and the plurality of terminals. A branch wire formed by a main electric wire connected to the parent device and an auxiliary electric wire for each terminal device connecting the main electric wire and each terminal device.

[0004]

Although the above-described branch wiring system can be made cheaper than other wiring systems, when a disconnection occurs only in some auxiliary wires or terminals. Since there is no abnormality in other auxiliary electric wires or terminals, the parent device cannot detect the disconnection, which may cause inconvenience when using this system.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a branch wiring system capable of detecting when a disconnection occurs in an auxiliary electric wire or a terminal device in a parent device. That is.

[0006]

In order to solve such a problem, a branch wiring system according to claim 1 has a master unit as a central monitoring device and a plurality of terminals operating based on a control signal from the master unit. And a main unit, which connects the master unit and a plurality of terminals, and is formed by a main electric wire connected to the master unit and an auxiliary electric wire for each terminal connecting the main electric wire and each terminal unit. In a branch wiring system having a branch wiring,
The master unit has a signal generation unit for generating a test signal for instructing a test for detecting disconnection, and a test signal output unit for outputting the test signal to the branch wiring is provided, and the test signal is received on the auxiliary electric wire A disconnection monitoring unit is provided, which has a disconnection detection unit that detects the presence or absence of a disconnection on the secondary side of the secondary side, and a short-circuit signal output unit that outputs a detection signal of the disconnection detection unit to the master unit as a short-circuit signal. I am trying.

Further, in the branch wiring system according to claim 2, the short circuit signal output part according to claim 1 is formed of a relay contact for short-circuiting the primary side of the auxiliary electric wire on the basis of the detection signal of the disconnection detection part. It is configured.

According to a third aspect of the present invention, in the branch wiring system, the signal generating section of the test signal output means according to the first aspect is:
The test signal including the frequency component in the non-audible range is formed, and the disconnection detection unit of the disconnection monitoring unit is provided with a signal selector that inputs only the signal including the frequency component in the non-audible range.

[0009]

According to the structure of the first aspect, the disconnection monitoring means is provided in the auxiliary electric wire, so that the disconnection monitoring means receives the test signal of the test signal output means of the master unit, and the disconnection detection section detects the test signal. The presence / absence of a disconnection on the secondary side of the disconnection monitoring means is detected, and when the disconnection is detected, the short circuit signal output unit outputs a short circuit signal to the master unit, so that the master unit can easily detect the disconnection of the branch wiring. .

According to the second aspect of the invention, in addition to the operation of the first aspect, a short circuit signal is output by short-circuiting the relay contacts in conjunction with the detection signal of the disconnection detecting section, which is simple. With this configuration, a short circuit signal can be output.

Further, according to the configuration of claim 3, in addition to the operation of claim 1, the parent device outputs a test signal composed of frequency components in the inaudible range, so that the disconnection detecting section can output the test signal. Is detected and the presence or absence of disconnection on the secondary side of the disconnection monitoring means is detected.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a partial block diagram of a branch wiring system according to the present invention, which has a main unit 1, a terminal unit 3, a branch wiring 4, and a disconnection monitoring unit 7, which will be described later, as main constituent members.

The master unit 1 is a central monitoring device and monitors and controls a terminal unit 3 which will be described later. For example, the parent device 1 is for emergency broadcasting from the terminal device 3 at the time of an abnormality such as a fire, and at the time of an abnormality, outputs a control signal composed of an AC component waveform for broadcasting. The master unit 1 also includes a signal creation unit 2a that creates a test signal composed of a waveform of a DC component for instructing a test for detecting disconnection of the auxiliary electric wire 6 and the terminal 3 described later. And has a test signal output means 2 for outputting the test signal to a branch wiring 4 described later.

The terminal units 3, 3 ... Operate based on a control signal from the base unit 1, for example, each room of the building A.
It is composed of the speaker installed in B and broadcasts emergency according to the control signal.

The branch wiring 4 is for connecting the master unit 1 and the terminals 3, 3, ..., And is a two-wire type main wire 5 connected to the master unit 1, the main wire 5, and the terminals 3. , 3 ... and two-wire type auxiliary electric wires 6, 6 ,.

The disconnection monitoring means 7 detects the disconnection on the 2 o'clock side based on the output signal of the test signal output means 2 of the master unit 1, and is provided in the middle of the auxiliary electric wires 6, 6. This disconnection monitoring means 7 is used when the test signal is received.
It has a wire breakage detection unit 8 that detects the presence or absence of wire breakage on the secondary side, and a short circuit signal output unit 9 that outputs the detection signal of the wire breakage detection unit 8 to the master unit as a short circuit signal. Disconnection detector 8
The next side disconnection is judged by whether or not there is continuity, and when there is no continuity, it is regarded as a disconnection and the detection signal is short-circuited.
Output to 9. The short-circuit signal output unit 9 has a relay contact 10 that short-circuits the primary side of the auxiliary electric wire based on the detection signal, and the relay contact 10 transmits the short-circuit signal to the master unit 1.

This is the test signal output means 2 of the base unit 1.
When a test signal is output, the disconnection detection unit 8 of the disconnection monitoring means 7 receives the test signal and detects the presence or absence of disconnection on the secondary side. If there is a disconnection, the short circuit signal output unit 9 outputs a short circuit signal. To the base unit 1. As a result, the parent device 1 detects the short circuit signal, so that it is known that the branch wiring system has a disconnection, and it is possible to take measures. Further, when the control signal is output from the master device 1, the disconnection monitoring means 7 can be directly passed and the emergency broadcast can be performed from the terminal device 3, that is, the speaker. Since the short circuit signal can be recognized as a change in current, the parent device 1 can easily determine.

Next, the second embodiment of the present invention will be described with reference to FIG.
It will be described based on. In this embodiment, the test signal output means
The configurations of 2 and disconnection monitoring means 7 are different from those of the first embodiment.

The signal producing section 2a produces a test signal composed of frequency components in the inaudible range. This test signal has a frequency component of 20 kHz or less, and the control signal for emergency broadcast has a frequency component in the audible range, which is different from that. When it is desired to detect a disconnection on the secondary side of the disconnection monitoring means 2, the test signal output means 2 outputs it to the branch wiring 4.

Reference numeral 12 denotes a disconnection detecting section of the disconnection monitoring means 7,
A low-pass filter 13 as a signal selector that passes only signals of frequency components in the inaudible range, a coil 14, and a coil 14.
The first contact 15 and the coil 14 which are closed when a current flows through
And a second contact 16 that opens when a current flows through it.
The disconnection detection unit 12 also serves as a short circuit signal output unit 17 that transmits a short circuit signal to the parent device 1 when there is a disconnection. Furthermore, 18 is a high-pass filter, which is 5 for emergency broadcast.
A control signal composed of frequency components in the audible range of 0 kHz or higher passes.

This is the test signal output means 2 of the master unit 1.
When a test signal composed of a frequency component in a more inaudible range is output, it passes through the low-pass filter 13 of the disconnection monitoring means 7 and the coil 14, and when the secondary side of the disconnection monitoring means 7 is not disconnected, the first The contact 15 continues to be closed, and the test signal drops in voltage at the terminal 3 and returns to the master 1. On the other hand, when the secondary side of the disconnection monitoring means 7 is disconnected, the first contact
While the 15 and the second contact 16 cause chattering, a pulsed short-circuit signal is generated and transmitted to the master unit 1. as a result,
Since the main unit 1 detects the short circuit signal, it can be understood that the branch wiring system has a disconnection, and the countermeasure can be taken. When the master unit 1 outputs a control signal composed of frequency components in the audible range, the high-pass filter 18 of the disconnection monitoring means 7
The emergency broadcast can be made from the terminal 3, that is, the speaker through the.

As described above, by using the test signal in the inaudible range, it becomes easy to distinguish it from the control signal in the case of an emergency broadcast system.

Although the main unit and the terminal device have been described as being used in the emergency broadcast system, the present invention is not limited to this, and any system using branch wiring such as a smoke sensor as the terminal device may be used. Can be used.
Further, although the disconnection monitoring means is provided on the auxiliary electric wire, it may be provided on the main electric wire.

[0024]

In the branch wiring system according to the first aspect of the present invention, the disconnection monitoring means is provided in the auxiliary electric wire so that the disconnection monitoring means receives the test signal of the test signal output means of the master unit and detects the disconnection detection section. Detects the presence or absence of disconnection on the secondary side of the disconnection monitoring means, and when the disconnection is detected, the short circuit signal output section outputs a short circuit signal to the master unit, so that the master unit can easily detect the disconnection of the branch wiring. Therefore, reliability is improved.

In addition to the effect of claim 1, the branch wiring system according to claim 2 is simple in that a short circuit signal is output when the relay contact is short-circuited in conjunction with the detection signal of the disconnection detection section. Since a short circuit signal can be output with such a configuration, the cost can be reduced.

According to the branch wiring system of the third aspect, in addition to the effect of the first aspect, the parent device outputs the test signal composed of the frequency component in the inaudible range, and the disconnection detecting section detects the test signal. Is detected and the presence or absence of disconnection on the secondary side of the disconnection monitoring means is detected. Therefore, when used in emergency broadcast equipment, the signal is composed of frequency components in the audible range during emergency broadcast, so disconnection is not detected and normal Broadcasting will improve usability.

[Brief description of drawings]

FIG. 1 is a partial block diagram of a branch wiring system showing a first embodiment of the present invention.

FIG. 2 is an overall block diagram of the branch wiring system.

FIG. 3 is a partial block diagram of a branch wiring system showing a second embodiment of the present invention.

[Explanation of symbols]

1 base unit 2 Test signal output means 2a Signal generator 3 terminal 4 branch wiring 5 Main wire 6 Auxiliary wire 7 Disconnection monitoring means 8 Disconnection detector 9 Short circuit signal output section 10 relay contacts 13 Signal selector (low-pass filter)

Continuation of the front page (56) Reference JP-A-52-132798 (JP, A) JP-A-2-292698 (JP, A) JP-A-58-5074 (JP, A) Sekikaihei 3-119298 (JP , U) Actual development Sho 50-80385 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G08B 29/06 H04B 3/46

Claims (3)

(57) [Claims] 1. A master unit as a central monitoring device, a plurality of terminal devices that operate based on a control signal from the master unit, and a master unit and a plurality of terminal devices that are connected to the master unit. In a branch wiring system having a main wire and a branch wire formed by an auxiliary wire for each terminal connecting the main wire and each terminal, a test for detecting disconnection in the parent device is performed. A test signal output unit that outputs a test signal to the branch wiring is provided with a signal creation unit that creates a test signal to be instructed, and the auxiliary wire has a disconnection on the secondary side when the test signal is received. A branch wiring system comprising: a disconnection detection unit for detecting a disconnection detection unit; and a disconnection monitoring unit that outputs a detection signal of the disconnection detection unit to the master unit as a short-circuit signal output unit. 2. The branch wiring system according to claim 1, wherein the short-circuit signal output unit is formed of a relay contact that short-circuits the primary side of the auxiliary electric wire based on the detection signal of the disconnection detection unit. 3. The signal generating section of the test signal output means is formed so as to generate a test signal composed of frequency components in the inaudible range, and the disconnection detecting section of the disconnection monitoring means,
2. The branch wiring system according to claim 1, further comprising a signal selector that inputs only a signal having a frequency component in an inaudible range.