JPH0827873B2 - Repeater for self-warming system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a repeater for a fire alarm system.

BACKGROUND ART FIG. 2 shows an overall schematic configuration diagram of a self-warning information system, in which a plurality of repeaters 3 ₁ are connected to a receiver 1 via a transmission line 2.
... connect, each repeater 3 ₁ ... connecting the sensor S line
L ₁ ... is connected.

The repeater 3 is composed of a concrete circuit as shown in FIG. 3, and the repeater 3 operates by the power source sent from the receiver ₁ , and the transmission line 2 ₁ from the receiver ₁ 2 ₂ , 2 ₃
Is accessed by a multiplex transmission signal composed of clock pulse CP1, clock pulse CP2, transmission data DP, etc. sent via
a, when the set address 5b of the address setting portion 8 match, the connected line L _1, L ₂ ... detector via the transmission line 2 ₄ alarm information S in return signal RD to the receiver 1 of Send it back. Each line
L _1, L ₂ ... the signal processing circuit 5a through a signal coupling circuit 4 ₁ ... corresponding to each are connected to 5b, a signal combining circuit 4 ₁ ...
Have the same circuit configuration. For example, the signal combination circuit 4 ₁
In line L ₁ , Zener diode ZD ₁ , resistor R ₁ and parallel circuit of light emitting diode LED ₁ of photocoupler IC ₁ and resistor R _1
2, a diode D _2, the power supply + 24V from the contact A ₁ and sensing power supply for line 9 ₁ via the relay contact r ₁ is supplied. When the sensor S connected to the line L ₁ is turned on, the power supply + 24V, the diode D ₁ , the resistor R ₁ and the parallel circuit of the light emitting diode LED ₁ of the photocoupler IC ₁ and the resistor R _{1 are connected} .
_2, a diode D _2, the contact point A ₁ of the relay contact r _1, output to the photocoupler IC ₁ a current flows in the circuit of the sensor S is incorporated in the output signal processing circuit 5a occurs, the receiver 1
It is sent back as alert information when accessed from.

The signal combining circuit 4 ₁ ... attention to the relay contact r ₁ ... contact B ₁ ... side of which is provided to switching the relay contact r ₁ ... to contact B ₁ ... side for the line L ₁ ... disconnection monitoring Due to line L ₁
It is designed to stop the energization of the relay contact r ₁
... is a relay contact of a two-winding type latching relay Ry ₁ ..., and these latching relays Ry ₁ ... are signal processing circuits 5a, 5b.
Signal is set and reset via the relay drive circuits 6a and 6b. When the control signal for the disconnection test is transmitted from the receiver 1 to the repeater 3 during the disconnection detection test of the line L _1, ..., the signal processing circuits 5a and 5b operate the relay drive circuits 6a and 6b, and the latching relay Ry ₁ ... Is set and the relay contacts r ₁ ... are switched from the contact A ₁ ... side to the contact B ₁ ... side. Wherein the signal coupling circuit 4 ₁ relay contact r ₁
There turns on the transistor Tr ₁ charged charge flows to the base of the transistor Tr ₁ in the end capacitor 7 of the line L ₁ which is connected to the switched to the contact B ₁ side. This turning on also turns on transistors Tr ₂ and Tr ₃ , power supply + 24V, diode D
₁ , Zener diode ZD ₁ , transistor Tr ₁ , resistor R ₃ ,
A current flows in the circuit of the light emitting diode LED ₂ of the photocoupler IC ₂ , and a current flows in the parallel circuit of the power supply + 24V, the diode D ₁ , the resistor R ₁ and the light emitting diode LED ₁ , the resistor R ₂ and the transistor Tr _3. Outputs of both photocouplers IC ₁ and IC ₂ are generated, taken into the signal processing circuits 5a and 5b, and returned to the receiver 1 as disconnection information. That is, if there is no disconnection, an output is generated in the photocoupler IC ₂ as described above, and if there is a disconnection, a current path for discharging the charge of the terminating capacitor 7 is not formed, so an output is generated in the photocoupler IC _2. I don't.

By the way, the driving power of the latching relay Ry ₁ ... Is supplied from the power source line 9 _{2 for the} repeater through the diode D ₆ which is the voltage of + 12V which is the constant voltage of the Zener diode ZD ₂ and is charged to the capacitor C _1. It is something. Then, the voltage of the capacitor C ₁ is connected to another Zener diode ZD ₃ via the resistor R _10, and is made a constant voltage to a lower voltage to charge the capacitors C ₂ and C ₃ , and the charging voltage is processed by the signal processing described above. It is supplied as a power source for the circuits 5a and 5b. Here the capacitor C _2, C ₃ a charging current supplied by the voltage rectified by the clock pulses CP1, CP2 and transmission data DP respectively diode D ₁₀ to D _12. Therefore, repeater power line 9 ₂
Even if a disconnection occurs in the capacitor, the capacitors C ₂ and C ₃ are charged, and the charging voltage is applied to the signal processing circuits 5a and 5b. Since the signal processing circuits 5a and 5b are composed of CMOS ICs with low current consumption, they operate normally. Therefore, when the above-mentioned disconnection test is performed during disconnection of the repeater power supply line 9 ₂ , the latching relay Ry is generated by the charging current of the capacitors C ₂ and C ₃ because the set time of the latching relays Ry ₁ ... Is as short as 1 msec.
₁ ... can operate normally.

But above phenomenon is when the number of repeaters 3 power line 9 ₂ breaks is small, the disconnection in many repeaters 3 occurs, less driving power by the clock pulses CP1, CP2 and transmission data DP and , Repeater 3 side capacitor
As the total capacitance of C ₂ and C ₃ increases, the signals of the transmission data DP and the clock pulses CP1 and CP2 are distorted (especially when driving the latching relay Ry ₁ ...) Therefore, the repeater 3 that receives these signals Then, the distorted signal is not regarded as a normal signal and the return signal RD is not returned to the receiver 1. If the receiver 1 does not receive the return signal RD, it is determined that the relay 3 is abnormal.

The number of repeaters 3 was broken for one reason that such a power supply line 9 ₂ disconnection, different become phenomena, though and when operating the system so as not nothing wrong, as described above It may be judged as abnormal.
Even further when the power supply line 9 ₂ small number of repeaters 3 was disconnected, the distortion of the signal transmitted from the receiver 1 appears not a little, is correct for the decrease in the noise resistance by increasing the permissible to strain There is also a problem of causing. Note Figure 2 of 9 ₃ is a common ground line.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to perform a disconnection test control which causes a waveform distortion of a signal when a disconnection of a power line for a repeater occurs. Shut off the driving power of the latching relay for the power supply, and operate the signal processing circuit of the repeater normally with the power from the transmission line.
Another object of the present invention is to provide a repeater for a fire alarm system capable of returning disconnection information of a repeater power line to a receiver.

DISCLOSURE OF THE INVENTION In the present invention, a clock pulse, an address, and a control signal are transmitted from a receiver, and a transmission signal for transmitting a return signal to the receiver, a power line for a sensor, a power line for a repeater, and a ground line. Is connected at least, the power supplied from the power supply line for the sensor is connected, and the line to which the terminating capacitor is connected is connected to the end, and the address transmitted from the receiver normally matches the set address. Sometimes, the alarm information of the sensor connected to the line is sent back to the receiver as a return signal via the transmission line, and when the signal for the control of the disconnection test is transmitted from the receiver, it is inserted in series at the beginning side of the line. The control latching relay for disconnection test with a relay contact is controlled to turn off the relay contact to shut off the power supply to the line, and to check the discharge state of the charge stored in the terminating capacitor. In the repeater of the fire alarm system equipped with a signal processing circuit that has a control and monitoring function that determines the presence or absence of disconnection of the main line and returns the disconnection information as a return signal via the transmission line, connect the power line for the repeater to a diode. Via a power supply means for supplying a power to the signal processing circuit by connecting to a capacitor for power supply via a Zener diode connected to the capacitor to charge the charging voltage of the capacitor via a power supply means; On the connection side, the drive power supply path of the disconnection test control latching relay is connected to the power supply wire for the repeater via another diode on the connection side, and power supply means for supplying power to the drive power supply path is provided. is there.

FIG. 1 shows a specific circuit diagram of the repeater of the present embodiment. This circuit shows a line connected to the drive power supply path of the latching relays Ry ₁ ... In the circuit of FIG. 3 via a diode D ₅ . in that connected to the relay power supply for line 9 ₂ Te differs from the Figure 3 circuit.

When Thus to relay power supply for line 9 ₂ is disconnected, the capacitor
Since the power supply from the C ₁ , C ₂ and C ₃ sides is blocked by the diode D _6, no power is supplied to the latching relay Ry ₁ ... side, and here the transmission data of the disconnection test is transferred to the signal processing circuit 5a. , the relay drive circuit 6a receives 5b is a latching relay Ry ₁ ... driving current be operated to 6b do not work latching relays Ry ₁ ... does not flow. Therefore relay contact r ₁ ...
Does not switch from A ₁ ... to B ₁ ..., the same situation as the line L ₁ ... disconnection occurs, and the signal processing circuits 5a and 5b return the return signal RD as disconnection information. Since there is no operation of the latching relay Ry _1, ..., the power supply by the signals from the transmission lines 2 ₁ , 2 ₂ , 2 ₃ also consumes less power, and the waveform distortion does not occur in the signals. The circuits 5a and 5b receive signals such as transmission data as normal signals and return the return signal RD.

Since the receiver 1 issues a disconnection test command to the repeater 3 at a rate of once in 10 minutes, for example, even if the repeater power supply line 9 ₂ is disconnected, the line L ₁ ... It can be received as disconnection information, and it is possible to perform reliable maintenance management.

EFFECTS OF THE INVENTION The present invention is configured as described above, the power supply line for the repeater is connected to the power supply capacitor via the diode, and the charging voltage of the capacitor is made constant by the Zener diode connected to the capacitor. The power supply means for supplying power to the signal processing circuit, and the drive power path of the disconnection test control latching relay to the repeater power supply line through another diode on the connection side between the diode and the repeater power supply line. Since the power supply means for supplying power to the driving power supply path is provided, the power supply path of the disconnection test control latching relay can be cut off from the capacitor in the event of a disconnection of the power supply wire for the repeater. Even if the power line for the repeater is broken in the repeater, the signal processing circuit can operate properly only by supplying power with the signal sent through the transmission line. In addition, the signal waveform distortion does not occur, and when the disconnection test command signal is given from the receiver as transmission data, the disconnection test control latching relay does not operate and the power supply for the repeater is used as line disconnection information. It is possible to return the disconnection of the wire to the receiver side, and to reliably transmit the disconnection of the power source wire for the repeater to the receiver side.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a schematic overall configuration diagram of a fire alarm system, and FIG. 3 is a circuit diagram of a conventional example, in which 1 is a receiver, 2 ₁ , 2 ₂ ... Is a transmission line, 3 is a repeater, and 5a and 5
b is a signal processing circuit, 9 ₁ is a power line for a sensor, 9 ₂ is a power line for a repeater, Ry ₁ ... is a latching relay, D _{2 to} D ₆ are diodes, C _{1 to} C ₃ are capacitors, ZD ₁ and ZD ₂ Is a Zener diode, CP1 and CP2 are clock pulses, and DP is transmission data.

Claims (1)

[Claims] 1. A transmission signal for transmitting a clock pulse, an address and a control signal and a return signal to the receiver, a power line for a sensor, a power line for a repeater,
At least the ground line is connected, the power supplied from the sensor power line is connected, and the line to which the terminating capacitor is connected is connected to the end, and the address transmitted from the receiver is normally the set address. When they match, the alarm information of the sensor connected to the line is sent back to the receiver as a return signal via the transmission line, and when the signal for the control of the disconnection test is transmitted from the receiver, it is serially connected to the beginning side of the line. Controlling the disconnection test control latching relay with the inserted relay contact to turn off the relay contact to shut off the power supply to the line, and determine the presence or absence of line disconnection from the discharge state of the charge stored in the termination capacitor. In the repeater of the fire alarm system, which has a signal processing circuit having a control and monitoring function for returning disconnection information as a return signal via the transmission line, the power supply line for the repeater is Power supply means for connecting to a capacitor for power supply through an ode, for making the charging voltage of the capacitor a constant voltage by a Zener diode connected to the capacitor and supplying power to the signal processing circuit, and the power supply line for the diode and the repeater And a power supply means for supplying power to the drive power supply path by connecting the drive power supply path of the disconnection test control latching relay to the relay power supply line through another diode on the connection side with Repeater for the self-warming system.