JP3770550B2 - Processing equipment after short circuit recovery in fire alarm equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing apparatus after recovery from a short circuit in a fire alarm facility.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is known a fire alarm facility in which a fire receiver and a terminal device are connected by a signal line, and predetermined information is transmitted and received between the fire receiver and the terminal device through a digital signal via the signal line.
[0003]
In this conventional example, an H signal (for example, 35V) and an L signal (for example, 20V) are generated in the transmission circuit of the fire receiver, and a digital signal is generated by combining the H signal and the L signal, and is transmitted to the terminal device. Send it out. Similarly, in the transmission circuit of the terminal device, an H signal (for example, 35V) and an L signal (for example, 20V) are generated, a digital signal is generated by combining the H signal and the L signal, and fire reception is performed. To the machine. The signal line is composed of two lines, one signal line is the hot side, the other signal line is the ground side, and there is a Zener diode and a switching transistor between the hot side and the ground side. A series circuit is connected. When the switching transistor is turned off, the hot side becomes 35V, and the H signal is output to the signal line. When the switching transistor is turned on, the hot side becomes 20V regulated by the Zener diode, and the L signal becomes the signal line. Is output.
[0004]
[Problems to be solved by the invention]
In the above conventional example, when the switching circuit provided in the transmission circuit of the terminal device has failed and has been kept on, the receiver input signal is always seen from the reception circuit of the fire receiver. The determination result is the same as in the case of the L signal, and it cannot be determined whether the terminal device actually transmits the L signal or whether the switching circuit in the transmission circuit of the terminal device is faulty. If the state is left as it is, there is a problem that the time during which an overcurrent flows in the Zener diode connected in series with the transistor becomes long, wasteful power is consumed, and the Zener diode may be destroyed.
[0005]
An object of the present invention is to provide a transmission abnormality detection device in a fire alarm facility capable of detecting that a transistor constituting a transmission circuit of a terminal device has reached a short circuit state due to an abnormality.
[0006]
By the way, when a transmission abnormality such as a short circuit occurs in the signal line connecting the fire receiver and the repeater, the power is turned off once, and then the power is turned on every 1 minute to recover from the short circuit. If so, the power is turned on. As a result, troubles caused by transient short circuits are removed. In this case, the control content for controlling the controlled device is stored in the RAM provided in the repeater, but since the power is turned off, the information on the control content held in the RAM when the power is turned off. Disappears in an instant. Thus, when the information of the control content held in the RAM is lost, there is a problem that the repeater stops the control of the controlled device halfway.
[0007]
In the present invention, the fire receiver stops supplying power to the terminal device such as a repeater due to a short circuit of the power / signal line, and the terminal device can quickly capture the information held before the short circuit after the short circuit is recovered. It aims at providing the processing apparatus after the short circuit recovery in the fire alarm equipment which can be done.
[0008]
[Means for Solving the Problems]
In the present invention, a repeater is connected to a receiving unit via a power / signal line, the repeater stores the control content for the controlled device, and the receiving unit stores the control content for the controlled device related to the repeater, The receiver detects a short circuit by measuring the voltage of the power / signal line, and after detecting this short circuit, the receiver cuts off the power supply to the power / signal line and re-supplies the power at predetermined time intervals. In a fire alarm facility that continuously supplies power to the power / signal line when the receiving unit no longer detects a short circuit, the short circuit is detected and the power supply is shut off, and then the power is continuously supplied. When this happens, the receiver sends out the control details for the controlled device stored in the receiver before the power supply is stopped to the repeater, and the repeater takes in the sent control details. .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing an embodiment of the present invention.
[0010]
In FIG. 1, the fire receiver RE and the terminal device T are connected by a pair of power and signal lines L1 and L2. The terminal device T is a terminal device such as a repeater or a fire detector, and a plurality of terminal devices T are connected to one fire receiver RE.
[0011]
The fire receiver RE includes a microcomputer MPU1, constant voltage circuits AVR11, AVR12, constant current circuit CC, transistors Tr11, Tr13, Tr14, Tr15, Tr17, Tr18, comparators CM1, CM2, CM3, and a Zener diode ZD11. , ZD12, and ZD13.
[0012]
The constant voltage circuit AVR11 supplies a constant voltage (H signal supply voltage) of 34V, for example, and the constant voltage circuit AVR12 supplies a voltage of 21V (L voltage supply voltage), for example.
[0013]
The constant current circuit CC has a constant value for supplying power necessary for the terminal device T from the constant voltage circuit AVR11 by turning on the transistor Tr11 when the terminal device T returns a signal to the fire receiver RE. In this circuit, the current flows to the terminal device T when the signal is returned. The constant current circuit CC allows a constant current to flow to the terminal device T, thereby restricting a voltage drop due to the line resistance of the power / signal lines L1 and L2 when a signal is returned from the terminal device T. When the Tr 22 is turned on, the Zener diode ZD22 and the transistor Tr22 are protected.
[0014]
The transistors Tr13 and Tr17 are switching circuits that are turned on when an H voltage signal is sent and turned on at a signal return timing from the terminal device T. The transistors Tr14 and Tr18 are switching circuits that are turned on when the fire receiver RE sends an L voltage signal to the terminal device. When the fire receiver RE is turned on, the output voltage (L voltage signal) of the constant voltage circuit AVR12 is turned on. This is supplied to the terminal device T.
[0015]
The comparator CM1 compares the voltage V1 of the power / signal line L1 connected to the fire receiver RE side with the Zener voltage of the Zener diode ZD11, thereby returning a return signal (signal of the power / signal line). Is an H voltage signal or an L voltage signal.
[0016]
The short-circuit detection comparator CM2 compares the voltage V1 of the power / signal line L1 connected to the fire receiver RE side with the Zener voltage (for example, 10V) of the Zener diode ZD12, and the voltage V1 of the power / signal line is If the zener voltage is lower than 10V, a short circuit signal indicating that the power / signal lines L1 and L2 are short-circuited is output.
[0017]
The inverter INV inverts the short circuit signal output from the short circuit detection comparator CM2.
[0018]
The transmission abnormality detection comparator CM3 compares the voltage V1 of the power / signal line L1 connected to the fire receiver RE side with the Zener voltage (for example, 34V) of the Zener diode ZD13, and the voltage V1 of the power / signal line. Is lower than the Zener voltage of 34 V, it is determined that there is a possibility that the transistor Tr22 constituting the transmission circuit of the terminal device T is in a short-circuited state.
[0019]
The AND circuit A1 receives the output signal of the transmission abnormality detection comparator CM3 and the output signal of the inverter INV, and when the transmission abnormality detection comparator CM3 outputs the H signal and the inverter INV also outputs the H signal. A circuit for generating a transmission abnormality signal.
[0020]
The terminal device T includes a constant voltage circuit AVR21, a microcomputer MPU2, transistors Tr21 and Tr22, and Zener diodes ZD21 and ZD22. The constant voltage circuit AVR21 supplies the voltages of 36V and 21V supplied from the constant voltage circuits AVR11 and AVR12 of the fire receiver RE via the power / signal lines L1 and L2, respectively, to the terminal device T side. It is a constant voltage circuit converted into (for example) and supplied.
[0021]
The circuit including the Zener diode ZD21 and the transistor Tr21 constitutes a comparison circuit that determines whether the signal transmitted from the fire receiver RE is an H voltage signal or an L voltage signal. That is, if the voltage V2 at the terminal t21 is equal to or higher than the Zener voltage of the Zener diode ZD21, the transistor Tr21 is turned on, and by detecting this on state, it can be determined that the signal from the fire receiver RE is an H voltage signal. .
[0022]
The transistor Tr22 is a switching transistor for the terminal device T to return an L voltage signal to the receiver RE. When the transistor Tr22 is turned on, the Zener voltage of the Zener diode ZD22 is converted into an L voltage signal as terminals L21 and t22 (also serving as a power source). Signal line L1, L2).
[0023]
When the terminal device T is a repeater, a fire detector, a fire prevention device, a smoke prevention device, or the like is connected to the repeater.
[0024]
Next, the operation of the above embodiment will be described.
[0025]
First, various initial settings are performed, the transistor Tr11 is turned on, and if it is necessary to send a signal to the terminal device T, the bit information to be sent is read. If the level of the bit to be sent is L, the transistor Tr14 Is turned on and the transistor Tr13 is turned off. After a predetermined time has elapsed, the transistor Tr13 is turned on and the transistor Tr14 is turned off. On the other hand, if the level of the bit to be transmitted is H, the transistor Tr14 is turned off and the transistor Tr13 is kept on.
[0026]
FIG. 2 is a time chart showing the operation of the above embodiment.
[0027]
The transmission period I1 in which the fire receiver RE sends a signal to the terminal device T ends while repeating the above-described operations regarding the levels H and L, and the fire receiver RE receives a signal from the terminal device T after the suspension period I2. The reception period I3 starts.
[0028]
In the above embodiment, when the power / signal lines L1 and L2 are short-circuited, the short-circuit detection comparator CM2 applies the voltage V1 of the power / signal line L1 connected to the fire receiver RE to the zener diode ZD12. Compared with a zener voltage (for example, 10V), the short circuit signal indicating that the voltage V1 of the power / signal line is lower than the zener voltage of 10V and the power / signal lines L1, L2 are short-circuited is detected. Output from the comparator CM2. This short-circuit signal is input to port P16 of MPU1.
[0029]
Next, a case where a transmission abnormality occurs due to a short circuit of the transistor Tr22 constituting the transmission circuit of the terminal device T will be described.
[0030]
When the transistor Tr22 constituting the transmission circuit of the terminal device T is short-circuited, the transmission abnormality detection comparator CM3 uses the voltage V1 of the power / signal line L1 connected to the fire receiver RE side as the zener voltage of the zener diode ZD13. Compared with 34V, the voltage V1 of the power / signal line is lower than the Zener voltage of 34V, so the transmission abnormality detection comparator CM3 outputs an H signal. At this time, since the power / signal lines L1 and L2 are not short-circuited, the comparator CM2 outputs an L signal, and this L signal is inverted to an H signal by the inverter INV. Therefore, the AND circuit A1 outputs an H signal. In other words, the AND circuit A1 outputs a transmission abnormality signal, and this transmission abnormality signal is input to the input port P17 of the MPU1. Therefore, the MPU 1 can recognize that the transistor Tr22 constituting the transmission circuit of the terminal device T is in a short-circuited state, thereby causing a transmission abnormal state.
[0031]
In this case, the MPU 1 determines whether or not the transmission abnormality signal is input from the AND circuit A1 during the idle period I2 between the transmission period I1 and the reception period I3. Thus, the reason for determining the presence / absence of a transmission abnormality signal in the pause period I2 is that the determination is easier than determining the presence / absence of a transmission abnormality signal in a period other than the pause period I2. That is, when a short circuit detection circuit is provided and it is detected that the short circuit state is not detected, it is only detected that the voltage V1 is lower than 34V that is the Zener voltage of the Zener diode ZD13 (the voltage V1 is a transmission abnormal voltage). This is because a transmission abnormality can be detected.
[0032]
If the short circuit detection circuit is not provided, the transmission abnormality is not detected until it is detected that the voltage V1 is lower than the Zener voltage 34V of the Zener diode ZD13 and higher than the allowable voltage of the low signal of the digital signal. It can be detected.
[0033]
In any case, in the above embodiment, the fire receiver transmits the digital signal in the fire alarm facility in which the fire receiver and the terminal device are connected by the signal line and the digital signal is transmitted through the signal line. In the idle period I2, which is a period between the period I1 and the reception period I3 in which the fire receiver receives the digital signal from the terminal device, the voltage of the signal line is the high signal allowable voltage VH and the digital signal. It is detected that the voltage is lower than a predetermined voltage between the low signal allowable voltage VL (the transmission abnormal voltage VT2).
[0034]
Also, in a fire alarm facility in which a fire receiver and a terminal device are connected by a signal line and a digital signal is transmitted via the signal line, a transmission period I1 in which the fire receiver sends out a digital signal, In the idle period I2, which is a period between the reception period I3 when the fire receiver receives the digital signal, the voltage of the signal line is set to the allowable voltage VH of the high signal of the digital signal and the allowable voltage VL of the low signal of the digital signal. It may be detected that the voltage is between (the abnormal transmission voltage VT1).
[0035]
Note that the presence / absence of a transmission abnormality signal may be determined in a period other than the idle period I2 (transmission period I1, reception period I3). That is, when the voltage of the signal line is a voltage between the allowable voltage of the high signal of the digital signal and the allowable voltage of the low signal of the digital signal, it may be determined that a transmission abnormality has occurred.
[0036]
When the MPU 1 determines that a transmission abnormality has occurred, the MPU 1 displays the transmission abnormality on a display means (not shown) of the fire receiver RE and turns off the transistors Tr13 and Tr14 to connect to the terminal device T. Shut off the power supply.
[0037]
The fire receiver RE in the above embodiment may be considered as a repeater, that is, a receiver may be considered instead of the fire receiver RE.
[0038]
FIG. 3 is a block diagram showing another embodiment of the present invention.
[0039]
This embodiment is basically the same as the embodiment shown in FIG. 1, wherein a repeater C is provided in place of the terminal device T, and a controlled device CM is connected to the repeater C. The device C is obtained by adding an interface I / F and a memory M to the terminal device T shown in FIG.
[0040]
In the embodiment shown in FIG. 3, when the power / signal lines L1 and L2 connecting the fire receiver RE and the relay C are short-circuited, the power supply to the relay C is cut off, and then the power is continuously supplied. , The fire receiver RE sends the control contents for the controlled device CM stored in the fire receiver RE before the power supply stop to the repeater C. The contents are captured by the repeater C.
[0041]
Next, the operation of the embodiment shown in FIG. 3 will be described.
[0042]
FIG. 4 is a flowchart showing the operation of the embodiment shown in FIG.
[0043]
First, if the relay C is connected to the fire receiver RE via the power / signal lines L1 and L2, and the relay C has contents to be controlled with respect to the controlled device CM (S1), the relay C is related. The fire receiver RE stores the control content for the controlled device (S2), and the repeater C also stores the control content for the controlled device CM.
[0044]
Thereafter, when the fire receiver RE detects a short circuit of the power / signal lines L1 and L2 by measuring the voltage of the power / signal lines L1 and L2 (S3), after detecting the short circuit, the power / signal line L1 When the fire receiver RE shuts off the power supply to the L2 (S4) and repeats the supply of power again at one minute intervals, and the fire receiver RE no longer detects a short circuit (S4, S5, S6) ), Continuously supplying power to the power / signal lines L1 and L2, and the fire receiver RE sends the control contents to the relay C to the controlled device CM stored in the fire receiver RE before the power supply is stopped. Sending out (S7), the repeater C takes in the sent control contents.
[0045]
Then, after the repeater C fetches the control details for the controlled device CM from the fire receiver RE, the control details for the fetched controlled device CM and the control details for the controlled device CM stored in the fire receiver RE are stored. (S8), and the repeater C executes the fetched control content (S9).
[0046]
Therefore, according to the embodiment shown in FIGS. 3 and 4, when the short circuit is detected and the power supply is cut off, and then the power supply is continuously supplied, the receiving unit stores the power before the power supply is stopped. Because the fire receiver RE sends out the control details for the controlled device to the repeater C, and the repeater C takes in the sent control details, a fire occurs due to a short circuit of the power and signal lines L1 and L2. The power supply to the terminal device such as the repeater C is cut off by the receiver, and after the short circuit is recovered, the relay device C and the like can quickly capture the information held by the terminal device before the short circuit.
[0047]
In the flowchart shown in FIG. 4, the operation of collating the control content of the controlled device CM stored in the fire receiver RE with the control content captured by the repeater C (S8), and the repeater C executes the captured control content. Either or both of the operations (S9) may be omitted.
[0048]
In addition, the control content with respect to the to-be-controlled device CM is the control content regarding at least 1 among the main sound ringing, district sound ringing, and starting of smoke prevention apparatus.
[0049]
The embodiment shown in FIG. 3 relates to the repeater C, but a fire detector may be used instead of the repeater C. That is, a fire detector is connected to a receiving unit such as a fire receiver RE via a power / signal line, the fire detector stores predetermined information, and the receiving unit stores information stored in the fire detector. On the other hand, the receiver detects a short circuit by measuring the voltage of the power / signal line, and after detecting this short circuit, the receiver stops supplying power to the power / signal line and turns the power on at predetermined intervals. In the fire alarm facility that continuously supplies power to the power / signal line when the receiver stops detecting a short circuit when it is re-supplied, it detects the short circuit and shuts off the power supply. When the power supply is to be supplied, the information stored in the fire detector before the power supply is stopped may be sent to the fire detector by the receiving unit, and the information sent by the fire detector may be taken in. .
[0050]
【The invention's effect】
According to the present invention, the power supply to the terminal device such as the repeater is interrupted by the fire receiver due to the short circuit of the power / signal line, and the information held by the terminal device before the short circuit is quickly taken in after the short circuit is recovered. There is an effect that can be.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a time chart showing the operation of the embodiment.
FIG. 3 is a block diagram showing another embodiment of the present invention.
4 is a flowchart showing the operation of the embodiment shown in FIG. 3;
[Explanation of symbols]
RE ... Fire receiver,
T: Terminal equipment,
C ... Repeater,
CM2: comparator for short circuit detection,
CM3: Transmission abnormality detection comparator,
Tr22... Transistor constituting the transmission circuit of the terminal device,
M ... memory,
CM: Controlled device.

Claims (5)

A repeater is connected to a receiving unit such as a fire receiver via a power / signal line, the repeater stores the control content for the controlled device, and the control content for the controlled device related to the repeater is received by the receiving unit. On the other hand, the receiving unit detects a short circuit by measuring the voltage of the power / signal line, and after the short circuit is detected, the receiving unit cuts off the power supply to the power / signal line. In a fire alarm facility that continuously supplies power to the power and signal line when the power supply is re-supplied at predetermined time intervals and the receiving unit no longer detects a short circuit,
When the short circuit is detected and the power supply is cut off, and then the power supply is continuously supplied, the control content for the controlled device stored in the reception unit before the power supply stop is A processing apparatus after recovery from a short circuit in a fire alarm facility, wherein the receiving unit sends out to the repeater and the repeater takes in the transmitted control content. In claim 1,
After the repeater captures the control content for the controlled device from the receiving unit, the control content for the captured controlled device is collated with the control content for the controlled device stored in the receiving unit. The processing apparatus after the short circuit recovery in the fire alarm facility characterized by this. In claim 1 or claim 2,
The processing apparatus after recovery from a short circuit in a fire alarm facility, wherein the repeater executes the fetched control content after the repeater fetches the control content for the controlled device from the receiving unit. In any one of Claims 1-3,
The control content for the controlled device is a control content related to at least one of main sound, district sound, and smoke control device, and the processing device after recovery from a short circuit in a fire alarm facility. A fire detector is connected to a receiver such as a fire receiver via a power / signal line, the fire detector stores predetermined information, and the receiver stores information stored by the fire detector. On the other hand, the receiving unit detects a short circuit by measuring the voltage of the power / signal line, and after detecting this short circuit, the receiving unit cuts off the power supply to the power / signal line for a predetermined time. In the fire alarm facility for supplying power continuously to the power / signal line when the power is re-supplied to the power / signal line at an interval and the receiver no longer detects a short circuit,
When the short circuit is detected and the power supply is cut off, and then the power is continuously supplied, the information stored in the fire detector before the power supply is stopped is received by the receiving unit. A processing apparatus after recovery from a short circuit in a fire alarm facility, characterized in that the fire detector sends out the information sent out to the fire detector.

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