JP3988108B2 - Fire alarm repeater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
For example, in a fire alarm facility, the present invention is connected between a signal line from a fire receiver and a controlled device such as a district sound device or smoke control device, and the controlled device is connected by a start signal from the fire receiver. It relates to a repeater to be activated.
[0002]
[Prior art]
Conventionally, as a repeater for fire alarm equipment, the power source superimposed on the signal line from the fire receiver cannot drive controlled devices such as district acoustic devices and smoke control equipment. The transmitted activation signal is received, a relay is operated based on the activation signal, an external power source is supplied to the controlled device, and the controlled device is activated.
In addition, the conventional fire alarm equipment repeater is provided with a disconnection monitoring circuit or the like in order to detect disconnection of the control line to which the controlled device is connected. Connected, a weak current is always passed through the control line, and the disconnection of the control line is monitored by detecting the disconnection by the change of the current.
[0003]
[Problems to be solved by the invention]
The conventional fire alarm equipment repeater operates the relay to supply external power to the controlled device and activates the controlled device, but for the relay contact movement, the relay was activated. In some cases, it was assumed that the contact operated normally, so the operation of the relay contact was not detected.
Therefore, if the relay contact is not operating even though the relay is operated, the fire receiver side actually determines that the controlled device is activated. Has a problem that the controlled device may not be activated.
[0004]
For this reason, it is conceivable that a circuit for confirming the operation of the relay is separately provided, and the change of the voltage on the controlled device side during the relay operation is monitored by the circuit to confirm the operation of the relay. However, there is a problem that the number of parts increases.
[0005]
In addition, the operating power supply for each circuit, including the drive of the relay in the repeater, uses the power supply superimposed on the signal line from the fire receiver. When the relay is operated in a low state during repetition, there is a problem in that the relay may not respond because the voltage level for operating the relay is low.
[0006]
The present invention has been made to solve such a problem, and it is an object of the present invention to provide a repeater capable of detecting the operation of a relay contact with a simple circuit without increasing the number of parts. Objective.
[0007]
[Means for Solving the Problems]
The repeater of the fire alarm facility according to the present invention is connected to the signal line from the fire receiver, and when receiving a start signal from the fire receiver, supplies power to the controlled device via the control line, A relay for fire alarm equipment that activates equipment, a relay that is connected to a signal line and transmits / receives data to / from a fire receiver, and a relay that supplies power to the controlled equipment via the control line during operation Monitoring the disconnection of the control line via the relay having the contact and the contact on the non-operating side of the relay contact, detecting the disconnection state when the control line is disconnected when the relay is not operating, and also during the operation of the relay A disconnection monitoring means for detecting a disconnection state, and a control means connected to the transmission means, the relay and the disconnection monitoring means and controlling the operation of the repeater, the control means is a fire from the starting receiver via the transmission means Receive the signal and After operating the over, in response to an output of the detection signal disconnection state from the disconnection monitoring means relay contact is switched to the operation side from the non-operating side, it is to verify the operation of the relay contacts.
[0008]
Further, control means, when the relay is to operate by receiving the activation signal from the fire receiver via the transmission means, to operate the relay without timing of the transmission signal to the signal line.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a repeater of a fire alarm facility according to an embodiment of the present invention.
In the figure, L is a signal line, which is connected to a fire receiver (not shown), and is connected as one of a plurality of connected terminal devices.
Reference numeral 1 denotes a transmission circuit which is connected to a fire receiver via a signal line L and receives data such as a start signal and transmits state information.
Reference numeral 2 denotes a constant voltage circuit, which supplies a predetermined voltage to each part in the repeater using a voltage superimposed on the signal line L as a power source.
[0010]
3 is an address setting unit for setting the address of the repeater, 4 is a control unit (MPU) for controlling the operation of the entire repeater, 5 is a disconnection monitoring circuit, E1 is a relay, and e1 is a relay contact of the relay E1. Yes, the relay contact e1 of the relay E1 is connected to the b side when the relay E1 is not operating and to the a side when the relay E1 is operating.
Here, the disconnection monitoring circuit 5 constantly monitors the state of the control line Lt by causing the monitoring current to flow through the control line Lt (the state on the b side) via the relay contact e1, and the monitoring current stops flowing. Then, it is detected that the control line Lt is in a disconnected state.
[0011]
Lt is a control line, and T is a device to be activated by supplying an external power supply to the control line Lt, for example, a controlled device such as a smoke prevention device. R is a termination resistor.
As described above, the transmission circuit 1, the constant voltage circuit 2, the address setting unit 3, the control unit (MPU) 4, the disconnection monitoring circuit 5, the relay E1, and the relay contact e1 of the relay E1 constitute a relay.
[0012]
Next, the operation of this embodiment will be described.
First, the normal operation of the repeater will be described.
(1) Signal transmission with a fire receiver (not shown) is always performed, and a response signal is returned in response to a call signal from the receiver.
(2) When a start signal is received from a fire receiver (not shown), the controlled device T is started. That is, the control unit 4 of the repeater operates the relay E1 to switch the contact e1 from the b side to the a side. Then, external power is supplied to the device T via the control line Lt, and the device T is activated.
[0013]
(3) When the relay contact e1 is switched, the disconnection monitoring circuit 5 detects and outputs as a disconnection state.
Here, the disconnection state to be detected is not the actual disconnection of the control line Lt, but the disconnection monitoring circuit 5 detects that the monitoring current stops flowing due to the switching of the relay contact e1 (state on the side a) as the disconnection state. Output.
[0014]
(4) The control unit 4 confirms the starting operation. That is, the output from the disconnection monitoring circuit 5 is received by the control unit 4, and the output from the disconnection monitoring circuit 5 after the output for actuating the relay E1 is the activation confirmation output.
Here, the activation confirmation output is determined together with the control to the relay E1, that is, from the disconnection monitoring circuit 5 in the case of the disconnection state before the control to the relay E1. However, the controlled device T cannot be controlled.
Of course, when the relay E1 is not activated, it is an output that is originally being monitored for disconnection, so it is of course determined that the output is a disconnection detection output.
[0015]
Next, the operation when disconnection of the repeater occurs will be described.
(1) The disconnection monitoring circuit 5 always supplies a monitoring current to the control line Lt via the relay contact e1 (b-side state).
(2) When the control line Lt is disconnected, the monitoring current does not flow. At that time, the disconnection monitoring circuit 5 detects that no monitoring current is generated, and outputs it to the control unit 4.
(3) The control unit 4 recognizes a disconnection state based on the output of the disconnection monitoring circuit 5 when the relay E1 is not controlled, and is in a disconnected state as a response signal to the call signal from the fire receiver. A signal indicating that this is returned.
[0016]
At this time, the monitoring current flows only to the control line Lt via the termination resistor R and does not flow to the controlled device T due to the diode D. Therefore, even when a plurality of controlled devices T are controlled by one control line Lt, disconnection can be detected with the same monitoring current. The control line Lt may be terminated with a so-called terminator such as a capacitor other than a resistor or a Zener diode. Further, the monitoring current is not always necessary and may be intermittent.
[0017]
Thus, in this embodiment, the disconnection monitoring circuit at the time of operation of the relay E1 using the output of the disconnection monitoring circuit 5 that monitors the presence or absence of the control output to the relay E1 and the disconnection of the control line L to the controlled device. By using the output of 5 as the start confirmation output of the relay contact e1, the operation of the relay contact e1 can be confirmed with a simple circuit configuration and a small number of parts.
Note that the relay E1, the relay contact e1, the control line L, and the disconnection monitoring circuit 5 may be one line, and the control unit 4 may monitor and control a plurality of lines.
[0018]
Embodiment 2. FIG.
This embodiment controls the timing for operating the relay E1 in the first embodiment, and the configuration and operation of the other relays are the same as those in the first embodiment.
[0019]
Next, the operation of this embodiment will be described.
First, the form of signal transmission with the fire receiver will be described.
FIG. 2 is a diagram schematically illustrating a signal form of information collection in transmission between the fire receiver and the terminal device.
First, when collecting information from each terminal device, the fire receiver receives a response from a plurality of terminal devices belonging to the group by specifying a group by point boring.
[0020]
Here, a plurality of terminal devices connected to the fire receiver via the signal line L are grouped. For example, when up to 255 addresses can be assigned to the terminal devices, it is divided into 16 groups. Within one group, up to 16 terminal devices belong. Each terminal device can calculate in advance the group to which it belongs and its rank within the group from its own address.
[0021]
In the point polling frame, the fire receiver first designates a group (AD position) and transmits a call signal (CM position) in combination. This is the receiver field in terms of timing.
[0022]
In response to this, the terminal devices in the corresponding group sequentially respond with status information (RE position) together with the self address (AD position). At this time, based on the ranking within the group, the data is output individually so as not to overlap. This is the terminal device field in terms of timing.
These are combined to form one transmission frame.
As described above, the state information of each terminal device can be easily collected by causing a plurality of terminal devices to respond to one call signal.
[0023]
Next, the start timing of the repeater will be described.
FIG. 3 is a diagram schematically showing a signal form of the activation signal from the fire receiver to the repeater.
The activation signal from the fire receiver is not a point boring but a selecting form, and this selecting is a form for directly controlling one terminal device by specifying an address. .
[0024]
In the frame, first, the fire receiver designates a terminal device, which is a controlled device to be activated, by an address (AD position), and sends out a combination of activation signals (CM positions). This is a receiver field similar to FIG. 2 in terms of timing.
[0025]
On the other hand, the terminal device with the corresponding address responds with a response signal (RE position) together with its own address (AD position) as confirmation of the received content. This response signal may be the same as the activation signal as the information content, but in detail, since the activation signal includes the primary sum check code and the response signal includes the secondary sum check code, the signal content is confirmed.
[0026]
In the selecting frame, the frame length is the same as that at the time of point polling and the terminal device field is short.
Therefore, when operating the relay E1, the control unit 4 of the repeater of this embodiment performs the start-up operation of the relay E1 with the state where the transmission signal is not superimposed on the signal line as the terminal control timing.
Therefore, there is no transmission signal on the signal line, the relay E1 can be operated when the voltage supplied to the relay E1 is stable, and the relay E1 can be reliably operated when the activation signal is received.
[0027]
In selecting, the margin at the rear of the terminal device field may be short, and the terminal control timing may be performed in the gap of the transmission signal, etc., so there is no need to perform point polling or selecting. do not do. However, it is preferable that the timing has a wide margin.
[0028]
【The invention's effect】
As described above, according to the present invention, when the activation signal from the fire receiver is received via the transmission means, the relay is operated, and then the relay contact is switched from the non-operation side to the operation side, the disconnection monitoring means Since the operation of the relay contact is confirmed by receiving the output of the detection signal of the disconnection state, the operation of the relay contact can be confirmed with a simple circuit configuration and a small number of parts.
[0029]
In addition, when operating the relay by receiving the start signal from the fire receiver via the transmission means, the relay is operated at the timing when there is no transmission signal on the signal line, so the voltage supplied to the relay is stable In this case, the relay can be operated, and the relay can be reliably operated when the activation signal is received.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a repeater of a fire alarm facility according to an embodiment of the present invention.
FIG. 2 is a diagram schematically showing a signal form of information collection in transmission between a fire receiver and a terminal device.
FIG. 3 is a diagram schematically showing a signal form of a start signal from a fire receiver to a repeater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission circuit 2 Constant voltage circuit 3 Address setting part 4 Control part (MPU)
5 Disconnection monitoring circuit E1 Relay e1 Relay contact Lt of relay E1 Control line T Controlled device

Claims (2)

When connected to a signal line from a fire receiver and receives a start signal from the fire receiver, a power supply is supplied to the controlled device via the control line, and the relay device of the fire alarm facility starts the controlled device. ,
A transmission means connected to the signal line for transmitting and receiving data to and from the fire receiver;
A relay having a relay contact for supplying power to the controlled device via the control line during operation;
The disconnection of the control line is monitored via the contact on the non-operating side of the relay contact, and the disconnection state is detected when the control line is disconnected when the relay is not operating, and the disconnection state is also generated when the relay is operating. Disconnection monitoring means for detecting
Connected to the transmission means, the relay and the disconnection monitoring means, and comprising a control means for controlling the operation of the repeater,
The control means receives an activation signal from the fire receiver via the transmission means, operates the relay, and then the relay contact is switched from the non-operation side to the operation side . A relay for a fire alarm system , wherein the relay contact is confirmed by receiving an output of a disconnection detection signal. Wherein, when operating the relay by receiving the activation signal from the fire receiver via the transmission means, wherein, wherein the operating the relay without timing of the transmission signal to the signal line Item 1. Fire alarm equipment repeater.

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