JPH04160499A - Signal detection device for disaster prevention facility - Google Patents

Abstract

PURPOSE:To prevent wrong alarming and wrong control from being caused by a noise signal by deciding that a received signal is a fire signal, a sent signal such as a control signal, a detection object signal such as a switch input signal, or the noise signal according to whether or not the received signal continues for a specific time. CONSTITUTION:The states of remaining input ports IN2 - IN4 are read in order unless a counter t1 reaches a specific value T1. When the signal state is H every time the state of the input port IN1 is read, namely, when a comparator CM1 receives a signal, the counter t1 counts up by one each time the state is read. Here, when it is judged that the value of the counter t1 reaches the specific value T1, the comparator CM1 receives the signal for a specific time, so it is judged that a correct signal, i.e. the fire signal is detected. Consequently, a microcomputer MPU sets output ports OUT1 and OUT3 to H to turn on a 1st area pilot lamp L1 and displays a fire occurrence area, a main bell MB is driven to indicate the fire occurrence, and an area bell which is not shown in a figure is put in sounding operation while fire prevention doors, etc., are controlled.

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a signal detection device installed in equipment of disaster prevention equipment such as receivers and repeaters of fire alarm equipment, and relates to a signal detection device installed in equipment of disaster prevention equipment such as fire alarm equipment receivers and repeaters. The present invention relates to a signal detection device that can determine whether an input signal such as a switch signal from a similar device is a correct signal or a noise signal such as induced noise.

[Subject skill]

2. Description of the Related Art Devices of disaster prevention equipment, such as fire receivers, repeaters, and fire detectors of fire alarm equipment, are provided with signal detection devices, that is, signal detection circuits, that detect various signals.

For example, the fire receiver includes fire information signals (hereinafter referred to as fire signals) such as fire signals and physical quantity signals of fire phenomena sent from fire detectors, repeaters, etc.; A signal detection circuit that detects a status signal indicating the status of a control device from a signal line, and a signal detection circuit that detects input signals such as on/off signals of various switches provided on an operation panel are provided.

When the fire signal detection circuit that detects a fire signal detects a signal flowing through the signal line, it determines that it is a fire signal from a fire detector that has detected a fire, and generates a detection output, which allows the fire receiver to locate the area where the fire occurred. In addition to identifying and displaying the fire warning area, it also controls the district bell to notify fire orders, and furthermore, it can display controlled equipment such as fire doors, smoke prevention equipment, fire extinguishing equipment, etc. related to the fire warning area. is controlled via a repeater, etc.

In addition, the signal detection circuit that monitors the switch status is
When an input signal from a switch is detected, it is determined that there is an input from the corresponding switch, and a detection output is generated, which is used to perform a test or control a controlled device.

[Issues we are trying to solve]

By the way, when these signal detection circuits detect a signal, they immediately determine that the signal is a fire signal or a switch input signal and produce a detection output, so noise signals such as induced noise that are input via signal lines etc. There is a problem in that the detection output is determined to be a fire signal or a switch input signal, and as a result, a false alarm or erroneous control is performed.

This point also applies to signal detection devices of terminals such as fire detectors and repeaters.

[Means to solve the problem]

In view of the above points, the present invention aims at a signal detection device for disaster prevention equipment that can distinguish between noise signals and transmission signals such as fire signals flowing through signal lines, switch input signals, and noise signals. In a signal detection device installed in equipment of disaster prevention equipment, a receiving means for receiving a signal, and a determining means for determining whether or not the receiving means has been receiving the signal for a predetermined period of time when the receiving means receives the signal. and a detection means that determines that a signal has been detected when the determination means determines that a signal has been received for a predetermined period of time.

Further, the present invention is characterized in that the determining means is configured to operate when the receiving means receives a signal, and after a predetermined time, determine whether or not the receiving means is receiving the signal.

[For production]

When the receiving means receives a signal from a signal line or switch,
It is determined whether the received signal continues for a predetermined time (for example, 10 ms), and when it is determined that the signal continues for a predetermined time, it is determined that the correct detection target signal such as a transmission signal or switch input signal has been received. Therefore, the influence of noise signals can be removed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment in which the present invention is applied to a fire receiver, which is one of the devices of disaster prevention equipment, where RE is the fire receiver, DE is the fire receiver, and the power and signal line 1+ is connected to the RE. I
The fire detector connected through g, ER is a terminating resistor.

In the fire reception 11RE, MPU is a microcomputer for signal processing, INI to IN4 are input ports, 0
UTI to 0UT3 are output ports. In a storage section (not shown) of the microcomputer MPU, a signal detection/discrimination program shown in the flowchart of FIG. 2 is stored together with various programs for fire area discrimination, control, etc. CMI and CM2 are comparators for receiving fire signals as receiving means for transmission signals, SWl and SW2 are non-locking fire recovery switches and main sound stop switches, R1 and R
2 is a resistor for detecting a switch signal. Ll and L2 are district indicator lights, MB is a main bell as a main sound device, and B is a relay for controlling the main bell MB.

Note that the comparators CMI and CM2 constitute the receiving means for the fire signal, that is, the transmission signal, the resistors R1 and R2 and the microcomputer MPU constitute the receiving means for the switches SWI and SW2, and the microcomputer MPU constitutes the discriminating means and the detecting means, respectively. ing.

Further, the fire receiver RE is provided with various circuits such as a fire test circuit, a continuity test circuit, a district sound control circuit, and various related switches, but these are not shown.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG.

When a power switch (not shown) is turned on or a reset switch is operated, initial settings such as setting various constants to initial values are performed (step Sl), and k is set to O (step S2).

Next, k is incremented by 1 (step S3), and the input port r
The state of Nk, in this case the state of comparator CM1, is read (step S4), and its output state is Hl, that is, signal l1l11. If the comparator CMI is not in the H state (N in step S5), the timekeeping microcomputer M P U (D Note tj
1. Set the counter tk provided in the section to 0 and clear it (step S6). Then, it is determined whether k has reached a predetermined value K (4 in this embodiment), and if it has not reached K, (N in step S7) k is incremented by 1 (step S3) next input port)) Read the signal state of INk (step S4), and when K has been reached (Y in step S7) In order to return to reading the signal state of INl, k is set to 0 (step S2).

By the way, when the fire detector DE in the first fire warning area detects a fire and operates, and a fire signal flows through the signal line l, the comparator CMI goes into the H output state.

When the H output state of this comparator CMI is read from the input port [N1 (Y in step S5), the corresponding counter t1 is incremented by 1 (step 5ll), and the value of the counter t1 determines whether a fire signal has been received. Predetermined value Tk for
It is determined whether or not this has been reached (step 512). In addition,
The predetermined value T1 corresponding to the counter t1 is, for example, 10 ms.
corresponds to (directly selected)

If the value of the counter t1 has not reached the predetermined value T1 (N in step S12), the remaining input ports IN2 to IN4
Read the status of (steps 82 to S7)
.

Then, each time the state of the input port IN1 is read, if the signal state is H, that is, if the comparison RW CMl is receiving the signal (Y in steps S4 and S5), the counter t
1 is incremented by 1 for each read (step 511
). When it is determined that the value of the counter t1 has reached the predetermined value TI (Y in step S13), the comparator CMI receives the signal for a predetermined period of time and therefore determines that it has detected a correct signal, that is, a fire signal (in step S13). Y) Do it.

As a result, the microcomputer MPU sets the output ports 0LIT1 and 0UT3 to H, turns on the first district indicator light L1 to display the district where the fire occurred, and turns on the main bell MB.
The fire alarm will ring to notify the outbreak of a fire, and a district bell (not shown) will be rung, and if necessary, fire doors, smoke prevention equipment, etc. will be controlled. II+ Control equipment.

By the way, due to noise signals such as induced noise, the comparator C
Even when MI produces an H output (Y in step S5), the counter t1 repeats the increment operation (step 511) while the comparator CMI is in the H output state, but the duration of the noise signal is longer than the fire signal. Since it is relatively short, the counter t1
Before the value reaches a predetermined value (iTl), the output of the comparator CMI becomes L (N in step S5), the counter [1 is cleared (step S6), and the district indicator light L1 and main bell MB
etc. does not work.

Further, when the input port IN2, that is, the counter t2 of the comparator CM2 reaches a predetermined value T2 (YS3 of step 312)
13 N% 315 Y), output ports 0UT2 and 0UT
3 is set to H, the district indicator light L2 and the main bell MB are operated (step 316), and the input port IN3, that is, the counter t3 of the fire recovery switch SWI is set to a predetermined value T3.
(7% of step S12, N% of S13, S15)
(N, S17, Y), temporarily cut off the power supply to the sensor DE, restore it, and output (output) OUTI, 0U.
T2 and 0UT3 are set to L and district indicator lights L1, L
2 and the operation of the main bell MB is stopped (step 518).
, input port IN4, that is, main sound stop switch SW2
When the counter L4 reaches the predetermined value T4 (step S1
2 Y, S13 N.

(N in S15, N in S17), output capo OUT3 is set to L, and the ringing operation of the main bell MB is stopped (step 516).

Note that the predetermined time for the counter tk (aTk, that is, the predetermined time for discrimination for each signal) may be common to the detection target signal or may be set to a separate and different time, or a dip switch or the like may be provided to set the predetermined time. If the predetermined time is selected in this manner, it is possible to select the optimum determination time that matches the duration of the noise signal at the installation location.

In addition, time determination of detection target signals such as fire signals and switch signals can be performed using, for example, a timer that starts operating upon reception of a signal, performs an open operation while receiving the signal, and generates an output when a predetermined period of time has elapsed. You may also do so.

Incidentally, in the above embodiment, a signal detection device for a fire receiver has been described, but the same applies to a signal detection device provided in equipment of disaster prevention equipment such as a repeater or a fire detector.

[Effect] According to the present invention, when a signal is received, depending on whether the signal continues for a predetermined period of time, the detection target signal such as a transmission signal such as a fire signal or a control signal or a switch/7-inch input signal is detected. Since the signal detecting device determines whether the signal is a noise signal or a noise signal, a signal detection device for disaster prevention equipment that does not cause false alarms or erroneous control due to noise signals can be obtained.

[Brief explanation of the drawing]

1rEJ is a block diagram of an embodiment in which the present invention is applied to a fire receiver, which is one of the devices of disaster prevention equipment, and FIG. 2 is a flowchart explaining its operation. RE...Fire receiver, DE...Fire detector, MPU...Microcomputer, CMI, CM2...Comparator, SWI, SW2...Switch.

Claims (1)

[Scope of Claims] 1. A signal detection device installed in equipment of disaster prevention equipment, comprising: receiving means for receiving a signal; and when the receiving means receives the signal, the receiving means receives the signal for a predetermined period of time. A signal detection device for disaster prevention equipment, comprising: a determination means for determining whether a signal is received for a predetermined period of time; and a detection means for determining that a signal has been detected when the determination means determines that a signal has been received for a predetermined period of time. . 2. In a signal detection device installed in a device of disaster prevention equipment, a receiving means for receiving a signal; and the receiving means operates when the signal is received, and determines whether the receiving means receives the signal after a predetermined time. and detecting means that determines that a signal has been detected when the receiving means receives a signal and the determining means determines reception after a predetermined time. Signal detection device for disaster prevention equipment.