JP6312055B2 - Fire receiver and automatic fire alarm system - Google Patents

Description

  The present invention relates to a fire receiver and an automatic fire notification facility for monitoring a voltage level of a display line connected to a sensor and notifying a fire.

  Conventionally, in a fire receiver as described above (so-called P-type receiver), as a self-diagnosis function, power is supplied to a display line that forms a closed loop by a terminating resistor, and the voltage level of the display line is compared with a disconnection threshold value. And the function to detect disconnection abnormality is built in. However, at present, the resistance value of the terminating resistor is uniquely determined for each model of the fire receiver. Therefore, when renewing the automatic fire alarm system, continue to use the display line, and when replacing the fire receiver, replace the terminating resistor of the existing display line with one that is compatible with the fire receiver after replacement. It was necessary and time-consuming.

  Examples of prior art relating to such a problem include the following Patent Documents 1 and 2. That is, Patent Document 1 teaches a configuration in which the operating point of the disconnection detection circuit can be adjusted by a variable resistor so as to be adapted to the termination resistor. In Patent Document 2, a detection resistor is connected to a display line, and a voltage generated in the detection resistor is compared with a reference voltage to detect a disconnection or a short circuit of the display line. The reference voltage can be changed by an adjustment resistor. Teach you to do.

Japanese Utility Model Publication No. 61-115289 JP 2005-044305 JP

  In the renewal as described above, if the technique taught in Patent Document 1 or 2 is adopted for a new fire receiver, the termination resistor is adjusted by adjusting the receiver side according to the termination resistor of the existing display line. You don't have to replace it. However, both Patent Documents 1 and 2 are configured to change the operating point or the reference voltage by adjusting a variable resistor or an adjusting resistor. Such adjustment may be difficult for an unfamiliar person, so that improvement is strongly desired. The present invention has been devised under such a demand, and at the renewal site, the adjustment for adapting to the resistance value of the terminating resistor connected to the existing display line is performed on the fire receiver side. The purpose is to make it easy to do.

The fire receiver according to the present invention is a fire receiver for monitoring a voltage level of a display line connected to a sensor and informing a fire, and an operation unit for inputting and setting a resistance value of a termination resistor connected to the display line; , A threshold selection unit that selects a disconnection threshold based on the set resistance value, and monitors the voltage level of the display line. If the voltage level of the display line exceeds the selected disconnection threshold, a disconnection abnormality is notified. In the control monitoring unit and the initial setting guide screen of the fire indicator, a display unit for guiding the input setting of the resistance value of the terminating resistor is provided.

  The control monitoring unit may digitally convert the voltage level of the display line, and numerically compare the value after digital conversion with the disconnection threshold value.

  The threshold selection unit may select a disconnection threshold for a set resistance value according to a data table or function prepared in advance.

  In the automatic fire alarm system according to the present invention, a display line connected to a sensor and a terminating resistor is connected to the fire receiver.

  In the present invention, an appropriate disconnection threshold value is automatically selected simply by inputting and setting the resistance value of the termination resistor at the operation unit, so even those who are unfamiliar with automatic fire alarm equipment can use existing display lines. The fire receiver can be easily adjusted and set according to the terminating resistor.

It is a schematic circuit diagram which shows the principal part structure of the fire receiver used as an example of embodiment of this invention. It is a schematic block diagram of the automatic fire alarm equipment by the said fire receiver. It is an example of the data table prepared beforehand by the threshold value selection part. It is a flowchart which shows an example of the basic operation | movement of the said fire receiver.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. The fire receiver according to the present invention is assumed to be a so-called P-type receiver that monitors the voltage level of a display line connected to a sensor and notifies a fire. Therefore, as in the prior art, power is supplied to a display line that forms a closed loop by a terminating resistor, and the voltage level of the display line is compared with a disconnection threshold value to detect a disconnection abnormality.

  In the renewal of the automatic fire alarm system using such a fire receiver, the present invention replaces the fire receiver with the terminating resistor of the display line when the existing display line is used as it is. It is intended to make it easy to adjust the fire receiver.

  FIG. 1 is a schematic circuit diagram showing only relevant parts of the present invention in a fire receiver as an example of an embodiment. The fire receiver 10 includes an operation unit 11 that inputs and sets a resistance value of a termination resistor TR connected to the display line L, and a threshold selection unit 12 that selects a disconnection threshold based on the set resistance value. . The control monitoring unit 13 is a component that controls the power supply to each of the display lines L, monitors the voltage level of the display lines L, and issues a warning by a main sound or a district display when a fire occurs. As a self-diagnosis, the control monitoring unit 13 monitors the voltage level of the display line L, and notifies the disconnection abnormality if the voltage level of the display line L exceeds the selected disconnection threshold.

  The fire receiver 10 includes a plurality of display line terminals LT and one common line terminal CT. A display line L is connected to the display line terminal LT, and a common line C (ground line) is connected to the common line terminal CT. A plurality of sensors S are connected in parallel between the display line L and the common line C, and a termination resistor TR is connected between the terminal portion of the display line L and the common line C.

  The fire receiver 10 includes a power supply circuit 14 that supplies power to the display line L, and a control element Q and a resistor R are provided in the middle of a power supply path from the power supply circuit 14 to the display line terminal LT. Control of power supply to the display line L by the control monitoring unit 13 is performed by turning on / off the control element Q.

  The reason why such power control is necessary is that, as a basic specification of the sensor, it is necessary to temporarily shut off the power to reset the alarm. That is, the sensor C operates by receiving power from the display line L, and when a fire is detected, the display line L and the common line C are conducted to make a report, and when the power is turned off, the report is reset. It has become.

  The configuration of the operation unit 11 is not particularly limited, but the resistance value of the termination resistor TR can be input and set by a simple operation. For example, a resistance value option may be prepared, and a resistance value matching the resistance value of the termination resistor TR of the existing display line L may be selected, or numerical value information of the resistance value may be input. May be. The resistance value input and set here may be stored in a nonvolatile memory (not shown) or the like.

  The threshold selection unit 12 selects a disconnection threshold for the set resistance value according to a data table or function prepared in advance. In other words, if one of the resistance value options is selected in the operation unit 11, the threshold value selection unit 12 may be prepared with a data table that defines a disconnection threshold value suitable for each selected resistance value. . If such a data table is prepared, an appropriate disconnection threshold value can be selected for the selected resistance value by a simple process. On the other hand, if numerical value information of the resistance value is input in the operation unit 11, a function for outputting an appropriate disconnection threshold for the input resistance value is prepared in the threshold selection unit 12. Good. Then, an appropriate disconnection threshold value can be calculated for any resistance value.

  FIG. 2 shows an example of a data table prepared in the threshold selection unit. This data table D assumes 2 kΩ, 3 kΩ, 4 kΩ, 5 kΩ, 7.5 kΩ, and 10 kΩ as options for the resistance value in the operation unit 11, and an appropriate disconnection threshold of 22.6 V for each resistance value. 23.0V, 23.2V, 23.4V, 23.5V, and 23.6V are associated. Note that the number of options, the numerical value of the resistance value, and the numerical value of the disconnection threshold are merely examples, and in particular, the numerical value of the disconnection threshold takes into account the output voltage of the power supply circuit 14, the resistance value of the resistor R, and the like. Should be decided.

  The display line L is connected to the control monitoring unit 13 via the resistor R and the A / D converter 15. In this case, the voltage level of the display line L is input to the A / D converter 15 as it is. If the output voltage of the power supply circuit 14 is too high for the A / D converter 15, the voltage level of the display line L is stepped down by appropriately dividing the voltage by two resistors, and then the A / D converter. 15 may be input.

  The control monitoring unit 13 digitally converts the voltage level of the display line L by the A / D converter 15 and compares the value after the digital conversion with a disconnection threshold value. That is, the control monitoring unit 13 periodically selects the voltage level of the display line L after A / D conversion based on the disconnection threshold selected by the threshold selection unit 12 based on the resistance value input and set by the operation unit 11. If the voltage level is equal to or higher than the disconnection threshold, it is determined that the disconnection is abnormal and the notification is made. With such a configuration, the comparison between the voltage level and the threshold value becomes numerical processing and can be executed by a microcomputer or the like, so that the circuit configuration is simplified.

  The control monitoring unit 13 determines the fire level in the same manner as described above, that is, periodically compares the voltage level of the display line L after A / D conversion with a predetermined fire threshold value, and the voltage level is fired. You may make it judge a fire if it is below a threshold value. Although it is not necessary to synchronize the operation for determining the disconnection abnormality and the operation for determining the fire, the overall control operation is simplified if they are synchronized.

  As described above, in the present invention, an appropriate disconnection threshold value is automatically selected only by inputting and setting the resistance value of the termination resistor in the operation unit 11, so even a person unfamiliar with automatic fire alarm equipment can The fire receiver 10 can be easily adjusted and initialized in accordance with the terminating resistor TR of the existing display line L.

  FIG. 3 is a front view of a fire receiver that is an example of an embodiment, and further, an automatic fire alarm facility configured by using the fire receiver by showing display lines and various interlocking devices in the figure. The schematic structure is also shown.

  The fire receiver 10 is provided with a status lamp 16a for notifying a power supply state, a warning state, and a trouble occurrence in the upper front part of the housing, and below that, a display window 16b composed of a liquid crystal panel, a fire lamp, An emergency lamp 16c such as an alarm lamp is provided. Further below this, there are provided main operation keys 11a such as a receiver sound stop key, a district bell stop key, a release key, and a recovery key. Further below that, there are provided sub-operation keys 11b for inputting and setting the resistance value of the terminating resistor TR connected to the display line L, setting the interlocking relationship, and conducting the test. . The sub operation key 11b is hidden by the protective panel 17 so as not to be erroneously operated. An inlet (not shown) for the display line L and the like is provided on the rear surface of the housing.

  In the initial setting, the display window 16b displays a guide screen or the like and guides the input setting of the resistance value of the terminal resistor TR. However, the display window 16b mainly performs district display in a warning state or an alarm state.

  A plurality of display lines L connected to the sensor S and the terminating resistor TR, a bell line BL connected to the district bell B, and a display lamp line UL connected to the indicator lamp U are transferred to the fire hydrant driving device 20. The report line HL and the transfer line FL to the guide lamp lighting device 30 are connected to the fire receiver 10. The transmitter P is connected not only to the display line L but also to the transmitter response line AL. Here, the display line L, the bell line BL, and the indicator lamp line UL are voltage signal lines, and the number of the sensor S, the district bell B, and the indicator lamp U that can be connected to the signal lines L, BL, UL. There are limitations. On the other hand, the transfer lines HL and FL are both no-voltage signal lines.

  Next, the basic operation of the automatic fire alarm facility will be described.

  In the initial setting of the fire receiver 10, the disaster prevention staff sets the use / non-use for each display line L, the interlocking relationship between the display line L and the interlocking device, etc. according to the guide screen displayed on the display window. The resistance value of the terminating resistor TR is set as follows.

  In the subsequent alert state, the fire receiver 10 supplies power to the display line L, and monitors the alarm and disconnection abnormality by comparing the voltage level with the fire threshold and the disconnection threshold. When one of the sensors S is actuated by a fire and the display line L is short-circuited, the fire receiver 10 detects this and starts the accumulation process. At this point, the corresponding location in the district display is changed during accumulation. The accumulation process is a process of accumulating the notifications by repeating the operation of shutting off the power of the display line L that has issued the alarm for a predetermined time and repeating the notification.

  Therefore, when a certain amount of notifications are accumulated, the fire receiver 10 judges a fire, turns on the fire lamp, and changes the corresponding part of the district display to fire. Furthermore, the fire receiver 10 starts the main sound such as “Peep, the sensor has been activated. Please check the site”, and drives the bell line BL etc. that are set in conjunction. In this way, district ringing is performed.

  When the transmitter P is operated, the fire receiver 10 immediately determines a fire without performing accumulation processing and issues a similar fire alarm. At this time, the alarm lamp is also turned on.

  Disaster prevention personnel operate the receiver acoustic stop key and the district bell stop key to confirm the site. In response to these operations, the fire receiver 10 stops the main voice and the district ringing. If the disaster prevention staff confirms the false alarm, they operate the recovery key. In response to this, the fire receiver 10 resets the fire lamp and the district display, and resets the sensor S by shutting off the power of the indicated display line L for a predetermined time.

  On the other hand, if the recovery key is not operated before a predetermined time elapses after the fire is determined, the fire receiver 10 resumes the main sound and district ringing that have been paused. If the interlocking relationship with the passage of time is set, the fire receiver 10 operates the fire hydrant driving device 20, the guide lamp lighting device 30 and the like at this time.

  The disaster prevention staff checks the fire, reports 119, guides evacuation, etc., and then operates the recovery key after confirming that the fire is extinguished. In response to this, the fire receiver 10 stops the main voice and the district voice, returns the fire lamp and district display to the original state, shuts off the power of the indicated display line L for a predetermined time, and resets the sensor S. .

  When the fire receiver 10 detects a disconnection abnormality of the display line L in a warning state, the fire lamp 10 turns on the status lamp 16a for notifying the occurrence of the trouble, and changes the corresponding part of the district display to a disconnection abnormality. In addition, a main sound such as “PPP, display line disconnection error detected. Check the site” is output. If the disaster prevention staff repairs the disconnection of the display line L, the fire receiver 10 automatically detects the disconnection abnormality and detects it.

  FIG. 4 is a flowchart summarizing the essential points of the basic operation.

  Steps 100 and 101 are processes related to the initial setting of the fire receiver. In step 10, the input setting of the resistance value of the terminating resistor connected to the display line is accepted. In step 101, the set resistance value is set. Based on this, the disconnection threshold is selected.

  Steps 102 to 106 are processing in a warning state and an alarm state. In step 102, the voltage level of the display line is detected. In step 102, the detected voltage level is compared with a disconnection threshold value, and in step 103, disconnection abnormality is notified based on the comparison result. In step 104, the detected voltage level is compared with a fire threshold, and in step 106, a fire alarm is given based on the comparison result. Steps 102-106 are repeatedly executed as long as the alarm state and the alarm state are met.

DESCRIPTION OF SYMBOLS 1 Automatic fire alarm equipment 10 Fire receiver 11 Operation part 12 Threshold selection part 13 Control monitoring part D Data table L Display line TR Terminating resistor

Claims (4)

In the fire receiver that monitors the voltage level of the display line connected to the sensor and notifies the fire,
An operation unit for inputting and setting the resistance value of the terminating resistor connected to the display line,
A threshold selection unit for selecting a disconnection threshold based on the set resistance value;
A control monitoring unit that monitors the voltage level of the display line, and notifies a disconnection abnormality if the voltage level of the display line exceeds a selected disconnection threshold ;
A fire receiver comprising a display unit for guiding an input setting of a resistance value of the terminal resistor on a guide screen for initial setting of the fire indicator . In claim 1,
The control monitoring unit digitally converts a voltage level of a display line, and compares the value after digital conversion with the disconnection threshold value numerically. In claim 2,
The threshold value selection unit selects a disconnection threshold value for a set resistance value according to a data table or function prepared in advance. An automatic fire alarm system characterized in that a display line connected to a sensor and a terminating resistor is connected to the fire receiver according to any one of claims 1-3.

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