JP4258129B2 - Gas shut-off device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas shut-off device for ensuring safety in use of gas when using gas downstream (gas appliance side) from a gas meter. In particular, it relates to a communication function.
[0002]
[Prior art]
Conventionally, in this type of gas shut-off device, as shown in FIG. 6, the center communication unit 21 demodulates a signal that has been modulated using an NCU device using a communication line (eg, no-ringing communication on a telephone line). Receiving communication from a monitoring center that monitors the gas shutoff device via a public line such as a communication performed using the Internet, an Internet communication, or a dedicated line) When the transmission message b is received, the communication analysis unit 22 communicates with the monitoring center. Upon receiving the reception message a of the center communication unit 21, the communication analysis unit 22 receives information data c (for example, a data portion included in the reception message). Or a response request signal d may be output, and the information holding unit 23 may output the information of the communication analyzing unit 22. The data c or the information data c of the information collection unit 29 is held, and the communication message creation unit 24 receives the response request signal d of the communication analysis unit 22 and acquires the information data c of the information holding unit 23 When the transmission message b is output, the signal input unit 25 outputs a reception signal e when receiving a signal from an external device (for example, a non-contact signal using magnetic force, light, etc.), and the forced cutoff determination unit 34 It is determined whether the received signal e of the signal input unit 25 is a predetermined signal (continuous signal of a certain time or more). If the received signal e matches the predetermined signal, the event occurrence signal j and the cutoff request signal g And an external output signal k (for example, a blinking signal at regular intervals for causing the LED to emit light, or a lighting signal for displaying the LCD can provide the same effect.
[0003]
(Alternatively, the same effect can be obtained by sound output by a piezoelectric buzzer or the like, or magnetic output by an electromagnetic coil or the like), and the external output unit 27 outputs the external output signal k of the forced cutoff determination unit 34 or the flow rate determination unit 31. Upon receipt, notification is made to the outside (for example, by LED or LCD display means, or by sound or magnetic force), or when an external communication signal m of the external communication unit 35 is received, communication to an external device (for example, display of LED or LCD) The flow rate input unit 30 outputs the flow rate signal i (for example, every time a certain amount of gas passes) or distributes the gas flow rate by means of means or by sound or magnetic force. By calculating the pressure increase / decrease as the vibration of the gas pressure sensor, the instantaneous flow velocity is calculated from the vibration period and a flow rate signal is output, or the thermocouple installed in the gas passage Temperature is taken as a resistance value and the flow velocity is calculated and a flow rate signal is output, or sound wave sensors are installed upstream and downstream in the gas passage, and upstream to downstream and downstream to upstream If the sound wave is emitted toward the side and the propagation time shift of the sound when the gas is flowing is obtained and the flow velocity is calculated and the flow rate signal is output, the same effect can be obtained) 31 obtains the flow rate signal i of the flow rate input unit 30 and compares it with a value held in advance. If the flow rate signal i is greater than or equal to a value held in advance, it is determined as abnormal and the event occurrence signal j, the interruption request signal g, and the external output signal k are output, and the information collecting unit 29 receives the event occurrence signal j of the forced interruption determination unit 34 or the flow rate determination unit 31 (or detects an earthquake). Sensor The information from the sensor for detecting the gas pressure and the information such as the voltage drop of the battery driving the gas shut-off device may be used as the information data.) The information data c is output, and the valve drive unit 32 outputs the forced shut-off determination unit 34. Alternatively, when the shut-off request signal g from the flow rate determination unit 31 is received, the valve drive signal h is output, and when the valve 33 receives the valve drive signal h from the valve drive unit 32, the gas passage is closed, and when the valve is opened, the valve 33 is restored. When the signal l is output and the external communication unit 35 receives the return signal l of the valve 33, the external communication unit 35 acquires the information data c of the information holding unit 23 and synchronizes with the reception signal e of the signal input unit 25. While the handshake, the external communication signal m (a signal to which the data sent by the handshake is returned and a result indicating whether or not it matches the information data c) is output. It was like that.
[0004]
[Problems to be solved by the invention]
However, in the conventional gas shut-off device, in order to synchronize with an externally connected setter or the like for external communication, it is necessary to temporarily close the gas passage by forced shut-off and then open the plug. As the contents, only the result of whether or not the data transmitted by the handshake and the information data held by the gas shut-off device matched can be obtained. That is, the amount of information (the information data itself of the gas shut-off device itself can be acquired as data by the center communication) is much smaller in the center communication performed by the center monitoring the gas shut-off device.
[0005]
From this, the user using the gas needs an inspection period of several minutes until the external communication is completed (further, since the gas passage is once closed, it is inspected for gas leakage after opening, After successfully passing this inspection period, the user must be allowed to use gas). In addition, since the result obtained by external communication is only pass / fail, when there are a plurality of states for one event, for example, the gas passage is opened after a certain period of time has passed since starting to use the gas for a stable gas flow rate. Although the gas shut-off device has a function of closing, in order to confirm at which time this fixed time (for example, four ways of 60 minutes, 120 minutes, 240 minutes, and 480 minutes) was selected, 1 It has to be confirmed one by one, and if there are n options, there is a problem that communication must be performed a maximum of n-1 times.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention 1 eliminates what is forced to shut off only in order to synchronize a gas shut-off device with a setting device connected to the outside and the like. In addition to improving convenience, the setting device connected externally can also ignite the burner immediately when the amount of information (for example, gas leakage due to a crack in a fine gas passage and small gas water heater, etc. is discharged, as in center communication) The gas shut-off device has a function of registering the flow rate of the fire to distinguish the fire that is constantly being burned, but in conventional external communication, it was confirmed only by pass / fail for the presence or absence of registration. It is possible to check the registered amount of ignited flow rate itself as the same amount of information as in the center communication) until it is possible to acquire a lot of information and pass or fail It is possible to omit the communication which has been haphazard implementation, it is possible to shorten the engage time communication.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a center communication that outputs a reception message when receiving a communication from a monitoring center that monitors the gas shutoff device via a communication line and communicates with the monitoring center when receiving a transmission message. A communication analysis unit that outputs information data and a response request signal when receiving the received message of the center communication unit, an information holding unit that holds the information data when receiving the information data of the communication analysis unit, A communication message creation unit that creates the transmission message using the information data of the information holding unit when receiving the response request signal of the communication analysis unit or a communication request signal, and an external device other than the monitoring center A signal input unit that outputs a received signal when receiving a signal from the signal, and the received signal of the signal input unit Is detected at a fixed interval, and when an ON signal is detected twice from the received signal, a shutoff request signal is output to the valve drive unit, and the ON signal cannot be detected twice from the received signal. Receive signal Is a predetermined signal, and if it matches the predetermined signal, the signal determination unit that outputs the communication request signal and the transmission message of the communication message generation unit receive the transmission message other than the center An external output unit for outputting the content of the transmission message to an external device; The received signal is a signal in which an ON signal having a width narrower than the detection timing interval and an OFF signal having a width longer than the detection timing interval are repeated. Is.
[0008]
According to a second aspect of the present invention, when a plurality of predetermined reception signals are received from an external device, a plurality of signal determination units that output a plurality of communication request signals and a plurality of the communication request signals are received. A communication message creating unit that creates a plurality or one transmission message corresponding to the communication request signal and an information collecting unit that collects the state of the gas cutoff device and outputs information data are added.
[0009]
The invention according to claim 3 is changed to an external output unit that outputs the content of the received message to an external device other than the monitoring center when the received message of the center communication unit is received.
[0010]
Alternatively, the invention according to claim 4 communicates using the center communication unit, communicates using the external output unit, or communicates using both the center communication unit and the external output unit. A communication message creating unit that creates a transmission message to which communication permission information that can be selected is added, the center communication unit that identifies the communication permission information, and performs communication, and the external output unit.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
Example 1
FIG. 1 is a functional block diagram of a gas cutoff device according to Embodiment 1 of the present invention. FIG. 2 is a program flow diagram of the first embodiment.
[0013]
In FIG. 1, the center communication unit 1 is a communication line (for example, a communication line using a public line such as communication performed by demodulating a signal modulated using an NCU device using no-ringing communication of a telephone line, When communication from a monitoring center that monitors the gas shutoff device is received via Internet communication or a dedicated line), a received message A is output, and center communication (the gas shutoff device is used for center communication). When the monitoring message and the gas shutoff device operate asynchronously (having a protocol that can be synchronized), the transmission message B that is permitted is received, and the center communicates with the monitoring center.
[0014]
When the communication analysis unit 2 receives the received message A of the center communication unit 1, the communication analysis unit 2 extracts information data C (for example, extracts a data unit included in the received message, or collects information of the gas shut-off device at the time of communication) The response request signal D is output.
[0015]
The information holding unit 3 holds the information data C of the communication analysis unit 2 or the information data C of the information collection unit 9, and the communication message creation unit 4 receives the response request signal D of the communication analysis unit 2, or the signal determination unit 6 Alternatively, when the communication request signal F of the multiple signal determination unit 8 is received, the communication permission information for acquiring the information data C of the information holding unit 3 and performing center communication, communication from an external output, or both center communication and communication from an external output (Selection of communication permission (instruction for each combination such as center communication is center communication only) may be held in the gas shut-off device in advance, or the received message A from the center communication unit 1 and the signal determination unit 6 or a plurality of them. A transmission telegram B to which the same effect is obtained even if added to the communication request signal F from the signal determination unit 8 is output.
[0016]
As shown in FIG. 7, the signal input unit 5 is a signal from a setting device 71 mounted outside (for example, a non-contact signal using magnetic force, light, etc., or input means other than the input unit for detecting forced cutoff). If the signal is received, the reception signal E is output, and the signal determination unit 6 determines the on / off pattern of the reception signal E of the signal input unit 5.
[0017]
For example, when the received signal E is a continuous signal for a certain time or longer as shown in FIG. 3, it is determined that the conventional function is forcibly cut off. As a method for determining this continuous signal, a method for determining by measuring the detection time as shown in (1), and a method for detecting a signal at regular intervals as shown in (2) and continuously if it is in the same state. It is possible to consider this as a signal. By the way, the setting unit attached to the outside that generates a continuous signal and the gas shut-off device operate in an unlinked manner, so in the fixed interval method, the setting attached to the outside is used to make sure that it is turned on at a certain detection timing. In consideration of an error between the gas shutoff device and the gas shutoff device (for example, detection timing shifts due to interrupt processing of other functions possessed by the gas shutoff device), an ON signal slightly wider than a certain interval as shown in (3) For example, in the case of detecting a continuous signal twice and forcibly shutting it off, the upper detection timing is detected once, whereas the lower detection timing is detected. It will be detected twice and it will be forcibly cut off. Therefore, in FIG. 4, by transmitting the ON signal α that is slightly narrower than a certain interval, for example, twice across the OFF signal β that is half the width of α, a wide ON signal that can be detected twice. Instead of issuing a signal, it is possible to detect one on-time reliably by one continuous communication (If an on-signal with a little narrow width is output only once, the on-signal cannot be detected if it is sandwiched between detection timings. If it cannot be detected, communication from the setting device attached to the outside must be performed again.
[0018]
If the received signal E is a continuous signal (for example, detection of continuous on twice), an event occurrence signal J, a shut-off request signal G, and an external output signal K (for example, a blinking signal at regular intervals for causing an LED to emit light may be displayed. The same effect can be obtained with a lighting signal, or the same effect can be obtained with a sound output by a piezoelectric buzzer or a magnetic output by an electromagnetic coil or the like.
[0019]
The received signal E can be distinguished from noise by determining that the ON signal and the OFF signal are repeated, as shown in FIG. 5 (4), for example, as shown in FIG. In order to reliably communicate with one operation of the setting device, when the signal of (4) is detected in the format shown in FIG. 4 (the same content may be transmitted with a β-time shift) is detected. Is communication permission information (communication permission selection (instruction for each combination such as center communication is center communication only)) for performing communication from center communication, communication from external output or both communication from center communication and external output in advance. Or the same effect can be obtained by adding it to the received message A from the center communication unit 1 or the communication request signal F from the signal determination unit 6 or the multiple signal determination unit 8). Added communication request signal F Forces.
[0020]
The multiple signal determination unit 8 receives the received signal E from the signal input unit 5 and sets a plurality of predetermined signals (for example, to handle a plurality of messages, the message length is shown as (5) to (7) in FIG. This can be done by combining the extension and on / off patterns, but the signal from the setting device attached to the outside is serial communication, so it is necessary to further increase the communication length in order to handle more messages. For example, as in (7), it may be determined that the data length is fixed starting from the first ON (if the data length is indefinite, it cannot be determined whether it is an off signal or the message ends shortly) Or after receiving the signal of (4), even if data that is continuously turned on twice or more for a certain time (for example, 1 minute) is sent, it is not regarded as a forced shut-off, so that it is not regarded as a forced cutoff. Short signal Communication permission information (multiple center communication, communication from external output, or communication from both center communication and external output) (communication permission selection (center communication only includes center communication, etc.) May be held in the gas shut-off device in advance, or added to the received message A from the center communication unit 1 or the communication request signal F from the signal determination unit 6 or the multiple signal determination unit 8. The communication request signal F to which the same effect is obtained is output.
[0021]
When the external output unit 7 receives the external output signal K from the signal determination unit 6 or the flow rate determination unit 11, the external output unit 7 notifies the outside (for example, by an LED or LCD display means, or by sound or magnetic force), or the center communication unit 1 When the received message A or the transmitted message B that is permitted to communicate from the external output of the communication message creation unit 4 is received, the same content as the center communication is transmitted to the external device with the same content (for example, gas leakage due to a crack in a fine gas passage) The gas shut-off device has a function of registering the flow rate of the fire in order to distinguish the fire that is always being burned so that the burner can be ignited immediately when the hot water is discharged in a small gas water heater or the like. Communication was confirmed only by pass / fail for the presence or absence of registration, but it is possible to confirm the registered igniting flow rate value itself with the same amount of information as the center communication (example) If, by LED or LCD display means, or by sound or force) to.
[0022]
The flow rate input unit 10 outputs a flow rate signal I (for example, every time a certain amount of gas passes), or distributes the gas flow rate to increase or decrease the pressure of the gas pressure sensor. By calculating the instantaneous flow velocity from the vibration period and outputting the flow signal, or obtaining the temperature deprived by the flow of the thermocouple gas installed in the gas passage as the resistance value and calculating the flow velocity Propagation time of sound when a flow signal is output or a sound wave is emitted from the upstream side to the downstream side and from the downstream side to the upstream side by installing sound wave sensors in the gas passage Even if the deviation is acquired and the flow velocity is calculated and the flow rate signal is output, the same effect can be obtained).
[0023]
When the flow rate determination unit 11 acquires the flow rate signal I of the flow rate input unit 10, the flow rate determination unit 11 compares the flow rate signal I with a value held in advance. A shutoff request signal G and an external output signal K are output.
[0024]
When the information collection unit 9 receives the event occurrence signal J from the signal determination unit 6 or the flow rate determination unit 11 (or information from the sensor that detects an earthquake or the sensor that detects gas pressure, or the battery voltage that drives the gas cutoff device Information such as a drop may be used as information data). Information data C is output.
[0025]
The valve drive unit 12 outputs a valve drive signal H when it receives the shut-off request signal G from the signal determination unit 6 or the flow rate determination unit 11, and the valve 13 closes the gas passage when it receives the valve drive signal H from the valve drive unit 12. .
[0026]
Next, the operation and action will be described. FIG. 2 shows a program flow of the above means from process S1 to process S20. Now, it is assumed that the flow from the start to the end of processing is periodically processed by an interval calendar or the like.
[0027]
In the signal input unit 5 of the gas shut-off device, the process S1 determines the presence / absence of a signal (for example, a non-contact signal using magnetic force / light), and if there is a signal, the process proceeds to the process S2, and if there is no signal, the process S3. Migrate to
[0028]
In the signal determination unit 6, as shown in (3) of FIG. 3, the process S2 shifts to the process S5 when ON is detected at the detection timing consecutive twice, and shifts to the process S3 if not detected twice. In process S3, the on / off pattern of the signal is determined, and if the pattern is a predetermined pattern, the process proceeds to process S12. If not, the process proceeds to process S4.
[0029]
In the multiple signal determination unit 8, it is determined whether the process S4 is a plurality of patterns. If it is a plurality of patterns, the process proceeds to a process S13, and if not any of the plurality of patterns, the process proceeds to a process S8.
[0030]
In the information collecting unit 9, the information holding unit 3 holds information that the process S5 is forcibly blocked, and the process proceeds to the process S6. In the valve drive unit 12, the process S6 outputs a signal for closing the gas passage, and the process proceeds to the process S7. In the valve 13, the process S7 closes the gas passage and proceeds to the process S8.
[0031]
In the center communication unit 1, the process S8 determines whether or not there is communication from the center monitoring the gas shut-off device. If there is communication from the center, the process proceeds to process S9, and if there is no communication, the process proceeds to process S18.
[0032]
In the communication analysis unit 2, the process S9 takes out the information of the message sent from the center and proceeds to the process S10. In the information holding unit 3, the process S10 holds the information extracted in the process S9 and proceeds to the process S11.
[0033]
In the communication analysis unit 2, the process S11 selects a response message, and proceeds to the process S12 and the process S13 (in the case where more multiple messages are processed, a configuration in which more than one branch is made).
[0034]
In the communication message creation unit 4, the process S12 creates the nth transmission message using the information data of the information holding unit 3 and proceeds to the process S14. The process S13 creates the n + 1th transmission message of the information data of the information holding unit 3. The process proceeds to step S14.
[0035]
In the center communication unit 1, the process S14 determines whether the center communication is permitted. If the center communication is permitted, the process proceeds to the process S15. If the center communication is not permitted, the process proceeds to the process S16. In step S15, the transmission message is communicated to the center, and the process proceeds to step S16. In the external output unit 7, the process S16 determines whether or not the communication from the external output is permitted. If the communication from the external output is permitted, the process proceeds to the process S17, and if the communication from the external output is not permitted, the process proceeds to the process S18. Transition. In step S17, communication with the same message structure as the center communication is performed on an external device, and the process proceeds to step S18.
[0036]
In the flow rate input unit 10, the process S18 determines whether or not there is a flow signal. If there is a flow signal, the process proceeds to a process S19, and if there is no flow signal, the process ends.
[0037]
In step S19, the flow rate determination unit 11 compares the flow rate signal with a value held in advance. If the flow rate signal is equal to or greater than the value held in advance, the flow rate determination unit 11 determines that there is an abnormality and proceeds to step S20. If there is, the process is terminated.
[0038]
In the information collecting unit 9, the process S20 causes the information processing unit 3 to retain information that the process is interrupted by an abnormal flow signal of a certain value or more, and the process proceeds to the process S6.
[0039]
In the gas shut-off device that does not hold the center communication unit 1 and the communication analysis unit 2 described in the first embodiment, the same amount of information as the center communication (for example, fine gas) can be obtained via the signal input unit 5 and the external output unit 7. The gas shut-off device has a function of registering the flow rate of the fire in order to distinguish the gas leak caused by cracks in the passage and the fire always burned so that the burner can be ignited immediately at the time of hot water in a small gas water heater etc. However, in the conventional external communication, the confirmation was made only by the pass / fail of the presence or absence of registration, but it is possible to confirm the registered amount of igniting flow rate itself if the amount of information is the same as the center communication).
[0040]
Alternatively, even if the gas shut-off device that does not hold the center communication unit 1 and the communication analysis unit 2 described in the first embodiment is installed at the user who uses the gas, the center and the communication line that monitors the gas shut-off device are used. In this embodiment, the TNCU installed separately for communication is provided with a function of notifying the center of a predetermined signal similar to the setting device installed outside and the transmission message B acquired from the external output unit 7. The same information as the gas shutoff device 1 (for example, the amount of gas used for one month that is implemented once a month from the total integrated value obtained by sequentially integrating the flow rate signal with the function of the gas shutoff device. Etc.), even if a gas shut-off device that does not have a center communication function is installed at the beginning, when a center that monitors the gas shut-off device is opened, the transmission message from the external output unit is handled. You can also start the service by the communication without replacing the gas cutoff apparatus to the center communication function Tsukinomono be established that TNCU.
[0041]
In the present embodiment, the setting device has been described as an external device other than the monitoring center. However, the present invention is not limited to this, and any device that communicates with the gas cutoff device may be used.
[0042]
As described above, according to the present invention, by using an ON signal that is slightly narrower than the detection timing, it is possible to perform external communication without the need for forced cutoff as in the past, and a new input unit (others) Similarly, it is not necessary to add a new function to the input part of the function without operating the original function, and it is convenient for the user who uses gas. In addition, the consumption of the battery driving the gas shut-off device can be suppressed by eliminating the valve drive (30 times the communication speed in the center communication compared to the conventional communication speed with forced shut-off) Therefore, even if the same information as the center communication is output to the external output unit, the consumption of the battery consumed by the external output unit is equal to or less than the conventional one).
[0043]
In addition, by making it possible to select center communication and communication from an external output, it becomes possible to meet the purpose of communication, and consumption of the battery driving the gas shutoff device can be suppressed.
[0044]
Furthermore, since the contents equivalent to the center communication can be acquired by the external output unit, the administrator who manages the gas can install the gas shut-off device at the site where the gas shut-off device is not being monitored. More detailed information of the gas shut-off device can be grasped easily in time.
[0045]
Or at the site where the gas administrator installed the gas shut-off device, there was no means to confirm whether the center that monitors the gas shut-off device and the gas shut-off device is performing center communication, but the communication status is external Since it is displayed on the output section, the center communication will not be interrupted by the removal work of the gas shut-off device, or when the opening communication to the center monitoring the gas shut-off device is performed after the installation work, Because the communication status could not be confirmed, it was necessary to check whether it was possible to communicate correctly by telephone separately (whether it was correctly installed), but the gas administrator monitored the external output unit at the site, so the center communication was correct. You can confirm that it is done.
[0046]
Or at the site where the gas administrator installs the gas shut-off device, the contents operated by the gas administrator will be reported to the center monitoring the gas shut-off device, so remote monitoring becomes possible , It is possible to check whether the gas manager is carrying out accurate work at the center, and it is possible to remotely conduct on-the-job training (OJT) for new gas managers .
[0047]
As a result, it is possible to design a battery with a small capacity by omitting the forced shut-off and center communication function, and by using a small battery, the gas shut-off device can be downsized, or a battery with the same capacity Even if it is used, the product life can be extended.
[0048]
【The invention's effect】
As described above, according to the present invention, it is possible to improve the convenience of the user who uses the gas by eliminating what was forcibly cut off only in order to synchronize the setting device and the gas cutoff device. As with the center communication, the externally connected setting device etc. always has a larger amount of information (for example, gas leaks due to fine gas passage cracks and small gas water heaters etc. in order to be able to ignite the burner immediately when the hot water is discharged. The gas shut-off device has a function of registering the flow rate of the fire to distinguish the fire that is being burned, but in the conventional external communication, it was confirmed only by the pass / fail of the registration, but the same information as the center communication It is possible to check the amount of the ignited flow rate registered itself as a quantity), and it is possible to acquire a lot of information and conduct it on an ad hoc basis until pass / fail is passed And it is possible to omit the communication, it is possible to shorten the engage time communication.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a gas cutoff device according to Embodiment 1 of the present invention.
FIG. 2 is a program flow diagram of the gas shutoff device according to the first embodiment of the present invention.
FIG. 3 is a signal diagram from a setting device attached outside the present invention.
FIG. 4 is a signal diagram from a setting device attached outside the present invention.
FIG. 5 is a signal diagram from a setting device attached outside the present invention;
FIG. 6 is a functional block diagram of a conventional gas shut-off device.
FIG. 7 is a schematic diagram of a gas shut-off device and a setting device attached to the outside.
[Explanation of symbols]
1 Center Communication Department
2 Communication analysis department
3 Information holding part
4 Communication message creation department
5 Signal input section
6 Signal judgment part
7 External output section
8 Multiple signal determination unit
9 Information collection department
10 Flow rate input section
11 Quantity determination unit
12 Valve drive
13 Valve
71 Setting device

Claims (4)

A center communication unit that outputs a reception message when receiving a communication from a monitoring center that monitors the gas shutoff device via a communication line, and that communicates with the monitoring center when receiving a transmission message;
A communication analysis unit that outputs information data and a response request signal when receiving the received message of the center communication unit;
An information holding unit for holding the information data upon receiving the information data of the communication analysis unit;
When receiving the response request signal of the communication analysis unit or receiving a communication request signal, a communication message creating unit that creates the transmission message using the information data of the information holding unit;
A signal input unit that outputs a reception signal when receiving a signal from an external device other than the monitoring center;
The reception signal of the signal input unit is detected at a predetermined interval, and when an ON signal is detected twice consecutively from the reception signal, a cutoff request signal is output to the valve drive unit, and twice from the reception signal. A signal determination unit that determines whether the received signal is a predetermined signal when the ON signal cannot be detected continuously, and outputs the communication request signal if it matches;
An external output unit that outputs the content of the transmission message to an external device other than the monitoring center when receiving the transmission message of the communication message creation unit ;
The gas cutoff device , wherein the reception signal is a signal in which an ON signal having a width smaller than the detection timing interval and an OFF signal having a width longer than the detection timing interval are repeated .   A plurality of signal determination units that output a plurality of communication request signals when receiving a plurality of predetermined reception signals from an external device, and a plurality or one transmission corresponding to the communication request signals when receiving a plurality of the communication request signals The gas shut-off device according to claim 1, further comprising: a communication telegram creating unit that creates a telegram; and an information collecting unit that collects a state of the gas shut-off device and outputs information data.   The gas shut-off device according to claim 1, further comprising an external output unit that outputs the content of the received message to an external device other than the monitoring center when the received message is received from the center communication unit.   Transmission with communication permission information added to select whether communication is performed using the center communication unit, communication using the external output unit, or communication using both the center communication unit and the external output unit. The gas shut-off device according to claim 1, further comprising: a communication message creation unit that creates a message; the center communication unit that identifies and communicates with the communication permission information; and the external output unit.

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