JPH029436Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an alarm device that can notify the occurrence of an abnormality at a location where a terminal device is installed by means of a central device located at a location separate from the location where the terminal device is installed.

Some conventional alarm devices have a terminal device configured to transmit a signal in normal conditions and stop the signal in abnormal conditions, and a central device detects the presence or absence of the signal to determine whether there is an abnormality. Ta. but,
When increasing the number of installed terminal devices, such alarm devices are configured to send signals of different frequencies to each terminal device in order to distinguish which terminal device is detecting an abnormality. Accordingly, the central device must be configured to be able to receive signals of different frequencies, which makes the overall configuration of the alarm device complicated and troublesome to manufacture.

The object of this invention is to provide an alarm device whose overall structure is simple and easy to manufacture.

Therefore, the alarm device according to this invention consists of one central device, a plurality of intermediate devices that are called by a call signal sequentially generated by the central device, and n terminal devices attached to each intermediate device. Become,
The multiple terminal devices are configured to generate a normal signal when there is no abnormality in what they are monitoring, and stop generating the normal signal when there is an abnormality. The frequency of the signal is
They are different from ₁ to _o . Then, if there is no abnormality, the intermediate device called by the central device receives one of the m signals determined for each intermediate device.
The central device is configured to send one response signal and the above-mentioned ₁ to _o signals to the central unit. If the called intermediate device has an abnormality, the intermediate device does not send a response signal to the central device, and the central device indicates which intermediate device has the abnormality based on not receiving the response signal. Furthermore, if any of the terminal devices attached to the called intermediate device detects an abnormality, that terminal device will stop generating the normal signal, so the central device will determine which intermediate device to send based on the fact that it has not received the normal signal. Indicates whether the attached terminal device has detected an abnormality.

Hereinafter, this invention will be explained in detail based on one embodiment shown in the drawings. As shown in FIG. 1, this alarm system consists of one central device 1 and ten intermediate devices 2-
1 to 2-10 and each intermediate device 2-1 to 2-1
It has n terminal devices 3-1 to 3-n, each attached to a terminal device 3-n.

The central device 1 is connected to the intermediate device 2 as shown in FIG.
_-F1 transmitter 4 for calling 1 to 2-10
-1 to _F10 transmitters 4-10. F ₁ transmitter 4-1 transmits a signal of frequency F ₁ , F ₂ transmitter 4-
2 transmits a signal of frequency F ₂ ...F ₉ transmitter 4-9 transmits a signal of frequency F ₉ , F ₁₀ transmitter 4-10 transmits a signal of frequency F ₁₀
The signals are generated respectively. The F ₁ transmitter 4-1 operates while the output 1 of the counter 5 is at the H level, the F ₂ transmitter 4-2 operates while the output 2 of the counter 5 is at the H level,...the F ₉ transmitter 4-9 While the output 9 of the counter 5 is at the H level, the _F10 transmitters 4-10 each generate a signal while the output 10 of the counter 5 is at the H level. Counter 5 is one shot 6
Alternatively, the output state is changed every time the output pulse of the retrigger one shot 7 rises. For example, output 1
If the above pulse rises when only output 10 is at H level, only output 2 becomes H level, and if only output 10 rises and only output 10 is at H level, only output 1 becomes H level.

The intermediate device 2-1 has an F ₁ receiver 8-1 that receives the F ₁ signal, and the intermediate device 2-2 receives the F ₂ signal.
The _intermediate device 2-9 connects the F ₉ receiver 8-9, which receives the F ₉ signal, to the intermediate device 2-9.
10 has an F ₁₀ receiver 8-10 for receiving the F ₁₀ signal. Also, intermediate devices 2-1, 2-3,...2
-9 has an F _a transmitter 9 that generates a response signal of frequency F _a , and intermediate devices 2-2, 2-4, ... 2-1
0 is F _b transmitter 1 which generates a response signal of frequency F _b
It has 0.

The central device 1 has an F _a receiver 11 that receives the response signal F _a and an F _b receiver 12 that receives the response signal F _b .

Therefore, when the output 1 of the counter 5 reaches H level in a state where there is no abnormality in each intermediate device 2-1 to 2-10 and each terminal device 3-1 to 3-n attached thereto, the _F1 transmitter 4-1 sends the _F1 signal to each intermediate device 2-1 to 2- via the coaxial cable 13.
Send on 10. At this time, output 1 of counter 5
When the signal becomes H level, the retrigger one shot 7 is set and the output becomes low level. This retrigger one shot 7 has been set since 3
It is configured to reach H level in seconds.

The F ₁ signal is received by the F ₁ receiver 8-1 of the intermediate device 2-1. The F ₁ receiver 8-1 activates the F _a transmitter 9 and also activates the relay 14, and connects the contact 15.
Close. This causes the central device 1 to receive the F _a signal,
Normal signals ₁ to _o are sent.

The F _a receiver of the central device 1 receives the F _a signal and supplies an H level signal to the AND circuit 16-1. Since this AND circuit 16-1 is also supplied with the output 1 of the counter 5 at H level, this AND circuit 16-1 sets the one shot 6. Since the one shot 6 is configured to maintain the L level for 2 seconds after being set, only the output 2 of the counter 5 becomes the H level after 2 seconds. As the output 1 of the counter 5 becomes L level, the F ₁ transmitter 4-1 stops and the intermediate device 2-1
The transmission of the F _a signal and _{the 1} to _o signals is stopped. Further, since the output 2 of the counter 5 becomes H level, the retrigger one shot 7, which is still at the L level, is set again and remains at the L level for another 3 seconds. At the same time, the _F2 transmitter sends out the _F2 signal, and in response, the intermediate device 2-2 sends out the _Fb signal and _{the 1} to _o signals to the central device 1. The F _b receiver receives the F _b signal and outputs the H level signal to the AND circuit 16 -
Supply to 2. Since output 2 at H level is supplied from counter 5 to AND circuit 16-2, one shot 6 is set by AND circuit 16-2. Hereafter, such operations are repeated. A time chart without this abnormality is shown in FIG.

Next, a case where there is an abnormality in the _Fb transmitter 10 of the intermediate device 2-2 will be described. of intermediate device 2-2
If there is an abnormality in the _Fb transmitter 10, the _F2 receiver 8-2
Even if the F _b transmitter 10 receives the F ₂ signal, the F b transmitter 10 does not generate the F _b signal and no signal is sent to the central unit 1 . Therefore, the F _b receiver 12 of the central unit 1
The inverter 17 inverts the L level signal to H level and supplies it to the AND circuit 18-2. Since the AND circuit 18-2 is supplied with the output 2 at H level from the counter 5, the AND circuit 18-2 is connected to the abnormality indicating terminal 21-2 via the delay circuit 19-2 and the amplifier 20-2. Supplies an H level signal to. Note that since the output of the _Fb receiver 12 is at the L level, the one shot 6 does not operate, but when the output 1 of the counter 5 is switched from the H level state to the H level state, the output 2 is set at the H level state. It rises 3 seconds after the trigger one shot is set, and this causes the output 3 of the counter 5 to go high.
It can be switched to the level state. of intermediate device 2-2
FIG. 4 shows a time chart when there is an abnormality in the _Fb transmitter 10. F _b transmitter 1 of other intermediate equipment
0, F _a Even if there is an abnormality in the transmitter 9, the inverter 22 and AND circuits 18-1, 18-3 to 18-
10. Delay circuits 19-1, 19-3 to 19-1
0, the amplifiers 20-1, 20-3 to 20-10 operate in the same manner. In this embodiment, the frequency of the response signal from the intermediate devices 2-1 to 2-10 to the central device 1 is set to F _a for the odd number groups 2-1 to 2-9, and F a for the even number groups 2-2 to 2-10. In this case, the frequencies are different, such as F _b , but instead of doing this, each intermediate device 2-1 to 2-
If the frequencies of the 10 response signals are all the same frequency, for example F _b , the following inconvenience will occur. That is,
As mentioned above, for example, when there is an abnormality in the F _b transmitter 10 of the intermediate device 2-2 in the even group and it is not generating the F _b signal, an intermediate device in the odd group, for example 2-1, may transmit something. Due to the cause of F _b
When a signal is generated, the central device 1 sends the intermediate device 2-1
The _Fb transmitter 10 of the intermediate device 2-2 mistakenly identifies the _Fb signal from the intermediate device 2-2 as the _Fb signal from the intermediate device 2-2.
It becomes impossible to determine that the unit is malfunctioning. However, in this embodiment, since the frequencies of the response signals of the two groups are made different for F _a and F _b , an abnormality occurs in the F _b transmitter 10 of the intermediate device 2-2 and the F _b signal is generated. When F _a signal is generated from intermediate device 2-1 of another group,
Since this cannot be mistaken for the _Fb signal of the _Fb transmitter 10 of the intermediate device 2-2, it can be accurately determined that there is an abnormality in the _Fb transmitter 10 of the intermediate device 2-2.

Next, a case will be described in which the terminal device 3-1 of the intermediate device 2-1 detects an abnormality. Terminal device 3-1
will stop generating _one signal when it detects an abnormality. Therefore, when the F ₁ receiver 8-1 of the intermediate device 2-1 receives the F ₁ signal, the intermediate device 2-1 sends the F _a signal and the F ₂ to _o signals to the central device 1 . ₂ to
_{The o} signal is received by _{the 1} to _o receivers 23 of the central device 1, and _{the 2} to _o terminals of this receiver 23 are at H level, but _{the 1} terminal is at L level. ₁ terminal L
The level is determined by the NOR circuit 25 via the delay circuit 24-1.
-11. This NOR circuit 25-11 is also supplied with the H level output 1 of the counter 5 inverted to L level by the inverter 26-1, so the output of the NOR circuit 25-11 becomes H level. Instructs that the terminal device 3-1 of the intermediate device 2-1 has detected an abnormality. F _a signal
When 2 seconds have elapsed since the F _a receiver 11 received the signal, the output 1 of the counter 5 is switched from the H level to the H level due to the action of the one shot 6, as described above. . At this time, _one terminal of _{the 1} to _o receivers 23 is switched to the H level unless the terminal device 3-1 of the intermediate device 2-2 detects an abnormality. Intermediate device 2-
FIG. 5 shows a time chart when the terminal device 3-1 detects an abnormality. Other terminal devices 3-2 to 3-n of the intermediate device 2-1, other intermediate devices 2-
Even if _the terminal devices 3-1 to 3-n of ₂ to 2-10 detect an abnormality,
6-1 to 26-10 operate in the same manner. In addition, the F ₁ receiver 8-1 of the intermediate device 2-1
If there is an abnormality in the central device 1 and both _the Fa signal and the ₁ to ₀ signals are not sent to the central device 1, the abnormality indication terminal 21-1 and the NOR circuits 25-11 to 25-1n
The output becomes H level. The same applies to the other intermediate devices 2-2 to 2-10. Further, 27-1 to 27-10 shown in FIG. 2 are light emitting diodes that display which intermediate device is being called.

In the alarm device configured in this way, the F ₁ transmitter 4-1 to the F ₁₀ transmitter 4-10 are used to sequentially call the intermediate devices 2-1 to 2-10, and at that time, the intermediate devices 2-1 to 2- 10 is configured so that it is possible to know which intermediate device or terminal device has an abnormality based on whether or not it sends out F _a signal or F _b signal and signals ₁ to _o . The total of F ₁ to F ₁₀ , F _a , F _b , ₁ to _o is 12+
Only n frequencies are used, which reduces the number of frequencies used. Furthermore, each intermediate device 2-1 to 2-1
Since the terminal devices 3-1 to 3-n attached to 0 can all generate signals ₁ to _o , they can have exactly the same configuration, and the central device can also be a receiver capable of receiving signals ₁ to _o . Since only one unit is required, manufacturing becomes easy. In addition, since the frequency of the response signal that the intermediate device sends to the central device is different for each group of intermediate devices, if an intermediate device in one group, for example 2-2,
Even if for some reason an intermediate device of another group, for example 2-1, generates a response signal of F _a when the response signal of F _b is not generated, this response signal is transmitted to the intermediate device 2-2. Since the response signal is not mistaken for the response signal from the intermediate device 2-2, it can be reliably determined that there is an abnormality in the intermediate device 2-2.

In the above embodiment, five of the ten intermediate devices were configured to send the F _a signal and the remaining five sent the F _b signal as response signals. For example, if there are 12 intermediate devices, The 4 units in the 1st set send the F _a signal, and the 4 units in the 2nd set
The configuration may be such that the four units in the set send out the F _b signal and the four units in the third set send out the F _c signal as response signals. The counter 5 is configured to change its output state in response to the rising pulse of the one shot 6 or the retrigger one shot 7, but the counter 5 automatically changes its output state after a predetermined period of time has elapsed after reaching a certain output state using, for example, a clock oscillator. It may be configured to have the following output state.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the alarm device according to this invention, Fig. 2 is a block diagram of the central device of the alarm device, and Fig. 3 is a time chart when there is no abnormality in each intermediate device and terminal device of the alarm device. Fig. 4 is a time chart when there is an abnormality in the _Fb transmitter of the intermediate device 2-2 of the alarm device, and Fig. 5 is a time chart when the terminal device 3-1 belonging to the intermediate device 2-1 of the alarm device is abnormal. This is a time chart of the detected state. 1...Central device, 2-1 to 2-10...Intermediate device, 3-1 to 3-n...Terminal device, 4-1 to 4-10...Paging transmitter, 8-1 to 8-
10... Call receiver, 9, 10... Response transmitter, 11, 12... Response receiver, 17, 18-1
18, 22...Intermediate device abnormality instruction logic circuit, 23...Normal signal receiver, 25-11 to 2
5-10n, 26-1 to 26-10... Logic circuit for terminal device abnormality indication.

Claims (1)

[Scope of utility model registration request] It consists of a central device, multiple intermediate devices, and n terminal devices attached to each terminal device, and each terminal device itself monitors normal signals of different frequencies assigned to it. It is configured to generate if there is no abnormality, and to stop if there is an abnormality, and each intermediate device receives the one assigned to it among m (m<n) response signals of mutually different frequencies. the central device has a plurality of paging transmitters that sequentially transmit paging signals of different frequencies respectively assigned to each of the intermediate devices;
Each intermediate device has a paging signal receiver that receives the paging signal assigned to it and sends out a response signal from its own response transmitter and a normal signal from its own terminal device, The device is provided correspondingly to m response signal receivers that receive the m response signals, a normal signal receiver that receives the n normal signals, and each of the intermediate devices. an intermediate device abnormality indication logic circuit that receives a response signal assigned to a corresponding intermediate device when the device is being called, and generates an output if the response signal receiver does not receive the response signal; When the intermediate device provided corresponding to each terminal device and attached to the corresponding terminal device is being called, the normal signal receiver does not receive the normal signal from the corresponding terminal device. An alarm device comprising a logic circuit for indicating an abnormality in a terminal device.