JP4369080B2 - Repeater and disaster prevention system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a repeater and a disaster prevention system.
[0002]
[Prior art]
FIG. 1 is a diagram illustrating a configuration example of a conventional disaster prevention system. Referring to FIG. 1, terminal devices 2, 2,... Such as sensors are connected to the receiver 1 via transmission lines L. That is, in the example of FIG. 1, the transmission line L is branched and the terminal devices 2, 2,... Are connected to the branch line of the transmission line L.
[0003]
In the disaster prevention system having such a configuration, the receiver 1 and each terminal device 2, 2,... Transmit and receive information by transmitting and receiving transmission signals through the transmission line L. Specifically, for example, when a terminal device 2, 2,... Such as a detector detects a fire or a failure, this is notified to the receiver 1 via the transmission line L.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional disaster prevention system described above, when a phenomenon occurs in which an abnormal return signal (transmission signal) is returned from the terminal device 2 to the receiver 1 due to a failure of a transmission interface of a certain terminal device 2, There is a possibility that a normal transmission signal (return signal) from the terminal device 2 cannot be sent to the receiver 1, the receiver 1 cannot be received normally, or normal transmission from the receiver 1 is affected. . That is, a failure of one terminal device 2 adversely affects the entire system. In addition, such an abnormal return signal from the terminal device 2 may be continuously generated. In this state, the receiver 1 must detect a failure every time an abnormality occurs and constantly perform failure processing related to the abnormality.
[0005]
An object of the present invention is to provide a repeater and a disaster prevention system that can prevent the influence of an abnormal return signal from a terminal device on a receiver or the like.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a repeater that is provided between a receiver and a terminal device and has a function of relaying signal transmission between the receiver and the terminal device. When the return signal from the terminal device is monitored and an abnormality is detected in the return signal from the terminal device, the return signal from the terminal device in which the abnormality is detected is sent to the receiver, or an abnormality is detected. While the transmission of return signals from all terminal devices connected to the branch wiring to the receiver is blocked , the transmission from the receiver to the terminal device is not blocked. It is said.
[0013]
Further, an invention according to claim 2, wherein, in 1 Symbol placement of repeater claims, when the return signal from the terminal device is detected to be abnormal, a display unit that displays that an abnormality has occurred It is characterized by being.
[0014]
According to a third aspect of the present invention, in the repeater according to the second aspect of the present invention, as the display unit, a display that displays a history of occurrence of an abnormality even after the restoration of an abnormality is used.
[0015]
The invention according to claim 4 is a disaster prevention system comprising a receiver, the repeater according to any one of claims 1 to 3 , and a terminal device, wherein the repeater is The transmission line from the receiver is provided at a branch point with the terminal device.
[0016]
The invention according to claim 5 is characterized in that, in the disaster prevention system according to claim 4, an address is given to the repeater and address polling is performed from the receiver .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a diagram showing a configuration example of the disaster prevention system according to the present invention. In FIG. 2, the same parts as those in FIG. Referring to FIG. 2, this disaster prevention system performs signal transmission between the receiver 1 and the terminal devices 2, 2,... Between the receiver 1 and the terminal devices 2, 2,. The repeaters 3, 3,... Having a relay function are connected to each other.
[0018]
More specifically, the repeaters 3, 3,... Are provided at the branch points of the transmission line L from the receiver 1 to the terminal devices 2, 2,. Further, the terminal devices 2, 2,... Are connected to branch lines from the repeaters 3, 3,.
[0019]
FIG. 3 is a diagram showing a configuration example of the repeater 3 of the present invention. Referring to FIG. 3, the repeater 3 is connected to the receiver 1 on the primary side and to the terminal devices 2, 2,... On the secondary side. The repeater 3 includes a primary side receiving unit 11 that receives a transmission signal from the receiver 1, a primary side transmitting unit 12 that transmits a transmission signal to the receiver 1, and terminal devices 2, 2,. A secondary side receiver 13 that receives a transmission signal (return signal), a secondary side transmitter 14 that transmits the transmission signal to the terminal devices 2, 2,..., And a signal processor 15 that controls the entire repeater 3. And are provided.
[0020]
Here, the primary side receiving unit 11 and the primary side transmitting unit 12 are connected to the primary side (receiver side) transmission line and to the signal processing unit 15.
[0021]
Further, the secondary side receiving unit 13 and the secondary side transmitting unit 14 are connected to a secondary side (terminal device side) transmission line (branch wiring) and to a signal processing unit 15.
[0022]
The signal processing unit 15 includes a CPU 21, a ROM 22, a RAM 23, and the like.
[0023]
Further, the signal processing unit 15 includes a display unit (abnormal response failure lamp and abnormal response failure history light) 16 for displaying various information related to the occurrence of an abnormality, an operation unit 17 provided with a switch for performing a reset operation, an address And a setting unit (for example, a DIP switch) 18 for setting an operation mode is connected.
[0024]
Here, the address is used to specify the repeater 3 to be called from the receiver 1 when address polling is performed from the receiver 1. In addition, as described later, the operation mode is connected to, for example, a return signal from a terminal device in which an abnormality has been detected, sent to a receiver, or a branch line from a repeater that has detected an abnormality in a return signal. After blocking the return signals from all the terminal devices to the receiver, if the return signals from the terminal devices return to normal, the return signals from the terminal devices in which an abnormality has been detected are returned to the receiver. Canceling the transmission of the signal, canceling the blocking of the transmission of the return signal from all the terminal devices connected to the branch wiring where the abnormality is detected, or from the terminal device where the abnormality is detected Or a return signal from all terminal devices connected to the branch wiring from the repeater that has detected an abnormality in the return signal.
[0025]
The repeater 3 having such a configuration includes a receiver 1 connected to a primary side (receiver side) transmission line and terminal devices 2, 2,... Connected to a secondary side (terminal device side) transmission line. Has a function of relaying signal transmission between the two. That is, basically, when the transmission signal from the receiver 1 is received by the primary side reception unit 11, the repeater 3 transmits this transmission signal from the secondary side transmission unit 14 to the terminal devices 2, 2,. When the transmission signal (return signal) from the terminal devices 2, 2,... Is received by the secondary side receiving unit 13, this transmission signal (return signal) is transmitted (returned) from the primary side transmitting unit 12 to the receiver 1. It has a function.
[0026]
By the way, when a transmission signal (return signal) from a certain terminal device 2 becomes abnormal due to a failure of the terminal device 2, etc., this abnormal transmission signal (return signal) is transmitted (returned) to the receiver 1. In this case, as described above, a normal transmission signal (return signal) from another terminal device 2 cannot be sent to the receiver 1, the receiver 1 cannot be received normally, or the normal signal from the receiver 1. May also affect other transmissions. That is, a failure of one terminal device 2 adversely affects the entire system.
[0027]
In order to avoid such a problem, the repeater 3 of the present invention monitors the return signals from the terminal devices 2, 2,... And detects an abnormality in the return signals from the terminal devices 2, 2,. Sends the return signal from the terminal device 2 in which an abnormality is detected to the receiver 1 or returns the return signals from all the terminal devices connected to the branch wiring in which the abnormality is detected to the receiver 1. The transmission is cut off.
[0028]
As described above, when an abnormality is detected in the return signals from the terminal devices 2, 2,..., The transmission of the return signal from the terminal device 2 in which the abnormality is detected to the receiver 1 is blocked. It is possible to reliably prevent a failure of the terminal device 2 from adversely affecting the entire system. In other words, when a plurality of terminal devices are connected, communication with a normal terminal device is possible, so that a return signal from a normal terminal device is not blocked.
[0029]
In addition, when an abnormality is detected in the return signals from the terminal devices 2, 2,..., Receivers 1 for the return signals from all the terminal devices 2, 2,. By shutting off the transmission to the relay unit 3, even if an abnormality occurs in the terminal equipment or branch wiring connected to the repeater 3, only the return signal from the abnormal point is cut off. Will not be affected. Furthermore, since only the abnormal part is blocked, the other systems can perform processing as usual.
[0030]
Here, the detection of the abnormality of the return signal in the repeater 3 is specifically performed as follows.
[0031]
That is, as a first method, when the return signal from the terminal device is detected in a time zone when the return signal from the terminal device should not be returned, the repeater 3 detects that the return signal from the terminal device is abnormal. Can be determined.
[0032]
Alternatively, when the return signal from the terminal device is composed of a plurality of bit strings and at least one bit of the plurality of bit strings is formatted at a low level, a low-level bit is detected in the return signal from the terminal device. If not, it can be determined that the return signal from the terminal device is abnormal.
[0033]
Alternatively, when a return data area is provided for a return signal from the terminal device with respect to a transmission signal from the receiver 1, a portion that should originally be at a low level is included in the return signal from the terminal device in the return data area. When the low level is not detected, it can be determined that the return signal from the terminal device is abnormal.
[0034]
4, 5, and 6 show examples of time charts relating to communication between the receiver 1 and the terminal devices 2, 2,... 4 shows an example of a format of a transmission signal (a transmission signal (control signal) from the receiver 1, a return signal from the terminal device 2), and FIG. 5 is a diagram showing a normal return signal. FIG. 6 is a diagram showing an abnormal return signal.
[0035]
First, referring to FIG. 4, the return data area is the area from the end of the instruction to the stop, that is, the area 57-92. Data is transmitted according to the presence or absence of a return current in the portions 58, 62, 66, 70, 74, 78, 82, 86, 90 (marked by X) in this area.
[0036]
Further, in FIG. 5 showing a normal return signal, the blacked out portion shows data.
[0037]
Further, referring to FIG. 6 showing an abnormal return signal, the return current is also on the portions 60 and 80 where there is originally no data (no return current). As described above, when the current is detected in the portion where the current does not originally exist, the repeater 3 can determine that the return signal is abnormal. That is, it is possible to determine that an abnormality has occurred when a location that should originally be at a low level is not detected as a low level. More specifically, for example, when the situation where the low level cannot be detected continuously occurs, the return signal can be determined to be abnormal.
[0038]
In addition, when the repeater 3 is set to the first operation mode, when the abnormality is detected in the return signal, the repeater 3 sends the return signal from the terminal device 2 in which the abnormality is detected to the receiver 1, Alternatively, transmission of the return signals from all the terminal devices connected to the branch wiring from the repeater that detected the abnormality of the return signal to the receiver 1 is interrupted, and then the return signal from the terminal device 2 is transmitted. When it returns to normal, it is connected to the branch wiring from the repeater that detected the return signal from the terminal device 2 from which the abnormality was detected to the receiver 1 or the return signal was detected as abnormal. The blocking of transmission of return signals from all terminal devices to the receiver 1 is released. In this first operation mode, when the return signal returns to normal, the interruption is released, so that the normal monitoring state can be immediately established when the failure is recovered.
[0039]
Further, when this is set to the second operation mode, the repeater 3 detects a return signal from the terminal device 2 in which an abnormality is detected or an abnormality in the return signal when an abnormality is detected in the return signal. Return signals from all the terminal devices connected to the branch wiring from the detected repeater are cut off continuously. In the second operation mode, since the return signal is continuously cut off, the safety can be further improved.
[0040]
In the present invention, the repeater 3 monitors the return signals from the terminal devices 2, 2,..., And when an abnormality is detected in the return signal, the repeater signal of the terminal device 2 from which the abnormality is detected is detected. While the transmission to the receiver 1 or the transmission of the return signals from all the terminal devices connected to the branch wiring where the abnormality is detected to the receiver 1 is cut off, The transmission to 2, ... is not blocked. As described above, since transmission from the receiver 1 to the terminal devices 2, 2,... Is not blocked, when the terminal device is restored from the abnormal state to the normal state, the operation of the disaster prevention system is performed. Immediately normal condition can be achieved.
[0041]
In the present invention, when the return signal from the terminal device 2 is detected as abnormal, the repeater 3 displays on the display unit 16 that the abnormality has occurred. In this way, when it is detected that the return signal from the terminal device 2 is abnormal, the fact that the abnormality has occurred is displayed on the display unit 16, for example, the relay to which the terminal device in which the abnormality has occurred is connected. Recognition of the vessel becomes easy. Here, the display unit (indicator lamp) 16 may be lit when an abnormality occurs, but is continuously lit when an abnormality occurs (it is continuously lit even after recovery). Then, it becomes easier to recognize the faulty part. That is, as the display unit 16, a display unit that displays a history indicating the history of occurrence of abnormality even after recovery from an abnormality can be used.
[0042]
Next, the operation of the repeater 3 having such a configuration will be described. When the disaster prevention system is started and the repeater 3 is powered on, the signal processing unit 15 of the repeater 3 first recognizes the address and operation mode of the repeater 3 from the setting state of the setting unit 18.
[0043]
Then, the signal processing unit 15 of the repeater 3 determines whether the set address is 00 or any other address. If it is 00, the signal processing unit 15 operates in the non-addressable mode (address not set). Operates in addressable mode. In both modes, the basic abnormality monitoring process is the same.
[0044]
Thereafter, when the primary side receiving unit 11 of the repeater 3 receives the transmission signal (control signal) from the receiver 1 via the primary side transmission line, the transmission signal (control signal) is transmitted to the signal processing unit 15 and the second signal. This is given to the secondary transmission unit 14. And the secondary side transmission part 14 transmits this transmission signal (control signal) to the predetermined | prescribed terminal device 2,2, ... via a secondary side transmission line.
[0045]
In this way, after the transmission signal (control signal) from the receiver 1 is sent from the repeater 3 to the predetermined terminal devices 2, 2,..., The return signal from the predetermined terminal devices 2, 2,. When the secondary side receiving unit 13 of the repeater 3 receives via the secondary side transmission line, the received return signal is given to the signal processing unit 15 and the primary side transmitting unit 12.
[0046]
The signal processing unit 15 constantly monitors the reception state of the return signal at the secondary side reception unit 13, and when the signal processing unit 15 determines that the return signal is normal, the primary side transmission unit 12 performs a normal process of transmitting the return signal to the receiver 1 via the primary transmission line.
[0047]
On the other hand, when a return signal is detected in a time zone when the return signal should not be returned, the signal processing unit 15 determines that the return signal is abnormal.
[0048]
Alternatively, when it is detected that the return signal is not in a predetermined format, for example, even when a low level is not detected in the return signal, the signal processing unit 15 determines that the return signal is abnormal.
[0049]
Alternatively, when a return data area is provided for a return signal from the terminal device 2 with respect to a transmission signal from the receiver 1, a portion that should originally be at a low level in the return signal in the return data area is a low level. Even if not detected, the signal processing unit 15 determines that the return signal is abnormal.
[0050]
As described above, when the signal processing unit 15 determines that the return signal from the terminal device 2 is abnormal, the signal processing unit 15 prevents the primary side transmission unit 12 from transmitting the return signal to the receiver 1. By controlling the primary side transmission unit 12, transmission of the return signal determined to be abnormal to the receiver 1 is blocked.
[0051]
When the signal processing unit 15 of the repeater 3 detects an abnormality in the return signal, the signal processing unit 15 turns on the abnormal response failure lamp and the abnormal response failure history light on the display unit 16.
[0052]
Note that the signal processing unit 15 of the repeater 3 sends the transmission signal (control signal) from the receiver 1 to the terminal devices 2, 2,. Can do. That is, transmission of the transmission signal (control signal) from the receiver 1 to the terminal devices 2, 2,. When the transmission signal (control signal) from the receiver 1 is sent to the terminal devices 2, 2,..., The disaster prevention system is used when the terminal device is restored from the abnormal state to the normal state. Can immediately return to normal operation.
[0053]
Further, the signal processing unit 15 of the repeater 3 performs control according to a preset operation mode when the return signal is no longer in an abnormal state (when the normal return signal is restored). In other words, the blocking of sending the return signal to the receiver is canceled or continuously blocked according to the preset operation mode.
[0054]
That is, when the operation mode is set to the first operation mode, the repeater 3 sends the return signal to the receiver when the return signal is no longer in an abnormal state (when the normal return signal is restored). Release the blocking of sending. In this case, the abnormal response failure lamp is turned off. Thus, in the first operation mode in which the interruption is released when the return signal returns to normal, it is possible to immediately enter the normal monitoring state when the failure is recovered.
[0055]
Further, when the operation mode is set to the second operation mode, the repeater 3 receives the return signal even when the return signal is no longer in an abnormal state (when the return signal is restored to the normal return signal). The transmission to the machine 1 is continuously cut off. In this case, the interruption can be released by performing a reset operation by a reset switch (or control from the receiver 1) provided in the operation unit 17 of the repeater 3. In addition, the abnormal response failure history lamp is turned off by this reset operation.
[0056]
Thus, in the second operation mode in which the return signal is continuously cut off, the safety can be further increased.
[0057]
2 and 3, when an address is set in the repeater 3 (when the repeater 3 is set in the addressable mode), a transmission signal from the receiver 1 ( Control signals) can be used to collect information on the occurrence of an abnormality, change the setting mode (whether or not to continuously shut off the return signal in the event of an abnormality, etc.), a reset operation, and the like.
[0058]
Further, when the repeater 3 is connected to the branch point of the transmission line L as in the disaster prevention system of FIG. 2, the influence of the occurrence of abnormality on the system can be minimized.
[0059]
Furthermore, when an address is given to the repeater 3 and the repeater 3 is controlled from the receiver 1 by address polling, the receiver 1 checks the abnormal state and controls the repeater 3. Can do.
[0060]
【The invention's effect】
As described above, according to the invention of claim 1 Symbol placement, provided between the receiver and the terminal device, the relay device having a function of relaying a signal transmission between the receiver and the terminal devices If the return signal from the terminal device is monitored and an abnormality is detected in the return signal from the terminal device, the return signal from the terminal device in which the abnormality is detected is sent to the receiver, or an abnormality is detected. Since transmission of return signals from all terminal devices connected to the detected branch wiring to the receiver is blocked, it is possible to prevent the influence of abnormal return signals on the receiver. be able to.
[0066]
In particular, according to the first aspect of the invention, the return signal from the terminal device is monitored, and when an abnormality is detected in the return signal, the return signal from the terminal device in which the abnormality is detected is sent to the receiver. Or, the transmission of the return signal from all the terminal devices connected to the branch wiring where the abnormality is detected to the receiver is cut off, but the transmission from the receiver to the terminal device is not cut off. Therefore, when the terminal device is restored from the abnormal state to the normal state, the operation of the disaster prevention system can be immediately set to the normal state.
[0067]
Further, according to claim 2, in the invention described in claim 3, in 1 Symbol placement of repeater claims, when the return signal from the terminal device is detected to be abnormal, a display unit that displays that an abnormality has occurred Therefore, for example, it becomes easy to recognize a repeater to which a terminal device in which an abnormality has occurred is connected.
[0068]
Moreover, according to invention of Claim 4, Claim 5 , It is a disaster prevention system provided with the receiver, the repeater as described in any one of Claim 1 thru | or 3 , and a terminal device. Since the repeater is provided at the branch point of the transmission line from the receiver to the terminal device, the influence of the occurrence of the abnormality on the system can be minimized.
[0069]
In particular, in the invention according to claim 5 , in the disaster prevention system according to claim 4 , since the address is given to the repeater and the address polling is performed from the receiver, an abnormality is detected from the receiver. It is possible to check the status and control the repeater.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a conventional disaster prevention system.
FIG. 2 is a diagram showing a configuration example of a disaster prevention system according to the present invention.
FIG. 3 is a diagram illustrating a configuration example of a repeater according to the present invention.
FIG. 4 is a diagram illustrating a time chart regarding communication between a receiver and a terminal device.
FIG. 5 is a diagram illustrating a time chart regarding communication between a receiver and a terminal device.
FIG. 6 is a diagram showing a time chart regarding communication between a receiver and a terminal device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receiver 2 Terminal equipment 3 Repeater L Transmission line 11 Primary side receiving part 12 Primary side transmitting part 13 Secondary side receiving part 14 Secondary side transmitting part 15 Signal processing part

Claims (5)

A repeater that is provided between the receiver and the terminal device and has a function of relaying signal transmission between the receiver and the terminal device, monitors a return signal from the terminal device, and returns from the terminal device. When an abnormality is detected in the signal, the return signal from the terminal device in which the abnormality is detected is sent to the receiver, or the return signal from all terminal devices connected to the branch wiring in which the abnormality is detected The repeater is characterized in that the transmission from the receiver to the receiver is cut off while the transmission from the receiver to the terminal device is not cut off . In claim 1 Symbol placement of the repeater, a repeater, characterized in that the return signal from the terminal device when it detects as abnormal, and a display unit for displaying that the abnormality has occurred. The repeater according to claim 2 , wherein the display unit is a display that displays a history indicating a history of occurrence of an abnormality even after recovery from an abnormality. A disaster prevention system comprising a receiver, the repeater according to any one of claims 1 to 3 , and a terminal device, wherein the repeater is a terminal device of a transmission line from the receiver. A disaster prevention system characterized by being provided at a branch point. 5. The disaster prevention system according to claim 4 , wherein an address is given to the repeater, and address polling is performed from the receiver.

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