JP3067526B2 - Power loss monitoring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power-off monitoring method for monitoring a power-off of a device to be monitored in a system in which a device to be monitored and a monitoring control device are connected by an input signal line and an output signal line. In particular, the present invention relates to a power-off monitoring method for monitoring a power-off of a transmission device to which a monitoring control device is connected without a backup power supply.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of a transmission system for explaining a conventional power-off monitoring system of this type. In the figure, reference numeral 1 denotes a transmitting device, 2 denotes a receiving device, 3 denotes a monitoring control device, Reference numeral 4 denotes a large-capacity capacitor, which is provided in each of the transmitting device 1 and the receiving device 2. Hereinafter, the transmission device 1 and the reception device 2 are also referred to as transmission devices. Transmission device 1
In the transmission system that transmits information from the transmission device to the reception device 2, each transmission device is connected to the monitoring control device 3 in order to transmit control information to each transmission device and to monitor transmission errors and operation states of each device. The monitoring device 3 also monitors information such as power-off of each device.

Next, a conventional power-off monitoring method will be described. For example, when the transmitting device 1 is in a power-off state, the power-off information is transmitted to the monitoring and control device. For this reason, a transmission system that switches to a backup battery and transmits the power-off information to the monitoring and control device is also available. However, as shown in FIG. 5, power is stored in the large-capacity capacitor 4 at normal time, and when the power is turned off, the power-off information is transmitted to the monitoring control device using the power stored in the capacitor 4. The transmission system is generally used.

FIG. 6 is a diagram showing a state of communication between the monitoring control device 3 and a transmission device (for example, the transmission device 1).
In the normal state shown in (1), the supervisory control signal NOR is transmitted from the supervisory control device 3 to the transmission device, and the transmission device receiving this returns the operation status report signal STT to the supervisory control device 3 to the supervisory control device 3. I have. Here, when the power of the transmission device is turned off, the power of the transmission device main body is cut off. Therefore, the power stored in the large-capacity capacitor 4 is used as shown in FIG.
As shown by reference numeral 11, the operation state report signal STT (AC-DOWN) for notifying the power-off is transmitted to the monitoring control device 3 several times until the capacitor 4 is completely discharged, and the monitoring control device 3 Upon receiving the STT (AC-DOWN), the power supply of the transmission apparatus is detected as being turned off. When the transmission device is the reception device 2, the power interruption is monitored by the same operation.

[0005]

As described above, the conventional power-off monitoring system is configured to transmit power-off information only with the electric power stored in the capacitor, so that each transmission device has a large capacity. Need to be provided, the occupied area of the capacitor is large, and the size of the transmission device is increased. In addition, since the capacitor is expensive and has a limited power storage capacity, the power-off information can be transmitted only for about several seconds, so that stable and reliable operation cannot be performed. .

As a prior art related to the present invention, for example, in Japanese Patent Laid-Open Publication No. Hei 3-213023, a power-off information transfer method, a device to be monitored and a monitoring control device are connected by an optical fiber. This optical fiber is branched in the device to connect the input fiber and the output fiber, and the branch path is normally closed with an optical shutter when normal.
When the power is turned off, this shutter is opened, the input fiber and the output fiber are connected, and the input optical signal is turned back on the branch path and sent to the monitoring and control device, thereby informing the power cut. However, in this method, the device to be monitored and the monitoring and control device must be connected by an optical fiber, which limits the range that can be implemented, and the configuration is complicated, such as using an optical shutter. In addition, since the power supply is notified by a branched optical signal, the signal output is weak, and there is a problem that the operation lacks stability.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to provide a power-off monitoring method capable of monitoring power-off with a simple configuration without having to equip a battery or a capacitor having a large occupied area. It is an object.

[0008]

According to the power supply interruption monitoring method of the present invention, a relay for automatically connecting an input signal line and an output signal line is provided in the apparatus when the power supply is interrupted, and the input signal line is disconnected when the power supply is interrupted. It is characterized by comprising means for notifying its own power-off by returning the input signal as-is over the output signal line.

Also, in a system in which a device to be monitored and a supervisory control device are connected by an input signal line and an output signal line, a power-off monitoring system for monitoring the power failure of the device to be monitored by the supervisory control device. In the device to be monitored, a relay that automatically connects the input signal line and the output signal line when power is turned off is provided, and the monitoring control signal transmitted from the monitoring control device to the device to be monitored is provided. When returned as it is, the monitoring control device is provided with means for receiving this signal and specifying a power-off of the device to be monitored.

Also, in a system in which a plurality of devices to be monitored and a monitoring control device are connected by input signal lines and output signal lines, the monitoring and control device may switch off the power of the plurality of devices to be monitored. In the power-off monitoring method to monitor,
The plurality of devices to be monitored are provided with a relay for automatically connecting the input signal line and the output signal line when power is cut off, and the monitoring control device is configured to connect to the plurality of devices to be monitored. A monitoring control signal with a flag for identifying the signal is transmitted, and if the transmitted monitoring control signal is returned as it is, the monitoring control device receives this signal, and the monitor whose power is turned off by the flag is received by the flag. It is characterized by comprising means for specifying a target device.

Further, in a power-off monitoring system for monitoring a power-off between transmission devices in a system in which a plurality of transmission devices are connected by an input signal line and an output signal line, each of the transmission devices has a power-off monitoring method. A relay that automatically connects the input signal line and the output signal line is provided, and a flag for identifying the data that is transmitted and received between the transmission devices is attached.If the transmitted data is returned as it is, It is characterized by comprising means for specifying a transmission device that has been powered off by a data flag.

[0012]

In the power-off monitoring method of the present invention, a relay is provided, and when the power is turned off, the input signal input from the input signal line is returned as it is via the output signal line, whereby the power-off of itself can be notified, and the device is backed up. A battery and a capacitor are not required, and the power-off information of the device can be reliably transmitted with a simple configuration.

Further, by providing a relay in the device to be monitored, if the monitoring control signal sent from the monitoring and control device to the device to be monitored is returned as it is, it is possible to identify the power-off of the device to be monitored. With a configuration in which only a relay is provided, the power-off information can be stably and surely notified to the monitoring and control device, and a reliable operation can be performed with a simple configuration, thereby reducing the restrictions on implementation.

A relay is provided for a plurality of devices to be monitored, and the monitoring control device sends a monitoring control signal with a flag for identifying the signal to the plurality of devices to be monitored. When the monitoring control signal is returned as it is, the monitoring control device receives the signal and specifies the monitoring target device whose power is turned off by the flag, thereby connecting a plurality of monitoring target devices. It is possible to detect which device has been turned off in the system.

Further, each transmission device is provided with a relay for automatically connecting the input signal line and the output signal line when the power is turned off, and a flag for identifying the data is given to data exchanged between the transmission devices. In addition, it is possible to mutually monitor the power interruption between the transmission devices.

[0016]

【Example】

Embodiment 1 FIG. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a transmission system for explaining a power-off monitoring method according to the present invention. In the figure, reference numeral 1 denotes a transmitting device, 2 denotes a receiving device, 3 denotes a monitoring control device, 5 denotes an electromagnetic relay, and It is provided in the device 1 and the receiving device 2, respectively. Hereinafter, the transmission device 1 and the reception device 2 are also referred to as transmission devices. As described above, in a transmission system in which information is transmitted from the transmitting device 1 to the receiving device 2, each of the transmitting systems transmits control information to each transmitting device, and monitors transmission errors and operation states of each device. The monitoring and control device 3 is connected to the transmission device, and information such as power-off of each device is also monitored by the monitoring device 3, as in the power-off monitoring method of the present invention.

Next, the operation of the first embodiment will be described. In the power-off monitoring method according to the first embodiment, the monitoring control device 3 individually transmits a monitoring control signal NOR to each transmission device, and the transmission device that has received the monitoring control signal NOR responds to the operation status report signal. The STT is returned to the monitoring and control apparatus 3, and the monitoring and control apparatus 3 transmits a monitoring control signal NOR to the next transmission apparatus if there is no abnormality in the transmission apparatus due to the transmitted STT, and transmits the STT from the next transmission apparatus. It receives and repeats this one by one to monitor a plurality of connected transmission devices.

Here, for example, when the power of the transmitting device 1 is turned off, the electromagnetic relay 5 held by the relay magnet operates due to the power being turned off, and the input signal line and the output signal line are connected in the transmitting device 1. Is connected, and the operation of looping back the monitoring control signal NOR input from the input signal line to the monitoring control device 3 from the output signal line as it is is performed.

FIG. 2 is a diagram showing communication between the monitoring control device 3 and a transmission device (for example, the transmission device 1). In a normal state indicated by reference numeral 10, a monitoring control signal NOR is transmitted from the monitoring control device 3 to the transmission device. The transmission device that has received the notification returns an operation state report signal STT to the monitoring control device 3. Here, when the power of the transmission device is turned off, the power supply of the transmission device main body is cut off, so that the electromagnetic relay 5 automatically operates and connects the input signal line and the output signal line. As a result, as shown by reference numeral 11 in FIG. 2, the monitoring control signal NOR transmitted from the monitoring control device 3 loops back and is returned to the monitoring control device 3 as it is. Can be determined. In addition,
In other transmission devices (for example, the receiving device 2), the power-off can be determined in the same manner.

As described above, the power-off monitoring system according to the present invention has a configuration in which only a relay that automatically operates when the power is turned off is provided in a device to be monitored, and the power-off information is stably and reliably provided by the monitoring control device. 3, a power-off monitoring method that can perform a reliable operation with a simpler configuration than the above-described prior art using an optical fiber and an optical shutter, and requires less restrictions on implementation. can get.

Embodiment 2 FIG. In the above-described first embodiment, it is known which transmission device is performing transmission and reception of the NOR signal and the STT signal between the monitoring control device 3 and each transmission device, that is, a communication agreement that can be called a handshake can be made. Although the power supply monitoring method in the system described above has been described, depending on the system, there is also a system in which the monitoring control device 3 sends monitoring control information to a plurality of transmission devices at random to monitor the transmission device. In the case of such a system, it is not possible to determine which transmission apparatus is powered off simply by returning the NOR signal as in the first embodiment. Therefore, in the second embodiment, the monitoring control signal transmitted from the monitoring control device 3 is provided with an identification code (flag) for identifying the signal.

That is, as shown in FIG. 3, for example, a signal A with an identification bit for specifying the transmitting device 1 is transmitted as a supervisory control signal for the transmitting device 1, and as shown in FIG. The signal B, which is the STT from the transmitting device 1, is returned. When the power is turned off, a signal A that can identify that the transmitting device 1 is
Are continuously returned. Therefore, the monitoring control device 3 always monitors only the identification bit, and when a specific identification bit is continuously detected, it is possible to determine which transmission device has been turned off. It can be detected.

In the first and second embodiments, the transmitting device and the receiving device are described as an example of a device to be monitored for power-off. However, an input signal line and an output signal line are connected to the monitoring control device. It goes without saying that any device may be used as long as the device is connected by.

Embodiment 3 FIG. FIG. 4 is a block diagram for explaining Embodiment 3 of the present invention.
Reference numeral 6c denotes a transmission device. In the above-described first and second embodiments, a system in which each transmission device is connected to the monitoring control device 3 has been described. In the third embodiment, the transmission devices mutually monitor power interruption. An embodiment in which the present invention is applied to a system will be described. That is, similarly to the above-described second embodiment, by adding an identification bit for identifying the data to the data transmitted and received between the transmission devices 6a to 6c, the identification bit is continuously returned. In this case, it is possible to determine which transmission device has been turned off.

In the first to third embodiments, the relay for automatically connecting the input signal line and the output signal line when the power is turned off is described as an electromagnetic relay. It goes without saying that it includes all the relays that operate similarly.

[0026]

As described above, according to the power-off monitoring method of the present invention, a relay is provided in the device, and when the power is turned off, the input signal input from the input signal line is returned as it is via the output signal line, thereby making it possible to monitor its own power. It is possible to provide a small and inexpensive device capable of notifying a power-off, not requiring a backup battery or a capacitor in the device, and capable of reliably transmitting its own power-off information with a simple configuration.

Also, a relay is provided, and when the monitoring control signal sent from the monitoring control device to the device to be monitored is returned as it is, the monitoring control device receives this signal and turns off the power of the device to be monitored. Can be specified and a relay that automatically operates when the power is turned off is provided for the device to be monitored, so that the power-off information can be stably and reliably reported to the monitoring and control device. Operation can be performed, and the restrictions on implementation can be reduced.

A relay is provided for each of a plurality of devices to be monitored, and the monitoring control device sends a monitoring control signal with a flag for identifying the signal to the plurality of devices to be monitored. By using the flag, the device to be monitored that has been powered off can be specified, and in a system to which a plurality of devices to be monitored are connected, which device has been powered off can be detected. Further, even in a communication mode other than the handshake, it is possible to easily detect a device whose power is turned off.

Further, a relay is provided for each of the transmission devices, and a flag for identifying the data is given to the data transmitted and received between the transmission devices, so that the transmission devices can monitor each other for power interruption. There are effects such as becoming.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a system when implementing Embodiments 1 and 2 of the present invention.

FIG. 2 is a diagram for explaining the operation of the first embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the second embodiment of the present invention.

FIG. 4 is a block diagram for explaining a third embodiment of the present invention.

FIG. 5 is a block diagram for explaining a conventional power supply monitoring method.

FIG. 6 is a diagram showing a state of communication in the method shown in FIG.

[Explanation of symbols]

1 transmitter, 2 receiver, 3 supervisory controller, 5
Relay, 6a-6c transmission device, 10 normal transmission / reception mode, 11 power transmission / reception mode.

Claims (2)

(57) [Claims] 1. A system in which a plurality of devices to be monitored and a supervisory control device are connected by an input signal line and an output signal line, and the power supply of the plurality of devices to be monitored is turned off by the supervisory control device. In the power-off monitoring method for monitoring, the plurality of devices to be monitored are each provided with a relay for automatically connecting the input signal line and the output signal line when the power is turned off, and the monitoring control device is provided with the plurality of monitoring control devices. A monitoring control signal with a flag for identifying the signal is transmitted to the devices to be monitored.If the transmitted monitoring control signal is returned as it is, the monitoring control device receives this signal and receives the signal. Means for identifying a device to be monitored whose power has been turned off by a flag. 2. A power-off monitoring method for mutually monitoring power-off between transmission devices in a system in which a plurality of transmission devices are connected by an input signal line and an output signal line. A relay that automatically connects the input signal line and the output signal line is provided, and a flag for identifying the data that is transmitted and received between the transmission devices is attached.If the transmitted data is returned as it is, Means for identifying a transmission device that has been powered off by a data flag.