JPH06141369A - Remote supervisory equipment - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] When the power failure occurs in the slave station device, the monitoring data is reliably transmitted to the master station device. [Structure] Electric power for operating the slave station telemeter device 2 is supplied from a slave station power supply 3. Slave station power supply 3 is connector 1
It is removably connected to the slave station telemeter device 2 by 0. A battery or an AC power supply device can be used as the slave station power supply 3. The power supply monitoring circuit 18 detects a voltage drop when the slave station power supply 3 is a battery. When these abnormalities are detected, the telemeter transmission circuit 4 and the teleterminal wireless terminal 6 operate by the electric power from the backup battery 27 and transmit the monitoring data stored in the RAM 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring device that constitutes a telemeter system using a digital wireless network or the like.

[0002]

2. Description of the Related Art Conventionally, a secondary pressure of a governor provided on the way of a city gas supply path is remotely monitored by a telemeter system. For such remote monitoring, a digital wireless network called a so-called teleterminal system is preferably used. This is because a slave station device can be installed near a governor or the like to be monitored as necessary to reliably transmit data to a master station device such as a monitoring center.

Communication between the master station device and the slave station device is performed by periodical polling from the master station device or an emergency call from the slave station device.

[0004]

In a remote monitoring device in which a plurality of slave station devices are connected to a master station device via a digital wireless network or the like, the slave station device is generally operated unattended. Therefore, the slave station device needs to perform a reliable operation.
The main causes of impaired operation of the slave station device are a voltage drop in the case of battery operation and a power failure of an alternating current (hereinafter sometimes abbreviated as “AC”) power supply.

An object of the present invention is to provide a remote monitoring device which can immediately send the accumulated monitoring data to the master station device when an abnormality occurs in the power supply to the slave station device.

[0006]

According to the present invention, in a remote monitoring device in which a master station device is wirelessly connected to a slave station device and monitoring data is collected from a monitoring target through the slave station device, the slave station device is predetermined. Memory for storing monitoring data for time, power supply monitoring means for monitoring the power supply state from the power supply, and data communication with the master station device when the power supply voltage drops in response to the output from the power supply monitoring means. When it occurs except in the inside, the remote monitoring device is characterized by including control means for controlling the contents of the memory to be transmitted to the master station device together with the contents of the abnormality.

In a preferred aspect of the present invention, the slave station device includes a power supply connector, and a battery and an AC power supply can be connected to the power supply connector.

[0008]

According to the present invention, in the remote monitoring device, the slave station device wirelessly connected to the master station device periodically collects the monitoring data from the monitoring target. The slave station device includes a memory, a power supply monitoring means, and a control means. Monitoring data for a predetermined time is stored in the memory. The control means, in response to the output from the power supply monitoring means, when an abnormality occurs in which the power supply voltage drops except during data communication with the master station device,
The stored contents of the memory are controlled to be transmitted to the master station device. In the master station device, it is possible to know the abnormality of the power supply in the slave station device and the monitoring data for a predetermined time stored in the memory, depending on the contents transmitted from the slave station device. It is possible to save the stored monitoring data and determine whether or not an abnormality has occurred in the monitoring target.

According to a preferred embodiment of the present invention,
The slave station device includes a power supply connector. Since a battery and an AC power supply can be connected to the power supply connector, the AC / DC power supply is connected when the AC power supply can be easily used at the place where the slave station device is installed, and the battery is connected when the AC power supply is difficult to use. be able to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a schematic electrical configuration of an embodiment of the present invention. In the slave station device 1, the slave station telemeter device 2 is supplied with power from a slave station power supply 3 realized by a battery or an AC / DC power supply device. As the battery, for example, an automobile storage battery is preferably used, and the output voltage thereof is direct current (hereinafter sometimes abbreviated as “DC”) 13.8V. As the AC / DC power supply device, AC13V, which is commercial AC, is rectified to generate DC13.
Convert to 8V. The slave station telemeter device 2 includes a telemeter transmission circuit 4, a power receiving circuit 5, a teleterminal wireless terminal 6, and an LCD display 7 implemented by a liquid crystal display element (hereinafter abbreviated as “LCD”). The teleterminal wireless terminal 6 is connected to a transmitting / receiving antenna 8 and a receiving-only antenna 9. The slave station power supply 3 is detachably connected to the slave station telemeter device 2 via a connector 10. DC13.8V is given via the power supply terminal 10a, and the power failure alarm output is given via the power supply monitoring terminal 10b.

Pressure transmitters 11 and 12 for generating monitoring data are connected to the slave station telemeter device 2 via sensor connection connectors 13 and 14, respectively. The sensor connection connectors 13 and 14 are connected to the telemeter transmission circuit 4 via barrier terminals 15 and 16 that electrically insulate and transmit only signals.

In the power receiving circuit 5, a booster circuit 17, a power monitoring circuit 18 which is a power monitoring means, and a constant voltage circuit 1 are provided.
9 are included. The booster circuit 17 is realized by a switching regulator or the like, and DC1 from the slave station power supply 3 is supplied.
Boost 3.8V to 24V DC. This DC24V is
It is a voltage required to operate the pressure transmitters 11 and 12.

In the telemeter transmission circuit 4, a central processing unit (hereinafter abbreviated as "CPU") 20, which is a control means,
Random access memory (hereinafter abbreviated as "RAM")
21, read-only memory (hereinafter abbreviated as "ROM") 2
2. Interface circuit (hereinafter abbreviated as "I / F")
23 and timer 24 are included. CPU20 is RO
It operates according to a program preset in M22.

The power supply monitoring circuit 18 monitors the power supply voltage supplied from the slave station power supply 3 through the power supply monitoring terminal 10a,
When an abnormality such as a decrease in the power supply voltage occurs, the CPU 20 as a control means is notified by an interrupt or the like. The constant voltage circuit 19 is provided with a storage battery such as a lithium dry battery or nickel-cadmium as a backup battery 27. When the power supply from the slave station power supply 3 is stopped,
The constant voltage circuit 19 can operate the telemeter transmission circuit 4 and the teleterminal wireless terminal 6 for a certain period of time by the power supplied from the backup battery 27.

FIG. 2 shows a schematic configuration of a gas supply information monitoring system constructed by using the slave station device shown in FIG. Parts corresponding to those in FIG. 1 are designated by the same reference numerals.
The gas supply pipe 28 for supplying the city gas is provided with a governor 29 for adjusting the supply pressure of the gas as needed. An instrumentation facility 30 is installed near the governor 29 to monitor the secondary pressure of the governor 29. The instrumentation equipment 30 includes the pressure transmitter 11 and detects the secondary pressure of the governor. A slave station telemeter device 2 and a slave station power supply 3 are provided near the instrumentation facility 30. The pressure transmitter 11 is supplied with DC 24V from the power receiving circuit 5 in the slave station telemeter device 2, and gives analog data corresponding to the detected pressure to the telemeter transmission circuit 4. This data corresponds to I in FIG.
It is input to the CPU 20 via / F24. Instrumentation equipment 3
At 0, SV data from a contact or the like that opens or closes when the opening degree of the governor becomes abnormally large is also generated. The monitoring stations 31 to 35 including the instrumentation facility 30 and the slave station telemeter device 2 are wirelessly connected to the master station telemeter device 41 via the teleterminal system 40 which is a digital wireless network. Tele terminal system 4
0 and the master station telemeter device 41 may be connected by a wire such as a telephone line. Monitoring station 31-
800M between 35 and Tele-terminal system 40
It is connected by radio waves in the Hz band.

The master station telemeter device 41 is 800 MHz.
A teleterminal wireless terminal 43 is connected to an antenna 42 for transmitting and receiving band radio waves. Teleterminal wireless terminal 43
A personal computer 44 is connected to the. The personal computer 44 includes a cathode ray tube (abbreviated as “CR
Display device 45 such as "T"), keyboard (abbreviation "K")
B ”) and the like, and a printer (abbreviated as“ PR ”)
An output device 47 such as T ″) is connected. Further, the personal computer 44 has a hard disk device (abbreviated as “HD”) built therein as a storage device 48. The teleterminal wireless terminal 43 includes a switching regulator 49.
Powered by. The personal computer 44 and the switching regulator 49 include a commercial AC
100V to constant voltage constant frequency device (abbreviation "CVCF")
AC power whose voltage and frequency are stabilized is supplied via 50.

FIG. 3 shows an example of an AC power source that can be used as the slave station power source 3 shown in FIG. The AC power supplied from the commercial AC power supply 60 is converted into DC by the AC / DC conversion circuit 61, and DC 13.8V is supplied to the slave station telemeter device 2 via the connector 10. The slave station power supply 3 includes a backup battery 62 realized by a nickel-cadmium storage battery or the like. The relay switch 63 is open when the relay coil 64 is excited and closed when the excitation is stopped. Therefore, when the commercial AC power supply 60 fails, the power supply monitoring terminal 1
Power failure information is output to 0b. In the power supply monitoring circuit 18 shown in FIG. 1, the voltage of the power supply monitoring terminal 10b is, for example, 11V.
If it drops below, it is determined that there is a power outage. The connector 10 is also provided with a ground terminal 10c not shown in FIG. When a battery is used as the slave station power supply 3, the positive electrode side is connected to the power supply terminal 10a and the negative electrode side is connected to the ground terminal 10c. The positive electrode is also connected to the power supply monitoring terminal 10b.

FIG. 4 shows the telemeter transmission circuit 4 shown in FIG.
Shows the operation of. When the slave station power supply 3 is composed of a battery, the operation is started from step a1, and it is determined whether or not the battery voltage has dropped.
When the slave station power supply 3 is an AC power supply, it is determined whether or not AC 100V is cut off. When the battery voltage drop is detected, the process proceeds to step a3. When the AC 100V disconnection is detected, the process proceeds to step a6. Step a
At 3, it is determined whether the slave station device is communicating with the master station device. When the slave station device is called by polling from the master station device or when the slave station device is calling the master station device urgently, the teleterminal wireless terminal 6 is in a transmission state and consumes a considerable amount of power. The power supply voltage of the slave station power supply 3 is likely to drop. Unless the slave station power supply 3 is abnormal, the drop in the power supply voltage should be recovered after the end of communication.

When communication is not being performed in step a3, the process proceeds to step a4 and waits for 2 to 3 minutes. This time is measured by the timer 24 shown in FIG. This is to prevent the battery voltage from being determined to be low due to the influence of noise or the like. In step a5, similarly to step a2, it is determined whether or not the battery voltage has dropped. When it is determined in step a3 that communication is in progress, and when it is determined in step a5 that the battery voltage has not dropped, the process returns to step a2. When it is determined in step a5 that the battery voltage is low, the process proceeds to step a6. Step a
In No. 6, the relevant information indicating that the power supply has failed and RA
The accumulated data stored in M21 is transmitted to the master station device. The operation in step a6 is performed by the battery supplied from the backup battery 27 shown in FIG. When this operation ends, the process ends in step a7.

Although the present invention is applied to the gas information monitoring system in the above embodiments, the teleterminal system is used to remotely monitor a moving target mounted on a vehicle or to sell automatically. It goes without saying that the movable state of the machine or the like may be monitored remotely or the operation of various plants may be monitored.

[0021]

As described above, according to the present invention, the power supply state from the power source to the slave station device is monitored except during communication to the master station device, and an abnormality occurs in which the power supply voltage drops. When doing so, the contents of the abnormality and the monitoring for the fixed time stored in the memory of the slave station device are transmitted to the master station device.
Even if the abnormality in the power supply to the slave station device continues and the stored contents of the memory are lost, the master station device side saves the contents, and it is possible to determine whether or not there is an abnormality in the monitoring target. The abnormality of the power supply state may occur in association with the abnormality of the monitored object or may occur independently. The master station device can easily determine whether the abnormality is the power source only or the monitoring target abnormality based on the monitoring data oscillated from the slave station device.

By enabling both the battery and the AC power source as needed, restrictions on the installation location of the slave station device can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic electrical configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a telemeter system including the embodiment shown in FIG.

FIG. 3 is a block diagram showing an electrical configuration of a slave station power supply 3 shown in FIG.

FIG. 4 is a flowchart showing an operation of the telemeter transmission circuit 4 shown in FIG.

[Explanation of symbols]

 1 Slave station device 2 Slave station telemeter device 3 Slave station power supply 4 Telemeter transmission circuit 5 Power receiving circuit 6,43 Tele terminal wireless terminal 8,42 Antenna 10 Power supply connector 17 Booster circuit 18 Power monitoring circuit 19 Constant voltage circuit 20 CPU 21 RAM 27 Backup Battery 28 Gas Supply Pipe 29 Governor 30 Instrumentation Equipment 31 to 35 Monitoring Station 40 Tele Terminal System 41 Master Station Tele Terminal Device 44 Personal Computer 60 Commercial AC Power Supply 61 AC / DC Conversion Circuit 62 Backup Battery 63 Relay Switch 64 relay coil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Sugimoto 4-1-2, Hirano-cho, Chuo-ku, Osaka, Osaka Gas Co., Ltd. No. 1 In Matsushita Communication Industrial Co., Ltd. (72) Inventor Jun Kanda 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd.

Claims (2)

[Claims] 1. The master station device is wirelessly connected to the slave station device,
In a remote monitoring device that collects monitoring data from a monitoring target through a slave station device, the slave station device includes a memory that stores monitoring data for a predetermined time, a power supply monitoring unit that monitors a power supply state from a power supply, and a power supply. In response to the output from the monitoring means, when an abnormality in which the power supply voltage drops occurs except during the data communication with the master station device, the contents of the abnormality and the stored contents of the memory are transmitted to the master station device. A remote monitoring device comprising: a control unit for controlling. 2. The remote monitoring device according to claim 1, wherein the slave station device includes a power supply connector, and a battery and an AC power supply can be connected to the power supply connector.