JP2003061162A - Remote supervisory control system and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote supervisory control system with which a master station device can discriminate whether carrier interruption is caused by a line fault or power failure of a slave station device when detecting the carrier interruption on a transmission line so as to quickly restore a system fault. SOLUTION: The slave station device 7 transmits data denoting absence of device power supply input voltage to the master station device 1. The master station device 1 has a transmission line carrier interruption detection section and a power failure supervisory timer, receives the data denoting absence of device power supply input voltage sent from the slave station device 7, starts the power failure supervisory timer, and discriminates that power failure takes place in the slave station device on the condition that the carrier interruption of the transmission line is detected before the power failure supervisory timer expires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring control device master station (hereinafter referred to as a master station device) and a remote monitoring control device slave station (hereinafter referred to as a slave station device) connected via a transmission line. In a remote monitoring and control system according to the present invention, the present invention relates to a remote monitoring and controlling apparatus capable of detecting a power failure of a slave station as one of the abnormal states of the slave station in the master station.

[0002]

2. Description of the Related Art Conventionally, in a distant monitoring control system, a master station device and a slave station device are connected by a transmission line, and control data for equipment to be monitored and controlled by equipment such as a supervisory control terminal is controlled by the master station device. It is transmitted to the slave station device via the output and is output from the slave station device to the monitoring control target device. Further, the status display data and the measurement data of the supervisory control target device are input to the slave station device and sent from the slave station device to the equipment such as the monitor control terminal via the master station device. In such a remote monitoring and control system, the master station device constantly monitors the transmission path state or the operating state of the slave station device, and when an abnormality is detected, what kind of abnormality has occurred at which part in the equipment manager I am trying to report it to and take appropriate measures. However, when a power failure occurs in the slave station device, the only information that can be captured by the master station device is that carrier transmission from the slave station device to the transmission path is stopped, which is a cause of carrier disconnection on the transmission path. It is not possible to distinguish between transmission line cable disconnection, slave station device power failure, and modem failure, and it is reported to the equipment manager that the transmission line carrier has been disconnected, and it is not possible to accurately report the abnormal part to the equipment manager. Therefore, as shown in JP-A-6-276302, when a power failure occurs in the slave station device, the device power supply of the slave station device is switched to another power supply such as a battery or the method of transmitting the power failure occurrence to the master station device, or An uninterruptible power supply is installed as a power supply method to the slave station device, and power is supplied.When a power failure occurs, power is supplied to the slave station device by the uninterruptible power supply device, and a power failure is generated from the slave station device to the master station device. The method of sending is taken. In addition, JP-A-7-321883
As shown in No. 6, in order to detect anomalies, a special function such as a parallel / serial converter for standard functions, a modem, a parallel / serial converter, a tone generation circuit, a tone detection circuit, etc. The circuit is added to achieve the purpose.

[0003]

However, in general, for the power supply to the distant monitoring control device, the method shown in JP-A-6-276302 cannot be adopted because the power supply by the battery is insufficient. Further, in the method of transmitting the occurrence of power failure to the master station device by using the uninterruptible power supply device, the size of the slave station device becomes large because the size is large. In addition, JP-A-7-3
In the method shown in No. 21883, in which an abnormality detection circuit is added in addition to the standard circuit for abnormality detection, the entire slave station device becomes large and at the same time many component parts are required, so the device capacity is 20 points or less of control items, Small capacity of 30 items or less and 4 measurement items or less, and equipment mounting space is D200 x W
This system cannot be used in a small-scale system with a space of 400 × H200 or less, and the price is high. Therefore, the system management cost is reduced and the price is required to be lower as the system becomes smaller. Often cannot be adopted by. Therefore, in general, when a power failure occurs in the slave station device, the carrier output from the slave station device to the transmission line is cut off.Therefore, the master station device detects the transmission line carrier disconnection and transmits it to the facility manager. Road abnormalities are reported. Based on this information, the equipment administrator who performs abnormal recovery checks the transmission line and confirms that there is no abnormality on the transmission line, and at the same time, dispatches a slave station device maintenance staff to detect an abnormality in the slave station device. Investigate and check for the first time that there is a power outage. Therefore, there is a drawback that it takes time and effort to recover the abnormal state of the remote monitoring control system.

An object of the present invention is to provide a remote monitoring control system in which a master station device and a slave station device are connected by a transmission line,
It is an object of the present invention to provide a distant monitoring control device that can determine that the cause of the transmission line carrier disconnection detected by the master station device is a power failure of the slave station device, and that enables quick system recovery.

[0005]

In order to achieve the above object, a power failure detection means for inputting a device power input to a slave station device to a device power input voltage input circuit and monitoring this data in a central processing unit, and a power failure. When the data is detected, a device power supply voltage-less data transmitting means for transmitting the voltage-free data over other transmission data is provided. Further, the central processing unit, the transmission circuit unit, and the device power supply input voltage input unit are provided with a device power supply capable of supplying power from the occurrence of a power failure to the completion of device power input voltage no data transmission.
Here, the time from the occurrence of the power failure to the completion of the device power input voltage no data transmission is about 1 second.

The master station device for monitoring the slave station is provided with a transmission line carrier disconnection detecting section for detecting that the carrier transmitted from the slave station is not transmitted in the transmission circuit section, and a data calculating section is provided in the central processing section. In addition to the above, a power failure monitoring timer that can set a timer value that exceeds the time from the occurrence of a power failure of the slave station device to the disconnection of the device power supply output, and the reception of no data of the device power input voltage sent from the slave station device Section and device power supply input voltage no data is received, the power failure monitoring timer is started, and when the power failure monitoring timer times out, it is judged as a slave station device power failure on the condition that carrier disconnection of the transmission path is detected It is achieved by having means.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the distant monitoring control system sends to the monitoring control terminal 2 the monitoring control terminal 2 that performs management operations on the master station device, and the state and measurement value data of the monitoring control target device 17 located far away. The master station apparatus transmission circuit section 6 having the function of detecting the carrier of the transmission path at the same time as performing the data communication between the slave station apparatus 7 and the LAN control section 5 which outputs the control data output from the supervisory control terminal 2 A master station device storage device unit 4 for storing data of the arithmetic unit 3, a data arithmetic unit for performing internal data processing, a data transmission / reception processing unit for transmitting / receiving data to / from a slave station, and a device power source transmitted from the slave station Starts the power failure monitoring timer based on the no input voltage data, and determines when a power failure has occurred in the slave station device when the power failure monitoring timer times out. Data communication is performed with the master station device 1 and the master station device 1, which are composed of the master station device central processing unit 3 having a power failure monitoring timer that starts when receiving a signal and the master station device power supply 18 that supplies power to the circuits in the master station device. Slave station device storage device section 9 for storing data of slave station apparatus transmission circuit section 10 and central processing section 8
And data processing unit that processes data in the equipment, data transmission / reception processing unit that performs data transmission / reception processing with the master station device, and power failure detection based on data from the device power input voltage input section A status display data input unit 14 for inputting status display data of a slave station device central processing unit 8 having a power failure detection processing unit for prompting a data transmission / reception unit to preferentially transmit data without voltage and a monitoring control target device 1
7, an analog data input unit 12 for inputting measurement data, a control data output unit 13 for performing control output to the monitoring control target device 17, an analog data output unit 15 for outputting analog data to the monitoring control target device 17, and a slave station. It is composed of a slave station device 7 composed of a device power source input voltage input section 11 for inputting a device power source input and a slave station device power source 16 for supplying power to an internal circuit of the slave station device, and the master station device 1 and the slave station device 7 are Communication is performed via a transmission line. Here, the slave station device power supply 16 supplies the device power supply input voltage to at least the slave station device storage unit 9, the slave station device central processing unit 8, the slave station device transmission circuit unit 10, and the device power supply input voltage input unit 11 at the time of power failure. It has a voltage output holding function that can supply power until the completion of data transmission.

The operation will be described below.

FIG. 2 shows an operation flow of the slave station device.

When the device power supply input voltage drop occurs in the slave station device 7, the device power supply input voltage presence / absence data input to the device power supply input voltage input section 11 becomes voltageless data. In this state, the data processing unit of the central processing unit 8 performs input processing 31, and the power failure detection processing unit determines 32 whether the device power input voltage presence / absence data is no voltage data. When the device power input voltage no data is received, it is determined that a power failure has occurred, the data transmission / reception processing unit interrupts the data currently being transmitted, and the device power input voltage no data is preferentially subjected to the transmission process 33. Transmission format is cyclic digital telemeter format transmission (hereinafter referred to as CDT format transmission)
In the case of, the data is transmitted to the master station device 1 with the highest priority in the 2-word configuration of the synchronization word + data word. Here, the slave station device power supply 16 has at least the slave station device storage unit 9, the slave station device central processing unit 8, the slave station device transmission circuit unit 10, at the time of a power failure,
Power is supplied to the device power input voltage input unit 11 until the device power input voltage no data transmission is completed. The voltage output holding time from the occurrence of power failure to the completion of transmission of data without power input to the device depends on the transmission specifications, but the transmission format is 1 bit 44 bits CDT format transmission, the transmission speed is 200 bps, the synchronization word + data word 2 When data is transmitted in the word configuration, a maximum transmission completion time of 220 ms during data transmission + device power input voltage-less data transmission (synchronization word + data word) time 440 ms + program processing time 100 ms requires a holding time of about 0.8 s. An example of transmitting the data with voltage as the device power input voltage presence / absence data normal transmission process 34 as a branch of the process 32 is not necessary.

When the master station device 1 receives the device power input voltage-free data transmitted from the slave station device 7 via the transmission circuit section 6, the data transmission / reception processing section of the central processing section 3 performs the data reception processing 41. The power failure determination processing unit determines 42 whether the device power input voltage non-data has been received. If the result of determination is that there is no voltage data, the power failure monitoring timer is activated 43. After that, when the power failure monitoring timer times out 44, the carrier detection result of the transmission path detected by the transmission circuit unit 6 is referred to 45, and if the carrier is disconnected, it is determined that the slave station device is in power failure 46 and monitoring control is performed. It reports 47 to the terminal 2 that a slave station device power failure has occurred. If the carrier detection result of the transmission path detected by the transmission circuit unit 6 indicates that the carrier is not disconnected, the decrease in the input voltage of the device power supply (t1 time shown in FIG. 3A) leads to a decrease in the secondary output of the device power supply. It is judged that there is no instantaneous drop and ignores the data without input voltage to the device power supply. Also, FIG.
-If the device power input voltage drop at t1 time frequently occurs as shown in -a), the device power input voltage no data newly indicating no voltage should be received before the first power failure monitoring timer starts up. Become. In this case, restart the power failure monitoring timer, check the presence of carrier on the transmission path on condition that the power failure monitoring timer time-up after receiving the device power input voltage no data indicating the last no voltage, and detect the power failure. Make a decision.

Japanese Patent Laid-Open No. 62-90074 also discloses a technique for detecting a carrier disconnection and causing a power failure. A separate power supply is attached to a tone oscillator for notifying a slave station of a power failure and a power failure occurs at a master station. At the time of detection, the tone signal and the carrier disconnection are simply ANDed. However, according to the present invention, when the slave station detects a power failure, priority is given to the power failure notification, and when the parent station receives the power failure notification and then detects the carrier disconnection, it performs a time-series process of determining a power failure. This is because the power failure notification sent by the slave station is not sent continuously,
The master station performs time-series processing to make decisions based on this, and with such a configuration of the entire system, it is possible to minimize the power supply of the slave station and achieve miniaturization. Further, by providing a timer, it is possible to deal with a momentary interruption in which the power source on the power system side momentarily falls.

[0014]

As is apparent from the above embodiments, according to the present invention, in a remote monitoring control system in which a master station device and a slave station device communicate with each other via a transmission path, the master station device transmits a transmission path carrier. When the disconnection is detected, it is possible to determine whether the carrier disconnection is caused by the line failure or the slave station device power failure, and the system failure can be quickly recovered.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a remote monitoring control system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a power failure detection flow of the present invention.

FIG. 3 is a diagram showing a slave station device power failure detection timing of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Parent station apparatus, 2 ... Monitoring control terminal, 3 ... Parent station apparatus central processing part, 4 ... Parent station apparatus storage device section, 5 ... LAN control section, 6
... parent station device transmission circuit unit, 7 ... slave station device, 8 ... slave station device central processing unit, 9 ... slave station device storage device unit, 10 ... slave station device transmission circuit unit, 11 ... device power input voltage input unit, 12 ... Analog data input section, 13 ... Control data output section, 14 ... Status display data input section, 15 ... Analog data output section, 1
6 ... Slave station power supply, 17 ... Monitoring and control target equipment, 18 ... Master station power supply.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroto Nakai             Hitachi 2-3-1, Saiwaicho, Hitachi-shi, Ibaraki             Engineering Co., Ltd. (72) Inventor Takeshi Ejiri             5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture             Information Control Systems Division, Hitachi, Ltd.             Within F term (reference) 5C086 AA32 BA13 CA02 DA06 EA05                       EA45 FA18                 5K048 DA02 DC04 EA11 EB13 FC01                       GB06 HA01 HA02

Claims (3)

[Claims] 1. A remote monitoring control device slave station for inputting monitoring data from a remote monitoring control target device and outputting control data to the monitoring control target device, and transmission with the remote monitoring control device slave station. In a distant monitoring control system composed of a distant monitoring control device master station connected via a road, the distant monitoring control device slave station detects a power failure due to a decrease in the power supply voltage of its own station, and the power failure detecting means. When a power failure is detected by the detection means, it has a device power supply voltage non-data transmission means for transmitting non-voltage data in preference to other data, and the remote monitoring control device master station is from the remote monitoring control device slave station. A remote monitoring control system having a power failure determination processing unit that determines that the remote monitoring controller slave station is in a power failure on condition that carrier disconnection of the transmission path is detected after receiving the no-voltage data. 2. A remote monitoring control device slave station for inputting monitoring data of a remote monitoring control target device and outputting control data to the monitoring control target device, the remote monitoring control device slave station, and a transmission line. In the distant monitoring control system configured with the distant monitoring control device master station connected via the remote monitoring control device slave station, the distant monitoring control device slave station detects a power failure due to a decrease in the power supply voltage of the local station and the power failure detection means. When a power failure is detected by means, it has a device power supply voltage non-data transmission means for transmitting non-voltage data in preference to other data, the remote monitoring control device master station, the remote monitoring control device slave station from the remote monitoring control device If a power failure monitoring timer that counts a preset time when no voltage data is received and the power failure monitoring timer has timed out and has detected the carrier disconnection of the transmission path, Remote monitor control system having a power failure detection unit that determines that a power failure monitoring control slave station. 3. A remote monitoring control device slave station for inputting monitoring data of a monitoring control target device located at a distant position and outputting control data to the monitoring control target device detects a power failure due to a decrease in the power supply voltage of its own station. However, when a power failure is detected, the voltage-free data is transmitted in preference to other data, and the remote monitoring control device master station connected to the remote monitoring control device slave station via a transmission line is the remote monitoring control device. A distant monitoring control method for determining that the distant monitoring control device slave station is out of power on condition that the carrier disconnection of the transmission line is detected after receiving the no-voltage data from the slave station.