JPH06339185A - Digital controller - Google Patents

Abstract

(57) [Summary] [Object] To propose a digital controller 1 having means for not sending a false equipment information signal to the monitor controller 8 when the power switch 2 is turned off. [Structure] The digital arithmetic unit 5 includes a power supply monitoring circuit 51.
And a data transfer availability determination circuit 52. [Effect] When the power switch 2 is opened, the power supply monitoring circuit 51 immediately stops the output of the normal state signal 12 based on the power supply information 11 that the power supply voltage has dropped. The output of the transfer facility information 13 to the determination circuit 53 can be interrupted. Therefore, even if
Even if the power supply voltage supplied from the power supply device 3 to the digital processing device 5 drops gently, and even if the digital processing device 5 can be operated for a while, it is possible to prevent transmission of false equipment information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital control device and a supervisory control device for monitoring the operation of a power system based on information from the digital control device, and more particularly, when the power source of the digital control device is turned off. The present invention relates to means for preventing an extra false signal that is erroneously determined to be an abnormality in the equipment or power system to be monitored from being transmitted from the digital control device side to the monitoring control device side.

[0002]

In recent years, due to the progress of digital technology and transmission technology, a digital control system using digital technology and a local area network, so-called LAN, has been put to practical use in the field of supervisory control devices such as electric stations. And is becoming the mainstream of supervisory control systems. In addition, as a result of applying digital technology and transmission technology, the functionality has been significantly improved compared to conventional systems.

In this type of supervisory control system, it is necessary to prevent the influence of power interruption of the digital controller from affecting the supervisory control of the equipment.

Therefore, it was developed in consideration of application to general communication devices, not to the supervisory control system.
It is conceivable to apply the power interruption monitoring method shown in 63-166325, Japanese Patent Laid-Open No. 4-79434, Japanese Patent Laid-Open No. 4-132323, etc. to the monitoring control system as it is.

In these power interruption monitoring methods, a power failure information signal is sent from the side where the power failure occurs, and the power failure of the other party is detected by the power failure information signal at the receiving side, and a power failure alarm is generated to notify the power failure. It is intended to identify a failure due to an abnormality in the signal processing unit or a signal disconnection due to a transmission path failure.

However, even with these power failure monitoring methods, there are cases where it is not possible to distinguish between power failure and a failure due to an abnormality in the signal processing section or a signal failure due to a transmission path failure.

For example, in the conventional digital control device shown in FIG. 2, the equipment 6 to be controlled and the input processing device of the equipment information, that is, the A / D converter 4 such as DC 110.
Generally, the power source of V and the power source of, for example, DC 5V and 24V of the digital arithmetic unit 5 including the circuit 53 and the transmission circuit 54 that determine the state of the digitally converted equipment information are different. Of these, the power supply voltages of DC5V and 24V are generated by converting the power supply voltage of DC110V by the power supply device 3.

The power supply unit 3 is generally DC 5V and 2V.
A charge accumulating means such as a large capacitor or a voltage smoothing means is built in a portion for generating a constant voltage of 4V. With such a power supply configuration, when the power switch 2 is turned off, the power supply voltage on the side of the facility 6 to be controlled and the input processing device 4 is DC 11
It immediately drops from 0V to 0V, but due to the influence of the charges accumulated in the large capacitor, the digital arithmetic unit 5
The DC 5V and 24V power supply voltages gradually decrease. Therefore, the equipment information 1 about the equipment 6 till then
Even if 0 is normal, when the voltage immediately drops from 110V DC to 0V, a false 0V signal passes through the digital arithmetic unit 5 as it is before the power-off signal as in the above-mentioned conventional example is output. There is a drawback that it is transmitted to the monitoring control device 8 side and is erroneously determined to be an abnormality of equipment. Further, in this case, there is no measure for discriminating between the power failure and the failure due to the abnormality of the signal processing unit or the signal failure due to the transmission path failure.

In order to fundamentally solve this drawback, the receiving side that receives the power-off signal should not judge the abnormality of the transmitting side, but should prevent the transmitting side from sending a false signal.

An object of the present invention is to turn off the power switch.
The object is to propose a digital control device equipped with means for not sending a false signal to the other party.

[0011]

In order to achieve the above object, the present invention provides a power switch for supplying or shutting off power to instrumentation equipment of controlled equipment, and an equipment for fetching equipment information of the equipment. A digital arithmetic unit including means for controlling and means for transmitting the previous equipment information to an external supervisory control device;
A digital control having a power supply device for converting the power supplied from the power supply through the power switch to the power of the voltage required for the operation of the digital arithmetic unit by the conversion means including the charge storage means, the voltage smoothing means, etc. In the device,
Power supply monitoring means that monitors the power supply voltage supplied to the instrumentation equipment and outputs a normal state signal as long as it is within the normal range, and equipment information and a normal state signal from the power supply monitoring means are taken in A digital controller provided with means for stopping transmission of facility information to the supervisory controller.

In order to achieve the above object, the present invention further comprises a power switch which supplies or cuts off power to the instrumentation equipment of the equipment to be controlled, and means for taking in equipment information of the equipment and controlling the equipment. A digital arithmetic unit including a means for transmitting equipment information to an external monitoring and control unit, and a conversion unit for converting electric power from a power source supplied through a power switch to a charge accumulating unit or a voltage smoothing unit. In a digital control device having a power supply device for converting and supplying to a power of a voltage necessary for the operation of the power supply device, a power supply monitoring means for monitoring the power supply voltage supplied to the instrumentation device and outputting a normal state signal as long as it is in a normal range. A means for taking in the equipment information and the normal state signal from the power supply monitoring means and transmitting the equipment information in the normal state immediately before when the normal state signal is stopped to an external monitoring control device. Proposes a digital control apparatus characterized by comprising.

In any case, the same power source as that of the instrumentation device is supplied immediately after the power switch between the instrumentation device of the facility to be controlled and the digital arithmetic unit, and the facility information from the instrumentation device is received. It is possible to provide an input processing device for A / D converting to generate digital equipment information and outputting information on the power supply voltage to the instrumentation equipment to the power supply monitoring means.

[0014]

In the present invention, since the digital arithmetic unit is provided with the power supply monitoring circuit and the data transfer availability judgment circuit, the power supply monitoring is performed based on the power supply information that the power supply voltage has dropped when the power switch is opened. The circuit immediately stops outputting the normal status signal indicating that the power supply is normal. In response to the stop of the normal state signal, the data transfer availability determination circuit interrupts the output of the transfer facility information to the state determination circuit. Therefore, even if the power supply voltage supplied from the power supply unit to the digital processing unit drops slowly and the digital processing unit can be operated for a while, it is possible to prevent the transmission of false equipment information to the monitoring control unit side. To be done.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a supervisory control system including an embodiment of a digital controller according to the present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing a system configuration of a supervisory control system including an embodiment of a digital controller according to the present invention. This supervisory control system comprises a digital controller 1, a transmission line 7, and a supervisory controller 8. The digital control device 1 takes in and processes the equipment information of the equipment 6, controls the equipment 6 based on the information, and sends the equipment information to a transmission line 7 such as a LAN.
The supervisory controller 8 takes in the equipment information from the transmission line 7, monitors the equipment 6 and the digital controller 1, and sends necessary control signals to the digital controller 1 and the equipment 6 via the transmission path 7.

The digital controller 1 includes a power switch 2
A power supply device 3, an input processing device 4, and a digital arithmetic device 5. The power switch 2 is, for example, DC110.
The current from the V power source is supplied to or cut off from the digital control device 1 and the instrumentation equipment of the equipment 6. That is, the instrumentation equipment of the facility 6 is supplied with the power of DC 110 V through the power switch 2 of the digital controller 1. The power supply device 3 takes in a power supply of DC110V via the power supply switch 2, and supplies, for example, DC5V and DC24V necessary for the digital arithmetic unit 5 and / or the input processing device 4.
Convert to a constant voltage such as. The output voltage of the power supply device 3 is such that when the power switch 2 cuts off 110 V DC, the supply voltage to the equipment 6 and the input processing device 4 immediately drops to 0 V, compared with the accumulated charge of the internal circuit such as a large capacitor. It gradually decreases due to the influence. The input processing device 4 takes in the equipment information 10 from the equipment 6 and performs A / D conversion to digital equipment information 10D. The digital arithmetic unit 5 includes a state determination circuit 53 and a transmission circuit 54, and sends the digital equipment information 10D to the LAN 7.

The supervisory control device 8 includes a system monitoring board 81 and a C
It comprises a display device 82 such as an RT, an input device 83 such as a keyboard and a switch, an output device 84 such as a printer, and a transmission circuit 85. The configuration of the monitor control device 8 is the same as the conventional one.

The digital controller 1 of this embodiment is different from the conventional one in that the digital arithmetic unit 5 is provided with a power supply monitoring circuit 51 and a data transfer permission / inhibition judging circuit 52. The power supply monitoring circuit 51 takes in the supply voltage immediately after the power supply switch 2 via the input processing device 4 and outputs the normal state signal 12 to the data transfer availability judgment circuit 52 while the predetermined voltage, that is, DC 110 V is supplied. Continue to output.
The data transfer availability determination circuit 52 outputs the digital facility information 10D from the input processing device 4 to the subsequent state determination circuit 53 only when the normal state signal 12 is present.

In the digital controller of the present embodiment constructed as described above, normally, the power of DC 110V is supplied to the instrumentation equipment of the equipment 6 and the input processing device 4 via the power switch 2. , And the power supply device 3. As described above, the power supply device 3 generates constant voltages of 5V and 24V from the voltage of DC 110V, and the digital operation device 5
And the input processing device 4. The input processing device 4 has, in addition to the equipment information 10 of the equipment 6, the power supply information 1 of 110 VDC.
Also capture 1. The power supply monitoring circuit 51 continues to output the normal state signal 12 to the data transfer availability determination circuit 52 as long as the power supply information 11 is within the normal range. On the other hand, the input processing device 4 A / D-converts the equipment information 10 of the equipment 6 and outputs the digital equipment information 10D to the data transfer availability determination circuit 52. The data transfer permission / inhibition determination circuit 52 uses the normal state signal 1
As long as there is 2, the facility information 13 to be transferred to the monitoring control device 8 is updated by fetching the digital facility information 10D, for example, every predetermined time. The transfer facility information 13 is sent to the state determination circuit 53, and is sent from the transmission circuit 54 to the transmission circuit 85 of the monitoring controller 8 via the LAN 7.

In this case, the state discriminating circuit 53 has a function of discriminating the state of the equipment 6 in the digital controller 1, but it is arranged between the data transfer availability discriminating circuit 52 and the transmitting circuit 54. A circuit having a simple register function for temporarily storing the transfer facility information 13 is sufficient as the circuit to be operated. Therefore, the function of discriminating the state of the equipment 6 and the function of temporarily storing the equipment information may be separated.

On the other hand, when the power switch 2 is opened, the power supply of DC 110V is cut off even if the equipment information 10 is normal until that time.
Wrong equipment information 10 will be captured. However, the input processing device 4 also receives the power supply information 11 that the power has been lowered immediately. The power supply monitoring circuit 51 is
The output of the normal state signal 12 is immediately stopped based on the power supply information 11 indicating that the power supply has decreased. When the normal state signal 12 is stopped, the data transfer availability determination circuit 52 suspends the output of the transfer facility information 13 to the state determination circuit 53. Therefore, there is no facility information to be sent from the digital control device 1 to the monitoring control device 8, and even if the voltage drop of the 5V and 24V power supplies from the power supply device 3 is gradual, the digital arithmetic device 5 is in a state where it can operate for a while. Even if it does, the transmission of fake equipment information is prevented.

When the normal state signal 12 is stopped, the data transfer permission / inhibition determination circuit 52 does not interrupt the output of the transfer facility information 13 to the state determination circuit 53, but instead sets the normal data up to that point. It is also possible to keep sending the data to the determination circuit 53, and transfer the normal data up to that time to the monitoring control device 8 while the digital arithmetic device 5 can operate for a while.

Voltage DC110 of the power source in the above embodiment
V, 5V, 24V and the like are merely examples, and the present invention is not limited to these examples. The supplied power is not limited to DC power.

[0024]

According to the present invention, when the power switch is opened, the power monitoring circuit immediately stops the output of the normal state signal based on the power information that the power voltage has dropped.
The data transfer availability determination circuit can suspend the output of the transfer facility information to the state determination circuit. Therefore, even if the decrease in the power supply voltage supplied from the power supply device to the digital processing device or the like is gradual and the digital processing device or the like remains operable for a while, it is possible to prevent transmission of false equipment information. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a supervisory control system including an embodiment of a digital controller according to the present invention.

FIG. 2 is a block diagram showing a system configuration of a supervisory control system including an example of a conventional digital control device.

[Explanation of symbols]

 1 Digital Control Device 2 Power Switch 3 Power Supply Device 4 Input Processing Device 5 Digital Computing Device 51 Power Supply Monitoring Circuit 52 Data Transfer Approval Judgment Circuit 53 Status Judgment Circuit 54 Transmission Circuit 6 Equipment 7 LAN 8 Monitoring Control Device 81 System Monitoring Board 82 CRT 83 Input Device 84 Printer 85 Transmission Circuit 10 Equipment Information 10D Digital Equipment Information 11 Power Supply Information 12 Normal State Signal 13 Equipment Information for Transfer

Claims (3)

[Claims] 1. A power switch for supplying or shutting off power to an instrumentation device of a facility to be controlled, means for fetching facility information of the facility and control of the facility, and transmission of previous facility information to an external monitoring control device. And a conversion unit that converts the electric power from the power supply supplied through the power supply switch to a charge storage unit or a voltage smoothing unit. In a digital control device having a power supply device that converts and supplies power, a power supply monitoring unit that monitors a power supply voltage supplied to the instrumentation device and outputs a normal state signal as long as it is within a normal range, the facility information and the A normal state signal from a power supply monitoring means, and means for stopping transmission of the facility information to the external monitoring control device when the normal state signal is stopped. Digital controller, characterized in that. 2. A power switch for supplying or shutting off power to the instrumentation equipment of the equipment to be controlled, a means for taking in equipment information of the equipment and controlling the equipment, and transmitting previous equipment information to an external monitoring control device. And a conversion unit that converts the electric power from the power supply supplied through the power supply switch to a charge storage unit or a voltage smoothing unit. In a digital control device having a power supply device that converts and supplies power, a power supply monitoring unit that monitors a power supply voltage supplied to the instrumentation device and outputs a normal state signal as long as it is within a normal range, the facility information and the A means for taking in the normal state signal from the power supply monitoring means and transmitting the equipment information in the normal state immediately before when the normal state signal is stopped to the external monitoring control device. Digital control apparatus characterized by comprising and. 3. The digital control device according to claim 1, wherein between the instrumentation device of the facility to be controlled and the digital arithmetic unit, the same instrumentation device is provided immediately after the power switch. An input processing device is provided which receives power supply and A / D-converts equipment information from the instrumentation equipment to generate digital equipment information and outputs information on power supply voltage to the instrumentation equipment to the power supply monitoring means. A digital control device characterized by the above.