JPH07319501A - Control protecting device - Google Patents

Abstract

PURPOSE:To provide the control protecting device with which automatic control can be automatically switched to manual control even when a control arithmetic function is normal and further the manual operation can be automatically backed up when the control arithmetic function is abnormal. CONSTITUTION:This device is provided with an input signal processing part 7 for inputting the state of a plant, arithmetic processing part 8 for generating an automatic control signal by performing control arithmetic based on the plant state signal from the input signal processing part 7, output signal processing part 9 for outputting the generated automatic control signal to the plant, and manual operating part 10 for inputting a manual operate signal when the manual operation is required, and the manual operate signal from the manual operating part 10 is transmitted through an operation information transmission bus to the arithmetic processing part 8. When the arithmetic processing part 8 is abnormal, the manual operation is backed up by an I/O bus directly connected from the manual operating part 10 to the output signal processing part 9. Thus, the high-reliability control protecting device can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control and protection device for controlling and protecting equipment such as a nuclear power plant.

[0002]

2. Description of the Related Art FIG. 5 is a system configuration diagram showing a conventional control protection device applied to control equipment of a nuclear power plant, for example. In the figure, 1 is an input signal converter for inputting a plant state such as water level pressure of a plant from a plant detector, 2 is an input device unit for converting a signal from the input signal converter 1 into a digital value, and 3 is an input device unit. An arithmetic unit 4 that performs a control operation based on the signal from 2 is an output device unit that converts the automatic control signal from the arithmetic unit 3 into an analog value for outputting to the plant. Reference numeral 5 denotes a manual operation device connected to the control protection device by a prefabricated cable or the like, which is used by an operator to manually issue a control instruction to the plant. 6
Is an output signal conversion unit that selects either the automatic control signal from the output device unit 4 or the manual operation signal from the manual operation unit 5 and outputs the control signal to the actuator of the plant.

The operation of such a conventional control protection device will be described. A plant state such as a water level pressure of the plant is detected by a detector arranged in the plant, and converted into a voltage value within a certain range in the input signal conversion unit 1. The signal converted into this voltage value is given to the input device section 2 and converted into a digital value here. On the other hand, the signal from the input signal converter 1 is also given to the manual controller 5, and the operator can monitor the state of the plant by outputting the signal to an indicator or the like. When the operator determines that a manual operation is required while monitoring the state of the plant, a manual operation signal is input from the manual operation device 5.

The signal converted into a digital value in the input device section 2 is control-calculated based on a control program given in advance in the calculation section 3, and an automatic control signal as a calculation result is given to the output device section 4 and analogized. Value (voltage)
Is converted to. The output signal conversion unit 6 inputs the automatic control signal converted into the analog value and the manual operation signal from the manual operation device 5, and outputs the automatic control signal during normal operation and the manual operation signal during manual operation by the operator. Select and output to the plant actuator. Further, when an abnormality occurs in the arithmetic unit 3 and the automatic control signal is no longer output, a signal is output from the manual operation unit 5 to the output signal conversion unit 6 so that the system can be backed up.

[0005]

In the conventional control protection device as described above, the manual operation device for manual operation and the control protection device for automatic control are independent, so that the manual operation device and the control protection device are independent. Between the two, it is necessary to make a one-to-one hardware wired connection with a prefabricated cable or the like, which causes a problem that the equipment scale becomes large.
Further, the operator has to monitor many manual operating devices, and when the system is abnormal, it is necessary to switch to the manual operation and input directly from the manual operating device, so the work efficiency of the monitoring and the manual operation is poor.

The present invention has been made to solve the above-mentioned problems, and a first object thereof is to automatically change from automatic control to control by manual operation, even when the control operation function is normal. The purpose of this is to obtain a control protection device that can be switched selectively. A second object is to obtain a control protection device capable of automatically backing up the control by manual operation when the control calculation function is abnormal. A third object is to obtain a simple and inexpensive control protection device.

[0007]

In the control protection device according to the present invention, a manual operation means for inputting a manual operation signal by a manual operation of an operator is provided, and the manual operation means is connected to the arithmetic processing means by a transmission line. It was connected with.

The manual operation means is connected to the output signal processing means by a transmission line.

The output signal processing means has a first input section for inputting a manual operation signal from the manual operation means directly through a transmission line, a second input section for inputting a control signal from the arithmetic processing means, And a selection logic for selecting and outputting either the manual operation signal input to the first input section or the control signal input to the second input section.

The selection logic has a first input section and a second input section.
The signal input to the first input section is preferentially selected from the signals input to the input section and the input section.

Further, the output signal processing means inputs a state signal indicating the state of the arithmetic processing means from the arithmetic processing means, and when the arithmetic processing means is normal, the control signal from the arithmetic processing means is used for the arithmetic operation. A selection logic is provided for selecting a manual operation signal when the processing means is abnormal.

Further, a plurality of arithmetic processing means are provided for one input signal processing means, a plurality of input sections for inputting control signals from the respective arithmetic processing means in the output signal processing means, and input. A selection logic for selecting one of the plurality of control signals is provided.

[0013]

In the control / protection device configured as described above, when manual operation is required, the arithmetic processing means outputs the control signal according to the manual operation signal input from the manual operation means to the output signal processing means.

Further, the manual operation signal from the manual operation means is directly transmitted to the output signal processing means via the transmission line.

The output signal processing means monitors the manual operation signal input to the first input section and the control signal input to the second input section, selects one of them and outputs it to the plant. To do.

The manual operation signal input to the first input section is selected with priority over the control signal input to the second input section.

Further, the output signal processing means selects the control signal from the arithmetic processing means when the status signal from the arithmetic processing means is normal, and selects the manual operation signal from the manual operation means when the status signal from the arithmetic processing means is abnormal, and outputs it to the plant. Output.

The output signal processing means selects one from the control signals from the plurality of arithmetic processing means and outputs it to the plant.

[0019]

【Example】

Example 1. FIG. 1 is a block diagram showing a control protection device according to an embodiment of the present invention, in which an input signal processing unit 7 inputs a plant state from a plant detector and converts it into a plant state signal such as a voltage value. , 8 is an arithmetic processing unit for inputting the plant state signal via an I / O bus which is a multiplex transmission line, and performing a control arithmetic operation to generate an automatic control signal.
Is an output signal processing unit for inputting the generated automatic control signal via the I / O bus and outputting it to the actuator of the plant. Further, reference numeral 10 is a manual operation unit for inputting a manual operation when the operator needs to perform a manual operation, which is composed of an intelligent terminal using a CRT display device or the like. The states of a plurality of plants are separately transmitted to this terminal, and the respective states are displayed by switching the CRT screen or the like. The manual operation signal input from this terminal is transmitted to the arithmetic processing unit 8 via the operation information transmission bus. Further, the manual operation unit 10 is the output signal processing unit 9
Is also connected by an I / O bus.

The operation of the control / protection device thus configured will be described. The input signal processing unit 7 inputs the plant state from the plant detector and transmits the plant state signal to the arithmetic processing unit 8 via the I / O bus. The arithmetic processing unit 8 inputs a plant state signal, performs control arithmetic according to a control program created in advance, and generates an automatic control signal. Normally, the generated automatic control signal is transmitted to the output signal processing unit 9 via the I / O bus and output to the actuator. The operator monitors the plant state displayed on the terminal of the manual operation unit 10, and when a manual operation is required, inputs a manual operation signal from the manual operation unit 10, and the manual operation signal is transmitted through the operation information transmission bus. It is transmitted to the arithmetic processing unit 8 via the. When the manual operation signal is input from the manual operation unit 10, the arithmetic processing unit 8 outputs the manual operation signal to the output signal processing unit 9.

When an abnormality occurs in the arithmetic processing unit 8, no signal is output from the arithmetic processing unit 8 to the output signal processing unit 9. Therefore, the manual operation signal input by the operator from the manual operation unit 10 is input. , Is transmitted from the manual operation unit 10 via the I / O bus directly connected to the output signal processing unit 9. As described above, even during the automatic control, when the manual operation is required, the control signal by the manual operation can be automatically output instead of the automatic control signal, and the monitoring and the control can be efficiently performed. Further, a manual operation signal can be secured even when the arithmetic processing unit is abnormal, and a highly reliable control protection device can be obtained.

Example 2. In addition, in the above-mentioned Example 1,
When an abnormality occurs in the arithmetic processing unit 8, the manual operation unit 10
Although the manual operation signal is directly transmitted to the output signal processing unit 9 for backup, the second embodiment describes an automatic backup process.
FIG. 2 is a block diagram showing a part of the control protection device according to the second embodiment, and 8 to 10 are the same as those in FIG. Also,
Although not shown, the plant state signal is input to the arithmetic processing unit 8 from the input signal processing unit 7 as in the first embodiment. Into the output signal processing unit 9, an I / O bus repeater (A) 11 as a first input unit for inputting a manual operation signal from the manual operation unit 10 and a control signal from the arithmetic processing unit 8 are input. An I / O bus repeater (B) 12 as a second input section is provided, and a selection logic 13 is provided for each of them.
And the selection logic 14 are associated. An output circuit 15 outputs a control signal to the plant based on the selected I / O bus signal.

Next, the operation will be described. Normally, the arithmetic processing unit 8 performs control arithmetic according to the control program based on the input plant state signal and outputs an automatic control signal. When manual operation is required, the manual operation unit 10
The control signal is output based on the manual operation signal input from. The control signals from these arithmetic processing units 8 are input to the I / O bus repeater (B) 12 in the output signal processing unit 9 via the I / O bus. The I / O bus repeater (B) 12 has a function of electrically insulating the multiplex transmission signal of the I / O bus and then generating the same signal again.
Further, when the multiplex transmission signal of the I / O bus is not regularly transmitted, it has a function of stopping the regeneration of the I / O bus signal and blocking the multiplex transmission signal. On the other hand, the manual operation unit 10 is directly connected to the I / O bus repeater (A) 11 in the output signal processing unit 9, and when an abnormality occurs in the arithmetic processing unit 8, the control signal is transmitted through this transmission line. Secure. The I / O bus repeater (A) 11 is also the I / O described above.
It has the same function as the bus repeater (B) 12.

The selection logics 13 and 14 associated with the respective I / O bus repeaters constantly monitor the respective I / O bus repeaters with each other, so that the transmission signals of the I / O bus are not transmitted periodically. If there is an I / O bus repeater that blocks signal input, select the signal of the I / O bus repeater that is not that I / O bus repeater,
Connect to the output circuit 15. Further, in the state where the signal is regularly transmitted to either of the I / O bus repeaters, the manual operation signal from the manual operation unit 10 input to the I / O bus repeater (A) 11 is given priority. Select and connect to the output circuit 15. As described above, a manual operation signal from the manual operation unit 10 can be automatically selected when the arithmetic processing unit 8 is abnormal, and a highly reliable control protection device can be obtained.

Example 3. In the second embodiment described above, an I / O bus repeater for inputting a signal from the arithmetic processing unit 8 and an I / O bus repeater for inputting a signal from the manual operation unit 10 are provided, and one of both signals is provided. However, if the state signal of the arithmetic processing unit 8 is input and the signal is selected by this, the device can be simplified and an inexpensive control protection device can be obtained. In FIG. 3, 16 is a diagnostic result signal indicating the state of the arithmetic processing unit 8, 1
7 is an arithmetic processing unit 8 based on the input diagnostic result signal.
The selected I / O bus is connected to the subsequent I / O bus repeater 18 by the selection logic that selects either the signal from the I / O bus or the signal from the manual operation unit 10.

In the control protection device configured as described above, the selection logic 17 connects the I / O bus connected to the arithmetic processing unit 8 to the I / O bus when the diagnosis result signal 16 from the arithmetic processing unit 8 is normal. By connecting to the / O bus repeater 18, the control signal from the arithmetic processing unit 8 is output to the output circuit 15. On the other hand, when the diagnostic result signal 16 is abnormal, the I / O bus connected to the manual operation unit 10 is connected to the I / O bus repeater 18, so that the manual operation signal from the manual operation unit 10 is output from the output circuit 15. Is output to. As described above, the backup operation can be performed with a simple device.

Example 4. Further, in the first to third embodiments, one input signal processing unit 7 is provided with one arithmetic processing unit 8 and backup operation is performed from the manual operation unit 10, but one input signal processing unit 7 is provided. On the other hand, the arithmetic processing unit 8
It is possible to obtain a highly reliable control protection device by multiplexing. In this case, as shown in FIG. 4, the arithmetic processing units 8 for inputting the plant state signals from one input signal processing unit 7 are multiplexed (triple in the example of the figure), and I and I are assigned to the respective arithmetic processing units. Connect the / O bus repeater.
The selection logic associated with each I / O bus repeater constantly monitors each other, and the I / O that does not periodically input a control signal
If there is an O bus repeater, a different I / O bus repeater signal is selected in a preset priority order and connected to the output circuit 15. As described above, it is possible to easily construct the control protection device that realizes the required reliability.

[0028]

Since the present invention is constructed as described above, it has the following effects.

Since the manual control signal from the manual operation means is transmitted to the arithmetic processing means through the transmission line,
Even during the automatic control, when the manual operation is required, the control signal by the manual operation can be automatically output instead of the automatic control signal, and the monitoring and control can be efficiently performed.

Further, since the manual operation means is directly connected to the output signal processing means by the transmission line, the manual operation signal can be secured even when the arithmetic processing means is abnormal, and a highly reliable control protection device can be obtained.

Further, since the control signal from the arithmetic processing means and the manual operation signal from the manual operating means are constantly monitored and one of them can be selected, the manual operation is automatically performed even when the arithmetic processing means is abnormal. The signal can be output to the plant.

Since the manual operation signal from the manual operation means is selected with priority over the control signal from the arithmetic processing means, when the arithmetic processing means becomes abnormal and the automatic control signal is not output, Manual operation signals can be selected and output to the plant.

Since the control signal is selected based on the signal indicating the state of the arithmetic processing means, a highly reliable device can be obtained with a simple device.

By providing a plurality of arithmetic processing means for one input signal processing means and multiplexing the arithmetic processing means, it is possible to construct a system according to the required reliability.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a control protection device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a part of a control protection device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a part of a control protection device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a part of a control protection device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a conventional control protection device.

[Explanation of symbols]

7 input signal processing unit, 8 arithmetic processing unit, 9 output signal processing unit, 10 manual operation unit, 11, 12, 18 I / O bus repeater, 13, 14, 17 selection logic, 16
Diagnostic result signal.

Claims (6)

[Claims] 1. The state of a plant such as power generation, steel, etc.
Input signal processing means for inputting a voltage value or the like and converting it into a plant state signal, operation processing means for inputting the converted plant state signal via a transmission line, performing control operation, and generating a control signal, and In a control protection device equipped with an output signal processing means for inputting a control signal via a transmission line and outputting it to a plant, a manual operation means for inputting a manual operation signal by an operator's manual operation is provided, and this manual operation means Is connected to the arithmetic processing means by a transmission line, and when manual operation is required, the arithmetic processing means inputs the manual operation signal and outputs a control signal thereby to the output signal processing means. Control protection device. 2. The manual operation means is connected to the output signal processing means by a transmission line, and when the function of the arithmetic processing means is lost, the manual operation signal from the manual operation means is directly transmitted to the output signal processing means to the plant. The control protection device according to claim 1, wherein a control signal is output. 3. The first output signal processing means inputs a manual operation signal from the manual operation means directly through a transmission line.
Second input section for inputting a control signal from the arithmetic processing means
And an input section for selecting the manual operation signal input to the first input section and a control signal input to the second input section. The control protection device according to claim 2. 4. The selection logic preferentially selects a signal input to the first input unit among signals input to the first input unit and the second input unit. The control protection device according to claim 3. 5. The output signal processing means inputs a state signal indicating the state of the arithmetic processing means from the arithmetic processing means, and when the arithmetic processing means is normal, the control signal from the arithmetic processing means is used for the arithmetic operation. The control protection device according to claim 2, further comprising a selection logic for selecting a manual operation signal when the processing means is abnormal. 6. A plurality of arithmetic processing means is provided for one input signal processing means, and a plurality of input parts for inputting control signals from the respective arithmetic processing means in the output signal processing means, and input. 2. The control protection device according to claim 1, further comprising a selection logic for selecting one from a plurality of control signals.