JPH06324899A - Triplex input processor - Google Patents

Abstract

PURPOSE:To provide a triplex input processor of both continuing automatic control even when abnormality occurs in two input among three input, and improving the availability factor of the automatic control of a plant. CONSTITUTION:This processor is comprised is such a way that a signal switcher 8, input eliminators 9A, 9B, and 9C, input selectors 10A, 10B, and 10C, an A- system input elimination selector 11, a B-system input elimination selector 12, a C-system input elimination selector 13, and a switching selector 14 are provided for a signal selection means M1. Also, an output selector 15 which computes the AND of the output of multiple input selector 5 and the NOT signal of an automatic control restoration signal S11 is provided with, and the switching of an output 6 can be controlled setting the output of the output selector 15 as an output switching signal S21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triple input processing device used for automatic control of a power plant or the like.

[0002]

2. Description of the Related Art Conventionally, in automatic control in a power plant or the like, even if three similar signals are input and an abnormality occurs in one of these signals, the automatic control is continued by the remaining two inputs. A triple input processing device capable of performing the above is used.

FIG. 3 shows such a conventional triple input processing apparatus.

A-system input signal S1, which is three input signals,
The B-system input signal S2 and the C-system input signal S3 are input to the signal selection unit M.
Input to 1.

In the signal selecting section M1, the intermediate value selector 1 selects the intermediate value of these input signals S1, S2 and S3 and outputs the selection signal S4. Then, the selection signal S4 is input to the control calculator 2, where a predetermined calculation is performed, and the control output signal S based on the selection signal S4.
5 is output, and the automatic control based on the control output signal S5 is executed.

On the other hand, each of the input signals S1, S2, S3 is input to each of the three input abnormality detecting sections M2 provided corresponding to them. Each input abnormality detection unit M2 is composed of a subtractor 3 and a large deviation detector 4, and the subtractor 3 obtains the deviation between each of the input signals S1, S2, S3 and the selection signal S4, and further, This deviation is input to the large deviation detector 4. When the deviation is large, the large deviation detector 4 outputs the respective abnormality detection signals of the A-system input abnormality signal S6, the B-system input abnormality signal S7, and the C-system input abnormality signal S8.
Is output.

These input abnormality signals S6, S7, S8
Is input to the multi-input selector 5, and the multi-input selector 5 turns on the output switching signal S21 when any two or more of the three input abnormality signals S6, S7, S8 are turned on. State, the contacts of the output signal switch 6 are switched, and the output signal S10 of the output signal switch 6 is changed.
Is switched from the control output signal S5 to the manual setting signal S9.

The operation of the triple input processing apparatus having the above configuration will be described more specifically below.

First, three inputs (input signals S1, S2, S
When all of 3) are normal, the normal signal is selected by the intermediate value selector 1, the selection signal S4 which is the output signal of the intermediate value selector 1 becomes normal, and the control signal is selected using the selection signal S4 as the process value. The control output signal S, which is the result of the calculation in 2
Since No. 5 becomes normal, normal automatic control is performed.

In this case, the input abnormal signals S6, S7, S
8 is all in the off state, and therefore, the multi-input selector 5 turns off the output switching signal S21, the output signal switching device 6 selects the control output signal S5 as the output signal S10, and outputs the control output signal S5. Based on this, automatic control is performed.

Next, when an abnormality is detected in one of the three inputs, for example, when an abnormality occurs in the A system input signal S1 and the A system input abnormality signal S6 is output, the B system input signal is output. Since the two inputs of S2 and C system input signal S3 are almost the same, whether the abnormal input> normal input or the abnormal input <normal input, the intermediate value selector 1 outputs the normal input B.
One of the system input signal S2 and the C system input signal S3 is selected, and the selection signal S4 and the control output signal S5 are normal, so that normal automatic control is performed.

In this case, the input abnormality signals S6, S7, S
Although one of the eight (input abnormal signal S6) is in the ON state, the output switching signal S21 of the multi-input selector 5
Remains in the off state, the output signal switch 6 selects the control output signal S5 as the output signal S10, and the automatic control based on the control output signal S5 is continued.

If any two of the three inputs are abnormal, the intermediate value of the three inputs is not always normal, and the intermediate value selector 1 cannot select a normal signal. There is a possibility. Therefore, automatic control cannot be continued.

In this case, the three input abnormality signals S6 and S
Since two of S7 and S8 are in the ON state, the multi-input selector 5 turns on the output switching signal S21, and the output signal switching unit 6 outputs the output signal S10 manually from the manual output setting unit 7. The setting signal S9 is selected.

[0015]

However, in the above-mentioned conventional triple input processing apparatus, when an error occurs in two of the three inputs, only manual control can be performed thereafter, and the remaining 1 Even if the input is normal, there was a problem that automatic control could not be continued.

The present invention has been made in response to such a conventional situation, and automatic control can be continued even when an abnormality occurs in two of the three inputs, and the operation rate of the automatic control of the plant can be improved. It is an object of the present invention to provide a triplex input processing device which can be improved.

[0017]

That is, a triple input processing apparatus according to claim 1 is a signal selecting means for selecting one input signal from three input signals and outputting it as a selection signal, and the signal selecting means. Control calculation means for executing a predetermined calculation based on a selection signal from the means to output a control output signal, input abnormality detection means for detecting abnormality of each of the three input signals, and the input abnormality detection means for detecting the abnormality. Three
A triple input processing device comprising switching means for switching the control output signal to a manual setting signal and switching from automatic control to manual control when two of the input signals are determined to be abnormal. Then, the switching means is configured to be able to return from the manual control to the automatic control by inputting a return signal, and the signal selection means,
When the input abnormality detection means determines that two of the three input signals are abnormal, the remaining one normal input signal is manually selected and can be input to the control calculation means. It is characterized by being configured.

The triple input processing apparatus according to claim 2 is 3
Signal selecting means for selecting one input signal from the two input signals and outputting a selection signal; and control calculating means for executing a predetermined calculation based on the selection signal from the signal selecting means and outputting a control output signal. , A triple input processing device comprising input abnormality detecting means for detecting abnormality of each of the three input signals, wherein the signal selecting means outputs an intermediate value when all of the three input signals are normal. If an input signal is selected and output as a selection signal, and if one of the three input signals is determined to be abnormal by the input abnormality detecting means, then the remaining two input signals are selected. It is characterized in that a high value or a low value is selected and output as a selection signal.

The triple input processing apparatus according to claim 3 is 3
Signal selecting means for selecting one input signal from the two input signals and outputting a selection signal; and control calculating means for executing a predetermined calculation based on the selection signal from the signal selecting means and outputting a control output signal. , A triple input processing apparatus comprising input abnormality detecting means for detecting abnormality of each of the three input signals, wherein the signal selecting means selects an input signal of an intermediate value among the three input signals. An intermediate value selection unit that selects and outputs as a selection signal, and an upper limit value that can be input to this input signal when one of the three input signals is determined to be abnormal by the input abnormality detection unit. Or an input switching unit for switching to the lower limit and inputting to the intermediate value selecting unit.

[0020]

In the triple input processing device of the present invention having the above structure,
Even if two of the three input signals become abnormal, by manually selecting one of the remaining normal input signals, or by selecting a high value or a low value depending on the characteristics of the plant, The automatic control can be safely continued.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a triple input processing apparatus according to an embodiment of the present invention. The parts corresponding to those of the conventional triple input processing apparatus shown in FIG. Therefore, duplicate description will be omitted.

In the triple input processing apparatus of this embodiment, the signal selector M1, the signal switcher 8, the input remover 9A,
9B and 9C, input selectors 10A, 10B and 10C, an A-system input exclusion selector 11, a B-system input exclusion selector 12, a C-system input exclusion selector 13, and a switching selector 14 are provided.

The signal switching unit 8 includes signal selecting means M.
The selection signal S4 which is the output of 1 is switched to the intermediate value selection signal S18 which is the output of the intermediate value selector 1 and the manual selection signal S19, and the input abnormality signals S6, S7 and S
When the switching signal S20 which is the output of the switching selector 14 for calculating the logical sum of 8 is in the off state, it is switched to the intermediate value selection signal S18 side, and when the switching signal S20 is in the on state, it is switched to the manual selection signal S19 side. ing.

Further, the A-system input exclusion selector 11 outputs the A-system input abnormality signal S6 and the B-system input exclusion selection signal which is the output of the B-system input exclusion selector 12 and the C-system input exclusion selector 13 of the other system. The negative signals of S13 and the C-system input exclusion selection signal S14 are input, and the logical product of these signals is calculated. When the A-system input exclusion selection signal S12, which is the output of the A-system input exclusion selector 11, is turned on, the input excluding device 9A operates to be in the open state, and the A-system input signal S1 is generated.
Are excluded. The input selector 10A is a system A input selection signal S
When 15 is turned on, it closes and the manual selection signal S19
Is configured to select the A system input signal S1. Other input removers 9B, 9C, input selectors 10B, 1
0C, B system input exclusion selector 12, C system input exclusion selector 1
3 is similarly configured.

Further, in the triple input processing apparatus of this embodiment, the output of the multi-input selector 5 and the automatic control return signal S11.
An output selector 15 for calculating a logical product of the output signal and the negative signal is provided. The output of the output selector 15 is used as an output switching signal S21 to control switching of the output switching device 6.

Next, the operation of the triple input processing apparatus having the above configuration will be described.

When all the input signals are normal as a result of the input abnormality detection by the input abnormality detection means M2, the signal selection means M
1, in the intermediate value selector 1, the three input signals S1,
The intermediate value between S2 and S3 is selected, and the intermediate value selection signal S18
Is output.

Further, the A-system input abnormality signal S6, the B-system input abnormality signal S7, and the C-system input abnormality signal S8 are all in the OFF state, and the switching selector 14 for calculating the logical sum of these three signals. The switching signal S20 which is the output is turned off, and the signal switching unit 8 selects the intermediate value selection signal S18 from the intermediate value selector 1 as the selection signal S4 which is the output of the signal selecting means M1.

Then, the control arithmetic unit 2 performs an arithmetic operation using the selection signal S4 as a process value, and outputs a control output signal S5. In addition, each input abnormality signal S6, S7,
Since all of S8 are in the off state, the output of the multi-input selector 5 is in the off state, and the output signal of the multi-input selector 5 and the automatic control return signal S11 which is on / off in the human system and is normally in the off state. The output switching signal S21, which is the output signal of the output selector 15 that calculates the logical product of the negative signals, is turned off. Therefore, the output switcher 6 selects the control output signal S5 as the output signal S10.

Next, when an abnormality is detected in any one of the three input signals S1, S2, S3, for example, an abnormality occurs in the A system input signal S1 and the A system input abnormality signal S6. Is output, the signal selection means M1 outputs A
In the A-system input exclusion selector 11, which calculates the logical product of the system-input abnormal signal S6, the negative signal of the B-system input exclusion selection signal S13, and the negative signal of the C-system input exclusion selection signal S14,
Since the A-system input abnormal signal S6 is turned on, the B-system input exclusion selection signal S13 and the C-system input exclusion selection signal S14 are off, and the respective negative signals are on, the A-system input exclusion selection which is an output signal. The signal S12 is turned on, the contact of the input remover 9A is opened, and the A system input signal S1 is excluded.

In this embodiment, the A-system input selection signal S
15 and the B-system input selection signal S16 are set to be normally ON. Therefore, the contacts of the B-system input selector 10B are closed, and the B-system input signal S2 is selected as the manual selection signal S19 from the remaining two normal inputs. Then, in the switching selector 14 that calculates the logical sum of the input abnormal signals S6, S7, and S8, the A system input abnormal signal S6 is turned on, so the switching signal S20 that is an output signal is turned on, and The switch 8 is switched to the manual selection signal S19 side, and the manual selection signal S19 is selected as the selection signal S4 which is the output signal of the signal selection unit M1.

Input selection signals S15, S16, S1
No. 7 is set so that two of them are always on, or one of the other two systems is generated in response to the occurrence of the input abnormality signals S6, S7, S8.

In this way, the selection signal S4 (manual selection signal S19) selected by the signal selection unit M1 is input to the control computing unit 2, and the computation is executed by using this selection signal S4 as a process value, and the control output The signal S5 is output.

Further, three input abnormality signals S6, S7, S
One of the eight is turned on, but the multi-input selector 5
Of the output selector signal S21, which is the output signal of the output selector 15, remains in the off state. Therefore, the output switcher 6 selects the control output signal S5 as the output signal S10 and continues the automatic control.

Next, a case where one of the remaining two inputs becomes abnormal and the input abnormality signal is turned on will be described.

For example, when the C-system input abnormality signal S8 is in the ON state, it is impossible to determine which input signal is abnormal because abnormality detection is based on the method of observing the deviation between the two signals. . In this case, since the A-system input abnormality signal S6 and the C-system input abnormality signal S8 are turned on, the output of the multi-input selector 5 is turned on and the negative signal of the automatic control return signal S11 is turned on. The signal S21 is turned on, and the output switching device 6 switches the output signal S10 from the control output signal S5 to the manual setting signal S9 from the manual setting device 7.

On the other hand, in the signal selecting section M1, the A system input exclusion signal S12 has already been turned on and the negation signal thereof has been turned off in both the B system input exclusion setting device 12 and the C system input exclusion setting device 13. Therefore, the B system input exclusion signal S13 and the C system input exclusion signal S14 remain off, the input removers 9B and 9C are not opened, and these systems are not excluded.

Here, the human system judges which of the B system input signal S2 and the C system input signal S3 is normal, and the system which is judged to be normal is turned on and the system judged to be abnormal. The input selection signal of is turned off. For example,
When it is determined that the C system input signal S3 is normal, C
The system input selection signal S17 is turned on and the B system input selection signal S16 is turned off. As a result, the B-system input selector 10B is opened, the C-system input selector 10C is closed, and the C-system input signal S3 determined to be normal is selected as the manual selection signal S19.

In the switching selector 14, A
Since the system input abnormality signal S6 and the C system input abnormality signal S8 are in the ON state, the switching signal S2 which is the output thereof.
0 continues to be in the ON state, and the signal switch 8 selects the manual selection signal S19 as the selection signal S4.

After that, by turning on the automatic control return signal S11, the negative signal of the automatic control return signal S11 input to the output selector 15 is turned off, and the output switching of the output selector 15 is switched. The signal S21 is turned off, and the output switch 6 is switched to the control output signal S5 side.

Thus, the C system input signal S judged to be normal
Since the control calculator 2 can perform the calculation with 3 as the process value and the control output signal S5 as the result can be used as the output signal S10, the automatic control can be continued.

Next, another embodiment will be described with reference to FIG.

In the following description, there are two possible methods for selecting the safe direction when one input is abnormal, namely, a method of selecting a high value of the remaining two inputs and a method of selecting a low value.
In this embodiment, a case of selecting a high price will be described.

There are several possible methods for switching from the intermediate value selection to the high value selection in the signal selection unit M1, but in the present embodiment, as shown in FIG. Input switches 16, 17, 18 and input selectors 19, 20, 21 for each system are arranged in each system on the input side of the intermediate value selector 1, and the input signal value in which the abnormality is detected is determined by these. Is switched to the input upper limit signal S22, which is the upper limit of the input, and the intermediate value selection is continued to use the method of making the function of the intermediate value selector 1 the high value selection by the remaining two inputs. .

In the triple input processing apparatus of this embodiment having the above-mentioned configuration, when all the three input signals S1, S2, S3 are normal, the A system input switch 16 of the signal selecting section M1 has three input signals. Among them, the A system input abnormal signal S6 is in the off state, the negative signal of the B system input switching signal S24 which is the output of the B system input switching device 17 is in the on state, and the B system input switching is the output of the C system input switching device 18. Signal S25
Is negative and the output signal of the A system input switching signal S23 is off.

In the B-system input switch 17 and the C-system input switch 18, since the B-system input abnormality signal S7 and the C-system input abnormality signal S8 are off, the B-system input which is an output signal. The switching signal S24 and the C system input switching signal S25 are turned off.

Therefore, the A-system input selector 19, the B-system input selector 20, and the C-system input selector 21 select the input signals S1, S2, S3 of each system, and the intermediate value selector 1 selects the input signal. Select an intermediate value of S1, S2 and S3 and select signal S4
Is output. Then, the control signal 2 is calculated by using the selection signal S4 as a process value, and the output signal S10 is output to execute the automatic control.

Next, when an abnormality occurs in any one of the three inputs, for example, when the A system input signal S1 becomes abnormal and the A system input abnormal signal S6 is in the ON state, the A system is detected. In the input switch 16, the A system input abnormal signal S
When 6 is turned on, all the inputs are turned on, and the output is the A-system input switching signal S23.
Turns on. As a result, the A system input selector 19
Is switched to the input upper limit signal S22.

Comparing the three inputs of the intermediate value selector 1 at this time, the A system input signal S1 becomes the input upper limit signal S22 and becomes maximum, and the B system input signal S2 and the C system input signal S3.
Are substantially equal to each other, the intermediate value selector 1 uses the remaining normal two B-system input signal S2 as the selection signal S4.
And C system input signal S3, whichever is higher. Then, the control arithmetic unit 2 performs an arithmetic operation using the selection signal S4 as a process value, and outputs the output signal S10 to continue the automatic control.

Further, when one of the remaining two inputs becomes abnormal and an input abnormality signal is generated, for example, when the B-system input abnormality signal S7 is turned on, the abnormality detection method is used. Since the deviation between the two signals is large,
In reality, it cannot be determined which input signal is abnormal.

In this case, in the B system input switch 17,
The B system input abnormality signal S7 is turned on, but the negative signal is the off state because the A system input switching signal S23 is on, and the B system input switching signal S24 is on.
Remains off, and the B-system input signal S2 is directly input to the intermediate value selector 1.

If the B system input signal S2 <C system input signal S3 is satisfied, the three inputs in this case are: A system input signal S1 = input upper limit signal S22> C system input signal S3> B system The input signal S2 is established, and the selection signal S4 from the intermediate value selector 1
, The C-system input signal S3 is selected. When this signal is used as a process value and controlled by the control calculator 2, normal control can be performed when the C-system input signal S3 is a normal input signal, and even if it is an abnormal input signal, the safe direction is selected. Is a high value choice, the plant to be controlled can be kept safe and automatic control can continue.

In most cases, the cause of the input abnormality is the input signals S1, S2, S3 of each system.
Is due to a disconnection failure of the signal input wire for inputting from the controlled object to the triple input processing device, and the input signal becomes zero at this time. In such a case, as described above, when an abnormality is detected in one input (A system input signal S1) among the three inputs, this input is used as the input upper limit signal S22, and one of the remaining two inputs (B system). By inputting the input signal that has become zero to the intermediate value selector 1 when an abnormality occurs in the input signal S2), the three input relationship is as follows: A system input signal S1 = input upper limit signal S22> C system input signal S3> B system input signal S2 = 0. Therefore, in this case, the selection signal S4 from the intermediate value selector 1 becomes the C system input signal S3 which is a normal input, and the automatic control can be normally continued.

When the input safe direction selection is the low value selection, the input upper limit signal S2 is used in the above-described embodiment.
If an input lower limit value signal that is a lower limit value that can be input is set instead of 2, automatic control can be continued as in the above-described embodiment.

[0056]

As described above, according to the triple input processing apparatus of the present invention, automatic control can be continued even when an abnormality occurs in two of the three inputs, and automatic control of the plant can be performed. It is possible to improve the operating rate of.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a triplex input processing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing the configuration of a triplex input processing apparatus according to another embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional triple input processing device.

[Explanation of symbols]

 M1 signal selection unit M2 input abnormality detection unit 1 intermediate value selector 2 control calculator 3 subtractor 4 deviation large detector 5 multiple input selector 6 output selector 7 manual output setter 8 signal selector 9A, 9B, 9C input Exclusion device 10A, 10B, 10C Input selector 11 A system input exclusion selector 12 B system input exclusion selector 13 C system input exclusion selector 14 Switching selector 15 Output selector

Claims (3)

[Claims] 1. A signal selection means for selecting one input signal from three input signals and outputting it as a selection signal, and a predetermined operation is executed based on the selection signal from said signal selection means to obtain a control output signal. Output control arithmetic means, input abnormality detecting means for detecting abnormality of each of the three input signals, and when two input signals of the three input signals are determined to be abnormal by the input abnormality detecting means, A triplex input processing device comprising switching means for switching the control output signal to a manual setting signal and switching from automatic control to manual control, wherein the switching means is switched from manual control by inputting a return signal. It is configured to be able to return to automatic control, and the signal selection unit determines that two input signals of the three input signals are abnormal by the input abnormality detection unit. If it, manually select the one remaining normal input signal, the input can be configured that triplicated input processing apparatus, wherein the control operation unit. 2. A signal selection means for selecting one input signal from three input signals and outputting a selection signal, and a predetermined operation based on the selection signal from the signal selection means to obtain a control output signal. A triple input processing device comprising: a control calculation means for outputting; and an input abnormality detecting means for detecting abnormality of each of the three input signals, wherein the signal selecting means has all of the three input signals normal. In this case, the intermediate value input signal is selected and output as a selection signal, and when one of the three input signals is determined to be abnormal by the input abnormality detection means, the remaining 2 A triplex input processing device, characterized in that a high value or a low value of two input signals is selected and output as a selection signal. 3. A signal selection means for selecting one input signal from three input signals and outputting a selection signal, and a predetermined operation based on the selection signal from the signal selection means to obtain a control output signal. A triple input processing device comprising: a control calculation means for outputting; and an input abnormality detection means for detecting abnormality of each of the three input signals, wherein the signal selection means is one of the three input signals. Intermediate value selecting means for selecting an intermediate value input signal and outputting it as a selection signal, and this input signal when one of the three input signals is determined to be abnormal by the input abnormality detecting means. An input switching device for switching to an upper limit value or a lower limit value that an input can take and for inputting to the intermediate value selection device.