JPS61256410A - Plant supervisory equipment - Google Patents

Abstract

PURPOSE:To give the information on the abnormality to an operator with high reliability by securing the matching between the abnormality detecting timing and the abnormality diagnosing timing of a plant and therefore eliminating the misdiagnosis due to the deviation between both timings. CONSTITUTION:The output signals given from detectors 3, 7 and 26 provided at a specified part 2 of a plant 1 are converted into voltage levels by a converter 5. These voltage levels are supplied to a limit checker 10 and MODEMs 27 and 31 of a computer 8. A plant diagnosis logic 9 is started by the signal of the checker 10 and a start instruction 12. When the generation of abnormality is supplied to a plant supervisory equipment from the plant 1, the time of the abnormality detecting timing can be set freely by an OFF-delay timer. Then the matching is secured between the abnormality detecting timing and the abnormality diagnosing timing of the plant 1 to eliminate the misdiagnosis due to the deviation between both timings. Thus the information of the abnormality id delivered with high reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a conventional plant monitoring device that monitors a conventional plant and outputs an appropriate message when an abnormality is detected.

[Conventional technology]

Conventionally, there has been a device as shown in FIG. 2 as this type of device. In Figure 2, 1 is a plant, 2 is a plant 1
8 is a device that has the characteristic that if it becomes abnormal, the influence will spread to other parts of the plant 1, and 8 is a certain abnormality that occurs in the device 2 (e.g. high temperature, low pressure, etc.) The detector outputs signal 4. A converter 6 converts the voltage level of the signal 4 and outputs the signal 6.・
, 7 is a detector that detects a process quantity that has some kind of causal relationship with the process quantity detected by the detector 8, and 8 is a computer that includes a plant diagnosis logic 9 configured by software and a display device (for example, a CRT) (not shown). ). , 10 is a limit check of a software configuration that inputs the signal 6 of the converter 6 and outputs it at a level p earlier than the normal alarm level of the plant 1, that is, on the safe side of the plant 1. Signal (binary signal)
Outputs 11. The goose is the activation command C signal of the plant diagnosis logic 9).

In the plant diagnosis logic 9, 18 is the limit
An observable point c that is detected as a warning in the plant diagnosis logic 9 when the signal 11 of the checker 10 is turned on (hereinafter referred to as a node), 14 is detected in the plant diagnosis logic 9 similarly to the node 18. 15 is an AND gate, 16 is an OR gate,
17 is the minimum time delay Cl6) of the time delay circle that occurs when reaching from the lower node 13) to the higher node 19)
, 18 is a message 19 which is outputted after node 18 is detected as a warning and it is determined that the cause is the node 14 IC, and an instruction to avoid spreading the abnormal state avoidance power 5. is the node ζ detected after the logical sum of time delay r@er4 from node 18, 2
0 is the node where the abnormality reaches and 0<final state, 21 is the point, and if it becomes abnormal, it will also affect the part of the detector 8, but if the detector is not detected or the detector is installed, 0 is the point. This is a virtual point. 22 is a low-altitude logic, which is provided corresponding to the unobservable point 21, and is a logic that simulates the route through which its influence spreads. ,
28 is a virtual node corresponding to point 21.

24 is point: / ト21. (The node 18 fζ is additionally provided to correspond to the 5E empty logic 22 and the node 28, and is a message instructing avoidance of an abnormal state.

2 is one component in the device 2FEi, 26
is a detector that detects an input signal to component 25;
2) is a model that simulates the component 26, that is, has characteristics equivalent to this, and 29 is a model with a predetermined margin value El and a model/
An adder that adds the outputs of the I/2 units outputs a signal 80 having a component dynamic limit value that dynamically defines a component failure. , 81 is a model that simulates the component 2, and Minoru is a model that simulates the component 26. The proverb is an adder that adds the margin till Ex to give the model/l/81 a margin, and the output of the model/l/81.
It outputs a system level dynamic limit value signal 85 that dynamically defines failures of levels 2 and up.

The next Cζ operation will be explained.

The signals output from the detectors 8 and 7 of the device R2 are converted by each corresponding converter 6 and input to the limit check IG of the computer 8. limit check 10
When the signal 11 is output, that is, when it turns on, the activation command 1 is activated.
2, the plant diagnostic logic S is activated, and No. 43 n is detected by the )-domain 18. It is known in advance that the abnormality in the detector 8 is caused by the influence from the detector 7 or others, and the range of its causal relationship is simulated by the AND gate 15 and the OR gate 16. Therefore, if an abnormality is detected before the plant diagnosis logic 9 is activated and the node 14 reaches the alarm level, the cause of the abnormality is a situation in which the node 14 is detected. That's true. Furthermore.

It is determined that the cause of the abnormality at the detection lI8 is an abnormality at the detector 7, and a message 18 is output to the operator in order to prevent this abnormality from spreading.

Further, when the node 18 is detected during plant diagnosis and the logic 9 is not activated, the logic above it is checked. As a result, the next possible state of the plant 1 can be predicted, and the operator can take precautionary measures to avoid reaching the final state of the node 20. In addition,
l1ilfζ of node 18 and node 19 is plant 1
The minimum possible time c8 is set at t;
Therefore, if node 19 is detected within a time shorter than time C8 after node 1a is detected, it is determined that there is a failure in detector 2 on the plant 1 side that detects node 19. .

In order to communicate these causes and future predictions to Unko staff,
This diagnostic logic 3 of the plant 1 is displayed on the display device in the format shown, and the abnormal state of the detector 3.7 and the message 1B are displayed on the displayed nodes 18 and 14, respectively.
additionally displayed. This allows the operator to
It is possible to accurately grasp the state of the abnormal state and perform operations to avoid the abnormal state. However, after an abnormality is detected at node 18, in order to investigate the cause of the abnormality, nodes below node 18 are investigated, but if no abnormality is detected in any node (Cause identification failure), It is determined that the cause of the abnormality is an abnormality at an unobservable point 21 in the plant 1 circle, that is, the node 2d is abnormal.

Note that this message consists of content stating that the cause of the abnormality is in a non-observation node, for example, node 28, and also includes instructions for operation in accordance with this. If the detector detects the output signal of the component 25, that is, if it is assumed that the cause of the abnormality is a failure of the component 25, the detector 26 detects the input signal to the component 26. , the output of the detector 26 is inputted via the converter 5 to a model /L'27 tζ having characteristics equivalent to those of the component 25. The output of the model A/27 is added to the margin value E1 by the adder 29, and the movement value of the component 25 matches 1.
A signal value 80 is obtained with a component dynamic limit dynamically defined in the form of a rectangle. From this Gζ, limit check 10 is for the plant! [Issuing accurate activation command 11 even at time 1ζ.] Also, for example, in the node 18, a model/L/
Margin value E for input of 81! By adding , a signal 86 is determined that dynamically defines a fault in the device 2 in a manner consistent with its movement. As a result, all nodes including the nodes 18 and 14 in the plant diagnosis logic 9 can provide appropriate information to the operator even during plant transitions, making it possible to avoid plant abnormalities.

[Zhao point that the invention is trying to solve]

Conventional plant monitoring equipment has the above configuration.8
The timing of detecting abnormalities at nodes 113 and 141 may be too early because the detection point (3) of the plant is not set at the appropriate timing or position to recognize the abnormality, and the effect is As a result, plant abnormalities are misdiagnosed and inaccurate abnormal situation avoidance operation messages are issued.

This invention was developed in order to eliminate the drawbacks of the above-mentioned conventional methods, and by providing a time delay in the abnormality detection input from the plant and freely changing the setting time, it is possible to detect the optimum abnormality. The object of the present invention is to provide a plant monitoring device capable of outputting highly reliable messages without erroneously diagnosing plant abnormalities by performing detection and transmitting the information to the plant diagnosis logic.

[Means to resolve the gap]

The plant monitoring device according to the present invention is equipped with an abnormality detection timing adjustment IT that can set the time delay n of abnormality detection input from the plant.

[Effect]

The plant monitoring device according to the present invention eliminates misdiagnosis of plant abnormalities by freely changing the setting time of the time delay of the abnormality detection timing device.

[Actual example of invention]

Hereinafter, a drawing example of the present invention will be explained with reference to the drawings. 1st
In the figure, 1 to 85 represent the same parts as in Figure 2.
6 represents a logical time delay element that can freely change the set time, that is, an on-delay timer (or off-delay timer).

Next, the operation will be explained. Since the operation from 1st to 81st st is the same as that of the conventional plant monitoring device, repeated explanation will be omitted below. A logical on-delay timer C or off-delay timer 11, whose settings can be freely changed, is provided for the output from the limit check o-groan to match the abnormality detection input of the plant with the ON time of node la, 14 in the plant diagnosis logic. This can be done freely depending on the setting, and plant abnormalities are accurately communicated to the plant diagnosis logic 9 to perform plant monitoring to avoid erroneous diagnosis.

□Although this invention was realized with S/W, it can also be realized with a hard-wired one.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to match the timing of detecting a plant abnormality with the timing of diagnosing a plant abnormality. This eliminates the possibility of erroneous diagnosis due to timing discrepancies, and provides highly reliable information regarding plant abnormalities. This has the effect of providing information to operators.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a plant monitoring device of the present invention, and FIG. 2 is a block diagram showing a conventional plant monitoring device. 1...Plant, 8,7.26...Detector, 5...
・Converter, 8... Computer, 9... Plant diagnostic logic, 10... Limit check, 18.1
4.19.20°28... Node, 15... AND gate, 16... OR gate, 21... Point, 22... Temporary logic, 28... Temporary node, 25... component, 27. ai, 82・
...Model, 29.84...Adder, 86...Off-delay timer (or on-delay timer) u
Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] When the output of a detector that detects the process amount input to a specific part of the plant indicates a second abnormality level that is set to be safer than a predetermined first abnormality level, the output of the detector is transmitted to the plant. In a plant monitoring device that performs the above diagnosis as an input condition for a logical decision tree for diagnosis, there is a model that has a response characteristic that simulates the above specific part and that introduces the output of the above detector, and a model that incorporates the output of this model. An adder that adds a predetermined margin value, a limit check that detects the second abnormality level based on the output of the adder and a status signal detected from the specific portion, and an abnormality occurrence detection timing adjustment device. A plant monitoring device characterized by: