JP2006039648A - Plant monitor control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plant monitor control system having a guidance system for preparing a guidance database related with operations for realizing guidance by patterning, storing and learning the history of operations by human being, and for improving efficiency by shortening the operations. <P>SOLUTION: An operation history such as various commands or confirmation when any abnormality is generated and abnormality data are stored in a guidance database 109, and learnt as necessary, and outputted as guidance data corresponding to abnormality of the same kind, and guidance is realized by a man-machine interface 104 under a guidance control means 106. Thus, it is possible to acquire guidance based on the actual abnormality response operations, and to prevent the generation of the omission of any confirmation item, and to easily prepare a valid guidance database, and to improve operation efficiency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plant monitoring control system having a guidance function when an abnormality occurs.

  In general, in the monitoring and control system for various plants, a guidance system is provided that provides guidance to the supervisor about what countermeasures should be taken when an abnormality occurs. Various proposals for such guidance systems are provided. (For example, see Patent Documents 1 to 5).

  This type of conventional alarm guidance device registers guidance for predictable conditions such as messages, response procedures, and related alerts in advance in the guidance rule definition unit, so that response procedure display, priority display, recovery simulation, etc. I was doing. In addition, as a learning type system, an arithmetic method for obtaining a process value history and improving accuracy of a predicted value is used.

  Such an alarm guidance device needs to register guidance rules, response procedures, and messages in a database in advance. In addition, both registration knowledge and knowledge regarding plant operation are required for registration. For this reason, it has been an issue to facilitate a database creation method that can sufficiently exhibit the guidance function.

  Further, in the learning type system, it is possible to improve the accuracy of the predicted value by using the process value fluctuation history, but the prediction is a numerical value, and the guidance learning corresponding to the operation procedure has not been realized.

In addition, it is possible to use a macro function used in general software, but this macro function simply records an operation, edits it, and simply reproduces it, and its use is limited. .
JP 2002-108444 A JP 2000-172319 A Japanese Unexamined Patent Publication No. 6-309584 JP 2003-140746 A JP-A-6-348879

  Thus, the conventional alarm guidance device has to register guidance for predictable conditions in advance, and registration requires both knowledge about database creation and knowledge about plant operation. The burden on the operator was great. Further, in the learning type system, the guidance learning corresponding to the operation procedure cannot be realized.

  The purpose of the present invention is to create a guidance database for operations, perform guidance, and shorten operations by patterning and storing and learning the history of operations by humans, improving efficiency. Another object of the present invention is to provide a plant monitoring and control system having a guidance system that can be used.

  The plant monitoring control system of the present invention has a process controller that inputs various process values from a plant and outputs a control signal from the plant control device to the plant, and can operate various commands to the plant control device. A plant monitoring and control system having a man-machine interface capable of displaying the plant state grasped by the plant control device via the process controller via a display control means, and various types of inputs inputted by the process controller Stores process values and stores a process value database having reference values for determining abnormalities for these process values and various commands and confirmation operations to the plant via the man-machine interface via the guidance control means and stores them as an operation history. Operation If the process value input to the history database and the process value database is compared with the reference value and determined to be abnormal, the operation history before and after the occurrence of the abnormality is read from the operation history database, and the abnormal state and operation history are read. And a guidance database creation means for storing in a guidance database, and items to be acquired as a guidance pattern of the plant, and item-specific judgment indexes in which criteria for state judgment for each item are preset as indicators. The display control means displays an abnormal state on the man-machine interface when the process value input to the process value database is abnormal, and the guidance control means performs the command and confirmation operation by the man-machine interface in the operation history. When it is stored in the database When the man-machine interface displays an abnormal state, the item-specific determination index is referred to, and the type of abnormality corresponds to the item set in the item-specific determination index, and the state is used for the state determination. Data that falls within the standard is extracted from the guidance database and output to the display control means as guidance data.

  In the present invention, the guidance database creation means obtains from the operation history database as the data acquired from the process value database, including the screen opened for confirmation when the abnormality occurs and the corresponding operation history data. In addition, other process data related to the generated abnormality is included, and these are registered in the guidance database as guidance data for the generated abnormality.

  Further, in the present invention, the guidance control means sets in advance data whose abnormality type corresponds to the item set in the item-specific determination index and whose state falls within the state determination criterion. It may have a learning function for outputting this as guidance data when there are more than a few.

  The guidance control means may have a function of generating an automatic processing icon for automatically executing the subsequent operation when the guidance data is output by the learning function.

  In the present invention, when it is determined that the process value input to the process value database has approached an abnormality, the guidance database creation means reads the operation history before and after the operation value from the operation history database, and prevents the occurrence of the abnormality. The guidance data may be stored in the guidance database.

  In the present invention, the plant process is displayed along with the process value of each part on the display screen of the man-machine interface, and the guidance control means performs the instruction operation for the displayed process value as confirmation operation data together with the instructed numerical value. The operation history database may be acquired.

  In the present invention, each process value of the plant process is displayed as a trend graph on the display screen of the man-machine interface, and the guidance control means confirms the instruction operation for the displayed trend graph together with the indicated graph value. It may be acquired in the operation history database as operation data.

  Furthermore, in the present invention, when the data displayed on the display screen is instructed, the display form of the instructed part may be changed with respect to other parts.

  According to the present invention, the operation history such as various commands and confirmation at the time of occurrence of an abnormality is accumulated in the guidance database together with the abnormality data, and after learning as necessary, it is output as guidance data for the same type of abnormality. Guidance based on time-sensitive operation can be obtained, no check items are lost, and an effective guidance database can be easily created, and operation efficiency is improved.

  Hereinafter, an embodiment of a plant monitoring control system according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows the overall configuration of the plant monitoring control system in this embodiment. In FIG. 1, reference numeral 101 denotes a plant to be monitored and controlled, which will be described as a water supply facility having a distribution reservoir, a distribution pump, and the like.

  Next, the system side that monitors and controls the plant 101 will be described. The process controller 102 inputs and outputs various process values with the plant 101. The plant control apparatus 103 has a predetermined control program for the plant 101, receives various commands based on the process values input to the process controller 102 and the operation of the man-machine interface 104, and sends predetermined control signals via the process controller 102. Output to the plant 101.

  The man-machine interface 104 has a display function and a signal input function, displays the state of the plant 101, and performs various commands and confirmation operations for the plant. Specifically, the monitor screen, a mouse, a keyboard, a touch panel display, and a mobile terminal may be configured in whole or in part. The display control means 105 controls the display function of the man-machine interface 104, and functions to cause the man-machine interface 104 to display a display based on the control program of the plant control apparatus 103, for example.

  With these configurations, the process controller 102 inputs various process values from the plant 101 and outputs a control signal from the plant control device 103 to the plant 101. The man-machine interface 104 is capable of operating various commands to the plant control apparatus 103 and displays the plant state grasped by the plant control apparatus 103 via the process controller 102 via the display control means 105. can do.

  A process value database 107 stores various process values (for example, pond water level, flow rate, pressure, etc.) input and output by the process controller 102 from the plant 101, and has a reference value for determining an abnormality with respect to these process values. .

  A guidance control unit 106 controls various types of guidance when an abnormality occurs. As one of its functions, various commands and confirmation operations to the plant 101 by the man-machine interface 104 are accumulated in the operation history database 108 as needed as an operation history.

  111 is a guidance database creation means, which compares the process value input to the process value database 107 with its reference value, and when it is determined to be abnormal, reads the operation history before and after the occurrence of the abnormality from the operation history database 108, The read operation history is stored in the guidance database 109 in combination with the abnormal state.

  110 is an item-specific determination index, and items to be acquired as a guidance pattern of the plant 101 and a state determination reference for each item are set in advance as indexes. In this embodiment, since the plant 101 is a water supply facility, for example, “No. 1 distribution reservoir water level” is set as an item, and the state of the item (for example, water level “high” “medium” “low”) is determined. Are set as indicators (“high” for Xm or more, “medium” for X to Ym, “low” for Ym or less, etc.). These are set for each item of the plant.

  That is, for each process value and monitoring item, the type of judgment and judgment criteria that can be judged from the item are defined in advance. The above definition example was the water level, but as another specific definition example, if it is a status display, it is `` run '', `` stop '', `` failure '' or `` automatic '', `` manual '', if it is a water level, in addition to the above, `` abnormal '' For items requiring high accuracy, “high”, “high”, “medium”, “low”, “abnormally low”, “large”, “normal”, “small”, “zero” if the flow rate is required, more detailed definitions are made. In addition, in the case of a trend graph, the type of judgment regarding what kind of judgment can be considered for each display item, such as “increase”, “stable”, “decrease”, and what value should be judged as high? Such criteria are created according to the characteristics of each plant. This item-specific judgment index 110 can be created only with knowledge about plant operation without knowledge of the database.

  The display control means 105 has a function of causing the man-machine interface to display on the man-machine interface 104 that the process value is abnormal when the process value input to the process value database 107 is abnormal.

  Further, the guidance control means 106 stores the command and confirmation operation by the man-machine interface 104 in the operation history database 104 as in the previous operation, and when the man-machine interface 104 displays an abnormal state, the item-specific judgment is performed. Reference is made to the index 106. Then, it is determined whether or not the type of abnormality corresponds to an item set in the item-specific determination index 110, and whether or not the state falls within the state determination criterion. If the corresponding data exists in the guidance database 109, the data is extracted and output to the display control means 105 as guidance data.

  The display control unit 105 also has a function of causing the man-machine interface to display the data extracted from the guidance database 109 by the guidance control unit on the man-machine interface 104 as guidance data.

  When the process value input to the process value database 107 is determined to be abnormal, the guidance database creation unit 111 refers to the item-specific determination index 106 to determine which item and in what state the process value is. May be combined with the operation history before and after the occurrence of the abnormality and stored in the guidance database 109.

  Here, the data acquired by the guidance database creating unit 111 from the operation history database 108 includes screen data opened for confirmation and corresponding operation history data in the man-machine interface 104 when an abnormality occurs. The data acquired from the process value database 107 includes abnormal process data and other process data related to the generated abnormality. These are registered in the guidance database 109 as guidance data for the abnormality that has occurred.

  Next, the operation will be described with reference to the flowchart of FIG. First, in the stage of operation preparation (201), various items and their determination indexes are registered as data, and item-specific determination indexes 110 are created (204). Next, registration of basic guidance items that do not require new data acquisition (205) is performed by the same method as before, and the operation is started (202).

  In this operation stage, the trigger for guidance registration is assumed to be abnormal. That is, when an abnormality occurs in the plant 101 (206), the plant control apparatus 103 detects this and displays the abnormality occurrence on the man-machine interface 104 via the display control means 105. At this time, since an abnormal process value is input, the process value input to the process value database 107 is compared with a reference value, and an abnormal state is grasped by both the display control unit 105 and the guidance database creation unit 111.

  When the guidance control unit 106 obtains information on the occurrence of an abnormality via the process value database 107, the guidance database creation unit 111, and the guidance database 109, the guidance control unit 106 refers to the item-specific determination index 110 and corresponds to which item the generated abnormal state corresponds to. And it is judged whether it corresponds to the set state judgment standard (207). Then, it is determined whether the data corresponding to the item and state determination criteria exists in the guidance database 109, that is, whether the data has occurred before and is registered as a guidance pattern (208).

  If it is registered as a guidance pattern (208: Yes), this data is read out, output to the display control means 105 as guidance data for this abnormal state, and is guided by the man-machine interface 104 (209).

  At this time, the guidance control means 106 stores the operation history before and after the occurrence of the abnormality, that is, the history including the state of the item confirmed by the operator due to the occurrence of the abnormality in the operation history database 108 (210). This process is executed regardless of whether or not it is registered as a guidance pattern as described above (208: No).

  On the other hand, when an abnormal state occurs, the database creation unit 111 acquires operation history before and after the abnormal state from the operation history database 108, along with the process value related to the abnormal state acquired from the process value database 107, and guidance for the generated abnormality. The data is stored as data in the guidance database 109 to prepare for the subsequent occurrence of the same type of abnormality.

  Here, in order to determine whether or not a guidance pattern is registered in the guidance database 109, the item-specific determination index 110 is referred to for the following reason. That is, the data registered in the guidance database 109 is composed of process values of abnormal states that have occurred previously as described above. For this reason, when the process value is used as it is as a criterion for determining the guidance pattern, the probability that the same process value is generated hardly occurs, and thus the same guidance pattern cannot be captured.

  For example, when the distribution reservoir water level at the time of occurrence of abnormality is X1m (hereinafter referred to as 10.53 m) belonging to “high”, when the process value of 10.53 m is used as it is, a process that matches this 10.53 m The probability that there is a guidance pattern having the value 10.53m is very low. On the other hand, in the item-specific judgment index, as described above, the item such as “No. 1 reservoir water level” and the state of the item (for example, water level “high” “medium” “low”) are used for judgment. The standard (Xm (here 8m) or more is "high", X to Ym (here 4m or more and less than 8m) is "medium", and less than Ym (here 4m) is "low") The same guidance pattern can be easily captured.

  That is, for example, if the water level is 8 m or higher, it can be judged as “high” for both 10.53 m and 12.73 m. Therefore, even if the process value is used as it is as guidance data, the process value is compared with the judgment standard. By doing so, it is possible to immediately determine which state corresponds, and it is possible to easily grasp the corresponding guidance pattern.

  Of course, as shown in FIG. 1, when the guidance data is created by the guidance data creation unit 111, the process value is set to the water level “high”, “medium”, or “low” with reference to the item-specific judgment index 110. May be registered in the guidance database 109 according to the status. In this way, the guidance control means 106 can easily grasp the presence or absence of the same guidance pattern.

  The guidance control means 106 may have a learning function, and when a predetermined number of similar guidance patterns are registered abnormally, the patterns may be output as guidance data. For example, depending on the content of an abnormality, if the guide data based on a single operation history is output as it is, there may be a problem in terms of reliability. In such a case, by the learning function, the type of abnormality corresponds to the item set in the item-specific determination index, and the state corresponds to the state determination criteria, that is, the same type If there are more than a predetermined number of guidance patterns, these may be output as guidance data.

  Further, the guidance control means 106 may be configured to generate an automatic processing icon for automatically executing the subsequent operation when the guidance data is output by the learning function described above.

  The guidance database creation unit 111 has been described as creating guidance data when the process value input to the process value database 107 is abnormal. For example, when it is determined that the process value is approaching abnormal, The previous and subsequent operation histories may be read from the operation history database 108 and registered in the guidance database 109 as guidance data for preventive measures against occurrence of abnormality.

  Next, the confirmation operation in the man-machine interface 104 will be described. On the display screen of the man-machine interface 104, the plant process is displayed together with the process value of each part. The guidance control unit 106 can cause the operation history database 108 to acquire an instruction operation for the displayed process value as confirmation operation data together with the instructed numerical value.

  For example, a case where a touch panel display is used as an example of the man-machine interface 104 is shown in FIG. FIG. 3 shows tanks 315 and 325 that represent waterworks and are connected by a water channel. For example, “full” or “empty” status displays 316 and 326 are displayed for these tanks. Further, it is assumed that the process values 311 and 321 of the flow rate, the process values 313 and 323 of the water temperature, and the process values 314 and 324 of the water level are respectively displayed as numerical values.

  The state of FIG. 3 is an example of a screen confirmed by the operator after the alarm is generated, and the confirmed item 314 is displayed in large characters to be distinguished from other displays by pointing and confirming the confirmed item. . For example, when the flow rate value 321 to the downstream tank 325 is significantly lowered and an alarm is generated, the operator confirms the water level 314 of the upstream tank. Then, by this confirmation operation, it is recorded in the operation history database 108 that the confirmed item is the water level 314 of the upstream tank. Record any other screens that have been confirmed. This operation history data is created as an operation guidance to be confirmed when a similar alarm occurs later.

  That is, the guidance database creation unit 111 uses the data acquired from the operation history database 108 or the process value database 107 as the operation performed for the alarm occurrence, as to which of the confirmed item 314 and the confirmed item is the item-specific determination index 110. The screen opened to confirm whether or not, and the status of the other process value related to the item-specific judgment index 110 at the time of alarm occurrence, the alarm that occurred at the same time, the type of alarm, and the operation procedure Guidance data is created and registered in the guidance database 109.

  Here, as other related process values, know-how is required to register the relationship of which process value is related to which other process value. In general water treatment, the process value indicating the state of the inflow side and the state of the outflow destination is related, and if the state where the abnormality occurred is also abnormal, it can be considered that the destination is also related. Is normal. Also, in a simple plant, a group and system are grouped together to have a relationship, automatically registered in the guidance database 109, and later unrelated process values are deleted and messages are added using conventional methods. You can also edit the database.

  Further, each process value of the plant process can be displayed as a trend graph on the display screen of the man-machine interface 104. For this reason, the guidance control unit 106 causes the operation history database to acquire an instruction operation for the displayed trend graph as confirmation operation data together with the indicated graph value.

  FIG. 4 is an example of acquiring a confirmation item from a trend graph (process value history). In the confirmation item in the graph, the confirmation item can be specified as pointing confirmation by surrounding the confirmed part with a man-machine interface. The example in the figure shows a trend in which a certain value suddenly decreases when an operation is performed due to some phenomenon, and in this case, a portion where the value rapidly decreases is confirmed. In other words, for a certain phenomenon, guidance is generated that this sharply decreased value should be confirmed. For this purpose, the tendency of the confirmed item is increased, decreased, stable, maximum point, minimum point, etc., and the time difference between the time when the alarm occurs and the display range of the time axis 401 and the numerical axis 402 Guidance data is created by acquiring and recording.

  In addition, as a confirmation operation, it is possible not only to enclose but also to obtain a confirmation item by tracing. That is, as the confirmation operation, the part to be confirmed may be traced, enclosed, pointed, clicked, or the mouse is moved to the confirmed item and a specific button is pressed, or may be combined.

  The example of the operation on the terminal has been described above. However, manual operation such as valve opening / closing operation and on-site confirmation items are recorded using a portable terminal as a part of the man-machine interface 104, and the portable terminal and man-machine are recorded. Guidance can be given to both interfaces.

  In plant operation, there is often a case where a certain operation is performed instead of a simple procedure, and the next operation is performed after the process value reaches a certain value. As an operation history acquisition method in this case, as shown in FIG. 5, it is possible to record that a certain value has been reached by tracing a portion corresponding to a certain fixed value as indicated by a line 504. . Such an operation can also be recorded and guided as a confirmation operation for obtaining a constant value corresponding to a certain operation.

  When acquiring the confirmed item from the man-machine interface 104, the thickness of the confirmation part is changed, italicized, shaded, changed in color, the size is changed so that the operator can recognize the confirmed item. Change, blink, change line type, or a combination. In this way, the confirmed item can be displayed separately from other items.

  That is, when an instruction operation is performed on data displayed on the display screen of the man-machine interface 104, the display form of the indicated operation part is changed with respect to other parts, thereby allowing the operator to recognize the item confirmed and operated. Can do.

  Guidance is performed based on the results of these confirmation operations. As described above, the guidance control unit 106 determines whether the status at the time of alarm occurrence is a registered pattern, and enters the guidance mode. The determination of whether to enter the guidance mode is the same for the number of times that the alarm, the type of alarm, and other related process values match the contents of the item-specific determination index 110, and the number of times specified in the initial setting. When there is a history of confirmation operations, the mode is switched to the guidance mode.

  In the guidance mode, operation assistance such as changing the color and display of the confirmation item according to the confirmation procedure and displaying a shortcut to open another screen at the corner of the screen is performed. Even in the guidance mode, the operation history is accumulated. In addition, when the same confirmation and operation are performed more than the specified number of times, a button that can be specified to be automatically processed thereafter is provided to facilitate the operation.

  Thus, conventionally, only the registered guidance item can be displayed, but the guidance and procedure are shortened for the same situation and operation repeatedly performed, and the operation efficiency can be improved.

  In addition, since there is an effect of preventing missing confirmation items due to human error and misreading of numerical values, it is also possible to prevent an accident.

  In addition, when handing over to a new operator, it is possible to use it as a training material explaining why this item is confirmed and why this procedure is achieved, and a knowledge transfer effect can be obtained.

  In addition, since skilled engineers such as manufacturers often operate and witness until the initial delivery of the plant, knowledge of the skilled engineer including unsteady operations such as abnormal tests, test operations, and start / stop operations is required. There is also an effect that can be recorded from the initial stage.

  When there are a plurality of operation histories for a certain item as the guidance activation condition, the guidance with the larger number of operations in the new history is activated. Similarly, when there are a plurality of operation histories, if a new history has not been operated for another procedure for a specified number of times or more, guidance is activated based on the new history.

  Also, when performing the above guidance, change the thickness of the item to be confirmed, italic, shaded, change color, change size, blink, change line type, or combine Thus, items to be confirmed may be shown separately.

  Further, when performing the above guidance, the operation may be assisted by either a button that directly displays a screen to be confirmed, a shortcut, or a combination thereof.

  Further, when there are a plurality of operation histories to be guided when performing the guidance, a plurality of buttons for displaying the respective guidance may be provided and selectable.

  Furthermore, when performing the above guidance, if the corresponding conditions corresponding to the criteria for determining the guidance activation condition and the item to be confirmed match, the subsequent confirmation processing may be automatically performed.

It is a block diagram which shows one Embodiment of the plant monitoring control system by this invention. It is a flowchart explaining operation | movement of the guidance control means in embodiment same as the above. It is a simulation figure which shows the example of a display of the man machine interface in one Embodiment same as the above, and displays a plant structure with a process value. It is a display example of the man-machine interface in the same embodiment as the above, and is an explanatory diagram of a confirmation operation for a value of a trend graph. It is a figure which shows the example of a display of the man machine interface in one Embodiment same as the above, and demonstrates the confirmation operation of the instruction value with respect to a trend graph.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Plant 102 Process controller 103 Plant control apparatus 104 Man-machine interface 105 Display control means 106 Guidance control means 107 Process value database 108 Operation history database 109 Guidance database 110 Item-specific judgment index 111 Guidance database preparation means

Claims (8)

It has a process controller that inputs various process values from the plant and outputs a control signal from the plant control device to the plant, and can operate various commands to the plant control device, A plant monitoring and control system having a man-machine interface capable of displaying a plant state grasped by a plant control device via a display control means,
A process value database that stores various process values input by the process controller and has a reference value for abnormality determination for these process values;
An operation history database for inputting various commands and confirmation operations to the plant by the man-machine interface through the guidance control means and storing them as an operation history;
When the process value input to the process value database is compared with its reference value and determined to be abnormal, the operation history before and after the occurrence of the abnormality is read from the operation history database, and the abnormal state and the operation history are combined. A guidance database creation means to be stored in the guidance database;
The item to be acquired as the guidance pattern of the plant and a criterion for determining the state of each item, and an item-specific determination index set in advance as an index,
The display control means displays an abnormal state on the man-machine interface when the process value input to the process value database is abnormal,
The guidance control means stores the operation of command and confirmation by the man-machine interface in the operation history database, and refers to the item-specific judgment index when the man-machine interface displays an abnormal state. Extracting data from the guidance database that corresponds to the item set in the item-specific judgment index and whose state falls within the criteria for state judgment, and outputs the data to the display control means as guidance data. Plant monitoring and control system.   The data that the guidance database creation means acquires from the operation history database includes the screen that was opened for confirmation when an abnormality occurred and the corresponding operation history data, and abnormal process data that occurred as data to be acquired from the process value database The plant supervisory control system according to claim 1, wherein other process data relating to an abnormality is included and registered in the guidance database as guidance data for the abnormality that has occurred.   The guidance control means performs this when the abnormality type corresponds to the item set in the item-specific determination index, and there are more than a preset number of data whose state falls within the state determination criteria. The plant supervisory control system according to claim 1 or 2, further comprising a learning function for outputting the information as guidance data.   The plant monitoring control system according to claim 3, wherein the guidance control means has a function of generating an automatic processing icon for automatically executing the subsequent operation when the guidance data is output by the learning function. .   When it is determined that the process value input to the process value database is close to an abnormality, the guidance database creation means reads the operation history before and after the operation value from the operation history database, and uses the guidance database as guidance data for preventive measures against the occurrence of the abnormality. The plant monitoring control system according to claim 1, wherein the plant monitoring control system is stored in the plant monitoring control system.   On the display screen of the man-machine interface, the plant process is displayed together with the process value of each part, and the guidance control means causes the operation history database to acquire an instruction operation for the displayed process value as confirmation operation data together with the indicated numerical value. The plant supervisory control system according to claim 1 or 2, characterized by the above-mentioned.   Each process value of the plant process is displayed as a trend graph on the display screen of the man-machine interface, and the guidance control means performs an instruction operation on the displayed trend graph as an operation history database together with the indicated graph value as confirmation operation data. The plant monitoring control system according to claim 1, wherein the plant monitoring control system is acquired.   The plant monitoring control system according to claim 6 or 7, wherein when the data displayed on the display screen is instructed, the display form of the instructed part is changed with respect to other parts.

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