JPH0876831A - Interlock display device/method - Google Patents

Abstract

PURPOSE: To provide an interlock display device/method which can display and easily grasp the operating state of a plant interlock. CONSTITUTION: The interlock display device/method includes a data collection means 7 which periodially collects the plant state signal S1 and the plant remote control command signal S2 from a plant 1 and a plant operation device 3 respectively, an interlock display control means 9 which produces the interlock display screen data S4 to show the operating state of a requested interlock after inputting the data S3 collected by the means 7 and then logically judging whether the data S3 are activated (esterblished), and an input/output device 11 which gives an interlock display request to the means 9 and also shows the interlock display screen produced by the means 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports operator's understanding of plant status by capturing data online with the plant and shaping and presenting the interlock operating status so that the operator can easily understand it. Interlock display device and interlock display method.

[0002]

2. Description of the Related Art When a plant accident occurs, the operator's consciousness level becomes very high and the workload becomes heavy. Furthermore, under such a condition, it is expected that it will be difficult to control the plant calmly due to the provision of excessive information such as an alarm. In particular, when an operation is performed when operating a device that is not normally used, it may be impossible to calmly determine why the device does not operate. In order to avoid such a situation, it is effective to present "how the equipment operates", that is, the plant interlock. Also, in a plant that has advanced automation,
Although the chances of operating each device will be reduced, on the other hand, there is a fear that the contents of automation will become a black box, and it is necessary to present the control logic of automation.

The plant interlock is described in the book as an instrumentation block diagram (IBD), but it takes time to retrieve an appropriate part that matches the current situation from a huge amount of information. It costs. The instrumentation block diagram shows the electrical / mechanical coupling of the plant control logic. An example of the description is shown in FIG. It is the content that the operating status of the interlock cannot be identified unless it is compared with the status of each device.

Even when an accident occurs in the plant and the operator wants to know the operation status of the interlock, the conventional instrumentation block diagram is searched, the contents of the block diagram are compared with the plant state, and the operation status of the interlock is understood. I was doing
It may take time and the appropriate response may be delayed. Therefore, when it is desired to know the operation status of the interlock, it has been desired that the plant status can be grasped accurately and easily in a short time by interacting with the computer system.

The interlock description example of FIG. 8 shows the logic of starting and stopping the pumps belonging to the A system, and the starting or stopping of the A pump is executed when one of the following conditions is satisfied. To be done.

(1) A pump start execution condition control switch (CS) is in the "on" position A start signal (automatic start signal) is generated and A pump bus bar voltage is present (2) A pump stop execution condition control switch (CS) Is in the "off" position ...
If (1) above is satisfied, the control switch (CS) is in the "pull and hold" position (the switch is pulled up and the contacts are floating). The operation mode selection switch (S / W) is in the "normal" position. And A or B valve is not fully open, or C valve is not fully open, and D valve is not fully open. A pump is overloaded or tripped.

As described above, the IBD representation is a block diagram of each device, and is not an information representation drawn for each purpose.
Its interpretation is difficult. Especially when a plant accident occurred and the documents related to the plant interlock were investigated and the plant status and equipment status corresponding to the interlock were checked, it would impose an excessive amount of labor on the operator and the situation It is also possible that there is an error in.

Therefore, if the conventional interlock description method and the interpretation in accordance with the conventional interlock description method are performed, it takes time and labor as information when the plant is abnormal, and it cannot be said that it is an appropriate operation method.

[0009] In place of the conventional interlock description method and the interpretation based on it, in order to allow the operator to easily and accurately understand the plant state, data is taken online from the plant and the operator's judgment process is avoided as much as possible. There has been a demand for an interlock display device that presents the operating status of the interlock regarding plant equipment.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in consideration of such a point, and it is easy to visually check the operation status of an interlock related to plant equipment without the operator having to make a complicated judgment. It is an object of the present invention to provide an interlock display device and an interlock display method that can be displayed in an understandable manner.

[0011]

That is, an interlock display device according to the invention of claim 1 is an input / output device for inputting an interlock display request and outputting an interlock display screen, and a plant operation for controlling a plant operation. Data collection means that periodically captures plant operation command signals from the equipment and plant status signals from the plant, and interlock display request, based on the unique information of the requested plant interlock, in a hierarchical block configuration. In addition to creating the expressed interlock diagram, based on the data collected by the data collection means, it is determined whether or not the condition is satisfied for each item indicated by each block of the interlock diagram, and the condition is satisfied in the interlock diagram. It is possible to identify the predetermined area of the block corresponding to the item judged to be Characterized by comprising the interlock display control means for outputting to the output device the interlock display screen displaying.

In the interlock display device according to the second aspect of the present invention, in the above configuration, the interlock display screen has a manual operation for establishing each item forming the lowest block of the interlock diagram. It is characterized by having a corresponding operation display section showing whether or not it is possible.

In the interlock display device according to a third aspect of the present invention, in the above structure, the interlock display control means inputs the data periodically collected by the data collecting means, and whether the condition is satisfied according to the state of the data. Input data storage means for converting and storing the signal indicating whether or not, and corresponding interlock diagram is created by the interlock display request, and stored in the input data storage means according to the preset logic for the interlock. Display data for making an logical judgment as to whether or not the condition is satisfied using the stored data and outputting an interlock display screen in which the result of the logical judgment and the data of the input data storage means are reflected in the interlock diagram to the input / output device And an editing unit.

In the interlock display device according to a fourth aspect of the present invention, in the above structure, the interlock display control means determines whether or not the interlock display is necessary based on the data periodically collected by the data collection means. Then
It is characterized by further comprising an automatic diagram requesting means for making an interlock display request to the display data editing means when it is judged to be necessary.

In the interlock display device according to a fifth aspect of the present invention, in the above structure, the plant device is specified on the screen by the input / output device so that the interlock display request of the plant device is displayed by the interlock display from the input / output device. It is sent to the control means.

According to the interlock display method of the invention of claim 6, there is provided a data collection step of periodically taking in a plant operation command signal from a plant operating device for controlling the operation of the plant and a plant status signal from the plant, and an operation from the operator. The data collected in the interlock diagram creation process that creates an interlock diagram that is expressed in a hierarchical block structure based on the unique information of the requested plant interlock by the interlock display request, and the data collected in the data collection process. Based on, the condition satisfaction determination step of determining whether or not the conditions are satisfied for each item indicated by each block of the interlock diagram created in the interlock diagram creation step,
An interlock screen display process that displays the interlock diagram created in the interlock diagram creation process on the screen and also displays the predetermined area of the block corresponding to the item determined to be satisfied in the condition satisfaction determination process in a distinguishable manner. It is characterized by having.

According to a seventh aspect of the present invention, there is provided an interlock display method, which comprises a data collecting step of periodically taking in a plant operation command signal from a plant operating device for controlling the operation of a plant and a plant state signal from the plant, and the data collecting step. The interlock display request automatic generation process that determines whether the interlock display is necessary based on the data collected in step 3, and issues the interlock display request when it is determined to be necessary, and the operator or interlock display request automatic generation By the interlock display request from the process, based on the unique information of the requested plant interlock,
Each block of the interlock diagram created in the interlock diagram creation process based on the data collected in the interlock diagram creation process that creates the interlock diagram represented by the hierarchical block structure and the data collection process The condition satisfaction determination process for determining whether each condition is satisfied and the interlock diagram created in the interlock diagram creation process are displayed on the screen, and the condition satisfaction determination process determines that the condition is satisfied. And an interlock screen display step of displaying a predetermined area of a block corresponding to an item in a distinguishable manner.

According to the interlock display method of the invention of claim 8, there is provided a data collection step of periodically taking in a plant operation command signal from a plant operating device for controlling the operation of the plant and a plant state signal from the plant, and an operation from the operator. The data collected in the interlock diagram creation process that creates an interlock diagram that is expressed in a hierarchical block structure based on the unique information of the requested plant interlock by the interlock display request, and the data collected in the data collection process. Based on, the condition satisfaction determination step of determining whether or not the conditions are satisfied for each item indicated by each block of the interlock diagram created in the interlock diagram creation step,
Based on the data collected in the data collection process, for each item that forms the lowest block of the interlock diagram created in the interlock diagram creation process, the operation to establish that item is a manual operation or an automatic operation. In addition to displaying the interlock diagram created in the corresponding operation determination process and the interlock diagram creation process on the screen,
A predetermined area of the block corresponding to the item determined to be satisfied in the condition satisfaction determination step is displayed in a distinguishable manner, and the manual operation or the automatic operation determined in the corresponding operation determination step is associated with each of the lowest blocks. And an interlock screen display step of displaying the same in an identifiable manner.

According to a ninth aspect of the present invention, there is provided an interlock display method, which comprises a data collecting step for periodically taking in a plant operation command signal from a plant operating device for controlling the operation of a plant and a plant state signal from the plant, and the data collecting step. The interlock display request automatic generation process that determines whether the interlock display is necessary based on the data collected in step 3, and issues the interlock display request when it is determined to be necessary, and the operator or interlock display request automatic generation By the interlock display request from the process, based on the unique information of the requested plant interlock,
Each block of the interlock diagram created in the interlock diagram creation process based on the data collected in the interlock diagram creation process that creates the interlock diagram represented by the hierarchical block structure and the data collection process Based on the data collected in the data acquisition process and the condition satisfaction determination process that determines whether the condition is satisfied for each item indicated by, the lowest block of the interlock diagram created in the interlock diagram creation process is displayed. For each item to be formed, the corresponding operation determination process that determines whether the operation to fulfill the item is manual operation or automatic operation, and the interlock diagram created in the interlock diagram creation process is displayed on the screen A predetermined area of the block corresponding to the item determined to be satisfied in the satisfaction determination step is displayed in a distinguishable manner, and the corresponding operation is determined. And having a interlock screen display step of been manually operated or automatically operated or a possible identification in association with the lowest block each display determination in extent.

[0020]

In the interlock display device of the present invention,
The data collecting means periodically collects and updates the plant status signal and the plant operation command signal from the plant and the plant operating device. The interlock display control means automatically judges whether or not the interlock display is required based on the interlock display request input from the operator through the input / output device or based on the data from the data collection means. If the automatic diagram requesting means for issuing a display request is provided, the interlock display request from the automatic diagram requesting means causes the requested plant interlock to have a unique screen frame, graphic, character information, etc. stored in advance. Based on the information, an interlock diagram represented by a hierarchical block structure is created and displayed on the input / output device as an interlock display screen. At the same time, the interlock display control means determines, based on the data collected by the data collection means, whether or not the condition is satisfied for each item indicated by each block in the interlock diagram, and responds to the item determined to be satisfied. The input / output device is requested to color-code a predetermined area of the block to be turned on and to identify such as lighting.

More preferably, the interlock display control means, based on the data from the data collection means, for each item forming the lowest block of the interlock diagram, the operation for establishing the item is a manual operation. Then, the input / output device is requested to determine whether it is an automatic operation or not, and display it in association with the lowest block.

Thus, when the operator needs it,
Alternatively, the operation status of the plant interlock can be automatically displayed on the screen in an easy-to-understand manner, and it is possible to assist the operator in grasping and understanding the plant state quickly and accurately. In addition, for each plant event related to interlock, the operation to establish the event is displayed as manual operation or automatic operation, so that the operator can perform the corresponding operation when he wants to operate the equipment as intended. It can be clearly shown.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of an interlock display device according to the present invention. In the figure, 1 is a plant, 3 is a plant operating device in a control room for controlling the operation of the plant 1, and 5 is a plant 1 and a plant operating device. It is an interlock display device that takes in data from the device 3 and displays the operation status of the interlock of the device on the screen in an easy-to-understand manner.

The interlock display device 5 is used in the plant 1.
Data collecting means 7 for collecting a plant state signal S2 indicating the operating state of the equipment and the state quantity measured by the instrument and a remote operation command signal S2 from the plant operating device 3 to the plant 1 at a constant cycle, and a data collecting means. The data S3 collected in step 7 is input, and a logical judgment is made as to whether or not the data is activated (established), and the interlock display screen data S4 showing the operation status of the requested interlock. And an input / output device 11 for making an interlock display request to the interlock display control means 9 and displaying the interlock display screen created by the interlock display control means 9. It consists of and.

The output signal S3 of the data collection means 7 is a request signal (not shown) from the interlock display control means 9.
It may be output according to the above, or may be output periodically. Further, since the data storage location is determined in advance, it is possible to select and send necessary data according to the request content from the interlock display control means 9.

The interlock display control means 9 creates the requested interlock display screen data in response to the interlock display request signal S5 from the input / output device 11 and sends it to the input / output device 11 as data S4. The interlock display control means 9 may be configured to judge its content based on the data S3 from the data collection means 7 and automatically output the interlock display screen. For example, as shown in FIG. 2, when the operator carries out the starting operation of the pump A, the pump A is normally started. Automatically display the lock display screen.
It is also possible to build up such knowledge and enhance the automatic display function.

As the input / output device 11, a combination of a display device such as a CRT display, a liquid crystal display and a plasma display and an input device such as a keyboard, a touch panel and a mouse is used. The input / output device 11 is an operator. The interlock display request is issued to the interlock display control means 9 by the operation of. The operation method in this case can be performed by designating the device to be output from the display screen of the device. Besides, it is also possible to specify the interlock to be displayed by the data input defined in advance. Further, the input / output device 11 displays the interlock diagram as shown in FIG. 3 edited by the interlock display control means 9, and determines whether or not the state is activated for each item constituting the interlock. Based on the data, color display, identification display such as lighting is performed.

FIG. 3 shows an example of an interlock diagram in which the contents substantially equivalent to the conventional interlock description example shown in FIG. 8 are expressed by the method of the present invention. This is the starting, stopping and starting conditions of the A pump. It is roughly classified and expressed.
Here, the types of interlock signals are A1 to A3 and B.
1, C1 to C11. When the start / stop signal is generated, each block (A1 to A3, B1, C3 to C6, C13, C14) surrounded by a lower thick frame shows one interlock actuation factor.

This block (A1 to A3, B1, C3 to
The operation sequence of C6, C13, and C14) is such that the operation state of the block is sequentially specified according to the operation state of each item in the block, and the interlock of the interlock such as the operation content of each device and the operation state of the relay contact is It is configured so that the states of the constituent elements can be easily recognized, and that it is possible to easily understand whether or not each constituent element satisfies the logic. With such a configuration, it is possible for the operator to easily understand the operation status of the interlock without going through a deep thinking process.

The interlock display device 5 presents these operating conditions on the interlock display screen by receiving the plant status signals (relay contacts, etc.) online.

In FIG. 3, AND logic is indicated by a symbol, and a portion without a logic symbol indicates an OR logic. The parts outside the block (D1 to D9) indicate the manual / automatic distinction, and the hatch parts (D1, D4, D5, D9)
Indicates manual control.

FIG. 4 shows a detailed structure of the interlock display control means 9 having an automatic display function, which is composed of an input data storage memory 13, a display data editing means 15, and an automatic operation drawing request means 17. ing.

The input data storage memory 13 receives the data S3 from the data collecting means 7, determines whether or not the data is activated (condition is satisfied), and turns on / off.
It is stored and saved in a predetermined position as a signal.

The display data editing means 15 is the input / output device 1
According to the interlock display request signal S5 from 1, the request screen editing function is provided, and at the same time, the address S6 of the input data for the unique screen is stored. That is, in accordance with the interlock display request signal S5 from the input / output device 11, it has a function of extracting the corresponding data S7 from the input data storage memory 13 by using the memory address of the data S7 indicating the operation status of the interlock according to the request. ing.

The automatic diagram requesting means 17 has a function as shown in the flowchart of FIG. As shown in the example of FIG. 2, when it is determined that the interlock display is necessary,
An interlock display request signal S8 is issued to the display data editing means 15.

The display data editing means 15 has A1 to A3, B1 and C1 as an example in the interlock diagram shown in FIG.
Data of C11 to C11 (hereinafter referred to as individual data) is read from the input data storage memory 13. If these states are ON, data for identifying the individual data area as ON is written in a predetermined location. Further, the display data editing means 15 has a function of judging whether or not the condition of individual data is satisfied, and has a function of storing the judgment result in a predetermined place for data editing.

The processing operation of the display data editing means 15 will now be described with reference to FIG. 6 by taking the interlock display screen shown in FIG. 5 as an example.

When the interlock display request signal is input, the display data editing means 15 receives the fixed drawing information storage section 2.
1 and the screen frames, figures, and characters stored in the character storage unit 23 are displayed on the input / output device 11. Further, the screen data collection unit 25 causes the data (A1 to A3, B1, C1 to C1) indicating the plant state from the input data storage memory 13.
C11, D1 to D9) are collected, and at the same time, corresponding portions of the screen frame are identified and displayed according to the operating state (ON / OFF) of each signal. In FIG. 5, A2 and C4 are displayed in a distinguishable manner.

Next, the logic data creating section 27
According to the logical formula created in advance, it is determined whether or not the logic is established based on the data indicating the plant state collected by the screen data collection unit 25 described above. The symbols shown on the left side of A1 to A3, etc. in the symbols shown in the logic data creation unit 27 of FIG. 6 are data indicating the plant state, and are discriminated by logical expressions such as OR and AND. However, there is a case where only the operation state of the signal is determined regardless of the logical expression like B1.

As a result, if the logic is satisfied, A4 and B
The parts shown on the right such as 2 are identified. The identification data is stored in the logic data storage unit 29, and the same code portions of the screen frame on the screen of the input / output device 11 are identified and displayed by a display method such as color-coded display, lighting display, and reverse display based on the identification data. .

Here, a specific display method regarding the interlock operation of the A pump has been described. In addition, various interlocks such as opening / closing of valves and operation / stop of equipment exist in the plant. The fixed information of the interlock display screen according to the expression of each interlock is secured and stored in the fixed drawing information storage unit and the character storage unit.
In addition to securing the input data storage memory, set the logic according to the unique logic content in the logic data creation unit and secure the logic data storage unit that stores the judgment result of each logic judged by the logic data creation unit. This makes it possible to display the operating status of all logics on the screen of the input / output device.

FIG. 5 shows an example of the interlock display screen of the A pump when the automatic start signal (1) is generated and the power is lost. Here, it is shown that the automatic start signal (1) for the A pump is generated, but the start has not been reached because there is no bus voltage of the power source of the A pump.

On the interlock display screen, the following areas are identified and displayed. The identification display area includes A2, A1, A2, and A2 due to the automatic start signal (1) being generated.
A4 due to the establishment of the OR logic of A3, C4 due to the low voltage of the A pump bus, and C3 to C6, C13, and C14.
C15 by the establishment of the OR logic of.

In this example, the areas E1 and E2 are A
Since it is judged by AND of 4 and B2, no identification is displayed.

FIG. 7 shows that after the automatic start signal (1) of the A pump is generated, the control switch of the A pump is turned off.
It is an example of an interlock display screen showing a response when an attempt is made to stop the A pump. In this case, since the start signal by the A pump automatic start signal generation is established,
The pump does not stop with the control switch "OFF".
If you want to stop the pump, you must turn the A pump control switch to "pull".
The fact that there is no hatch outside (D4) the block of the control switch "OFF" in the figure means that the pump cannot be stopped manually by the logic in this block.

Therefore, when it is desired to stop the A pump, it is necessary to control the block with the hatch.

In this case, the identification display area is the start signal (1).
A2 by A4 and A4 established by AND logic of A1 to A3
, B1 due to the presence of the A pump bus voltage, B2 that is satisfied under the independent condition, and E1 and E2 that are satisfied by the AND logic of A4 and B2. At this time, C1 due to the "off" operation of the A pump CS is displayed as an identification,
C13 is not identified because it follows the AND logic of C1 and C2.

As is apparent from the above description, it is extremely difficult for the operator to memorize all the interlocks of the plant. However, according to this embodiment, the conventional complicated structure shown in FIG. Instead of the description of the interlock, as an external support system, the operating status of the interlock can be easily understood and the plant status can be accurately determined without going through a difficult judgment process such as situation identification and interpretation according to the operator's interlock. An interlock display screen that can be grasped can be displayed.

The present invention can be applied not only to the plant interlock, but also to the alarm activation logic and the presentation of the operation status of the control logic of the controller.

[0051]

As described above, according to the present invention, the operating status of the interlock relating to the equipment of the plant can be displayed in a visually easy-to-understand manner without requiring complicated judgment, and an accident occurs. It is possible to assist the operator in grasping the plant state easily and accurately in an emergency such as time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an interlock display device of the present invention.

FIG. 2 is a flowchart showing an example of an interlock automatic display function according to the present invention.

FIG. 3 is a diagram showing an example of an interlock diagram expressed by the method of the present invention.

FIG. 4 is a block diagram showing a configuration example of interlock display control means in FIG.

FIG. 5 is a diagram showing an example of an interlock display screen according to the present invention.

6 is a diagram illustrating a processing function of the display data editing unit of FIG.

FIG. 7 is a diagram showing an example of an interlock display screen according to the present invention.

FIG. 8 is a diagram showing a conventional interlock description example.

[Explanation of symbols]

 1 ... Plant 3 ... Plant operating device 5 ... Interlock display device 7 ... Data collection means 9 ... Interlock display control means 11 ... Input / output device 13 ... Input data storage Memory 15 ... Display data editing means 17 ... Automatic drawing request means

Claims (9)

[Claims] 1. An input / output device for inputting an interlock display request and outputting an interlock display screen, and a plant operation command signal and a plant status signal from a plant from a plant operation device that controls the operation of the plant periodically. By the data collection means to be taken in and the interlock display request, based on the unique information of the requested plant interlock, an interlock diagram represented by a hierarchical block structure is created and collected by the data collection means. Based on the data, it is determined whether or not the condition is satisfied for each item indicated by each block in the interlock diagram, and the predetermined area of the block corresponding to the item determined to be satisfied in the interlock diagram is identified. Interlock display screen that can be displayed on the input / output device Interlock display device characterized by comprising the interlock display control means for force. 2. The interlock display screen has a corresponding operation display section that indicates whether or not the operation for establishing each item forming the lowest block of the interlock diagram is manual. The interlock display device according to claim 1, wherein: 3. The interlock display control means inputs the data periodically collected by the data collecting means, converts the data into a signal indicating whether or not a condition is satisfied according to the state of the data, and saves the input. The corresponding interlock diagram is created by the data storage means and the interlock display request, and whether or not the condition is satisfied by using the data stored in the input data storage means according to the preset logic for the interlock. And a display data editing means for outputting to the input / output device an interlock display screen in which the logic determination result and the data of the input data storage means are reflected in the interlock diagram. The interlock display device according to claim 1, wherein the interlock display device is provided. 4. The interlock display control means determines whether or not interlock display is necessary based on the data periodically collected by the data collection means, and edits the display data at the stage when it is determined to be necessary. 4. The interlock display device according to claim 3, further comprising an automatic diagram requesting means for making an interlock display request to the means. 5. The interlock display request for the plant device is sent from the input / output device to the interlock display control means by specifying the plant device from the screen on the input / output device. Item 5. The interlock display device according to any one of items 1 to 4. 6. A plant requested by a data collection process that periodically takes in a plant operation command signal from a plant operation device that controls the operation of a plant and a plant status signal from the plant, and an interlock display request from an operator. An interlock diagram creation step of creating an interlock diagram represented by a hierarchical block structure based on the unique information of the interlock, and the interlock diagram creation based on the data collected in the data collection process. A condition satisfaction determination step of determining whether or not a condition is satisfied for each item indicated by each block of the interlock diagram created in the step, and displaying the interlock diagram created in the interlock diagram creation step on the screen , The block corresponding to the item determined to be satisfied in the condition satisfaction determination step. And an interlock screen displaying step of displaying a predetermined area of the mask in an identifiable manner. 7. A data collection step of periodically taking in a plant operation command signal from a plant operating device for controlling the operation of a plant and a plant state signal from the plant, and an interlock based on the data collected in this data collection step. By the interlock display request automatic generation process that determines whether the display is necessary and issues an interlock display request when it is determined to be necessary, and the interlock display request from the operator or the interlock display request automatic generation process, Based on the unique information of the requested plant interlock, an interlock diagram creating step of creating an interlock diagram represented by a hierarchical block configuration, and based on the data collected in the data collecting step, Each block of the interlock diagram created in the interlock diagram creation process The condition satisfaction determination process for determining whether or not the condition is satisfied for each item indicated by the lock, the interlock diagram created in the interlock diagram creation process is displayed on the screen, and the condition is satisfied in the condition satisfaction determination process. And an interlock screen displaying step of displaying a predetermined area of the block corresponding to the item determined to be identifiable. 8. A plant requested by a data collection process that periodically takes in a plant operation command signal from a plant operation device that controls the operation of a plant and a plant status signal from the plant, and an interlock display request from an operator. An interlock diagram creation step of creating an interlock diagram represented by a hierarchical block structure based on the unique information of the interlock, and the interlock diagram creation based on the data collected in the data collection process. Based on the data collected in the data collection step, a condition satisfaction determination step of determining whether or not a condition is satisfied for each item indicated by each block of the interlock diagram created in the step, and the interlock diagram creation step For each item that forms the lowest block of the interlock diagram created in The operation for establishing the matter is a corresponding operation determining step of determining whether it is a manual operation or an automatic operation, the interlock diagram created in the interlock diagram creating step is displayed on the screen, and the condition is established in the determining step. A predetermined area of the block corresponding to the item determined to satisfy the condition is displayed in a distinguishable manner, and the manual operation or the automatic operation determined in the corresponding operation determination step can be identified by associating with the lowest block. And an interlock screen display step for displaying the interlock screen. 9. A data collecting step for periodically taking in a plant operation command signal from a plant operating device for controlling the operation of a plant and a plant state signal from the plant, and an interlock based on the data collected in the data collecting step. By the interlock display request automatic generation process that determines whether the display is necessary and issues an interlock display request when it is determined to be necessary, and the interlock display request from the operator or the interlock display request automatic generation process, Based on the unique information of the requested plant interlock, an interlock diagram creating step of creating an interlock diagram represented by a hierarchical block configuration, and based on the data collected in the data collecting step, Each block of the interlock diagram created in the interlock diagram creation process The condition is determined for each item shown in the table, and based on the data collected in the data collection process, the maximum of the interlock diagram created in the interlock diagram creation process is determined. For each item that forms a lower block, the corresponding operation determination process that determines whether the operation to fulfill the item is manual operation or automatic operation, and the interlock diagram created in the interlock diagram creation process on the screen In addition to displaying, a predetermined area of the block corresponding to the item determined to be satisfied in the condition satisfaction determination step is displayed in a distinguishable manner, and the manual operation or the automatic operation determined in the corresponding operation determination step is displayed. An interlock display method characterized by having an interlock screen display step of displaying in an identifiable manner in association with the lowest block .