JP2018022211A - Multi-window display device, monitoring control system, multi-window display method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily return to a screen immediately before switching and improve operability. SOLUTION: A multi-window type display device (20) for preferentially displaying one screen from a plurality of screens and a recording section (24) for recording the event of each screen as history information every time the screen is operated, and a time series. A display control unit (25) for controlling the display of the screen based on the arranged history information, and the display control unit switches the priority display from the active screen with the current history information to the active screen with the previous history information. I made it up. [Selection diagram] Fig. 3

Description

  The present invention relates to a multi-window display device, a monitoring control system, a multi-window display method, and a program for simultaneously displaying a plurality of windows on a display screen.

  Generally, various types of plants such as steel plants and chemical plants are provided with monitoring display devices for displaying various types of information. A multi-window display is adopted as the display device, and various devices have been devised to improve operability by tiling with multiple screens arranged side by side, and tab display that enables switching between screens that overlap each other by tabs. Yes. Further, in order to further improve operability, it is required to easily return to the previous screen when a screen is temporarily changed to another screen. For this reason, there has been proposed a multi-window display device that restores the screen before transition (see, for example, Patent Document 1).

JP-A-5-233203

  By the way, the display device described in Patent Document 1 rewrites the display content of the active screen in advance by the save operation, thereby rewriting the display content of the current screen from the display content of the current screen by the restore operation. However, in this display device, when returning to the previous screen, it is necessary to save the previous screen by a save operation in advance, and it is not possible to return to a screen that has not been saved. In this case, the original screen can be displayed again by a menu operation or the like, but there is a problem that if the operator does not store the previous screen, the target screen must be found.

  The present invention has been made in view of the above points, and can display a multi-window format display device, a monitoring control system, and a multi-window format display method that can easily return to the screen immediately before switching and improve operability. One of the purposes is to provide a program.

  The multi-window format display device of the present invention is a multi-window format display device that preferentially displays one screen from a plurality of screens, and a recording unit that records an event of each screen as history information each time a screen is operated, A display control unit that controls display of a screen based on history information arranged in time series, and the display control unit gives priority display from an active screen with current history information to an active screen with previous history information. It is characterized by switching.

  According to the present invention, since a screen event is recorded as history information every time a screen operation is performed, it is possible to check a screen event from the current history information to the previous history information. By switching from the screen that is active with the current history information to the screen that is active with the previous history information, it is possible to redisplay the screen that has been preferentially displayed immediately before. Therefore, it is possible to easily call the screen preferentially displayed immediately before a plurality of screens are displayed, and it is possible to improve the operability without the trouble of searching for the target screen.

It is a schematic block diagram of the monitoring control system of this Embodiment. It is a figure which shows an example of the screen of the tab display of this Embodiment. It is a block diagram of the display apparatus of this Embodiment. It is a figure which shows an example of the log | history information of this Embodiment. It is a figure which shows an example of the recording operation | movement of the historical information of this Embodiment. It is a figure which shows an example of the recording operation | movement of the historical information of this Embodiment. It is a flowchart which shows the flow of the screen return operation | movement of this Embodiment. It is a flowchart which shows the flow of the screen sending operation | movement of this Embodiment. It is a figure which shows an example of the screen of the tile display of a modification.

  Hereinafter, a supervisory control system including the multi-window display device according to the present embodiment will be described. FIG. 1 is a schematic configuration diagram of a monitoring control system according to the present embodiment. FIG. 2 is a diagram illustrating an example of a tab display screen according to the present embodiment.

  As shown in FIG. 1, the supervisory control system 1 is a distributed control system (DCS: Distributed Control System) for process control of various plants, and collects monitoring data from each device 18 installed in the plant. Control is performed according to the collection results. A plurality of control devices 11 connected to each device 18 such as a sensor and an actuator are provided in the lower layer of the monitoring control system 1. Each control device 11 is a controller having a microprocessor or the like, periodically collects monitoring data from each device 18 in the plant, and automatically controls the target device by PID (Proportional Integral Differential) control or the like.

  In the upper layer of the monitoring control system 1, an operator station 12 and a database station 13 connected to each control device 11 via a control network 15 are provided. Furthermore, a printer 14 is provided in the upper layer of the monitoring control system 1, and the operator station 12, the database station 13, and the printer 14 are connected to each other by an information network 16. The operator station 12 monitors the plant based on the monitoring data collected from each control device 11, and implements control value setting, control validation and invalidation, control status monitoring, etc. for each control device 11. doing.

  The database station 13 accumulates alarm history information about the plant and trend information of monitoring data over a long period of time. The printer 14 prints data input from an upper layer device such as the operator station 12. The control network 15 and the information network 16 include, for example, a local area network (LAN), a wide area network (WAN), and a public switched telephone network (PSTN). Further, the control network 15 and the information network 16 are not limited to a wired network, and may be configured by a wireless network.

  By the way, the operator station 12 is provided with a multi-window display device 20 for monitoring the control state of the plant. The display device 20 displays a plurality of screens such as a plant screen showing a schematic configuration of the plant and a trend screen showing a temporal change in the state of each device 18. The operator selects one screen from among a plurality of screens to display the selection screen with priority and perform monitoring work. There are various display methods such as tab display, tile display, and floating display as the display method in the multi-window format. In the following description, tab display will be described as an example.

  For example, as shown in FIG. 2A, four types of screens associated with tabs A-D are displayed as tabs, and the plant screen of tab A is displayed with priority. As shown in FIG. 2B, by selecting tab B that is not preferentially displayed, the trend screen of tab B is displayed in the foreground, and the plant screen of tab A moves to the back side of the trend screen. In this way, in the tab display, an arbitrary screen is selected from a plurality of screens overlapped in the front and rear, and is displayed preferentially on the forefront. In the tab display, an upper limit is set for the number of screens that can be displayed, and when the upper limit number of screens are opened and further screens are opened, for example, the oldest screen is closed so as not to exceed the upper limit number. .

  In the display device, work is performed while switching a plurality of screens by an operator for plant monitoring and equipment operation. For example, after the plant screen of tab A is displayed, the trend screen of tab B is displayed, and the history screen of tab C is further displayed, and then the plant screen of tab A is displayed again. In this operation, the operator may want to return to the trend screen of the immediately preceding tab B while displaying the tab C history screen (not shown). In this case, the operator can select the tab B to preferentially display the trend screen, but the operator needs to remember that the tab B is the target trend screen.

  In particular, when two or three screens are shifted from the tab B trend screen due to an abrupt interruption operation such as an alarm response, the operator may not be able to remember the tab associated with the target trend screen. Here, in the tab display, the tabs are arranged in the order in which the screens are opened, but the tabs are not rearranged in the priority display order, and the target tab B can be selected by looking at the tab arrangement. Not exclusively. For example, when tab A is positioned in front of tab B in the arrangement of tabs, but the tabs are selected in the order of tab A, tab C, and tab B, and the screen is displayed, immediately before the trend screen of tab B The screen opened in step 1 is not the tab A plant screen but the tab C history screen.

  Further, if the tab C history screen is closed immediately before the tab B trend screen is preferentially displayed, the tab C history screen cannot be found even if the tab is searched. For this reason, in general tab display, an operator has to select all the tabs to find a target trend screen or newly open a target trend screen, which is a troublesome work. Therefore, in the display device 20 of the present embodiment, an event of each screen is recorded as history information every time a screen operation is performed, and a screen return operation for preferentially displaying the previous screen based on the history information arranged in time series. The screen feed operation for displaying the screen immediately after the priority display is performed.

  Hereinafter, the display device and history information of the operator station will be described with reference to FIGS. 3 and 4. FIG. 3 is a block diagram of the display device of this embodiment. FIG. 4 is a diagram illustrating an example of history information according to the present embodiment. Note that FIG. 3 is a simplified block diagram for explaining the present embodiment, and it is assumed that the configuration normally provided in the display device is provided.

  As illustrated in FIG. 3, the display device 20 is configured to receive a screen operation by the input unit 21 and input the screen operation to the control unit 22, and display the screen generated by the control unit 22 on the display unit 23. The control unit 22 controls the screen display in the multi-window format and controls the screen return operation and the screen feed operation described above. Note that the screen return operation and the screen advance operation may be called by, for example, the operation return key and the operation feed key assigned to the input unit 21, or the operation return button and the operation feed button displayed on the menu screen. May be invoked by command.

  The control unit 22 includes a recording unit 24 that records an event of each screen as history information every time a screen operation is performed, and a screen display based on the history information. A display control unit 25 for controlling the history information and an erasing unit 26 for resetting history information are provided. The recording unit 24 records changes in the screen according to screen operations such as screen display, deletion, and switching operations as history information. Since history information is recorded for each screen operation, the history information is arranged in time series with one screen operation as one unit. Thus, a series of changes in each screen according to the screen operation is managed as history information.

  As shown in FIG. 4, in the history information, events for each screen are recorded for each history No. arranged in time series. There are four types of events: active, inactive, open, and closed. Active indicates an event in which the screen is preferentially displayed, and inactive indicates an event in which the preferential display on the screen is released. “Open” indicates an event that a screen is newly opened, and “Close” indicates an event that the screen is erased. In the history information, the ID of each screen is recorded in association with these four types of events. Details of the history information recording operation by the recording unit 24 will be described later.

  Returning to FIG. 3, the display control unit 25 controls the screen return operation for switching the priority display from the active screen with the current history information to the active screen with the previous history information based on the history information arranged in time series. . In the screen returning operation, the past screen is preferentially displayed by tracing back the history information arranged in time series. Further, the display control unit 25 controls the screen sending operation for switching the priority display from the screen active with the current history information to the active screen with the history information immediately after, based on the history information arranged in time series. The screen forwarding operation is performed after the screen returning operation, and the history information arranged in time series is advanced in the direction opposite to the operation returning direction, and the screen before the screen returning operation is preferentially displayed.

  The erasing unit 26 resets the history information recorded by the recording unit 24 when the operator of the display device 20 is changed. For example, the history information may be reset by detecting that the operator has logged out from the display device 20, or the history information may be reset by a reset operation by the operator. As a result, the history information of the previous operator is not taken over, so that the screen of the previous operator is not reproduced even if the current operator performs the screen return operation or the screen advance operation. Thus, the current operator is not confused.

  In addition, each part of the control part 22 is comprised by the processor, memory, etc. which perform various processes. The memory is composed of one or a plurality of storage media such as a ROM (Read Only Memory) and a RAM (Random Access Memory) depending on the application. The memory stores a program for causing the display device 20 to execute the multi-window display method of the present embodiment. Moreover, the program of this Embodiment may be memorize | stored in a storage medium. The recording medium is not particularly limited, but may be a non-transitory recording medium such as an optical disk, a magneto-optical disk, or a flash memory.

  The history information recording operation, screen returning operation, and screen forwarding operation will be described with reference to FIGS. 5 and 6 are diagrams showing an example of the history information recording operation of the present embodiment. In FIGS. 5 and 6, the left side of the drawing shows an event, and the right side of the drawing shows history information. 5 and 6, it is assumed that the upper limit number of screens that can be displayed in tabs is set to four.

  As shown in FIG. 5, when the screen A is opened in a non-display state, the screen A is preferentially displayed. At this time, history No. of history information. The screen ID of screen A is recorded in 1 active and open. Next, when the screen B is opened, the priority display of the screen A is cancelled, and the screen B is moved to the back to be displayed with priority. At this time, history No. of history information. The screen ID of the screen B is recorded in the active screen B, the screen A is inactive, and the screen ID of the screen B is opened. Next, when the screen C is opened, the priority display of the screen B is canceled and the screen C is moved to the back to display the screen C with priority. At this time, history No. of history information. 3, the screen ID of the screen C is recorded, the screen B of the screen C is recorded inactive, and the screen ID of the screen C is recorded open.

  Next, when the screen D is opened, the priority display of the screen C is canceled and the screen D is moved to the back and the screen D is preferentially displayed. At this time, history No. of history information. The screen ID of 4 is recorded in the screen D, the screen C is inactive, and the screen ID of the screen D is recorded in the open state. Next, when the tab C is selected, the priority display of the screen D is canceled, and the screen C is preferentially displayed by moving to the back. At this time, history No. of history information. The screen ID of the screen C is recorded in the active mode 5 and the screen ID of the screen D is recorded in the inactive mode. Next, when the screen C is closed, the screen D moves to the front and is preferentially displayed. At this time, history No. of history information. The screen ID of the screen D is recorded in the active screen 6 and the screen ID of the screen C is recorded in the closed state.

  Next, when the screen E is opened, the priority display of the screen D is canceled, and the screen E is moved to the back to display the screen E with priority. At this time, history No. of history information. 7 is recorded in the screen E, the screen D is inactive, and the screen ID of the screen E is recorded in the open state. Next, when the screen F is opened, the priority display of the screen E is cancelled, and the screen F is moved to the back to display the screen F with priority. Since the number of screens exceeds the upper limit of 4, screen A that is displayed first is closed. At this time, history No. of history information. The screen ID of 8 is recorded in the screen F, the screen E is inactive, the screen F is opened, and the screen ID is closed.

  As shown in FIG. 6, when the screen G is opened, the priority display of the screen F is canceled and the screen G is moved to the back and the screen G is preferentially displayed. Since the number of screens exceeds the upper limit of 4, screen B displayed second is closed. At this time, history No. of history information. The screen ID of the screen G is recorded in 9 active, the screen F in inactive, the screen G in open, and the screen B in closed. Next, when the tab E is selected, the priority display of the screen G is cancelled, and the screen E is moved to the back and the screen E is displayed with priority. At this time, history No. of history information. The screen ID of screen E is recorded in 10 active and the screen ID of screen G is recorded in inactive.

  Next, when the screen E is closed, the screen G moves to the front and is preferentially displayed. At this time, history No. of history information. 11, the screen ID of the screen G is recorded in the active state, and the screen ID of the screen E is recorded in the close state. Next, when the screen A is opened, the priority display of the screen G is canceled, and the screen A is moved to the back to display the screen A with priority. At this time, history No. of history information. The screen ID of 12 is recorded in the screen A, the screen G is inactive, and the screen ID of the screen A is recorded in the open state. Next, when the screen A is closed, the screen G moves to the front and is preferentially displayed. At this time, history No. of history information. The screen ID of the screen G is recorded in 13 active, and the screen ID of the screen A is recorded in closed.

  Next, when the screen G is closed, the screen F moves to the front and is preferentially displayed. At this time, history No. of history information. The screen ID of the screen F is recorded in the active 14 screen, and the screen ID of the screen G is recorded in the closed screen. Next, when the screen F is closed, the screen D moves to the front and is preferentially displayed. At this time, history No. of history information. The screen ID of the screen D is recorded in the active 15 and the screen ID of the screen F is recorded in the closed, respectively. Then, all the screens are closed by closing the screen D, and the history No. The screen ID of the screen D is recorded at 16 close. In this way, a screen display that changes with each screen operation is recorded as history information.

  Here, an example of the screen return operation will be described. When the recording unit 24 records an active screen with the previous history information as an inactive screen with the current history information, the display control unit 25 switches from the active screen to the inactive screen with the current history information. The priority display is switched. For example, the current history information is history No. 8 is the history No. 8, the priority display is switched from the active screen F to the inactive screen E. The current history information is history No. History No. 8 one previous from No. 8 Is changed to 7. As a result, history No. No. 8 immediately before the priority display was canceled. 7, the screen E is preferentially displayed again.

  Further, when the recording unit 24 records an active screen with the previous history information as a screen closed with the current history information, the display control unit 25 is closed from the active screen with the current history information. Switch the priority display to the screen. For example, the current history information is history No. 6 is the history No. 6, the priority display is switched from the active screen D to the closed screen C. The current history information is history No. The previous history No. 6 to 6 Changed to 5. As a result, history No. No. 6 immediately before being closed in No. 6 The screen C of No. 5 is preferentially displayed again.

  Next, an example of the screen feeding operation after the screen returning operation will be described. When the recording unit 24 records a screen opened with the immediately subsequent history information, the display control unit 25 switches the priority display from the active screen with the current history information to the screen opened with the immediately following history information. . For example, the current history information is history No. 7, history No. 7 from the active screen E. The priority display is switched to the screen F opened in FIG. The current history information is history No. History No. 1 after 7 It is changed to 8. As a result, the history No. immediately after (before the screen return operation) is set. The screen F opened in step 8 is preferentially displayed again.

  In addition, when the recording unit 24 records the screen closed with the history information immediately after as the active screen with the current history information, the display control unit 25 closes the active screen with the current history information. For example, the current history information is history No. 15, the history No. At 15, the active screen D is closed. The current history information is history No. History No. 1 after 15 It is changed to 16. As a result, the history No. immediately after (before the screen return operation) is set. 16 screens D are closed again.

  These screen return operation and screen advance operation are performed by the recording unit 24 without being recorded in the history information. This is because when history information is overwritten by the screen return operation and screen advance operation, the history information arranged in time series cannot be traced. For example, the current history No. No. 8 to the previous history No. When the history information is recorded during the screen return operation to the screen No. 7, the current history information is recorded as the history No. 7 and the previous history information is history No. It is changed to 8. Next, when the screen return operation is performed, the current history No. No. 7 immediately before the history No. Returning to 8, the screen returning operation is repeated between the two pieces of history information.

  With reference to FIGS. 7 and 8, the multi-window display method will be described in detail. FIG. 7 is a flowchart showing the flow of the screen returning operation of the present embodiment. FIG. 8 is a flowchart showing the flow of the screen feed operation according to the present embodiment. Note that the flowcharts of FIGS. 7 and 8 show an example, and the present invention is not limited to this configuration. 7 and 8 will be described with reference to FIG. 5 as appropriate for convenience of explanation. Further, as described above, the screen return operation and the screen advance operation are performed without being recorded in the history information.

  As shown in FIG. 7, when the screen return operation is performed by the operator, the display control unit 25 displays the current history No. as history information. i is acquired (step S01), the current history No. It is determined whether or not a screen ID is recorded when i is opened (step S02). Current history No. If the screen ID is recorded in the opening of i (Yes in step S02), the current history No. The screen ID is deleted from the opening of i (step S03), and the current history No. It is determined whether or not a screen ID is recorded in i inactive (step S04).

  Current history No. If the screen ID is recorded in i inactive (Yes in step S04), the current history No. The screen with the screen ID recorded in i inactive is preferentially displayed (step S05). The current history No. i is the previous history No. i. It is changed to i-1 (step S06). In this way, the history No. after the priority display is canceled. The history No. 1 before the priority display is released from i. The screen is switched to the i-1 screen (for example, the history No. 8 is switched to the history No. 7). On the other hand, the current history No. If the screen ID is not recorded in i inactive (No in step S04), the previous history No. The current history No. is not changed to i-1. i is maintained (for example, history No. 1).

  Current history No. If the screen ID is not recorded in the opening of i (No in step S02), the current history No. It is determined whether or not the screen ID is recorded in the closing of i (step S07). Current history No. If the screen ID is recorded in the close of i (Yes in step S07), the current history No. The screen with the screen ID recorded in the closing of i is preferentially displayed (step S08). The current history No. i is the previous history No. i. It is changed to i-1 (step S09). In this way, the history No. i from the history No. before screen erasure. The screen is switched to the i-1 screen (for example, the history No. 6 is switched to the history No. 5).

  Current history No. If the screen ID is not recorded in the closing of i (No in step S07), the current history No. It is determined whether or not a screen ID is recorded in i active (step S10). Current history No. If the screen ID is recorded in i active (Yes in step 10), the current history No. The screen of the screen ID recorded i inactive is preferentially displayed (step S11). The current history No. i is the previous history No. i. It is changed to i-1 (step S12). In this way, the history No. after the priority display is canceled. The history No. 1 before the priority display is released from i. The screen is switched to the screen i-1 (for example, the history No. 5 is switched to the history No. 4). On the other hand, the current history No. If no screen ID is recorded in i (No in step 10), the process ends without performing the screen return operation.

  As shown in FIG. 8, when the screen feed operation is performed by the operator, the display control unit 25 displays the next history No. as display information. i + 1 is acquired (step S21), and the history No. It is determined whether or not i + 1 exists (step S22). The next history No. If i + 1 does not exist (No in step S22), the process ends without performing the screen feed operation. On the other hand, the next history No. If i + 1 exists (Yes in step S22), the history No. It is determined whether or not a screen ID is recorded in i + 1 open (step S23).

  The next history No. When the screen ID is recorded in the opening of i + 1 (Yes in step S23), the history No. The screen with the screen ID recorded in the i + 1 open is preferentially displayed (step S24). The current history No. The history No. i after i is one. i + 1 is changed (step S25). In this way, the current history No. The history No. after display of a new screen from the screen of i. The screen is switched to the newly displayed screen at i + 1 (for example, the history No. 7 is switched to the history No. 8). On the other hand, the next history No. When the screen ID is not recorded in the opening of i + 1 (No in step S23), the history No. It is determined whether or not the screen ID is recorded in i + 1 close (step S26).

  The next history No. When the screen ID is recorded in the close of i + 1 (Yes in step S26), the history No. The screen ID recorded in the close of i + 1 is deleted (step S27). The current history No. The history No. i after i is one. It is changed to i + 1 (step S28). In this way, the current history No. The screen preferentially displayed with i is deleted and the history No. The screen is switched to the i + 1 screen (for example, the history No. 14 is switched to the history No. 15). The next history No. When the screen ID is not recorded in the close of i + 1 (No in step S26), the history No. It is determined whether or not the screen ID is recorded in i + 1 active (step S29).

  The next history No. When the screen ID is recorded in i + 1 active (Yes in step S29), the history No. The screen of the screen ID of i + 1 that is actively recorded is preferentially displayed (step S30). The current history No. The history No. i after i is one. It is changed to i + 1 (step S31). In this way, the current history No. History No. 1 displayed preferentially from i. The screen is switched to the i + 1 screen (for example, the history No. 9 is switched to the history No. 10). On the other hand, the next history No. If the screen ID is not recorded in i + 1 active (No in step S29), the process ends without performing the screen feed operation.

  As described above, in the display device 20 of the multi-window format according to the present embodiment, the screen event is recorded as the history information every time the screen is operated, so the screen is traced back to the previous history information from the current history information. Event can be confirmed. By switching from the screen that is active with the current history information to the screen that is active with the previous history information, it is possible to redisplay the screen that has been preferentially displayed immediately before. Therefore, it is possible to easily call the screen preferentially displayed immediately before a plurality of screens are displayed, and it is possible to improve the operability without the trouble of searching for the target screen.

  In addition, although the example which applied the display method of the above-mentioned multi-window format of this Embodiment to the tab display was demonstrated, it is applicable also to another multi-window format. For example, the present invention can be applied to a tile display as shown in FIG. In the tile display, a plurality of screens are displayed side by side vertically and horizontally, and the preferentially displayed screen is highlighted by the cursor frame 30. Even in such a tile display, the operability of the operator can be improved similarly to the tab display by moving the cursor frame 30 by the screen return operation and the screen advance operation to switch the priority display of the screen.

  Further, the input unit 21 of the present embodiment described above may be configured in any way as long as it can be input to the display device 20. For example, as the input unit 21, a character input device, a pointing device, or a voice recognition device may be used. A keyboard or the like may be used as the character input device, and a mouse, a trackball, a trackpad, or the like may be used as the pointing device.

  The display unit 23 of the present embodiment described above may be configured in any way as long as it can display a screen. For example, as the display unit 23, a liquid crystal display, a plasma display, a cathode ray tube display, or a film type display may be used. As the film type display, an organic EL (Electroluminescent), a liquid crystal film, or the like may be used.

  Further, in the present embodiment described above, four types of events of active, inactive, open, and closed are illustrated as events of history information, but the present invention is not limited to this configuration. The history information may include other events, and may include various types of information such as display times other than events.

  Further, in the above-described embodiment, the present invention is not limited to the configuration in which the screen returning operation and the screen forwarding operation are performed on a plurality of screens displayed by different modules in the software, but the screens displayed on a plurality of softwares. The screen return operation and the screen advance operation may be performed. For example, it is possible to switch the priority display between a screen displayed not only with plant software but also with other software such as a WEB browser.

  Moreover, although embodiment and modification of this invention were demonstrated, what combined the said embodiment and modification as the other embodiment of this invention entirely or partially may be sufficient.

  The embodiments of the present invention are not limited to the above-described embodiments and modifications, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea of the present invention. Further, if the technical idea of the present invention can be realized in another way by technological advancement or other derived technology, the method may be used. Accordingly, the claims cover all embodiments that can be included within the scope of the technical idea of the present invention.

  In the embodiment of the present invention, the configuration in which the present invention is applied to a display device installed in a plant monitoring and control system has been described. However, other display devices whose operability is improved by a screen return operation and a screen feed operation. It is also possible to apply to.

The feature points in the above embodiment are organized below.
The multi-window display device described in the above embodiment is a multi-window display device that preferentially displays one screen from a plurality of screens, and records each screen event as history information every time the screen is operated. And a display control unit that controls screen display based on history information arranged in time series, and the display control unit changes from an active screen with current history information to an active screen with previous history information. It is characterized by switching the priority display.

  The multi-window format display method described in the above embodiment is a multi-window format display method in which one screen is preferentially displayed from a plurality of screens, and an event of each screen is recorded as history information every time the screen is operated. And a step of switching the priority display from the screen active in the current history information to the active screen in the previous history information based on the history information arranged in time series.

  According to these configurations, since a screen event is recorded as history information every time a screen operation is performed, it is possible to check a screen event from the current history information to the previous history information. By switching from the screen that is active with the current history information to the screen that is active with the previous history information, it is possible to redisplay the screen that has been preferentially displayed immediately before. Therefore, it is possible to easily call the screen preferentially displayed immediately before a plurality of screens are displayed, and it is possible to improve the operability without the trouble of searching for the target screen.

  In the display device of the multi-window format described in the above embodiment, the recording unit records an active screen with the previous history information as an inactive screen with the current history information, and the display control unit The priority display is switched from the active screen to the inactive screen in the history information. According to this configuration, it is possible to redisplay the screen that has been preferentially displayed immediately before, with the priority display of the previous screen being canceled and the current screen preferentially displayed.

  In the display device of the multi-window format described in the above embodiment, the recording unit records an active screen with the previous history information as a screen closed with the current history information, and the display control unit The priority display is switched from the active screen to the closed screen in the history information. According to this configuration, it is possible to redisplay the screen that has been preferentially displayed immediately before, with the screen preferentially displayed immediately before being closed and the current screen preferentially displayed.

  In the display device of the multi-window format described in the above embodiment, the display control unit switches the priority display from the screen active with the current history information to the active screen with the history information immediately after. According to this configuration, the screen that has been preferentially displayed immediately after it is switched from the screen that is active with the current history information to the screen that is active with the history information immediately after can be displayed again. Therefore, it is possible to easily call the screen immediately after a plurality of screens are displayed.

  In the display device of the multi-window format described in the above embodiment, the recording unit records a screen opened with the immediately subsequent history information, and the display control unit immediately follows the active screen with the current history information. Switch the priority display to the screen opened with the history information. According to this configuration, it is possible to redisplay the screen opened immediately after the current screen is preferentially displayed by going back in the history information.

  In the display device of the multi-window format described in the above embodiment, the recording unit records a screen closed with the immediately subsequent history information as an active screen with the current history information, and the display control unit Close active screen with history information. According to this configuration, the current preferentially displayed screen can be closed while the current screen is preferentially displayed by going back in the history information.

  In the multi-window display device described in the above embodiment, the recording unit does not record history information when a screen is operated by the display control unit. According to this configuration, since history information is not overwritten by a screen operation by the display control unit, history information arranged in time series can be traced.

  The monitoring control system described in the embodiment includes the multi-window display device described above, and a control device that collects output from the target device and controls driving of the target device, and is collected by the control device. The output is displayed on the multi-window display device, and the target device is monitored. According to this configuration, the operability of the multi-window display device is improved, so that the target device can be efficiently monitored.

  The program described in the above embodiment is a program that preferentially displays one screen from a plurality of screens on a multi-window display device, and records the event of each screen as history information each time a screen is operated. Switching the priority display from the active screen in the current history information to the active screen in the previous history information based on the history information arranged in a series, and causing the multi-window display device to execute . According to this configuration, by installing the program in the display device, it is possible to easily call the screen that is preferentially displayed immediately before a plurality of screens are displayed on the display device.

  As described above, the present invention has an effect that it is possible to easily return to the screen immediately before switching and improve operability, and in particular, a multi-window format display used in a plant monitoring and control system. It is useful for devices, supervisory control systems, multi-window display methods, and programs.

DESCRIPTION OF SYMBOLS 1 Monitoring control system 11 Control apparatus 12 Operator station 13 Database station 14 Printer 15 Control network 16 Information network 20 Display apparatus 21 Input part 25 Display control part 23 Display part 24 Recording part 26 Erase part

Claims (10)

A multi-window display device that preferentially displays one screen from a plurality of screens,
A recording unit that records each screen event as history information each time a screen is operated;
A display control unit that controls display of the screen based on history information arranged in time series,
The multi-window display apparatus, wherein the display control unit switches the priority display from a screen active with current history information to an active screen with previous history information. The recording unit records an active screen in the previous history information as an inactive screen in the current history information,
The multi-window display device according to claim 1, wherein the display control unit switches priority display from an active screen to an inactive screen based on current history information. The recording unit records the active screen with the previous history information as a screen closed with the current history information,
2. The multi-window display device according to claim 1, wherein the display control unit switches the priority display from an active screen to a closed screen based on current history information.   4. The multi-window format according to claim 1, wherein the display control unit switches the priority display from an active screen with current history information to an active screen with immediately subsequent history information. 5. Display device. The recording unit records a screen opened with history information immediately after,
5. The multi-window display device according to claim 4, wherein the display control unit switches the priority display from a screen active with current history information to a screen opened with immediately subsequent history information. The recording unit records the screen closed with the history information immediately after as the active screen with the current history information,
5. The multi-window display device according to claim 4, wherein the display control unit closes an active screen with current history information.   7. The multi-window display apparatus according to claim 1, wherein the recording unit does not record history information when a screen is operated by the display control unit. A multi-window display device according to any one of claims 1 to 7,
A control device that collects output from the target device and controls driving of the target device;
A monitoring control system, wherein the target device is monitored by causing the output collected by the control device to be displayed on the multi-window display device. A multi-window display method that preferentially displays one screen from a plurality of screens,
Recording each screen event as history information for each screen operation;
And a step of switching the priority display from the screen active in the current history information to the active screen in the previous history information based on the history information arranged in time series. A program that preferentially displays one screen from a plurality of screens on a multi-window display device,
Recording each screen event as history information for each screen operation;
Switching the priority display from the active screen in the current history information to the active screen in the previous history information based on the history information arranged in time series, and causing the multi-window display device to execute Program to do.

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