JP6562677B2 - Web terminal and Web plant monitoring and control system using the same - Google Patents

Description

  The present invention relates to a Web terminal having a function of managing a timeout due to no operation in plant monitoring control, and a Web plant monitoring control system using the same.

  In the conventional technology, since the Web server manages the operation time information, if communication between the Web server and the Web terminal is not performed for a certain period of time after logging in to the system, a timeout occurs and the logout is forcibly performed. Was being processed. (For example, see Patent Document 1)

JP 2008-26945 A (pages 8-12, FIG. 1)

  In the conventional technology, since the Web server manages the operation time information, the time until timeout is not updated unless an operation to communicate with the Web server is performed from the Web terminal, and even if the user intends to operate Therefore, it was necessary to perform re-login processing each time.

  The present invention has been made in order to solve the above-described problems, and provides a Web terminal and a Web plant monitoring and control system using the Web terminal that do not generate a timeout even when only an operation that does not communicate with a Web server is performed. The purpose is to obtain.

The Web terminal according to the present invention is a Web terminal that configures a Web plant monitoring control system for remotely monitoring and controlling a plant together with a Web server. The Web terminal is based on monitoring data acquired from the plant as an operating mode. A mode type switching means for switching between the monitoring mode and the control mode as the mode of the Web terminal, having a monitoring mode for monitoring only the plant equipment and a control mode capable of controlling the plant equipment, and a Web server The operation time storage means for storing the operation time each time the operation of the web terminal is performed, that is, the operation of communicating with the web server or the operation not communicating with the web server , and the mode of the web terminal is in the control mode, and a new operation is performed. From the time of the previous operation stored in the operation time storage means. When the elapsed time is larger than the timeout time and the control mode timeout is determined, the control mode timeout is determined. The mode type switching means switches the mode of the Web terminal from the control mode to the monitoring mode.

According to the present invention, a Web terminal that configures a Web plant monitoring control system for remotely monitoring and controlling a plant together with a Web server, the Web terminal as a mode of operation based on monitoring data acquired from the plant. A mode type switching means for switching between a monitoring mode and a control mode as a mode of the Web terminal, which has a monitoring mode for only monitoring the device and a control mode capable of controlling the plant device, and communicates with the Web server Operation time storage means for storing the operation time each time an operation or an operation that does not communicate with the Web server is performed, and a new operation is performed when the mode of the Web terminal is in the control mode The elapsed time from the time of the previous operation stored in the operation time storage means, and the Web Comparing the time-out time separately downloaded from the server, when the elapsed time is larger than the time-out time, it comprises a determination means for determining the control mode time-out, and when the control mode time-out is determined, by the mode type switching means, Since the mode of the Web terminal is switched from the control mode to the monitoring mode, it is possible to prevent a control mode timeout from occurring even when the Web terminal only performs an operation that does not communicate with the Web server.

1 is a system configuration diagram showing a Web plant monitoring control system according to Embodiment 1 of the present invention. It is a flowchart which shows operation | movement of the Web terminal 1 of the Web plant monitoring control system by Embodiment 1 of this invention. It is explanatory drawing which shows the principal point of the Web plant monitoring control system by Embodiment 1 of this invention. It is a system block diagram which shows the Web plant monitoring control system by Embodiment 2 of this invention. It is a flowchart which shows operation | movement of the Web plant monitoring control system by Embodiment 2 of this invention. It is a block diagram which shows the Web terminal of the Web plant monitoring control system by Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the web terminal of the web plant monitoring control system by Embodiment 3 of this invention. It is explanatory drawing explaining operation | movement of the web terminal of the web plant monitoring control system by Embodiment 4 of this invention. It is explanatory drawing which shows operation | movement of the Web terminal of the Web plant monitoring control system by Embodiment 5 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a system configuration diagram showing a Web plant monitoring control system according to Embodiment 1 of the present invention.
In FIG. 1, a Web plant monitoring control system is connected to a Web terminal 1 that performs plant monitoring control on a Web browser and a network 3 in a plant, acquires plant monitoring data, and acquires the acquired plant monitoring data. The web server 2 is distributed to the web terminal 1.
The Web terminal 1 has a CPU and a storage device, and is configured as follows.
The operation time management function 11 (operation time storage means) manages the time when the Web terminal 1 performs an operation. The mode type information 12 is information indicating either the monitoring mode or the control mode of the Web terminal 1 and is stored in the storage device. The mode type switching function 13 (mode type switching means) switches the monitoring mode / control mode of the Web terminal 1. The timeout time information 14 is downloaded from the Web server 2 at the time of login to the Web plant monitoring control system and stored in the storage device.
The Web server 2 stores in the storage device time-out time information 21 that is a time used for determining a control mode time-out when the operation is not performed for a long time in the control mode. The timeout time information 21 is downloaded from the Web server 2 to the Web terminal 1 when the Web terminal 1 logs in to the Web plant monitoring control system.

FIG. 3 is an explanatory diagram showing the main points of the Web plant monitoring control system according to Embodiment 1 of the present invention.
FIG. 3A is a diagram showing a configuration in which the conventional Web server 2 manages the operation time, and FIG. 3B is a diagram showing a configuration in which the Web terminal 1 of the present invention manages the operation time.
In FIG. 3, 1, 2, 11, 14, 2, and 21 are the same as those in FIG. In the conventional example of FIG. 3A, the operation time management function 22 is arranged on the Web server 2.

Next, the operation will be described.
First, the operation time management of the present invention will be described with reference to FIG.
Conventionally, the operation time management function 22 is provided in the Web server 2 as shown in FIG. 3A, and therefore the previous operation time used for determining the control mode timeout of the Web terminal 1 is managed by the Web server 2. It was.
Therefore, conventionally, unless an operation for communicating with the Web server 2 is performed from the Web terminal 1, the Web server 2 cannot detect that the operation has been performed on the Web terminal 1, and the operation time is not updated. Had occurred.

This is because even if the user intends to operate, there is a case where the control mode timeout occurs and the mode is forcibly switched from the control mode to the monitoring mode. The operability will be impaired.
Therefore, in the present invention, as shown in FIG. 3B, the operation time management function 11 is provided in the Web terminal 1, and the operation time of the own Web terminal is managed so that the operation of the Web terminal 1 communicates with the Web server 2. The operation time is updated even for operations that are not performed (system menu operations, pull-down open / close, etc.).

Next, the operation of the Web terminal 1 according to the first embodiment will be described based on the flowchart of FIG.
When a user tries to perform an operation (screen development, device control, etc.) for communication with the Web server 2 from the Web terminal 1 (S1), it is first determined whether the mode type of the Web terminal 1 is a control mode or a monitoring mode. Performed (S2). At this time, the mode type information 12 included in the Web terminal 1 is acquired and a determination is made. As a result, if the mode is the control mode, the control mode timeout is subsequently determined (S3, determination means).
The no-operation time is calculated from the time when the user tried to communicate with the Web server 2 and the previous operation time managed by the operation time management function 11, the time is compared with the timeout time information 14, and the timeout time information If 14 is smaller, the control mode times out, no operation is performed, and the mode type switching function 13 forcibly switches to the monitoring mode (S4).

If the timeout time information 14 is larger in S3, the operation is executed as it is (S5).
If the mode type determination in S2 is the monitoring mode, it is determined whether the operation to be performed is a plant control operation (such as start of operation of the device) (S6). If it is a control operation, a message indicating that the operation cannot be performed in the monitoring mode is displayed on the screen, and the operation is not performed (S7).
If it is other than the control operation (screen development etc.) in S6, the operation is executed as it is (S5).

The Web plant monitoring and control system is considered to have a long non-operation time due to the role of monitoring. Therefore, if security measures are taken to log out from the Web plant monitoring and control system when there is no operation for a certain period of time, The role of monitoring cannot be fully fulfilled.
Therefore, providing the operation time management function 11 for managing the control mode timeout in the Web terminal 1 realizes a security measure that affects only the control operation of the plant without affecting the monitoring.

According to the first embodiment, when the plant is left in the control mode state in which the control operation of the plant is possible, the control mode is automatically switched to the monitoring mode at the next operation, so that the plant can be controlled by a third party. Unauthorized operation can be prevented.
In addition, since the operation time managed by the Web terminal 1 can be updated even when the operation does not communicate with the Web server 2, a control mode timeout does not occur even if the user intends to operate, ensuring user operability. It becomes possible to do.
Even if the Web terminal 1 manages the operation time, if there is no operation at all, the operation time is not updated and a control mode timeout occurs, so security is maintained.

Embodiment 2. FIG.
Embodiment 2 of the present invention will be described below with reference to the drawings.
FIG. 4 is a system configuration diagram showing a Web plant monitoring control system according to Embodiment 2 of the present invention.
In FIG. 4, 1, 2, 11-14 and 21 are the same as those in FIG. In FIG. 4, the Web server 2 is provided with a timeout time setting function 23 (timeout time setting means) for arbitrarily setting a timeout time used for determining the control mode timeout.

  In the Web plant monitoring and control system of the first embodiment, a control mode timeout occurs when there is no operation for a certain period of time in the control mode. However, in the second embodiment, the time until the control mode timeout is determined can be arbitrarily set Allows to change in time.

Next, the flow from the setting of the control mode timeout time to the control mode timeout determination of the Web plant monitoring control system of the second embodiment will be described with reference to FIG.
The timeout period used for the determination of the control mode timeout is set by the timeout period setting function 23 provided in the Web server 2, and is output as the timeout period information 21 (S11).
The timeout time information 21 is automatically downloaded from the Web server 2 to the Web terminal 1 when the Web terminal 1 logs in to the Web plant monitoring and control system (S12).
The control mode timeout described in the first embodiment is determined using the timeout time information 14 downloaded to the Web terminal 1 (S13).

  According to the second embodiment, it is possible to set the timeout time used for the control mode timeout determination in accordance with the user operation, and the user operability is ensured.

Embodiment 3 FIG.
The third embodiment of the present invention will be described below with reference to the drawings.
FIG. 6 is a block diagram showing a Web terminal of the Web plant monitoring control system according to Embodiment 3 of the present invention.
In FIG. 6, reference numerals 1, 11 to 14 are the same as those in FIG. In FIG. 6, the login user information 15 that holds the user ID and password at the time of login in the Web terminal 1 and the password determination function 16 that determines the validity of the re-input password using the login user information 15 ( Password determination means).

Next, login to the Web plant monitoring control system of the Web terminal 1 will be described with reference to FIG.
The Web plant monitoring control system can be used by inputting an ID and password for each user and logging in to the Web plant monitoring control system (S21). The user ID and password at the time of login are held in the Web terminal 1 as login user information 15 (S22).
Immediately after login, the monitoring mode is set, and when switching to the control mode, it is necessary to input the password for login again (S23). Including the case where the mode is forcibly switched to the monitoring mode due to the control mode timeout described in the first embodiment, it is essential to input the password when switching to the control mode again.
When the password is input, the password determination function 16 determines whether or not it matches the password of the login user information 15 held by the Web terminal 1 (S24). (S25). If they do not match, the control mode switching fails and the monitoring mode remains (S26).

  According to the third embodiment, even when the Web terminal 1 is left in a state where it is logged in to the Web plant monitoring and control system, it is possible to prevent a third party from switching to the control mode without permission and performing an unauthorized operation of the plant. be able to.

Embodiment 4 FIG.
Embodiment 5 of the present invention will be described below with reference to the drawings.
FIG. 8 is an explanatory diagram for explaining the operation of the Web terminal of the Web plant monitoring control system according to Embodiment 4 of the present invention.
In FIG. 8, 1, 12, and 13 are the same as those in FIG. In FIG. 8, the web browser 17 of the web terminal 1 is shown, and the web browser 17 includes the browser 1 and the browser 2.
FIG. 8A is a diagram illustrating a case where the browser 1 is switched from the monitoring mode to the control mode, and FIG. 8B is a diagram illustrating a case where the browser 1 is switched from the control mode to the monitoring mode.

The fourth embodiment relates to a case where the mode is switched while the monitoring screen is displayed from a plurality of browsers of the same Web terminal 1.
While a monitoring screen is being displayed from a plurality of browsers of the same Web terminal 1, one of the browsers, in this case, the browser 1 is switched from the monitoring mode to the control mode as shown in FIG. In this case, the internal mode type information of the Web terminal 1 is switched to the control mode, but the display of the other browser displayed in the monitoring mode (browser 2 in FIG. 8) is not switched to the control mode, but is in the monitoring mode. It remains. Thus, switching to the control mode needs to be performed for each browser.

  On the other hand, as shown in FIG. 8B, when the browser 1 is switched from the control mode to the monitoring mode (including forced switching by the control mode timeout), other browsers (browser 2 in FIG. 8) are also automatically operated. Automatically switches to monitoring mode.

  According to the fourth embodiment, by reducing the number of browsers in the control mode as much as possible, it is possible to reduce the risk of unauthorized operation of the plant.

Embodiment 5. FIG.
Embodiment 5 of the present invention will be described below with reference to the drawings.
FIG. 9 is an explanatory diagram showing the operation of the Web terminal of the Web plant monitoring control system according to Embodiment 5 of the present invention.
9, 1 and 17 are the same as those in FIG. In FIG. 9, a login state 18 indicating whether the Web terminal 1 is in a login state or a logout state is provided.
9A is a diagram showing a login state, FIG. 9B is a diagram when the browser 2 of the web browser 17 is closed, and FIG. 9C is a diagram when the browser 2 and the browser 1 of the web browser 17 are closed. FIG.
In FIG. 9B, the user is logged in, but in FIG. 9C, the user is logged out.

The fifth embodiment relates to a login state and a logout state of the Web terminal 1 to the Web plant monitoring control system.
When the user performs a logout operation on the Web terminal 1, the login state is released.
However, an explicit logout operation from the Web plant monitoring control system, such as when the Web terminal 1 suddenly loses power or goes to sleep with the Web browser 17 open, or when all the Web browsers 17 are closed, etc. Although not done, if an operation that the user considers to be interrupted or terminated use of the Web plant monitoring and control system is performed, there is a possibility that the login state to the Web plant monitoring and control system may remain. There is a risk that the system will be illegally used by the three parties.

For this reason, the fifth embodiment cancels the login state of the Web plant monitoring control system regardless of the monitoring mode / control mode when an operation that may leave the login state as described above is performed, When using the Web plant monitoring and control system again, be sure to start with login.
That is, the Web terminal 1 logs out from the Web plant monitoring and control system when the power supply is suddenly turned off or returned from the sleep state.
Further, as shown in FIG. 9C, even when all the Web browsers 17 are closed, the user logs out from the Web plant monitoring control system as in the login state 18 (logout state).

  According to the fifth embodiment, as a security measure other than the control mode timeout, when the user ends the use of the Web plant monitoring control system, a function that does not leave a login state to the Web plant monitoring control system is provided. Unauthorized operation of the plant by a third party can be prevented.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 Web terminal, 2 Web server, 3 network in plant,
11 operation time management function, 12 mode type information, 13 mode type switching function,
14 timeout time information, 15 login user information, 16 password judgment function,
17 Web browser, 18 login status, 21 timeout information,
22 Operation time management function, 23 Timeout time setting function

Claims (8)

A Web terminal that configures a Web plant monitoring control system for remotely monitoring and controlling a plant together with a Web server,
The Web terminal has, as operating modes, a monitoring mode for monitoring only the plant equipment based on monitoring data acquired from the plant, and a control mode capable of controlling the equipment of the plant. ,
Mode type switching means for switching between the monitoring mode and the control mode as the mode of the Web terminal,
An operation time storage means for storing an operation time each time the operation of the Web terminal is performed, which is an operation of communicating with the Web server and an operation of not communicating with the Web server ;
And when the mode of the Web terminal is the control mode and a new operation is performed, the elapsed time from the time of the previous operation stored in the operation time storage means and the timeout time separately downloaded from the Web server And determining means for determining a control mode timeout when the elapsed time is greater than the timeout time,
A Web terminal characterized in that, when the control mode timeout is determined, the mode type switching means switches the mode of the Web terminal from the control mode to the monitoring mode.   When switching the mode of the Web terminal from the monitoring mode to the control mode using login information in which a user ID and password used for logging in to the Web plant monitoring control system are stored in a storage device, 2. The Web terminal according to claim 1, further comprising password determining means for re-inputting a password and determining the validity of the re-input password by collating with the login information.   3. The Web terminal according to claim 1, further comprising a plurality of browsers for monitoring and control.   When the mode of the Web terminal is the control mode and one of the plurality of browsers is switched from the control mode to the monitoring mode by the mode type switching unit, other browsers also 4. The Web terminal according to claim 3, wherein the Web terminal is switched to the monitoring mode.   When the mode of the Web terminal is the monitoring mode and one of the plurality of browsers is switched from the monitoring mode to the control mode by the mode type switching unit, the other browsers 5. The Web terminal according to claim 3, wherein the monitoring mode cannot be switched to the control mode.   The web terminal according to any one of claims 3 to 5, wherein when all of the plurality of browsers are closed, the user logs out from the web plant monitoring and control system.   The web terminal according to any one of claims 1 to 6, wherein the web terminal logs out from the web plant monitoring and control system when the web terminal returns from a sleep state. The Web terminal according to any one of claims 1 to 7,
And a web server that causes the web terminal to download the timeout time when logging in to the web plant monitoring and control system of the web terminal,
The Web plant monitoring and control system, wherein the Web server has a timeout time setting means for arbitrarily setting the timeout time.

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