Granted Patent B2

US 12,436,524 · App. 18/007,487 · Granted Oct 7, 2025

Inventors: Ryo Shimizu (Tokyo, JP); Akira Nojima (Tokyo, JP); Nobuo Shimizu (Tokyo, JP)

Assignee: TMEIC CORPORATION

G05B19/4183G05B19/4185

Abstract

Claims (44)

1. A SCADA web HMI client device comprising:

a first monitor;

a second monitor; and

processing circuitry configured to

run a first web browser that is displayed on the first monitor and draws an HMI screen for monitoring and controlling an industrial plant;

run a second web browser that is displayed on the second monitor and draws the HMI screen;

obtain from a web server an operation right table that defines the operability of the HMI screen for each web browser, wherein the first web browser being not permitted to operate the HMI screen of the first monitor while the second web browser being permitted to operate the HMI screen of the second monitor by the operation right table;

based on the operation right table, run the first web browser to draw in an inoperable state an operation part positioned on the HMI screen of the first monitor; and

based on the operation right table, run the second web browser to draw in an operable state the operation part positioned on the HMI screen of the second monitor.

2. The SCADA web HMI client device according to claim 1 ,

wherein the processing circuitry is further configured to:

when a mouse pointer is over the operation part positioned on the HMI screen of the second monitor, change the shape or color of the mouse pointer from the inoperable state to the operable state; and

keep the shape or color of the mouse pointer unchanged from the inoperable state even if the mouse pointer is over the operation part positioned on the HMI screen of the first monitor.

3. The SCADA web HMI client device according to claim 1 ,

wherein the processing circuitry is further configured to:

display on the HMI screen an operation right identification part that indicates the operability of the HMI screen;

run the first web browser to draw in an operation prohibition color the operation right identification part positioned on the HMI screen of the first monitor; and

run the second web browser to draw in an operation permission color the operation right identification part positioned on the HMI screen of the second monitor.

4. The SCADA web HMI client device according to claim 1 ,

wherein the processing circuitry is further configured to:

under a condition that the first web browser is started again after exit, display the first web browser in a predetermined initial position and initial size on the first monitor independently of the position and size of the first web browser at the exit; and

under a condition that the second web browser is started again after exit, display the second web browser in a predetermined initial position and initial size on the second monitor independently of the position and size of the second web browser at the exit.

5. A SCADA web HMI system comprising:

an HMI server device configured to transmit and receive signals related to a field machinery group constituting an industrial plant to and from a programmable logic controller and configured to run a web server; and

an HMI client device comprising processing circuitry, a first monitor, and a second monitor,

wherein the processing circuitry is configured to:

run a first web browser that is displayed on the first monitor and draws an HMI screen for monitoring and controlling the industrial plant;

run a second web browser that is displayed on the second monitor and draws the HMI screen;

obtain from the web server an operation right table that defines the operability of the HMI screen for each web browser, wherein the first web browser being not permitted to operate the HMI screen of the first monitor while the second web browser being permitted to operate the HMI screen of the second monitor by the operation right table;

based on the operation right table, run the first web browser to draw in an inoperable state an operation part positioned on the HMI screen of the first monitor; and

based on the operation right table run the second web browser to draw in an operable state the operation part positioned on the HMI screen of the second monitor.

6. The SCADA web HMI system according to claim 5 ,

wherein the processing circuitry is further configured to:

when a mouse pointer is over the operation part positioned on the MHI screen of the second monitor, change the shape or color of the mouse pointer from the inoperable state to the operable state; and

keep the shape or color of the mouse pointer unchanged from the inoperable state even if the mouse pointer is over the operation part positioned on the HMI screen of the first monitor.

7. The SCADA web HMI system according to claim 5 ,

wherein the processing circuitry is further configured to:

display on the HMI screen an operation right identification part that indicates the operability of the HMI screen;

run the first web browser to draw in an operation prohibition color the operation right identification part positioned on the HMI screen of the first monitor; and

run the second web browser to draw in an operation permission color the operation right identification part positioned on the HMI screen of the second monitor.

8. The SCADA web HMI system according to claim 5 ,

wherein the processing circuitry is further configured to:

under a condition that the first web browser is started again after exit, display the first web browser in a predetermined initial position and initial size on the first monitor independently of the position and size of the first web browser at the exit; and

under a condition that the second web browser is started again after exit, display the second web browser in a predetermined initial position and initial size on the second monitor independently of the position and size of the second web browser at the exit.

Assignments (2)

Continuity (1)

References Cited (24)