SCADA web HMI client apparatus and SCADA web HMI system

A Supervisory Control And Data Acquisition (SCADA) web Human Machine Interface (HMI) system, comprising:

• an HMI server apparatus configured to execute a web server;
• and an HMI client apparatus configured to execute at least one web browser communicating with the web server, wherein
• the HMI server apparatus includes a server processor and a server memory,
• the server memory stores image data on an HMI screen to supervise an industrial plant, screen operation authority information, and exception information, the screen operation authority information defining operation permission/prohibition of the HMI screen for each web browser, the exception information defining operation permission/prohibition of each of specific operation parts on the HMI screen for each web browser, the specific operation parts being a part of a plurality of operation parts on the HMI screen,
• the server processor is configured to execute the web server, the web server being capable of transmitting the image data, the screen operation authority information, and the exception information to the web browser,
• the HMI client apparatus includes a client processor, a client memory, and a monitor,
• the client memory stores the image data, the screen operation authority information, and the exception information received from the web server,
• the client processor is configured to execute the web browser displayed on the monitor, and
• the client processor is configured to execute screen drawing processing based on a determination of whether each of the specific operation parts is included in the exception information and, upon determining that a specific operation part is included in the exception information, operation permission/prohibition defined in the exception information is preferentially applied to the specific operation part by disregarding operation permission/prohibition defined on the HMI screen, and operation permission/prohibition defined in the screen operation authority information is applied to each operation part other than the specific operation part among the plurality of operation parts on the HMI screen, and the HMI screen is drawn in the web browser.