SCADA web HMI client device and SCADA web HMI system

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

• an HMI server device configured to execute a web server;
• and
• an HMI client device configured to execute at least one web browser communicating with the web server, wherein
• the HMI server device includes a server processor and a server memory,
• the server memory stores login information, image data for an HMI screen for supervising an industrial plant, and screen access authority information, the login information including a user access level corresponding to a login username, the screen access authority information including an operation access level of the HMI screen and operation permission/prohibition of the HMI screen by the web browser,
• the server processor is configured to execute the web server that transmits the user access level corresponding to the login username, the image data, and the screen access authority information to the web browser, in response to a login request including the login username from the web browser,
• the HMI client device includes a client processor, a client memory, and a monitor,
• the client memory stores the user access level corresponding to the login user, the image data, and the screen access authority information, all received from the web server, and
• the client processor is configured to execute the web browser displayed on the monitor,
• the client processor is configured to draw the HMI screen in an operable state on the web browser in a case where the user access level is greater than or equal to the operation access level of the HMI screen and where operation of the HMI screen by the web browser is permitted, and
• the client processor is configured to draw the HMI screen in an inoperable state on the web browser in a case where the user access level is less than the operation access level of the HMI screen or operation of the HMI screen by the web browser is not permitted.