SCADA web HMI system

An HMI server apparatus of Supervisory Control And Data Acquisition (SCADA) web Human Machine Interface (HMI) system comprising:

• circuitry configured to perform, to reduce processing load on the server processing circuit:
• reception processing to periodically receive block data transmitted from a Programmable Logic Controller (PLC), the PLC transmitting, to a computer network of the SCADA web HMI system, block data including a set of input/output signals relating to field apparatuses configuring an industrial plant, the SCADA web HMI system including an HMI client apparatus that includes a monitor displaying a web browser, and a client processing circuit configured to execute the web browser displaying a screen including arranged display parts, and the client processing circuit controlling the web browser to change display states of the display parts based on the input/output signals received from the HMI server apparatus, in a case where the screen currently displayed on the web browser is a supervisory screen;
• first filtering processing to extract, in a case where the received block data corresponds to the screen currently displayed on the web browser, the set of input/output signals from the received block data;
• second filtering processing to extract the input/output signals each having a value varied from a previous value, from the set of input/output signals extracted in the first filtering processing;
• third filtering processing to extract the input/output signals corresponding to the display parts arranged in the screen currently displayed on the web browser, from the input/output signals extracted in the second filtering processing;
• and
• transmission processing to transmit the input/output signals extracted in the third filtering processing, to the web browser displayed on the monitor, the input/output signals extracted in the third filtering processing being target data for real time monitoring by the supervisory screen on the web browser displayed by the monitor of the HMI client apparatus.

A method for HMI server apparatus of Supervisory Control And Data Acquisition (SCADA) web Human Machine Interface (HMI) system comprising:

• periodically receiving block data transmitted from a Programmable Logic Controller (PLC), the PLC transmitting, to a computer network of the SCADA web HMI system, block data including a set of input/output signals relating to field apparatuses configuring an industrial plant, the SCADA web HMI system including an HMI client apparatus that includes a monitor displaying a web browser, and a client processing circuit configured to execute the web browser displaying a screen including arranged display parts, and the client processing circuit controlling the web browser to change display states of the display parts based on the input/output signals received from the HMI server apparatus, in a case where the screen currently displayed on the web browser is a supervisory screen;
• performing a first filtering process to extract, in a case where the received block data corresponds to the screen currently displayed on the web browser, the set of input/output signals from the received block data;
• performing a second filtering processing to extract the input/output signals each having a value varied from a previous value, from the set of input/output signals extracted in the first filtering processing;
• performing a third filtering processing to extract the input/output signals corresponding to the display parts arranged in the screen currently displayed on the web browser, from the input/output signals extracted in the second filtering processing;
• and
• transmitting the input/output signals extracted in the third filtering processing, to the web browser displayed on the monitor, the input/output signals extracted in the third filtering processing being target data for real time monitoring by the supervisory screen on the web browser displayed by the monitor of the HMI client apparatus.