Which system is intended to supervise large-scale industrial control systems across multiple sites by replacing the control server?

The system designed to supervise large-scale industrial control systems across multiple sites by replacing the control server is SCADA (Supervisory Control and Data Acquisition). SCADA systems are crucial in industrial environments because they provide centralized monitoring and control of various processes, often spanning vast geographical distances.

SCADA systems enable operators to gather real-time data, control equipment remotely, and visualize complex process operations through user interfaces. They are particularly beneficial for industries like utilities, manufacturing, and transportation, where continuous monitoring and rapid response to issues are essential. By leveraging multiple data acquisition points and control elements, SCADA systems surpass traditional control servers, allowing for a more integrated and efficient management of operations.

In comparison, Distributed Control Systems (DCS) focus primarily on local control within a single site and do not typically manage multiple locations in the same way that SCADA does. Industrial Control Systems (ICS) is a broader term encompassing both SCADA and DCS, so it lacks the specificity needed to identify the supervisory aspect across multiple sites. Programmable Logic Controllers (PLCs) are hardware used for automation in machinery and controls; while they can be part of a SCADA system, they do not serve the supervisory function across large-scale environments.