Which system enables control over multiple-site devices from a central location?

The choice of Supervisory Control and Data Acquisition (SCADA) is accurate because SCADA systems are specifically designed for the centralized monitoring and control of various industrial processes and infrastructure across multiple sites. These systems collect real-time data from sensors and equipment located in different geographical locations, allowing operators to monitor performance, analyze trends, and make informed decisions from a single central interface.

SCADA systems are widely utilized in sectors such as energy, water treatment, transportation, and manufacturing, where control over large-scale and dispersed devices is critical. They facilitate the automation of processes and enable efficient management of resources, reducing the need for manual oversight and improving response times in emergency situations.

In contrast, Fieldbus refers to a network system used to connect sensors and actuators in industrial environments, but it does not inherently provide centralized control capabilities over multiple sites. A Data Historian is a type of database used to log and analyze operational data, but it does not control systems directly. Operational Technology (OT) encompasses various hardware and software solutions used to detect or control physical devices, but it does not specifically indicate centralized control over multiple sites in the same way SCADA does. Thus, SCADA is the most fitting choice for the question regarding centralized control over multiple-site devices.