Which of the following is the heart of a SCADA system?

The correct answer is: A. PLC

A PLC (programmable logic controller) is a digital computer used for automation of industrial processes, such as in manufacturing, oil and gas, water and wastewater treatment, etc. PLCs are used to control and monitor a variety of devices, such as motors, valves, sensors, and alarms.

A HMI (human-machine interface) is a computer-based system that allows operators to interact with a PLC. HMIs typically provide a graphical user interface (GUI) that allows operators to view process data, send commands to the PLC, and receive alarms.

An alarm task is a software program that monitors the PLC for alarms. When an alarm occurs, the

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