Which term describes technology designed to implement an industrial control system rather than business IT networks?

• A. Operational Technology (OT)
• B. Industrial Control System (ICS)
• C. Fieldbus
• D. Programmable Logic Controller (PLC)

Answer: (A)

The main idea here is distinguishing the technology that controls physical processes from general business IT. Operational Technology describes the hardware and software used to monitor and control industrial activities—systems that directly affect the physical world, such as manufacturing lines, power grids, or water treatment plants. This kind of technology is built to run industrial control systems with real-time requirements, safety, and reliability in mind, and it often sits on separate networks or tightly segmented connections from typical business IT.

Industrial Control System is the broader term for the collection of control components and software that manage an industrial process. Fieldbus refers to a specific way field devices communicate, and a Programmable Logic Controller is a device that executes control logic within an OT environment. None of these alone capture the overarching category, which is why Operational Technology is the best fit.