Which component is described as a physical hardware assembly that houses devices such as I/O modules, processor models, and power supplies?

• A. Chassis
• B. Memory module
• C. Interface board
• D. Display panel

Answer: (A)

In PLC hardware, the component that acts as the physical frame housing I/O modules, CPU/processor modules, and power supplies is the chassis. It provides the enclosure and backplane that hold and connect all the modular cards, offers mechanical support, and distributes power to each module. This modular setup lets you customize the system by adding or removing cards as needed.

A memory module is a standalone board that provides data storage, not the main housing. An interface board adds communication capability but isn’t the enclosure for all components. A display panel is the human-machine interface used for operator interaction, separate from the internal hardware housing.