Which element of both PC and PLC architectures handles processing tasks?

• A. Processor
• B. Memory
• C. Expansion slots
• D. Motherboard

Answer: (A)

The processor is the component that handles processing tasks in both PC and PLC architectures. In a PC, the CPU executes instructions by fetching them from memory, decoding them, and performing the required operations, effectively driving software, calculations, and data flow. In a PLC, the CPU runs the control program, reads inputs, processes logic and timing, and updates the outputs to control machinery in real time. Memory stores the instructions and data, while expansion slots add hardware and the motherboard provides the platform for connections. But processing work itself is done by the processor, making it the correct choice.