Which PLC component provides the electrical power to all components?

Which PLC component provides the electrical power to all components?

• A. Processor
• B. Input assembly
• C. Output assembly
• D. Power supply

Answer: (D)

The function being tested is about identifying the part that supplies the PLC system with electrical power. The power supply is the source that converts the incoming electrical energy (from AC mains or another source) into the proper low-voltage DC rails the PLC and its modules need, such as 24V DC. It powers the processor, input modules, and output modules, and without it nothing in the PLC can run. The processor is the brain that executes logic, but it relies on the power supply for its energy. The input assembly and output assembly are interfaces to sensors and actuators; they carry signals to and from the processor, but they do not generate or provide the main power to the system.

The function being tested is about identifying the part that supplies the PLC system with electrical power. The power supply is the source that converts the incoming electrical energy (from AC mains or another source) into the proper low-voltage DC rails the PLC and its modules need, such as 24V DC. It powers the processor, input modules, and output modules, and without it nothing in the PLC can run.

The processor is the brain that executes logic, but it relies on the power supply for its energy. The input assembly and output assembly are interfaces to sensors and actuators; they carry signals to and from the processor, but they do not generate or provide the main power to the system.