A PLC system consists of a power supply, processor, and various _____.

A PLC system consists of a power supply, processor, and various _____.

• A. Modules
• B. Boards
• C. Subsystems
• D. Units

Answer: (A)

A PLC is built around modular components: a processor handles the control program, a power supply provides the operating voltage, and plug-in modules deliver the input and output capabilities and other functions the system needs. These modules can be digital I/O, analog I/O, or communication and special-purpose modules, all designed to snap into the PLC chassis and connect to the processor. This modular approach lets you tailor the system to the application by adding only the needed I/O and features. The term modules is the standard way to describe these plug-in units, rather than boards, subsystems, or units, which are less specific to the PLC’s architecture.

A PLC is built around modular components: a processor handles the control program, a power supply provides the operating voltage, and plug-in modules deliver the input and output capabilities and other functions the system needs. These modules can be digital I/O, analog I/O, or communication and special-purpose modules, all designed to snap into the PLC chassis and connect to the processor. This modular approach lets you tailor the system to the application by adding only the needed I/O and features. The term modules is the standard way to describe these plug-in units, rather than boards, subsystems, or units, which are less specific to the PLC’s architecture.