A PLC typically consists of which elements?

A PLC, or Programmable Logic Controller, is a versatile device used in automation and control systems, and it typically consists of both inputs and outputs. Inputs are necessary for the PLC to receive signals from various sensors, switches, and other devices that provide data about the current state of a process or system. The PLC processes this data based on predefined logic or programming.

Outputs, on the other hand, are essential for the PLC to send commands to control devices such as motors, lights, actuators, or other machinery based on the processed input signals. This input/output relationship enables the PLC to interact with the external environment, making it a critical component for automated systems.

The other options do not accurately represent the complete functionality of a PLC. Typically, a PLC cannot function solely with outputs or inputs; it requires both to perform its role effectively in automation. Therefore, the inclusion of both inputs and outputs is fundamental to the PLC’s design and operation.