Industrial Maintenance Technician Practice Test 2025 - Free Maintenance Technician Practice Questions and Study Guide

The two basic sections of a Programmable Logic Controller (PLC) are the central processing unit (CPU) and the input/output (I/O) system. The CPU is the brain of the PLC, responsible for executing control instructions, processing data, and coordinating the operation of the various components. It processes the information received from input devices and executes the programmed logic to produce the appropriate outputs.

The input/output system is essential for interacting with the external environment. Input modules receive signals from input devices such as sensors and switches, while output modules send signals to actuators and devices that perform actions based on the CPU's processed commands. The combination of the CPU and the I/O system allows the PLC to function effectively in automating processes and controlling machinery.

Other options may refer to components related to PLC operation but do not correctly identify the two fundamental sections. For instance, references to input modules and output circuits address specific parts of the I/O system but do not encompass the entire structure of the PLC. Similarly, memory storage and user interface, while important, do not represent the primary function or architecture of a PLC.