Red Seal Instrumentation and Control Technician Practice Exam

What role does a PLC serve in industrial automation?

1. It manages data storage

2. It automates processes by controlling outputs based on programmed logic

3. It analyzes market trends

4. It repairs equipment automatically

The correct answer is: It automates processes by controlling outputs based on programmed logic

A Programmable Logic Controller (PLC) serves a crucial role in industrial automation by automating processes through the control of outputs based on programmed logic. PLCs are designed to handle complex control tasks in real-time environments. They take input signals from various sensors, process this information according to a user-defined program, and then trigger specific outputs, such as activating motors, valves, or alarms. This function allows for the efficient management of production processes, ensuring that operations run smoothly and safely. The ability to create and modify the logic within a PLC allows for flexibility in production processes, as changes can be made without needing to physically alter the hardware. This adaptability is essential for responding to varying production needs or changes in operational requirements. This intrinsic capability to execute programmed instructions dynamically differentiates PLCs from other data management or analysis systems, which perform entirely separate functions not directly related to process control.