A PID controller is a widely used feedback control system that automatically adjusts the input to keep the output close to a desired value called the set point. It continuously measures the error, which is the difference between the set point and the actual output, and processes it using three control actions. The Proportional (P) term reacts to the present error. Increasing the proportional gain makes the system respond faster, but too much gain can cause oscillations and overshoot. The Integral (I) term adds up past errors over time. It eliminates steady-state error and helps the output reach the exact set point. However, excessive integral action may slow the response and increase overshoot. The Derivative (D) term predicts future error by measuring how quickly the error changes. It improves stability, reduces oscillations, and minimizes overshoot. The graph compares system performance with and without PID control. Without PID, the response oscillates and takes longer to settle. With PID, the system reaches the desired value faster, with less overshoot and better stability. PID controllers are commonly used in motor drives, temperature control, robotics, process industries, and automation systems. Post navigation Function Blocks (FBs) and Data Blocks (DBs)
