Key Differences Between PID and Interlock
PID (Proportional-Integral-Derivative) controllers modulate process variables (like speed or temperature) continuously to maintain a setpoint. Conversely, an Interlock is a binary (on/off) safety system that forces equipment to stop or prevent start-up if dangerous conditions exist. PID regulates; interlocks protect. Key Differences Between PID and Interlock Function: PID: Provides continuous, proportional control to keep a process variable close to a setpoint (e.g., maintaining 500 RPM). Interlock: Provides discrete, binary action (e.g., stop pump if pressure is \(>100\) PSI). Action Type: PID: Analog/Modulating (adjusts output from 0–100%). Interlock: Digital/Binary (On/Off, True/False). Operating Objective: PID: Efficiency, stability, and process regulation. Interlock: Safety, equipment protection, and hazard prevention. Typical Application: PID: Heater temperature control, flow rate regulation, speed control. Interlock: Emergency Shutdown (ESD) systems, preventing p...