Visual explanation of the 1oo2 (one-out-of-two) safety architecture
IEC 61511: 1oo2 Architecture Explained 1oo2 Architecture Explained A visual guide to the “One-out-of-Two” voting logic in Safety Instrumented Systems (IEC 61511). Interactive System Diagram Sensor A Sensor B Logic Solver (1oo2) Trips if A OR B detects hazard Final Element VALVE OPEN Normal Operation Hazard (Sensor A) Hazard (Sensor B) Spurious Trip (A) How […]
Understanding Probability of Failure on Demand (PFD)
PFD & SIL Visualizer (IEC 61511) Understanding Probability of Failure on Demand (PFD) An Interactive Visual Guide based on IEC 61511 for Low Demand Mode What is PFD? Probability of Failure on Demand (PFD) is a measure of the reliability of a safety function. It represents the likelihood that a safety system (like an emergency […]