IEC 61508 covers the complete safety life cycle of electrical/electronic/programmable electronic (E/E/PE) safety related systems. ISO 26262 Road Vehicles-Functional Safety.IEC 61511 Safety Instrumented Systems for the Process Industry Sector.Examples of how industry groups have applied the concepts of IEC 61508 and included specific additions to make them more relevant include the following: The base generic specification, IEC 61508, is intended for applications in a variety of industries. Exida, a certifying agency for functional safety, states, “The goal of functional safety is to design an automatic safety function that will perform the intended function correctly or the system will fail in a predictable (safe) manner.” Performing the intended function is based on the reliability of the system, and failing in a predictable manner is based on the safety design of the system.įortunately, international standards have been published to apply consistent and proven methods to systems requiring functional safety. The level of safety is achieved by avoiding or controlling faults. The International Electrotechnical Commission (IEC) defines functional safety in the IEC 61508-0: 3.1 standard as “part of the overall safety that depends on a system or equipment operating correctly in response to its inputs.” In the article “ IEC 61508 Explained,” the IEC further states, “Functional safety is the detection of a potentially dangerous condition resulting in the activation of a protective or corrective device or mechanism to prevent hazardous events arising or providing mitigation to reduce the consequence of the hazardous event.”Ī defined life cycle addresses the analysis, design, installation, operation, and maintenance of equipment.
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