Safety Lifecycle

Phases from concept through decommissioning per IEC 61508. This concept is fundamental to modern industrial automation and represents an important aspect of safety systems. Understanding this term is crucial for professionals working with PLCs and industrial control systems.

Safety engineering is unforgiving, and Safety Lifecycle is part of the structured approach to making industrial machinery safe. Phases from concept through decommissioning per IEC 61508.

In a safety-rated installation, Safety Lifecycle typically lives in a hardwired path independent of the standard PLC scan cycle, because Category 0 and Category 1 stops per IEC 60204-1 require fail-safe behaviour that doesn't depend on software running correctly. The standard PLC may observe the safety state for HMI and alarm purposes, but the physical stop path is electromechanical or runs on certified safety hardware.

Insurance, OSHA inspectors, and machinery-directive auditors all expect Safety Lifecycle to be addressed by both engineering and paperwork. The two combined are the safety case; either alone is insufficient.