Functional Safety Standard
An international regulatory framework governs the design and operation of electrical and programmable electronic safety related systems. Compliance with iec 61508 requires a rigorous assessment of both systematic and random hardware failures throughout the entire product life. The document establishes requirements for every phase from initial concept through to final decommissioning and disposal.
Safety Integrity Level
Risks are categorized into four distinct performance tiers based on the probability of failure on demand. A device meeting iec 61508 criteria receives a rating that determines its suitability for high risk industrial processes. Higher levels demand greater diagnostic coverage and more frequent proof testing to maintain the safety function.
Diagnostic Hardware Coverage
Internal monitoring circuits detect faults before they lead to a dangerous state. Engineers calculating the safe failure fraction for iec 61508 must account for every component in the signal path. Resilient designs often include redundant sensors or voting logic to satisfy these stringent reliability targets.
Certification Process
Verification involves a detailed audit of the development lifecycle and the quality management system. An independent body usually issues the certificate after reviewing the safety manual and the failure modes effect analysis. Holding an iec 61508 approval allows a manufacturer to supply components for critical infrastructure projects.
