IEC 61508 / 61511 Functional Safety

The standards governing the safety-instrumented system and its integrity level.

Governs

Safety interlocks (SIL)

IEC 61508 and 61511 govern functional safety — the design and verification of safety-instrumented systems to a defined safety-integrity level. They apply to the interlocks that protect a fusion machine, and their verification is a scheduled qualification task.

Kronos sets SIL targets for its protective systems and treats verification as gate work.