7. Glossary
DC ( Diagnostic Coverage )
Proportion of dangerous failures detected in relation to all dangerous failures.
LOPA
Layer Of Protection Analysis.
MooN
Structure for which a safety function is guaranteed when M out of N devices are in a condition to perform their function.
MTTR ( Mean Time To Repair )
Average time taken to repair a system.
SIL level
A discrete level (of four possible) for specifying the safety integrity requirements of the safety functions to be allocated to safety-related E/E/PE systems. Safety integrity level 4 has the highest degree of integrity; level 1 has the lowest.
Test period
Time between two tests...
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