How is the achieved performance level (PL) assessed?
An estimate of the performance level (PL) attained must be carried out for every safety-related component of a control system. The following aspects need to be determined: MTTF value for individual components (mean time to failure resulting in hazard); DC (diagnostic coverage); CCF (estimate of common cause failures); Structure; Behaviour of safety function under malfunction conditions; Safety-related software; Systematic failures; Ability to execute a safety function under foreseeable ambient conditions.
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