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13 Terms and abbreviations
Cat. Classification of the safety-related parts of a controller
as regards their resistance to failures.
CCF Common Cause Failure
DC Diagnostic Coverage
MTTF Mean Time to Failure
MTTF
D
Mean Time To Dangerous Failure
PFH
(PFH
D
)
Probability of (dangerous) Failure per Hour
PL Performance Level PL to ISO 13849-1
SIL Safety Integrity Level SIL 1-4 to IEC 61508
PLC Programmable Logic Controller
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