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104595 Datasheet(PDF) 41 Page - PHOENIX CONTACT |
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104595 Datasheet(HTML) 41 Page - PHOENIX CONTACT |
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41 / 41 page  Appendix - Safety-related applications (SIL 2) en Version 04 A-7 PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany www.phoenixcontact.com A1.9 Abbreviations Abbreviation Meaning DC D Diagnostic Cov- erage of Dan- gerous Failures Diagnostic coverage: DC D = λDD/(λDU + λDD) HFT Hardware Fault Tolerance Hardware Fault Tolerance: Ability of a function unit to con- tinue with the execution of a de- manded function despite exist- ing failures or deviations λ D Rate of Danger- ous Failures Proportion of dangerous fail- ures per hour λ DD Rate of Danger- ous Detected Failures Proportion of detected danger- ous failures per hour λ DU Rate of Danger- ous Undetected Failures Proportion of undetected dan- gerous failures per hour λ S Rate of Safe Failures Proportion of safe failures per hour MTBF Mean Time Between Failures Mean time between consecu- tive failures PFD avg Average Probability of Failure on Demand Average probability of failure on demand of a safety function PFH Probability of a Dangerous Failure per Hour Probability of failure per hour for the safety function SFF Safe Failure Fraction Proportion of safe failures: Pro- portion of failures without the potential to set the safety-re- lated system to a dangerous or impermissible function state SIL Safety Integrity Level International standard IEC 61508 defines four discrete safety integrity levels (SIL 1 to 4). Each level corresponds to a probability range for the failure of a safety function. The higher the safety integrity level of safety-related systems, the lower the probability that the demanded safety functions will not be performed. |
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