Top failures with missing S rating

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Top failures with missing S rating

Explanation:

A search will be performed for top failures which have no S rating assigned

Anmerkung:

  • Top failures (TF) are failures which have causes but no effects.

Example:


Abbreviations
  • ASIL = Automotive safety integrity level
  • BF = Base failure of a base function
  • BFn = Base function of a base structure element
  • BSE = Base structure element
  • Cl Prc = Classification for process characteristic
  • Cl Prd = Classification for product characteristic
  • Cl Req = Classification for requirement
  • CM = Control method
  • DA = Detection action
  • DC = Diagnostic coverage
  • DSCF = Dangerous safety critical failure
  • Er Det = Error detection
  • Er Resp = Error response
  • F = Failure
  • FIT = Failure in time
  • Fn = Function
  • FSM = Functional safety management
  • IE = Inspection equipment
  • LF = Latent fault
  • LFM = Latent fault metric
  • OC = Operating condition
  • PA = Preventive action
  • PE = Process element
  • PFH = Probability of failure per Hour
  • PMHF = Probabilistic metric for random hardware failures
  • PrcC = Process characteristic
  • PrdC = Product characteristic
  • QM = Quality method
  • QR = Quality rule
  • Req = Requirement
  • RMR = Risk Matrix Ranking
  • RP = Reaction plan
  • SE = Structure element
  • SE ErDet = Structure element for error detections
  • SE ErResp = Structure element for error responses
  • SFF = Safe failure fraction
  • SG = Safety Goal
  • SIL = Safety integrity level
  • SM = Organisational-SE for “safety mechanisms”
  • SPF = Single point fault
  • SPFM = Single point fault metric
  • TF = Top failure of a top function
  • TFn = Top function at root element
  • TS = Test sample


075_SE

  • TF1, TF2 and TF3 are three top failures (TF) anchored at the root element in the above structure. You can recognize a TF with the hot-click icon Failure net right.
  • With the structure-list display option “Severity” active, it is possible to see which failures have been assigned an S rating.
  • There is a further TF to be found at SE1 A, “F1”. You can see in the following images (Graph Editor & Failure Net Editor) how the failures are linked with each other.
  • TF4 is not a TF, even if the name suggests it. TF4 is actually an unlinked single failure, which has neither effects nor causes. Unlinked failures can be identified with the hot-click icon Failure net unfilled.

Graph Editor:

075_Graph

Failure Net Editor from viewpoint of TF:

075_Failures

Search result: Search results

By either viewing the Graph Editor or Failure Net Editor, with the display option “Severity” active, you can see which top failures don’t have S ratings assigned: TF1 and F1 are both hits in this Quality Rule search.

Download QR example