Incorrectly linked failures from base elements

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Incorrectly linked failures from base elements

Explanation:

A search will be performed for failures anchored at base elements which are linked to failures in the direction of causes within the same structure.
Note: structure-spanning failure net links will not be considered in this search.

Note:

  • A base element is a structure element, which has no further structure elements in direction of causes (i.e. to the right)

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


069-SE

  • This structure consists of four system elements (system element), each of which have a different amount of failures (failure) assigned. Of these four system elements; BSE1 and SE2 are base elements, as these two structure elements have no further system elements in the direction of causes.
  • With the display option hot-click icon “Failure net” active, it is possible to see how the failures are linked in the failure net.
  • When a failure is linked in the direction of causes in a failure net, the hot-click icon will be either (failure net both) or (Failure net right). Failures of base elements with these icons will be identified in this Quality Rule.

Search result: Search results

There are two failures at base element SE2, which are linked to further failures in direction of causes. These are F3 and F4.

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