Search:
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
- This structure consists of four system elements (
), each of which have a different
amount of failures (
) 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 (
) or (
).
Failures of base elements with these icons will be identified in this Quality Rule.
Search result: 
There are two failures at base element SE2, which are linked to further failures in direction of causes. These are F3 and F4.