Search:
Base failures at inner structure elements
Explanations:
A search will be performed for base failures anchored at structure elements, which have at least one further structure element “to its right”.
Note:
Base failures (BF) are failures which have effects but no causes.
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
- The above structure contains six base failures (BF) which can be recognized with the hot-click icon
. This icon (check display options if not visible in IQ-Software) indicates that the failure is connected to at least a further failure (in direction of effects) but has no failures in direction of causes. This can be seen more clearly in the image below (of the failure net) whereby the BF is found on the far right of the net and therefore has no causes. - The Graphics window shows the arrangement of the structure elements (SE). Ignoring the root element, base failures can be found at SE1 A, SE1 B, and SE2 B that can be detected using this Quality Rule.
Failure Net Editor (failure net from viewpoint of BF):
Search result: 
In this example, three failures will be found which are base failures and which have at least one structure element to its right in the tree. These are BF2, BF4 and BF5.