Search:
Base failures without actions
Explanation:
A search for base failures will be performed that have no actions assigned (neither preventive nor detection).
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 seven 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 structure also contains four preventive actions (PA; Hot-click icon
) and five detection actins (DA, Hot-click icon 
) defined at certain failures.
Graph Editor:
Failure Net Editor (failure net from viewpoint of BF):
With “Actions” activated in the Failure Net Editor Display options it is possible to see where all preventive- and detection actions are in the failure net.
Search result: 
In this example, two failures will be found that have neither preventive- nor detection actions assigned and are also base failures. These are BF6 and BF9.