OCL Derived Property of a Safety Goal: how to distinguish between transient and permanent faults

medini_1019619963

In a project with more DC Worksheets we use a following derived property of a Safety Goal to calculate total safety related FIT:

let
worksheets : Set(dc::DCWorksheet) = dc::DCWorksheet.allInstances()->select(dc | dc.safetyGoal.oclAsType(safetygoals::SafetyGoal)->includes(self) and dc.getProfilePropertyValue('use_for_metrics')->first() <> 'no'),
 totalSafetyRelated : Real = worksheets->iterate(sheet : dc::DCWorksheet; sum:Real=0 | sum + sheet.getTotalSafetyRelatedFailureRate(self))
in
if (totalSafetyRelated = 0) then
 '-'
else
 --display sum of single-point and residual fault
 (((1000*totalSafetyRelated).round())/1000).toString()
endif

How should we modify this line:

 totalSafetyRelated : Real = worksheets->iterate(sheet : dc::DCWorksheet; sum:Real=0 | sum + sheet.getTotalSafetyRelatedFailureRate(self))

to aggregate FIT rates of permanent or transient faults only?

medini_1024169437

Hello Arek,

the function "DCWorksheet.getTotalSafetyRelatedFailureRate" returns the metric just for the permanent faults while "DCWorksheet.getTotalSafetyRelatedTransientFailureRate" returns the metric just for the transient faults. Hope that answers the question.

Happy Scripting

Jan