User Manual

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Start a new FMEA

Right click on the SBlock element shown in "Model Explorer" and select "ESF Analysis Tools > ESF FMEA > Start a new FMEA".

Start a new FMEA

In the SSafetyArtifacts element, three nested elements are created:

FMEA Elements Created

FMEA Table

Double click on a FMEATable to open it.

FMEA Table

List of the fields of the FMEA Table:

Field Description
Name Failure mode name/identification.
Description Failure mode description.
Causes Identification of one or more causes that trigger a process (mechanism) that leads to a failure mode.
Local Effects List of the failure effects applied to the item (SBlock) under analysis.
System Effects List of the failure effects at the global system level.
Customer Effects Level of severity for the worst case unfavourable to the end (system) effect. This level is defined at the beginning of analysis.
Initial Severity Level of severity for the worst case unfavourable to the end (system) effect. This level is defined at the beginning of analysis.
Initial Occurrence Estimation of the probability of the frequency of the failure mode. This estimation is defined at the beginning of analysis.
Is Detectable Define if there is at least one way to detect the failure mode.
Initial Detectability Estimation of the means or the method by which a failure is detected. This estimation is defined at the beginning of analysis.
Initial Criticality Measure used for risk assessment of failure modes. Its value is automatically calculated: Initial Severity x Initial Occurrence or, if it is detectable, Initial Severity x Initial Occurrence x Final Detectability. This estimation is defined at the beginning of analysis.
Initial Preventive Actions Additional information in relation to the measures used to reduce the risk or to justify a level of risk or the proposed scenario. This information is defined at the beginning of analysis.
Final Severity Level of severity for the worst case unfavourable to the end (system) effect. This level is updated if necessary with each analysis.
Final Occurrence Estimation of the probability of the frequency of the failure mode. This level is updated if necessary with each analysis. This estimation is defined at the beginning of analysis.
Final Detectability Estimation of the means or the method by which a failure is detected. This level is updated if necessary with each analysis.
Final Criticality Measure used for risk assessment of failure modes. Its value is automatically calculated: Initial Severity x Initial Occurrence or, if it is detectable, Initial Severity x Initial Occurrence x Final Detectability. This level is updated if necessary with each analysis.
Final Preventive Actions Additional information in relation to the measures used to reduce the risk or to justify a level of risk or the proposed scenario. This field is updated if necessary with each analysis.

For add a new failure mode there is two ways:

First way it is directly on a FMEA Table. Right click and select "ESF Analysis Tools > ESF FMEA > Create a new Failure Mode".

Add New Failure Mode By FMEA Table

Second way it is directly on a SBlock shown in "Model Explorer". Right click and select "ESF Analysis Tools > ESF FMEA > Create a new Failure Mode".

Add New Failure Mode By Model Explorer

There is a synchronization between the model and the FMEA Tables. The result of actions of "add" and "remove" a failure mode is reflected on both sides.

Synchronization Model and Table - Add Failure Mode

The field "Initial/Final Criticality" is automatically calculated: Initial/Final Severity x Initial/Final Occurrence.

Criticality Calculate - Not Detectable

If the field "Is Detectable" is marked, the value of "Initial/Final Detectability" is considered in the calculate.

Criticality Calculate - Detectable