.. _fsd212:

FSD212: Derivation of Safe Failure Fraction
###########################################

.. list-table:: Header
   :header-rows: 0

   * - Title
     - FSD212-Derivation SFF
   * - Products
     - Safety Simplifier
   * - Requirements
     - EN 61508-2:2010, clause 7.4
   * - Purpose
     - Derive Safe Failure Fraction
   * - Input
     - EN 61508-2:2010, table A.1-A.15
   * - Output
     - Estimates

Table of contents
*****************

.. contents::

EN 61508-2:2010, Table A.1 to A.15
**********************************

Faults or failures to be assumed when quantifying the effect of random hardware failures or to be taken into account in the derivation of safe failure fraction

.. motivation:: SFF>99%
   :id: MOTIVATION_212_001
   :tags: FSD212
   :status: PASS

   Safety Simplifier has a SFF>99%. See table in :ref:`FSD212` (this document).


.. csv-table:: 61508-2, table A.1-A.15
   :file: ../resources/tables/2_mot_table_a_1_15.csv
   :widths: 15 15 15 15 15 35
   :header-rows: 1


Revision History
****************

.. list-table::
   :header-rows: 0

   * - Date
     - By
     - Version
     - Description

   * - 2017-11-09
     - Jesper Ribbe
     - V01
     - Initial version

   * - 2025-07-23
     - Jesper Ribbe
     - V02
     - Reviewed and updated for v2.0.0 of software and PCB018K HW