Safety Requirements Specification

The objective of SRS is to specify the requirements for the SIS, including any application programs and the architecture of the SIS.

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For IEC61511, SRS is normative requirement
The objective of SRS is to specify the requirements for the SIS, including any application programs and the architecture of the SIS.
The aim of SRS is to have every SIF described in such a way that anyone wherever and whenever need to understand the SIF;

The safety requirements shall be derived from the allocation of SIF and from those requirements identified during H&RA. The SIS requirements shall be expressed and structured in such a way that they are

  • clear, precise, verifiable, maintainable and feasible;
  • written to aid comprehension and interpretation by those who will utilise the information at any phase of the safety life-cycle.

The purpose of SRS is to define the functional and performance requirements for the Safety Instrumented Functions (SIF)

The content of the Safety Requirement Specification will be as listed and required in IEC 61511 clause 10.3 [16].

The scope of this SRS includes:

  • Give a description of all necessary safety instrumented functions required to achieve risk reduction as determined by the SIL assessment.
  • State the integrity level for each safety instrumented function.
  • Give a definition of safe state for each of the identified safety instrumented functions.
  • State requirements for proof test intervals.

The SRS is subject to various revisions as further SIL assessments are carried out and detailed design progresses.

For more information and Request of Proposal of Functional Safety Management, contact MYND staff over info@myndservices.com