Safety Requirement Specification, SRS, is a documentation for requirements stated in the safety standards
e.g. the standard IEC61511 “Functional safety – Safety instrumented systems for the process industry sector”. A SRS must be developed during a project that involves Safety Instrumented Systems, SIS.
IEC 61511 specifies the general requirements for the SRS. These requirements serve as a reference to achieve functional safety for the SIS.
The SRS set-up is one of the most important activities during the life-cycle since it collects all important information necessary to design and build functional safety in process applications.
Most companies must develop their own format of SRS, this document provides a simple guideline on how to write a SRS.