The objective is to specify the requirements for the safety instrumented functions.

  • To define the safe state of the process for each identified safety instrumented function;

  • The assumed sources of demand and demand rate on the safety instrumented function;

  • Requirement for proof-test intervals;

  • Response time requirement for the sis to bring the process to a safe state;

  • The safety integrity level and mode of operation(demand/continuous) for each safety instrumented function;

  • A description of SIS process measurements and their trip points;

  • Requirements relating to energize or de-energize to trip;

  • Requirement for resetting the SIS after a shutdown.

  • Maximum allowable spurious trip rate ; as per IEC 61511.

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