Definition Edit

A Safety Instrumented System (SIS) (also called emergency shutdown system (ESS), safety shutdown system (SSD), and safety interlock system (SIS)) is

[a] system that is composed of sensors, logic solvers, and final control elements whose purpose is to take the process to a safe state when predetermined conditions are violated.[1]

References Edit

  1. NIST Special Publication 800-82, at B-7.

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