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Safety Instrumented System (SIS)

Abbreviation(s) and Synonym(s):

SIS

Definition(s):

  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. Other terms commonly used include emergency shutdown system (ESS), safety shutdown system (SSD), and safety interlock system (SIS).
Source(s):
NIST SP 800-82 Rev. 2 ANSI/ISA-84.00.01