Most used Architectures In the following table we show the most used architectures when designing Safety Instrumented Functions (SIF). Logic Channels1 HFT (S) HFT (A) Objetives Used for 1001 1 0 0   sensor, actuator 1002 2 1 0 More Safety sensor, actuator 2002

Safety Instrumented Function The Safety Instrumented Function, whose abbreviation is SIF, is a protection layer whose objective is to achieve or maintain a safe state of the process when a specific dangerous event occurs. The SIF is implemented in the SIS (Safety Instrumented System) which