List of abbreviations/acronyms
B.2 Functional safety
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
247
SIL Safety Integrity Level The international standard IEC 61508 defines four discrete
Safety Integrity Levels (SIL 1 to SIL 4). Each level corresponds
to a range of probability for failure of a safety function. The
higher the Safety Integrity Level of the safety-instrumented
system, the lower the probability that it will not execute the
required safety functions.
SIS Safety Instrumented System A safety-instrumented system (SIS) executes the safety
functions that are required to achieve or maintain a safe status
in a system. It consists of a sensor, logic unit/control system
and final controlling element.
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