Yokogawa RAKD - Manual (Page 66)

<A1. SAFETY INSTRUMENTED SYSTEMS INSTALLATION>
A1-4
IM 01R01B30-00E-E 5th edition February 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
A1.3 Definitions and Abbreviations
A1.3.1 Definitions
Safety Freedom from unacceptable risk of harm
Functional Safety The ability of a system to carry out the actions necessary to achieve or to
maintain a defined safe state for the equipment / machinery / plant /
apparatus under control of the system
Basic Safety The equipment must be designed and manufactured such that it protects
against risk of damage to persons by electrical shock and other hazards and
against resulting fire and explosion. The protection must be effective under all
conditions of the nominal operation and under single fault condition
Verification The demonstration for each phase of the life-cycle that the (output)
deliverables of the phase meet the objectives and requirements specified
by the inputs to the phase. The verification is usually executed by analysis
and / or testing
Validation The demonstration that the safety-related system(s) or the combination of
safety-related system(s) and external risk reduction facilities meet, in all
respects, the Safety Requirements Specification. The validation is usually
executed by testing
Safety Assessment The investigation to arrive at a judgment - based on evidence - of the safety
achieved by safety-related systems
Further definitions of terms used for safety techniques and measures and the description of safety related
systems are given in IEC 61508-4.
A1.3.2 Abbreviations
FMEDA Failure Mode, Effects and Diagnostic Analysis
SIF Safety Instrumented Function
SIL Safety Integrity Level
SIS Safety Instrumented System
SLC Safety Lifecycle