Manual

<A1. SAFETY INSTRUMENTED SYSTEMS INSTALLATION>

A1-4

IM 01R01B30-00E-E 5th edition February 01, 2013 -00

A1.3 Denitions and Abbreviations

A1.3.1 Denitions

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 dened 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 re and explosion. The protection must be effective under all

conditions of the nominal operation and under single fault condition

Verication The demonstration for each phase of the life-cycle that the (output)

deliverables of the phase meet the objectives and requirements specied

by the inputs to the phase. The verication 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 Specication. 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 denitions 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