Yokogawa EJA440E User Manual download pdf (Page 90)

<Appendix1. Safety Instrumented Systems Installation>

A1-3

IM 01C25T01-06EN

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

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 96

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