Yokogawa EJA440E User Manual download pdf (Page 40)

<Appendix 1. Safety Instrumented Systems Installation>

A1-3

IM 01C25T03-01E

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

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