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1. Safety Information
Introduction
This section provides information necessary to design, install, verify and maintain a Safety Instru-
mented Function (SIF) utilizing a Masoneilan Smart Valve Interface, SVI II ESD. This manual pro-
vides necessary requirements for meeting the IEC 61508 or IEC 61511 functional safety
standards.
Terms and Abbreviations
The following terms and abbreviations are related to safety functions of the SVI II ESD and are
used throughout this document.
Safety
Functional
Safety
Basic
Safety
Safety
Assess-
ment
Fail-
Safe State
Fail Safe
Fail
Dangerous
Fail
Dangerous
Unde-
tected
Fail
Danger-
ous
Detected
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Freedom from unacceptable risk of harm.
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.
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 con-
dition.
The investigation to arrive at a judgment - based on evidence - of the
safety achieved by safety-related systems.
State where the SVI II ESD is de-energized and has exhausted Actuator 1
in a single acting configuration or has caused Actuator 1 to be at an equal
or lower pressure than Actuator 2 in a dual acting configuration.
Failure that causes the valve to go to the defined fail-safe state without a
demand from the process.
Failure that does not respond to a demand from the process (i.e. being
unable to go to the defined fail-safe state).
Failure that is dangerous and that is not being diagnosed by automatic
stroke testing.
Failure that is dangerous but is detected by automatic stroke
testing.
Masoneilan SVI II ESD Quick Start Guide =| 9
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