Observed Standards; Acronyms And Abbreviations; Purpose Of The Product - PR electronics 9116-002 Manual De Instrucciones

1

Observed standards

standard Description
Functional safety of electrical / electronic / programmable electronic
iec 61508
safety-related systems
iec 61508- Part 2: Requirements for electrical / electronic / programmable electronic
2:2000 safety-related systems
iec 61508-
Part 3: software requirements
3:1998
iec 61326-3-
immunity requirements for safety-related systems
1:2008
2

acronyms and abbreviations

acronym /
abbreviation
element
Probability of Failure
PFD
Probability of danger-
PFH
ous Failure per Hour
sFF safe Failure Fraction
siF
sil safety integrity level
3

Purpose of the product

conversion and scaling of temperature (Pt, Ni and tc), voltage, potentiometer, linear resistance
and current signals from hazardous area.
the device can be mounted in the safe area and in zone 2 / div. 2 and receive signals from zone
0, 1, 2, 20, 21 and 22 / class i/ii/iii, Div. 1, Gr. a-G.
error events, including cable faults, are monitored and signalled via the individual status relay
and/or a collective electronic signal via the power rail.
the 9116 has been designed, developed and certified for use in sil 2 applications according
to the requirements of iec 61508.
9116 UNiVeRsal coNVeRteR
Designation
on Demand
safety integrity
Function
Version No. V2R0
Description
term defined by iec 61508 as "part of a
subsystem comprising a single component or any
group of components that performs one or more
element safety functions"
this is the likelihood of dangerous safety function
failures occurring on demand.
the term "Probability" is misleading, as iec
61508 defines a Rate.
safe Failure Fraction summarises the fraction of
failures which lead to a safe state and the fraction
of failures which will be detected by diagnostic
measures and lead to a defined safety action.
Function that provides fault detection (to ensure the
necessary safety integrity for the safety functions)
the international standard iec 61508 specifies four
discrete safety integrity levels (sil 1 to sil 4). each
level corresponds to a specific probability range
regarding the failure of a safety function.
safety Manual
3