•
IEC 60204-1: 2016 Stop Category 0 – uncontrolled stop
•
EN 60204-1: 2018 Stop Category 0 – uncontrolled stop
•
IEC/EN 61508: 2010 SIL 2
•
IEC 61800-5-2: 2016 SIL 2
•
EN 61800-5-2: 2017 SIL 2
•
IEC 62061: 2005 and A1: 2012 and A2: 2015
•
EN 62061: 2005 and Cor.:2010 and A1: 2013 and A2: 2015
•
IEC/EN 62061: 2015 SIL CL2
•
EN ISO 13849-1: 2015 Category 3, PL d
•
EN ISO 13849-2: 2014
8.5 Abbreviations and Conventions
Table 28: Safety-related Abbreviations and Conventions
Abbrevia‐
tion
Reference
Description
Cat.
EN ISO 13849-1
Category B, 1–4
DC
–
Diagnostic coverage
FIT
–
Failure in time
Failure rate: 1E-9/hour
HFT
EN IEC 61508
Hardware fault tolerance
HFT = n means that n + 1 faults may lead to a loss of the safety function.
MTTF
D
EN ISO 13849-1
Mean time to failure – dangerous
Unit: years
PFH
EN IEC 61508
Probability of dangerous failures per hour
Take this value into account if the safety device is operated in high demand mode or in continu-
ous operating mode, where the frequency of demands for operation made on a safety-related
system occurs more than once per year.
PL
EN ISO 13849-1
Performance level
A discrete level used to specify the capability of safety-related parts of a system to perform safe-
ty-oriented functions under foreseeable conditions. Levels: a–e.
SFF
EN IEC 61508
Safe Failure Fraction [%]
Proportion of safe failures and detected dangerous failures of a safety function or a subsystem as
a percentage of all possible failures.
SIL
EN IEC 61508
EN IEC 62061
Safety Integrity Level
STO
EN IEC 61800-5-2
Safe Torque Off
Functional Safety Concept
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