Abbreviations And Conventions - Danfoss VLT MSD 510 Operating Manual

Operating Guide | VLT® Multiaxis Servo Drive MSD 510 System
• 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‐ Reference
tion
Cat. EN ISO 13849-1
DC –
FIT –
HFT EN IEC 61508
MTTF EN ISO 13849-1
D
PFH EN IEC 61508
PL EN ISO 13849-1
SFF EN IEC 61508
SIL EN IEC 61508
EN IEC 62061
STO EN IEC 61800-5-2
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Description
Category B, 1–4
Diagnostic coverage
Failure in time
Failure rate: 1E-9/hour
Hardware fault tolerance
HFT = n means that n + 1 faults may lead to a loss of the safety function.
Mean time to failure – dangerous
Unit: years
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.
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.
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.
Safety Integrity Level
Safe Torque Off
Functional Safety Concept
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