246 Safe torque off function
Abbreviations
Declaration of conformity
Declaration of conformity (3AXD10000302783) is available on the Internet. See
section Document library on the Internet on the inside of the back cover.
Abbr. Reference Description
Cat. EN ISO 13849-1:2015 Classification of the safety-related parts of a control system
in respect of their resistance to faults and their subsequent
behavior in the fault condition, and which is achieved by the
structural arrangement of the parts, fault detection and/or by
their reliability. The categories are: B, 1, 2, 3 and 4.
CCF EN ISO 13849-1:2015 Common cause failure (%)
DC EN ISO 13849-1:2015 Diagnostic coverage
FIT IEC 61508 Failure in time: 1E-9 hours
HFT IEC 61508 Hardware fault tolerance
MTTF
D
EN ISO 13849-1:2015 Mean time to dangerous failure: (The total number of life
units) / (the number of dangerous, undetected failures)
during a particular measurement interval under stated
conditions
PFD
avg
IEC 61508 Average probability of dangerous failure on demand
PFH IEC 61508 Average frequency of dangerous failures per hour
PL EN ISO 13849-1:2015 Performance level. Levels a…e correspond to SIL
SC IEC 61508 Systematic capability
SFF IEC 61508 Safe failure fraction (%)
SIL IEC 61508 Safety integrity level (1…3)
SILCL IEC 62061:2015
EN 62061:2005+
AC:2010+A1:2013+
A2:2015
Maximum SIL (level 1…3) that can be claimed for a safety
function or subsystem
STO IEC 61800-5-2:2016
EN 61800-5-2:2007
Safe torque off
T1 IEC 61508-6 Proof test interval. Proof test interval. T1 is a parameter
used to define the probabilistic failure rate (PFH or PFD) for
the safety function or subsystem. Performing a proof test at
a maximum interval of T1 is required to keep the SIL
capability valid. The same interval must be followed to keep
the PL capability (EN ISO 13849) valid. Note that any T1
values given cannot be regarded as a guarantee or
warranty.
See also section Maintenance on page 242.
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