Specifications

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EN ISO 13849-1EN IEC 62061
Bro_Safety_Info_DE_Rev01.indd 38-39Bro_Safety_Info_DE_Rev01.indd 38-39
Safety-related parameters
The following safety-related parameters must be recorded in accordance with EN ISO 13849-1 within the
scope of proof of safety:
Abbreviation
Explanation
PL
MTTF
d
B
10d
T
M
DC
Performance Level
Mean Time to Failure
dangerous
Mission Time
Diagnostic Coverage
Mean duration till a dangerous failure takes place, which can be recorded with the
help of an analysis of the field data or by means of a prediction
Discrete level that specifies the capacity of the safety-related parts of a control
system to execute a safety function under foreseeable conditions;
Classification from PL a (maximum probability of failure) to PL e
(minimum probability of failure)
Number of switching cycles during which 10% failed during a random test of the
observed worn components (e.g. electromechanical components)
Planned duration of use
Diagnostics coverage degree, i.e. decrease of probability of dangerous failures
taking place due to the implementation of automatic diagnostics tests
The following safety-related parameters must be recorded in accordance with EN IEC 62061 within the scope
of proof of safety:
Abbreviation
Explanation
Safety Integrity Level
Probability of a
dangerous failure per
hour
Lifetime or Proof Test
Interval
Lambda
Safe Failure Fraction
Hardware Fault
Tolerance
Diagnostic Coverage
Mean Time to Repair
Beta
SIL
PFH
D
T1
SFF
HFT
DC
MTTR
β
Discrete level that defines the requirements for safety integrity of the safety-
related control system functions of the electrical control system of the machine;
classification from SIL 3 (highest level) to SIL 1 (lowest level)
Probability of a dangerous failure per hour
Time interval during which the protective equipment must be manually tested
Rate of dangerous failures
Fraction of safe failures of the total failure rate that does not lead to a dangerous
failure
Fault tolerance of the hardware
Diagnostics coverage degree, i.e. decrease of probability of dangerous failures
taking place due to the implementation of automatic diagnostics tests
Mean time until when the system is repaired after a failure
Failure factor having a common cause
When and which standard should be used:
The f
used
Tech
Non-ele
Electrom
electro
Compl
Mixed sy
electrom
Mixed s
comple
Mixed sy
a) No
or
b) No
co
* Onl
** all arch
D
λ
EN_DE_Safety_Rev.01.fm Seite 17 Freitag, 30. Mai 2008 1:22 13
Textfarbe Schmuck 45,0° 240,0 LPI