ACD GRUPPE M2Smart HMI Case Projektierungshandbuch Seite 44

For a better assessment of the risks, statements of EN 62061 are quoted.
The basic principle of risk is always evaluated in the same way:
The severity of the potential harm and the likelihood of the harm occurring.
Performance Level (PL)
a
b
c
d
e
Table 16: Performance Level (PL) according to EN 13849-1
19 Abbreviations
Abbreviation
B10d
PL
SELV
Table 17: Abbreviations
®
M2Smart HMI Case_Bedien- Projektierhandbuch_Operating Project Engineering Manual_V1.06_de_en
Average probability
of a dangerous failure per hour
1/h
≥ 3 x 10
≥ 10
-
-
Performance Level
Safety Extra Low Voltage
-5 -4
≥ 10
to < 10
-6 -5
to < 10
-6 -6
to < 3 x 10
-7 -6
≥ 10
to < 10
-8 -7
≥ 10
to < 10
Explanation
Number of cycles, up to 10% of
the components fail dangerously
(per channel)
Discrete level indicating the ability
of safety-related devices to
perform a safety function
under foreseeable
conditions
-
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