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11.3.3.3
Subsystem SB3
Subsystem SB3 is also an encapsulated subsystem for which the safety-related data is designated by
the manufacturer.
Subsystem SB3 includes the drive controller T1 of the PMC SC6 or PMC SI6 series including
PMC SR6 safety module.
Performance Level – PL and category
}
PL = e
}
Category = 4
Source: Pilz GmbH & Co. KG
Probability of a dangerous failure – PFH
PFH
= 5 × 10
D
Source: Pilz GmbH & Co. KG
11.3.3.4
Wiring the subsystems
Safety relay K1 is configured and wired so that it monitors position switches B1 and B2 and their
wiring for plausibility, cross circuits and short circuits. Due to the installation of these components
inside an electrical installation space, exclusion of faults in accordance with DIN EN ISO 13849-2,
Appendix D, Table D 5.2 is assumed for the wiring between safety relay K1 and drive controller T1.
11.3.3.5
Safety figures for the entire system
The following table includes safety figures for individual subsystems and the resulting probability of a
total failure.
Subsystem
SB1 – Input
SB2 – Logic
SB3 – Output
Entire system
PFH
– Subsystems and entire system
D
The determination and calculation of the dangerous failure probability per hour for the example
systems with the STO and SS1 safety functions result in a value of 3.2 × 10
to the respective system PL e and a SIL 3 in a high, continuous operating mode (see following table).
Performance Level
a
b
c
d
e
PL, PFH
Manual PMC SR6 safety module
1005344-en-US-01
Intern
-9
[1/h]
, SIL – Entire system
D
D
Value source
SISTEMA calculation
Manufacturer information
Manufacturer information
SISTEMA calculation
Probability of a dangerous
failure [1/h]
-5
-4
≥ 10
to < 10
-6
-5
≥ 3 × 10
to < 10
-6
-6
≥ 10
to < 3 × 10
-7
-6
≥ 10
to < 10
-8
-7
≥ 10
to < 10
Probability of a dangerous
failure [1/h]
-8
PFH
= 2.47 × 10
D
-9
PFH
= 2.31 × 10
(STO)
D
-9
PFH
= 2.34 × 10
(SS1)
D
-9
PFH
= 5.0 × 10
D
-8
PFH
= 3.2 × 10
D
-8
[1/h], which corresponds
Safety Integrity Level
No corresponding level
1
1
2
3
Pilz | 39
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