Bosch Rexroth VCH 08.1 Manual page 40

38/117 Bosch Rexroth AG
Technical Data
Quantitative safety relevant specifi‐
cations for emergency stop button
and enabling button
Relationship between Performance
Level (PL) and Safety Integrity Lev‐
el (SIL)
● Emergency stop button:
Bosch Rexroth specifies a B
ta" on page 27. Other values (e.g. SIL, PL, Category) cannot be specified
by Bosch Rexroth.
Explanation: Bosch Rexroth solely delivers the control element, but no
evaluation of the element The customer has to connect the emergency
stop button to his application on his own. Depending on the connection of
the emergency stop to the machine the SIL- or category and PL-value can
be determined.
● Enabling button:
Bosch Rexroth specifies category and PL in accordance to EN ISO
13849-1. Derived from this value Bosch Rexroth also specifies a PFH- and
MTTF value in accordance to EN ISO 13849-1, see also
d-
"Enabling Button" on page
cannot be specified by Bosch Rexroth.
The enabling button has only been evaluated in accordance to EN ISO
13849-1. A B value is not available for the enabling button, as this button
10d
consists of the mechanic element and the electronic evaluation. This
means that Bosch Rexroth specifies MTTF
from these values also Category, PL and PFH) for the enabling button as
a whole (starting from the button element up to the clamps within the con‐
nection box).
When evaluating safety functions according to IEC EN 62601 the PL (Perform‐
ance Level) can be transformed into SIL (Safety Integrated Level) by following
the equivalence table of EN ISO 13849-1.
Performance Level (PL) according to EN
ISO 13849-1
a
b
c
d
e
Fig.4-26: (EN ISO 13849-1) - Relationship between Performance Level (PL) and
Safety Integrity Level (SIL)
PL (Performance Level)
a
b
c
d
e
Fig.4-27: EN ISO 13849-1 - Performance Level (PL)
DOK-SUPPL*-VCH*08.1***-PR02-EN-P
Rexroth IndraControl VCH 08.1 Hand-held Terminal
value, see also chapter 4 "Technical Da‐
10d
28. SIL (according to EN 62061 or EN 61508)
and DC values (and derived
d
Safety Integrity Level (SIL) according to
IEC 61508-1
No corresponding value
1
1
2
3
Average probability of a dangerous breakdown per
hour 1/h
≥10 -5 to < 10 -4
3 x ≥10 -6 to < 10 -5
≥10 to < 3 x 10
-6 -6
≥10 -7 to < 10 -6
≥10 -8 to < 10 -7
chapter 4.4