47
item Controller BL 1-04 /C
― Product manual
8.11 STO [X3]
Characteristic values
Characteristic
Value
Safety level
Category 4 and performance level e or SIL3/SIL CL3.
PFH(Probability of dange
-
rous Failure per Hour)
3 x 10
–11
PFD (Probability of dange
-
rous Failure on Demand)
5 x 10
-6
DCavg (Average Diagnostic
Coverage)
High
MTTFd (Mean time to
dangerous failure)
Limited to 100 years (cat. 3)
Limited to 2,500 years (cat. 4)
See also section 11.2 CE conformity (Machinery Directive) on page 74.
INFO
Proof-testing of the STO function
Comply with the following test intervals in order to reach the specified values:
▪ For SIL 2, PL d/category 3: 1x per year
▪ For SIL 3, PL e/category 3: every 3 months
▪ For SIL 3, PL e/category 4: daily
8.11.1 Electrical data of the STO function
Control inputs STOA/STOB [X3]
Characteristic
Value
Nominal voltage
24 V (referred to GNDA/GNDB)
Voltage range
19.2 V… 28.8 V
Permissible ripple
2 % (referred to a nominal voltage of 24 V)
Nominal current
20 mA typ., 30 mA typ.
Switch-on input voltage
threshold
>= 16 V
Switch-off input voltage
threshold
< 5 V
For the technical data of the digital inputs DIN6 and DIN7 or of the digital output DIN0, see the section 8.10 I/O Interface [X1]
on page 42.
