Festo CMMT-AS-C2-11A-P3, Руководство пользователя, Страница: 32 / 44

Safety reference data of the STO safety function
Wiring Without high test
impulses, without or
with STA evaluation With high test
impulses and with
STA evaluation
1)
With high test
impulses and
without STA evalu-
ation
Probability of danger-
ous failure per hour in
accordance with
EN 61508, PFH [1/h] 3.70 x 10
–11
9.40 x 10
–11
5.90 x 10
–10
Mean time to danger-
ous failure in accord-
ance with
EN ISO 13849-1,
MTTF
d
[a] 2400 1960 1960
Average diagnostic
coverage in accordance
with EN ISO 13849-1,
DC
AVG
[%] 97 95 75
Operating life in
accordance with
EN ISO 13849-1, T
M
[a] 20
Safe failure fraction SFF
in accordance with
EN 61508 [%] 99 99 99
Hardware fault toler-
ance in accordance
with EN 61508, HFT 1
Factor of failures as a
result of shared cause
for non-recognisable
dangerous errors
β
in
accordance with
EN 61508
[%] 5
Classification in
accordance with
EN 61508 Type A
1) Check of the STO safety function and monitoring of the STA diagnostic output by the safety controller at least 1 x within 24 h.
Tab. 15 Safety reference data of the STO safety function
Technical data
32 Festo — CMMT-AS-...-S1 — 2018-02