26
Festo — CMMT-ST-C8-1C-...-S0 — 2021-04b
Technical data
Safety specifications
Certificate issuing authority
TÜV Rheinland, Certification Body of Machinery, NB 0035
Certificate no.
01/205/5696.00/19
Tab. 10: Safety specifications
General safety reference data
Request rate in accord-
ance with EN 61508
High request rate
Reaction time when the
safety sub-function is
requested (t
STO,In
)
[ms]
With stepper motor: max. 11 (typically 6)
With EC motor: max. 55 (typically 6)
Tab. 11: Safety reference data and safety specifications
Safety reference data for the safety sub-function STO
Circuitry
Stepper motor
EC motor without
evaluation of STA
EC motor with eval-
uation of STA
Safety sub-function
in accordance with
EN 61800-5-2
Safe torque off (STO)
Safety integrity level
in accordance with
EN 61508
SIL 3
SIL 2
SIL 3
SIL claim limit for a
subsystem in accord-
ance with EN 62061
SILCL 3
SILCL 2
SILCL 3
Category in accordance
with EN ISO 13849-1
Cat. 3
Performance level
in accordance with
EN ISO 13849-1
PL e
PL d
PL e
Probability of dan-
gerous failure per hour
in accordance with
EN 61508, PFH
[1/h]
9.5 * 10
-11
6 * 10
-10
3.6 * 10
-10
Mean time to
dangerous failure
in accordance with
EN ISO 13849-1, MTTF
d
[a]
2000
1600
