Pilz PMCprotego S1 Operating Manual page 96

9 Technical Details
9.2 Safety characteristic data
SI_Kennzahlen_protego S_ein_Geber_MTTF_57_Einl
SI_Kennzahlen_protego S_ein_Geber_MTTF_Allg
SI_Kennzahlen_protego S_ein_Geber_MTTF_57_Bild
SI_Kennzahlen_alle_Sicherheitsfunkt_protego S
Si_Kennzahlen_Erläuterung_1
9.2.2 Safe actuator with two encoders
9- SI_Kennzahlen_protego S_zwei_Geber Safe actuator with two encoders
Safety characteristic data
Device
Safety card
SI_Kennzahlen_protego S1_zwei_Geber
SI_Kennzahlen_protego S1_zwei_Geber_Bild
9-4
The characteristic data is valid when using a motor encoder with an
MTTF ≥ 57 years.
The motor encoder is already included in the characteristic data, so no
more calculations need to be performed for the "Safe Actuator" subsys-
tem.
PMCprotego D
PMCprotego S1
Motor encoder with MTTF ³ 57 years
The safety-related characteristic data is valid for all safety functions.
All the units used within a safety function must be considered when cal-
culating the safety characteristic data.
EN ISO 13849-1
Operating mode PL
Safe actuator PL e (Cat. 4)
The safety analysis of the plant or machine may necessitate a second
encoder (external encoder). Example: Fault detection in the mechanical
transmission path between motor and process.
The sensor subsystem consists of the motor encoder (sensor 1) and an
external encoder (sensor 2). A separate PL or SIL must be calculated for
this subsystem. For this subsystem structure, Category 3 with a DC of
99 % is acceptable. The following characteristic data is required for both
sensors (motor encoder and external encoder): MTTF
Subsystem
Safe actuator
EN 954-1 EN IEC 62061
Category SIL CL
Cat. 4 SIL CL 3
PFH [1/h] t [year]
M
1.19E-08 20
and λ /λ.
d d