SIGMATEK SDM 081, Руководство по эксплуатации

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SDM 081 S-DIAS SAFETY DIGITAL MIXED MODULE
Page 12 07.02.2022
Mixed Module Safety Parameters Safety Levels
SDM 081 including SCP
211/SCP 111-S CPU
Module
Inputs 1-channel application:
PFH
D
= 2.3E-09 (1/h)
MTTF
D
= 1162 years
DC = 97 %
SFF = 99 %
PFH
D
= 7.7E-10 (1/h)
MTTF
D
= 1267 years
DC = 98 %
SFF = 99 %
1-channel application:
PL d
(1)
/ Cat. 2
SIL 3
2-channel application:
PL e / Cat. 4
SIL 3
Outputs PFH
D
= 3.1E-09 (1/h)
MTTF
D
= 903 years
DC = 98 %
SFF = 99 %
PL e / Cat. 4
SIL 3
(1)
According to Table 5 and the corresponding notes EN / ISO 13849 in the "high" range.
In combination with the high MTTF
D
value and the good PFH
D
value, DC is the performance
level PLd according to table K.1.
Reason for SIL 3 with single-channel use:
Because the high SFF value is greater than 99 %, SIL 3 can be accepted with a hardware
tolerance (HFT) of 0 according to EN 62061.