SIGMATEK SDI 101, Руководство пользователя

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S-DIAS SAFETY DIGITAL INPUT MODULE SDI 101
02.12.2019 Page 11
2.3 Safety-Relevant Parameters
Input Module Safety Parameters Safety Level
SDI 101 including CPU
module SCP 011 / SCP
111
Single channel use:
PFH
D
= 2.23E-09 (1/h)
MTTF
D
= 1829 years
DC = 96.43 %
SFF = 99.26 %
PL d
(1)
/Cat. 2
SIL 3
Two channel use:
PFH
D
= 2.04E-09 (1/h)
MTTF
D
= 2297 years
DC = 96.92 %
SFF = 99.53 %
PL e/Cat. 4
SIL 3
(1)
DC is "high" according to table 5 and the corresponding note EN / ISO 13849. In
combination with the high MTTF
D
value and the good PFH
D
value, the performance level
according to table K.1 is PLd.
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.