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Appendix 2: Calculated Values of PFD and PFH
Appendix 2: Calculated Values of PFD and PFH
Calculated values of PFD and PFH of the DST1-series Safety I/O Terminals are given in
the following tables. These values must be calculated for the overall devices within the
system to comply with the SIL level required for application.
A-2-1 Calculated
PFD
Values
Model
Proof test interval (years)
PFD
0.25 9.58E-07
0.5 1.92E-06
1 3.83E-06
DST1-ID12SL-1
2 7.66E-06
0.25 1.21E-06
0.5 2.41E-06
1 4.82E-06
DST1-MD16SL-1
2 9.64E-06
0.25 5.81E-06
DST1-MRD08SL-1
0.5 1.18E-05
IMPORTANT
The proof test interval of the DST1-MRD08SL-1 must not exceed 0.5 years
because the maintenance interval for the relay contacts must not exceed a period
of 6 month to satisfy safety category 4 in accordance with EN 954-1.
A-2-2 Calculated
PFH
Values
Model
PFH
DST1-ID12SL-1 8.75E-10
DST1-MD16SL-1 1.11E-09
DST1-MRD08SL-1 5.24E-09
A-13
Содержание DST1 Series
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Страница 5: ...DST1 series Safety I O Terminals Operation Manual Produced April 2005 ...
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Страница 24: ...Section 1 Overview ...
Страница 44: ...Section 2 General Procedure ...
Страница 50: ...Section 3 Configuration ...
Страница 63: ...Section 4 Specifications ...
Страница 67: ...Section 5 DST1 series ...
Страница 79: ...Section 6 Troubleshooting and Maintenance ...
Страница 87: ...Section 7 Wiring Examples ...
Страница 97: ...Appendices ...
Страница 114: ...Cat No Z904 E1 01 OPERATION MANUAL DST1 series Safety I O Terminals ...