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Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 299
PFD and PFH Calculations for a SIL 2 System Appendix E
The PFD calculations in Table 72 are calculated for a 2-year proof test interval
(17,520 hours) and are specific to1715 I/O components in ControlLogix
systems.
De-energize-to-trip 2-year Proof Test Interval
Table 72 - De-energize-to-trip 2-year Proof Test Interval
MTTR 24 Hours PTI 2.0 Years Simplex Configuration Duplex Configuration
Cat No. Series Firmware Version Description MTBF λs λdu λdd SFF tce' HFT PFHde PFDde STR β βd tce' tge' HFT PFHde PFDde Arch STR
1715-
AENTR
A2.001EtherNet
adapter
dual
module
841,973 8.43E-07 9.82E-09 3.34E-07 97.74% N/A N/A N/A N/A N/A 1.0% 1.0% 2.32E+02 1.63E+02 1 3.46E-09 9.44E-07 1oo2D 8.43E-08
1715-
IB16D
A 2.001 16-
channel
digital
input
module
3,535,791 2.06E-07 6.57E-10 7.60E-08 99.77% 9.91E+01 0 7.48E-10 8.39E-06 2.82E-07 1.0% 0.5% 4.45E+01 3.77E+01 1 4.77E-10 8.60E-07 1oo2D 2.06E-09
1715-
IF16
A 2.001 16-
channel
analog
input
module
3,535,791 2.06E-07 6.57E-10 7.60E-08 99.77% 9.91E+01 0 7.48E-10 8.39E-06 2.82E-07 1.0% 0.5% 4.45E+01 3.77E+01 1 4.77E-10 8.60E-07 1oo2D 2.06E-09
1715-
OB8DE
A 2.001 16-
channel
digital
output
module
9,677,085 7.94E-08 2.96E-10 2.36E-08 99.26% 1.32E+02 1 7.67E-10 3.13E-06 1.03E-07 1.0% 1.0% N/A N/A 1 1.53E-09 6.25E-06 2oo2 7.94E-10
1715-
OF8I
A 2.001 16-
channel
analog
output
module
5,446,179 1.34E-07 5.50E-10 4.96E-08 99.51% 1.20E+02 1 8.96E-10 6.02E-06 1.83E-07 1.0% 0.5% N/A N/A 1 1.79E-09 1.20E-05 2oo2 1.34E-09