User Manual Owner manual
Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 293
PFD and PFH Calculations for a SIL 2 System Appendix E
The PFD calculations in Table 64 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 64 - 2-year PFD Calculations for 1715 I/O Components
Cat No.
61508 2000
(1)
Series
Firmware
Version
(2)
Description
Simplex Configuration Duplex Configuration
PFDdePFDePFDdePFDe
1715-AENTR x A 2.001 EtherNet adapter redundant module 2.39E-04 3.04E-04 8.96E-07 1.52E-06
1715-IB16D x A 2.001 16-channel digital input module 7.32E-06 1.12E-05 8.53E-07 8.88E-07
1715-IF16 x A 2.001 16-channel analog input module 7.32E-06 1.12E-05 8.53E-07 8.88E-07
1715-OB8DE x A 2.001 8-channel digital output module 2.80E-06 7.92E-05 5.59E-06 8.00E-07
1715-OF8I x A 2.001 8-channel analog output module 5.32E-06 3.00E-04 1.06E-05 6.88E-06
(1) Calculated MTBF and PFD by FMEA to 61508-2000.
(2) For the latest approved versions, see the Revision Release List available from the Product Certifications link at http://www.ab.com.
Table 65 - De-energize-to-trip 2-year Proof Test Interval
MTTR 10 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%
2.18E+02
1.49E+02
1
3.46E-09
8.96E-07
1oo2D
8.43E-08
1715-
IB16D
A2.00116-
channel
digital
input
module
3,535,791
2.06E-07
6.57E-10
7.60E-08
99.77%
8.51E+01
0
7.48E-10
7.32E-06
2.82E-07
1.0%
0.5%
3.05E+01
2.37E+01
1
4.77E-10
8.53E-07
1oo2D
2.06E-09
1715-
IF16
A2.00116-
channel
analog
input
module
3,535,791
2.06E-07
6.57E-10
7.60E-08
99.77%
8.51E+01
0
7.48E-10
7.32E-06
2.82E-07
1.0%
0.5%
3.05E+01
2.37E+01
1
4.77E-10
8.53E-07
1oo2D
2.06E-09
1715-
OB8DE
A2.00116-
channel
digital
output
module
9,677,085
7.94E-08
2.96E-10
2.36E-08
99.26%
1.18E+02
1
7.67E-10
2.80E-06
1.03E-07
1.0%
1.0%
N/A
N/A
1
1.53E-09
5.59E-06
2oo2
7.94E-10
1715-
OF8I
A2.00116-
channel
analog
output
module
5,446,179
1.34E-07
5.50E-10
4.96E-08
99.51%
1.06E+02
1
8.96E-10
5.32E-06
1.83E-07
1.0%
0.5%
N/A
N/A
1
1.79E-09
1.06E-05
2oo2
1.34E-09