User Manual Owner manual
Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 295
PFD and PFH Calculations for a SIL 2 System Appendix E
The PFD calculations in Table 67 are calculated for a 5-year proof test interval
(43,800 hours) and are specific to1715 I/O components in ControlLogix
systems.
De-energize-to-trip 5-Year Proof Test Interval
Table 67 - 5-year PFD Calculations for 1715 I/O Components
Cat No.
61508 2000
(1)
Series
Firmware
Version
(2)
Description
Simplex Configuration Duplex Configuration
PFDde PFDe PFDde PFDe
1715-AENTR x A 2.001 EtherNet adapter redundant module 5.92E-04 7.53E-04 2.19E-06 3.73E-06
1715-IB16D x A 2.001 16-channel digital input module 1.71E-05 2.57E-05 2.12E-06 2.21E-06
1715-IF16 x A 2.001 16-channel analog input module 1.71E-05 2.57E-05 2.12E-06 2.21E-06
1715-OB8DE x A 2.001 8-channel digital output module 6.64E-06 1.93E-04 1.33E-05 1.97E-06
1715-OF8I x A 2.001 8-channel analog output module 1.26E-05 7.42E-04 2.50E-05 1.70E-05
(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 68 - De-energize-to-trip 5-Year Proof Test Interval
MTTR 10 Hours PTI 5.0 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
A2.001 EtherNet
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%
5.30E+02
3.57E+02
1
3.47E-09
2.19E-06
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%
1.98E+02
0
7.48E-10
1.71E-05
2.82E-07
1.0%
0.5%
6.13E+01
4.42E+01
1
4.77E-10
2.12E-06
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%
1.98E+02
0
7.48E-10
1.71E-05
2.82E-07
1.0%
0.5%
6.13E+01
4.42E+01
1
4.77E-10
2.12E-06
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%
2.81E+02
1
7.68E-10
6.64E-06
1.03E-07
1.0%
1.0%
N/A
N/A
1
1.54E-09
1.33E-05
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%
2.50E+02
1
9.13E-10
1.26E-05
1.83E-07
1.0%
0.5%
N/A
N/A
1
1.82E-09
2.50E-05
2oo2
1.34E-09