Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 275
Appendix D PFD and PFH Calculations for a SIL 2 System
De-energize-to-trip 20-year Mission Time
Energize-to-action 20-year Mission Time
1715-IF16 A 3.001 16-channel analog input module 6.44E-05 8.67E-05 8.37E-06 1.27E-05
1715-OB8DE A 3.001 8-channel digital output module 2.68E-05 6.88E-05 5.36E-05 1.34E-05
1715-OF8I A 3.001 8-channel analog output module 4.78E-05 1.48E-04 9.56E-05 2.99E-06
(1) For the latest approved versions, see the Revision Release List available from the Product Certifications link at rok.auto/certifications.
Table 60 - PFD Calculations for 1715 I/O Components
Cat No.
Series
Firmware
Version
(1)
Description
Simplex Configuration Duplex Configuration
PFDde PFDe PFDde PFDe
Table 61 - De-energize-to-trip (20-year Mission Time)
MTTR 24 Hours 20-year Mission Time Simplex Configuration
Duplex Configuration
Cat No.
Series
Firmware
Version
Description
MTBF
λs
λsd
λdu
λdd
SFF
HFT
PFHde
PFDde
STR
ß
ßd
tce'
tge'
HFT
PFHde
PFDde
Arch
STR
1715-
AENTR
A 3.003
Ethernet
adapter
redundant
module
400,540
1.48E-06
6.25E-07
1.25E-08
1.00E-06
99.5%
N/A
N/A
N/A
N/A
1.0%
1.0%
6.91E+02
5.84E+04
1
1.53E-10
1.26E-05
1oo2D
1.70E-08
1715-
IB16D
A 3.001
16-channel
digital
input
module
930,620
5.76E-07
5.75E-07
4.97E-10
4.98E-07
99.9%
0
7.36E-10
6.44E-05
1.07E-06
1.0%
0.5%
6.46E+01
5.84E+04
1
9.55E-11
8.37E-06
1oo2D
1.08E-08
1715-
IF16
A 3.001
16-channel
analog
input
module
930,620
5.76E-07
5.75E-07
4.97E-10
4.98E-07
99.9%
0
7.36E-10
6.44E-05
1.07E-06
1.0%
0.5%
6.46E+01
5.84E+04
1
9.55E-11
8.37E-06
1oo2D
1.08E-08
1715-
OB8DE
A 3.001
8-channel
digital
output
module
797,714
1.84E-08
1.83E-08
2.99E-10
5.86E-08
99.6%
1
2.99E-10
2.68E-05
1.25E-06
1.0%
1.0%
N/A
N/A
1
5.98E-10
5.36E-05
2oo2
1.25E-08
1715-
OF8I
A 3.001
8- channel
analog
output
module
3,007,218
1.26E-07
1.12E-07
5.08E-10
3.86E-09
99.6%
1
5.08E-10
4.78E-05
3.18E-07
1.0%
0.5%
N/A
N/A
1
1.02E-09
9.56E-05
2oo2
3.18E-09
Table 62 - Energize-to-action (20-year Mission Time)
MTTR 24 Hours 20-year Mission Time Simplex Configuration Duplex Configuration
Cat No.
Series
Firmware
Version
Description
MTBF
λs
λsd
λdu
λdd
SFF
HFT
PFHe
PFDe
STR
ß
ßd
tce'
tge'
HFT
PFHe
PFDe
Arch
STR
1715-
AENTR
A 3.003
Ethernet
adapter
redundant
module
397,165
1.39E-06
5.57E-07
1.84E-08
1.11E-06
99.4%
N/A
N/A
N/A
N/A
1.0%
1.0%
9.76E+02
5.84E+04
1
2.43E-10
1.96E-05
1oo2D
1.72E-08
1715-
IB16D
A 3.001
16-channel
digital
input
module
891,078
5.69E-07
5.68E-07
5.13E-09
5.48E-07
99.9%
0
9.90E-10
8.67E-05
1.12E-06
1.0%
0.5%
4.25E+02
5.84E+04
1
1.47E-10
1.27E-05
1oo2D
1.13E-08
1715-IF16 A 3.001
16-channel
analog
input
module
891,078
5.69E-07
5.68E-07
5.13E-09
5.48E-07
99.9%
0
9.90E-10
8.67E-05
1.12E-06
1.0%
0.5%
4.25E+02
5.84E+04
1
1.47E-10
1.27E-05
1oo2D
1.13E-08
1715-
OB8DE
A 3.001
8-channel
digital
output
module
373,248
3.56E-08
3.51E-08
7.23E-10
4.87E-08
99.1%
1
7.23E-10
6.88E-05
2.66E-06
1.0%
1.0%
N/A
N/A
1
1.30E-10
1.34E-05
1oo2
5.34E-06
1715-
OF8I
A 3.001
8-channel
analog
output
module
540,350
3.15E-07
3.09E-07
1.65E-09
8.67E-08
99.6%
1
1.65E-09
1.48E-04
1.83E-06
1.0%
0.5%
N/A
N/A
1
3.44E-11
2.99E-06
1oo2
3.68E-06
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