Pfd calculations with 10-hour mttr, De-energize-to-trip 1-year proof test interval – Rockwell Automation 1715-OF8I Redundant I/O System User Manual User Manual
Page 291
Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
291
PFD and PFH Calculations for a SIL 2 System
Appendix E
PFD Calculations with 10-hour MTTR
The PFD calculations in
are calculated for a 1-year proof test interval
(8760 hours) and are specific to1715 I/O components in ControlLogix systems.
De-energize-to-trip 1-year Proof Test Interval
Table 61 - 1-year PFD Calculations for 1715 I/O Components
Cat No.
61
508 20
00
(1)
Ser
ies
Firmware
Version
(2)
Description
Simplex Configuration
Duplex Configuration
PFDde
PFDe
PFDde
PFDe
1715-AENTR
x
A
2.001
EtherNet adapter redundant module
1.21E-04
1.55E-04
4.65E-07
7.84E-07
1715-IB16D
x
A
2.001
16-channel digital input module
4.04E-06
6.31E-06
4.29E-07
4.48E-07
1715-IF16
x
A
2.001
16-channel analog input module
4.04E-06
6.31E-01
4.29E-07
4.48E-07
1715-OB8DE
x
A
2.001
8-channel digital output module
1.52E-06
4.14E-05
3.03E-06
4.16E-07
1715-OF8I
x
A
2.001
8-channel analog output module
2.91E-06
1.53E-04
5.79E-06
3.62E-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
Table 62 - De-energize-to-trip 1-year Proof Test Interval
MTTR 10 Hours
PTI 1.0 Years
Simplex Configuration
Duplex Configuration
Ca
t N
o.
Se
rie
s
Fi
rm
w
are
Ve
rs
io
n
De
scr
ip
tio
n
MT
BF
λs
λdu
λd
d
SFF
tc
e'
HFT
PFH
de
PFDde
ST
R
β
βd
tc
e'
tg
e'
HFT
PFH
de
PFDde
Arch
ST
R
1715-
AENTR
A
2.001 EtherNet
adapter
dual
module
84
1,973
8.43
E-07
9.82
E-09
3.34
E-07
97
.74%
N/A
N/A
N/A
N/A
N/A
1.0%
1.0%
1.14
E+0
2
7.94
E+0
1
1
3.45
E-09
4.65
E-07
1oo2
D
8.43
E-08
1715-
IB16D
A
2.001 16-
channel
digital
input
module
3,53
5,79
1
2.06
E-07
6.57
E-10
7.60
E-08
99
.77%
4.76
E+0
1
0
7.48
E-10
4.04
E-06
2.82
E-07
1.0%
0.5%
2.03
E+0
1
1.68
E+0
1
1
4.77
E-10
4.29
E-07
1oo2
D
2.06
E-09
1715-
IF16
A
2.001 16-
channel
analog
input
module
3,53
5,791
2.06
E-07
6.57
E-10
7.60
E-08
99
.77%
4.76
E+0
1
0
7.48
E-10
4.04
E-06
2.82
E-07
1.0%
0.5%
2.03
E+0
1
1.68
E+0
1
1
4.77
E-10
4.29
E-07
1oo2
D
2.06
E-09
1715-
OB8DE
A
2.001 16-
channel
digital
output
module
9,67
7,085
7.94
E-08
2.96
E-10
2.36
E-08
99
.26%
6.42
E+0
1
1
7.66
E-10
1.52
E-06
1.03
E-07
1.0%
1.0%
N/A
N/A
1
1.53
E-09
3.03
E-06
2oo2
7.94
E-10
1715-
OF8I
A
2.001 16-
channel
analog
output
module
5,44
6,179
1.34
E-07
5.50
E-10
4.96
E-08
99.5
1%
5.80
E+0
1
1
8.90
E-10
2.91
E-06
1.83
E-07
1.0%
0.5%
N/A
N/A
1
1.78
E-09
5.79
E-06
2oo2
1.34
E-09