Omron NE1A-SCPU01 - 07-2009 Operation Manual page 312

Appendix 2: Calculated Values of PFD and PFH
Calculated values of PFD and PFH for the NE1A-series Controller are given in the following tables. These val-
ues must be calculated for the overall devices within the system to comply with the SIL required for application.
A-2-1 Calculated PFD Values
NE1A-SCPU01(-V1)(-EIP)
NE1A-SCPU02(-EIP)
A-2-2 Calculated PFH Values
NE1A-SCPU01(-V1)(-EIP)
NE1A-SCPU02(-EIP)
278
Model Proof test interval (years)
Model
0.25
0.5
1
2
0.25
0.5
1
2
PFH
4.25E-10
5.39E-10
Appendix A
PFD
4.68E-07
9.32E-07
1.86E-06
3.72E-06
5.90E-07
1.17E-07
2.34E-06
4.68E-06