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Appendix A
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
A-2-2 Calculated PFH Values
Model Proof test interval (years) PFD
NE1A-SCPU01(-V1)(-EIP) 0.25 4.68E-07
0.5 9.32E-07
11.86E-06
2 3.72E-06
NE1A-SCPU02(-EIP) 0.25 5.90E-07
0.5 1.17E-07
12.34E-06
24.68E-06
Model PFH
NE1A-SCPU01(-V1)(-EIP) 4.25E-10
NE1A-SCPU02(-EIP) 5.39E-10
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