Calculated Values Of Pfd And Pfh; Calculated Pfd Values; Calculated Pfh Values - Omron DEVICENET SAFETY - 04-2005 Operation Manual

B

Calculated Values of PFD and PFH

Calculated values of PFD and PFH of the DST1-series Safety I/O Terminals are given in the following tables.
These values must be calculated for the overall devices within the system to comply with the SIL level re-
quired for application.
B-1

Calculated PFD Values

Model
DST1-ID12SL-1
DST1-MD16SL-1
DST1-MRD08SL-1
IMPORTANT:
B-2

Calculated PFH Values

Model
DST1-ID12SL-1
DST1-MD16SL-1
DST1-MRD08SL-1
B-1 Calculated PFD Values
Proof test interval (years)
0.25
0.5
1
2
0.25
0.5
1
2
0.25
0.5
The proof test interval of the DST1-MRD08SL-1 must not exceed 0.5 years because the
maintenance interval for the relay contacts must not exceed a period of 6 month to satisfy
safety category 4 in accordance with EN 954-1.
PFD
9.58E-07
1.92E-06
3.83E-06
7.66E-06
1.21E-06
2.41E-06
4.82E-06
9.64E-06
5.81E-06
1.18E-05
PFH
8.75E-10
1.11E-09
5.24E-09
99