IDEC FS1A Controller - Manual (Page 18)

PRODUCT SPECIFICATIONS
2-6
Safety performance
In the case of using safety outputs as dual channel outputs, SafetyOne can be used in a system
for control category B to 4 and performance level a to e in accordance with ISO13849-1(2006).
In the case of using safety outputs as single channel outputs, SafetyOne can be used in a
system for control category B to 3 and performance level a to d in accordance with
ISO13849-1(2006).
Average probability of failure on demand (PFD) and Probability of a dangerous failure
per hour (PFH)
・
In the case of using safety outputs as dual channel outputs
The following table describes PFD and PFH in the case of dual channel outputs. They are
needed for calculation of safety integrity level (SIL) which is applied to a system with SafetyOne.
In this case SafetyOne can be used in a system for SIL 1 to 3.
Proof test interval Note1
Average Probability of Failure
on Demand (PFD) Probability of a dangerous Failure per
Hour (PFH)
6 months < 2.0 x 10 -5
1 year < 3.5 x 10 -5
2 years < 6.4 x 10 -5
< 1.3 x 10 -8
・ In the case of use safety outputs as single channel outputs
The following table describes PFD and PFH in the case of single channel outputs. They are
needed for calculation of safety integrity level (SIL) which is applied to a system with SafetyOne.
In this case SafetyOne can be used in a system for SIL 1 to 2.
Proof test interval Note1
Average Probability of Failure
on Demand (PFD) Probability of a dangerous Failure per
Hour (PFH)
6 months < 4.0 x 10 -5
1 year < 7.4 x 10 -5
2 years < 1.5 x 10 -4
5 years < 3.5 x 10 -4
< 2.0 x 10 -8
Note. Refer to Maintenance and Inspection in “APPENDIX” for proof test procedure.
Mean Time To dangerous Failure (MTTF
d
) and diagnostic coverage (DC)
・ In the case of using safety outputs as dual channel outputs
The following table describes MTTF
d
and DC in the case of dual channel outputs. They are
needed for the calculation of Performance Level (PL) which is applied to a system with
SafetyOne. In this case SafetyOne can be used in a system for PL a to e in accordance with
ISO13849-1(2006).
Mean time to dangerous failure (MTTF
d
) Diagnostic Coverage (DC)
100 years 99% or more
・ In the case of using safety outputs as single channel outputs
The following table describes MTTF
d
and DC in the case of single channel outputs. They are
needed for the calculation of Performance Level (PL) which is applied to a system with
SafetyOne. In this case SafetyOne can be used in a system for PL a to d in accordance with
ISO13849-1(2006).
Mean time to dangerous failure (MTTF
d
) Diagnostic Coverage (DC)
100 years 90%