Safety Parameters
The following parameters allow for Performance Level (PL) and Safety Integrity Level (SIL) applications:
ƛ DU single channel = 3.02 x 10-6 (1/h)
MTTFd = 1/3.02 x 10-6 (1/h) = 331,125 hours = 37.7 years
(MTTFd ≃ MTBFd)
Probabilistic Properties
|
Emergency stop switch |
Enabling switch |
|
|---|---|---|
|
Annual average number of operations |
12,000 cycles/year |
48,000 cycles/year |
|
Working days per year |
240 days/year |
240 days/year |
|
Working hours per day |
16 h/day |
16 h/day |
|
Working hours per year |
3,840 h/year |
3,840 h/year |
|
Resulting cycle period |
1,152 seconds (19.2 minutes) |
288 seconds (4.8 minutes) |