Safety Input Module Safety Data
Attribute | Point Operation Type | |
|---|---|---|
Single Channel | Dual Channel (at controller instruction) | |
Total Failure Rate (λ (safety related)) | 3.93497E-06 | 3.98296E-06 |
Safe Failure Fraction (SFF) | 99.997% | 99.997% |
Safe Failure Rate (λ S ) | 1.96748E-06 | 1.99148E-06 |
Diagnostic Coverage (DC) | 99.993% | 99.994% |
Safe Detected Failure Rate (λ SD ) | 1.96736E-06 | 1.99136E-06 |
Safe Undetected Failure Rate (λ SU ) | 1.28515E-10 | 1.23271E-10 |
Dangerous Failure Rate (λ D ) | 1.96748E-06 | 1.99148E-06 |
Dangerous Detected Failure Rate (λ DD ) | 1.96736E-06 | 1.99136E-06 |
Dangerous Undetected Failure Rate (λ DU ) | 1.28515E-10 | 1.23271E-10 |
Diagnostic Test Interval (DTI) (hours) | 8 | 8 |
Hardware Fault Tolerance (HFT) | 0 | 1 |
Spurious Trip Rate (STR) | 3.949E-06 | 4.118E-06 |
Mean Time to Failure, Spurious (MTTF-spurious), (hours) | 253259 | 242837 |
PFH (1/hours) | 1.285E-10 | 1.233E-10 |
PFD avg , at Mission Time of 20 years | 1.126E-05 | 1.080E-05 |
Safety Reaction Time (SRT), (millisecond) If RPI changes, SRT (ms) = (RPI - 2) + 7 ms | 7 @ RPI of 2 ms | 7 @ RPI of 2 ms |
Mean Time to Fail Dangerous (MTTF D ) =
1/λD Mean Time to Repair (MTTR) is 8 Hours = DTI
IMPORTANT:
Faulty module is non-repairable and must be replaced with
a new module within MTTR. | ||
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