Catalogs > Safety Products Catalog > Principles, Standards and Implementation > Introduction to Functional Safety of Control Systems
Introduction to Functional Safety of Control Systems
Table 8 shows the relationship (in terms of probability of dangerous failure between PL and SIL when applied to typical circuit structures.
| PL (Performance Level) | PFHD (Probability of Dangerous Failure per Hour) | SIL |
| a | ³10–5 to <10–4 | None |
| b | ³3 x 10–6 to <10–5 | 1 |
| c | ³10–6 to <3 x 10–6 | 1 |
| d | ³10–7 to <10–6 | 2 |
| e | ³10–8 to <10–7 | 3 |
| Table 8: Approximate correspondence between PL and SIL | ||
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Table 8 is for general guidance and must NOT be used for conversion purposes. The full requirements of the standards must be taken into account. |