safety Integrity Level (SIL)

Safety Integrity Level (SIL) 

Safety Integrity Level is also known as SRS (Safety Related System).
A safety integrity level is an appropriate system. The safety integrity level reduces the risk of devices under control (EUC). Uses one or more safety systems to reduce risk.
Functional safety (FS) requires safety function and safety integrity
A safety integrity level covers all safety lifecycle activities. As SIL provides FS (Functional Safety), SIL specifies target levels of risk reduction, SIL measures SIF (Safety Instrumented Function).
A safety integrity level (SIL) is defined as the relative level of risk-reduction provided by a safety function or specifies a target level of risk reduction. As such, SIL is a measure of the performance required for the Safety Instrumented Function (SIF). In functional safety standards based on the IEC 61508 standard, four SILs are defined as SIL 4, SIL 3, SIL 2 and SIL 1, with SIL 4 being the most reliable and SIL 1 the lowest.
Several methods are used to assign SIL. These are often used in combination and may include
  • Risk matrix
  • Risk graph
  • Level of Protection Analysis (LOPA)

Comments