There has been a lot of progress and change in the Safety Instrumented Systems field now in the past five years. The standard IEC 61508 was updated in the year 2010 (actually it took almost a year that is in year 2011 for the changed standard to percolate in the industry). This had a number of important changes as compared to the earlier version, such as evaluating whether the security of the SIS is OK, calculating the resultant safety integrity level of connected subsystems of different SIL rated devices in series and parallel combinations, introduction of the concept of No Part Failures and No Effect failures and so on.
Later on in 2016, the IEC 61511 standard (Part 1) was also updated. There were several changes including those related to the competency of personnel in the updated portion.
The best way of updating your own knowledge to be current with these new developments is to learn via e-learning courses such as those provided
by Abhisam, which also offer a free certification option for personnel
on passing their exam.
