The fast development of automation and distributive intelligence has determined the raising of products furnished with electronic or programmable electronic Command and Control System.

When the correct functioning of a product inside a system allows to guarantee its safety, the Primary Safety is not enough.

Aside classical safety evaluation, SIL Functional Safety must be guaranteed.

The worldwide standard reference is IEC 61508, Functional Safety generic standard that disciplines the whole life circle of electrical, electronical and programmable electronical Systems (E / E / PE) and products.