IEC 61508/IEC 61511 does not mandate any certification The standard only tells about verification, validation and assessment- A process through which sufficiently independent qualified entities can attest that the claimed functions of a product, system or organizations are performed at a verifiable level of dependability.
Certification makes us believe that claim made by the manufacturer is true
What a Safety Certificate Should Contain?
a) Manufacturer and Certified Products
b) Main Standard Applied
c) Level of Safety Achieved
d) Corresponding Report to the Certificate and Safety Manual
Report to the Certificate:
a) How and What has been certified?
b) Any Restriction Apply?