Many companies have continued the CE certification model, focusing solely on design without implementing the safety requirements and lifecycle concept emphasized by IEC 61508. Many domestic suppliers and enterprises that design and produce safety devices have undergone CE certification before implementing SIL certification. Under the guidance of habitual thinking, some companies only think about seeking SIL certification from certification agencies after completing product design and even producing prototypes that can be mass-produced. This method is incorrect. At this stage, the hardware and software structures of the product have basically taken shape. If you find that you overlooked relevant security factors when planning the product's security requirements at the beginning, you will face a lot of reassessment and modification work, and may even need to overturn the original design and start over. CE certification is done after having a prototype, as CE certification requires a prototype to be present during testing. However, SIL certification requires the implementation of a lifecycle concept,SILauthenticationThe content not only includes the testing of prototypes, but also the evaluation of corresponding document management in the R&D process, which is referred to as FSM (Functional Safety Management) in standards such as IEC61508. SIL certification requires the involvement of certification bodies from the beginning to provide guidance and direction, in order to improve efficiency and reduce rework. That is to say, if the prototype has already been made before starting to prepare for certification, it is likely to be too late.

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