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SIL Certification Level Preliminary Assessment Submission Document List
Product User Manual
2. Product Safety Features Checklist
3. Product Safety Manual
4. Failure Mode and Effects Analysis (FMEDA) Excel File
5. Quality Management System Proof (ISO9001 Certificate)
6. Product Photos (including front and side views of representative models)
7. Product Design Documents (drawings, material reports, calculation sheets, etc.)
8. Additional Information

What is the failure rate of SIL certification?
During the SIL certification process, a concept we often refer to is the equipment failure rate, which is a core term in SIL certification. Essentially, without determining the failure rate, the SIL certification is incomplete and not comprehensive. So, what exactly is the concept of the failure rate?
Firstly, to understand failure rate, we must comprehend what is meant by "failure." According to GB/T 20438.4 and also the definition in IEC 61508, failure is "the termination of the ability of a functional unit to perform a required function, or the operation of a functional unit in a non-required manner." A more intuitive way to understand this is: normally, y=f(x), but after failure, it becomes y≠f(x), where f() represents the pre-set function, and y denotes our safety expectation. This also explains why "function" is the same word used for both functions and functions in English.
This statement might be too formal and not easily understood by the general public. So, let's put it in more colloquial terms, like comparing it to a lighting system. When a lighting system doesn't light up or doesn't do so as per our set requirements, it's considered to be faulty.
So said, everyone might know that when a product doesn't function according to our set requirements, we can say it's failed. Then, what's the probability of this failure? That's the failure rate.
Understanding what failure is, we can then classify the types of failure. In the concept of functional safety, failures can be divided into two main categories based on their generation cause: systematic failure and random hardware failure. Among them, random hardware failure is quantifiable. The calculation process of PFDavg is based on a probabilistic analysis of random hardware failure.
In the SIL certification, we analyze the product's theoretical model and market sales data to determine the failure rate, thereby integrating with other parts of the SIL certification to form a comprehensive system, ensuring the reliable and safe execution of safety functions.

As the widespread recognition of industrial accidents and their impact on society grows, more and more companies are realizing the importance of safety.
In modern process industries, due to the complexity of processes and the multitude of equipment, any failure can have severe consequences for employees, the public, equipment, or the environment.
The SIL certification process is about helping businesses fully utilize their good engineering practices and safety technologies (IEC61508 and IEC61511) to prevent the recurrence of industrial accidents. This is because these experiences and technologies are based on a wealth of actual experiences and lessons learned.
With the issuance of the IEC 61508 and IEC 61511 series standards, a systematic functional safety assessment and testing process can effectively address this issue.

What are the two main aspects that the SIL certification primarily evaluates?
The conformity of the product itself, as well as the hardware and software functionalities of the product to be certified, to the requirements of IEC61508 or more detailed industry-specific functional safety standards, such as hardware failure rates and failure modes.
Another focal point for us is the quality management system employed during the development process, including the qualifications of the R&D staff and the organizational structure, to ensure that the methods used and document systems followed throughout the product development meet relevant standards.
Through these two aspects of examination, we can say that from the entire company to the R&D process and finally to the specific certified products, a complete closed loop has been formed, ensuring that the product's safety features are reliably and safely implemented.
SIL certification is a third-party assessment, verification, and certification process based on standards such as IEC 61508 (GB/T 20438), IEC 61511 (GB/T 21109), IEC 61513, IEC 13849-1, IEC 62061, IEC 61800-5-2, etc., for evaluating and confirming the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment. Functional safety certification primarily involves assessments of document management (FSM) for the development process of safety equipment, hardware reliability calculations and evaluations, software evaluations, environmental testing, and EMC electromagnetic compatibility testing. SIL certification is divided into four levels: SIL1, SIL2, SIL3, and SIL4, encompassing both product and system levels, with SIL4 being the most stringent.