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SIL Certification Level Pre-Assessment Submission Document Checklist
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 Certificate (ISO9001)
6. Product Photos (including front and side views of representative model)
7. Product Design Documents (drawings, material reports, calculations, etc.)
8. Additional Information

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 industry production, 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 companies fully leverage their excellent engineering practices and safety technologies (IEC61508 and IEC61511) to prevent industrial accidents from recurring. This is because these experiences and technologies are based on a wealth of practical experience 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.

The significance of obtaining SIL certification for products
1. The impact of SIL certification on the product:
(1) Ensures the accuracy of product's specific functions.
(2) Enhances product acceptance and recognition within the industry.
(3) Certified products enjoy higher safety, enhancing their competitiveness.
(4) Customers typically believe: Certified = Acknowledged = The.
2. The cumulative impact of SIL certification on enterprises:
Enhance corporate safety experience and proficiency.
(3) The R&D process of the company is more standardized and verifiable.
(4) Enhanced safety measures are in place at the time of injury occurrence.
(5) Throughout the certification process, ensure the company maintains a high level of research and development.
If a project, system, or product achieves SIL certification, its product quality and safety are also recognized, enhancing the company's market competitiveness while significantly boosting customer confidence in the product. Therefore, SIL certification is necessary for a product that significantly impacts life and property safety.

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. One could say that without determining the failure rate, the SIL certification is incomplete and inadequate. So, what exactly is the concept of 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 stands for our safety expectations. This also explains why "function" is the same word for both function and function in English.
This statement might be too formal and not easily understood by the general public. So, let's use colloquial language for a comparison. Imagine a lighting system; if it doesn't light up or doesn't do so as per our set requirements, it's considered malfunctioning.
So said, you might know that when a product doesn't function according to our specified requirements, we can say it's failed. Then, what's the probability of this failure? That's the failure rate.
After understanding what a failure is, one can start categorizing types of failures. In the concept of functional safety, failures can be divided into two main categories based on their cause of generation: systematic failure and random hardware failure. Among them, random hardware failure is quantifiable. The calculation process of PFDavg is based on probabilistic analysis of random hardware failure.
In the SIL certification, we aim to determine the failure rate of the product by analyzing its theoretical model and utilizing the empirical data from its market sales. This, combined with other parts of the SIL certification, forms a comprehensive system to ensure the reliable and safe execution of safety functions.
SIL certification is a third-party assessment, verification, and certification based on standards such as IEC 61508 (GB/T 20438), IEC 61511 (GB/T 21109), IEC 61513, IEC 13849-1, IEC 62061, and IEC 61800-5-2, which evaluate and confirm the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment. Functional safety certification primarily involves the assessment of document management (FSM) for the development process of safety equipment, hardware reliability calculations and assessments, software evaluation, environmental testing, and EMC electromagnetic compatibility testing. SIL certification is divided into four levels: SIL1, SIL2, SIL3, and SIL4, covering both product and system levels, with SIL4 having the highest requirements.