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What is the failure rate for 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. It can be said that without determining the failure rate, the SIL certification is incomplete and inadequate. So, what exactly is the concept of the failure rate?
Firstly, to understand failure rate, we need to grasp what failure means. According to GB/T 20438.4, which is also defined by IEC 61508, failure is "the termination of the ability of a functional unit to perform a required function, or the operation of the functional unit in a non-required manner." A more intuitive way to understand this is: normally, y = f(x), but upon failure, it becomes y ≠ f(x), where f() represents the function we pre-set, and y stands for our safety expectations. This also explains why the word "function" is used for both functions and functions in English.
This statement might be too formal and not easily understood by the general public. So, speaking in more colloquial terms, it's like a lighting system. If the lighting system doesn't light up or doesn't do so as per our set requirements, it's considered faulty.
So said, everyone may know that when a product doesn't function according to our specified requirements, we can say it has failed. Then, what is the probability of this failure? That's the failure rate.
After understanding what failure is, we can start to classify the types of failure. In the concept of functional safety, failures can be divided into two main categories based on their causes: 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 aim to determine the failure rate of the product by analyzing its theoretical model and using empirical data from its market sales, thereby integrating it with other parts of the SIL certification to form a comprehensive system, ensuring the reliable and safe execution of safety functions.

Safety Integrity Level (SIL), also known as SIL, is differentiated by the probability of hazardous failure occurring per hour.
There are four SIL levels defined in the international IEC standards, with SIL 4 indicating high integrity and SIL 1 indicating low. For each safety integrity level, design specifications that can reduce design errors are stipulated.
The safety level required in the production process is assessed and determined by a specialized production technology company. Generally, processes with high safety requirements need a safety level of SIL 3.

The significance of obtaining SIL certification for products
1. SIL Certification's Impact on Product Accumulation:
We guarantee the accuracy of the product's specific functions.
(2) Enhances the industry's acceptance and recognition of the product.
(3) Certified products offer enhanced safety, boosting the product's competitiveness.
(4) Customers typically believe: Certified = Recognized = The.
2. The cumulative impact of SIL certification on the enterprise:
(1) Enhance the company's safety experience and level.
(3) The R&D process of the company is more standardized and verifiable.
(4) Enhanced safety guarantees are in place during the occurrence of injuries.
(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 quality and safety are also recognized, enhancing the company's market competitiveness while greatly bolstering customer confidence in the product. Therefore, it is necessary to obtain SIL certification for a product that significantly impacts life and property safety.

SIL Certification Level Pre-Assessment Submission Document List
Product User Manual
2. Product Safety Feature List
3. Product Safety Manual
4. Failure Mode and Effects Analysis (FMEDA) Excel File
5. Quality Management System Certificate (ISO 9001)
6. Product Photos (including front and side views of representative models)
7. Product Design Documents (drawings, material reports, calculation sheets, etc.)
8. Additional Information
SIL certification is a third-party evaluation, 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, and IEC 61800-5-2, assessing and confirming the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment. Functional safety certification primarily involves the assessment of documentation 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 being the most stringent.