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SIL Certification Level Pre-Assessment Submission Document List
Product Instructions
2. Product Safety Feature 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 models)
7. Product Design Documents (drawings, material reports, calculations, etc.)
8. Additional Documents

What is the failure rate of SIL certification?
The concept of equipment failure rate is often mentioned during the SIL certification process, and it 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 failure rate?
Firstly, to understand failure rate, we must grasp 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 the 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 expectation. 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 layman's terms, let's compare it to a lighting system. If the lighting system doesn't light up or doesn't light up as per our set requirements, it's considered to be 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.
Understood what failure is, one can then categorize the types of failure. Within the concept of functional safety, failures can be divided into two main categories based on their cause of occurrence: 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 product's failure rate by analyzing the theoretical model of the product and using 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.

As the public awareness of industrial accidents and their impact on society grows, more and more companies recognize 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 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 built upon 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.

What two aspects does the SIL certification mainly focus on?
The conformity of the product itself, as well as the hardware and software functionalities of the intended certified product, to the requirements of IEC61508 or more detailed functional safety standards within the industry, such as hardware failure rates and failure modes.
Another key focus of our evaluation is the quality management system employed during the development process, the qualifications of the R&D personnel, and the overall organizational structure, ensuring that the methods used and document systems followed throughout the product development meet relevant standards requirements.
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 the reliable and safe realization of the product's safety functions.
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, 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 assessments of document management (FSM) for the development process of safety equipment, hardware reliability calculations and evaluations, software assessments, 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.