Signal machine SIL safety level compliance standard

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What are the two main aspects that the SIL certification primarily examines?
The product itself, as well as the conformity of the hardware and software functions 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 focal point of our examination is the quality management system employed during the development process, the qualifications of the R&D staff, and the overall organizational structure, ensuring that the methods used and document systems adhered to throughout the product development process meet the relevant standards.
Through these two aspects of examination, we can say that from the entire company to the research and development process, and finally to the formation of specific certified products, a complete closed loop has been formed, ensuring the reliable and safe realization of the product's safety functions.

SIL certification, also known as Functional Safety Certification, focuses on the safety functions of a product. Obtaining SIL certification is to verify whether these safety functions can be reliably and safely implemented.
For instance, with a lighting fixture, we are concerned with its lighting function, whether its light intensity can reliably and safely meet our requirements.

The standard for SIL Safety Integrity Level certification primarily includes:
1. IEC 61508—Establishes fundamental safety requirements for both normal system operation and fault prediction capabilities. These requirements encompass general safety management systems, specific product design, and process design to meet safety requirements, aiming to prevent both systematic design failures and random hardware failures.
2. IEC61511 - A functional safety standard specifically for safety instrumented systems in the process industry, which is a domain standard introduced by the International Electrotechnical Commission (IEC) following the foundational functional safety standard IEC61508. In China, the harmonized standard for IEC61511 is GB/T 21109.
3. ISO 13849-1—Comprehensive safety assessment from components to the entire system. Additionally, this standard offers designers more quantifiable design implementation methods.
4. IEC62061 - Standard in the electrical system field.
5. IEC61326-3-2 – Specifies additional requirements for the immunity levels of safety-related equipment, including low-probability end-of-site occurrences.
6. ISO 26262 – Primarily focused on specific electrical devices, electronic equipment, and programmable electronic devices in the automotive industry, designed for automotive applications, aiming to enhance the functional safety of automotive electronics and electrical products.

Safety Integrity Level, abbreviated as SIL, is differentiated by the probability of dangerous failure occurring per hour.
There are four SIL levels specified 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 defined.
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.
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, IEC 61800-5-2, etc., assessing and confirming the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment. Functional Safety Certification primarily involves evaluating the documentation management (FSM) process for the development 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, encompassing both product and system levels, with SIL4 having the highest requirements.