铁路服务之SIL（安全完整性等级）
Railway Business Services - SIL（Safety Integrity Level）
安全完整性等级(SIL)划分为SIL0，SIL1，SIL2，SIL3，SIL4共5个等级，其中每个等级对应一个具体的危险侧失效率数值。
Safety integrity level (SIL) is defined as a relative level of risk-reduction provided by a safety function, or to specify a target level of risk reduction. In simple terms, SIL is a measurement of performance required for a safety instrumented function (SIF).
随着轨道交通的迅速发展，安全越来越获得重视，SIL技术规范也越来越得到广泛的认可。
With the rapid development of railway，the importance of safety has been addressed ever since and SIL specifications has been recognized widely.
审核/评估和认证Audit, Assessment and Certification
●安全证明文件的评估（分别根据EN 5012x 系列和IEC 61508标准）
Assessment of safety documents ( according to EN 5012x series and IEC 61508 standards)
●用户手册，维护和维修指南的检查
Inspection of user manual, maintenance and repair guide
●安全管理审查/ 工厂审查
Safety management review / factory audit
●验证和测试
Verification and test
●产品功能确认
Validation of the product function
测试服务 Testing services
●根据环境安全、电磁兼容、电气安全、功能安全和安保要求进行产品测试
Conducting product tests based on environmental safety, electromagnetic compatibility, electrical safety, functional safety and security requirements