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SIL certification

Product introduction: SIL certification is based on IEC 61508 (GB/T 20438), IEC 61511 (GB/T 21109), IEC 61513, IEC 13849-1, IEC 62061, IEC 61800-5-2 and other standards, the safety integrity level of safety equipment (SIL) or Performance Level (PL) for evaluation and validation of a third party evaluation, verification and certification. Functional safety certification mainly involves document management (FSM) evaluation for the development process of safety equipment, hardware reliability calculation and evaluation, software evaluation, environmental testing, EMC electromagnetic compatibility testing, etc.IEC 61508:Functional safety of electrical/electronic/programmable electronic safety-related systemsThe IEC61508 standard specifies the basic safety requirements for both normal system operation and fault prediction capability. These requirements cover general safety management systems, specific product design, and process design to comply with safety requirements, with the goal of avoiding both systematic design failures and random hardware failures.The main objectives of the IEC61508 standard are:· A systematic approach to providing safety oversight within the scope of the life cycle of all safety-related system components, including software and hardware;provide a method for determining the safety functional requirements of safety-related systems; · Establish basic standards that can be directly applied to all industrial fields. At the same time, it can also guide standards in other fields to make the drafting of these standards consistent (such as basic concepts, technical terms, requirements for specified safety functions, etc.);· Encourage operators and maintenance departments to use computer-based technologies;· Establish a conceptually unified, harmonized standard architecture and system.IEC61511:Functional safety requirements for safety instrumented systems in the process industryIEC61511 is a functional safety standard for safety instrumented systems in the process industry. It is a professional field standard launched by the International Electrotechnical Commission following the functional safety basic standard IEC61508. The domestic coordination standard of IEC61511 is GB/T 21109. In the process industry, instrumentation safety systems are used to perform instrumentation safety functions, and the IEC61511 standard addresses the question of what level of safety integrity and performance the instrumentation should achieve.For the validation of safety-related plant safety functions, the SIL level is the globally accepted method of defining safety integrity. For the process control industry, the relevant international standards mainly include the IEC 61508 standard (basic basis for the design and operation of safety instrumented systems), the IEC 61511 standard mainly focuses on systems for process control applications, and the IEC 61511 standard for plant designers and according to IEC 61508 standard to complete the design.ISO13849-1:Safety of machinery - Safety-related parts of control systems - Part 1: General principles for designThe new ISO13849-1 standard will be officially implemented at the end of 2011, which will be a new milestone in the field of mechanical functional safety. In the past, the certainty of the system is required, and some evaluations of the probability of system failure are added, so that a comprehensive safety evaluation can be carried out from components to systems. At the same time, the standard also provides designers with more quantifiable design implementation methods, such as increased system safety level (PLr), system mean time between dangerous failures (MTTFd), system diagnostic detection range (DC), common cause Fault prevention (CCF) and other parameters, thus effectively solving the problem that the original EN954-1 standard cannot achieve quantitative judgment of system safety.The new ISO13849-1 standard provides more effective security assessment solutions for some new control methods. It can improve the safety level of machinery and equipment with increasingly complex control systems, ensure production safety and high efficiency, and combine new technologies and design experience to help enterprises improve overall efficiency, productivity and flexibility, ensuring continuous production, Reduce unplanned downtime and lower development, operations and maintenance costs. Implementing this standard as soon as possible can ensure that machinery manufacturers seize market opportunities in the fierce competition.IEC62061:Safety of machinery - functional safety of safety-related electrical, electronic and programmable electronic control systemsBoth the IEC/EN 62061 and EN ISO 13849-1:2008 standards cover safety-related electrical control systems. With both standards, the same level of safety performance and safety integrity can be achieved. Each standard takes a different approach, but each is appropriate for its respective reader. EN ISO 13849-1:2008 gives a limited situation in Table 1 of its explanatory part. When using complex programmable technology, the highest PL performance level should be defined as PLd.In order to be able to employ complex safety functions that can be performed by previously unconventional system architectures, the IEC/EN 62061 standard provides corresponding methods. The EN ISO 13849-1:2008 standard also provides a corresponding approach in order to provide a more direct and simpler path required to perform more traditional safety functions with traditional system structures. An important difference between the two standards is that they apply to different technical fields. The IEC/EN 62061 standard is limited to the field of electrical systems. The EN ISO 13849-1:2008 standard applies to starting, hydraulic, mechanical and electrical systems. The main defined parameters are PFH, MTTF, DC, SFF, etc.IEC61326-3-2:Electrical equipment for measurement, control and laboratory use. Requirements for electromagnetic compatibility (EMC): safety-related systems and for performing safety-related functions (functional safety)The IEC 61326-3-1 and IEC 61326-3-2 standards have been published, which specify additional requirements for the level of immunity of safety-related equipment, including extreme cases with a very low probability that may occur in any location. The test simulates severe electromagnetic phenomena in the working state of the equipment, such as transient pulses that simulate the transient state of digital circuits or digital signal transmission. In order to increase the confidence of the electromagnetic immunity of the Safety Integrity Level (SIL), a higher number of pulses or a longer test time and a higher test level should be applied during the performance test against electromagnetic phenomena compared to the basic standard. For example, for SIL3 equipment, the electrical fast transient test level is 4kV, and the test duration should be 5 times the time specified in the basic standard.ISO26262:Road Vehicle System Design Functional SafetyThe ISO 26262 standard was developed to give people a better understanding of safety-related functions and to explain them as clearly as possible. ISO 26262 is derived from IEC61508, the basic standard for functional safety of electronic, electrical and programmable devices. International standards for functional safety of automotive electronics and electrical products. Once this standard was put forward, it was highly valued by major automobile manufacturers and auto parts suppliers, and actively promoted the implementation of this standard in product development.Based on the IEC 61508 standard, the ISO 26262 standard defines the safety of use of electrical and electronic systems. A major difficulty in vehicle design is how to pre-assess potential hazards and risks and take appropriate measures to reduce these risks. To facilitate this process, ISO stipulates that a 'hazard and risk analysis' must be carried out at the beginning of development work.The automotive industry uses high-performance electronic devices for vehicle safety control. The ISO 26262 functional safety standard jointly formulated and recognized by world-renowned major automobile manufacturers is to regulate the design requirements of electronic parts, software and hardware products for vehicles. With the promulgation and implementation of ISO 26262, the possible risks of vehicles and the degree of harm when accidents occur can also be reduced in the future, thus enabling the domestic vehicle industry to enhance the adaptability and competitiveness of the international future.IEC61800-5-2:Standard for adjustable speed electrical equipment - Part 5-2: Functional safety requirementsIEC61800-5-2 defines the safety functions of integrated safety drives, which defines a series of stop functions (Stop), namely:· Safe Torque Off / Safe Interruption Torque (STO- Safe Torque Off);· Safety Stop 1/SS1(Safety Stop1)/Safety Stop 2/SS2(Safety Stop2)· Safety Operation HaltIEC61800-5-2 also defines some monitoring functions. These monitoring functions include: acceleration safety limit; step safety limit; movement direction safety limit; speed safety limit; torque/force safety limit; position safety limit; motor temperature safety limit .The IEC61800-5-2 standard mainly proposes functional safety requirements for systems such as safety encoders, safety decoders, AC servo systems, servo drives, and servo motors. For example, a motor controller that meets the technical requirements of functional safety will support safety functions such as Safe Torque Off (STO) and Safe Stop 1 (SS1) to prevent unintended starts, and the product design must meet the requirements in the EN 61800-5-2 standard . The IEC61800-5-2 standard has been transformed into a national standard, the standard number is GB/T 12668.5.2, and the domestic counterpart standard committee is the National Power Electronics Standardization Technical Committee Speed Regulation Electric Drive System Semiconductor Power Converter Sub-Technical Committee (TC60 /SC1).EN50156IEC 61784-3:Measurement and control of digital data communication Part 3 Industrial network functional safety profileThe standard mainly defines the following:1. Implement the basic principles of IEC 61508 requirements for safety-related data communications, including potential erroneous transmissions, countermeasures and regulations affecting data integrity2. Common content implemented by various technologies3. Independent description of functional safety profiles for various communication profile clusters4. Several security communication layers are specified as part of the communication service profile in IEC61784-1 and IEC61158 series standards.EN50126Railway Applications: Reliability, Availability, Maintainability and Safety (RAMS) Specifications and InstructionsThis standard defines the RAMS (reliability, availability, maintainability and safety) of the system, namely reliability, availability, maintainability and safety, and specifies the management and requirements for RAMS at various stages in the safety life cycle. RAMS serves as a system service An important feature of quality measurement is obtained through design concepts and technical methods at various stages in the entire system safety life cycle.EN50128Railway applications: software for railway control and protection systemsThe software of railway control and protection system is divided into safety integrity level (SIL), and corresponding standards are formulated for different safety requirements. , test specifications, software structure, software design and development, software inspection and testing, software and hardware integration, software validation evaluation, quality assurance, life cycle, documentation, etc. put forward the corresponding specifications and requirements for the development of corresponding procedures.EN50129Railway applications: safety-related electronic systemsFor safety management, the concept of safety life cycle proposed by IEC61508 is introduced, that is to say, for the safety part of safety-related systems, the design is carried out according to this step, and the whole process of safety assessment and verification is required, in order to further reduce safety-related Human error, thereby reducing the risk of system failure.
Project introduction: The SIL technical standard was first promulgated and formulated by the International Electrotechnical Commission (IEC) and implemented under the jurisdiction of IEC/TC65. The National Standardization Technical Committee of SIL technology is the Standardization Technical Committee of 'National Process Industry Measurement Control and Automation' (SAC/TC124), and the secretariat unit is the Institute of Comprehensive Technology and Economics of Machinery Industry Instrumentation.
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SIL certification
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SIL certification is based on IEC 61508 (GB/T 20438), IEC 61511 (GB/T 21109), IEC 61513, IEC 13849-1, IEC 62061, IEC 61800-5-2 and other standards, the safety integrity level of safety equipment (SIL) or Performance Level (PL) for evaluation and validation of a third party evaluation, verification and certification. Functional safety certification mainly involves document management (FSM) evaluation for the development process of safety equipment, hardware reliability calculation and evaluation, software evaluation, environmental testing, EMC electromagnetic compatibility testing, etc.

IEC 61508:

Functional safety of electrical/electronic/programmable electronic safety-related systems

The IEC61508 standard specifies the basic safety requirements for both normal system operation and fault prediction capability. These requirements cover general safety management systems, specific product design, and process design to comply with safety requirements, with the goal of avoiding both systematic design failures and random hardware failures.

The main objectives of the IEC61508 standard are:

· A systematic approach to providing safety oversight within the scope of the life cycle of all safety-related system components, including software and hardware;

provide a method for determining the safety functional requirements of safety-related systems;

 · Establish basic standards that can be directly applied to all industrial fields. At the same time, it can also guide standards in other fields to make the drafting of these standards consistent (such as basic concepts, technical terms, requirements for specified safety functions, etc.);

· Encourage operators and maintenance departments to use computer-based technologies;

· Establish a conceptually unified, harmonized standard architecture and system.

IEC61511:

Functional safety requirements for safety instrumented systems in the process industry

IEC61511 is a functional safety standard for safety instrumented systems in the process industry. It is a professional field standard launched by the International Electrotechnical Commission following the functional safety basic standard IEC61508. The domestic coordination standard of IEC61511 is GB/T 21109. In the process industry, instrumentation safety systems are used to perform instrumentation safety functions, and the IEC61511 standard addresses the question of what level of safety integrity and performance the instrumentation should achieve.

For the validation of safety-related plant safety functions, the SIL level is the globally accepted method of defining safety integrity. For the process control industry, the relevant international standards mainly include the IEC 61508 standard (basic basis for the design and operation of safety instrumented systems), the IEC 61511 standard mainly focuses on systems for process control applications, and the IEC 61511 standard for plant designers and according to IEC 61508 standard to complete the design.

ISO13849-1:

Safety of machinery - Safety-related parts of control systems - Part 1: General principles for design

The new ISO13849-1 standard will be officially implemented at the end of 2011, which will be a new milestone in the field of mechanical functional safety. In the past, the certainty of the system is required, and some evaluations of the probability of system failure are added, so that a comprehensive safety evaluation can be carried out from components to systems. At the same time, the standard also provides designers with more quantifiable design implementation methods, such as increased system safety level (PLr), system mean time between dangerous failures (MTTFd), system diagnostic detection range (DC), common cause Fault prevention (CCF) and other parameters, thus effectively solving the problem that the original EN954-1 standard cannot achieve quantitative judgment of system safety.

The new ISO13849-1 standard provides more effective security assessment solutions for some new control methods. It can improve the safety level of machinery and equipment with increasingly complex control systems, ensure production safety and high efficiency, and combine new technologies and design experience to help enterprises improve overall efficiency, productivity and flexibility, ensuring continuous production, Reduce unplanned downtime and lower development, operations and maintenance costs. Implementing this standard as soon as possible can ensure that machinery manufacturers seize market opportunities in the fierce competition.

IEC62061:

Safety of machinery - functional safety of safety-related electrical, electronic and programmable electronic control systems

Both the IEC/EN 62061 and EN ISO 13849-1:2008 standards cover safety-related electrical control systems. With both standards, the same level of safety performance and safety integrity can be achieved. Each standard takes a different approach, but each is appropriate for its respective reader. EN ISO 13849-1:2008 gives a limited situation in Table 1 of its explanatory part. When using complex programmable technology, the highest PL performance level should be defined as PLd.

In order to be able to employ complex safety functions that can be performed by previously unconventional system architectures, the IEC/EN 62061 standard provides corresponding methods. The EN ISO 13849-1:2008 standard also provides a corresponding approach in order to provide a more direct and simpler path required to perform more traditional safety functions with traditional system structures. An important difference between the two standards is that they apply to different technical fields. The IEC/EN 62061 standard is limited to the field of electrical systems. The EN ISO 13849-1:2008 standard applies to starting, hydraulic, mechanical and electrical systems. The main defined parameters are PFH, MTTF, DC, SFF, etc.

IEC61326-3-2:

Electrical equipment for measurement, control and laboratory use. Requirements for electromagnetic compatibility (EMC): safety-related systems and for performing safety-related functions (functional safety)

The IEC 61326-3-1 and IEC 61326-3-2 standards have been published, which specify additional requirements for the level of immunity of safety-related equipment, including extreme cases with a very low probability that may occur in any location. The test simulates severe electromagnetic phenomena in the working state of the equipment, such as transient pulses that simulate the transient state of digital circuits or digital signal transmission. In order to increase the confidence of the electromagnetic immunity of the Safety Integrity Level (SIL), a higher number of pulses or a longer test time and a higher test level should be applied during the performance test against electromagnetic phenomena compared to the basic standard. For example, for SIL3 equipment, the electrical fast transient test level is 4kV, and the test duration should be 5 times the time specified in the basic standard.

ISO26262:

Road Vehicle System Design Functional Safety

The ISO 26262 standard was developed to give people a better understanding of safety-related functions and to explain them as clearly as possible. ISO 26262 is derived from IEC61508, the basic standard for functional safety of electronic, electrical and programmable devices. International standards for functional safety of automotive electronics and electrical products. Once this standard was put forward, it was highly valued by major automobile manufacturers and auto parts suppliers, and actively promoted the implementation of this standard in product development.

Based on the IEC 61508 standard, the ISO 26262 standard defines the safety of use of electrical and electronic systems. A major difficulty in vehicle design is how to pre-assess potential hazards and risks and take appropriate measures to reduce these risks. To facilitate this process, ISO stipulates that a 'hazard and risk analysis' must be carried out at the beginning of development work.

The automotive industry uses high-performance electronic devices for vehicle safety control. The ISO 26262 functional safety standard jointly formulated and recognized by world-renowned major automobile manufacturers is to regulate the design requirements of electronic parts, software and hardware products for vehicles. With the promulgation and implementation of ISO 26262, the possible risks of vehicles and the degree of harm when accidents occur can also be reduced in the future, thus enabling the domestic vehicle industry to enhance the adaptability and competitiveness of the international future.

IEC61800-5-2:

Standard for adjustable speed electrical equipment - Part 5-2: Functional safety requirements

IEC61800-5-2 defines the safety functions of integrated safety drives, which defines a series of stop functions (Stop), namely:

· Safe Torque Off / Safe Interruption Torque (STO- Safe Torque Off);

· Safety Stop 1/SS1(Safety Stop1)/Safety Stop 2/SS2(Safety Stop2)

· Safety Operation Halt

IEC61800-5-2 also defines some monitoring functions. These monitoring functions include: acceleration safety limit; step safety limit; movement direction safety limit; speed safety limit; torque/force safety limit; position safety limit; motor temperature safety limit .

The IEC61800-5-2 standard mainly proposes functional safety requirements for systems such as safety encoders, safety decoders, AC servo systems, servo drives, and servo motors. For example, a motor controller that meets the technical requirements of functional safety will support safety functions such as Safe Torque Off (STO) and Safe Stop 1 (SS1) to prevent unintended starts, and the product design must meet the requirements in the EN 61800-5-2 standard . The IEC61800-5-2 standard has been transformed into a national standard, the standard number is GB/T 12668.5.2, and the domestic counterpart standard committee is the National Power Electronics Standardization Technical Committee Speed Regulation Electric Drive System Semiconductor Power Converter Sub-Technical Committee (TC60 /SC1).

EN50156

IEC 61784-3:

Measurement and control of digital data communication Part 3 Industrial network functional safety profile

The standard mainly defines the following:

1. Implement the basic principles of IEC 61508 requirements for safety-related data communications, including potential erroneous transmissions, countermeasures and regulations affecting data integrity

2. Common content implemented by various technologies

3. Independent description of functional safety profiles for various communication profile clusters

4. Several security communication layers are specified as part of the communication service profile in IEC61784-1 and IEC61158 series standards.

EN50126

Railway Applications: Reliability, Availability, Maintainability and Safety (RAMS) Specifications and Instructions

This standard defines the RAMS (reliability, availability, maintainability and safety) of the system, namely reliability, availability, maintainability and safety, and specifies the management and requirements for RAMS at various stages in the safety life cycle. RAMS serves as a system service An important feature of quality measurement is obtained through design concepts and technical methods at various stages in the entire system safety life cycle.

EN50128

Railway applications: software for railway control and protection systems

The software of railway control and protection system is divided into safety integrity level (SIL), and corresponding standards are formulated for different safety requirements. , test specifications, software structure, software design and development, software inspection and testing, software and hardware integration, software validation evaluation, quality assurance, life cycle, documentation, etc. put forward the corresponding specifications and requirements for the development of corresponding procedures.

EN50129

Railway applications: safety-related electronic systems

For safety management, the concept of safety life cycle proposed by IEC61508 is introduced, that is to say, for the safety part of safety-related systems, the design is carried out according to this step, and the whole process of safety assessment and verification is required, in order to further reduce safety-related Human error, thereby reducing the risk of system failure.

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