IEC 62061 – Functional Safety for Machinery Systems

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Chapter 13: IEC 62061 – Functional Safety for Machinery Systems

Chapters

IEC 62061 – Functional Safety for Machinery Systems

This article explains IEC 62061, its role in machinery functional safety, and how manufacturers can apply the standard to manage risks, meet safety requirements, and support compliance throughout the machinery lifecycle.

What Is IEC 62061?

IEC 62061 is the machinery-sector application of IEC 61508. It offers a structured approach to the functional safety of machinery control systems: assigning each safety function a required Safety Integrity Level (SIL), then designing, verifying, and validating the system that performs it. The current edition was published in 2021 and, unlike the first edition, covers non-electrical technologies such as hydraulics and pneumatics. By addressing the entire safety lifecycle, IEC 62061 enables manufacturers to design, implement, and maintain safety systems that align with modern operational and compliance goals.

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How IEC 62061 Works

IEC 62061 follows the same logic as IEC 61508, adapted for machinery: 

  • Risk assessment: Hazards are identified and risks evaluated using ISO 12100. Where a control system is relied on to reduce a risk, that becomes a safety function. 
  • SIL assignment: Each safety function is assigned a required SIL (SIL 1 to SIL 3), typically using the method in Annex A, which combines the severity of harm with the frequency and duration of exposure, the probability of the hazardous event, and the possibility of avoiding it. 
  • Safety requirements specification: Each safety function’s requirements, including its required SIL, are specified before design begins. 
  • Design: The safety function is broken into subsystems, typically sensing, logic, and output. Each subsystem’s architecture, diagnostic coverage, and systematic capability limit the SIL it can support, and the combined probability of dangerous failure per hour (PFH) must fall within the target band for the required SIL.
  • Verification and validation: The design is verified against the specification, and the complete safety function is validated before the machine enters service. 

IEC 62061 assumes safety functions operate in high-demand or continuous mode, so it uses PFH rather than the PFDavg measure that IEC 61508 applies to low-demand systems. It does not define SIL 4. 

IEC 62061 or ISO 13849? 

Both standards are harmonized in the EU, and either can be used to show conformity. Teams often choose ISO 13849 for simpler safety functions built from standard components, and IEC 62061 for complex or programmable systems, or where they already work to IEC 61508. The 2021 edition of IEC 62061 lets designers use subsystems developed to ISO 13849: PL e corresponds to SIL 3, PL d to SIL 2, and PL b and PL c to SIL 1. 

Integrating Safety Into Machinery Systems

Adopting IEC 62061 offers manufacturers a roadmap for enhancing the safety and reliability of their machinery systems. Key aspects of integration include the following. 

Compatibility With ISO 13849 

IEC 62061 lets designers combine subsystems developed to ISO 13849, rated by Performance Level (PL), into a safety function rated by Safety Integrity Level (SIL). Teams can reuse proven components and subsystems across both frameworks. 

Comprehensive Safety Lifecycle Planning 

By following IEC 62061’s guidelines, manufacturers can develop robust safety lifecycle plans that integrate risk assessment, system design, validation, and ongoing monitoring. This structured approach ensures that safety is embedded in every stage of machinery operation. 

Optimized Machinery Design 

Incorporating IEC 62061 enables manufacturers to design machinery systems that prioritize both safety and operational efficiency. The standard’s emphasis on systematic analysis and testing ensures reliable performance under varied conditions. 

Key Benefits of IEC 62061

IEC 62061 stands out for its adaptability, making it applicable to a wide range of machinery systems and industries. 

Enhanced Flexibility 

The standard allows manufacturers to tailor its principles to meet specific operational and industry requirements. For instance, in semiconductor manufacturing, IEC 62061 helps ensure that high-precision equipment operates reliably under stringent safety protocols. 

Improved Risk Management 

IEC 62061 works alongside the ISO 12100 risk assessment, turning each risk that a control system must reduce into a safety function with a clear, measurable integrity target. 

Compliance and Market Access 

IEC 62061 is harmonized in the EU, so meeting it gives a presumption of conformity with the relevant requirements of machinery law. Those requirements move from the Machinery Directive (2006/42/EC) to the Machinery Regulation (EU) 2023/1230 on 20 January 2027. 

Lifecycle Efficiency 

By integrating safety principles from the design phase through to operation and decommissioning, IEC 62061 reduces lifecycle costs while maintaining high safety standards. 

RELATED READING: The Complete Guide for Functional Safety in Industrial Manufacturing

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Practical Applications of IEC 62061

IEC 62061’s structured approach makes it particularly valuable in complex and high-risk environments. Examples of its practical applications include the following. 

Automotive Manufacturing 

IEC 62061 helps automotive manufacturers meet functional safety requirements for robotic assembly lines while maintaining productivity. Automated welding, painting, and assembly robots can be safely integrated into production lines using IEC 62061’s principles, reducing downtime and preventing accidents. Robot cells must also meet ISO 10218. 

Semiconductor Industry 

IEC 62061 supports the safe operation of precision machinery critical to chip manufacturing processes used in semiconductor development. It helps ensure that equipment such as lithography machines and wafer handlers function reliably while protecting workers and maintaining strict process controls. 

Industrial Equipment 

IEC 62061 provides a framework for developing safe, reliable machinery used in factories and processing plants. This includes machinery like conveyors, mixers, and packaging systems, where operational safety and compliance are critical to avoiding production disruptions. 

Energy Sector 

IEC 62061 helps address functional safety risks associated with machinery used in the energy sector, including compressors, pumps, and handling equipment. Plant-level safety instrumented systems in power generation and oil and gas usually fall under IEC 61511 or IEC 61508 instead. 

Food and Beverage Industry 

IEC 62061 helps food and beverage manufacturers address functional safety risks associated with high-speed processing and packaging equipment. By applying IEC 62061, manufacturers can ensure that machinery operates efficiently while safeguarding operators from potential hazards such as moving blades, high-speed conveyors, and automated sealing heads, where guard interlocks and stop functions are typical safety functions. 

Pharmaceutical Manufacturing 

IEC 62061 ensures that machinery used for production, filling, and sealing protects the people who operate it. IEC 62061 addresses operator safety; product quality and cleanliness are governed separately by GMP requirements. 

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Strengthen Machinery Safety With IEC 62061

IEC 62061 provides a robust framework for achieving functional safety in machinery systems, applying IEC 61508 to machinery and complementing ISO 13849. Its adaptable and comprehensive approach empowers manufacturers to design and operate safer, more efficient machinery. By integrating risk assessment, lifecycle planning, and validation, IEC 62061 not only enhances safety but also optimizes operational performance and compliance. 

Managing functional safety under IEC 62061 requires clear requirements, traceability, and verification throughout the machinery development lifecycle. Jama Connect® helps engineering teams connect these activities, assess the impact of changes, and maintain the evidence needed to support safety and compliance. 

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This article was authored by Patrick Garman and published on October 22, 2026. 

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DEFINITION OF IEC 62061:

IEC 62061 is the international standard for the functional safety of machinery control systems. It applies the principles of IEC 61508 to machinery, rating each safety function with a Safety Integrity Level from SIL 1 to SIL 3.

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