What is the difference between IEC 61508 and IEC 62061?

When it comes to ensuring safety in industrial systems, compliance with international standards is crucial. Two widely recognized standards in the field of functional safety are IEC 61508 and IEC 62061. While both standards aim to minimize risks and hazards in a similar manner, they differ in their scope and application. In this article, we will explore the main differences between IEC 61508 and IEC 62061 and highlight their respective strengths.

IEC 61508: General standard for functional safety

IEC 61508 is a comprehensive standard that provides general guidelines for achieving functional safety in electrical, electronic, and programmable electronic systems (E/E/PE). It covers a broad range of industries, including process control, manufacturing, and energy. The standard follows a risk-based approach, emphasizing the reduction of risks associated with system failures.

The key components of IEC 61508 include the determination of safety integrity levels (SILs) and the implementation of safety lifecycle processes. SILs define the level of risk reduction required for a specific safety function, while safety lifecycle processes ensure the proper management of functional safety throughout the life cycle of a system.

IEC 62061: Safety of machinery - Functional safety of electrical, electronic, and programmable electronic control systems

IEC 62061 focuses specifically on functional safety in machinery. This standard provides guidance for the design and implementation of safety-related control systems to ensure the safe operation of machinery in various industries such as construction, transportation, and mining. Compared to IEC 61508, IEC 62061 offers more specific requirements tailored to the unique needs and challenges of machinery applications.

One notable difference between IEC 62061 and IEC 61508 is the use of performance levels (PLs) instead of safety integrity levels (SILs). Performance levels classify the reliability and performance of safety-related control systems based on defined risk reduction targets. The standard also emphasizes the importance of functional safety management throughout the different phases of machinery life cycles.

Conclusion

While both IEC 61508 and IEC 62061 address functional safety, they differ in their scope and focus. IEC 61508 provides a general framework for functional safety across various industries, while IEC 62061 specifically targets safety in machinery applications. The choice between the two standards depends on the nature of the system or machinery being designed and the regulations that govern the specific industry.

Compliance with these internationally recognized standards not only ensures the safety of personnel and equipment but also enhances trust and confidence in the products and systems being developed. By following the guidelines outlined in IEC 61508 and IEC 62061, manufacturers and designers can create safer and more reliable industrial systems and machinery, mitigating potential risks and improving overall operational efficiency.