What is the difference between 13849 and 62061?

In the field of safety engineering, two important standards are often referred to: ISO 13849 and IEC 62061. These standards are designed to ensure the safety and reliability of machines and systems. While they have similar goals, there are several key differences between them.

Scope and Application

One major difference lies in the scope and application of ISO 13849 and IEC 62061. ISO 13849 primarily focuses on the safety of control systems used in machinery. It provides a comprehensive framework for evaluating the safety performance of these systems, including their design, configuration, and integration into a machine. On the other hand, IEC 62061 is more specific to electrical, electronic, and programmable electronic systems. It addresses the safety aspects related to the use of these systems in industrial processes.

Risk Assessment Approach

Another significant difference between the two standards is the approach to risk assessment. ISO 13849 follows a qualitative approach, where risks are evaluated using categories and performance levels. It assesses the probability of failure of safety-related parts within a system and assigns them a performance level ranging from PL a to PL e. In contrast, IEC 62061 adopts a quantitative approach, which involves calculating the probability of failure of safety functions based on data and statistical analysis. It uses the concept of Safety Integrity Levels (SIL) to quantify the required level of safety of a system.

Validation and Verification

When it comes to validation and verification, ISO 13849 and IEC 62061 also differ in their requirements. ISO 13849 requires that the safety performance of a control system be validated by testing or other appropriate means. This validation process ensures that the system meets the specified performance level. On the other hand, IEC 62061 places more emphasis on a thorough verification process. It requires detailed documentation and analysis to demonstrate that the safety requirements have been met, including proof of component selection, architectural design, and functional safety assessment.

In conclusion, while both ISO 13849 and IEC 62061 aim to ensure the safety and reliability of machines and systems, they have distinct differences in scope, risk assessment approach, and validation requirements. Understanding these differences is essential for engineers and designers involved in the development and implementation of safety measures in industrial processes.