With the interlock, "Probability of hazard" (Pr) reduced from Pr2 to Pr1 because the machine stops before the guard opens. New requirement: PL b. Over-design is okay.
In the world of industrial automation and machinery safety, few documents carry as much weight as ISO 12100 and IEC 62061 . For engineers, safety managers, and compliance officers, performing a risk assessment is not just a bureaucratic hurdle—it is a legal and moral imperative. However, traditional risk assessment methods can be complex, time-consuming, and prone to subjective error.
But what exactly is SIRAC? How does it simplify the rigorous IEC framework? And how can you use it to achieve compliance without losing your sanity? This article provides a deep dive into the SIRAC methodology, its parameters, and its practical application. The Simplified IEC Risk Assessment Calculator (SIRAC) is a structured, often spreadsheet-based or software-driven tool designed to perform risk assessments specifically aligned with IEC 62061 (Safety of machinery – Functional safety of safety-related control systems) and ISO 13849-1 . simplified iec risk assessment calculator sirac
A: That means the risk is negligible. However, you must still document that fact. You cannot simply ignore it. Part 10: Conclusion – The Future of SIRAC The Simplified IEC Risk Assessment Calculator is not a replacement for engineering judgment—it is a tool to structure that judgment. As Industry 4.0 and collaborative robots (cobots) become ubiquitous, risk assessment is shifting from static documents to dynamic, real-time evaluation.
Installed a safety-rated interlock switch (PL e) with a guard locking device that prevents the machine from restarting until the door is closed and locked. With the interlock, "Probability of hazard" (Pr) reduced
| Feature | SIRAC (IEC 62061) | ISO 13849-1 Graph | HRN / Matrix Methods | | :--- | :--- | :--- | :--- | | | Low (4 variables) | Medium (5 variables including training) | High (arithmetic scoring) | | Output | SIL / PLr | PLr | Risk Score (e.g., 12/25) | | Best For | Functional safety of control systems | Mechanical & pneumatic systems | General risk inventories | | Auditability | Excellent (clear logic) | Excellent | Poor (subjective numbers) |
A: Whenever the machine is modified (MOC – Management of Change) or every 5 years for general review. In the world of industrial automation and machinery
Enter the . This tool has emerged as a game-changer for small to medium-sized enterprises (SMEs) and busy automation professionals who need to balance thorough safety analysis with operational efficiency.