The Safety Evaluation Tool for IEC 62061 and ISO 13849-1 standards takes you directly to your goal. This TÜV-tested online tool supports the fast and reliable assessment of your machine’s safety functions. As a result, you’re provided with a standard-compliant report that can be integrated into documentation as proof of safety. Correct applications of IEC 62061 or ISO 13849-1 moves machine safety design towards essential safety; it provides a high degree of legal security and standard compliant documentation.
The TÜV-tested online tool guides the user step by step, from specification of the safety system structure to component selection, up to determination of the attained safety integrity level (SIL) or performance level (PL). As a result, users are provided with a standard compliant report that can be integrated into a product’s documentation as proof of safety. New functions in the Safety Evaluation Tool, version 2 (e.g., a safety related database for universal values) make the safety assessment even easier than before.
When starting a new project, a series of steps are followed: initially, the safety areas are analyzed and the safety functions specified. Then the subsystems are created and filled with data. After evaluation of the overall result, the final report is produced that contains clear status information.
Safety and Standards
The primary goal of safety is protection of people, a social responsibility. Additionally, directives and standards necessitate innovations for reducing cost pressures and maintaining productivity. The overarching drive is toward globalization and increased consumer demand, which is only possible with innovative engineering solutions that include safety.
ISO standards cover international requirements. In the United States, the standards are UL, ANSI, and NFPA; in Europe, the standards are IEC and EN. In Japan, the standard is JIS. In the U.S., the Department of Labor and OSHA are the governmental agencies involved in machine safety installation. Note that the laws of the country where a machine is being installed always apply to the machine installation.
The primary machine safety standards are ISO 13849-1 and IEC 62061. (ISO 13849-1 replaced EN 954-1 in 2012.) These standards apply the time element to safety systems for the machinery sector. For categories, ISO 13849-1 uses the term “Performance Level” (PL) and an alphabetical designate (PLa through PLe) to distinguish them. IEC 62061 builds on the structure of “hardware fault tolerance” and uses the term “Safety Integrity Level” (SIL) with three levels (1 through 3) applying to machines. A presumption of conformity occurs when applying the standards correctly—the corresponding directive (e.g., machinery) is considered to be complied with. The standards ISO 13849-1 and IEC 62061 are harmonized.
ISO 13849-1 is for mechanical engineering, electrical, and other items such as pneumatic and hydraulic components. IEC 62061 is for electrical and electronic safety engineering. In principal there is not much differences between the two standards. If no appropriate type C standard exists, an appropriate harmonized standard (e.g., ISO 13849-1 or IEC 62061) may be used to design a safety related control system.
The Safety Evaluation Tool
The two major tools for machine safety evaluation are SISTEMA and the Safety Evaluation Tool (SET). The German industry organization VDMA has created a technical document (66413) that describes the uniform data transfer between the different safety tools. An XML structure was designed whereby all manufacturers of safety products can easily and uniquely define their safety-related data to import into the various calculation tools.
SET is a free online tool (no installation necessary). Among its features:
- Documentation of results is available by simply printing out a report.
- Offers simple, same handling for both standards.
- Provides detailed configuration of safety functions (e.g., E-Stop, Fence).
- Uses pre-defined libraries.
- Optimally supports the use of Siemens products.
- Also supports third-party manufacturers.
The tool guides the user through the process of result report preparation in a targeted manner:
- Step one: Define the safety function: insert safety function, subsystems, or SRP/CS from libraries.
- Step two: Select the standard on which the calculations should be based: IEC 62061 or ISO 13849-1.
- Step three: Describe the safety function: layout of the safety function (detection> evaluation> actor) or combinations of safety functions (detection + evaluation > actor; detection > evaluation + reaction; detection + evaluation + reaction).
- Step four: Create a new project: create the subsystem or SRP/CS detection, evaluation, reaction. Data entry: product selection from the database.
- Step five: Create result and report.
Application of the standards and the use of certified products minimize expenditures and risks. Siemens Safety Integrated products are certified in accordance with the relevant manufacturer standards and can be comfortably called up in SET, together with manufacturer specifications.
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