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ADVANCED MANUFACTURING NOW Derek Jones


a T


he movement toward a single global machine-safety stan- dard has been a long time coming—and now it’s going to be a little longer.


The merger of safety standards ISO 13849 and IEC 62061 into one standard, IEC/ISO 17305, was scheduled to take effect in 2017. However, the project was cancelled, at least for now, based on decisions made at the October 2015 plenary meeting of ISO technical committee ISO/TC 199. With signifi cant discrepancies between the ISO and IEC stan-


dards, the committee couldn’t reconcile the differences by their deadline. As a result, IEC/ISO 17305 is stopped, and its future won’t be known until after the next IEC/TC 44 and ISO/TC 199 plenary meetings in October 2016 and March 2017, respectively. Despite this setback of the proposed merger, machine de- signers can still expect to see changes to global machine-safety standards in the coming years. Any eventual re-implementation of the merger would repre- sent another step in the evolution of safety standards. But even without that, the evolution will continue in the form of further up- dates and continued convergence of ISO 13849 and IEC 62061. The two standards have similarities, but also distinctions. ISO 13849 is primarily used for conventional machines, including those used in discrete production where only a simple, self-contained design and validation methodology is required. IEC 62061 is typically used for more complicated machines that require more complex safety functions, such as those used in process applications.


The transition to the two standards was a signifi cant leap for many machine designers. Switching from simple machine-safety categories to performance level (PL) and safety integrity level (SIL) models brought greater complexity. It’s also resulted in con- fusion about when SIL-qualifi ed components can be used in PL- qualifi ed systems, or vice versa, and created training demands to help ensure engineers understand both standards. The value these two standards have brought to safety-com- pliance is undeniable. The standards’ support of new, program- mable safety technologies helps end users meet requirements and enhance productivity. They also provide a simplifi ed means to achieve safety compliance in markets around the world.


14 AdvancedManufacturing.org | September 2016


Safety Business Development Manager Rockwell Automation


MODERN MANUFACTURING PROCESSES, SOLUTIONS & STRATEGIES What’s Next for Global Machine Safety?


A company that’s capitalized on IEC 62061 and ISO 13849 is Paper Converting Machine Co. (PCMC; Green Bay, WI). This leader in tissue converting, packaging, fl exographic printing and nonwoven technology uses the standards to make safety a key part of its design process and equipment upgrades. “It’s really a change in philosophy,” said Jill Thiede, strategic accounts manager for PCMC. “Now, we can design an integrat- ed safety system that reduces machine hazards and associated risks—and improves overall effi ciency and productivity.” For example, it can use zone control to divide a complex converting line into areas that correspond to specifi c risks or hazards. The system can be confi gured to remove power from one zone so a maintenance technician can service it, while keep- ing the rest of the line running.


If IEC/ISO 17305 does come to pass, it will likely encounter


resistance as any standards change does. However, machine designers should fi nd migration to and understanding of current standards will make future migration more manageable. Those concerned with understanding the relationship be- tween the two standards and potential areas of convergence can start by studying the ISO TR 23849 or IEC/TR 62061-1 technical reports. They provide helpful interpretations of each standard and offer guidance on specifi c applications. As far as potential changes for ISO 13849, machine design- ers may get some relief from the quantifi cation burdens required for more simple and deterministic systems. IEC 62061 may include additions that address new factors, such as low-demand safety applications, to cover a wider range of machinery. Even as these changes are made, basic requirements of the


standards will stay the same. That’s why it’s important to commit to understanding and making the most of current standards. This is especially true for safety professionals who are respon- sible for maintaining their organizations’ corporate standards. Those who commit to understanding existing standards will be better prepared to develop higher-performing and interna- tionally competitive machinery, while also containing costs of multinational safety compliance. They’ll also be better positioned in the future to migrate to revised standards – and eventually to a potential single converged standard, if it happens.


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