Posts Tagged ‘IEC 62061’

Wednesday, August 1, 2012 @ 05:08 PM gHale

By Christopher T.F. Hale
Over the past decade, functional safety has become increasingly important for the requirements of operating machinery.

Compliance to the basic functional safety standards, IEC 61508, EN/ISO 13849, and IEC 62061, are necessary to operate with optimum functional safety.

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“Functional safety has been around a while, but has been instantiated in the machinery directive in Europe as part of the new approach that has been around since 1892,” said Joseph Lender, senior functional safety engineer of TUV Rheinland North America during the Siemens-sponsored webinar “Functional Safety: A Discussion of Standards and the Machinery Directive”.

Functional safety is the detection of a potentially dangerous condition resulting in the activation of a protective or corrective device or mechanism to prevent hazardous events arising or providing mitigation to reduce the hazardous event.

The objective of functional safety is to reduce the risk of injury to people and to machinery, while still being able to produce product that meet necessary requirements and standards.

The webinar addressed topics and coordinated a discussion toward the Machinery Directive and the standards for Functional Safety.

The safety system standards described in the presentation were IEC 61508, EN/ISO 13849, and IEC 62061. The presentation focused more on the standards of functional safety, rather than the machinery directive, but still addressed a few topics dealing with the directive.

“What the machinery directive does is it establishes the essential requirements that are to be followed to generate machinery so it is not harmful to the environment,” Lender said.

Other areas addressed during the webinar included an introduction to functional safety of electric, electronic and programmable systems and understanding the safety philosophy of operating under the safety systems IEC 61508, EN/ISO 13849, and IEC 62061.

Click here to view the webinar in its entirety.

Wednesday, April 18, 2012 @ 02:04 PM gHale

By Gregory Hale
A successful safety profile is all about making quality risk assessments and the new ISO machine safety standard that is making the old EN 954-1 standard obsolete does that by increasing a manufacturer’s performance level.

“The standard provides a quantitative approach to risk assessment and safety validation,” said John D’Silva, marketing manager safety at Siemens during a webinar entitled “Transitioning to ISO 13849-1: Changes Required and Helpful Tools.”

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“This makes sure that safety is not solely a matter of component reliability, but also relies on common-sense safety principles such as redundancy, diversity and fail-safe behavior. Under this standard, the risk assessment for a given safety function will yield a performance level, this helps eliminate both over- and under-engineering, a costly or risky result of EN954-1’s limitations.”

“The new standard accommodates the advances in technologies and that is the main advantage,” D’Silva said. “Further it corrects deficiencies in EN 954-1.”

ISO 13849-1 Safety of machinery: Safety-related parts of control systems (SRP/CS) provides safety requirements and guidance on the principles for the design and integration of safety for control systems, including the design of software.

It specifies characteristics that include the performance level necessary to carrying out safety functions. It applies to SRP/CS, regardless of the type of technology and energy in place whether electrical, hydraulic, pneumatic, mechanical, or others and for all kinds of machinery.

The new standard addresses the dramatic changes in technology the older standard (EN 954-1) was incapable of handling, in particular, determining the safety of programmable products.

D’Silva, an integrated safety expert at Siemens, gave an outline on software-based tools that assist in achieving compliance to the standards. The tools are SISTEMA (Safety Integrity Software Tool for the Evaluation of Machine Applications) and SET (Safety Evaluation Tool).

The SISTEMA software utility provides developers and testers of safety-related machine controls with comprehensive support in the evaluation of safety via ISO 13849-1. It enables one to model the structure of the safety-related control components based upon the designated architectures, thereby permitting automated calculation of the reliability values with various levels of detail, including the Performance Level (PL). The SISTEMA program is now available.

SET for the IEC 62061 and ISO 13849-1 standards is a TÜV-tested online tool that supports the fast and reliable assessment of your machines’ safety functions. One can realize a standard-compliant report that serves as documentation as a proof of safety.

Safety is becoming even more important today than ever before and the new standard will help users move toward the main functions of safety and that is to protect workers, property and the surrounding area. In addition, there are the needs to reduce cost pressures and maintain productivity. With the push toward globalization, there is an increased need for production and one of the ways to meet that need is to lose the old way of doing things and integrate safety.

It is simple, reducing risk means systems remain running, which means a higher level of productivity and increased profitability. While that sounds simple, getting from Point A to the Point B is often fraught with challenges.

The new standard is one area that can help eliminate those challenges.

Key changes incorporated into EN ISO 13849-1 to address deficiencies in the previous standard and accommodate new technologies:
• Addresses the programmable electronic safety devices used increasingly in modern machines.
• Accommodates new technologies now commonly used in safety systems.
• Provides a quantitative approach to risk assessment and safety validation.
• PL’s quantify the required and achieved level of safety in probabilistic terms.
• Defines measures for diagnostic capability and common cause failures.
• Increases customer confidence in safety and integrity of their product.

Click on Safety Evaluation Tool or SISTEMA for more information on the tools.

Monday, April 16, 2012 @ 11:04 AM gHale

By Nicholas Sheble
“Nearly all process plant accidents are the result of some kind of human error,” said Todd Stauffer, “and it’s that error that certification aims to eliminate.”

Stauffer heads safety consultancy exida’s training and certification division. He talked about on the areas of human error that contributed to the safety incidents — process design, hazard and operability studies, operating procedures, training and human factors, and inspections during an exida webcast last week.

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“The only way to eliminate accidents is to have a competent person at the controls. How do you know a person is competent? Only by measuring their knowledge against a known standard, body of knowledge,” Stauffer said.

ISA – The International Society of Automation, TUV Rheinland North America | TÜV Rheinland, and exida are the Big Three of the safety certification and certificate-granting entities in North America and Europe. As well, South Asia, South America, and Asia are more closely toeing the safety line as world standards, ethics, and a deeper sense of social responsibility take root in the emerging markets. Thus, the market for safety standards and expertise is expanding.

Engineers at TÜV SÜD and exida developed the CFSE (Certified Functional Safety Expert) and CFSP (Certified Functional Safety Practitioners, a lighter version of the CFSE) concepts with the support of other international safety experts to ensure that personnel performing SIS (Safety Instrumented Systems) lifecycle activities are competent as the IEC (International Electrotechnical Commission) requires by its IEC 61508, 61511, and 62061 standards.

Exida administers the program and issues certificates. Some companies now require CFSE holders to oversee safety projects and CFSP holders to execute them. Exida said the CFSE program is the most stringent in the world and represents the best demonstration of safety competency in the world.

Stauffer also touched on exida’s new Specialty Badge program, which will offer training in specific areas of safety, electives in safety, and a new cyber-security program – the ICSSE (Industrial Control Systems Security Expert).

The latter certification will delve into the fundamentals, relationships, and distinct differences between ubiquitous IT (information technology) and the more esoteric ICS (industrial control systems). Networking basics and industrial networking will also be a part of this undertaking.
Nicholas Sheble (nsheble@isssource.com) is an engineering writer and technical editor in Raleigh, NC.

 
 
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