Electromagnetic fields and functional safety \Focus on IFA s work No. 0212\ IFA

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Specifications	Electromagnetic fields and functional safety \Focus on IFA s work No. 0212\ IFA
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Problem In recent years, electronic and programmable electronic systems have increasingly replaced the traditional safety dev

Specifications	Electromagnetic fields and functional safety \Focus on IFA s work No. 0212\ IFA
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Content	Problem In recent years, electronic and programmable electronic systems have increasingly replaced the traditional safety devices, generally employing contacts, on plant and machinery. Worker protec- tion systems employing wireless transmission technology (radio frequency identification (RFID)) are increasingly being used. They have the ad- vantage of greater flexibility for adaptation to changing tasks; at the same time, however, they are more sensitive to electromagnetic disturb- ances. Disturbances are caused for example by switching transients in industrial plant, lighting strikes, mobile phones, and discharges of static electricity from persons coming into contact with a component. In the absence of supplementary measures, noise voltage impulses on lines or magnetic or electro- magnetic fields may interfere with the function of these systems. In a worst-case scenario, the safety function may be impaired by electromag- netic disturbance. The resulting hazards must be taken into consideration at an early stage during development, testing and assessment. Safety devices employing electronic and programmable electronic systems must continue to fulfil their safety-related functions even under unusual elec- tromagnetic conditions. A proposal had therefore to be drawn up for an enhanced immunity level for safety devices. Enhanced disturbance level Activities In the German Electrotechnical Committee within DIN and VDE, a joint proposal was drawn up by representatives of German industry, the Deutsche Bahn (DB) and the IFA for an enhanced immunity level for industrial devices with safety functions. This proposal has been discussed at international level by the International Electrotechnical Com- mission (IEC) and was published in January 2008 in the form of the IEC 61326-3-1 standard. The IFA is involved in current standards projects for EMC relating to functional safety (IEC 61000-6-7, IEC 61000-1-2, EN 13309-2, ISO 13766-2). Electromagnetic fields and functional safety 0212 Edition 2/2013 617.0-IFA:638.25
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