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Risk assessment must be established for reasonable operation of functional safety. So far, the relationships between the risk frequency, i.e., hazardous event rate, and the safety integrity of safety-related systems have not been clear for the general demand modes of operation. Then, the present paper describes the new formulations of hazardous event rate (HER) as well as the risk reduction ratio...
Safety standards have been applied to variety of field in society, and will be increasing in number and categories. Trend of international safety standards and organizational work for the standards are discussed and recent activities relating to IEC safety international standards of NECA (Nippon Electric Control Equipment Industries Association) are also reported.
Since the various industrial accidents have been occurring because of increasing of industrial production and complication of a production system, the demand to introduce the safety system is increasing greatly. In the light of the above background, development of new EMC standard for safety systems is advanced in IEC. This standard is intended to quantify occurrence probability of the dangerous condition...
This paper is the introduction on the substance of IEC 61511 and the activity to prepare its Japanese Industrial Standard by a working group in JEMIMA.
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