Abstract

Reliability is required of the control function of an industrial machine. A design procedure is proposed from the pursuit of the contents of a design to the required. There is biorhythm in development of an international standard, it assumes that the peak is greeted about a control facility, and the design procedure considered to be needed from now on is reported. This proposal proposes STEP 1-3 as a design procedure. - STEP1 : Essential design (adoption of a safety margin) - STEP 2 : Protection design (TYPE Coordination of IEC 60947-4-1) - STEP 3 : Reliability engineering (a parallel redundancy system and an in-series system)

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