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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Safety relay ： ウィキペディア英語版 Safety relay Safety relays are devices that generally implement safety functions.〔(Safety Compendium, Chapter 4 Safe control technology, p. 115 )〕 == History == Relays and contactors used to control plant and machinery in the early days of control technology. In the event of a hazardous situation, the actuator was simply isolated from the energy supply. This type of protection system could be manipulated in the event of a malfunction, disabling the protective function. Special relay circuits, such as the three-contactor combination, were the first designs to come out of deliberations into how this could be avoided. These device combinations led to the development of the first safety relay from the German automation manufacturer Pilz, the PNOZ.〔(Patent specification Emergency stop relay )〕〔(Safety Compendium, Chapter 4, Safe control technology p. 115 )〕〔Practical Machinery Safety (Google eBook), David Macdonald, Newnes, 16.07.2004, Chapter 5: Emergency-stop monitoring and the safety relay, p. 112 et sqq.〕〔(Safety relays PNOZ )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Safety relay」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.