數位儀控系統已廣泛應用於工業控制，利用數位電腦之通訊及自我診斷等優勢，可配置成多重容錯架構，在電子組件故障或受環境因素造成單機失效時，能以多數決之方式，維持控制器之設計功能。本文說明國際間著名之三重容錯控制器設計概念，並介紹國內發展三重容錯控制器之進程。

Digital instrumentation and control (DI&C) systems have been applied in industry widely. Taking the advantages of communication and self-diagnostic capabilities of digital equipments, they can be confi gured as a redundant control system to maintain application’s design function by voting mechanism when single equipment malfunction occurs owing to environmental effect or component failure. This paper presents designs of several triple modular redundant (TMR) controllers used worldwide and the development of a TMR controller by domestic effort.