Modular TMR multiprocessor system

Abstract

A tri-module redundant (TMR) multiprocessor system for increased availability to a real-time application is presented. The system incorporates three homogeneous Z-80 based microcomputers, each with necessary analog/digital I/O facilities and global communication hardware. The software design is modular in nature and is, therefore, cost effective and adaptable for expansion to the N-module redundant (NMR) system. The retry mechanism has been employed for recovery from transient faults. The number of retries is programmable, which makes the system adaptable to an application environment. The system has been used to drive a mobile trolley.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>