关键词：可编程逻辑控制器（PLC）；分布式控制系统（DCS系统）；多重冗余系统
摘 要：This paper considers shortening of the control period for high-reliable distributed control systems. It also provides experimental results. We have proposed distributed control systems which utilize multiplexed control programs without adding any redundant controllers. The proposed systems achieve much higher reliability than conventional full duplex systems. Simulations of reliability analyses have been carried out and reliability of the proposed systems have been verified. The control logics in the controllers are compensated by each other by using a majority decision process instead of error detecting. Experimental results show that the system is functional even if one of the controllers fails in a distributed control system.