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1概述安康水电厂计算机监控系统采用一种适当集中的分层分布式系统结构．整个系统由主控层（上位机）和现地控制层（LCU）构成．上位机选用国产小型机双机系统，当主机故障时，自动切换到备用机．LCU是由五台可编程控制器组成·该控制器为双CPU结构，有两种编程语言，并配有智
1 Overview Ankang Hydropower Plant computer monitoring system uses a properly centralized hierarchical distributed system structure. The whole system consists of the main control layer (PC) and the local control layer (LCU). PC use domestic minicomputer double machine system, when the host fails, automatically switch to the standby machine. The LCU consists of five programmable controllers. The controller is a dual CPU architecture with two programming languages,