在DCS系统中，采用了许多提高可靠性的技术措施。这些技术措施是建立在以下四种基本思想上的：① 使系统本身不易发生故障，即所谓的故障预防;② 在系统发生故障时尽可能减少故障所造成的影响，即所谓的故障保安和故障弱化;③ 当系统发生故障时，能够让系统继续运行，即所谓的故障容错;④ 当系统发生故障时，可以在不停止系统运行的情况下进行维修，即所谓的在线维修。基于这四种基本思想，DCS系统中采用了各种各样的可靠性措施降低事故的发生及所造成的损失。

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