Description
增加一个环节也就意味着增加了故障发生的可能。信阳一期、益阳一期的DCS是由Bailey公司提供的INFI-90系统，针对其系统结构采用了公用环，公用系统的控制全部通过公用环配置来实现。2套DCS通过Tagnumber来实现控制，这样较好地解决了耦合问题。这种控制方式的优点是配置较少，外部设备也不用增加，有效地利用了信息资源；缺点是公用环的设备不能停电检修，除非2台机组均停机检修，加重了设备运行安全性的要求。
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