描述
现场控制器可实现控制器1：1冗余，主从PS之间可无扰切换。每个PS上都有两个 Ethernet网卡，第一网卡用于连接系统网络(DigiNetS)，而第二网卡之间则可彼此互连以形成专门的 冗余通讯链接(DigiNetR)，确保主从PS间的信息同步。一但主PS故障，从PS能迅速无扰地接替工 作。所有输入输出也支持冗余操作。
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