Description
要有必需的后备手段：重要的保护和联锁，出了有通讯连接外，还必须具有硬接线方式；对重要的调节设备，除了在操作员站上有软手操外，还必须有后备手操，以便在DCS控制系统控制器或I/O模件发生故障时，仍然可以对重要设备进行及时干预。
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