当备用单元上电后，如果没检测到首要单元，备用单元会等待30秒以便首要单元上电。如果在30秒内首要单元没有上电完成，备用单元会认为首要单元不存在。在这种情况下，如果备用单元被设置成启动模式，它就会成为没有备份单元的激活单元来运行。
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