对单总线智能网络来说，如果串行总线地址30或31的输出不可用，设备输出转换到默认模式并保持上次输出的状态(可以通过设置改变)。对于双总线网络，串行总线地址31或30不可用，bsm会切换到另–条总线上。如果两条都不可用，设备输出转换到默认模式并保持上次输出的状态(可以通过设置改变)。
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