例如,如果系统的看门狗计时器设置为200ms,智能总线的扫描周期为5ms,当首要单元的主机架掉电时,扩展单元中的智能总线控制器等待400ms的时间后停止更新智能设备的输出。再过15ms后,智能设备会使用备份单元中的数据作为输出。需要注意的是主机架中的所有智能控制器也会停止输出,因为主机架已经掉电。连接到此总线上的智能设备会在15ms内使用备份单元上的数据。
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