SIEMENS 6ES7421-1BL01-0AA0

 分布式处理单元的冗余根据冗余度可以分为冗余度为1∶1和1∶n两种情况。这在每个DCS厂家的产品中是不同的。这两种方式各有优缺点。这里介绍的是冗余度为1∶1的冗余设置。

    分布处理单元冗余度为1∶1，就是将2块组态*一样的控制器设置成冗余方式。在投入运行时，若出现故障，两分布处理单元之间能实现无扰动切换，保证系统的正常运行。

    本系统所采用的分布处理单元均带3个网络接口，其中2个网口分别连接到A网和B网，实现各工作站点间的数据通信，第3个网口通过对等网数据连接子分布处理单元间（对等网数据现可选用光纤作传输介质），用来传输主、从分布处理单元之间的备份数据；分布处理单元之间的状态信息由串口传输。

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