正是因为有了这些扩展性选项，才避免了不必要的冗余，而且采用更少的硬件即可满足过程控制需求，并且在大到小所有系统配置上均可使用类似的应用软件以容错性，大限度提高工厂可用性800xA 控制器和I/0的容错性，大限度地提高了控制系统的可用性，从而保障了生产和利润。对于这种高度的可用性而言
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