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When “One Blip” Is Enough to Stop a Plant In the DCS process control layer, a single power interruption can escalate from a brief disturbance to a full unit shutdown. I/O modules reset, controllers reboot, communication links re-establish, and what should have been a manageable disturbance becomes a production event. Most plants already specify dual supplies for the DCS: two independent DC sources, often backed by redundant rectifiers and batteries. The real challenge is how