Control Design: While attending community college, our programmable logic controller (PLC) class took a field trip to a packaging plant. When looking in the controller cabinet, I noticed that the PLC’s power leads originated from a DeWalt 24 V cordless drill battery pack sitting in its charger. If power was lost, the PLC continued to run from the cordless drill battery for long enough to save its data and shut down, as opposed to just power off abruptly and lose critical data.
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