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PLC remote I/O units are used for the inputs and outputs that are not in the electrical room, including all of the controls and lamps in the operator's cabin. This significantly reduces the number of control cables and intermediate terminations. Each remote I/O unit is connected to the Master PLC by a high speed serial link. A monitoring function in each unit de-energizes all of the control outputs in the event of a fault. This includes the loss of the data highway from the master PLC.

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