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1-Channel Relay Module for SCC—The SCC‑RLY01 is a single-channel relay module for switching external devices. It contains one single‑pole double‑throw (SPDT) relay that is controlled by a digital line on a multifunction I/O device or module. To use the SCC‑RLY01, you must also have a multifunction I/O device or module, an appropriate cable, and the SCC‑68 or SCC‑2345 carrier.