The part number "1747-SN" refers to a module manufactured by Allen-Bradley, which is a brand of Rockwell Automation. Specifically, the 1747-SN is a standard controlnet scanner module used in the Allen-Bradley SLC 500 series of programmable logic controllers (PLCs).
	This module allows the SLC 500 PLC to communicate with other devices on a ControlNet network.
	ControlNet is a high-speed industrial communication network commonly used in automation and control systems.

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