Allen-Bradley 1746-SN I SLC 500 Scanner Module

The Allen-Bradley 1746-SN I SLC 500 Scanner Module is a Remote I/O Scanner that links an SLC 500 processor to distributed I/O racks in typical SLC 500 installations. Catalog number 1746-SN, it serves as the scanner component within a Remote I/O (RIO) configuration in the SLC 500 family and manages the communication protocol between the controller and remote I/O devices. By handling data transfer for inputs and outputs across remote racks, the module enables a scalable I/O topology without routing every device directly to the central processor. Typical applications include manufacturing lines, packaging lines, and process-control configurations where sensors, actuators, and other I/O are spread across multiple racks and need centralized control via a single SLC 500 controller. The 1746-SN is installed alongside other 1746-series I/O modules on the SLC backplane and participates in the standard RIO communication scheme used by SLC 500 systems to coordinate device addressing, data words, and I/O updates across the distributed network.