Allen-Bradley 1747-SN PLC Remote I/O Scanner Module

The Allen-Bradley 1747-SN PLC Remote I/O Scanner Module enables a central PLC to manage communication with distributed I/O racks, typically used in legacy SLC 500 and PLC-5 systems to scan remote I/O and interface distributed sensors and actuators with the controller. Key technical specs include the DH-485 remote I/O protocol up to 115.2 kbaud, backplane mounting in a 1747 rack, status LEDs for run, error, and communication, and mounting options on DIN rail or via a PLC rack, with power supplied through the PLC backplane. This module is compatible with SLC 500 and PLC-5 processors with appropriate firmware and supports 1794 FLEX I/O (with scanner support) for expanded I/O networks. Common replacements include the Allen-Bradley 1785-DN2 (Data Highway Plus interface) and 1794-SCNR2 (FLEX I/O scanner), or Ethernet/IP-based remote I/O modules.