The 1772-SD2 Remote I/O Scanner series A Online data as follows: The 1772-SD2 Remote I/O Scanner/Distribution Panel is a compact, single board, stand-alone unit. It enables the Allen-Bradley PLC-2, PLC-2/20 and PLC-2/30 processors to communicate with up to 1792 I/O points (896 inputs and 896 outputs). The 1772-SD2 scanner/distribution panel may be connected directly for all remote I/O, or up to two local I/O chassis may be connected between it and the processor chassis. Eight LED lights indicate rack status and 2 channels are provided on the I/O rack. The functions of the remote I/O scanner/distribution panel are: Gather input data from remote I/O adapter modules and send this data to the PLC-2, PLC-2/20 and PLC-2/30 processor which uses it to update the input image table. This unit receive output data from the output image table of the PLC2, PLC-2/20 and PLC-2/30 processor and distribute this data to remote I/O adapter modules, thereby updating the status of the output signals. No original box, parts is new from a new pulled from a master distribution panel that was never completed. Sold as-is inventory #27