The Allen-Bradley Remote I/O (RIO) Scanner, 1747-SN, is the remote I/O scanner for the SLC 500. It enables communication between an SLC processor (SLC 5/02 or later) and remotely located 1746 I/O chassis and other RIO compatible Allen-Bradley operator interface and control devices.
The 1747-SN Scanner communicates with remotely located devices using the Allen-Bradley Remote I/O link. The RIO link consists of a single master (scanner) and multiple slaves (adapters). Communication between devices occurs over twisted pair cable with the devices daisy-chained together. The scanner can reside in any slot of the local SLC chassis except for slot 0.