The 1746-BAS Module is part of the Allen-Bradley SLC 500 family of programmable logic controllers (PLCs) and is typically used with SLC 500 processors. It allows the SLC 500 processor to communicate with other devices on the ControlNet network, such as I/O modules, drives, and other Controllers.

ControlNet is a high-speed industrial network protocol used primarily for real-time control and distributed I/O applications. The 1746-BAS module acts as a scanner on a ControlNet network. It scans the network and communicates with other ControlNet devices such as I/O modules, programmable logic controllers (PLCs), and other network scanners.

The 1746-BAS module provides interface capability for up to 64 nodes on a ControlNet network and supports a variety of data types and data transfer methods. It allows for distributed control and data exchange between different devices on the network.