The Allen-Bradley 1746-BAS is an SLC BASIC Module designed for the Allen-Bradley SLC 500 Programmable Logic Controller (PLC) system. This versatile module features multiple communication interfaces, including RS-232/423, RS-422, RS-485, and DH-485 ports, allowing easy connection to modems, printers, Human Machine Interfaces (HMIs), and various external devices. The 1746-BAS module includes 24KB of battery-backed RAM for reliable data and user program storage, ensuring stable performance and program retention during power loss. Ideal for industrial automation and control applications, the Allen-Bradley 1746-BAS enhances system flexibility and communication capability within the SLC 500 PLC platform.