Allen-Bradley 1746-BAS SLC 500 Basic Module

Allen-Bradley 1746-BAS SLC 500 Basic Module is a dedicated BASIC language interpreter card for the SLC 500 family that runs user‑created BASIC programs inside a legacy automation system. It plugs into an SLC 500 chassis to perform data collection, simple control logic, and device communications using on‑board BASIC code. The module provides two serial communications ports supporting RS‑232/423, RS‑422, and RS‑485 networks, along with a DH‑485 interface to the SLC processor for direct PLC communication. It includes 24 KB of battery‑backed RAM to store programs and runtime data, enabling persistence between power cycles. Electrical and environmental specs include backplane current draw of 150 mA at 5 V DC and 40 mA at 24 V DC; operating temperature 0 to 60 C, storage temperature -40 to 85 C, and humidity tolerance of 5 to 95% non‑condensing, suitable for many industrial environments. Catalog number 1746‑BAS identifies this BASIC module within the SLC 500 ecosystem and it is widely referenced in manuals and product listings as the SLC BASIC Module used with SLC 500 processors such as the 5/01, 5/02, or 5/03 series to incorporate custom BASIC programs into legacy control systems.