Allen-Bradley 1745-M1 Memory Module For SLC 500

The Allen-Bradley 1745-M1 EEPROM Memory Module is a compact, non-volatile memory accessory designed for use with SLC-100 and SLC-150 Programmable Logic Controllers in the Rockwell Automation SLC-500 family. As an EEPROM-based memory module, it provides persistent storage for controller contents, enabling safe backup and transfer of program data and configuration to compatible SLC systems. The 1745-M1 is catalogued as a memory option within the 1745-series and is frequently listed in Series B inventories, reflecting its continued availability as a legacy component. This module plugs into the SLC system to expand or replace resident memory, supporting straightforward integration with existing SLC-100/150 backplanes and processors. It is commonly used for memory expansion, preserving and migrating ladder logic and related data during maintenance or field replacements, and for quick recovery of PLC logic after power disruptions or hardware swaps. Designed and manufactured by Allen-Bradley (Rockwell Automation), the 1745-M1 remains a standard option for legacy installations where SLC-100/150 controllers are deployed, offering a straightforward approach to maintaining program integrity in aging plants.