Allen-Bradley 1745-M1 Memory Module

Allen-Bradley 1745-M1 EEPROM Memory Module is a non-volatile memory cartridge designed for the SLC-100 and SLC-150 PLC families. This Bulletin 1745 memory option provides up to 1,200 words of user program memory stored in EEPROM, enabling the PLC to retain the program without continuous power. The module plugs into the processor rack's memory module socket, serving as dedicated storage for the controller’s program and enabling straightforward program transfer or recovery between units. Because it uses EEPROM, there is no separate battery requirement, and data remains intact with power removed, making it suitable for CPU replacements or field recovery. Commonly used in legacy automation applications to back up or replicate the SLC-100/150 program, the 1745-M1 helps preserve critical control logic and supports field service workflows by simplifying restoration in the event of memory loss.