Allen-Bradley 1785-ME64 Memory Expansion Module

The Allen-Bradley 1785-ME64 EEPROM memory cartridge provides 64K words of non-volatile memory for PLC-5 controllers, enabling memory expansion and retention of the controller’s program and data contents. Designed for PLC-5/40 and PLC-5/60 processors, this removable memory module plugs into the PLC-5 memory expansion interface to back up or transfer memory contents between units. Catalog numbers include 1785-ME64 and 1785-ME64/A, with -A revision variants documented by vendors. The module is EEPROM-based and ships in a static-shielded bag to guard against electrostatic discharge. Typical usage includes archiving PLC programs, transferring configurations between machines, and providing portable memory storage for PLC-5 applications in industrial environments. Some listings note a weight around 70 g (about 2.5 oz) and operating/storage temperature ranges commonly cited by suppliers; exact specs may vary by revision. 1785-ME64/A is a revision seen on stock listings from multiple distributors.