Allen-Bradley 1756-M2 is a 1 MB memory expansion module for ControlLogix systems, designed to extend the memory available on the 1756 backplane. The module installs in a ControlLogix chassis to add an additional 1 MB of user memory for programs, data, and tag databases, enabling larger logic and more complex automation tasks. Compatibility is documented with 1756-L1 family controllers (including L1, L1M1, L1M2, L1M3) and with the Logix5550 platform, according to retailer listings of this part.
